ML20096D887

Rev 1 to Annual Rept of All Challenges to PORVs & Safety Valves,1991 Correcting Unit 2 Info Re Reactor Turbine Trip Due to Closure of Three of Four Governor Valves

ML20096D887
Person / Time
Site:	Beaver Valley
Issue date:	05/12/1992
From:	Sieber J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9205180286
Download: ML20096D887 (2)

Text

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Q v a y Power Stat.on Shippmgport. PA 15077-00rA (412) 393 8JS$

JOHN D SIEBER vice Ptesident - % clear Gmup May 12e 1992 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

Beaver Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, Licenso No. NPF-73 Annual Report of All Challenges to the Pressurizer Power Operated Relief Valves or Safety Valves (Rovision 1) i This report is submitted in accordance with the Beaver Valley l Power Station Units No. 1 and 2 Technical Specification 6.9.1.5.b.

This revision corrects the Unit 2 information previously submitted on April 10, 1992.

Unit 11 There were three challenges to the pressurizer safety and power operated relief valves (PORV) at Unit 1 during the period of January 1, 1991, to December 31, 1991.

1. Date: April 13, 1991 Plant Conditions: Mode 4, RCS pressure was 300 p31 9, Overpres-sure Protection System (OPPS) was in service.

A cooldown to Mode 5 was in progress.

Summary: Pressurizer Power Operated Relief Valve, PCV-RC-445C, opened while OPPS was in service due to RCS pressure slowly reaching 327 psig.

Pressure decreased to 303 psig and PORV reclosed.

2. Date: July 4, 1991 Plant Conditions: Mode 4, RCS pressure was 315 psig, Overpres-sure Protection System (OPPS) was in service.

A cooldown to Mode 5 was in progress.

Summary: Pressurizer Power-Operated Relief Valve, PCV-RC-445C, opened for 37 sect ils then reclosed, while reactor operator was controlling RCS pressure in a narrow band to maintain RC-P-1C

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. Beaver Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 Annual Report of All Challenges to the Pressurizer Power Operated Relief Valves or Safety Valves (Revision 1)

April 7, 1992 Page 2

3. Date: September 21, 1991 Plant Conditions: Mode 5, RCS pressure was 360 psig, Overpres-sure Protection System (OPPS) was in service.

Summary: Pressurizer Power Operated Relief Valve, PCV-RC-455C, opened for 10 seconds then reclosed.

The cause for actuation was unknown. No over-pressure condition existed.

E71t 2:

There was one challenge to the pr ssurizer safety and power operated rollef valves (PORV) at Unit 2 during the perled of January 1, 1991, to December 31, 1991.

1. Date: November 26, 1991 Plant Conditions: Mode 1 at 100 percent reactor power, RCS pressure and temperature at normal operating values.

Summary: A reactor / turbine trip occurred due to closure of three of four governor valves. 2RCS*PCV455C opened for 1.546 seconds then reclosed. Tne cause for actuation . was the primary system pressure increase following the load rejection.

Sincerely, 2* AL

~

. . Sieber cc: Mr. L. W. Rossbach, Sr. Resident Inspector Mr. T. T. Martin, NRC Region I Administrator Mr. A. W. DeAgazio, Project Manager j Mr. M. L. Bowling (VEPCO) l

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