ML20212P713
| ML20212P713 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/09/1987 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8703160212 | |
| Download: ML20212P713 (2) | |
Text
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DUKE POWER GOMPANY v.o. nox saiso CHAMLoTTE, N.C. 28242 HALH. TUCKER T
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NIEE,RAE PapanETEON March 9, 1987 U.S. Nuclear Regulatory Comunission Document Control Desk Washington, D.C.
20555
Subject:
Oconee Nuclear Station IE Inspection Report 50-269, -270. -287/86-33 Gentlemen:
In response to the subject Notice of Violation dated February 5,1987, the cttached response to the cited item of non-compliance is provided.
Very truly yours, fb l lh Hal B. Tucker j
PJN/133/jgm xc:
Mr. J.C. Bryant NRC Resident Inspector Oconee Nuclear Station Dr. J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission - Region II 101 Marietta Street, NW, Suite 2900 Atlanta, GA.
30323 f0l 9
8703160212 870309 i
PDR ADOCK C5000269 0
V VIOLATION (#269,270,287/86-33),
SEVERITY LEVEL (IV)
- 1. Admission or denial of the alleged violation:
Duke Power Company agrees with the subject violation as stated.
- 2. Reason for violation:
The root cause of this incident was the inadequate design and testing of the Emergency Condenser Cooling Water (ECCW) System.
The design of the ECCW Siphon proved to be inadequate due to air inleakage through the pump discharge flanges which vented the siphon.
The testing of the ECCW Siphon proved inadequate because it failed to detect the inadequate design of the siphon.
- 3. The corrective steps which have been taken and the results achieved:
- a. The Condenser Cooling Water (CCW) pump discharge casing flanges were modified to eliminate air inleakage during the CCW Siphon operation.
Testing verified that the sealing modification successfully eliminated the air inleakage.
- b. ECCW Siphon testing has been upgraded to effectively challenge the siphon, primarily by extending the duration of the test to four hours with provisions to measure the siphon flow rate.
Testing of the siphon on all three units was performed successfully, demonstrating the ability of the siphon to deliver the required flow.
- 4. Corrective steps which will be taken to avoid further violations:
Testing of the ECCW Siphon using the upgraded test methods will be performed during each units refueling outage to assure the operability of the siphon.
- 5. Date of Full Compliance:
October 23, 1986
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