ML18139B214

Updated LER 80-013/03X-1:on 800206,valve HCV-1852A to Tank 1-SI-TK-1A Delayed Closing 30-50 Secs,Resulting in Tank Draining Below Tech Spec Level.Caused by Moisture in Air Lines Feeding Valve Operator.Tank Filled to Tech Spec Level

ML18139B214
Person / Time
Site:	Surry
Issue date:	03/27/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B212	List: ML18139B211 ML18139B213 ML18139B214 ML18139B215 ML18139B216
References
LER-80-013-03X, LER-80-13-3X, NUDOCS 8104020630
Download: ML18139B214 (2)

Text

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U.S. NUCLEAR REGULATORY COMMISSION

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UPDATE REPORT LICENSEE EVENT REPORT PR~S R~PORT DATE 03-05-80 CONTROL BLOCK;~'__...__...__..._.....,~..... -.!l(!) CPL.EASE PRINT OR TYPE ALL REQUIREC INFORMATION!

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VENT OESC!=IIPTION ANO PROBASi.E CONSEQUENCES@ .

jUnit #1 was at 100% power. Operating personnel were recirculating the accumulator

!III] .J tanks prior to obtaining samples. Valve HCV-1852A to tank 1-SI_-TK-lA delayed closing I____ _

())7)j30-50 seconds after the operator operated the c~ntrol. This caused the tank to ~_rain

((IIJ 1down to 45% level and reduced the pressure below 600 .PSIG contrary to Tech. Spec.

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III[) !3.3.A.2. This is reportable in accordance with Tech. Spec. 6.6-.2.b,2. The redundant I_-.....

[IIIl 1accumulattl>rs were available, therefore, the safety and health of the public were not* I

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~104020680

ATTACHMENT, PAGE 1 OF 1 SURRY POWER STATION , UNIT 1 DOCKET NO: 50-280 REPORT NO: 80-013/03X-l EVENT DATE: 02-06-80 TITLE OF REPORT: ACCUMULATOR TANK 1-SI-TK-lA LEVEL AND PRESSURE OUT OF SPECIFICATION .

1. DESCRIPTION OF EVENT:

Unit Number One was at a steady state condition at 100 percent power. The Operator was recirculating the accumulator tanks prior to taking samples.

The Control Valve, HCV-1852A, to tank 1-SI-TK-lA, apparently stuck in the open position for 30-50 seconds after the operator set the valve to close.

This allowed the tank level to drop to approximately 45 percent and the pressure to drop below 600 PSIG. Immediate steps were taken to refill and pressurize the tank. The tank was below the Techincal Specifications require-ments outlined in 3.3.A.2 for a period of 25 minutes. Paragraph 3.3.B.l permits one accumulator; ,to be isolated for period not bo exceed 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. This event is reportable in accordance with Technical Specification 6.6.2.b.2.

2. PROBABLE CONSEQUENCES AND STATUS OF REDUNDANT SYSTEMS:

The redundant accumulators were available, therefore, the health and safety of the public were not affected.

3. CAUSE:

The cause of the event is believed to be moisture in the air:lines feeding the valve operator. Subsequent to this event, the valve had been cycled with satis-factory results.

4. IMMEDIATE CORRECTIVE ACTION:

The immediate corrective action* was to restore the tank to Technical Specification limits.

5. SUBSEQUENT CORRECTIVE ACTION:

Since the valve has operated satisfactorily since the event, no further action is required.

6* ACTIONS TAKEN TO PREVENT RECURRENCE:

None required.

7. GENERIC IMPLICATIONS:

There are no generic implications.