ML19326B853
| ML19326B853 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/27/1976 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B844 | List: |
| References | |
| NUDOCS 8004180590 | |
| Download: ML19326B853 (4) | |
Text
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('O 1-Reportabic Occurrence Report No. 50-313/76-25 2.
Report Date: 9/27/76 3.
Occurrence Date: 8/31/76 4
Facility:
Arkansa? Nuclear One-Unit 1 Rursellv11.a, Arkansas 5.
Identification of Occurrence:
Leak in "B" decay heat discharge line.
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Conditions Prior to Occurrence:
Steady-State Power Reactor Power 0
MWth llot Standby Not Output 0
MWe i
Cold Shutdown X
Percent of Full Power 0
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Refueling Shutdown Load Changes During Routine Power Operation i
Routine Startup i.
Operation Routine Shutdown
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Operation
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Other (specify) 7.
Description of Occurrence:
At 0420 hours0.00486 days <br />0.117 hours <br />6.944444e-4 weeks <br />1.5981e-4 months <br /> on 8/31/76, an approximate 2 gpm leak was discovered in the heat affected zone of the boss to line weld for DH-1019.
The crack was in the 10" discharge line downstream of decay heat.
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Attachuent "C" l
!! arch 23,1976 NSP-10, Rev. 4 Page 2 of 4 1
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Reportable Occurrence Report No.
50-313/76-25
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8.
Designation of Apparent Cause ol' Occurrence:
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Design Procedurc Manufacture Unusual Service Condition including Environmental Installation /
Construction Component Failure Operator Other (specify)
X The probable cause of the crack was excessive vibration.
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Analysis of Occurrence:
The leak was confined to the Reactor Auxiliary Building; hence, there wa._no hazard to the health and safety of the public.
Attachment "C" March 23, 1976 NSP-10, Rev. 4 Page 3Of4 l
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Reportable Occurrence Report iio.
50-313/70-25 10.
Corrective Action:
The repair was made by removing r. 2 ft. section of the schedule 10.p.iping and replacing with new section.
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11.
Failure Data:
Cracked welds reported in Reportable Occurrence Report 50-313/74-2, 76-10, and 76-24.
Section of pipe had same heat number of 800201.
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