ML19305B815

Responds to NRC 800223 Ltr Re LWR Primary Coolant Sys Pressure Isolation Valves.All Plant Sys Have Been Reviewed to Determine Existence of Event V Valve Configuration.Only Safety Injection Sys Fits NRC Configuration Description

ML19305B815
Person / Time
Site:	Beaver Valley
Issue date:	03/17/1980
From:	Dunn C DUQUESNE LIGHT CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
TAC-12922, NUDOCS 8003200409
Download: ML19305B815 (4)

Text

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(412) 456-6000 435 Suth Avena ttsDurg%. Pa March 17, 1980 Director c2 Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn: D. G. Eisenhut, Acting Director Division of Operating Reactors Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 LWR Primary Coolant System Pressure Isolation Valves Gentlemen:

Provided herewith are three (3) originals and thirty-seven (37) copies of the response to your letter dated February 23, 1980, which identified an accident mode from WASH 1,00 which is a significant contributor to risk from Event V accidents and requested information from licensees relating to the existence of the p'. ping configuration identified therein in the licensees plant and the methads used, or planned to be used, to assure component integrity.

In response to the numbered questions requested pursuant to 10 CFR 50.54(f) on page 2 of your letter, the following informacion is submitted:

1. We have reviewed all plant systems to determine the existence of an Event V valve configuration of the type described by the two examples in your letter and have concluded that the Safety Injection System is the only system at Beaver Valley Unit No. I which fits this descrip-tion. Figure 1, attached hereto, describes the valve configuration for this system at Beaver Valley Unit No. 1.

2. At the present time, three of the check valves (1SI-10, 11 and 12) and the motor operated valve (MOV-SI-890C) are required to be leak tested at 18 month intervals in accordance with the in-service inspection requirements contained in the ASME Boiler and Pressure Vessel Code,Section II. The other check valves shown on Figure 1 are not required to be leak tested. None of these valves are con-tinuously monitored for leakage. We have reviewed the maintenance history records for these six check valves and none have a record of, nor are known to have had leakage problems which could lead to an Event V failure.

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. . B21vsr Vallsy Power Station, Unit No. 1 ,

Dock 2t No. 50-334

• LWR Primary Cpolent System Prasaure Icalation Valvan Page 2

3. We believe that the leak tightness of the check valves can be improved by observing the upstream pressure af ter each event which could allow the check valves to open. Therefore, we will install a pressure gauge between the check valves and the discharge of the

- Low Head Safety Injection Pumps, and we will prepare procedures which will require observation of the pressure gauge for indications of check valve leakage af ter any operation of the LESI pumps or if the RCS pressure is reduced below the LHSI pump discharge pressure.

Beaver Valley Unit No.1 is presently shut down for refueling and major modifications. The commitments described in paragraph 3 above will be accomplished prior to plant startup.

Very truly yours, 2 -

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C. N. Dunn Vice President, Operations Attachment i'

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(CORPORATE SEAL)

Attest:

{^(/ t( . (2 r # (O -t n u Joan S. Senc}iyshy'n Asst. Secretary COMMONWEALTH OF PENNSYLVANIA)

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COUNTY OF ALLEGIENY )

On this / 7 '# day of M// /2d // , 1980, before me, 1)0NATln W M m ON , a Notary Public in and for said Commonwealth and County, personally appeared C. N. Dunn, who being duly sworn, deposed, and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge, information and belief.

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DONALD W. SHANNON. NOTARY PUBLIC PITTSBURG4. ALLEGHENY COUNTY NY COMMIS$1CN EXFif.ES JUNE 7,1933 Member, PexnyNar.is Axciaten cf Notates

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