ML19319E499
| ML19319E499 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/30/1975 |
| From: | Marlin J, Phillips J, Rueter D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E495 | List: |
| References | |
| NUDOCS 8004110661 | |
| Download: ML19319E499 (3) | |
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Abnormal Occurrence Report No.
50-313/75-1 2.
Report Date:
1/30/75 3.
0ccurrence Date:
1/20/75 4
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas S.
Identification of Occurrence.:
Reactor Building Ccoling Unit Service Water Inlet ES Valve CV-3813 failed to open on command and Service Water Outlet ES Valve CV-3814 did not reach its full open position during surveillance testing.
6.
Conditions Prior to Occurrence:,
Steady-State Power X
Reactor Power 2530 MWth Hot Standby Net. Output 835 MWe Cold Shutdown Percent of Full Power 98.5 %
Refueling Shutdown Routine Startup n.
Operation
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Routine Shutdown Operation Load Changes During Routine Power Operation Other (Specify) 7.
Description of Occurrence:
At 17:45 an attempt was made to conduct a quarterly surveillance test on the Reactor Building Cooling units, per Operating Procedure 1104.33. Upon command. to open, CV-3813 failed to clear its closed limit.
CV 3815 responded properly.
The alternate loop service water isolation valves were stroke tested and CV-3812 operated properly, but CV-3814 did not reach a full open position.
and deactivated.
The two valves were manually assisted open
- 8004110 July 5, 1974 NSP-10, Rev. O Page 1 of 3 i
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Abnormal Occurrence Report No.
50-313/75-1 Sheet 2 8.
Designation of Apparent Cause of Occurrence:
Design Procedure Manufacture Unusual Service X
Condition Including Installation /
Environmental Construction Component Failure Other (Specify)
X The CV-3813 failure appears to be from lack of lubrication or pneumatic piston operators, resulting in binding of the operator.
The cause of CV-3814 failure is unknown at this time.
9.
Analysis of Occurrence:
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There were no safety implications or hazards to the public health or
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safety involved since one Reactor Building cooling loop was operable through the partially open valve and both reactor building spray loops were operable.
Both Reactor Building cooling loops were made operable by locking CV-3813 and CV-3814 in the open position.
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10.
Corrective At:lon:
ES valve, CV-3813, was lubricated, stroked, and declared operable.
CV43814 was lubricated, but would still bind before reaching its full open position. This valve will be dismantled, inspected and subse-quently repaired at the next plant shutdown.
CV-3814 will remain locked in the open position until plant shutdown.
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Abnormal Occurrence Report No.
50-313/75-1 Sheet 3 11.
Failure Data:
There have been no other failures of this type.
Operator Name Plate Data: Contromatics Model SRMS, Serial #83154A-1-2 and Serial #83154A-1-3.
- 12. Reviews and Approvals:
Reviewed and Approved by:
Plant Safety Committee Yes (X)
No ( )
Plant Superintendent Yes (X)
No ( )
Reference:
JWA-821 Date: 1/28/75
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Reviewed by:
Date: /
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p Licensing' upervi pr Approved by 8'////
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' Safety' Review Committee Approved y:
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Approved by:
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Director'o$PowerProduction Approved by:
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July S, 1974 NSP-10, Rev. O Page 3 of 3
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