ML20116H431
| ML20116H431 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/06/1996 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737 96-382, NUDOCS 9608120087 | |
| Download: ML20116H431 (2) | |
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VIRGINIA ELecruic AND POWER COMI%NY HICitMOND, VIRGINIA 202 61 August 6, 1996 U.S. Nuclear Regulatory Commission Serial No.96-382 Attenticn: Document Control Desk NAPS /JHL/ETS R2 Washington, D.C. 20555-0001 Docket Nos.
50-338 50-339 License Nos.
NPF-4 NPF-7 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS 1 AND 2 REVISED TESTING FREQUENCY OF THE POST ACCIDENT SAMPLING SYSTEM in our letter dated February 3,1984 (Serial No. 757), we responded to a NRC request for information concerning the frequency of calibration and testing of the post accident sampling system (PASS).
In our response, we indicated that the post accident sampling system would be tested on a monthly frequency. Since this is a shared system, testing of the Reactor Coolant System (RCS) sample and the containment air sample functions are performed twice monthly (i.e., once per month per unit). Each testing cycle demonstrates the required capabilities of the system for both liquid and gaseous samples.
This testing commitment met the NRC guidelines for minimum testing of once every six months as identified for Criterion (10) to NUREG 0737, item II.B.3, in NRC [[letter::05000339/LER-1983-077-03, /03L-0:on 831120,fire Damper in Safeguards Ventilation Sys Found Failed in Closed Position.Caused by Failed Fire Damper Fusible Link.Link Replaced & Fire Damper Restored to Operable Status|letter dated December 16,1983]]. The NRC closed this item based on our response letter dated February 24,1984.
We recently conducted a review of PASS availability data, it was determined that the post accident sampling system has maintained an annual availability of at least 96%
since 1994. Based on our positive past performance, we believe that reducing the present PASS test commitment can be accomplished without degrading system capability or significantly affecting system availability. Therefore, we intend to test the RCS sample and containment air sample functions monthly. This will be achieved by drawing a sample from each unit's containment on an every other month basis. This test schedule will adequately exercise the capabilities of the system for both liquid and 9608120087 960806 3
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gaseous samples and continues to meet the minimum guidelines identified in the NRC [[letter::05000339/LER-1983-077-03, /03L-0:on 831120,fire Damper in Safeguards Ventilation Sys Found Failed in Closed Position.Caused by Failed Fire Damper Fusible Link.Link Replaced & Fire Damper Restored to Operable Status|letter dated December 16,1983]].
If you have any questions, please contact us.
Very truly yours, 1
James P. O'Hanlon Senior Vice President - Nuclear cc:
Regional Administrator U.S. Nuclear Regulatory Commission Region 11' 101 Marietta Street, N.W.
Suite 2900 Atlanta, Georgia 30323 Mr. R. D. McWhorter NRC Senior Resident inspector North Anna Power Station l
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