ML053480205

Special Report for Nine Mile Point Unit 1 Re Channel #12 of the Containment Hydrogen Monitoring System Inoperable

ML053480205
Person / Time
Site:	Nine Mile Point
Issue date:	12/02/2005
From:	O'Connor T Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP1L 2006
Download: ML053480205 (2)

Text

Coniteliation Constellation Energy 'Lycoming, P.O. Box 63 NY 13093

• Nine Mile Point Nuclear Station December 2, 2005 NMP1L 2006 U. S. Nuclear Regulatory Commission Attn: Documeni Control Desk Washington, DC 20555-0001

SUBJECT:

Nine Mile Point Unit 1 Docket No. 50-220 License No. DPR-63 Special Report, Channel #12 of the Containment Hydrogen Monitoring System Inoperable Gentlemen:

In accordance with Action 4.a of Nine Mile Point Unit 1 Technical Specification Table 3.6.11-2, "Accident Monitoring~nstrumentation Action Statements," Nine Mile Point Nuclear Station, LLC, is submitting the following Special Report concerning inoperability of Channel #12 of the Containment Hydrogen Monitoring (CHM) System.

Descriptionof Event On November 18, 20 0, at 0819 hours0.00948 days <br />0.228 hours <br />0.00135 weeks <br />3.116295e-4 months <br />, operators declared Channel #12 of the CHM System inoperable to performed surveillance testing. On November 18, 2005, at 1358 hours0.0157 days <br />0.377 hours <br />0.00225 weeks <br />5.16719e-4 months <br />, Channel #12 ogthe qfiM System failed the surveillance test and remained inoperable.

The redundant Channel #11 was verified to be operable prior to declaring Channel #12 inoperable.

Cause of Inoperabiitv Channel #12 of the CHM System was removed from service to perform scheduled surveillance testing. The surveillance test failed due to a shorted diode in the hydrogen sensor circuit.

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Page 2 NMP1L 2006 Actions Taken The diode and the associated fuse in the hydrogen sensor circuit were replaced. Post maintenance and surveillance testing were performed satisfactorily and Channel #12 of the CHM System was restored to operable status on November 30, 2005, at 1105 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.204525e-4 months <br />.

Should you have any questions regarding this submittal, please contact JE Director Licensing, at (315) 349-1041. 4i TJO/RF/sac cc: Mr. S. J. Collins, NRC Regional Administrator, Region I Mr. L. M. Cline, NRC Senior Resident Inspector