ML19319E457

AO-50-313/75-8:on 751101,leak Found in Schedule 10,6 Inch Line from Borated Water Storage Tank to P36A Makeup Pump. Cause Unknown.Two Ft Spool Piece Removed from Affected Area & Replaced.Spool Piece to Receive Metallurgical Exam

ML19319E457
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/11/1975
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E450	List: ML19319E449 ML19319E457
References
NUDOCS 8004100731
Download: ML19319E457 (4)

Text

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7 09 80 LOSS OR DAMAGE TO FACILITY TvPE DESCn, Pron 3 LZj l NA l 7 89 10 80 PUGUCITY 17 l Mh l 7 89 _ ___

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1. ' Abnormal Occurrence Report No. 50-313/75-8

. 2. Report Date: November 11, 1975 3. Occurrence Date: November 1, 1975

~4 Facility: Arkansas Nuclear One-Unit 1 Russellville,. Arkansas p 5.- Identification of Occurrence:

f.cak in 6" suction from !!WST to P36A Makeup Pump.

6. Conditions' Prior to Occurrence:

f

Steady-State Power Reactor Power 0- MWth ilot Standby Net Output 0 MWe Cold Shutdown X Percent of Full Power 0  %

~ Refueling Shutdown I,oad Changes During Routine Power Operation

, Routine Startup l ~~ Operation

_ Routine Shutdown i Operation 1

Other (specify) ,

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. . 7. Description of Occurrence: ~;

'At approximately 2400 hours0.0278 days <br />0.667 hours <br />0.00397 weeks <br />9.132e-4 months <br /> on 11/1/75 a leak was discovered in the-Schedule 10, 6" line from the BWST to P36A Makeup Pump. Leak was

- -located approximately 1/2" from the reducer to pipe weld, 14" pipe to '~

. 6'.'_ pipe on the pipe side .of the weld. The affected area was radio-- -

graphed and showed no evidence of a crack; however it did indicate -

pitting.

t L MaEch 4,'1975; NSP-10', Rev. 2 Page 2 of 4 p

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$ - Abnormal Occurrence Report No. 50-313/75-8

j. 8. Designation of Apparent Cause of Occurrence: -

i j Design. Procedure i 1

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[ Minufacturo Unusual Service Condition i Ineiuding linvi ronmental - H

Installation /f ,

!' Construction Component Failure Operator X

0ther (specify) .  !

Cause is unknown at this time.

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9. Analysis of Occurrence:

i i At the -time of the occurrence the plant was in. a cold shutdown condition F*- , ' and .was not required -to be operable; therefore, there was no hazard to ,

the health and safety of the public. ,i r

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March 4, Id75 .NSP-10,^Rev. 2 Page 3 Of 4 .1

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Abnormal Occurrence Report No. 50-313/75-8

10. Corrective Action:

A spool piece has been removed from the affected area of pipe approximately two feet long and replaced. Two welds immediately downstream of the leak were radiographed and showed no evidence of pitting; therefore it appears this is an isolated case. The spool piece will receive metallurgical examination to determine the cause and to determine if additional investi- '

gation or corrective measures are necessary:

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\ 11. Failure Data:

No previous apparent failure of this type has occurred.

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hbre., 4, 1975 NSP-10, !tev. 2 Page 4 or 4

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