ML20065N467
| ML20065N467 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/03/1990 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9012120146 | |
| Download: ML20065N467 (2) | |
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BALTIMORE OAS AND ELECTRIC CHARLES CENTER e P.O. BOX -1475
- BALTIMORE, MARYLAND 21203 1475 n E.DENToN OENERAL MAM3ER CALvtRT CLWFS December 3,1990 U. S. Nuclear Regulatory Commission Washington,DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit No.1; Docket No. 50-317
' Wide Rance Noble Gas Effluent Monitor Snecial Renort Gentlemen:
Per the requirements of Technical Specification 3.3.3.1 Table 3.3 6, Item 2.6.1, we hereby submit the following Special-Report concerning an inoperable Wide Range Noble Gas Effluent Radiation Monitor on the Main Vent Stack.
Should you have any further questions regarding this matter, we will be pleased to discuss them with you.
Very truly yours,
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R'ED/CDS/bjd Attachment cc:
D.- A. Brune, Esquire J. E. Silberg, Esquire R. A. Capra, NRC D. G. Mcdonald, Jr., NRC h
T. T. Martin, NRC L E. Nicholson, NRC R. L McLean, DNR
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A'ITACilM ENT (1)
WIDE RANGE NOllLE GAS RADIATION MONITOR (1 RIC 5415)
SPECI AL REPORT
. IIACKGROUND The Un.'t One Wide Range Noble Gas Radiation Monitor (1 RIC-5415) was removed from senice on October '.5,1990 at approximately 0635 to perform a scheduled Channel Calibration, Surveillance Test Procedure (STP). During the performance of the STP, the process flow transmitter for the main vent stack (1-PDT 5414) was found out of tolerance.
His required 1 PDT 5415 to be calibrated. The range of this transmitter is 0-2.2 inches 110. The 2
transmitter is located outside on the main vent stack at the 188-foot elevation, which has an impact on when the transmitter can be calibrated since it must be calibrated in place. When the transmitter is calibrated, the low pressure side is open to atmosphere. Any wind gust will have an effect on the calibration of the transmitter due to the low range of the transraitter. As a result of the required conditions to calibrate the transmitter,3 days of testing time were lost due to weather conditions.
Calibration was completed on October 31,1990. Operations completed the functional test of the Wide Range Noble Gas Monitor and the channel was returned to service on November 1,1990 at approximately 1440.
EFFECT ON OPERATION When 1 RIC-5415 was removed from senice, Unit One Technical Specification 3.3.3.1 ACTION Statement (30) was entered, in accordance with the ACrlON Statement and the radioactive gas release procedure (CP 213), the main vent radiation monitor (1 RI 5415) was used as the alternate preplanned method to monitor the main vent stack for effluents in the discharge flow stream. Thus, the inoperability of 1 RIC-5415 had no affect on the operation of the Unit.
r PLANS AND SCIIEDUI.ES The Wide Range Noble Gas Radiation Monitor (1 RIC 5415) was returned to service on November 1,1990, a total of seven and one-half days after it was removed from sersice.
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