ML20138C858

Provides Info Re Fire Suppression Pumps.Any Pump Can Be Loaded on Diesel 1E.Pump a Powered from 6,900-volt Switchgear 2TB,Pump B Loaded from 6,900 Switchgear 1TD & Pump C Powered from 44-kV Substation.Diagrams Encl

ML20138C858
Person / Time
Site:	Mcguire, McGuire
Issue date:	10/14/1985
From:	Tucker H DUKE POWER CO.
To:	Adensam E, Harold Denton Office of Nuclear Reactor Regulation
References
TAC-57340, TAC-57341, NUDOCS 8510230070
Download: ML20138C858 (6)

Text

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. l DUKE POWER Gonnwxy P.O.Ito x 3 318 0 CIIAHLOTrE. N.C. 28242 HALH. TUCKER Taternown vuon reassonne (704) 373-4508 nwa. man renerorson October- 14, 1985 i

l Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Attention: Ms. E. G. Adensam, Chief i Licensing Branch No. 4

Subject:

McGuire Nuclear Station Docket Nos. 50-369, -370 f

Dear Mr. Denton:

In response to recent Staff questions on the McGuire Fire Suppression Pumps

design, the following information is provided:

1. Can any fire suppression pump be loaded on the 1E diesel?

Yes. (Please refer to FSAR Table 8.1.2-1 and FSAR Figure 8.1.2-1.)

Fire su'ppresion pump A is powered from 6900 V switchgear 2TB (Unit 2) j while pump B is powered from 6900 V switchgear ITD (Unit 1).

- Figure 8.1.2-1 (Single Line Diagram Typical Auxiliary Distribution l System) shows pump B powered from switchgear ITD. It is physically i possible to power it from diesel generator 1B via 4160V switchgear 1ETB and auxiliary transformer 1ATD.

In Table 8.1.2-1, the blackout load per diesel is 3396 KW. Each fire suppressien purep has a 300 lip motor (225 KW load). Thus, with a

4000 KW capacity on each diesel, there is adequate load carrying capability.

2. For fire suppression pump "C", is the substation part of the grid or can it be separated from it?

i' Fire suppression pump C receives power from a 44 KV substation fed from Riverbend Steam Plant Switchyard. There is no direct connection

between the McGuire Switchyard and the 44 KV System at Riverbend.

. The McGuire 525 KV Switchyard has no direct tie to Riverbend, while the 230 KV Switchyard is connected to Riverbend via the Schoonover 1

and Norman Lines (see attached). At Riverbend. Units 6 and 7 feed the 230 KV Switchyard through step-up transformers 6B and 7B.

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N s Mr. Harold R. Denton, Director Page 2 The 44 KV Switchyard is fed from the 100 KV Switchyard through a tertiary winding on the step-up transformer for Units 1, 2, and 3 or through tie lines such as Mountain Island.

Under normal plant conditions, there is no tie between the 230 KV Switchyard and the 44 KV Switchyard at Riverbend. Units 6 and 7 have the capability to be aligned to the 100 KV yard through alternate step-up transformers 6A and 7A; however, if this alignment is used, breakers to the 230 KV Switchyard are opened and still no direct connection exists between the 230 KV Switchyard and the 44 KV Switch-yard.

This isolation allows a total blackout of the McGuire Switchyard for any reason-fault, natural disaster, equipment failure, etc. ro occur with no consequences to the 44 KV feeder to fire suppression pump C.

Therefore, for any localized blackout situation at McGuire which would cause,the loss of fire suppression pumps A and B, fire suppression pump C would still be available for service.

3. Stability studies - are there quantitative type studies that have been performed that could 6e used to support the " independence" of the substation?

To our knowledge, no quantitative type studies have been performed that could be used to support the independence of the substation.

However,'a record of power interruptions to Fire Suppression Pump C from May, 1975 to November, 1982 (see Attachment 1) shows the 44 KV line to be reliable.

If there are any further questions regarding this area of concern, please call.

Very truly yours, d d c m

Hal B. Tucker RLG/hrp Attachments ,

cc: Dr. J. Nelson Grace, Regional Administrator Mr. Darl Hood, Project Manager U. S. Nuclear Regulatory Commission Division of Licensing Region II Office of Nuclear Regulatory Comm.

101 Marietta Street, NW, Suite 2900 Washington, D. C. 20555 i Atlanta, Georgia 30323 Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station

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, .I Attachment 1 ,

i Record-of Power In'terruption to ?!cCuire C ?!ain Fire Pump Hotor "

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. DATE DIRATOPM CAUSE

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1. }!ay 14., 1975 1 min no indication f

2. June 12, 1975 88 min lighting (

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. Ibvember 22, 1977 -

19 min .no indication i i

4. October 2, 1979 less than 1 min lighting i

5. November 4, 1982 137 min line insulator' failure i L

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