ML20246P072

Application for Amend to License DPR-3,adding Snubber DRH-SNB-1 to Table 3.7-4 of Tech Spec 3.7.9

ML20246P072
Person / Time
Site:	Yankee Rowe
Issue date:	03/21/1989
From:	Drawbridge B YANKEE ATOMIC ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20246P076	List: ML20246P072 ML20246P140
References
BYR-89-53, NUDOCS 8903280106
Download: ML20246P072 (2)

Text

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YANKEEATOMICELECTRIC COMPANY "'C"%o"g*g,'*;"l"

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IN'b.g. 580 Main Street, Bolton, Massachusetts 01740-1398

.YAN

-. KEE March 21, 1989 PC 218 BYR 89-53 United States Nuclear Regulatory Commission Document Control Desk 1 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) i (b) Letter, YAEC to USNRC, dated June 1, 1987 (c) Letter, USNRC to YAEC, dated July 16, 1987 (d) Letter, USNRC to YAEC, dated March 21, 1988 i

Subject:

Addition of Snubber to Pressurizer Drain Piping i

Dear Sir:

Pursuant to Section 50.90 of the Commission's Rules and Regulations, the Yankee Atomic Electric Company hereby requests authorization to make the following changes.

Proposed Change Reference is made to the Technical Specifications of the Yankee Nuclear Power Station's Operating License No. DPR-3. We hereby propose to modify the ]

license as follows: Add Snubber DRH-SNB-1 to Table 3.7-4 of Technical i Specification 3.7.9.

The revised page is attached.

Reason and Basis for Change In Reference (b), Yankee committed to re-evaluate certain piping located l inside the Vapor Container including the Pressurizer drain piping (Line

{ No . 1"-DRH-2502-15 ) . This piping has been evaluated using criteria reviewed and approved by the staff in References (c) and (d).

As a result of the evaluation of the Pressurizer drain piping, one snubber (DRH-SNB-1) was added during the November 1988 refueling outage. Per the footnotes to Table 3.7-4, the snubber may be added without prior License Amendment. With the addition of the snubber and other pipe support modifications, the Pressurizer drain piping meets criteria acceptable to the staff.

Safety Considerations This change is requested in order to add Snubber DRH-SNB-1 to Table 3.7-4 8903200106 890321 lg PDR ADOCK 05000029 P PDC

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United States Nuclear Regulatory Commission BYR 89-53 Attedtion: Mr. Morton B. Fairtile, Project Manager Page 2 of the Yankee Nuclear Power Station Techr.ical Specifications. As such, this proposed chanFe would not:

1. Involve a significant increase in the probability or consequences of l an accident previously evaluated. The snubber will enhance the l

I seismic resistance of the Pressurizer drain line.

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2. Create the possibility of a new or different kind of accident from any previously evaluated. The snubber will in no way prevent the Pressurizer drain piping from performing the piping's intended function.

3. Involve a significant reduction in a margin of safety. The analysis of the Pressurizer drain piping together with the in-service inspection requirements for snubbers in the Technical Specification ensures that this change does not involve a significant reduction in margin of safety.

Based on the discussion above, it is concluded that there is reasonable assurance that operation of the Yankee plant, consistent with the proposed Technical Specifications, will not endanger the health and safety of the public. This proposed change has been reviewed by the Nuclear Safety Audit l and Review Committee. '

We trust that you will will find this submittal satisfactory; however, should you desire additional information, please contact us. l Verr tru1 3 urs,

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IEE ATO C ELECTRIC COMPANY

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• D) j B. L. Drawbridge /

BLD/b11/0257v Vice Preshent4nd Manager of Operations Attachments cc: USNRC Region I USNRC Resident Inspector, YNPS l

COMMONWEALTH OF MASSACHUSETTS)

)ss MIDDLESEX COUNTY )

Then personally appeared before me, B. L. Drawbridge, who, being duly sworn, did state that he is Vice President and Manager of Operations of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing document in the name and on the behalf of Yankee Atomic Electric Company and that the statements therein are true to the best of his knowledge and belief.

< Or a bmumer Helen D.' Sammarco Notary Public My Commission Expires November 7, 1991

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