ML022610380

Submittal of Special Report Re Inoperability of Channel #12 Containment Hydrogen Monitoring System at Nine Mile Point Unit 1

ML022610380
Person / Time
Site:	Nine Mile Point
Issue date:	09/03/2002
From:	Hopkins L Constellation Generation Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP1L 1687
Download: ML022610380 (2)

Text

P.O. Box 63 Lycoming, New York 13093 Constellation 0 Gerntion Grcxp Nine Mile Point Nudear Station September 3, 2002 NMP1L 1687 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 RE: Nine Mile Point Unit 1 Docket No. 50-220

-DPR-633--

Subject:

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

Descriptionof Event On August 20, 2002, at approximate 0905 hours0.0105 days <br />0.251 hours <br />0.0015 weeks <br />3.443525e-4 months <br />, operators declared the Channel #12 Containment Hydrogen Monitoring System inoperable for scheduled preventive maintenance.

The scheduled maintenance was to replace the powerstat variable transformer, T1. The maintenance was completed on August 26, 2002, and the Channel #12 Containment Hydrogen Monitoring System was returned to service at approximately 1604 hours0.0186 days <br />0.446 hours <br />0.00265 weeks <br />6.10322e-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 1687 CorrectiveActions The scheduled maintenance was completed and the Channel #12 Containment Hydrogen Monitoring System was returned to an operable status on August 26, 2002 at 1604 hours0.0186 days <br />0.446 hours <br />0.00265 weeks <br />6.10322e-4 months <br />.

Very truly yours, Lawrence A. opkins 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