ML19319E541

RO 50-313/76-34:on 761201,valve SF-10 in Spent Fuel Cooling Sys Leaked.Caused by Crack in Heat Affected Zone of Valve SF-11.Valve SF-11 Will Be Replaced

ML19319E541
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/30/1976
From:	Mardis D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E539	List: ML19319E538 ML19319E541
References
NUDOCS 8004110804
Download: ML19319E541 (4)

Text

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- 1. Reportabic Occurrence Report No. 50-313/76-34

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2. Report Date: 12/30/76 3. Occurrence Date: 12/1/76 4 Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas i

S. Identification of Occurrence: .

Water leakage from valve in spent fuel cooling system.

6. Conditions Prior to Occurrence:

Steady-State Power X Re~ actor Power 2542 MWth Hot Standby Net Output 829 Mwe Cold Shutdown Percent of Full Power 99  %

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U Refueling Shutdown Load Changes During Routine Power Operation Routine Startup Operation Routine Shutdown Qeration ,,

Other (specify) ,

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7. Description of Occurrence: ,

At 1715 hours0.0198 days <br />0.476 hours <br />0.00284 weeks <br />6.525575e-4 months <br /> on December 1,1976, leakage was discovered on a weld -

downstream of Valve SF-10 between the valve and a T-section. Cause of the leakage appeared to be a small crack in the weld. A dye-penetrant ,

j test of the T-section area revealed no penetrating cracks. It was then l thought that the Icakage may have come from above on Valve SF-11. A dye-penetrant test revealed a crack in the heat affected zone of Valve SF-11. ,

O NSI4III-2, Rev. S Attachment "D" 5 October 1, 1976 Page 2 of 4

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, . m Reportable Occurrence Report No. 50-313/76-34 4

8. Designation of Apparent Cause of Occurrence:

Design Procedure Manufacture Unusual Service Condition Including Environmental ,

Installation /

Construction , Component Failure (See Failure Data) 5 Operator _

Other (specify) X Unknown I

9. Analysis of Occurrence:

Since the leakage was only a minute amo'unt and was contained in a controlled area, there was no hazard to the health.and safety of the public. 5 i

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October 1, 1976 NSP-III-2, Rev. 5 Attachment "D" 5

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Reportable Occurrence Report No. 50-313/76-34 s 4

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10. Corrective Action: >

C' After a dye-penetrant test was perfomed on the T-section area of f f, ' ' ,, .

Valve SF-10 and no penetrating cracks were found, a dye-penetrant' teg .i- -- - >

revealed a' crack in the body of Valve SF-11. Valve SF-11 will

be '

replaced. .

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11. Failure Data:

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October 1, 1976 NSP-III-2, Rev. 5 Attachinent "D" 5 i

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