Letter Sequence Draft RAI |
|---|
|
|
MONTHYEARML0717300472007-06-13013 June 2007
License Amendment Request to Reduce Maximum Ventilation System Hepa/Charcoal Pressure Drop Allowed by Technical Specifications
Project stage: Request
ML0726400582007-09-18018 September 2007
D.C. Cook: Draft RAI on Proposed Amendment HEPA Filter Pressure
Project stage: Draft RAI
ML0801006952008-01-14014 January 2008
D.C. Cook, RAI on Proposed Amendment Regarding Acceptance Criteria for Filter Pressure Drop Test
Project stage: RAI
ML0805303952008-02-13013 February 2008
Response to Request for Additional Information Regarding Proposed Amendment to Reduce Maximum Ventilation System Filter Pressure Drop
Project stage: Response to RAI
ML0812302692008-04-28028 April 2008
Tech Spec Pages for Amendments 305 and 288 Regarding Maximum Ventilation System Filter Pressure Drop
Project stage: Other
ML0807701782008-04-28028 April 2008
Issuance License Amendments 305 and 288 Regarding Maximum Ventilation System Filter Pressure Drop
Project stage: Other
2008-01-14
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Text
From: Peter Tam To: Scarpello, Michael; Simpson, Sue Date: 09/18/2007 4:00:53 PM
Subject:
D.C. Cook: Draft RAI on proposed amendment re. HEPA filter pressure (TAC MD5931, 2)
Sue:
We are reviewing your applciation for amendment dated June 13, 2007, which proposes to change the Technical Specification surveillance testing acceptance criteria for the Ventilation Filter Testing Program (Technical Specification 5.5.9). Our reviewer Bruce Heida has determined additional information is needed to complete the review, as follows:
You determined that the existing acceptance values are non-conservative. You implemented administrative controls to impose a more restrictive acceptance criterion for the Technical Specification surveillance testing pending the license amendment.
You stated that calculations for the proposed surveillance testing acceptance criteria are based on applicable fan curves and ventilation industry handbook data on system and component resistances. The allowable filter pressure drop is based on [filter] vendor recommendations.
The staff agrees that the existing non-conservative acceptance criterion should be replaced. However, per 10 CFR Part 50.36(c)(3), the staff believes that the acceptance criterion should be based on the total filter assembly pressure drop needed to assure the required minimum air flows. Filter vendor recommendations should be used to determine when to replace individual banks of filters. In order to complete the evaluation of this license amendment, the staff needs the following additional information:
(1) Are the calculated maximum allowable filter assembly pressure drops for the various systems greater than the combined filter vendors= recommended maximum pressure drop values?
(2) How do the handbook resistance values compare with the Aas installed@ and Aas operated@ pressure loss values? Are the Aas installed@ pressure loss values from a testing and balancing (TAB) report?
(3) The licensee indicates that the <four inch water gauge acceptance criterion is based on vendor recommended values for the HEPA/charcoal adsorber assembly. Are pre-filters installed? If pre-filters are installed, why are they not included in the filter assembly total allowable pressure drop?
(4) If testing (TAB or ANSI N509 '8.5.1) has not been performed, how does the licensee assure that the ventilation systems will provide the required minimum air flow at the requested maximum (<four inches water gauge) filter assembly pressure drop?
This e-mail aims solely to prepare you and others for a conference call to discuss these draft questions.
This e-mail does not convey a formal NRC staff position, and does not formally request for additional information. However, with or without the conference call, we plan to issue the questions as a formal RAI in about a month.
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: Bruce Heida Mail Envelope Properties (46F02E75.337 : 12 : 35330)
Subject:
D.C. Cook: Draft RAI on proposed amendment re. HEPA filter pressure (TAC MD5931, 2)
Creation Date 09/18/2007 4:00:53 PM From: Peter Tam Created By: PST@nrc.gov Recipients Action Date & Time aep.com Transferred 09/18/2007 4:01:07 PM mkscarpello (Michael Scarpello) sdsimpson (Sue Simpson) nrc.gov OWGWPO02.HQGWDO01 Delivered 09/18/2007 4:00:58 PM BRH1 CC (Bruce Heida) Opened 09/18/2007 4:51:38 PM Post Office Delivered Route aep.com OWGWPO02.HQGWDO01 09/18/2007 4:00:58 PM nrc.gov Files Size Date & Time MESSAGE 4059 09/18/2007 4:00:53 PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard ReplyRequested: No Return Notification: None Concealed
Subject:
No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened
