ML20065K206

Provides Clarification of Info Contained in 901019 Application for Amend to License NPF-86 Re Battery Surveillance Requirements

ML20065K206
Person / Time
Site:	Seabrook
Issue date:	11/09/1990
From:	Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NYN-90197, NUDOCS 9011160122
Download: ML20065K206 (2)

Text

y-a i-Mk,3.l I'

New Hampshire i

i

',Yg Ted C. Feigenbaum -

4 y

. President and lI P

54 Chief Executive Officer

"' ~

NYN 90197

.e 1

\\

k; November 9,1990 p

,y g

p4

' United States Nuclear' Regulatory Commission LWashington,7D.C.i 20555 E@i; li lAttenilon:

Document Control Desk :

,4 '

W ' Referencesi (a)

Facility' Operating License No.- NPF-86, Docket No. 50 443 g

4

-(b)

NilY Letter NYN 90i87, dated October 19,1990, " Request for License-Amendment; Battery Surveillance Requirements", T. C. Feigenbaum to g& '

Document Control Desk 1

g' if f

f Suldect:

Request for Clarification.

w --

W" h TGentlemen:

1

!' (

4 1

In reference;(b), NHY submitted n request to delete the requirement that certain y

V%

surveillance' tests be. performed during shutdown. The purpose of this letter'is to provide 0

9.R clarification of certain information contained in nur letter as requested by the staff.=. In our l

ii

_ etter,7,tlY stated thatf the:Seabrook Station. design for vital DC systems incorporates two

&M f

l100% capacity battery banks for each train and that removal of one barcry bank in one train 4

cfrom i service for: the' performance of surveillance testing does not. decrease the-functi.onal L

Jcapabilityx of the' DC L. system i below that level < currently allowed. by the Technical-49 Specifications. The' following clarification is provided.

I The Seabrook Station-DC system configuration employs two busses in each electrical-

train.(i.eJTrain A and Train B)..Each battery bank is normally aligned to supply

one-clectrical vital DC bus but can be aligned?to supply both busses simultaneously within'its-electricali train.. The manual alignment - ot a battery bank to both busses simultaneously requires'that one bus be momentarily (appro 'mately one~ minute) disconnected from. its

. uring1this' momentary interruption this bus will remain energized by.its normal battery.

D

. battery charger. Each battery bank has-the electrical capacity to handle the full 100%' load i

requirements of both vital DC busses within its electrical train. Therefore, each electrical

' train, either 'A-or B,.has the capability to be powered by a single battery bank.

g..

The referenced change indicated that removal-of one (1) battery bank in one (1)-

electrical train-would ' not decrease the functional capability of the 'DC system. while

performing -the-required suiveillance testing. A single battery bank removed from service from -the tested train will not' diminish the ability to provide 100% capacity for the tested train while' performing the required surveillance testing. Additionally, in accordance:with -

Technical Specification ~ requirements,~both battery banks and chargers in the opposite train l

will be operable-during this testing.

b 9011160122 901109 q

PDR ADOCK 05000443 1

P PDC

,.,$ Hampshire Yonkee Division of Public Service Company of New Hampshire

, P.O. Box 300

• Seabrook, NH 03874

• Telephone (603) 474 9521

1. 7 g m

o

' (p s

1 0 }. ' *-

[! '

United States Nuclaar Regulatory Commission November 9,1990 i

Attention:

D-nmer.t Contre.f Desk Page two pr.

The procedures which will be utilized to perform the testing will ensure that the configuration as described above will be in place prior to the performance of the surveillance test.

k

. The Seabrook Station DC vital bus configuration supports the performance of the required battery surveillances at power while maintaining the ability to provide 100% capacity for the tested train.

'4 I -

Should you have any questions regarding this additional clarifying information, please contact Mr. Terry L. liarpster, Director of Licensing Services, at (603) 474-9521, extension l;

2765.

Very truly yours,

.[g( g.hy %da-,

Ted C. Feigenbaum p

TCF:ALL/ssi-t y

cc:

Mr. Thomas T. Martin Regional Administrator United States Nuclear Regulatory Commission Region I..

475 Alicadale Road King' of ~ Prussia,' PA) 19406 Mt. George' L. Iverson, Director Office of Emergency Management

~

- State Office Park ~ South 107 Pleasant Street Concord, NH 03301

- 1 Mr. Victor Nerses-Sr. Project-Manager Project Directorate I 3 -

.. Division of Reactor Projects U.S.. Nuclear Regulatory Commission Washington, DC 20555 Mr. Noel Dudley

.NRC Senior Resident inspector

.P.O. Box 1149 Seabrook,.NH 03874 1

!h,