ML19320A169

RO 50-313/76-16:on 760712,sodium Thiosulfate Tank T-9 Found Below 37,500 Lb Tech Specs Limit.Caused by Suspected Leak Into Reactor Bldg Spray Sys.Addl Sodium Thiosulfate (956 Lb) Added on 760713.Efforts Made to Reduce Leakage

ML19320A169
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/03/1976
From:	Mardis D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A166	List: ML19320A165 ML19320A168 ML19320A169 ML19320A175
References
NUDOCS 8004210475
Download: ML19320A169 (4)

Text

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1. Reportahic Occurrence Report ik . 50-313/76-16

2. Report Dato: 8/3/76 .. h irrence Inste: 7/12/76 4 Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification of Occurrence:

T-9 was below the 37,500 lb. Na2 S02 3 limit per Tech. Spec. 3.3.4B.

6. Conditions Prior to Occurrence:

I Steady-State Power X Reactor Power 2S17 MWth Ilot Standby Net Output 809 MWe I

Cold Shutdown Percent of Full Power 98 's i

Refueling Shutdown Load Changes During Routine Power Operation i Routine Startup .

i_ Operation

Routine Shutdown Operation Other (specify) s t

7. Description of Occurrenec:

At 0905 hours0.0105 days <br />0.251 hours <br />0.0015 weeks <br />3.443525e-4 months <br /> on July 12, 1976, a. sample was taken from the Sodium Thiosulfate Tank (T-9) . A'n analysis found T-9 to be below the 37,500 lb. .

sodium thiosulfate limit. '

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l O . Attachuent "C" i '-  !'. arch 23, 1976 NSP-In. Rev. 4 Page 2 of 4

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Reportable' Occurrence Peport No. 50-313/76-16

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8. Desip, nation' of Apparent Cause _of Occurrenec:

j Design Procedurc Flanufacture Unusual Service Condition lucluding Environmental Installation / ,

Construction Component Failurc Operator 1

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Other (specify) X Suspecting a leak from T-9 into the Reactor Building Spray System.

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9. Analysis of Occurrence:

Since more so .um thiosulfate was added and 37,500 lbs. is a conservative estimate, tb .e was n.) effect on the health and safety of the public.

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\ Attachiwnt "C" l l hhrch 23, 1976 NSP-10, Rev. 4 Page 3 of 1 l

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Reportable Occurrence Report iio. 50-313/76-16 4

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10. Corrective Action:

On July 13, 1976. 056 lbs of sodium thiosulfate was added to T-9.

I Efforts are being made, including lapping of the isolation valves, to reduce this leakage.

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11. Failure Data:

None.

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/st taciunent "C" Sbrch 23,1976 NSP-10, Rev. ' 4 ' Page .1 of .1 4

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