ML023240419
| 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 Corrective Actions
- 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
.