AECM-85-0182, Advises of Development of Proposed Schedule for Meeting 10CFR50.44, Final Hydrogen Rule. Proposed Schedule Based on Tasks Identified in Hydrogen Control Owners Group Program Plan

Advises of Development of Proposed Schedule for Meeting 10CFR50.44, Final Hydrogen Rule. Proposed Schedule Based on Tasks Identified in Hydrogen Control Owners Group Program Plan

ML20127K524
Person / Time
Site:	Grand Gulf
Issue date:	06/24/1985
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
AECM-85-0182, AECM-85-182, NUDOCS 8506270474
Download: ML20127K524 (3)

Text

'

, e MISSISSIPPI POWER & LIGHT COMPANY

] Helping Build Mississippi EdlMIMIME P. O. B O X 16 4 0, J A C K S O N. MISSISSIPPI 39215-1640 June 24, 1985 NUCLEAR LICENSING & SAFETY DEPARTMENT U. S. Nuclear Regulatory Ccmmission Office of Nuclear Reactor Regulation Washington, D. C. 20555 l Attention: Mr. Harold R. Denton, Director

Dear Mr. Denton:

1

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416 and 50-417 License No. NPF-29 File: 0260/0272/0756 l

Proposed Schedule for Meeting Hydrogen Rule Requirements AECM-85/0182 On January 25, 1985, the Nuclear Regulatory Commission (NRC) published 10CFR50.44, the " Final Hydrogen Rule". The rule requires Mississippi Power and Light (MP&L) to develop and submit by June 25, 1985, a proposed schedule for 1

meeting the Hydrogen Rule Requirements.

l MP&L has developed a proposed schedule based on tasks identified in the Hydrogen Control Owners Group (HCOG) Program Plan. The proposed schedule is based on a detailed generic schedule recently prepared by HCOG and includes the completion of plant specific work. MP&L believes that completion of work identified in the HCOG Program Plan will satisfy the rule requirements and resolve the degraded core hydrogen control issue for Grand Gulf.

l In developing this schedule, HCOG and MP&L have taken steps to complete as much work as possible in parallel in order to minimize task durations.

l However, many tasks must be completed prior to the initiation of other tasks, making it necessary to identify the critical path for the program. The i attached schedule reflects the end result of this effort.

Several key assumptions were made during the development of the proposed schedule. These include the following: no significant changes to the HCOG Program Plan based on test results and HCOG/NRC interactions, no test program l for drywell analysis, and no additional equipment protection or enhancements to meet equipment survivability requirements.

An integral part of the overall program is the quarter scale combustion testing. The overall schedule is extremely sensitive to any delays in the testing schedule. Because of the magnitude of this testing effort, there are inherent uncertainties in the schedule.

MP&L will revise the schedule based upon unavoidable delays in testing or based upon NRC required changes in the program.

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8506270474 850624 g PDR ADOCK 05000416 p PDR Member Middle South Utilities System s J0P14AECM85060701 - 1 e

4 AECM-85/0182 ,

Page 2 MP&L believes that the information and schedule provided in this letter meet the requirements of 10 CFR 50.44(c)(3)(vii)(a).

Should you have any questions concerning this schedule, please contact us.

Yours truly, L. F. Dale Director MJM/GWS/SHH:dmm Attachment

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-cc: Mr. J. B. Richard (w/a)

Mr. O. D. Kingsley, Jr. (w/a)

Mr. R. B. McGehee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. G. B. Taylor (w/o)

Mr. R. C. Butcher (w/a)

Mr.~ James M.' Taylor,. Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555

.Dr. J. Nelson Grace, Regional Administrator (w/a)

U. S. Nuclear Regulatory Commission Region II 101.Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 6

'J0P14AECM85060701 - 2

9 HYDROGEN CONTROL PROGRAM GENERIC AND PLANT SPECIFIC TASK DESCRIPTION 1985 , 1986

, G3 , G4 , Gi , G2 , G3 , G4 Jun Aug Oct Dec Feb Apr dun Aug Oct

. 1 . f . l . l . I . t . f . t . I HYDROGEN GENERATION EVENT 6 i i  ; i  !  !

SELECT MITIGATION SYSTEM  !  ! CQMPLEiE [  ! j .  !

DESIGN HYDROGEN IGNITION SYSTEM i i i  :  :

CONTAINMENT ULTIMATE CAPACITY  !  ! ChMPLETE  !  !  !  !  !

CONTAINMENT RESPONSE ANALYSIS  ! l ChMPLEjE l l l } l HYDROGEN COMBUSTION TESTING M,  !  :  ; i  ; j HYDROGEN RELEASE HISTORIES 6,  ;  ; i  ! l  !

• CONTAINMENT RESPONSE ANALYSIS '

.. I' i i

• 1/4 SCALE TEST PROGRAM a .

~

, [

l

• DRYWELL ANALYSIS  ; [ [ [ [

M EQUIPMENT SURVIVABILITY PROGRM '

VALIDATION OF ANALYTICAL METHODS [ [ [ i l COMBUSTIBLE GAS CONTROL EPG '

i i  !  :

NEVADA TEST SITE DATA EVALUATION --

, , [ , j l l  !  ;

• THESE ITEMS ARE THE TASKS WITH TASK OESCRIPTIONS ARE PROVIDED IN MORE DETAIL IN THE GREATEST SENSITIVITY TO THE HYDROGEN CONTR0'. 0WNERS GROUP PROGRAM PLAN. UNCERTAINTIES.

____ __ ______________________- _ _ _ _ _ _ _ _ _____ __ _ _ _ -_ . - - _ - - _ _ _ - - - _ _ - _ _ _ _ _ - _ - _ _ _ _