ML19319E497
| ML19319E497 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/16/1975 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E495 | List: |
| References | |
| NUDOCS 8004110650 | |
| Download: ML19319E497 (3) | |
Text
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Abnormal Occurrence Report No.
50-313/75-1A
'2.
Report Date:
July 16, 1975 3.
Occurrence Date:
January 20, 1975 4
Facility:
Arkansas Nuclear One-Unit'l Russellville,. Arkansas 5.
Identification of Occurrencc:
Reactor Building Cooling Unit Service Water Outlet ES valve CV-3814 did not reach its full open position during surveillance testing.
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- 6. - Conditions Prior to Occurrence:
Steady-State Power X
Reactor Power 2530 Sixth liot Standby Not Output 835 3;wo Cold Shutdown Percent of Full Power 98.5
?,
Refueling Shutdown Load Changes During Routine
[]i Power Operation Rout 2nc Startup s
Operation i'
Routino Shutdown
~0peration a
Other (specify) s.
7.
Description of Occurrence:
At_1745 hours 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 but CV-3815 responded properly. The valve was repaired and A0 report number 50-313/75-1 was transmitted. The alternate loop service i
water 1:,olation valves were stroke ' tested and CV-3812 responded properly,-but CV-3814 did not. Cause of. failure could not be immedia-tely determined.
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- 8. : -Designation of Apparent Cause of 0ccurrence:
50-313/75-1A
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Design Procedure ir-
. Unusual Service Condition i
bbnufacture i
l-Including Environmental j
Installation /
Construction
' Component Failure 1
i 0perator Other (specify).
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l Cause of failure is galling of the. metal between the valve stem and its i
upper. bushing.
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Analysis of Occurronec:
L See Abnormal Occurrence Report No. 50-313/75-1 dated 1/30/75.
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50-313/75-1A 10.
Corrective Action:
The construction of these valves are butterfly type with a vertical stem of stainless steel with a stainless steel bushing on-each side of'the bdtterfly and there are no provisions for lubrication of the bushings.
1 Rue stem was polished to remove scratches and upset metal on its surface and the bushings were honed smooth. The bushings were lubricated with
- Fel-Pro N-1000, the valve was reassembled and verified operable.
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Failuro Data:
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See Abnormal Occurrence Report No. 50-313/75-1 dated 1/30/75.
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