05000311/LER-1981-071, Forwards LER 81-071/03L-0.Detailed Event Analysis Encl
| ML20030D532 | |
| Person / Time | |
|---|---|
| Site: | Salem, 05003118  |
| Issue date: | 08/21/1981 |
| From: | Midura H Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20030D533 | List: |
| References | |
| NUDOCS 8109010500 | |
| Download: ML20030D532 (3) | |
| Event date: | |
|---|---|
| Report date: | |
| 3111981071R00 - NRC Website | |
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L6A O PSEG Public Service Electric and Gas Company P.O. Box 168 Hancocks Bridge, New Jersey 08038 Salem Generating Station August 21, 1981 j@44T4,',x y#'t Mr. Boyce H.
Grier
.Q Director of USNRC [d) 7q Office of Inspection and Enforcement N
1
.. 'b Region 1 631 Park Avenue 9
l' King of Prussia, Pennsylvania 19406
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Dear Mr. Grier:
j LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 81-71/03L Pursuant to the requirements of Salem Generating Station Unit No. 2 Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 81-71/03L.
This report is required within thirty (30) days of the occurrence.
Sincerely yours, Js/
hl b s44 H.
J.
Midura Manager -
Salem Generating Station CC:
R.
A.
Uderitz General Manager - Nuclear Production Director, Office of Inspection and Enforcement (30 copies)
Director, Office of Managenent jp Information and Program Control 3
(3 copies) j
//l 8109010500 810821 FDR ADOCK 05000311 S
PDR The Energy People 9s2iew2m n e
Report Number:
81-71/03L Report Date:
Occurrence Date:
7-23-81, 7-24-81 and 7-25-81 Facility:
Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:
Electrical Distribution System - No. 22 CSD Breaker - Unidentified Trips.
This report was initiated by Incident Reports81-271, 81-272,81-276, 81-281 and 81-287.
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CONDITIONS PRIOR TO OCCURR2NCE:
7-23-81 Mode 1 - Rx Power 21% - Unit Load 160 MWe 7-23-81 Mode 1 - Rx Power 25% - Unit Load 200 MWe 7-24-81 Mode 1 - Rx Power 48% - Unit Load 440 MWe 7-24-81 Mode 1 - Rx Power 46% - Unit Load 440 MWe 7-25-81 Mode 2 - Rx Power 0% - Unit Load 0 MWe i
DESCRIPTION OF OCCURRENCE:
On five separate occasions on July 23, July 24, and July 25, 1981, No. 22 CSD breaker tripped from an unidentified cause.
There were no indicating flags showing on the relays.
No. 21 CSD breaker was closed manually.
Action statement 3.8.2.1.a was entered at 1614 and 1803 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.860415e-4 months <br />, July 23, 1211 and 1805 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.868025e-4 months <br />, July 24, and 1624 hours0.0188 days <br />0.451 hours <br />0.00269 weeks <br />6.17932e-4 months <br />, July 25, 1981.
This occurrence constituted operation in a degraded mode in accord-ance with technical specification 6.9.1.9.b.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
The cause of the breaker trips is still und'etermined.
It is suspected that the cause of this, and possibly other problems, is in the safe-guards equipment cabinet (SEC).
The entire chassis of the SEC has been changed several times with no positive results.
Numerour tests, investigatiot, and manufacturer's consultations were conducted.
At the date of this report, the possibility of a signal being induced into the circuit by the No. 22 primary water make-up pump, modifying the 15 volt logic voltage, is being investigated.
ANALYSIS OF OCCURRENCE:
Technical specification 3.8.2.1.a requires:
With less than the stated complement of A.C. busses operable or energized, restore the inoperable busses to sperable and energized status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at lea.st hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
d LER 81-71/03L CORRECTIVE ACTION:
The cause of the breaker trips is still under investigation.
The immediate action in each of the five occurrences was to manually close the No. 21 CSD breaker.
At 1624 and 1805 hours0.0209 days <br />0.501 hours <br />0.00298 weeks <br />6.868025e-4 months <br />, July 23, 1222 and 1813 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.898465e-4 months <br />, July 24, and 1625 hours0.0188 days <br />0.451 hours <br />0.00269 weeks <br />6.183125e-4 months <br />, July 25, 1981, respectively, action statement 3.8.2.1.a was terminated.
A supplemental report will be issued when the investigation is completed.
FAILURE DATA:
4 Not Applicable
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Prepared By F.
Dickey
/
i Manager - Salem Generating Station SORC Meeting No.
81-79 W
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