ML19319E540
| ML19319E540 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/13/1976 |
| From: | Rueter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E529 | List: |
| References | |
| NUDOCS 8004110803 | |
| Download: ML19319E540 (4) | |
Text
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Abnormal Oc.rrence Report No. 50-313/75-12 2.
Report Date:
1/13/76 3.
Occurrence Date:
12/29/75 4
Facility:
Arkansas Nuclear One-Unit.1 Russellville, Arkansas 5.
Identification of Occurrence:
Service Water System Valve to Decay Heat Cooler, CV-382,1, failed to open.
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Conditions Prior to Occurrence:
Steady-State Power Reactor Power 0
MWth llot Standby Net Output 0
Mwe Cold Shutdown X
Percent of Full Power o
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Refueling Shutdown Load Changes During Routine Power Operation l
Routine Startup Operation Routine Shutdown Operation Other (specify) 3 i
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bescription of occurrence:
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At 1310 hours0.0152 days <br />0.364 hours <br />0.00217 weeks <br />4.98455e-4 months <br /> on December 29, 1975, the service water valve CV-3821 to j
decay heat cooler taika t: :pe... automatically when decay hsat pump was started. The valve, however, opened manually.
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March 4, 1975 NSP-10, Rev. 2 Page 2 of 4
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'N Abnormal Occurrence Report No.
50-313/75-12 8.
Designation 'of Apparent Cause of Occurrence:
Design Procedure I
t Manufacture Unusual Service Condition including iinvironmental Installation /
I Construction Component Failurc Operator Other (specify)
-X The cause was probably an increase in binding in the valve, packing or l
seating the valve hard against the valve seat manually.
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Analysis'of Occurrence:
Since cooling water is not needed until transfer of the decay heat pump to the reactor building sump during a LOCA, there was more than an adequate amount of time for the valve to be opened manually. This incident would not have affected the health and safety of th,e public.
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March 4, 1975 NSP-10, Rev. 2 Page 3 Of 4 i
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Abnormal. Occurrence Report No.
50-313'/75-12 i
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Corrective Action:
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A slight adjustment was made to the torque switch.
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Failuro Data:
None.
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' March 4, 1975 NSP-10, Rev. 2 Page a of 4 E
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