March 31st, 2011 – RE: Why are there no emergency diesels in U.S. nuclear power plants?

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From: Bonaccorso, Amy
To: Tobin. Jennifer
Subject: RE: Why are there no emergency diesels in U.S. nuclear power plants?
Date: Thursday, March 31, 2011 9:21:49 AM

Jenny:

After I sent this email – I think I read something about someone in Congress proposing lengthening the time that backup equipment can function.. .after I read that, it was like “Oh, okay, I get it!” Don’t know if I should mention that. I don’t know what the requirements are in other countries, but if they are more robust than ours, that is going to become a concern.

Thanks,
Amy

From: Tobin, Jennifer
Sent: Wednesday, March 30, 2011 5:11 PM
To: Bonaccorso, Amy
Subject: RE: Why are there no emergency diesels in U.S. nuclear power plants?

Amy,

Our plants are currently required to have at least 8 hours of battery power for essential reactor functions. Our regulations assume that power to the plant can be restored within that 8 hour timeframe. Power is needed for the cooling systems associated with the core to run. My guess would be that as a result of the events at Fukushima that the NRC may be looking into extending the time period for operating un-attached to the electrical grid.

-Jenny

Jenny (Tobin) Wollenweher
Expert Licensing Officer
Office of International Programs
Offic: 301-415-2328

From: Bonaccorso, Amy
Sent: Wednesday, March 30, 2011 1:56 PM
To: Tobin, Jennifer
Subject: FW: Why are there no emergency diesels in U.S. nuclear power plants?

Jenny:

Do you know anything about this topic of power plants cooling their cores within eight hours of disconnecting from the grid and why that would be so upsetting to someone?

Thanks,
Amy

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