March 14th, 2011 – Chairman Request – Review level eq vs design basis

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From: Rihm, Roger
Sent: Tuesday, March 15, 2011 8:22 AM
To: Glitter, Joseph
Subject: RE: Clarifying Questions on the Table
Importance: High

Joe, hopefully you saw the clarifying email from Michael Marshall. Sorry I couldn’t get you 2 on the same email trail, but I couldn’t get your address to come up on my BBerry!

In terms of how the Chairman is planning to use this info, I think that’s sort of TBD until he sees what you are able to produce, how it looks, and what it means to him.

For example, we had asked Annie for a graphic that, upon discussion with the Chairman, he decided hedidn’t want produced because it was going to be too complicated to understand.

Please just do the best you can.

It would probably be preferable to send a partial product of whatever you have produced by about 9:45, so I can vet with Michael M and the Chairman while you continue to work. It is possible that decisions on proceeding might be made upon review of a partial product.


From: Guitter, Joseph
Sent: Monday, March 14, 2011 9:47 PM
To: Rihm, Roger
Cc: Howe, Allen; Nelson, Robert; Hiland, Patrick; Kammerer, Annie; Stutzke, Martin
Subject: Clarifying Questions on the Table

I cc’d you on an earlier e-mail. I wasn’t sure what you meant by reference level earthquake. Did you mean review level earthquake? Also, I wondered how the Chairman was planning to use this information.

The design basis is usually expressed in terms of ground acceleration (horizontal) with a more complete description in terms of a curve showing acceleration versus frequency.

However, you wouldn’t be able to infer what level earthquake (for example, on the Richter Scale) the plant would handle without the soil characteristics, etc.

Sorry if I’m being pedantic–I just want to make sure we give you what you’re looking for.

Also, I could anticipate that the Chairman might get a question about whether the NRC licensed coastal plants are designed for a design basis eathquake in combination with a maximum probable tsunami.

Let me know if you need that information.

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