NRC Transcripts show concerns about Fukushima Daiichi Reactor 1 Explosion

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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION

JAPAN’S FUKUSHIMA DAIICHI ET AUDIO FILE

Saturday, March 12, 2011


CHAIRMAN JACZKO: — the updates, and I won’t have to do that as much.

We have video footage that we believed showed containment has been violated.

MR. DORMAN: Yes, what is it, is — I’ll try to describe it for you.

From a distance, you’ve got the plants in the center.

You’ve got four reactor buildings and behind them, from the point of view of the camera, is the turbine building and then the sea, and what you see is, on the left-most, which would be the Unit 1, from the vicinity of the reactor building, you see an initial vertical pulse —

CHAIRMAN JACZKO: Yes.

MR. DORMAN: — and then a large white cloud, spread out from that reactor building, and then you have footage of a later image, where you have the three reactor buildings to the right are solid white images, and the one where the — you know, the explosion occurred, appears to be the metal frames of the portion of the building above the refueling plug and the spent fuel pool.

CHAIRMAN JACZKO: Okay.

MR. DORMAN: And based on that, our assessment is, it appears to have been an event that originated in the reactor building.

CHAIRMAN JACZKO: Okay.

MR. DORMAN: And our assessment is that there is possibility that that would — and event like that involved a failure of the primary containment.

CHAIRMAN JACZKO: Okay.

MALE PARTICIPANT: Yes.

MALE PARTICIPANT: Well, there’s no smoke. It looks like steam, or some kind of vapor.

MR. DORMAN: Or yes, the —

MALE PARTICIPANT: It doesn’t look like smoke, and there was no fire ball.

CHAIRMAN JACZKO: Okay.

MR. DORMAN: And some of that’s pulverized concrete, too.

MALE PARTICIPANT: Yes.

CHAIRMAN JACZKO: And then the IAEA piece of information we have, can you describe that to me, again?

MR. DORMAN: The IAEA, we talked to them, a little over an hour ago, from their operations center, and Mark Shafer was on their end.

We basically confirmed that they are as starved for facts as we are.

MALE PARTICIPANT: Right.

CHAIRMAN JACZKO: Okay.

MR. DORMAN: So, there — unfortunately, we were mutually unable to help each other, much.

MR. DORMAN: The other issue that we’ve raised is that the apparent mode of force for such an event in the turbine building would be hydrogen that cooled the turbine, and we don’t see any deflagration issue, in terms of —

CHAIRMAN JACZKO: Okay.

MR. DORMAN: — we don’t see any flame —

CHAIRMAN JACZKO: Right, which you’d see from a hydrogen explosion.

MR. DORMAN: Right.

CHAIRMAN JACZKO: Okay, good, thanks.

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