ML20209G261

Forwards Draft Request for Addl Info Re GL 96-06 Response

ML20209G261
Person / Time
Site:	Beaver Valley
Issue date:	07/12/1999
From:	Dan Collins NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
GL-96-06, GL-96-6, TAC-M96777, NUDOCS 9907190106
Download: ML20209G261 (3)

Text

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%g 4,,,, July 12,1999 MEMORANDUM TOEDocket File)

FROM: Daniel Collins, Project Manager, Section 1 / c,,i / f d6~

Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation

SUBJECT:

BEAVER VALLEY POWER STATION, UNIT 2, DRAFT REQUEST FOR ADDITIONAL INFORMATION, REGARDING GENERIC LETTER 96-06 RESPONSE, TAC NO. 96777 The attached draft request for additional information (RAI) was transmitted by electronic facsimile on July 12,1999, to John Maracek of Duquesne Light Company (the licensee)in preparation for an upcoming conference call between the NRC staff and the licensee. The purposes of the conference call are to (1) briefly review the items so that the staff may provided any needed clarification of the information sought, and (2) allow the licensee to 4 l

determine and agree upon a. schedule to respond to the RAI. This memorandum and the attachment do not convey a formal request for information or represent an NRC staff position.

I Docket No. 50-412

Attachment:

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DRAFT The NRC staff has been reviewing Duquesne Light Company's (DLC's) letter dated June 2,1999, which submitted the executive summary from the Beaver Valley Power Station, Unit No. 2 (BVPS-2), Contoament Penetrations Overpressure Protection Analysis. This report was submitted to the NRC to support the staff's Generic Letter 96-06 review for BVPS-2. The staff would like to discuss the following two items identified during review of this report:

1. Section 4.4 of the report discusses penetrations associated with the Reactor Vessel Level Instrumentation System (RVLIS). This discussion notes that, in the event of a loss of coolant accident (LOCA), the six penetrations associated with the RVLIS will be protected from overpressurization of the tubing and hydraulic isolator located outside containment by failure of the high volume sensor bellows. The staff notes that, while such a bellows failure may protect the penetration from overpressurization, it would likely result in the RVLIS being inoperable. The staff would like to discuss how inoperabil;ty of the RVLIS following a design basis LOCA is accounted for in the BVPS-2 licensing basis and emergency procedures.

2. Section 4.10 of the report discusses penetrations where insulation inside containment is credited for acting as a thermal barrier to prevent overpressurization of the penetrations.

The discussion concludes that the insulation provides sufficient protection from the inimediate, short-term effects of a design basis accident, but provides no discussion of the long-term temperature changes of these penetrations. The BVPS 2 UFSAR does not contain containment temperature profile information which is sufficient for the staff to evaluate the long-term temperature behavior of these penetrations. The staff would like to discuss the long-term temperature response of these penetrations following a design basis LOCA.

DRAFT

V .

, July 12, 1999 l

l MEMORANDUM TO: Docket File FROM: Daniel Collins, Project Manager, Section 1 Project Directorate i ORIGINAL SIGNED BY:

Division of Licensing Project Management Office of Nuclear Reactor Regulation

SUBJECT:

BEAVER VALLEY POWER STATION, UNIT 2, DRAFT REQUEST FOR ADDITIONAL INFORMATION, REGARDING GENERIC LETTER 96-06 RESPONSE, TAC NO. 96777 The attached draft request for additionalinformation (RAl) was transmitted by electronic facsimile on July 12,1999, to John Maracek of Duquesne Light Company (the licensee)in preparation for an upcoming conference call between the NRC staff and the licensee. The purposes of the conference call are to (1) briefly review the items so that the staff may provided any needed clarification of the information sought, and (2) allow the licensee to determina and agree upon a schedule to respond to the RAl. This memorandum and the attachment do not convey a formal request for information or represent an NRC staff position.

Docket No. 50-412

Attachment:

As stated DISTRIBUTION Docket File #

PUBLIC SBajwa DCollins OFFICE PDJ:1/PM PDb2llk/

NAME Dhbs Mhb' rib'n DATE 7 //k/99 /M/99 OFFICIAL RECORD COPY /

DOCUMENT NAME: G:\PDI-1\ Beaver 2\GL9606rai.wpd i

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