ML20207Q558
| ML20207Q558 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/01/1986 |
| From: | Lemons J BALTIMORE GAS & ELECTRIC CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8701270537 | |
| Download: ML20207Q558 (2) | |
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e BALTIMORE GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 NUCLEAR OPERATIONS DEPARTMENT CALVERT CLM$ NUCLEAR POWER PLANT LUSSY. MARYLAND 20657 December 1,1986 Dr. Thomas E. Murley Regional Administrator U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PennsyNania 19406
Subject:
Calvert Cliffs Nuclear Power Plant Unit I and Unit 2 Main Vent Wide Range Noble Gas Effluent Monitor
Dear Dr. Murley:
On October 1,1986, the Calvert Cliffs Nuclear Power Plant Unit I and Unit 2 Main Vent Wide Range Noble Gas Effluent Monitors (WRNGM) were declared inoperable as referenced in the letter from 3. R. Lemons to Dr. T. E. Murley dated October 9,1986.
The WRNGM was declared inoperable after plant staff identified a Surveillance Test Procedure (STP) deficiency dealing with the calibration of the High-Range and Mid-Range Detectors for both Units.
As required by Action Statement 3.3.3.lb, the preplanned alternate method of monitoring was entered immediately since the prescribed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> within Technical Specifications had been exceeded. The alternate method is described in the Calvert Cliffs Emergency Response Plan Implementation Procedure (ERPIP) No. 4.4.3/Rev. 9.
Unit i High-Range and Mid-Range Detectors were determined to be out of calibration and were replaced. A transfer calibration was performed using a vendor calibration procedure. Additionally, a signal cable between the High-Range Power supply and the Remote Preamplifier was found to have a damaged shield which caused a noise problem. This cable will be replaced before returning to Mode 4 af ter the Unit 1 eighth refueling outage.
Unit 2 High-Range and Mid-Range Detectors were found to be within the vendors specification even though the procedure was inadequate. A full check was performed on Unit 2 electronics. The Remote Preamplifier and the Mid-Range Detector Power Supply were found to be outside acceptable limits. Each ccmponent was replaced and a transfer calibration reverification was performed. Unit 2's WRNGM was returned to service October 18,1986.
l 8701270537 861201 PDR ADOCK 05000317 S
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'e Dr. Thomas E. Murley December 1,1986 Page 2 Due to the identified STP deficiency, Licensee Event Report (LER) 86-05 was filed. The long range corrective action to address the deficiency will be to modify the STP with proper plant staff review which includes the Systems Engineer who identified the deficiency.
This report will be the last notification to the Nuclear Regulatory. Commission of the operability of Unit I and Unit 2 Main Vent Wide Range Noble Gas Effluent Monitors.
Sincerely,
- f. R. Lemons 3
Manager-Nuclear Operations Department CWM/pah cc:
Mr. 3. A. Tiernan Mr. W. 3. Lippold Mr. C. W. Main Mr. C. R. Mahon Mr. L. E. Satyards File