ML110390656

E-mail from R.Guzman to D.Vandeputte - Request for Additional Information Div 3 EDG CT Extension LAR - PRA Review

ML110390656
Person / Time
Site:	Nine Mile Point
Issue date:	02/08/2011
From:	Richard Guzman Division of Operating Reactor Licensing
To:	Vandeputte D Nine Mile Point
Guzman R, NRR/DORL, 415-1030
References
TAC ME3736
Download: ML110390656 (1)

Text

From: Guzman, Richard Sent: Tuesday, February 08, 2011 4:16 PM To: 'Vandeputte, Dennis E' Cc: 'Dosa, John J'

Subject:

NMP Unit 2 Div 3 EDG CT Extension - Supplemental Questions for Response to PRA RAI (TAC No. ME3736)

Dennis, As discussed during todays conference call, the NRC staff requests additional information (in the two follow-up questions shown below) supplementing NMPNSs RAI response letter dated January 14, 2011 (ADAMS Accession No. ML110250271). The NRC staff requests you provide the information as a formal, docketed response by February 28, 2011.

Supplemental RAI #8f:

In RAI 8f, the licensee stated that there were no fire protection separation requirements deficiencies in the plant. However, PRA peer review finding 3-6 (Table 1 of the March 30, 2010 submittal) identifies a door between Division 1 and Division 2 switchgear which is currently blocked open, and there is a design change (not yet implemented) to put an automatic latch to close the door on a fire alarm. The licensee is requested to provide a discussion on the current plant design of this doorway and assess the impact on the fire PRA results (or why there is minimal/zero impact).

Supplemental RAI #9c The response indicates that for fire scenarios, recovery of the DGs unaffected by fire is credited. For non-fire scenarios, it is stated that recovery of the out-of-service DG is not credited. It is not clear to the NRC staff if the out-of-service DG (i.e., the DG which is out for a 14-day extended outage) is assumed recoverable for a fire scenario, which would not be appropriate for the risk calculations for this LAR. The licensee is requested to clarify its response to this RAI.

Thanks, Rich Guzman Sr. Project Manager NRR/DORL US NRC 301-415-1030 Richard.Guzman@nrc.gov