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Text
From: Peter Tam To: Scarpello, Michael; Simpson, Sue; Steinmetz, Keith Date: 11/21/2007 12:31:46 PM
Subject:
D.C. Cook - Revised and Additional Draft RAI Questions (TAC MD5899, MD5900)
Keith:
Our reviewers, Audrey Klett and Vijay Goel, have revised draft questions (4) and (5), and have added draft question (6), as follows. Please let me know if you need another conference call to discuss these questions before we issue all 6 questions in a formal RAI.
(4) Provide a summary of the latest EDG sizing calculation.
(5) Clarify why the voltage values indicated in the SRs of TS 3.8.1 are lower than the minimum degraded voltage function allowable value indicated in TS SR 3.3.5.3 (see NRC Information Notice 2007 09, "Equipment Operability Under Degraded Voltage Conditions,"
ADAMS Accession Number ML070390066).
(6) Confirm and/or provide the documentation which shows that the EDG can pick up and accelerate the first block of loading within 10 seconds at the voltage and frequency mentioned in the SRs of TS 3.8.1 (i.e., the SRs which require verification that the EDG can achieve voltage
$ 3740 V and frequency $ 58.8 Hz in # 10 seconds) based on a LOOP/LOCA event. Confirm that this voltage and frequency are the same at which the EDG breaker closes resulting in picking up the first block of loading.
Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation e-mail: pst@nrc.gov Tel.: 301-415-1451 CC: Audrey Klett; Vijay Goel Mail Envelope Properties (47446B82.2D6 : 12 : 35330)
Subject:
D.C. Cook - Revised and Additional Draft RAI Questions (TAC MD5899, MD5900)
Creation Date 11/21/2007 12:31:46 PM From: Peter Tam Created By: PST@nrc.gov Recipients Action Date & Time aep.com Transferred 11/21/2007 12:32:26
PM kasteinmetz (Keith Steinmetz) mkscarpello (Michael Scarpello) sdsimpson (Sue Simpson) nrc.gov OWGWPO02.HQGWDO01 Delivered 11/21/2007 12:31:52 PM VKG CC (Vijay Goel) nrc.gov OWGWPO04.HQGWDO01 Delivered 11/21/2007 12:31:52 PM ALK1 CC (Audrey Klett)
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