ML19309D886
| ML19309D886 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 08/25/1977 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19309D874 | List: |
| References | |
| NUDOCS 8004110721 | |
| Download: ML19309D886 (4) | |
Text
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Reportable Occurrence Report No.
S0-313/77-15 2.
Report Date: 8/2S/77 3.
Occurrence Date:
7/26/77 4
Facility:
Arkansas Nuclear One - Unit 1 Russellville, Arkansas 72801 S.
Identification of Occurrence:
Exceeding the allowable leakage from penetrations per Tech. Spec. 4.4.1.2.3.
6.
Conditions Prior to Occurrence:
Steady-State Power X
Reactor Power 2S68 MWth Hot Standby Net Output 773 Mwe Cold Shutdown Percent of Full Power 100 g
Refueling Shutdown Load Changes During Routine Power Operation Routine Startup Operation Routinc Shutdown Operation Other (specify)
- 7.. Description of Occurrence:
During leak rate resting of reactor building penetrations in February 1977, the Instrument Group found and repaired three penetrations with leakage great enough that the leakage rate could not be determined. The Instrument Group was working under the assumption that the maximum leakage that could be tested was less than 60% La.
In the solution of the NRC's unresolved item 77-03, (ISE Inspection Report No. 50-313/77-03) it was determined that i
the maximum testable leakage was greater than 60% La and that we may have been in violation of Tech. Spec. 4.4.1.2.3.
O
W Reportable Occurrence Report No.
50-313/77-15 8.
Designation of Apparent Cause of Occurrence:
Design Procedure 1
Manufacture Unusual Service Condition Including Environmental Installation /
Construction Component Failure.
(See Failure Data)
Operator Other! (specify)
X It appears that foreign matter may have caused the isolation valve to not perform properly.
9.
Analysis of Occurrence:
Since the surveillance testing indicated that the penetration isolation valves were lenking and the leakage was reduced to allowable limits prior to establishing cautainment integrity, there was no hazard to the health and safety of th public.
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Reportable Occurrence Report No.
50-313/77-15 i
10.
Corrective Action:
The leakage was reduced to an allowable limit by repairing the
_ isolation valves for the penetrations in questions (No. 51, V-1 and V-2).
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Failure Data:
1 1
None.
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