ML19317G687
| ML19317G687 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/21/1978 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML19317G688 | List: |
| References | |
| NUDOCS 8003250831 | |
| Download: ML19317G687 (1) | |
Text
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SACRAMENTO Mut!!CIPAL UTILITY DISTRICT C 6201 S Street. Box 15830. Sacramento. California 9'A13; (916) 452 3211 I
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April 21, 1978
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Director of Regulatory Operations a
Attention:
Mr. R. H. Engelken D.
NRC Operations Office, Region V d
1990 North California Boulevard
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Walnut Creek Plaza, Suite 202 F
Walnut Creek, California 94596 7
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O" Re: Operating License ^DPR-54 G
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Docket No. 50-312 Unusual Event 78-2
Dear Mr. Engelken:
In accordance with Technical Specifications for the Rancho Seco Nuclear Generpting Station, Appendix B, Section 5.6.2C, the Sacramento Municipal Utility Distride' hereby submits the following wra.cr.en report concerning Unusual Event 78-2.
Plant effluent discharge chlorine lim ts are established by Technical Specifica-tions, Appendix 3, Saction 2.2 at a =au u:2 of 0.2 eg/ liter. The limit has been
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(V) established for samples measured at. the discharge fro:t the site boundary.
On 3
April 14 the 1315 sa=ple at the mixing weir indicat~' 3.9 mg/L and 4-adiate procedural steps were undertaken to determine if the offsite limits of 0.20 mg/L were being exceeded. As an anticipatorf action the dilution flow at the weir.
was increased an additional 1000 gpm and the incoming effluent was diverted to 1
the retention basin. The sample obtained and analyzed at the site boundary at 1350 indicated the total chlorine to be 0.24 mg/L, exceeding the limit by 0.04 og/L. The dilution flow was increased to 3000 gpm. A site boundary sa=ple[at 1420 showed the total chlorine had decreased to 0.06 ng/L.
The investigation concluded that during the fill of the Hypochlorite Chemical Tank for the East Nuclear Service Spray Pond, one gallon of Hypochlorite was spilled and flushed to the drain system. To prevent recurrence of this event, the fill lina from the tank truck will be capped prior to removal f cm the Hypochlorite Tank.
All excess Hypochlorite will be discharged into the Spray Pond from the fill line.
There was no plant transient or shutdown associated with this event.
Respectfully submitted, b
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Mattimoe
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N Assistant General Manager
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and Chief Engineer d
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AN. ELECTRIC SYSTEM S E RVIN G MORE T il A N 600.000 l 'I THE HEART OF C A LI FO R N I A