ML20080S008
| ML20080S008 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/21/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, John Miller Office of Nuclear Reactor Regulation |
| References | |
| 092, 92, NUDOCS 8402280483 | |
| Download: ML20080S008 (6) | |
Text
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VIRGINIA ELECTRIC AND PowEn COMPANY Ricnwoxn,VINGINIA 20261
. w, L. STEWART Vaca Paum DENT woca.= = on """"
February 21, 1984 Mr. Harold R. Denton, Director Serial No. 092 Office of Nuclear Reactor Regulation N0/JHL: jab Attn:
Mr. James R. Miller, Chief Docket Nos. 50-338
-Operating Reactors Branch No. 3 50-339 Division of Licensing License Nos. NPF-4 U. S. Nuclear Regulatory Commissien NPF-7 Washington, D. C.
20555 Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NOS. 1 AND 2 SUPPORTING INFORMATION FOR REVISING THE TECHNICAL SPECIFICATIONS FOR OPERABILITY OF THE TURBINE OVERSPEED PROTECTION SYSTEM Your letter dated February 6, 1984, requested additional information regarding our December 12, 1983 amendment request for revising the testing frequency of the turbine overspeed protection system.
Our request was to test the turbine overspeed protection system, at North Anna Unit Nos. I and 2, on a monthly basis instead of once per seven days.
Your request was to provide confirmation that the secondary steam system for North Anna Unit Nos. I and 2 uses all volatile chemical treatment and that the turbine and turbine overspeed protection system fall within the envelope of the Westinghouse generic recommendations for monthly turbine valve testing.
The all volatile chemical treatment for North Anna Unit Nos. 1 and 2 is described in Section 10.4.3.2 of the North Anna Power Station Updated Final Safety Analysis Report. As described, North Anna Unit No. 1, uses a modified all volatile chemical treatment with boric acid treatment and North Anna Unit No. 2 uses the' normal all volatile chemical treatment.
It should be noted that North Anna Unit No. 2 also uses the modified all volatile chemical treatnent.
The North Anna UFSAR will be updated to reflect this change.
In addition. North Anna Unit Nos.
I and 2 follow the recommendations of WCAP-8113, Revision i dated January, 1975 (SIP 5-4 Standard Information Package).
With respect to whether the North Anna turbine and turbine overspeed ' protection system fall within the envelope of the Westinghouse generic recommendations for monthly turbine valve testing, enclosed is a letter from Westinghouse recommending a reduced surveillance interval of once per month.
Very truly yours,
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.a, Vinosusa Esmerasc Awo Powsm Compawr to Harold R. Denton
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Enclosure cc:
Mr.' James P. O'Reilly-Regional Administrator Region II
.Mr. M.'W. Branch NRC Resident. Inspector North Anna Power Station Mr. Charles Price Department-of Health
-109 Governor. Street Richmond, Virginia 23219 f
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~,.D 45S Southlake Boulevard WBStingt10USB soutnoon Businesscenter Electric Corporation Rienmond Virginia 23236 December 2, 1983 Virginia Electric & Power Company P. O. Box 26666 Richmond, Virginia 23261 Attention: Mr. W. L. Stewart Vice-President Nuclear Operations
Subject:
OMM 041, Recommended Testing For Steam Admission Valves On BB 296 Nuclear Turbines With Steam Chests North Anna - Units 1 and 2 S/N 13A3591 and 13A3931 Westinghouse Operation & Maintenance Memo 041 affecting the above units is attached.
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The purpose of this Memo is to recommend a change in the testing frequency for steam admission valves on BB 296 nuclear turbines with steam chests.
- Two extra copies of this OMM are attached. These should be filed in your TMS manuals under green tab E.
- A copy of this letter is attached. Please acknowledge receipt of this in-formation in the space provided and return the copy to us for our files.
Very truly yours, h
I Charle J. Patrick Manager-PGSD Richmond District CJP/pb m
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Page 2.
December 2, 1983 OMM 041,
.CC: VEPCO, Riclunond:
Mr. W. R. Cartwright, Manager Nuclear Operations Support Mr. J. P. Haciejewski, Director of Administrative Services
'CC: VEPCO, North Anna:
C0 Mr. E. W. Harrell, Station Manager Mr. G. E. Kane, Asst. Station Manager 0
Mr. J. R. Harper, Supt. of Maintenance CC: Mr. H. O. Turner, Supt. System Traveling Maintenance Virginia Electric & Power Co.
Henrico SMS Facility 5401 Charles. City Road Richmond, Virginia 23231 i
RECEIPT @ ED:
Name Title Date i
l BCC: RICHMOND, EUS,'T. H. SINEACK PRODUCT MANAGER, STGD COMMERCIAL OPERATIONS, ORLANDO, 375 MANAGER, PGSD, TMS PROGRAM, BR00 MALL i
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OPERATION & MAINTENANCE MEMO 041 1 REASON FOR MEMO Based on a review of testing frequency and performa' nce data from Westinghouse turbine and component incidents records and a 1982 survey of utilities operating Westinghouse nuclear turbines, Westinghouse concluded that for nuclear units with steam chests there is no significant difference in the valve failure rate between valves' tested weekly and those tested monthly. It was further noted that monthly versus weekly valve
-- testing frequency may be beneficial because it reduces the time a plant is operating in a " transient state."
2 OPERATION AND MAINTENANCElhlFORMATION Westinghouse recommends that the throttle, governor, interceptor and reheat stop valves of nuclear turbine-generator units with steam chests be tested monthly.
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