ML19317F824
| ML19317F824 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/16/1975 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19317F825 | List: |
| References | |
| NUDOCS 8002210576 | |
| Download: ML19317F824 (2) | |
Text
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I SMUD f
SACRAMENTb MUNICIPAL UTILITY DISTRICT. C 620 S Street, Box 15830. Sacramento, C.lifornia 95813: (916) 452-3211 j
%J April 16, 1975 Director Division of Reactor Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20545 Re: Operating License DPR-54 Docket No. 50-312 Rancho Seco Nuclear Gene ating Station Unit No. 1 Abnormal Occurrence No. 75-7
Dear Sir:
As defined by Proposed Amendnent No. 30 to Technical Speciffcations.
/
for the Rancho Seco Nuclear Power Station, Section 6.9.1, and Regulatory Guide 1.16, Rev. 3, Section C.2.b. (2), we are reporting the following Abnormal Occurrence as A0-75-7.
O On March 19, 1975, operations acrsonnel were concentrating reactor
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coolant to recover the b6ric' acid from the solution. The concentrate from the Boric Acid Evaporator is stored in the Concentrated Boric Acid Storage i
Tank. Initially the tank had a volume of 10,000 gallons of 7881 ppn boron which is'within the Technical Specification Section 3.'.3 maximum 11 nit of 8500 ppe boron. When the concentr.,tc fron the Boric Acid Evaporator, which is approximately 12,300 ppm boron, was added to the Concentrated Doric Acid i Storage Tank, the boron concentration wan-increased to 3610 ppa horon.* The.
1 error was discovered chortly af ter the addition by nampling the CBAST. Three hundred and forty-five gallons of domineralized wter was added to return the CB.\\ST to the Technical Specification requircecnts." This was done within two hours of the occurrence.
The maximum limit was established to' prevent baron precipitation at the minimum permissible solution temperature of 70*F.
The measured temperature of the BWST during this occurrence uss ll5'F.
At ll5'F the boron concentration would have to exceed 16,500 ppa before boron could precipitate out of solution.
During this. occurrence the boron remained 11 solution and was available for injection if required.
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To prevent reoccurrence of this event, the operations personnel will be instruct.ed to sanple.and calculate the resultant B"ST boron concentration after additions as. required in the operating orocedures. The operators will i
attend a retraining review of the procedures and the use of the calculations u
necessary to properly perforn additions to the BWST without exceeding the d'
Technical Specifications.
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8002 210 67d
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A N ' E L E C T R I C ' S Y S T E At ' t E R v t N G~ MORE.THAN ~ 600.000 IN THE. HEART OF C A LIF O R N I A
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.' Director.
Division of Reactor Licensing April-16, 1975 i
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We feel that if the aforementioned retraining is-accomplished, the-l operability of the BWST will be assured and a reoccurrence of this event' 4
.will be-prevented.
i There was no reactor transient associated with this Abnormal' Occurrence.
Respectfully,
?
/WM l
J. J. Mattince Assistant General Manager d'
and Chief Engineer t
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Enclosure-cc:. R. H. Engelken,-Region V e*
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