ML020560161
| ML020560161 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/20/2002 |
| From: | Katz P Constellation Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML020560161 (2) | |
Text
Peter E. Katz Plant General Manager 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4101 Constellation I
Nuclear Calvert Cliffs Nuclear Power Plant A Member of the Constellation Energy Group February 20, 2002 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
SUBJECT:
Document Control Desk Calvert Cliffs Nuclear Power Plant Unit No. 2; Docket No. 50-318 Special Report - Wide Range Noble Gas Effluent Radiation Monitor The attached special report is submitted in accordance with Calvert Cliffs Updated Final Safety Analysis Report Section 15.3.1, Contingency Measure B.2.2. The report is required due to the inoperability of the Unit 2 Wide Range 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, for Peter E. Katz Plant General Manager PEK/TWG/dlm 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
-:1 tdc -,
ATTACHMENT (1)
UNIT 2 WIDE RANGE NOBLE GAS EFFLUENT RADIATION MONITOR SPECIAL REPORT Calvert Cliffs Nuclear Power Plant (CCNPP) submits this Special Report concerning the inoperable Unit2 Wide Range Noble Gas Monitor as required by CCNPP Technical Requirements Manual, Section 15.3.1, Contingency Measure B.2.2.
ACTION TAKEN The Unit 2 Wide Range Noble Gas Monitor was removed from operable status on January 21, 2002 at approximately 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br /> to perform a scheduled surveillance test. The surveillance test procedure, M-564-2, is performed on an 18-month interval.
Near the end of the surveillance test procedure on January 25, 2002, a vacuum leak test was performed on the radiation monitoring system detector skid and a leak was detected. Later that day, a small leak on the sample pump was identified and a maintenance order for replacing the sample pump was approved.
However, the maintenance order was assigned the wrong work priority. This resulted in a delay of the pump replacement until January 28, 2002. On January 28, 2002, the repair efforts were delayed by a misunderstanding of the compensatory measures, associated with the Limiting Condition for Operation extension on the Unit 2 No. 2A Emergency Diesel Generator, which allowed no discretionary maintenance on any Unit 2 safety-related equipment. The sample pump was replaced and the Unit 2 Wide Range Noble Gas Monitor was returned to service on January 28, 2002 at approximately 1320 hours0.0153 days <br />0.367 hours <br />0.00218 weeks <br />5.0226e-4 months <br />. Locating the leak, the repair efforts, and the skid restoration exceeded the seven-day limit, as specified in CCNPP Technical Requirements Manual, Section 15.3.1, for returning a Wide Range Noble Gas 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. During the period that the Unit 2 Wide Range Noble Gas Effluent Radiation Monitor was not in operable status, the Unit 2 Main Vent Radiation Monitor remained in operable status. The inoperability of the Unit 2 Wide Range Noble Gas Monitor did not affect Unit 2 operation.
CAUSES OF INOPERABILITY The cause of the inoperability was the inability to meet the acceptance criteria for a vacuum test on the detector skid. The small size of the leak and its location on the sample pump made it difficult to localize.
The maintenance order work priority and the misunderstanding of the compensatory measures, associated with the Limiting Condition for Operation extension on the Unit 2 No. 2A Emergency Diesel Generator, also contributed to the length of time that the Unit 2 Wide Range Noble Gas Monitor was in an inoperable status.
PLANS AND SCHEDULES FOR RESTORING THE SYSTEM TO OPERABLE STATUS A replacement sample pump was installed on January 28, 2002. The Unit 2 Wide Range Noble Gas Monitor was returned to service on January 28, 2002, at approximately 1320 hours0.0153 days <br />0.367 hours <br />0.00218 weeks <br />5.0226e-4 months <br />.
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