Letter Sequence Draft RAI |
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|
|
MONTHYEARML0428903732004-09-30030 September 2004
Response to Request for Additional Information Related to Technical Letter Report on Fourth 10-Year Interval In-Service Inspection Request for Nuclear Management Co., LLC
Project stage: Response to RAI
ML0503502252005-02-18018 February 2005
Relief, Forth 10-Year Inservice Inspection Interval Program Requests for Relief
Project stage: Acceptance Review
ML0610200552006-03-31031 March 2006
Request for Relief REL-021, from the Provisions of the American Society of Mechanical Engineers Code for Inservice Test Requirements
Project stage: Request
ML0619201102006-07-0707 July 2006
Draft RAI on Relief Requests REL-002 and REL-021
Project stage: Draft RAI
ML0631105832006-10-26026 October 2006
Inservice Test Program - Relief Requests REL-002 and REL-021 Request for Additional Information - Response
Project stage: Request
ML0633405162006-12-0808 December 2006
Inservice Testing Relief Requests REL-002 and REL-021 for the Third and Fourth Intervals
Project stage: Other
2006-10-26
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Text
From: Peter Tam To: Scarpello, Michael; Vasey, Bob Date: 07/07/2006 3:50:39 PM
Subject:
Cook: Draft RAI on Relief Requests REL-002 and REL021 (TAC MD2498, 99, MD0939, 40)
Bob, Mike:
We are reviewing REL-002 in your 12/28/05 and REL-021 in your 3/31/06 submittals. Ou reviewer Jack McHale has written the following draft RAI questions. Please call me to schedule a conference call to discuss how we can disposition these questions:
- 1. What is/are the specific failure scenario(s) leading to classification of the subject valves as Category A? Describe the rationale for re-categorizing the valves as Category A, including specific postulated failures of the check valve and gate valve pairs.
- 2. The proposed alternative is to test the subject valves in the direction opposite the direction in which the leakage function applies using the head of RWST water. What is the expected differential pressure for this test and how does it compare with the accident condition where leakage is a concern? Describe how this test provides assurance that the disc face needed for isolation of accident leakage will fulfill its safety function.
- 3. In discussing the burden caused by compliance with the Code, you stated that a system modification would be required to allow isolation of the RWST (REL-021). Describe what modifications were considered and the extent of burden that would be caused by their implementation.
- 4. If system configuration allows for accident direction testing of check valves (SI-101 and SI-185) in series with the motor-operated gate valves (IMO-261, IMO-910, IMO-911) that meets Code requirements for Category A leak testing, has consideration been given to using this test path to test MOV (IMO-261, IMO-910, IMO-911) with the associated check valve internals removed? Are these check valves disassembled and inspected on a regular frequency that would allow a window of opportunity to establish accident direction test conditions for the valves for which relief is requested?
- 5. You stated that at line pressures below 100 psi, the pressure force alone is not sufficient to create a seal and the mechanical force resulting from the disc being wedged between the seat rings provides the additional force necessary to provide a seal. Describe how normal valve operation in the closed direction gives assurance that a leak tight seal is achieved, while still preserving the ability to re-open the valve.
The sole purpose of this e-mail is to prepare you and others for the requested conference call. This e-mail does not convey an NRC staff position, nor does it formaly request for information.
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: McHale, John Mail Envelope Properties
(44AEBB0F.125 : 12 : 35330)
Subject:
Cook: Draft RAI on Relief Requests REL-002 and REL021 (TAC MD2498, 99, MD0939, 40)
Creation Date 07/07/2006 3:50:39 PM From: Peter Tam Created By: PST@nrc.gov Recipients Action Date & Time aep.com Transferred 07/07/2006 3:51:17 PM mkscarpello (Michael Scarpello) rgvasey (Bob Vasey) nrc.gov TWGWPO01.HQGWDO01 Delivered 07/07/2006 3:50:48 PM JJM1 CC (John McHale) Opened 07/07/2006 4:16:15 PM Post Office Delivered Route aep.com TWGWPO01.HQGWDO01 07/07/2006 3:50:48 PM nrc.gov Files Size Date & Time MESSAGE 3770 07/07/2006 3:50:39 PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed
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