ML023330400

Special Report, Channel #11 Containment High Range Radiation Monitor Declared Inoperable to Repair Failed Chart Recorder

ML023330400
Person / Time
Site:	Nine Mile Point
Issue date:	10/31/2002
From:	Hopkins L Constellation Energy Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP1L 1695
Download: ML023330400 (2)

Text

P.O. Box 63 Lycoming, New York 13093 Constellation Energy Group Nine Mile Point Nuclear Station October 31, 2002 NMP1L 1695 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 Containment High Range Radiation Monitor Declared Inoperable to Repair Failed Chart Recorder Gentlemen:

In accordance with Action Statement 3.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 Channel #11 Containment High Range Radiation Monitor.

Description of Event On October 17, 2002, at approximately 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br />, operators declared the Channel #11 Containment High Range Radiation Monitor inoperable in order to troubleshoot and repair the Channel #11 Containment High Range Radiation Monitor chart recorder.

The redundant Channel #12 Containment High Range Radiation Monitor was operable while the Channel #11 Containment High Range Radiation Monitor was out of service.

Cause of Event The cause of the Channel #11 Containment High Range Radiation Monitor chart recorder failure was a failed servo motor amplifier board.

Page 2 NMP1L 1695 Corrective Actions

1. The Channel #11 Containment High Range Radiation Monitor chart recorder servo motor amplifier board was replaced and the chart recorder calibrated.

2. On October 17, 2002, at approximately 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br />, the Channel #11 Containment High Range Radiation Monitor was returned to service.

3. The Containment High Range Radiation Monitor chart recorder failure has been entered into the site's corrective action program to assess the need for additional follow up actions.

Very truly yours, L-A AL-Lawrence A. Hopkins Plant General Manager LAH/KLE/jm xc: Mr. H. J. Miller, Regional Administrator, Region I Mr. G. K. Hunegs, NRC Senior Resident Inspector