ML030290669
| ML030290669 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 01/17/2003 |
| From: | Minahan S Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L 1710 | |
| Download: ML030290669 (2) | |
Text
P.O. Box 63 Lycoming, New York 13093 Constellation Energy Group Nine Mile Point January 17, 2003 Nuclear Station NWIL 1710 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Subject:
Nine Mile Point Unit 1 Docket No. 50-220 License No. DPR-63 Special Report, Channel # 11 Containment Hydrogen Monitoring System Inoperable for Performance of Scheduled Preventive Maintenance Gentlemen:
In accordance with Action Statement 4.a of Nine Mile Point Unit 1 Technical Specification Table 3.6.11-2, Accident Monitoring Instrumentation Action Statements, Nine Mile Point Nuclear Station, LLC is submitting the following Special Report concerning the inoperability of the Channel #11 Containment Hydrogen Monitoring System.
Description of Event On January 7, 2003, at 0440 hours0.00509 days <br />0.122 hours <br />7.275132e-4 weeks <br />1.6742e-4 months <br />, the Channel #11 Containment Hydrogen Monitoring System was removed from service to allow performance of scheduled preventive maintenance. The Channel #1 1 Containment Hydrogen Monitoring System was de-energized to allow replacing the electrolytic capacitors of power supply PWRS-(1S50)-24VDC. Isolating the power supply from its 120 VAC power source, also required isolating 120 VAC power to Channel #11 Containment Hydrogen Monitoring System.
The redundant Channel #12 Containment Hydrogen Monitoring System was in service prior to removing Channel #11 from service.
Maintenance was completed and the Channel #11 Containment Hydrogen Monitoring System was restored to service on January 10, 2003, at 1452 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.52486e-4 months <br />.
Cause of Event The Channel #11 Containment Hydrogen Monitoring System was removed from service to allow performance of scheduled preventive maintenance.
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Page 2 NMP1L 1710 Corrective Actions Preventive maintenance was performed and the Channel #11 Containment Hydrogen Monitoring System was restored to service on January 10, 2003, at 1452 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.52486e-4 months <br />.
Very truly yours, Stewart B. Minahan Manager Unit 2 Operations SBM/KLE/jm cc:
Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector