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REG711EA-5/2K5 其他数据使用手册 - TI（德州仪器）
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5V,50mA开关电容DC/DC转换器
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REG711EA-5/2K5数据手册
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October 6, 2005
EA-05-176
Mr. David A. Christian
Senior Vice President and
Chief Nuclear Officer
Innsbrook Technical Center
5000 Dominion Boulevard
Glen Allen, VA 23060-6711
SUBJECT: NRC INSPECTION REPORT 05000305/2005011(DRP)
PRELIMINARY GREATER THAN GREEN FINDING
KEWAUNEE POWER STATION
Dear Mr. Christian:
On September 6, 2005, the U.S. Nuclear Regulatory Commission (NRC) completed an
inspection at your Kewaunee Power Station (KPS). The results of this inspection were
discussed on September 6, 2005, with Mr. Michael Gaffney and other members of your staff.
The inspection examined activities conducted under your license as they relate to safety and
compliance with the Commission’s rules and regulations and with the conditions of your license.
The inspectors reviewed selected procedures and records, observed activities, and interviewed
personnel.
This report documents one finding that appears to have substantial to high safety significance.
As described in Section 1R06 of this report, this NRC-identified finding involves the potential
impact from turbine building flooding scenarios on multiple safety related equipment trains that
are used to reach and maintain safe shutdown of KPS. Specifically, the KPS design may not
have been adequate to prevent the loss of safety function for the auxiliary feedwater (AFW)
system, 480 and 4160 volt electrical buses, and the emergency diesel generators (EDGs).
This finding was assessed based on the best available information, including influential
assumptions, using the Reactor Safety Significance Determination Process (SDP) and was
preliminarily determined to be a Greater than Green Finding. The final resolution of this finding
will convey the increment in the importance to safety by assigning the corresponding color
(i.e., (White) a finding with some increased importance to safety, which may require additional
NRC inspection; (Yellow) a finding with substantial importance to safety that will result in
additional NRC inspection and potentially other NRC action; or (Red) a finding of high
importance to safety that will result in increased NRC inspection and other NRC action). The
finding appears to have substantial to high safety significance because the likelihood of core
damage increased significantly due to a potential loss of decay heat removal and electrical
power needed to ensure the plant could be safely shutdown and maintained shutdown for
design and license basis events. This finding did present an immediate safety concern in that
the inadequate flood protection could have resulted in the loss of multiple trains of safety
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