ML20244C759

Provides Supplemental Info to Util 890321 Proposed Change 218 to Add Snubber to Pressurizer Drain Piping to Enhance Seismic Capability of Piping

ML20244C759
Person / Time
Site:	Yankee Rowe
Issue date:	04/14/1989
From:	Papanic G YANKEE ATOMIC ELECTRIC CO.
To:	Fairtile M NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
BYR-89-74, NUDOCS 8904200400
Download: ML20244C759 (2)

Text

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'Y4 KEEATOMICELECTRICCOMPANY "'fE"*lo" *jl,'g*;"l"

[ 580 Main Street, Bolton, Massachusetts 01740-1398 -

April 14, 1989 BYR 89-74 United States Nuclear Regulatory Commission j Document Control Desk '

-Washington, DC 20555 Attention: Mr. Morton B. Fairtile, Project Manager Project Directorate I-3 Division of Reactor Projects I/II

References:

(a) License No. DPR-3 (Docket No. 50-29)

(b) Letter, YAEC to USNRC, Addition of Snubber to Pressurizer Drain Piping (Proposed Change 218), dated March 21, 1989 (c) Document No. DC-1, Revision 4, Seismic Re-evaluation and Retrofit Criteria

Subject:

Additional Information for Proposed Change 218

Dear Sir:

This letter provides the supplemental information requested with regards to Proposed Change 218, addition of a snubber to the Pressurizer Drain piping

[ Reference (b)].

The addition of the snubber will enhance the seisaic capability of the Pressurizer Drain piping. The snubber will not reduce the capability of the i Pressurizer Drain piping to perform its operating or emergency functions. The design criteria [ Reference (c)] provides assurance that the piping and snubber will perform their intended normal and emergency functions.

No accident analysis assumptions are affected by the addition of the snubber. l I

Therefore, based on the discussion above, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated. '

The design criteria [ Reference (c)] and installation requirements used are at least equal to the original plant design basis. The Pressurizer Drain piping with snubber installed is in a stress analyzed condition meeting the requirements of the design criteria. Therefore, the proposed change does not create the possibility of a new or different kind of accident from any previously evaluated. l h

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-dnited States Nuclear Regulatory Conunission April 14, 1989

( Attention: Mr. Morton B. Fairtile, Project Manager Page 2-BYR 39-74 ,

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The addition of the snubber does not affect the~ basis of any Technical-Specification. . Also, there are no accident analysis assumptions affected.

_Therefore, the proposed change'does not involve a significant reduction in a margin of safety.

We trust that the information provided herbin is satia.fector y; however, if there are any questions,'please contact us.

Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY u<~

Georg Papanic, Mr.

Senior Project Engineer GP/b11/0296v cc: USNRC Region I USNRC Resident Inspector, YNPS i

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