ML20081K672
| ML20081K672 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 10/11/1983 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, SDR-85, NUDOCS 8311100233 | |
| Download: ML20081K672 (2) | |
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9 PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 (2151841-4502 OCT 111983
..a -.m.,e ENGINE E R8hGo AND RESE ARCM Mr. Thomas E. Murley, Director United States Nuclear Regulatory Commission Office of Inspection and Enforcement, Region I 631 Park Avenue King of Prussia, PA 19406
Subject:
Significant Deficiency Report #85 Interim Report on Possible Operational Deficiency in Reactor Water Cleanup System Isolation Valve Control Circuit Limerick Generating Station, Units 1 and 2 NRC Construction Permits Nos. CPPR-306 & 107
REFERENCE:
Telecon of September 12, 1983, G.
R. Hutt (PECO) to W. Baunach (USNRC)
FILE: QUAL 2-10-2 (SDR #85)
Dear Mr. Murley:
In compliance with 10CFR50. 55 (e), enclosed is an interim report on the subject potential deficiency.
A telephone report was previously submitted to your office by PECO in the above referenced telecon.
Our evaluation of reportibility is continuing and we expect to be able to submit a determination report by November 18, 1983.
Sincerely, Nb B
Copy to: Director of Inspection and Enforcement United States Nuclear Regulatory Commission Washington, D.C.
20555 S. K. Chaudhary, Resident NRC Inspector (Limerick)
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8311100233 831011 PDR ADOCK 05000352 S
PDR i
o Limerick Generating Station Units 1 and 2 Interim Potential Significant Deficiency Report #85 Potential Defect in Isolation Valves Control Circuits in Reactor Water Cleanup System 1.0 Introduction This is an interim report regarding a possible significant deficiency on isolation valves operation in the Reactor Water Cleanup System (RWCU).
An initial notification was submitted to the U.S.N.R.C. by telephone on September 12, 1983.
2.0 Description of Problem During preoperational testing, the inboard and outboard isolation valves (HV44-lF001 and HV44-lF004) on the RWCU were found to operate improperly.
The valve motors trip their breakers if they are reversed while opening the valve.
This motor reversal can occur when an emergency close signal is received during a valve opening operation.
3.0 Determination of Reportability The circuit breakers for the valve motor operators are presently calibrateo to trip at 165 amperes.
The maximum possible current setting is 190 amperes.
When access for testing the breakers for the two isolation valves is obtained, the effect of increasing the current settings will be determined.
If the breaker tripping cannot be corrected by adjustment of the trip setting, then redesign of the control circuit or breaker replacement will be required.
A determination of reportability for this deficiency will be made at that time.
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