ML020370299
| ML020370299 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 01/31/2002 |
| From: | Katz P Constellation Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML020370299 (3) | |
Text
Peter E. Katz Plant General Manager 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4101 Constellation Nuclear Calvert Cliffs Nuclear Power Plant A Member of the Constellation Energy Group January 31, 2002 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
SUBJECT:
Document Control Desk Calvert Cliffs Nuclear Power Plant Unit No. 1; Docket No. 50-317 Main Steam Header Noble Gas Effluent Radiation Monitor -- Special Report The attached special report is submitted in accordance with Calvert Cliffs Nuclear Power Plant Technical Requirements Manual, Section 15.3.1, Contingency Measure B.2.2. The report is required due to the inoperability of the Unit 1 Main Steam Header Noble Gas Effluent Radiation Monitor for a period in excess of seven days.
Should you have questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, PEK/CDS/bjd Attachment cc:
R. S. Fleishman, Esquire J. E. Silberg, Esquire Director, Project Directorate I-1, NRC D. M. Skay, NRC H. J. Miller, NRC Resident Inspector, NRC R. I. McLean, DNR
ATTACHMENT (1)
MAIN STEAM HEADER NOBLE GAS EFFLUENT RADIATION MONITOR -- SPECIAL REPORT Calvert Cliffs Nuclear Power Plant, Inc.
January 31, 2002
ATTACHMENT (1)
MAIN STEAM HEADER NOBLE GAS EFFLUENT RADIATION MONITOR --
SPECIAL REPORT Calvert Cliffs Nuclear Power Plant (CCNPP) submits this Special Report concerning the inoperable Unit 1 No. 11 Main Steam Header Noble Gas Effluent Radiation Monitor as required by CCNPP Technical Requirements Manual, Section 15.3.1, Contingency Measure B.2.2.
ACTION TAKEN The 11 Main Steam Header Noble Gas Effluent Radiation Monitor was removed from operable status on January 8, 2002 at approximately 0840 hours0.00972 days <br />0.233 hours <br />0.00139 weeks <br />3.1962e-4 months <br /> to perform a scheduled surveillance test. Surveillance Test Procedure M-565-1, Main Steam Radiation Monitor Calibration Check is performed on an 18-month interval.
A failure of a power supply in the control room rate meter occurred during the performance of the surveillance test. A replacement power supply was not readily available and, therefore, the repair efforts exceeded the seven-day limit, as specified in CCNPP Technical Requirements Manual, Section 15.3.1, for returning a Main Steam Header Noble Gas Effluent Radiation Monitor to operable status.
EFFECT ON OPERATION In accordance with Contingency Measure B. 1 of CCNPP Technical Requirements
- Manual, Section 15.3.1, and our Accidental Radioactivity Release Monitoring and Sampling Methods procedure (ERPIP-821), the preplanned alternate monitoring method was implemented.
The inoperability of the Main Steam Header Noble Gas Effluent Radiation Monitor did not affect Unit 1 operation.
CAUSES OF INOPERABILITY The cause of the inoperability is due to the failure of the power supply for the control room rate meter for the 11 Main Steam Header Noble Gas Effluent Radiation Monitor. Troubleshooting to date has not identified any other failed components. The vendor has been contacted and has stated that the failure of the power supply is an unusual occurrence. The failed power supply card has been returned to the vendor so the cause of the failure can be determined.
PLANS AND SCHEDULES FOR RESTORING THE SYSTEM TO OPERABLE STATUS The replacement power supply card was received on January 14, 2002. Bench testing was performed on the replacement power supply card to ensure that it operates within specifications. The card was installed in the rate meter and Surveillance Test Procedure M-565-1 was completed. The 11 Main Steam Header Noble Gas Effluent Radiation Monitor was returned to service on January 17, 2002 at approximately 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />.
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