ML20035D654
| ML20035D654 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/08/1993 |
| From: | Marsh W SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9304130377 | |
| Download: ML20035D654 (1) | |
Text
.o Southern Cahtornia Edison Company 23 PARKER STRE ET 1RVINE, cal tF ORN6A 92718 Pril 8, 1993 yy g,,,,
WALTER C MARSH AS$tST AN' M AN AGE A 171 e ) 454 4403 NUCL E AA AE GUL A1DRv Ar F Aiks l
U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555 l
l
Subject:
Docket No. 50-361 and 50-362 l
Special Report - Meteorological Instrumentation Status San Onofre Nuclear Generating Station, Unit 2 and 3
Reference:
Letter, W. C. Marsh (SCE) to U.S. NRC Document Control Desk, March 11, 1993 j
The referenced letter reported the inoperability of the secondary channel of delta temperature meteorological instrumentation.
As described in the prior submittal, the cause of the inoperability had not been determined because of the intermittent nature of the failure.
This letter supplements the prior report by providing the present status of the instrumentation, and the cause and corrective action for the instrumentation failure.
The secondary delta temperature instrument was returned to service on March l
22, 1993 at 1228. The cause of the intermittent faulty indication was identified as an improper connection between the signal wire and a terminal connector lug.
Inspection of the lug identified that it had been improperly crimped when originally installed.
The terminal connector lug was replaced, correcting the discrepancy between the seccidary and primary delta temperature indications.
An inspection of the remaining terminal connectors on both channels of the delta temperature instrumentation found no other improper terminal connections.
During the period of inoperability of the secondary channel of delta temperature, the primary channel remained operable and provided accurate stability class data.
If you require any additional information, please let me know.
Sincerely, Al Sh cc:
J. B. Martin, Regional Administrator, NRC Region V M. B. Fields, NRC Project Manager, San Gnofre Units 2 and 3 C. W. Caldwell, NRC Senior Resident Inspector, San Onofre Units 1, 2 & 3 9304130377 930408 PDR ADOCK 05000361 g
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