ML20059D634
| ML20059D634 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/15/1993 |
| From: | Cruse C BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9401100024 | |
| Download: ML20059D634 (2) | |
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BALTIMORE GAS AND
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ELECTRIC CALVERT CLIFFS NUCLEAR POWER PLANT 1650 CALVERT CLIFFS PARKWAY
- LUSBY, MARYLAND 20657-4702 CHARLES H. CRUSE PLANT GENEHAL fAANAGER CALVERT CLIFFS December 15,1993 U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Wide Rance Noble Gas Monitor - Special Report In accordance with the requirements of Technical Specification 3.3.3.1, Table 3.3-6, Item 2.b.i, we hereby submit the folk wing Special Report concerning the Unit 1 Wide Range Noble Gas Monitor out of service for more than seven days.
Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours, y
CIIC/DWM/dwm/bjd Attachment cc:
D. A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald, Jr., NRC T. T. Martin, NRC P. R. Wilson, NRC R. I. McIxan, DNR J. H. Walter, PSC 060060 f.[
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9401100024 931235 PDR ADOCK 05000317 k l
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UNIT WII)E RANGE NOIILE GAS EFFLUENT MONITOR SPECIAL REPORT t'
We submit this Special Report concerning an inoperable Wide Range Noble Gas Monitor (WRNGM) on the Unit 1 Main Vent Stack as required by Technical Specification 3.3.3.1, Table 3.3-6, Item 2.b.i.
ACTION TAKEN On November 17,1993, the Unit 1 Wide Range Noble Gas Monitor was removed from service at approximately 1425 when the automatic cight-hour check source on the mid-range channel failed.
During the performance of troubbhooting, the check source assembly was found to be malfunctioning. Repair efforts are continuing.
EFFECT ON OPERATION Unit 1 Technical Specification 3.3.3.1 ACTION Statement (30) was entered when the WRNGM was removed from service. In accordance with ACTION 30 and our radioactive gas release procedure (CP-213), the main vent radiation monitor was being used as the alternate preplanned main vent stack monitor for discharge flow-stream effluents. The WRNGM inoperability did not affect Unit 1 operation.
CAUSE OF INOPERAllllIIY
'Ihe cause of the inoperability was a malfunctioning mid-range check source assembly. An investigation is underway to determire the cause of the malfunction.
PLANS AND SCllEDULES FOR RESTORING TIIE SYSTEM TO OPERAllLE The WRNGM was returned to service on December 14,1993 at 1355.
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