March 11th, 2011 – Premonitions of North Anna EQ – Why does the NRC have confidence that an eq greater than DB cannot occur in the US

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From: Richards, Stuart
Sent: Friday, March 11, 2011 6:12 PM
To: Hogan, Rosemary; Graves, Herman; Kammerer, Annie; Murphy, Andrew
Cc: Case, Michael; Uhle, Jennifer
Subject: Follow-up to the Japanese Earthquake/Tsunami

Brian wants us to be prepared to answer questions on the earthquake/tsunami, particularly as it is related to US plants.


For example:
– Was the ground motion at the Japanese sites beyond their design basis?
– Why do we have confidence that US nuclear power plants are adequately designed for earthquakes and tsunamis?
– If the earthquake in Japan was a larger magnitude than considered by plant design, why can’t the same thing happen in the US?
– What would be the results of a tsunami generated off the coast of a US plant? (Or why are we confident that large tsunamis will not occur relatively close to US shores?)


Mike will likely get additional guidance on Monday morning.

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March 11th, 2011 – USGS guy on BBC just said that in response to the earthquake they went into “salami response mode”

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