ML19309A674
| ML19309A674 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 03/05/1976 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML19309A670 | List: |
| References | |
| NUDOCS 8003310647 | |
| Download: ML19309A674 (2) | |
Text
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n SACRAf. LENTO MUNICIPAL UTILITY DISTRICT C) 1708 59th Street. Box 15830. S.
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United States Nuclear Regulatory Commission Region V Suite' 202, Walnut Creek Plaza 1990 N. California Boulevard Walnut Creek, California 94596 Attention:
Mr. R. H. Engelken Director Centlemen:
This letter refers to the inspection conducted January 26 - 29 and February 2,1976, by Mr. F. Wenslawski of your Fuel Facilities and Material Safety Branch.
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In reply to your notice of a deficiency stated in your 1cteer received
\\d by us on February 19, 1976, the District is taking th'e following corrective actions.
The instrum'entation stated in your letter is the installed liquid effluent temperature recorder TR 95107. The recording range of this instru-ment was 50 to 100 F.
During the period in question (January / February) the power plant was in a shutdown mode and the recorder was indicating the lower limit (500F).
Considering the plant conditions and the environmental condi-tions for that season, the recorder indications seemed reasonable. The recorded values became suspect on January 26 when a Technician analyzed a laboratory sample which was greater than 50 F and the review of the recorder chart indicated less than 500F.
The supervisor discovered the difference and ordered a calibration check of the temperature instrumentation.
Subse-quent investigation revealed that the millivolt converter had failed and was the cause of the downscale reading on the recorder. The converter was replaced and. the system was operational January 28, 1976. Appendix B to the Technical Specifications Section 2.1 requires manual or other alternate instrumentation to be used for temperature monitoring when the original equipment becomes inoperative.
Since the system was suspect and not proven inoperable during the initial checks the alternate temperature monitoring program was not initiated.
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v AN ELECTRIC SYSTEM SERVING MORE IHAN 600.003 IN THE HEART OF CAttfCRN'A
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Mr. R. H. Engelken March 5, 1976 To pre -
Tecurrence of this problem, the District has informed the personnel that compliance with Section 2.1 of the Technical Specifications Appendix B will be complied with for future operations. The temperature recording scale of TR 95107 was changed to indicate from 0 to 200 F.
Any failure of the equipment will indicate obvious errors and corrective action can be taken immediately. A new recorder with a temperature scale from 320F'to 1220F has been ordered to replace the local readout unit that will be used in the Control Room area, which will increase the monitoring efficiency and inspection capabilities of the Technicians. The new system is part of I
the revision to the Retention Basin-modification and will be installed when received.
With the above corrections taken, the District does not feel that there will be a recurrence of this event.
Respectfully, (2
~A J. J. Mattimoe j
Assistant General Manager i
and Chief Engineer 1
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R.J. Rodriguez L.G. Schwieger D.G. Raasch QA Files
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