ML19317H068
| ML19317H068 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/29/1977 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19317H067 | List: |
| References | |
| NUDOCS 8004110840 | |
| Download: ML19317H068 (4) | |
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Reportable Occurrence Report No. 50-313/77-10 2.
Report Date: April 29, 1977 3.
Occurrence Date:
March 31,1977 4
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas 72801 S.
Identification of Occurrence:
The occurrence is the failure to perform a complete surveillance test at the required frequency.
6.
Conditions Prior to Occurrence:
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Steady-State Power Reactor Power o
MWth 4
Hot Standby Net Output 0
MWe Cold Shutdown Percent of Full i'ower o
Refueling Shutdown Load Changes During Routine Power Operation Routine Startup
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Operation Routine Shutdown Operation Other (specify)
X Starting Plant Heatup Following Refueling 7.
Description of Occurrence:
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At approximately 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on March 31, 1977, a leak rate test performed on the Reactor Building Escape Hatch on March 19, 1977, was found to have been improperly perfomed by an instrument technician. This is a test required to establish Reactor Building integrity per Tech. Spec. 3.6.1.
The reactor was at 2000F at 0935 hours0.0108 days <br />0.26 hours <br />0.00155 weeks <br />3.557675e-4 months <br /> on March 31, 1977.
The nals on both doors had been checked, but the cavity between the doors had not been checked on March 19, 1977.
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Reportable Occurrence Report No.
50-313/77-10 8.
Designation of Apparent Cause of Occurrence:
I Design Procedure Manufacture Unusual Service Condition Including Environmental Installation /
Construction Component Failure (See Failure Data)
Operator X
Other (specify)
.l The instrument technician misunderstood the requirements for leak testing of the escape hatch.
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Analysis of Occurrence:
The Reactor Building Escape Hatch was immediately retested and found to be acceptable, therefore, there was no ha::ard to the health and safety of the public.
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Reportable Occurrence' Report No.
50-313/77-10 10.
Corrective Action:
T' a cavity between the doors was leak checked at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on
.._Macch 31, 1977, and found to be acceptable.
..The importance of a proper leak rate check has been reemphasized to the plant personnel involved in performing this test.
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Failure Data:
There has been no other reportable occurrence reported by the Instrumentation and Control group as a result of the failure to perfo m a surveillance test at the required frequency.
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