ML023240419

Special Report, Channel #12 Containment Hydrogen Monitoring System Inoperable Due to Degraded Solenoid Valve

ML023240419
Person / Time
Site:	Nine Mile Point
Issue date:	10/30/2002
From:	Hopkins L Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMPIL 1694
Download: ML023240419 (2)

Text

P.O. Box 63 Lycoming, New York 13093 Constellation Energy Group Nine Mile Point Nuclear Station October 30, 2002 NMP1L 1694 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Nine Mile Point Unit 1 Docket No. 50-220, -DPR-63 - -

Special Report, Channel #12 Containment Hydrogen Monitoring System Inoperable Due to Degraded Solenoid Valve 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.

Description of Event On October 16, 2002, during preparation for the calibration of the Containment Hydrogen Monitoring System, a chattering noise was noted coming from the Channel #12 Containment Hydrogen Monitoring System cabinet. Further investigation revealed that the source of the noise was solenoid operated valve SOV-201.2-1248. At approximately 1434 hours0.0166 days <br />0.398 hours <br />0.00237 weeks <br />5.45637e-4 months <br />, operators shut down the Channel #12 Containment Hydrogen Monitoring System and the chattering ceased

-- Thr-ediii-idanc t Channel #11 ContainmefiteHydrogen Monitoring System was in service prior to removing Channel #12 from service.

Cause of Event Troubleshooting concluded that SOV-201.2-1248 was degraded. An inspection of the solenoid internals determined that the degradation was the result of normal wear.

Page 2 NMP1L 1694 CorrectiveActions

1. The solenoid operated valve was replaced.

2. On October 25, 2002, at 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />, Channel #12 Containment Hydrogen Monitoring System was returned to service.

3. The solenoid valve failure has been entered into the site's corrective action program to assess the need for additional follow-up actions.

Very truly yours, Lawrence A. Hopkins Plant General Manager LAHIKLEfjm cc: Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector J .