ML20207G570

Ro:On 880803,Kaman Process Vent Radiation Monitor RI-GW-178 Exceeded Action Statement 35 of Tech Specs 3.3.3.1.Caused by Technical Problems Encountered During Calibr of RI-GW-178. RI-GW-178 Returned to Svc & Action Statement Cleared

ML20207G570
Person / Time
Site:	North Anna
Issue date:	08/17/1988
From:	Cruden D VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-538, NUDOCS 8808240164
Download: ML20207G570 (2)

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YlWOINI A 13Lr.CTNIC AND l'OWIIM COMi%NY IIICllMOND. VIH(1741J. UllHhl g

August 17, 1988 u.s.c.t...

Vera l'assiusur Nettuan United States Nuclear Regulatory Commission Serial No. 88 538 Attention: Document Control Desk NAPS /DEQ/deq Washington, D. C. 20555 Docket No. 50-338 License No. NPF 4 Gentle'nen,  ;

VIRGINIA ELECTRIC AND POWER COMPANY HQRIH ANNA POWER STATION UNIT 1 KAMAN PROCESS VENT RADIATION MONITOR At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on August 3, 1988, with Units 1 and 2 at 100 percent power (Mode 1), the Kaman Process Vent Radiation Monitor, RI-GW 178, exceeded the Action Statement 35 of Technical Specification 3.3.3.1. Since Action Statement 35 of Technical Specification 3.3.3.1 requires that the radiation monitor be returned to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or initiate the alternate method of monitoring and submit a Special Report, this event is reportable pursuant to Technical Specification 6.9.2.

Radiation monitor RI GW-178 was initially removed from service at 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> on July 25, 1988 for the 18 month performance of 2 PT-44.2.40, "Process Vent Noble Gas High Rany Effluent Monitor (RM GW-178) Calibration." This calibration is performed in segments in order to comply with the Technical Specification Action Statement. Due to technical problems encountered during the performance of 2 PT 44.2.40, RM GW-178 was not able to be returned to service within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time frame required by Action Statement 35 of Technical Specification 3.3.3.1. At 1428 hours0.0165 days <br />0.397 hours <br />0.00236 weeks <br />5.43354e-4 months <br /> on August 8, 1988, the performance of 2-PT 44.2.40 was satisfactorily completed, RI GW-178 was returned to service, and the Action Statement was cleared.

This event posed no significant safety implications because the Westinghouse Process Vent Radiation Monitors, which perform the same automatic functions as RI GW 178, remained operable throughout this event. Additionally, the Nuclear Research Corporation Radiation Monitors continued to operate throughout this event as the Technical Specification required preplanned alternate monitoring method on the process vent release path, ge2%gN S

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To prevent recurrence of similar events, a Technical Specification change will be evaluated to allow the applicable radiatit n monitors of Table 3.3 6 of Technical Specification 3.3.3.1 to be returned to operable status within 7 days instead of the current 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

Very truly yours, hh2 %

S. Cruden ec: U.S. Nuclear Regulatory Commission 101 Marietta Street, N. W.

Suite 2900 Atlanta, Georgia 30323 Mr. J. L. Caldwell NRC Resident inspector North Anna Power Station