ML041950184

Special Report, Channel #11 of the Containment Hydrogen Monitoring System Removed from Service for Planned Maintenance

ML041950184
Person / Time
Site:	Nine Mile Point
Issue date:	07/06/2004
From:	Hopkins L Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMPIL 1850
Download: ML041950184 (2)

Text

Constellation Energy' RO. Box 63 A Nine Mile Point Nuclear Station Lycoming, New York 13093 July 06, 2004 NMP1L 1850 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 of the Containment Hydrogen Monitoring System Removed from Service for Planned Maintenance.

Gentlemen:

In accordance with Action 4.a of Nine Mile Point Unit I 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 inoperability of Channel #11 of the Containment Hydrogen Monitoring (CHM) System.

Descriptionof Event On June 2,1; 2004 at approximately 0538 hours0.00623 days <br />0.149 hours <br />8.895503e-4 weeks <br />2.04709e-4 months <br />, operators removed Channel #11 of the CHM System from service.

The redundant Channel #12 was verified to be in service prior to removal of Channel #11 from-service. - - - - -

Cause of Event Channel #11 of the CHM System was removed from service to support planned maintenance on the Containment Activity Monitor (CAM) System isolation valves.

Channel #11 of the CHM System shares a common return line with the CAM System and therefore becomes inoperable during the CAM isolation valve maintenance.

,*, . . g. i,. -.I.;

• .! . *' 2!

NMP1L 1850 Page 2 Corrective Actions The CAM isolation valve maintenance was completed and Channel #11 of the CHM System was restored to operable on June 26th, 2004, at approximately 1435 hours0.0166 days <br />0.399 hours <br />0.00237 weeks <br />5.460175e-4 months <br />.

Very Truly yours,

_Lav-rence-A.-Hopkins  :

Plant General Manager LAHIJTC/jm cc: Mr. H. J. Miller, NRC Regional Adnministrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector