ML20203J482

Forwards SE Re Reactor & Turbine Building blow-out Panels

ML20203J482
Person / Time
Site:	Nine Mile Point
Issue date:	01/03/1997
From:	Wessman R NRC (Affiliation Not Assigned)
To:	Bajwa S NRC (Affiliation Not Assigned)
Shared Package
ML20197C458	List: IA-97-375, Forwards SE Re Reactor & Turbine Building blow-out Panels ML20197C454 ML20197C477 ML20203J447 ML20203J461 ML20203J482
References
FOIA-97-375 TAC-M94858, NUDOCS 9712190215
Download: ML20203J482 (2)

Text

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• 1 UNITED STATES j , 1 NUCLEAR REQULATORY COMMISSION wasmwetow, e.c. einesen, i

g j N *...+ / January 3, 1997 MEMORANDUM 10: SinhBajwa,ActingDirector Pro ect Directorate I-1 Div sion of Reactor Projects 1/11 FRON: ichard H. Wessman, Chief p Mechanical Engineering Branch Division of Engineering

SUBJECT:

NINE MILE POINT UNIT 1 REACTOR AND TURBINE BUILDING BLOW-0UT  ;

PANELS (TACNO.M94858)

References:

1. Work Request of March 5,1996, from D. S. Hood, PD I-  :

1, to R. H. Wessman, EMEB. i

2. Letter of November 30, 1995, from N. L. Rademacher, Niagara Mohawk Power Corporation Document Control Desk, with enclos(NMPC), to the USNRC ed Licensee Event Report (LER) 95-M 'Nine Mile Point, Unit 1, Building .

Blowout Panels Outside the Design Basis Because of '

Construction Error.'

Per your raquest stated in Reference 1, the Mechanical Engineering Branch (EMEB) has reviewed the technical adequacy, within its scope of review, of NMPC design calculations associated with LER 95-05 (Reference 2). The LER reported that the blowent pressure capacities of butiding blowout panels in the Reactor and Turbine buildings at Nine Mile Point. Unit 1 (NMP1), were underestimated and outside the licensing basis for this plant, as a result of an initial construction deficiency and sub. sequent technical deficiencies in NMPC design calculations performed in 1993. These calculations were serformed to determine the actual blowout capacities of the blowout panels in tiese buildings.

In addition, a concern was also expressed during an enforcement conference held on April 12, 1996, between Region I staff and NMPC, regarding the safety of the condensate storage-tanks housed in the Turbine buildin a blown out relief panel impacting the roof of this butiding.g in the event of CME 6 reviewed the 1993 calculations and verified that they were technically inadequate. EMEB also reviewed subsequent NMPC calculations performed in 1995 to correct the deficiencies of the 1993 calculations and also found them technically inadequate. NMPC revised these calculations, and these were provided to the staff during an audit meeting held at NMP1 on August 20, 1996.

The staff reviewed these ca culations and found them reasonable end acceptable. At this meeting, NMPC also provided calculations to demonstrate the structural integrity of the turbine butiding roof and provide assurance of l CONTACT: M. Hartzman l 415-2755 7[d2278N8'72222 WILLIAM 97-375 PDR ,q/ <

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,, S. Bajra 2 the safety of the condensate storage tanks. These were found to be '

technically deficient, and NMPC submitted revised calculations, which the staff found acceptable.

A detailed evaluation of the calculations is provided in the attached EMEB safety evaluation. .

This, concludes the EMEB effort under TAC No. N94858. "

Docket No. 50-220

Attachment:

As stated Distribution:

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