ML041320499
| ML041320499 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/04/2004 |
| From: | Hopkins L Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NMP1L 1833 | |
| Download: ML041320499 (2) | |
Text
Constellation Energy0 Nine Mile Point Nuclear Station P.O. Box 63 Lycoming, New York 13093 May 4, 2004 NMP1L 1833 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 #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 Instrumentation 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.
Description of Event On April 21, 2004, at approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> Channel #12 of the CHM System became inoperable due to intermittent indications of elevated hydrogen concentrations in the torus.
The redundant Channel #11 of the CHM System was verified to be in service prior to removing Channel #12 from service.
Cause of Event The CHM System was declared inoperable due to indications of irregular changes in hydrogen concentrations. The cause of the inoperability has not yet been determined.
This report will be revised once the cause is identified.
- I 2,
Page 2 NMP1L 1833 Corrective Actions The inoperability of the CHM System Channel #12 is being resolved through the Corrective Action Program. Corrective Actions necessary to restore Channel #12 of the CHM System to operability will be completed by May 18, 2004.
Very truly yours, Lawrence A. Hopkins Plant General Manager LAH/RF/bjh cc:
Mr. H. J. Miller, NRC Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector