ML19317F813
| ML19317F813 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/15/1975 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19317F814 | List: |
| References | |
| NUDOCS 8002210570 | |
| Download: ML19317F813 (1) | |
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SACRAMENTO MUNICIPAL UTILITY DISTRICT C 1708 59th Street Box 15830, Sacramerito. California 95813;(916)452 3211 July 15, 1975 4
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Director
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Division of Reactor Licensing vul221975
- U. S. Nuclear Regulatory Commission
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Washington, D. C.
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-Q Re: Operating License DPR-54 I p\\
Docket No. 50-312 Unusual Event 75-6
Dear Sir:
As defined by Technical Specifications " Appendix B",
Section 2.6.2.C, we are reporting the following Unusual Event as UE 75-6.
On May 5, May 16, May 23, and May 26, it has been noted that the conductivity of the effluent waste water exceeded that
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associated with a total dissolved solids level of 850 mg/1, the d
limit set in Technical Specifications " Appendix B", Section 2.3.A.
e These events were very brief spikes which appeared as the controlled dU.ution for a retention basin release was being established. On May 27 the limit was again exceeded; however, on this occasion the dissolved solids level remained at approximately 1600 mg/l for fifteen minutes, and no retention basin release was noted.
It has been found that the conductivity sensing system
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overreacts somewhat to conductivity changes, and upon releasing the retention basin and adjusting the dilution flow the meter records a spike. To correct this the system will be desensitized, so as not to record an invalid high conductivity level. There is nc apparent reason for the 15-minute indication. Records show no release which would give such a reading at that time, the instrumentation has been checked and is operating properly, and no calibration checks were being performed en the instrument at that time.
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There was no plant transient associated with this event.
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,/ } ' g, Respectfully.
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. Mattimoe
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/N Assistant General Manager
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and Chief Engineer
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cc: R. H. Engelken, Region V
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SWY BDIT REGION-m AN ELECTRIC SYSTEM SERVING MORE THAM 600.000 IN.THE HEART OF CALIFORNIA