March 15th, 2011 – We do not have sufficient information to compare US & Japanese batteries

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From: Taylor, Robert t
Sent: Tuesday, March 15, 2011 2:32PM
To: Wilson, George; Mathew, Roy; McConnell, Matthew
Cc: ‘- -Hiland, Patrick; Skeen, David; Thomas, Eric; Sigmon, Rebecca; King, Mark
Subject: RE: Battery Answer

Thanks.

From: Wilson, George
Sent: Tuesday, March 15, 2011 2:32 PM
To: Taylor, Robert; Mathew, Roy; McConnell, Matthew
Cc: Hiland, Patrick; Skeen, David; Thomas, Eric; Sigmon, Rebecca; King, Mark
Subject: Battery Answer

Rob, use this answer in lieu of what was previously sent

We currently do not have sufficient information to compare the differences in design requirements and performance characteristics of nuclear-grade batteries in the U.S. and Japanese nuclear power plants.

However, in the U.S., nuclear power plants utilize redundant nuclear-grade (i.e., Class 1E, safety-related) batteries that are designed and constructed using rigorous standards and are routinely tested in accordance with plant technical specifications to ensure adequate capacity and capability exists to perform their intended safety functions. These batteries are located in structures that can withstand natural phenomena such as earthquakes, tornadoes, tsunami, and floods in accordance with NRC regulations. For U.S. nuclear power plants, the typical design duty cycles for safety grade batteries range from 1-8 hrs.

George Wilson
USNRC
EICB Branch Chief, Division of Engineering
Mail Stop 012H2
301-415-1711

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