ML20133G802

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Submits Proposed Schedule for Meeting Requirements of 10CFR50.62 Re Reduction of Risk from ATWS Events for Light Water Cooled Nuclear Power Plants,Per Generic Ltr 85-06, Nonsafety-Related ATWS Equipment
ML20133G802
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 10/11/1985
From: Dixon O
SOUTH CAROLINA ELECTRIC & GAS CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
GL-85-06, GL-85-6, NUDOCS 8510160129
Download: ML20133G802 (2)


Text

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SOUTH CAROLINA ELECTRIC & GAS COMPANY POST Office 7H cotuusiA. south CARouNA 29218

o. w. o.,o . ;.. Oc tob e r 11, 1985 vice pn .een, mactean on ar o s Mr. Harold R. Denton, Director

, Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Virgil C. Summer Nuclear Station Docket No. 50/395

" Operating License No. NPF-12 Generic Letter 85-06 Non-Safety-Related ATWS Equipment

Dear Mr. Denton:

On June 1,1984, the Commission approved publication of the final rule (10CFR50.62) regarding the reduction of risk from anticipated transients without scram ( ATWS) events for light-water cooled nuclear power plants. This rule required licensees to develop and submit to the Director of the Office of Nuclear Reactor Regulation a proposed schedule for meeting the requirements of the rule within 180 days af ter issuance of NRC Staf f quality assurance (QA) guidance for non-safety-related equipment encompassed by the ATWS rule. On April 16, 1985, the NRC Staf f issued Generic Letter 85-06, " Quality Assurance Guidance for ATWS Equipment That Is Not Safety-Related," thus initiating the schedule contained in 10CFR50.62. The purpose of this letter is to provide South Carolina Electric and Gas Company's (SCE6G) proposed schedule for meeting the requirements of the ATWS rule as it applies to the Virgil C. Summer Nuclear Station.

In a letter from L.D. Butterfield to C.O. Thomas dated July 25, 1985, the Westinghouse Owners Group (WOG) submitted Topical Report WCAP-10858, "AMSAC Generic Design Package," which describes three conceptual designs that meet the requirements found in 10CFR50.62. This requirement is to have equipment from sensor output to final actuation device, that is diverse from the reactor trip system, to automatically initiate the auxiliary feedwater system and to initiate a turbine trip under conditions indicative of an ATWS. SCE&G is a member of the WOG and participated in the development of this WCAP. SCE&G's selection of a final design from one of these three conceptual designs will depend on the NRC's approval of WCAP-10858.

The proposed schedule for implementation of the ATWS rule is based in part upon the completion of the NRC Staf f's review of the WOG AMSAC generic. design package. A time period of approximately eighteen (18) months will be necessary following receipt of the NRC Safety Evaluation Report (SER) to' allow for both detailed plant specific design of the system (approximately six months) and procurement of materials (approximately 12 months). This proposed ' schedule assumes that the NRC Staff does not require a plant specific design review prior I

to implementation of the design at the Virgil C. Summer Nuclear Station. SCE&G will submit a description of the final design and final implementation schedule within six months of receipt of the SER. Currently SCE6G expects that the e5 df gOlgO 5 ,

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< t b Mr. Harold R. Denton Page Two Oc tob e r 11, 1985 sys tem could be installed during the first scheduled refueling outage af ter the above described 18 month period. This schedule will put final implementation beyond the date outlined in 10CFR50.62; however, without NRC Staf f approval and issuance of the supporting SER, SCE&G is unable to provide a schedule which supports the rule.

If you should have any questions or request additional information, please contact us at your convenience.

Very truly yours,

, f O . W . DJ xo n , Jr, AHM:0WD : tdh c: V . C . S u mme r T. C. Nichols , Jr./O. W. Dixon, Jr.

E. H. Crews , Jr.

E. C. Roberts W. A. Williams , Jr.

D. A. Nauman J. Nelson Grace Group Managers O. S. Bradham C. A. Price C. L. Ligon (NSRC)

K. E. Nodland R. A. St ough G. O. Percival C. W. Hehl J. B. Knotts, Jr.

NPCF File