ML20028F377
| ML20028F377 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 01/19/1983 |
| From: | Midura H Public Service Enterprise Group |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20028F378 | List: |
| References | |
| NUDOCS 8302010303 | |
| Download: ML20028F377 (3) | |
Text
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O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station January 19, 1983 Mr. R. C. Haynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Haynes:
LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-156/03L 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 82-156/03L. This report is required within thirty (30) days of the occurrence.
Sincerely yours, 7
4 ,%/ Ie ~
H. J. Midura General Manager -
Salem Operations RF:ks CC: Distribution i
l 8302010303 830119 I PDR ADOCK 05000311
\ S PDR The Energy People je 99-2189 (20M) 11-81 u
keportNumber: 82-156/03L Report Date: 01-19-83 Occurrence Date: 12-29-82 Facility: Salem Generating Station Unit 2 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:
Reactor Trip System - No. 23 Reactor Coolant Loop Flow Channel III -
This report was initiated by Incident Report 82-526.
CONDITIONS PRIOR TO OCCURRENCE:
Mode 1 - RX Power 65 % - Unit Load 690 MWe.
REECRIPTION OF OCCURRENCE:
At 1640 hours0.019 days <br />0.456 hours <br />0.00271 weeks <br />6.2402e-4 months <br />, December 29, 1982, the Control Room Operator noticed that No. 23 Reactor Coolant Loop Flow Channel III was reading erratically. The channel was declared inoperable, and since it is utilized in the Loss of Flow trip, Technical Specification Limiting Condition for Operation 3.3.1 Action 7 was entered. The bistables associated with the channel were placed in the tripped condition at 1732 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.59026e-4 months <br />; redundant reactor coolant flow channels were operable throughout the occurrence.
APPARENT CAUSE OF OCCURRENCE:
Investigation revealed that the flow transmitter output was oscillating excessively. The transmitter had been recently replaced as the result of a similar problem with the instrument (See LER 82-069/03L). It was therefore concluded that the erratic operation may be due to a plugged sensing line. The sensing lines were backflushed, and the channel was satisfactorily recalibrated. No further problems have been noted to date, in support of the conclusion.
ANALYSIS OF OCCURRENCE:
The loss of flow trip function initiates an automatic reactor trip to prevent DNB in the event of the loss of one or more reactor coolant pumps. Operability of the reactor trip and engineered safety feature instrumentation systems is required to provide the overall reliability, redundancy and diversity assumed available in the facility design for the mitigation of accidents. Integrated operation of the systems is consistent with assumptions used in the FSAR.
Since the redundant channels were operable, the incident involved no risk to the health and safety of the public. Due to the loss of redundancy, the occurrence constituted operation in a degraded mode
LER 82-156/03L '
NALYSIS OF OCCURRENCE: (cont'd) permitted by a limiting condition for operation. .The event is therefore reportable in accordance with Technical Specification 6.9.1.9b.
Limiting Condition for Operation 3.3.1 Action 7 requires:
With the number of operable channels one less than the total' number of channels, power operation may proceed until performance-of the next required channel functional test provided the inoperable channel is placed in the tripped condition within 1-hour.
CORRECTIVE ACTION:
As noted, the bistables associated with the channel were tripped, in compliance with the action statement. Following backflushing and recalibration of the transmitter the channel operated satisfactorily.
It was declared operable at 1531 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.825455e-4 months <br />, January 6, 1983, and Limiting Condition for Operation 3.3.1 Action 7 was terminated. The occasional plugging of transmitter sensing lines is not abnormal; no further action was deemed necessary in view of the apparent nature of the problem.
FAILURE DATA:
Not Applicable Prepared By R. Frahm [ b C Gene'ral Manager -
Salem Operations SORC Meeting No. 83-05
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