ML20126K991

Forwards Safety Evaluation Re Licensee 850524 Submittal on Environ Qualification,Design & Functioning of Position Switches for Drywell Vacuum Breaker Check Valves.Position Switch Design Acceptable

ML20126K991
Person / Time
Site:	Grand Gulf
Issue date:	07/23/1985
From:	Novak T Office of Nuclear Reactor Regulation
To:	Richard J MISSISSIPPI POWER & LIGHT CO.
Shared Package
ML20126K994	List: ML20126K991 ML20126K998
References
TAC-57769, NUDOCS 8507300543
Download: ML20126K991 (2)

Text

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July 23, 1985 Docket No. 50-416 DISTRIBUTION: .

-Docket File. OELD, Attorney NRC PDR ACRS (16)

Mr. Jackson B. Richard Local PDR JPartlow Senior Vice President, Nuclear PRC System BGrimes Mississippi Power and Light Company NSIC EJordan Post Office Box 23054 LB #4 r/f Jackson, Mississippi 39205 MDuncan LKintner

SUBJECT:

GRAND GULF UNIT 1 DRYWELL VACUUM BREAKER POSITION SWITCHES

Dear Mr. Richard:

By letter dated May 24, 1985, the Mississippi Power and Light Company provided a description of the design and functioning of position switches for drywell vacuum breaker check valves. These position switches are required by Grand Gulf Unit 1 License Condition 2.C.(35) to be installed prior to startup following the first refueling outage.

The enclosed safety evaluation describes staff's review of the May 24, 1985, submittal. The licensee plans to install single proximity type position switches on each of six vacuum breaker check valves with separate position indication and a common annunciator in the control room. These position switches are used to assure that check valves are closed during normal operation and they are, therefore, environmentally qualified for normal plant operation. Position switches on motor operated valves in each line are environmentally qualified for loss of coolant accident conditions. The staff concludes that the design of the position switches for drywell vacuum breaker check valves as proposed in licensee's May 24, 1985 letter is acceptable.

Sincerely,

/S/

Thomas M. Novak, Assistant Director for Licensing Division of Licensing

Enclosure:

As stated cc: See next page 8507300543 850723 PDR ADOCK 05000416 P PDR

'& DSV \n DL:LB#4 'M - C:DL:LB#4

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r Mr. Jackson B. Richard Mississippi Power & Light Company Grand Gulf Nuclear Staiton cc:

Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.

Wise, Carter, Child, Steen and Caraway Attorney General P.O. Box 651 Department of Justice Jackson, Mississippi 39205 State of Louisiana Baton Rouge, Louisiana 70804 Nicholas S. Reynolds, Esquire Bishop Libennan, Cook, Purcell Mr. Oliver D. Kingsley, Jr.

and Reynolds Vice President, Nuclear Operations 1200 17th Street, N.W. Mississippi Power & Light Company Washington, D. C. 20036 P.O. Box 23054 Jackson, Mississippi 39205 Mr. Ralph T. Lally Manager of Quality Assurance Office of the Governor Middle South Services, Inc. State of Mississippi P.O. Box 61000 Jacksoa, Mississippi 39201 New Orleans, Louisiana 70161 Attorney General Mr. Larry F. Dale, Director Gartin Building Nuclear Licensing and Safety Jackson, Mississippi 39205 Mississippi Power & Light Company P.O. Box 23054 Mr. Jack McMillan, Director Jackson, Mississippi 39205 Solid Waste Mississippi State Board of Health Mr. R. W. Jackson, Project Engineer 880 Lakeland l

Bechtel Power Corporation Jackson, Mississippi 39206 15740 Shady Grove Road Gaithersburg, Maryland 20760 Alton B. Cobb, M.D.

State Health Officer Mr. Ross C. Butcher State Board of Health

, Senior Resident Inspector P.O. Box 1700 U.S. Nuclear Regulatory Commission Jackson, Mississippi 39205 Route 2, Box 399 Port Gibson, Mississippi 39150 President Claiborne County Board of Supervisors Regional Administrator, Region II Port Gibson, Mississippi 39150 i

U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 Mr. J. E. Cross, General Manager Grand Gulf Nuclear Station Mississippi Power & Light Company P.O. Box 756 Port Gibson, Mississippi 39150 ,}