ML020650294

Special Report Re Channel #12 Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance

ML020650294
Person / Time
Site:	Nine Mile Point
Issue date:	02/20/2002
From:	Hopkins L Constellation Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP1L 1643
Download: ML020650294 (2)

Text

P.O. Box 63 Lycoming, New York 13093 Constellation Nuclear Nine Mile Point February 20, 2002 Nuclear Station NMPlL 1643 A Member of the Constellation Energy Group U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: Nine Mile Point Unit 1 Docket No. 50-220 DPR-63

Subject:

Special Report, Channel #12 ContainmentHydrogen Monitoring System Inoperablefor 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 Channel #12 Containment Hydrogen Monitoring System.

Descriptionof Event On February 6, 2002, at approximately 1013 hours0.0117 days <br />0.281 hours <br />0.00167 weeks <br />3.854465e-4 months <br />, operators declared Channel #12 Containment Hydrogen Monitoring System inoperable in order to perform scheduled preventive maintenance. The preventive maintenance was to replace the power supply to the percent hydrogen digital meter. Replacement of the power supply had been planned so that the regularly scheduled Technical Specification Surveillance could be used as the post-maintenance test. The maintenance was completed on February 7, 2002, and the system returned to service at approximately 1255 hours0.0145 days <br />0.349 hours <br />0.00208 weeks <br />4.775275e-4 months <br />.

The redundant Channel #11 Containment Hydrogen Monitoring System was verified in service prior to removing Channel #12 from service.

Cause of Event The Channel #12 Containment Hydrogen Monitoring System was declared inoperable in order to perform scheduled preventive maintenance.

Page 2 NMP1L 1643 CorrectiveActions The maintenance was completed and Channel #12 Containment Hydrogen Monitoring System was returned to an operable status.

Very truly yours, Lawrence A.'Hopkins Unit 1 Plant General Manager LAH/KLE/jm cc: Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector Records Management