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22 mars 2011 2 22 /03 /mars /2011 22:12
1 - La surveillance de la radioactivité de l’air en France

Depuis le 12 mars 2011, le panache radioactif qui résulte des rejets des réacteurs nucléaires accidentés de la centrale de Fukushima se déplace, tout en se diluant, dans les courants atmosphériques de l’hémisphère nord. L’IRSN dispose d’une modélisation de cette dispersion, réalisée en collaboration avec Météo France, qui lui permet de suivre et d’anticiper ce déplacement.

 

Selon cette modélisation, le panache a recouvert dans la journée du vendredi 18 mars 2011 la plus grande partie de l’Amérique du Nord et le nord-est de la Sibérie. Il est passé ensuite sur l’Atlantique Nord et pourrait atteindre la France métropolitaine le 23 ou 24 mars 2011. 

 

Les concentrations attendues de césium 137 dans l’air sur les territoires balayés par le panache sont extrêmement faibles. Ce radionucléide est représentatif des matières radioactives rejetées à longue distance lors d’un accident nucléaire.

 

Ces concentrations seront d’un niveau trop faible pour être détectées par les 170 balises d’alerte du réseau Téléray de l’IRSN, dont les mesures sont également consultables sur le site internet de l’IRSN.

 

Accéder aux cartes des résultats de mesure de la radioactivité de l'air :

 

   - en France métropolitaine
   - à Saint-Pierre-et-Miquelon
   - à Tahiti
   - en Guyane
   - en Guadeloupe
   - en Martinique
   - à La Réunion
   - en Nouvelle-Calédonie

 

L’IRSN partage l’avis de l’Agence de l’Environnement des Etats-Unis (EPA), qui estime que ces concentrations seront sans conséquence sanitaire et environnementale. De plus, elles seront si minimes qu’elles ne pourront sans doute être détectées dans l’environnement que par des mesures d’échantillons effectuées dans des laboratoires spécialisés.

 

L’IRSN dispose de ce type de laboratoires en métropole (ainsi qu’à Tahiti, situé dans l’hémisphère sud et donc hors du flux principal de ce panache). L’Institut publiera les résultats d’analyse dès que disponible, c'est-à-dire plusieurs jours après le passage du panache. S’agissant de Saint-Pierre-et-Miquelon ou des Antilles, les résultats des données analysées aux Etats-Unis sont considérées comme représentatifs de la situation sur ces territoires. 

2 - Modélisation de la dispersion des rejets radioactifs dans l’atmosphère à l’échelle mondiale

 

A partir des rejets estimés par l’IRSN, Météo France a simulé la dispersion des rejets radioactifs à très grande distance, projetée jusqu’au 26 mars.


Visionner la simulation

 

Selon cette simulation, le panache radioactif aurait actuellement atteint le nord-est de la Sibérie, les Etats-Unis et l’ouest de l’atlantique. Il devrait atteindre la France à partir du 23 ou 24 mars.

 

Les concentrations attendues à terme, d’après cette modélisation, pourraient être de l’ordre de 0,001 Bq/m3 en France métropolitaine et dans les départements d’outre-mer de l’hémisphère nord. Comme attendu, l’hémisphère sud n’est pas significativement affecté par cette dispersion à grande échelle.

 

A titre de comparaison, les valeurs mesurées au cours des jours suivant l’accident de Tchernobyl étaient dépassaient 100 000 Bq/m3 dans les premiers kilomètres autour de la centrale ; elles étaient de l’ordre de 100 à 1000 Bq/m3 dans les pays les plus touchés par le panache radioactif (Ukraine, Biélorussie) ; en France, les valeurs mesurées dans l’Est étaient de l’ordre de 1 à 10 Bq/m3 (le 1er mai 1986). Aujourd’hui, une très faible activité de césium 137 subsiste dans l’air, de l’ordre de 0,000001 Bq/m3.

 

Pour estimer ces niveaux de contamination de l’air, l’IRSN a dû au préalable évaluer la quantité de radioactivité qui a pu être rejetée du 12 au 22 mars 2011 par les trois réacteurs accidentés.

En savoir plus

 

 

Des mesures de précaution sont-elles nécessaires?


Il n’y a aucune mesure à prendre lorsque les masses d’air en provenance du Japon arriveront au dessus de la France.

 

En effet, en l’état actuel, les retombées radioactives consécutives au passage des masses d’air en provenance du Japon devraient être 1000 à 10000 fois inférieures à ce qui a été observé en France après l’accident de Tchernobyl.

 

Ces retombées seront sans conséquence pour la santé des Français et pour l'environnement. Aucune précaution particulière n’est à prendre pour les adultes, femmes enceintes et les enfants : pas de restriction alimentaire, pas de prise d’iode stable, pas de mise à l’abri ou de confinement.

 

Nous attirons votre attention sur le fait que la prise d’iode stable doit se faire uniquement sur ordre du Préfet et qu’il est dangereux d’ingérer des comprimés d’iode stable lorsque la situation ne l’exige pas.


Et en cas de pluie ?


La présence de pluies peut augmenter les dépôts consécutifs au passage des masses d’air en provenance du Japon. Cependant, même en présence de pluies, les retombées seront très faibles et ne nécessitent pas de précautions particulières.

  


Les eaux de pluie feront l’objet de mesures par l’IRSN, sans qu’une contamination significative de ces eaux ne soit attendue.

Aucune contamination des nappes phréatiques n’est attendue en France.

 

 

3 - Comprendre

 

Foire aux questions thématiques

Afin de répondre le plus synthétiquement possible aux questions que vous vous posez, nous produisons des foires aux questions concernant le séisme au Japon et ses impacts sur les installations nucléaires.

Pour toute autre question, vous pouvez nous faire parvenir un mail via notre boite contact.

 

Télécharger la foire aux questions mise à jour le 21 mars (document pdf)

 

> Vous trouverez également une foire aux questions sur le site du Ministère de la Santé : Japon - Point sur les recommandations sanitaires. 

 

 

Informations générales sur les installations nucléaires et la surveillance de la radioactivité de l'environnement

 

Découvrez quelques dossiers d'informations de notre Base de connaissances :

L'organisation de la surveillance de la radioactivité de l’environnement en France
L'accident de Three Mile Island
L'accicent de Tchernobyl
Risque sismique et installations nucléaires

L’organisation de la sûreté nucléaire en France
L’échelle INES

 

Conséquences environnementales d'un rejet radioactif accidentel et voie d'exposition des personnes (document pdf)

 

 

Les alimentations électriques sur une centrale nucléaire française
Une centrale nucléaire produit de l’électricité. Néanmoins elle a besoin d’une alimentation électrique pour assurer son bon fonctionnement ainsi que l’ensemble des ses mesures de sureté. Mais qu’en est-il des centrales nucléaires françaises ?

Télécharger la fiche d'information au format PDF

 

La gestion d’un accident grave sur un réacteur à eau sous pression en France
Même si les accidents graves sont rares, des mesures sont prises afin de gérer leurs conséquences. Voici un descriptif succint des mesures prises en cas d’accident grave en France.

Télécharger la fiche d'information au format PDF

 

Source IRSN

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22 mars 2011 2 22 /03 /mars /2011 21:22

Deux journées de championnat, et déjà une trêve.

Avant que certains joueurs du championnat russe ne rejoignent leur sélection, notamment en vue des éliminatoires de l'Euro et de la CAN 2012, focus sur la deuxième journée.
Une journée qui a commencé ce samedi avec la victoire du FK Krasnodar sur le Spartak Naltchik (2-0), une victoire historique car étant la première du FK Krasnodar en Premier-Liga. Plus tard dans la journée, le Dynamo Moscou a obtenu sa première victoire de la saison en battant Rostov (3-1).
Dimanche, c'était au tour d'un autre promu, autre club de Krasnodar accessoirement, d'enter en scène. Le Kouban (c'est de lui qu'il s'agit) s'est imposé sur le terrain du Tom Tomsk (1-0) qui concède sa deuxième défaite en autant de matchs. Le Lokomotiv Moscou s'est quant à lui incliné sur le terrain de l'Amkar Perm (0-1) alors que le Roubine Kazan parvenait à venir à bout du Terek Grozny (2-0). Une victoire qui permet aux Tatars, champions en 2008 et 2009, de s'installer en tête. Grozny et Tomsk sont quant à eux les deux lanternes rouges et les seules équipes à avoir perdu leurs deux premiers matchs.
La journée se clôturait ce lundi avec les rencontres des équipes engagées en Ligue Europa. On n'a malheureusement pas pu tester la capacité de réaction du CSKA Moscou, éliminé jeudi soir à Porto (1-2 après avoir perdu 0-1 à l'aller). En raison d'une pelouse impraticable à Samara, le match entre l'ancien club de l'Armée rouge et le Krylya Sovetov Samara a du être reporté. Éliminé par Twente malgré sa victoire lors du match retour (2-0, insuffisant pour rattraper le 0-3 de l'aller), le Zenit Saint-Pétersbourg s'est rattrapé en battant l'Anji Makhatchkala (2-0). Une deuxième victoire en autant de matchs qui lui permet de rejoindre le Roubine Kazan en tête. Dernière équipe russe encore engagée dans les compétitions européennes (vainqueur de l'Ajax Amsterdam 3-0 et 1-0 à l'aller), le Spartak Moscou a obtenu sa première victoire de la saison en battant sur le fil le Volga Nijni Novgorod (1-0).



Résultats :
FK Krasnodar 2-0 Spartak Naltchik
(Buts : Igor Picuşceac (35'), Yura Movsisyan (70'))
Dynamo Moscou 3-1 FK Rostov
(DYN : Leandro Fernández (50'), Zvjezdan Misimović (74' sp), Andreï Voronine (90') ; ROS : Anri Khagouch (85'))
Tom Tomsk 0-1 Kouban Krasnodar
(Sergueï Davydov (83'))
Amkar Perm 1-0 Lokomotiv Moscou
(Stevica Ristić (25'))
Roubine Kazan 2-0 Terek Grozny
(Gökdeniz Karadeniz (33'), Christian Noboa (57'))
Krylya Sovetov Samara – CSKA Moscou
Reporté
Zenit Saint-Pétersbourg 2-0 Anji Makhatchkala
(Roman Chirokov (6'), Danko Lazović (45'+2'))
Spartak Moscou 1-0 Volga Nijni Novgorod
(Welliton (50'))

Classement :
(Points, matchs joues, victoires, nuls, defaites, buts marques, buts encaisses, difference de buts)
1. Roubine Kazan (6, 2, 2, 0, 0, 4, 0, +4)
2. Zenit Saint-Pétersbourg (6, 2, 2, 0, 0, 3, 0, +3)
3. FK Krasnodar (4, 2, 1, 1, 0, 2, 0, +2)
4. FK Rostov (3, 2, 1, 0, 1, 5, 3, +2)
5. CSKA Moscou (3, 1, 1, 0, 0, 2, 0, +2)
6. Dynamo Moscou (3, 2, 1, 0, 1, 5, 4, +1)
7. Volga Nijni Novgorod (3, 2, 1, 0, 1, 2, 1, +1)
8. Lokomotiv Moscou (3, 2, 1, 0, 1, 3, 3, 0)
--------------------------------------------------------------------------------------------
9. Amkar Perm, Kouban Krasnodar, Spartak Naltchik (3, 2, 1, 0, 1, 1, 2, -1)
12. Spartak Moscou (3, 2, 1, 0, 1, 1, 4, -3)
13. Anji Makhatchkala (1, 2, 0, 1, 1, 0, 2, -2)
14. Krylya Sovetov Samara (0, 1, 0, 0, 1, 0, 1, -1)
15. Terek Grozny, Tom Tomsk (0, 2, 0, 0, 2, 0, 3, -3)

Buteurs :
1. Sergueï Ignachevitch (CSKA Moscou) ; Roman Adamov (FK Rostov) ; Christian Noboa (Roubine Kazan) ; Danko Lazovi
ć (Zenit Saint-Pétersbourg) : 2 buts
5. Stevica Ristić (Amkar Perm) ; Leandro Fernández, Kevin Kurányi, Zvjezdan Misimović, Alexandr Samedov, Andreï Voronine (Dynamo Moscou) ; Yura Movsisyan, Igor Picuşeac (FK Krasnodar) ; Sergueï Davydov (Kouban Krasnodar) ; Taras Bourlak, Jan
Ďurica, Dmitri Torbinski (Lokomotiv Moscou) ; Dragan Blatnjak, Timofeï Kalatchev, Anri Khagouch (FK Rostov) ; Gökdeniz Karadeniz, Alan Kassaev (Roubine Kazan) ; Welliton (Spartak Moscou) ; Leandro (Spartak Naltchik) ; Sergueï Bendz, Otar Martsvaladze (Volga Nijni Novgorod) ; Roman Chirokov (Zenit Saint-Pétersbourg) : 1 but

Prochaine journée :
2 avril :Lokomotiv Moscou – FK Rostov
Volga Nijni Novgorod – Dynamo Moscou
Amkar Perm – Krylya Sovetov Samara
3 avril :Anji Makhatchkala – Roubine Kazan
Spartak Naltchik – Zenit Saint-Pétersbourg
CSKA Moscou – FK Krasnodar
Kouban Krasnodar – Spartak Moscou
4 avril :Terek Grozny – Tom Tomsk

 

Karim

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22 mars 2011 2 22 /03 /mars /2011 15:57

L'attaquant de l'OM, Brandão, subit des examens médicaux ce matin et sera présenté officiellement à la presse, comme le nouveau renfort du Cruzeiro pour la saison 2011, cet après-midi  mardi, à 15h30, dans le Terrier du Renard II. Le joueur viendra en prêt jusqu'à décembre 2011.

 

Source : Site Oficial do Cruzeiro

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21 mars 2011 1 21 /03 /mars /2011 16:42

Voici ce que vous lirez en passant votre souris sur le point bleu près de Marseille sur la carte IRSN :

http://www.irsn.fr/FR/Documents/france.htm

Marseille Date de la mesure : 21/03/2011 à 14h25

débit de dose 60 nanoSievert par heure.

Moyenne 2010 : 71 +/- 30%

 

Voilà un site à suivre cette semaine ! (sans être trop inquiets, mais l'info étant disponible, autant regarder de près).

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18 mars 2011 5 18 /03 /mars /2011 23:32

Fri Mar 18, 2011 4:57pm EDT

 

TOKYO (Reuters) - Exhausted engineers attached a power cable to the outside of Japan's tsunami-crippled nuclear station on Saturday in a race to prevent deadly radiation from an accident now rated at least as bad as America's Three Mile Island in 1979.

 

Further cabling inside was underway before an attempt to restart water pumps needed to cool overheated nuclear fuel rods at the six-reactor Fukushima plant in northeastern Japan, 240 km (150 miles) north of Tokyo.

 

Japan's unprecedented multiple crisis of earthquake, tsunami and radiation leak has unsettled world financial markets, prompted international reassessment of nuclear safety and given the Asian nation its sternest test since World War Two.

 

It has also stirred unhappy memories of Japan's past nuclear nightmare -- the U.S. atomic bombs dropped on Hiroshima and Nagasaki in 1945.

 

Working inside a 20 km (12 miles) evacuation zone at Fukushima, nearly 300 engineers were focused on trying to restore power at pumps in four of the reactors.

 

"TEPCO has connected the external transmission line with the receiving point of the plant and confirmed that electricity can be supplied," the plant's operator Tokyo Electric Power Co said in a statement.

 

Another 1,480 meters (5,000 feet) of cable are being laid inside the complex before engineers try to crank up the coolers at reactor No. 2, followed by 1, 3 and 4 this weekend, company officials added.

 

Should that work , it will be a turning point.

 

"If they can get those electric pumps on and they can start pushing that water successfully up the core, quite slowly so you don't cause any brittle failure, they should be able to get it under control in the next couple of days," said Laurence Williams, of Britain's University of Central Lancashire.

 

If not, there is an option of last resort under consideration to bury the sprawling 40-year-old plant in sand and concrete to prevent a catastrophic radiation release.

 

That method was used to seal huge leakages from the 1986 Chernobyl disaster.

 

Underlining authorities' desperation, fire engines sprayed water overnight in a crude tactic to cool reactor No. 3, considered the most critical because of its use of mixed oxides, or mox, containing both uranium and highly toxic plutonium.

 

Japan has raised the severity rating of the nuclear crisis from level 4 to level 5 on the seven-level INES international scale, putting it on a par with the Three Mile Island accident in 1979, although some experts say it is more serious.

 

Chernobyl, in Ukraine, was a 7 on that scale.

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18 mars 2011 5 18 /03 /mars /2011 23:26

Monitoring outputs by MEXT out of 20km Zone of Fukushima Dai-ichi NPP and Dai-ni NPP
MEXT is monitoring the radiation dose rate out of 20km Zone of Fukushima Dai-ichi NPP and Dai-ni NPP and deliver the output as needed for the safety of the evacuees and the residents in the vicinity.  
Readings at Monitoring Post out of 20 Km Zone of Fukushima Dai-ichi NPP

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18 mars 2011 5 18 /03 /mars /2011 23:22

March 18, 2011
Nuclear and Industrial Safety Agency
Seismic Damage Information (the 31st Release)
(As of 22:00 March 18th, 2011)
Nuclear and Industrial Safety Agency (NISA) confirmed the current situation of Onagawa NPS, Tohoku Electric Power Co. Inc.; Fukushima Dai-ichi and Fukushima Dai-ni NPSs, Tokyo Electric Power Co. Inc. (TEPCO); Tokai Dai-ni NPS, Japan Atomic Power Co. Inc. as follows:
Major updates are as follows.
1. Nuclear Power Stations (NPS)
 Fukushima Dai-ichi NPS
<Situation of Water Spray>
・ Hyper Rescue of Tokyo Fire Department arrived at the Main Gate and started an entrance procedure for the preparation of water spray. (23:30 March 18th)
< Recovery of the power supply >
・ A survey was started for the connection to the external power supply for each unit. (23:00 March 18th)
[Unit 1 & 2]
Work for switchboard and cabling is scheduled until March 19th in order to secure external power supply.
[Unit 2]
Access to the substation for reserve power supply from external transmission line was completed and cable connection is under preparation.
[Unit 3,4,5 & 6]
Work for switchboard and cabling is scheduled until March 20th in order to secure external power supply.
2. Action taken by NISA and other agencies
[March 18th]
2
15:55 TEPCO reported to NISA Accidents and Failures with regard to Fukushima Dai-ichi Unit 1,2,3&4 (Leakage of the radioactive materials inside of the reactor building to non-controlled area) pursuant to the Paragraph 3, the Article 62 of the Nuclear Regulation Act.
16:48 JAPCO reported to NISA Accidents and Failures with regard to Tokai Unit 2 (Failure of the seawater pump moter of the emergency diesel generator 2C) pursuant to the Paragraph 3, the Article 62 of the Nuclear Regulation Act.
1. The status of operation at NPS (Number of automatic shutdown units: 10)
 Fukushima Dai-ichi NPS, TEPCO (Okuma Town and FutabaTown, Futaba County, Fukushima Prefecture)
(1) The status of operation
Unit 1 (460MWe): automatic shutdown
Unit 2 (784MWe): automatic shutdown
Unit 3 (784MWe): automatic shutdown
Unit 4 (784MWe): in periodic inspection outage
Unit 5 (784MWe): in periodic inspection outage
Unit 6 (1,100MWe): in periodic inspection outage
(2) Major Plant Parameters (22:00 March 18th)
Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Reactor Pressure*1
[MPa]
0.295(A)
0.252(B)
0.096(A)
0.081(B)
0.085 (A)
0.117(B)

1.767
0.674
CV Pressure
(D/W) [kPa]
180*3
140
160



Reactor Water Level*2 [Mm]
-1,750(A)
-1,800(B)
-1,400(A)
Not available(B)
-1,900(A)
-2,300(B)

1,922
2,364
Suppression Pool Water Temperature
(S/C) [℃]






Suppression Pool Pressure
(S/C) [kPa]
160
down scale
down scale



3
Spent Fuel Pool Water Temperature
[℃]



84
67.6
65
Time of Measurement
21:10
March 18th
21:10
March 18th
21:05
March 18th
04:08
March 14th
21:00
March 18th
21:00
March 18th
*1: Converted from reading value to absolute pressure
*2: Distance from the top of fuel
*3: Recovered
(3) Report concerning other incidents
・ TEPCO reported to NISA the event in accordance with the Article 10 of the Act on Special Measures Concerning Nuclear Emergency Preparedness regarding Fukushima Dai-ichi. (15:42 March 11th)
・ TEPCO reported to NISA the event (Loss of reactor cooling function) falling under the Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness regarding Units 1 and 2 of Fukushima Dai-ichi. (16:36 March 11th)
・ The cable for receiving electricity from the transmission line of Tohoku Electric Power Company was installed. It is scheduled to be connected to Unit 2 after the completion of discharge work. (17:30 March 17th) The content of operations for recovery of external power supply to Unit 1 to 4 (Power supply from Electric transmission grid of Tohoku Electric Power Co., and from the route via transformer sub-station of TEPCO) is being confirmed. (06:30 March 18th)
<Unit 1>
・ Seawater was injected to RPV via the Fire Extinguishing System Line (Started up 11:55 March 13th) →Temporary interruption of the injection (01:10 March 14th)
・ The sound of explosion in Unit 1 occurred. (15:36 March 12nd)
・ Seawater is being injected. (22:00 March 18th)
<Unit 2>
・ Water injection function was sustained. (14:00 March 13th)
・ The Blow-out Panel of reactor building was opened due to the explosion of the Unit 3 reactor building. (After 11:00 March 14th)
4
・ Reactor water level was decreasing. (13:18 March 14th) TEPCO reported to NISA the event (Loss of reactor cooling functions) falling under the Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness. (13:49 March 14th)
・ Seawater injection to RPV was ready through the Fire Extinguishing System line. (19:20 March 14th)
・ TEPCO evaluated core damage of Unit 2 was “less than 5%” (22:14 March 14th)
・ Water level in RPV in Unit 2 is decreasing. (22:50 March 14th)
・ A sound of explosion was made in Unit 2. As the pressure in Suppression Chamber decreased (06:10 March 15th), there was a possibility that an incident occurred in the Chamber. (06:20 March 15th)
・ Access to the substation for reserve power supply from external transmission line was completed and cable connection is under preparation. (22:00 March 18th)
・ Seawater injection to RPV continued. (22:00 March 18th)
・ White smoke continues to be generated from the Blow-out Panel of reactor building.(22:00 March 18th)
<Unit 3>
・ Fresh water was injected to RPV via the Fire Extinguishing System Line (FESL). (11:55 March 13th)
・ Seawater was injected to RPV via FESL. (13:12 March 13th)
・ Injection of seawater for Unit 1 and Unit 3 to the Primary Containment Vessel (PCV) was interrupted due to the lack of seawater in pit. (01:10 March 14th)
・ For Unit 3 injection of seawater into PCV was restarted (03:20 March 14th)
・ The pressure in PCV of Unit 3 rose unusually. (7:44 March 14th) TEPCO reported to NISA the event (Loss of reactor cooling function) falling under the Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness. (7:52 March 14th)
・ For Unit 3 the explosion like Unit 1 occurred around the Reactor Building (11:01 March 14th)
・ The white smoke like steam generated from Unit 3. (08:30 March 16th)
5
・ Because of the possibility that PCV of Unit 3 was damaged, the workers evacuated from the central control room of Unit 3 and 4 (common control room). (10:45 March 16th) Thereafter the operators returned to the room and restarted the operation for water injection. (11:30 March 16th)
・ Seawater was discharged 4 times to Unit 3 by the helicopters of the Self-Defence Force. (9:48, 9:52, 9:58 and 10:01 March 17th)
・ The riot police arrived at the site for grand discharge. (16:10 March 17th)
・ The Self-Defence Force started the water spray from 19:35 March 17th.
・ The water spray from the ground was carried out by the riot police (from 19:05 till 19:13 March 17th)
・ The water spray from the ground was carried out by the Self-Defence Force using 5 cars (March 17th)
(The starting time of water spray by each car: 19:35, 19:45, 20:00 and 20:07 March 17th)
・ The water spray from the ground using 6 fire engines (6 tons of water per car) was carried out by the Self-Defence Force. (from before 14:00 till 14:38 March 18th)
・ The water spray from the ground using a fire engine provided by the US Military was carried out. (finished at 14:45 March 18th)
・ Seawater is being injected to RPV. White Smoke continues to be generated. (22:00 March 18th)
・ Hyper rescue vehicles (30 cars) started entrance procedure for the preparation of water spray. (23:30 March 18th)
<Unit 4>
・ It was confirmed that a part of wall in the operation area of Unit 4 was damaged. (06:14 March 15th)
・ The fire at Unit 4 occurred. (09:38 March 15th) TEPCO reported that the fire was extinguished spontaneously. (11:00 March 15th)
・ The temperature of water in the Spent Fuel Storage Pool at Unit 4 had increased. (84 ℃ at 04:08 March 14th)
・ The fire occurred at Unit 4. (5:45 March 15th) TEPCO reported that no fire could be confirmed on the ground.(06:15 March 16th)
・ Because of the replacement work of the Shroud of RPV, no fuel was
6
inside the PRV. White Smoke continues to be generated (22:00 March 18th)
<Units 5 and 6>
・ Emergency Diesel Generator (1 unit) for Unit 6 is operable and supplying electricity to Units 5 and 6. Water injection to the PRV and Spent Fuel Pool through MUWC is progressing.
<Spent Fuel Storage Facility>
・ It was confirmed that the water level of spent fuel storage pool was maintained full at after 06:00 March 18.
・ As of 11:19 March 18th, the water temperature in the pool is 55℃.
 Fukushima Dai-ni NPS (TEPCO) (Naraha Town / Tomioka Town, Futaba County, Fukushima Prefecture.)
(1) The status of operation
Unit1 (1,100MWe): automatic shutdown, cold shut down at 17:00, March 14th
Unit2 (1,100MWe): automatic shutdown, cold shut down at 18:00, March 14th
Unit3 (1,100MWe): automatic shutdown, cold shut down at 12:15, March 12th
Unit4 (1,100MWe): automatic shutdown, cold shut down at 07:15, March 15th
(2) Major plant parameters (As of 21:00 March 18th)
Unit
Unit 1
Unit 2
Unit 3
Unit 4
Reactor Pressure*1
MPa
0.18
0.11
0.13
0.15
Reactor water temperature

39.7
35.8
27.6
33.2
Reactor water level*2
Mm
10,596
9,996
7,501
9,026
Suppression pool water

29
25
42
32
7
temperature
Suppression pool pressure
kPa
(abs)
144
117
128
121
Remarks
cold shutdown
cold shutdown
cold shutdown
cold shutdown
*1:Converted from reading value to absolute pressure
*2: Distance from the top of fuel
(3) Report concerning other incidents
・ TEPCO reported to NISA the event in accordance with the Article 10 of the Act on Special Measures Concerning Nuclear Emergency Preparedness regarding Unit 1 of Fukushima Dai-ni NPS. (18:08 March 11th)
・ TEPCO reported to NISA the events in accordance with the Article 10 regarding Units 1, 2 and 4 of Fukushima Dai-ni NPS. (18:33 March 11th)
・ TEPCO reported to NISA the event (Loss of pressure suppression function) falling under the Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness regarding Unit 1 of Fukushima Dai-ni NPS. (5:22 March 12th)
・ TEPCO reported to NISA the event (Loss of pressure suppression function) falling under the Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness regarding Unit 2 of Fukushima Dai-ni NPS. (5:32 March 12th)
・ TEPCO reported to NISA the event (Loss of pressure suppression function) falling under the Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness regarding Unit 4 of Fukushima Dai-ni NPS. (6:07 March 12th)
 Onagawa NPS (Tohoku Electric Power Co. Inc.)
(Onagawa Town, Oga County and Ishinomaki City, Miyagi Prefecture)
(1) The status of operation
Unit 1 (524MWe): automatic shutdown, cold shut down at 0:58, March 12th
Unit 2 (825MWe): automatic shutdown, cold shut down at earthquake
Unit 3 (825MWe): automatic shutdown, cold shut down at 1:17, March
8
12th
(2) Readings of monitoring post
Reading of monitoring post:
MP2 (Monitoring at the North End of Site Boundary)
approx. 6,500 nGy/h (19:00 March 14th) →approx. 5,400 nGy/h (19:00 March 15th)
(3) Report concerning other incidents
・ Fire Smoke on the first basement of the Turbine Building was confirmed to be extinguished. (22:55 on March 11th)
・ Tohoku Electric Power Co. reported to NISA in accordance with the Article 10 of the Act on Special Measures Concerning Nuclear Emergency Preparedness. (13:09 March 13th)

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18 mars 2011 5 18 /03 /mars /2011 23:02

 IRSN は3月12日と20日の間、長い距離(数百キロメートルものスケール(はしご))に適用できるそのデジタルのモデルを使った、 Meteo フランスによって供給された天気予報を使った推測される(評価されます)拒絶(解任)の大気の分散を装いました。

 このシミュレーションはこの期間に放射性堂々たる態度の追跡者として、セシウム137 に、応用されました。 このシミュレーションの結果(利益)は、3月12日からすべての時間にされて、そこの空気(視界)(Bq / m3)の1立方メートルについてセシウム137 の表現された becquerels です。 比較として、 Tchernobyl の発電所の近くで測られた値は、1986年4月26日の事故の後に、100 000の Bq / mを超えました;(彼・それ)らは100のオーダーの(こと・もの)でした - 放射性堂々たる態度によって最も得られる(触れられます)国(ウクライナ、ベラルーシ)の1000の Bq / m3 ;フランスで、東洋で測られた値は1986年5月1日に1の10の Bq / m3 のオーダーの(こと・もの)でした).
 今日、空中のセシウム137 残骸(視界)の、0,000001の Bq / m3 のオーダーの非常に卑劣な(弱い)活動。 IRSN によって理解された雲のアニメーションに向かってここにリンクがあります:

 http://www.irsn.fr/FR/popup/Pages/animation_dispersion_rejets_17mars.aspx

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18 mars 2011 5 18 /03 /mars /2011 22:49

Status of TEPCO's Facilities and its services after Tohoku-Taiheiyou-Oki Earthquake (as of 1:00AM)

 

 Due to the Tohoku-Taiheiyou-Oki Earthquake which occurred on March 11th 
2011, TEPCO's facilities including our nuclear power stations have been
severely damaged. We deeply apologies for the anxiety and inconvenience
caused.

Below is the status of TEPCO's major facilities.
*new items are underlined

[Nuclear Power Station]
Fukushima Daiichi Nuclear Power Station:
Units 1 to 3: shutdown due to earthquake
(Units 4 to 6: outage due to regular inspection)

* The national government has instructed to evacuate for those local
residents within 20km radius of the site periphery and to remain indoors
for those local residents between 20km and 30km radius of the site
periphery.

* Unit 1
The explosive sound and white smoke was confirmed near Unit 1 when the
big quake occurred at 3:36pm, March 12th. We have started injection of
sea water at 8:20 pm and then boric acid into the reactor afterwards.

*Unit 2
At 1:25 pm, March 14th, since the Reactor Core Isolation Cooling System
has failed, it was determined that a specific incident stipulated in
article 15, clause 1 of Act on Special Measures Concerning Nuclear
Emergency Preparedness occurred (failure of reactor cooling function).

At 5:17 pm, while the water level in the reactor reached the top of the
fuel rod, we have restarted the water injection with the valve operation.

At approximately 6:14 am, March 15th, the abnormal sound was confirmed
near the suppression chamber and the pressure inside the chamber decreased
afterwards. It was determined that there is a possibility that something
happened in the suppression chamber. While sea water injection to the
reactor continued, TEPCO employees and workers from other companies not
in charge of injection work started tentative evacuation to a safe
location.

Sea water injection to the reactor is still under operation.

As of March 18th , power from offsite transmission line has received
until temporary substation for backup power. Now, cabling to unit
receiving facility is underway.

*Unit 3
At 6:50 am, March 14th, while water injection to the reactor was under
operation, the pressure in the reactor containment vessel increased to
530 kPa. As a result, at 7:44 am, it was determined that a specific
incident stipulated in article 15, clause 1 occurred (abnormal increase
of the pressure of reactor containment vessel). Afterwards, the pressure
has gradually decreased (as of 9:05 am, 490 kPa).

At approximately 11:01 am, March 14th, an explosion followed by white
smoke occurred near Unit 3. 4 TEPCO employees and 3 workers from other
companies (all of them are conscious) have sustained injuries and they
were already dispatched to the hospital by ambulances.

As the temperature of water in the spent fuel pool rose, spraying water
by helicopters with the support of the Self Defense Force was considered,
however the works on March 16th was cancelled.

At 6:15 am, March 17th, the pressure of the Suppression Chamber temporally
increased, but currently it is stable in a certain range. Monitoring will
be continued.
In order to cool spent fuel pool, water discharge by helicopters has been
conducted on March 17th with the cooperation of Self-Defense Force.
At approximately past 7:00 pm, March 17th , Self-Defense Forces and the
police had started water discharge by water cannon trucks upon our request
for the cooperation. At 8:09 pm, March 17th, they had finished water
discharge.
At 2:00 pm, March 18th , water discharge by fire engine has started with
the cooperation of Self-Defense Forces and Military of United States of
America. At 2:45 pm, March 18th , they had finished water discharge.
At 0:45 am, March 19th , water discharge by hyper rescue troop has
started with the cooperation of Tokyo Fire Department. At 1:10 am, March
19th , they had finished water discharge.

* Unit 4
At approximately 6:00 am, March 15th, an explosive sound occurred and
the damage in the 5th floor roof of Unit 4 reactor building was confirmed.
At 9:38 am, the fire near the north-west part of 4th floor of Unit 4
reactor building was confirmed. At approximately 11:00 am, TEPCO employee
confirmed that the fire was off.

At approximately 5:45 am, a TEPCO employee discovered a fire at the
northwest corner of the Nuclear Reactor Building. TEPCO immediately
reported this incident to the fire department and the local government
and proceeded with the extinction of fire. At approximately 6:15 am,
TEPCO staff confirmed at the site that there are no signs of fire.

*On March 18th, regarding the spent fuel in the common spent fuel pool,
we have confirmed that the water level of the pool is secured. A detailed
inspection is under preparation.
*common spent fuel pool: a spent fuel pool for common use set in a
separate building in a plant site in order to preserve spent fuel
which are transferred from the spent fuel pool in each Unit building.

*On March 17th, we patrolled buildings for dry casks and found no signs
of abnormal situation for the casks by visual observation. A detailed
inspection is under preparation.
*dry cask: a measure to store spent fuel in a dry storage casks in
storages. Fukushima Daiichi Nuclear Power Station started to utilize
the measure from August 1995.

*We will continuously endeavor to securing safety, and monitoring of
the surrounding environment.

Fukushima Daini Nuclear Power Station:
Units 1 to 4: shutdown due to earthquake
*The national government has instructed evacuation for those local
residents within 10km radius of the periphery.

*In order to achieve cold shutdown, reactor cooling function was restored
and cooling of reactors was conducted. As a result, all reactors achieved
cold shutdown: Unit 1 at 5:00 pm, March 14th, Unit 2 at 6:00 pm, March
14th, Unit 3 at 0:15 pm, March 12th, Unit 4 at 7:15 am, March 16th.

*Since March 12th, we had been preparing measures for reducing the
pressure of reactor containment vessels (partial discharge of air
containing radioactive materials to outside), but on March 17th,
we released such preparation in all Units.

* (Unit 1)
As it is confirmed that the temperature of the Emergency Equipment Cooling
Water System *1 has increased, at 3:20 pm, March 15th, we stopped the
Residual Heat Removal System (B) for the inspection. Subsequently, failure
was detected in the power supply facility associated with the pumps of the
Emergency Equipment Cooling Water System. At 4:25 pm, March 15th, after
replacing the power facility, the pumps and the Residual Heat Removal
System (B) have been reactivated.

* (Unit 4)
As it is confirmed that the pressure at the outlet of the pumps of the
Emergency Equipment Cooling Water System*1 has been decreased, at 8:05 pm,
March 15th, we stopped the Residual Heat Removal System (B) for the
inspection. Subsequently, failure was detected in the power supply
facility associated with the pumps of the Emergency Equipment Cooling
Water System. At 9:25 pm, March 15th, after replacing the relevant
facility, the pumps and the Residual Heat Removal System (B) have been
reactivated.

*1:emergency water system in which cooling water (pure water) circulates
which exchanged the heat with sea water in order to cool down bearing
pumps and/or heat exchangers etc.

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18 mars 2011 5 18 /03 /mars /2011 22:38

2011年3月18日に、グラハム・アンドリュー、科学的な、そして専門的な問題に対する IAEA 長官への特別なアドバイザー、は日本で核安全の現在の状況について加盟国とメディア両方に短く説明しました。 彼が配達した彼の冒頭の発言14: 00 UTC がウィーンの IAEA 本部で、下に供給されます:

1. 現状

私が昨日報告した(とき・から・につれて・ように)、福島 Daiichi 原子力発電所においての状況は非常に重大なままでいます、しかし我々の最後の要旨説明から悪化している仮数部がありませんでした。

昨日ヘリコプター水下落の主題であったユニット3で、水大砲が(今まで)使用済み燃料池に水をスプレーしていました、そして海水が原子炉圧力容器に注射されました。

重要な安全の心配が Units 3において使用済み燃料プールのままでいるそして4.インフォメーションが使用済み燃料プールで水位と温度の上に欠けています。

問題が普通の使用済み燃料プールで報告されませんでした。 プールの中の使用済み燃料は完全に水によって覆われます。

日本の当局は IAEA ・インターナショナルの核の、そして放射線のイベントスケールの上に事件のために今日新しい評価を発行しました - アイネス。

(彼・それ)らはアイネススケールに対して福島 Daiichi 1、すべての冷却機能の喪失によって起こされた2つと3つの原子炉ユニットにおいて、5としての中核となる損害を課します。

使用済み燃料プールでの冷却と給水が失われたユニット4においての状態は日本の当局によって3と評価されます。

福島 Daini 原子力発電所、1、2と4が同じく評価されたユニットにおける冷却機能の損害において3.福島 Daini においてのすべての原子炉ユニットは状態の下方に閉じられて今風邪にいます。

 

2. 放射能モニタリング

昨日言及されるように、通常のドーズレートインフォメーションが今47の日本の市から受け取られています。

東京と他の市のドーズレートが行動を必要とするであろうレベルから遠いままでいます - 換言すれば(彼・それ)らは人間の健康に危険ではありません。

政府機関の最近到着した放射能モニタリングチームによっての東京で最初の測定が今日ヨード - 131あるいはセシウム - の兆候を示しませんでした137.2番目のサンプリングがオーバーナイトで実行されるでしょう。

 

IAEA のコミュニケの翻訳のための www.reverso.net サイトにありがとうございます。

 

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