ML20090H695
| ML20090H695 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/23/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.3, TASK-TM 044C, 44C, NUDOCS 8407270043 | |
| Download: ML20090H695 (2) | |
Text
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VINGINIA-ELECTRIC AND PowEn COMPANY Ricnwown,VinorwrA 20261 W,L.SrawAar wE.1.$7.7Eo..
July 23, 1984 Mr. Harold R. Denton, Director Serial No. 044C Office of Nuclear Reactor Regulation N0/PEC/DWL:jdm:2002N Attn: Mr. Darrell G. Eisenhart, Director Docket Nos. 50-338 Division of Licensing 50-339 U. S. Nuclear Regulatory Commission License Nos. NPF-4 Washington, D.C.
20555 NPF-7 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY N_0RTH ANNA POWER _ STATION _ UNITS 1 AND 2 NUREr-0737 ITEM II.D.3 i
The purpose of this letter is to advise you of the status of the qualification program for the B&W acoustical monitoring system for direct indication of pressurizer relief and safety valve position (NUREG-0737, Item II.D.3). After experiencing various delays, the B&W test program was completed, and the test report was received by Vepco in late March 1984. Vepco immediately began engineering of the system modifications required by the qualification program. However, several technical concerns arose from this engineering. Due to the delays in receiving the_ test report, the problems encountered in engineering the system modifications and the additional requirements imposed on this system by Regulatory Guide 1.97, Vepco concluded that additional system review was required. This review would ensure the final valve position indication system is' completely qualified and the installed system meets applicable Regulatory Guide 1.97 requirements. _ As a result, the system upgrade will be included under the ireplementation schedule for Regulatory Guide 1.97 variables, which is the first refueling outage after July 1985.
Background
Vepco installed the non-safety grade B&W acoustical monitoring-system as a short-term Post-TMI modification. Vepco's initial response to NUREG-0737, dated December 15,.1980, contained the B&W test program plan for qualifying the system and. indicated that test results would be available in the summer of 1981.
Subsequent revisions to Vepco's NUREG-0737 response have revised this date because of delays in the B&W test program. Our letters dated January 28, 1983=
-(Serial No. 044),' July 29,1983 (Serial No. 044A) and November 30,1983 (Serial No. 044B), again revised the completion date. Our letter dated February 21, 1984 (Serial No. 088), which clarified the Vepco Regulatory Guide.1.97 implementation schedule, stcted that full implementation ~of the acoustical monitoring system improvements would be completed on the schedule for the Regulatory Guide 1.97 variables.
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4 JAs' stated above,cVepco received the B&W test report in late March.1984.
f Based on the test:results, the Vepco systems as installed are not t-renvironmentally qualified..Certain modifications, such as moving the line
- drivers outside containment and substituting coaxial for twisted pair cable P
Linside-containment were. recommended by B&W..Upon identification of the proposed-
-modifications,- Vepco.-immediately initiated work on a design change.for upgrading
'the' existing system. After_several weeks of work, however, problems were-11dentified-with the proposed modifications relating to ;(1) potential. system signal interferences with the:as-built' plant and '(2) difficulties in' obtaining
. qualified: cable splices for this particular application. -In order to install-a
-system-that is qualified;and also meets the requirements of Regulatory Guide 1.97, Vepco has concluded additional time is required to perform a complete c
system review prior to implementing any modifications.
Commitment L
Due' to th'e difficulties of qualifying.the existing system as' discussed alvve, Vepco preposes to perform.a complete review of thezsystem design and applicable requirements for_ system upgrade. This review will consider both the necessary moJifications to qualify the present system as well as other. system options that~ meet regulations.
Vepco plans to complete this system review by th'e end of 1984. The' final design will be (1) environmentally qualified, (2) meet the requirements'of Regulatory Guide 1.97, and.(3) installed by the end of the first refueling outage after July 1985. This outage is presently scheduled-in ~1986 for each of the two units.
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Very, truly yours, W. L. Stewart cc: Mr.' James P. O'Reilly
. Regional Administrator
. Region II Mr. - James. R.'. Miller, Ch'ief.
e-Operating Reactors-Branch No'. 3:
Division of Licensing Mr. M.'W.-Branch N
- NRC Resident Inspector _.
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. North. Anna Power < Station.
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