View source for 05000281/LER-1981-052, Updated LER 81-052/03X-1:on 810815,valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced

{{Adams
| number = ML20070U900
| issue date = 01/31/1983
| title = Updated LER 81-052/03X-1:on 810815,valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced
| author name = Wilson J
| author affiliation = VIRGINIA POWER (VIRGINIA ELECTRIC &amp; POWER CO.)
| addressee name = 
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| docket = 05000281
| license number = 
| contact person = 
| document report number = LER-81-052-03X, LER-81-52-3X, NUDOCS 8302140069
| package number = ML20070U887
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 3
}}
{{LER
| Title = Updated LER 81-052/03X-1:on 810815,valve MOV-SW-202A Failed to Close Due to Grounded Motor.Grounding Caused by Flooding in Sump.Motor Replaced
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000281
| LER year = 2081
| LER number = 52
| LER revision = 
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

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 - ,: il               With the unit at full power, during the performance of Periodic Test 25.1.                                                                             I
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: is ; ;              flow path remained available and the intake canal level was more than 7 feet                                                                            I, I7l l             greater than the minimum required level of 18 feet, the health and safety of the                                                                       1
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                                                                                   ,                       .i                              As            o                   o CAUSE DESORIPTION AND CORRECTIVE ACTIONS 27 i  eoll The groundinc of MOV-SW-202A'e raotor m dem en finnA4ne 4e 4+e                                                                 e-,.        The cunn                   I si g j motor was replaced and the valve evcled to verifv operabilitv.                                                                                                      I I
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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.                          I S.        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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