05000281/LER-1981-052-03, Valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced

Valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced

ML20070U900
Person / Time
Site:	Surry
Issue date:	01/31/1983
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20070U887	List: 05000281/LER-1981-052-03, Valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced 05000281/LER-1981-074-03, Higher than Normal Activity Detected in Storm Drain Sys.Caused by Leaks from Stripper Feed Steam Heater Due to Failure of Heater Drain Receiver & Pumps to Prevent Overflow.Tubes Plugged 05000281/LER-1983-001, Forwards LER 83-001/03L-0 & Updated LERs 81-052/03X-1 & 81-074/03X-1 05000281/LER-1983-001-03, /03L-0:on 830118,amp Readings for Heat Tracing Panel 8,circuit 13B,fell Below Acceptance Criteria.Caused by Excessive Heat.Defective Heat Tracing Replaced & Tested. Design Change Prepared
References
LER-81-052-03X, LER-81-52-3X, NUDOCS 8302140069
Download: ML20070U900 (3)

LER-1981-052, Valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced

Event date:
Report date:
2811981052R03 - NRC Website

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UPD)T (REPORT - PREVIOUS REPORT DATE 09-14-81 ATTACH!IENT 1 SURRY POWER STATION, UNIT NO. 2 DOCKET NO:

50-281 REPORT NO:

81-052/03X-1 EVENT DATE:

08-15-81 TITLE OF THE EVENT: MOV-SW-202A FAILED TO CLOSE

- 1.

Description of the Event With the unit at full power, during the performance of Periodic Test 25.1, Mov-SW-202A (Service Water to the Flash Evaporator, Vacuum Priming and the Condensate Polishing Building) failed to close due to a grounded motor.

The valve would not have closed automatically if required. This is contrary to T.S.3.4. A.5 and is reportable per T.S.6.6.2.b. (2).

2.

Probable Consequences and Status of Redundant Equipment Following a DBA, water in the intake canal would be used to cool the recirculation spray heat exchangers. The service water valves to vacuum priming, condensate polishing and flash evaporator are designed to close automatically on a CLS Hi-Hi signal in coincidence with a station blackout to conserve water in the intake canal for the recirculation spray heat exchangers. During the time of valve inoperability, the intake canal level was more than 7 feet greater than the minimum required level of 18 feet.

In addition, manual isolation of the flow path remained available. There-fore, the health and safety of the public were not affected.

3.

Cause

The motor operator for MOV-SW-202A was grounded due to flooding in the sump. Water from an equipment leak in the turbine building had collected in the valve pit, and was found to be in contact with the motor operator.

4.

Immediate Corrective Action

The sump was drained, the motor operator was replaced and the valve cycled to verify operability. The valve responded properly.

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Subsecuent Corrective Action None required.

6.

Action Taken to Prevent Recurrence Dikes have been constructed around some valve pits to ininimize water entering the valve pits. An engineering study was performed to determine the cause of false alarms in the control room by flood control relays. It was determined that the 12 Megohm resistors in the relays should be replaced with 22R Ohm resistors to make the relays less sensitive to moisture, thereby minimizing spurious alarms.

UPDATE REPORT - PPEVIOUS REPORT DATE 09-14-81

?>ge 2 Report No. 81-052/03X-1 The 12 Megohm resistors were replaced with 22K Ohm resistors. This provided more accurate information to plant personnel for more effective response to accumulation of water in the valve pits.

7.

Generic Implications None.

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