ML19326C070
| ML19326C070 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/24/1976 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326C067 | List: |
| References | |
| NUDOCS 8004180741 | |
| Download: ML19326C070 (5) | |
Text
LICENSEE EVENT REPORr m
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Henort alele occurr ence 1:cpoj,,t, Q, a-313/76-11.
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Ry ort lute:
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June 25, 1976 June 12, 1976 4
Iaci1ity: Arkansas Nuclear One - Unit 1 Russellville, Arkansas 5.
_Identi fication o f Occurrence:
Radioactive liquid spill.
6 Conditions Prior to Occurrence:
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Steady-State l'ower _
Reactor Power 0
mth llot Standby Net Outin2t 0
Mc Cold Shutdown X
Percent o f I ull l'ower 0
'e Refueling Shutdown Load Changes During Routine
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Power Operat ion j
Routine Startup
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Operation
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Routine Shutdown Operation Other (specify) s 7.
11cseription of Occurrence:
At approximately 2330 hrs. on 6-12-76'it was discovered that liquid was overflowing from the open manway of the sodium thiosulfate tank. The tank manway was open following the addition and mixing of sodium thio-sulfate to the tank. Since concentrations in the sodium thiosulfate tank were,Seing adjusted, the high icvel alarm had actuated prior to the overflow but the open manway of the tank was not under observation.
The t:.nk was isolated by 0010 hr. on 6-13-76 and an investigation began to determine the cause of the tank overflow.
It was determined that approximately 9500 gal. of liquid containing 0.262 curies were spilled by way of the borated water recirculating pump which was in service circulating the BWST for clean up purposes following drain down of the y
fuel transfer canal. The normal means of filling the sodium thiosulfate is from the condensate transfer pump; but due to a common discharge for the condensate transfer pump and the borated water recirculating pump, water attachuent "C"
!! arch 23, 1976 NSP-10 Rev. 4 PaMC 2 ef 4
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Description of Occurrence (cont'd):
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'was added to-the sodium thiosulfate tank by the recirculating pump by mistake.
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Of the 9500 gal. spilled, the quantity that was not absorbed by the soil j.
in-the vicinity of the tank reached Lake Dardai:elle by way of a storm j
drain which discharges into the plant discharge canal.
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~ Attachment "C" l:-
March-23, 1976
-NSP-10,-Rev. 4 Page 2a of 4 I '
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.iterortable occurre.nce I:cport No.
50 ~.3/76-13 l.,-
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- 8. 'llesignation of ApparciLCause of (kcitrrence:
Design Procedure
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flanu fac t ure Unusual Service Condition including linvi rnnmentaI installation /
j-Construction.
Component Failure 4
Operator Other (speciT 4 The procedure used in filling the-tank was not sufficient in that it did not - require shutting down the borated water recirculating pump and closing valve No. SF-22 prior to adding condensate to the sodium j
thiosulfate' tank through valves CS-73 5 CS-75.
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9.
Analysis 'of Occurrence:
Since samples taken in the discharge canal when concentrations were at-or near a peak verified the levels of radioactivity were below detection linits and the sodium thiosulfate concentration was at or below the detection level associated with normal river water (and thus below a level of a significant environmental impact), there was no ha::ard to the i
health and safety of the public. After adjusting 10 CFR 20, Appendix B, Table I limits to account for the period of. release (10 CFR 20.103) and 8
averaging the release -to unrestricted areas over the period June 1 thru June 22 (10 CFR 20.106), no 10 CFR 20 limits were exceeded.
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Page 3 Of 4
. Attachment "(."
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- Reportalsle occurrence Report do.
50 ';i/76-11 10.
Corrective Action:
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A procedure is being written whici requires shutdown of the borated water recirculating pump and closing of valve no. SF-22 prior to adding conden-sate to the sodium thiosulfate and sodium hydroxide tanks. The precedure will also require acknowledgemenit of the tank's high level alarm or posi-tioning of an observer near the tank when filling with the manway open.
A design change is also under review'which will allow condensate to be
.added selectively to these tanks.
l West. of the se.curity fence four to twelve inches of top soil (approximately 2000 cu.ft.) were scraped up and placed into barrels. New topsoil has been placed to restore the ground to its original contour. A small dike has been erected around the affected area inside the security fence to retain sur-face water runoff until the area inside and outside the security fence can be surfaced with concrete and/or asphalt.
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Failure Data:
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None.
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NSP-10, key. 4 Page a of a ist ta chment -"C" Stirch. 23, 1976
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