05000280/LER-1981-015-03, /03L-0:on 810603,spent Fuel Pit Overflowed Into New Fuel Handling Area & Outside to Storm Drain.Caused by Leaking Diaphragm Valve & Defeated High Level Alarm Annunciator.Valve Repaired

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/03L-0:on 810603,spent Fuel Pit Overflowed Into New Fuel Handling Area & Outside to Storm Drain.Caused by Leaking Diaphragm Valve & Defeated High Level Alarm Annunciator.Valve Repaired
ML20009F714
Person / Time
Site: Surry Dominion icon.png
Issue date: 07/03/1981
From: Joshua Wilson
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F711 List:
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8107310446
Download: ML20009F714 (2)
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LER-1981-015, /03L-0:on 810603,spent Fuel Pit Overflowed Into New Fuel Handling Area & Outside to Storm Drain.Caused by Leaking Diaphragm Valve & Defeated High Level Alarm Annunciator.Valve Repaired
Event date:
Report date:
2801981015R03 - NRC Website
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ATTACHMENT 1 SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280 REPORT NO:

81-015/03L-0 EVENT DATE:

06-03-81 UNPLANNED RELEASE OF RADI0 ACTIVE WATER 1.

DESCRIPTION OF EVENT

On June 3,1981, with the unit at cold shutdown, the spent fuel pit overflowed to the new fuel handling area. The spent fuel pit water flowed out the handling area and into a storm drain located outside of the fuel building. 'This event is,i contrary to Tech. Spec. 3.11.A.5 and is reportable per Tech. Spec. 6.6.2.b.(h) /,

The inleakage of primary grade water increased the water level in the spent fuel pit.

2.

PROBABLE CONSEOUENCES:

The inleakage of primary grade water will reduce the boron concentration in the u wever. Snent fuel pit boron concentration did not decrease spent fuel pit.

n below the Administrative Limit. of 2000 ppm.

A very small quantity of water reached the storm drains ( = 105 gals.) and the activity release was within Tech. Spec. limits (.0056% of Tech. Spec.).

Therefore, the health and safety of the public were not affceted.

3.

CAUSE

The cause for the unplanned release waa due to a combination of component failure and personnel error. A leaking diaphrap valve associated with the fuel pit l

ion exchanger increase the speat fuel pit leve.l.

The spent futi pit "high level" alarm annunicator was made inoperatle without, documenting the existance of this condition. The annunicatur was made inoperable to silence frecuent, spurious j

alarms that had been occuring due to activity in the spent fuel pit.

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IMMEDIATE CORRECTIVE ACTION

The immediate corrective action was to locate and isolate the source of inleakage.

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5.

SUBSEOUENT CORRECTIVE ACTION:

i The leaking valve was repaired and the annunicator was returned to service.

6.

ACTION TAKEN TO PREVENT RECURRENCE:

The fuel building will be modified to direct water entering the new fuel area to an existing sump. This s_ ump discharges to tha liquid waste svntem.

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7.

GENERIC IMPLICATIONS:

None.

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