ML20137X382

Requests Approval to Complete Installation of Automatic Depressurization Sys Manual Inhibit Switches Associated W/ NUREG-0737,Item II.K.3.18 During Spring 1987 Unit 1 & Spring 1988 Unit 2 Refueling Outages

ML20137X382
Person / Time
Site:	Hatch
Issue date:	02/28/1986
From:	Gucwa L GEORGIA POWER CO.
To:	Muller D Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.18, TASK-TM 110C7, SL-367, TAC-45691, TAC-45692, TAC-57309, NUDOCS 8603060178
Download: ML20137X382 (2)

Text

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Georgia Power Company 333 Piedrroit Avenue Atlanta, Georgia 30308 Telephone 404 5264526 t ff e ox 4545 Atlanta Georg;a 30302

- GeorgiaPower L T. Gucwa im soutwvn eecmc system Mana;;er Nuclear Safety and LKensirig Departrrent 0110C February 28, 1986 Director of Nuclear Reactor Regulation Attention: Mr. D. Muller, Project Director BWR Project Directorate No. 2 Division of Boiling Water Reactor Licensing U. S. Nuclear Regulatory Commission Washington, D. C.

20555 NRC DOCKETS 50-321, 50-366 OPERATING LICENSES DPR-57, NPF-5 EDWIN I. HATCH NUCLEAR PLANT UNITS 1 and 2 NUREG-0737 ITEM II.K.3.18: ADS LOGIC MODIFICATION Gentlemen:

By letters dated July 28,1983 (NED-83-398), March 18,1985 (NED-85-125) and August 23, 1985 (NED-85-578), Georgia Power Company (GPC) committed to implementation of Automatic Depressurization System (ADS) logic modifications with the exception of a manual inhibit switch in Hatch Units 1 and 2 during the 1985 refueling outages.

That partial implementation will be completed on schedule.

GPC hereby proposes to complete installation of the inhibit switch during the Spring 1987 Unit 1 and the Spring 1988 Unit 2 refueling outages respectively.

The ADS logic modification, which satisfies the requirements of NUREG-0737 Item.

II.K.3.18, consists of adding a timed bypass of the high drywell pressure permissive after a sustained low reactor water level and a manual ADS

" inhibit" ' switch.

GPC originally committed to implementing the entire modification during the 1985 refueling outages 'but later deferred the manual inhibit switch for reconsideration at a later date.

The inhibit switch, which is intended to prevent ~ automatic depressurization during an anticipated transient without scram (ATWS), was deferred so that its installation could be coordinated with resolution of the ATWS issue.

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Georgia Power h Director of Nuclear Reactor Regulation l

Attention: Mr. D. Muller, Project Director BWR Project Directorate No. 2 February 28, 1986' Page Two The schedule proposed for the installation of the manual inhibit switch is the same as that approved by NRC for ATWS-modifications required by 10 CFR 1

50.62 The proposed schedule also results in installation of the inhibit switch during the first outages following the scheduled implementation of j

Emergency Operating Procedures, thereby providing procedural guidance on use of the switch, i

Based on the above consideration, GPC requests NRC approval of the l

proposed schedule for installation of the ' inhibit switch associated with

~

N11 REG-0737,. Item II.K.3.18 l

Please contact this office if you have any questions.

f Very truly yours, erf7*+ = =

L. T. Gucwa I

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JH/lc i

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Mr. J. T. Beckham, Jr.

j Mr. H. C. Nix, J r.

Dr. J. N. Grace (NRC-Region II)

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Senior Resident Inspector GO-NORMS 1-1 i

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