NRC Transcripts – Once Fukushima Daiichi went into station blackout containment would be lost – Outer reaches of plume distance would be unknown

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MALE PARTICIPANT: You know, Pete Lyons in DOE has been just itching to find a niche here. And if there’s some specific scenario you want INEL to run, just let us know and we can reach out to Pete.

CHUCK CASTO: I would just ask for their recommendations. You know, they’ve got all the science. They have these codes that can run this event, that have run this event. They ran it for Peach Bottom. They ran this event for a number of sites.

And, you know, you may just want to reach out, and we may just want to reach out and ask them what their recommendations are based on MELCORE, and I don’t know, I can’t remember all those code names, but there’s a lot of different ones. Do they have recommendations about the crust that forms and keeping water on it, and keeping the right pH, all that stuff.

And, you know, if we end up with a molten core and then you talk about the time for the concrete to disassociate, you know, that NUREG says it’s a couple of inches an hour, you know. And, of course, that Mark 1 containment is the worst one of all the containments we have, and it’s literally, you know, this NUREG tells you that in a station blackout you’re going to lose containment. There’s no doubt about it.

But, anyhow, I just would highlight that that is a valuable resource, that NUREG. I think it’s — is it 6150, CR-6150, Perspectives on Nuclear Safety? It completely walks all of this down. It’s already been thought out. It’s already been reviewed, looked at, modeled, everything.

So, the one thing the NUREG doesn’t really do is tell you how to stop it, how to mitigate it, other than keeping water on it.

But the Lab may have some recommendations.

MALE PARTICIPANT: Right. So, we’ll get the next shift working on that, to engage through Pete Lyons.

CHUCK CASTO: Yes. Yes. So, I would have somebody from WANO join us to open up that line.

MALE PARTICIPANT: Yes, we’ll follow up. That’s an action item for the next shift, too. And ask INPO to identify somebody to come over and join your team.

CHUCK CASTO: And, then, get WANO to brief us out the back door out of those meetings.

MALE PARTICIPANT: Yes. Well, first, I’m going to try to get you in the meetings. Okay?

CHUCK CASTO: Yes, that’s what I said. I would reach out to the Lab on some of those models that they have and get some recommendations from the Lab about projection on dose. I’ll tell you, from what I know and what I’ve seen, it doesn’t have a good outcome in a station blackout for this length of time.

PAT: Right.

CHUCK CASTO: So, you could just about assume it’s going to go its course —

PAT: Right.

CHUCK CASTO: — with the Mark 1 containment. Now the question is, you know, what happens to the vessel? But, you know, the containment is probably not going to last at all. So, then, you’ve got to start running some other models that they have that they reference in that NUREG. And I think the Lab can probably, you know, they’ve done the studies. They can probably give you some recommendations about what kind of releases you’re talking about and how far.

PAT: Okay.

CHUCK CASTO: Yes, I think what we’re looking for here is, what’s the outer reaches of the distance, you know?

Ministry leaders decided to hold nuclear data after Fukushima crisis – Mainichi

TOKYO (Kyodo) — The science minister and other top ministry officials decided to withhold radiation forecast data from the public four days after the March 11 earthquake and tsunami triggered a nuclear crisis at the Fukushima Daiichi power plant, an internal document made available Friday showed.

Then Education, Culture, Sports, Science and Technology Minister Yoshiaki Takaki, lawmakers serving as top ministry officials and top bureaucrats made the decision on March 15 to withhold data about the predicted spread of radioactivity, which included an assumption that all radioactive material would be discharged from the crippled plant.

The document stated that radioactive clouds could spread from the crippled nuclear power plant to the Kanto and Tohoku regions, indicating that the ministry had made various estimates about the spread of released radioactive substances, including the worst-case scenario.

ML113640254 – Assessment of Current Test Methods for Post-LOCA Cladding Behavior



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