ML19319E536
| ML19319E536 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/13/1976 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E529 | List: |
| References | |
| NUDOCS 8004110800 | |
| Download: ML19319E536 (4) | |
Text
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1.
Abnormal Occurrence Report No.
50-313/75/11
~
2.
Report Dato:
1/13/76 3.
Occurrence Date:
12/29/75 4.
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas 5.
Identification of Occurrenec:
Reactor Building Isolation valve CV-2233, failed to close.
6.
Conditions Prior to Occurrence:
Steady-Stato Power Reactor Power 0
Mh'th ibt Standby Not Output 0
MNe Cold Shutdown X
Percent of Fu'11 Power 0
g Refueling Shutdown _
Load Changes L1uring Routinc Power Operation j
Routine Startup
~~ l Operation Routinc Shutdown Operation 5
Other (specify) i, 7.
Description of Occurrence:
~
At-1658 hours on December 29, 1975, the intermediate cooling water system reactor. building isolation valve, CV-2233, would not close remotely from the control room. An investigation was made and the air supply to the operator was found isolated and the valve held open by a handjack pre-venting it from closing.
It appears this condition has existed since the week of October 26, 1975, when the. plant was shutdown for control rod repatch.
(
. March 4, 1975 NSP-10,' Rev. 2 Page 2 of 4 a
6 C
A6 normal Occurrence Report No.-
50-313/75-11 Y
l 8.
Designation of Apparent Cause of Occurrence:
4 Design Procedure Manufacture Unusual Service Condition Including Environmental Installation /
l Construction Component Failure.
Operator X
1
~
Other (specify)
The operaitor apparently failed to make proper valve line up verification per Standing Order No. 3 which requires the operator to insure air is available to,the operator and all manual overrides are removed.
. ~
- 9.. Analysis of Occurrence:
4 Since the redundant isolation valve was operable, this incident did not
]
affect the health and safety of the public.
t is:
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March 4, 1975 NSP-10, Rev. 2 Page 3Of4 i
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Abnormal Occurrence Report No. 50-313/75-11 4
i 10.
Corrective Action:
l The correct valve alignment was made and all other remotely operated 4
i safety related valves were checked and verified overable. This incident will be discussed with the operators to assure they'are all familist with l
l how to"make a valve line up verification.
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Falliire Data:
1 None e.
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March ~4, 1975 NSP-10, Rev. 2 Page 4 e ea
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