ML20153C257
| ML20153C257 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/18/1998 |
| From: | Katz P BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9809240033 | |
| Download: ML20153C257 (2) | |
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PETE3 E. KATz Baltimore Gas and Electric Company Plant Ger : al Manager Calvert Cliffs Nuclear Power Plant Calvert s ifs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4101 September 18,1998 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit No. 2: Docket No. 50-318 Soecial Reoort - Wide Range Noble Gas Monitor The attached special report is submitted in accordance with Calvert Cliffs Updated Final Safety Analysis Report (UFSAR) Section 15.3.1, Contingency Measure B.2.2. The report is required due to the Unit 2 Wide Range Noble Gas Monitor having less than the required minimum number of operable channels.
Should you have questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, L
.EmP PEK/JKK/bjd
/
I Attachment cc:
R. S. Fleishman, Esquire H. J. Miller, NRC J. E. Silberg, Esquire Resident Inspector, NRC S. S. Bajwa, NRC R. I. McLean, DNR A. W. Dromerick, NRC J. H. Walter, PSC
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ATTACHMENT (1)
UNIT 2 WIDE RANGE NOBLE GAS MONITOR SPECIAL REPORT Baltimore Gas and Electric Company submits this special report concerning the inoperable Unit 2 Wide Range Noble Gas Monitor (WRNGM) channel as required by Calvert Cliffs Updated Final Safety Analysis Report (UFSAR), Section 15.3.1, Contingency Measure B.2.2.
1 ACTION TAKEN The Unit 2 WRNGM was removed from operable status on August 30,1998, at approximately 0805 for performance of the 18-month channel calibration as required by Calvert Cliffs UFSAR, Section 15.3.1, Technical Verification Requirement 15.3.1.3. During the performance of the channel calibration, five l
subcomponents (an output relay to the plant computer, the power supplies to the mid and high range detection channels, and the low and mid/high range sample line mass flowmeters) were found outside their expected calibration tolerances. The performance of troubleshooting, component replacement, and preparation of required engineering documentation impacted the planned duration for performance of the 18-month channel calibration. Thus, the restoration time of seven days, as specified in Calvert Cliffs l
UFSAR, Section 15.3.1, for returning the WRNGM to operable status was not met.
EFFECT ON OPERATION in accordance with Calvert Cliffs UFSAR, Section 15.3.1, Contingency Measure B.1, and our Accidental Radioactivity Release Monitoring and Sampling Methods procedure (Emergency Response Plan Implementation Procedure-821), the preplanned alternate monitoring method was implemented. During the period that the Unit 2 WRNGM was not operable, the Unit 2 main vent radiation monitor remained operable. The inoperability of the WRNGM did not affect Unit 2 operation.
CAUSES OF INOPERABILITY l
The initial cause of the inoperability was to support the performance of the required 18-month channel calibration. The inoperability period was extended beyond the seven day restoration time requirement due to the need to replace several out-of-:alibration subcomponents.
PLANS AND SCHEDULES FOR RESTORING THE SYSTEM TO OPERABLE STATUS If is expected that the Unit 2 WRNGM will be returned to operable status by September 25, 1998, following the completion of the 18-month channel calibration. The WRNGM will have been inoperable for approximately 37 days.
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