ML17244A465

Responds to NRC 790406 Ltr Requesting Addl Info Re Sys Mod to Class IE DC Bus Battery Chargers. All Charges Now in Use Have Been Part of Plant Configuration Since 1969.Adequacy of Equipment Presently Under Review

ML17244A465
Person / Time
Site:	Ginna
Issue date:	04/18/1979
From:	White L ROCHESTER GAS & ELECTRIC CORP.
To:	Ziemann D Office of Nuclear Reactor Regulation
References
TASK-06-07.C1, TASK-07-03, TASK-6-7.C1, TASK-7-3, TASK-RR NUDOCS 7904270289
Download: ML17244A465 (4)

Text

REGUL RY INFORMATION DISTRIBUTI SYSTEM (RIDS),

ACCESSION NBR:7900270289 DOC ~ DATE: 79/00/18 NOTARIZED: NO DOCKET FACIL:50~204 BYNAME ROBERT EMMET GINNA NUCLEAR PLANTt UNIT 1p ROCHESTER G 05000200 AUTH AUTHOR AFFILIATION NHITE L ~ D ~ ROCHESTER GAS 8 ELECTRIC IF ~ NAME RECIPIENT AFFILIATION CORP'KC ZIEMANNP 0 ~ L ~ OPERATING'EACTORS BRANCH 2 ff SUBJECTS RESPONDS TO 790406 NRC" LTR REQUESTING ADDL INFO RE SYS MOD TO CLASS IE DC BUS BATTERY CHARGER'LL'HARGES NOFJ IN USE HAVE BEEN PART OF PLANT CONFIGURATION SINCE 1969 ~ ADEQUACY OF EQUIPMENT PRESENTLY UNDER REVIEW ~

DISTRIBUTION CODE! A001S COPIES RECEIVED:LTR 'Q'NCL- 4 SIZE!

TI TLK' GENE RAI DISTRIBUTION FOR AFTER ISSUANCE OF OPERRRTINNP CIC ACIES: 'PQ: M ALL/solP'.; NoFM~

RECIPIENT COPIES LTTR EN L RECIPIENT'OP ID CODE/NAME IES LTTR ENCL" ID CODE/NAME ACTION ~ 05 BC 7 INTERNAL: 0 REG F ILK 1 02'RC PDR 1 2 10 TA/EDO 15 CORK PERF BR 1 16 AD SYS/PROJ 17 ENGR BR 1 18 REAC SFTY BR 19 PLANT SYS BR 1 20 EKB 21 EFLT TRT SYS 1 22 BR INKMAN ENTERNALe 03 LPDR 1 00 NSIC 23 ACRS 16 TOTAL NUMBER OF COPIES REQUIRED i LTTR 38 ENCL 0

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V *w April 18, 1979 II Director of Nuclear Reactor Regulation Attention: Mr. Dennis L. niemann, Chief Operating Reactors Branch 52 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Request for Additiona'l Information R.E. Ginna Nuclear Power Plant System Modification to Battery Chargers for Class IE DC Bus, Letter Dated April 6, 1979

Dear Mr. Ziemann:

Ne have the following response to the questions in the subject request. It should be noted that the "additional" battery chargers described in the proposed change to the technical speci-fications were installed in the plant prior to startup in 1969.

They were added at that time at the request of plant operating personnel to provide additional margin in charger capacity. The installation of the "additional" battery chargers was performed at that time in accordance with the original plant equipment specifications and construction procedures. All the battery chargers now in use at Ginna have been part of the plant configu-ration since power operation began in 1969.

Ne have prepared the following specific responses:

Question 1: Identify the IEEE Standards, and other criteria, and/or basis used to qualify the newly added equipment.

Response: The status of environmental and seismic qualification of all Class IE electrical equipment, including the battery chargers, is currently under review in the SEP program. It is our position that this question is properly addressed within the scope of that program.

ve04aVO A8 1

ROCHESTER G~S PHD EL-CTRIC CORP. SHEET >VO.

Apr il 18, 197 9 Hr. Dennis L. Ziemann Question 2: Regulatory Guide 1. 6 requires that. at least one interlock be provided to prevent an operator error that would parallel the redundant DC systems.

Discuss the interlock provisions incorporated to satisfy the intent of Regulatory Guide 1.6.

ld Response: The functional capability and configuration of the battery charger system meets the requirements of Regulatory Guides 1.6 and 1.32 as described in our submission of October 12, 1978. The D.C. bus tie switch is padlocked open with the key maintained by the shift foreman. Additionally operating pro-cedures require that any time the bus tie switch is closed, in order to use both 75 amp chargers to supply one bus, the feeder fuse to the redundant bus will be removed.

Question 3: Regulatory 1. 75 requires that the circuits and electric, equipment comprising or associated with the Class IE systems and their auxiliary supporting systems be designed to provide physical and electrical independence. Describe the measures that will be taken to assure electrical and physical independence of the redundant IE divisions.

Response: The adequacy of the physical separation of Class IE electrical equipment and circuits is currently under review in the SEP and Fire Protection programs.

It is our position that this question is properly being addressed within the scope of those programs.

Very truly yours, LDW:np