Thursday, February 7, 2013

#Fukushima I Nuke Plant: Has TEPCO Just Dropped 1.5-Tonne Steel Debris in Reactor 3 Spent Fuel Pool?

NHK News says it may have.

From NHK News (2/8/2013; part):


A 1.5-tonne steel debris, which had been submerged in the water but visible in the Reactor 3 Spent Fuel Pool at Fukushima I Nuclear Power Plant, went missing. TEPCO thinks it may have dropped into the Spent Fuel Pool, and will use the underwater camera to make sure the spent fuel rods are unaffected.


The work to remove the debris near the Reactor 3 Spent Fuel Pool has been on-going, in order to remove the spent fuel in the future.


According to TEPCO, when they monitored the condition of the pool using the remote-controlled camera after the work on February 6 they noticed the 1.5-tonne steel debris which had been mostly submerged in the center of the pool but visible was completely invisible.


TEPCO concluded that the debris may have fallen into the pool. The company will use the underwater camera as soon as it is ready to check on the debris and the spent fuel.

From TEPCO's handout for the press in English, 2/8/2013:

Possibility of Debris (Assumed to be the Fuel Handling Machine Mast) Sinking in the
Spent Fuel Pool at Debris Removal from the Upper Part of the Unit 3 Reactor
Building at Fukushima Daiichi Nuclear Power Station

At the steel truss debris removal from the upper part of the spent fuel pool performed on February 6, 2013, the
debris assumed to be the fuel handling machine mast* which was present before the steel truss removal was
found to be missing in the image taken after the removal work. On February 7, we judged that there is a possibility
that the missing debris has sunk into the pool.

*Fuel handling machine mast: Extendable pole used to lift the grip up and down when moving the fuel assemblies (Length: Approx. 5-23m, Weight: Approx. 1.5 tons)

Once the preparation is complete, we will investigate the condition of the sunken debris when we perform
investigation of the inside of the spent fuel pool utilizing an underwater camera.


tigny said...

it looks like the water level increased in the SFP, doesn't it?

Anonymous said...

This is funny. Judging solely from the two pictures, I'd say that, rather, the entire FHM has slipped now underwater, whereas before the mast was still visible.

Anonymous said...

The video here titled 'Possibilty of ...' shows it fall, with a big splash!

But in the eyes of TEPCO that's still a 'possibility' ...

Anonymous said...

Sorry the link in the comment above didn't parse for some reason :(

arevamirpal::laprimavera said...

Thanks for the video link. I see. Quite a possibility, so much so that it is a certainty.

TechDud said...

Seems like the only thing they can do, is raise the water to be "proactive" should any great masses get closer & become more reactive.

Curious, was that mast simply bolted to the concrete, or was there a base for it, and wouldn't it have been, or still be, part of the SFP wall itself?

arevamirpal::laprimavera said...

I think it was part of the fuel transfer machine.

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