ML20137Q890

Forwards Safety Evaluation Re 850812 Request for Amend to License NPF-29,adding Pressure Permissive Interlocks to Control Circuits for Low Pressure ECCS Injection Valves,Item 13 of 850812 Request Should Be Revised

ML20137Q890
Person / Time
Site:	Grand Gulf
Issue date:	11/22/1985
From:	Novak T Office of Nuclear Reactor Regulation
To:	Richard J MISSISSIPPI POWER & LIGHT CO.
Shared Package
ML20137Q894	List: ML20137Q890 ML20137Q897
References
TAC-59440, NUDOCS 8512050378
Download: ML20137Q890 (5)

Text

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j WASHING TON, D. C. 20555 November'22, 1985 Docket No.

50-416 Mr. Jackson B. Richard b

Senior Vice President Mississippi Power and Light Company

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P.O. Box 23054 Jackson, Mississippi 39205

Subject:

Grand Gulf Unit 1 - Low Pres'sure Emergency Core Cooling System (ECCS) Pressure Permissive Interlocks By letter dated August 12, 1985, Mississippi Power and Light Company requested an amendment to the Grand Gulf Nuclear Station, Unit 1 operating license in order to implement a design change which would add pressure permissive interlocks to the control circuits for low pressure ECCS injection valves.

to be implemented prior to startup following the first refueling.This Specification changes proposed to implement this design change were proposed Technical in Item 13 of the Attachment to the August 12, 1985, letter.

During its review of the proposed Technical Specification changes, the NRC staff requested additional information regarding the pressure interlocks.

The licensee provided some of the requested information, including a revised ECCS performance analysis (by letter dated October 22,1985), a description and instrument diagram (by letter dated October 5,1985),

surveillance requirement on ECCS valve opening time (by letter dated September 25, 1985).

information regarding:However, the licensee declined to provide additional circuits in the remote shutdown panel or alternate means to minim potential for inadvertent overpressurization of the low design pressure systems, and (2) changing the in the ECCS piping design pressure.terlock pressure setpoints to values below The purpose of this letter is to request additional information and to provide the NRC staff's safety evaluation and position regarding interlocks for ECCS valve controls on remote shutdown panels and the pressure setpoint for inter-locks on low design pressure ECCS piping. The staff's safety evaluation and down panel, is enclosed. positions, including acceptable alternatives to interlocks on The staff concluded Specification change in Item 13 of the licensee's Augustthat the proposed Technical supplemented by letters dated September 25, October 5, and October 12, 1985, letter, as unacceptable because it does not meet the NRC staff position regarding pressure 22,1985, is DECIGNATED ORIGIN /J, 3

7 B512050378 851122 Certified By PDR ADOCK 05000416

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November 22, 1985 Mr. Jackson B. Richard permissive interlocks for the remote shutdown panel control circuits (Standard Review Plan Section 7.4.III), and because the proposed setpoints for pressure interlocks do not meet the staff position requiring interlock setpoints to be below the ECCS piping design pressure (Grand Gulf Nuclear Station Safety Evaluation Supplement 2, Section 6.3.4, NUREG-0831).

You are requested to revise Item 13 of the August 12, 1985, submittal to respond to the enclosed staff positions. Based on its preliminary review, the NRC staff issued a notice in the Federal Register of its intent to amend the operating license in the manner proposed in the August 12, 1985, submittal. The staff will reissue the notice in this matter due to the need for substantive changes resulting from its safety evaluation.

In order to include the response to this letter in the new notice, you should submit your response within 30 days of receipt of this letter. Your response should include an analysis of significant hazards conditions for any revised proposal pursuant to Section 50.91 (al of 10 CFR 50.

In the absence of an acceptable response to this letter, the staff intends to deny the request for license amendment in Item 13 of the August 12, 1985, letter.

Sincerely, Thomas Novak, Assistant Director for licensing Division of licensing

Enclosure:

As stated cc: See next page l

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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, Escuire Bishop, Liberman, 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 Jackson, 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 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. Bnx 1700 U.S. Nuclear Regulatory Commission Jackson, Mississippi 39206 Route 2, Box 399 Port Gibson, Mississippi 39150 President Claiborne County Board of Supervisors Regional Administrator, Region II Port Gibson, Mississippi 39150 U.S. Nuclear Regulatory Comission, 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 l

,o November 22, 1985 Ncket No.: 50-416 Mr. Jackson B. Richard Senior Vice President Mississippi Power and Light Company P.O. Box 23054 Jackson, Mississippi 39205 j

Subject:

Grand Gulf Unit 1 - Low Pressure Emergency Core Cooling System (ECCS) Pressure Pennissive Interlocks By letter dated August 12, 1985, Mississippi Power and Light Company requested an amendment to the Grand Gulf Nuclear Station, Unit 1 operating license in order to implement a design change which would add pressure permissive interlocks to the control circuits for low pressure ECCS injection valves. This change is required by License Condition 2.C.(18) to be implemented prior to startup following the first refueling. Technical Specification changes proposed to implement this design change were proposed in Item 13 of the Attachment to the August 12, 1985, letter.

During its review of the proposed Technical Specification changes, the NRC staff requested additional infor: nation regarding the pressure interlocks.

The licensee provided some of the requested information, including a revised ECCS performance analysis (by letter dated October 22,1985), a description of the logic incorporated in the pressure permissive interlocks and a piping and instrument diagram (by letter dated October 5,1985), and a proposed surveillance requirement on ECCS valve opening time (by letter dated September 25, 1985). However, the licensee declined to provide additional information regarding:

(1) the addition of interlocks to the valve control circuits in the remote shutdown panel or alternate means to minimize the potential for inadvertent overpressurization of the low design pressure systems, and (2) changing the interlock pressure setpoints to values below the ECCS piping design pressure.

l The purpose of this letter is to request additional information and to provide l

the NRC staff's safety evaluation and position regarding interlocks for ECCS valve controls on remote shutdown panels and the pressure setpoint for inter-I locks on low design pressure ECCS piping. The staff's safety evaluation and l

_ positions, including acceptable alternatives to interlocks on the remote shut-down panel, is enclosed. The staff concludes that the proposed Technical Specification change in Item 13 of the licensee's August 12, 1985, letter, as supplemented by letters dated September 25, October 5, and October 22, 1985, is unacceptable because it does not meet the NRC staff position regarding pressure l

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November 22, 1985

~ Mr. Jackson B. Richard >

permissive interlocks for the remote shutdown panel control circuits (Standard Review Plan Section 7.4.III), and because the proposed setpoints for pressure interlocks do.not meet the staff position requiring interlock setpoints to be below the ECCS piping design pressure (Grand Gulf Nuclear Station Safety Evaluation Supplement 2, Section 6.3.4, NUREG-0831).

You are requested to revise Item 13 of the August 12, 1985, submittal to respond to the enclosed staff positions. Based on its preliminary review, the NRC staff issued a notice in the Federal Register of its intent to amend the operating license.in the manner proposed in the August 12, 1985, submittal. The staff will reissue-the notice in this matter due to the need for substantive changes resulting from its safety evaluation.

In order to include the response to this letter in the new notice, you should submit your response within 30 days of receipt of this letter. Your response should include an analysis of significant hazards conditions for any revised proposal pursuant to Section 50.91 (a) of 10 CFR 50.

In the absence of an acceptable response to this letter, the staff intends to deny the request for license amendment in Item 13 of the August 12, 1985, letter.

Sincerely.

Original signed by ThomasM.Novak Thomas Novak, Assistant Director for Licensing Division of Licensing

Enclosure:

As stated DISTRIBUTION Docket File W. Hodges cc: See next page NRC PDR R. Stevens PRC System V. Panciera

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