March 18th, 2011 – IRSN Fukushima Update – Reactor Statuses and Details

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From: Leslie, Bret
Sent: Friday, March 18, 2011 3:35 PM
To: Culp, Lisa
Subject: from irsn

The most recent update – Backgrounder

Situation of nuclear reactors in Japan quake major occurred March 11, 2011

Status report of 18 March 2011 to 14 hours Central Fukushima I (Daiichi)

Since the previous information point March 17, 2011 at 15:00 on the situation in Central Fukushima Daiichi, information obtained by the technical center’s crisis can IRSN to establish the next state facilities.

State pools

The quantities of fuel assemblies present in pools of Units 1 to 4 are confirmed (respectively 292, 587, 514 and 1500 connections). Residual powers
associates have been reported by TEPCO. On this basis, the IRSN has reassessed the time before beginning of uncovering assemblies.

The Power Reactor No. 2 could be restored in the afternoon. Unit 1 could be replenished from the mains common slice 1 and slice 2.

IRSN suspected of leaking pools 1 and 3.

Reactor pool No. 1 The power to be removed is very small (0.07 MW). A drop in water level is assumed to leak in this pool. The use of water hoses on trucks appear to be planned.

Pool reactor No. 2

The pool is boiling. The use of water hoses on trucks appear to be planned, despite the integrity of the upper cladding of the building.

Pool of reactor No. 3

The first was stopped by boiling the extra water by helicopters and water hoses on truck. The IRSN has no information on the effectiveness of watering by water cannons.

IRSN believes that the slab missile located vertically from the tank and the enclosure containment (see Annex 1) had to be destroyed in the explosion of hydrogen of 14 March 2011.

If structures that support this slab were also affected, it is conceivable that the level water above the maximum possible fuel assemblies stored in the pool is decreased (in the worst cases: 1 meter above the top of the joints).

This would explain the flow dose very important right of the building.

Pool reactor No. 4

The pool seems to boil, a steam plume is visible on the engine. Without extra effective, uncovering begin no earlier than March 21. The use of water cannons on trucks appear to be planned.

Reactor pool # 5

The temperature of the water of this pool is stabilized. The water level is controlled.

Pool reactor No. 6

The temperature of the water of this pool is stabilized. The water level is controlled.

Cooling pool common site

This pool would contain about 6500 assemblies. Although the power generated per unit by them is significantly lower than that generated from these assemblages in pools reactors, they must nevertheless be well chilled.

The IRSN has no information on the status of this pool and could not make estimation delay before uncovering assemblies.

State Reactor

IRSN is concerned about the amount of salt crystallized after the injection of seawater into the reactor vessels. In general, it should restore water reserves Fresh on the site.

Reactor No. 1

According to the operator, 70% of the reactor core is damaged. The injection of seawater into the tank would be maintained to ensure core cooling but remains partially dewatered.

The water in the tank is discharged into the containment via a valve.

The containment integrity is maintained. There is probably more operations depressurization of the containment. There would therefore be more direct release of products radioactivity into the atmosphere.

The upper part of the reactor building was blown by an explosion. Control Room is very radiant, limiting the time spent by the stakeholders.

Reactor No. 2

According to the operator, 33% of the reactor core is damaged. The injection of seawater into the vessel is maintained to ensure the cooling of the heart that is now under water.

The containment building is damaged, however it does not appear that the seal be filed in question (the pressure inside the building is fluctuating).

There is probably more depressurization operations of the containment. There would no longer release direct radioactive products into the atmosphere.

The control room is very radiant, limiting the time spent by the stakeholders.

Reactor No. 3

The reactor core is partially damaged. The injection of seawater in the tank would maintained to ensure core cooling but remains partially dewatered.

The steam produced in the fuel tank in contact with the drains in the containment that always seems tight. There is probably more operations depressurization containment. There would therefore be more direct release of radioactive products in the atmosphere.

The upper part of the reactor building was blown by an explosion.

Control Room is very radiant, limiting the time spent by the stakeholders.

Reactor No. 4

The upper part of the building is damaged. The control room is very radiant, limiting the time spent by the stakeholders.

Reactor No. 5 and 6

The heart of each of these reactors is loaded into fuel assemblies. Water injection in these vessels is scheduled for today Friday, March 18.

Central Fukushima II (DOE)

Reactor No. 1, 2, 3, 4

On this site, reactors 1, 2, 3 and 4 have reached normal stopping conditions (called “stop cold “). No degradation of fuel has taken place on these reactors.

Central Onagawa and Tokai

There is no specific item to report.


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