ML042530073

Special Report for Nine Mile Point Unit 1 Re Channel #11 of the Containment Hydrogen Monitoring System Inoperable for Scheduled Preventive Maintenance

ML042530073
Person / Time
Site:	Nine Mile Point
Issue date:	08/27/2004
From:	O'Connor T Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP1L 1864
Download: ML042530073 (2)

Text

.. Constellation Energy- RO. Box 63 Nine Mile Point Nuclear Station Lycoming, New York 13093 August 27, 2004 NMP1L 1864 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 Inoperable for Scheduled Preventive Maintenance Gentlemen:

In accordance with Action 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 inoperability of Channel #11 of the Containment Hydrogen Monitoring (CHM) System.

Description of Event On August 16, 2004, at approximately 0818 hours0.00947 days <br />0.227 hours <br />0.00135 weeks <br />3.11249e-4 months <br />, operators declared Channel #11 of the CHM System inoperable to support preventive maintenance on thle Containment Activity Monitoring (CAM) System. '

The redundant'Chhninel #12 was verified to be operable prior to removing Channel #11 from service.

Cause of Event Channel #11 of the CHM System was' declared inoperable in order to perform scheduled preventive maintenance on the Drywell CAM isolation valve actuators. 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. The CAM maintenance replaced the actuator rubber goods.'

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Page 2 NMP1L 1864 CorrectiveA ctions The scheduled preventive maintenance was completed and Channel #11 of the CHM System was returned to an operable status on August 25, 2004, at approximately 506 hours0.00586 days <br />0.141 hours <br />8.366402e-4 weeks <br />1.92533e-4 months <br />.

--- othy J.-O'Connor --- - -

ant General Manager TJOIRF/jm cc: Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector