ML20210T012

Summary of 741104 Meeting W/Util,Ebasco & C-E in Bethesda,Md Re NRC Position on Auxiliary Feedwater Sys Design.List of Attendees Encl

ML20210T012
Person / Time
Site:	Satsop
Issue date:	11/11/1974
From:	Oreilly P US ATOMIC ENERGY COMMISSION (AEC)
To:	US ATOMIC ENERGY COMMISSION (AEC)
References
CON-WNP-1726 NUDOCS 8605290594
Download: ML20210T012 (4)

Text

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. ' '5700Utr Gr NOFIDEUR 4,1974 MErDE WrtM APPLICANT REGARDING AIIIITJARY "'" W.sti PEIDRTIR SYS'!1N ,, f;c. . ' : .b..W%

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l .On November 4,1974, representatives of NPPSS, ma= o, and Cembustion - i~

Engineering met with the Regulatory staff in Bethesda. 'this meeting was

held to discuss the staff's position on antiliary feedwater syste design. ,i A list of attendees is attached. . ..;

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' r' We stated ear psition on the design af =~i14=ey feedwater systas. We  ;:/

believe that tNo smiliary feedwater system dwn1d be designed to prwide ,

'a minimum of two independent and diverse trains of feedwater supply. Each j train naast be designed to perform the coglete system function. The system i should be designed to prwide different pump drive mechanisms with diverse 4 power supply sources for the pump drives, the valve operators, and control i j systems for each i=Hvidual subsystem. The piping arrangment should provide

- physical and functional independence between the subsystems. Such a design :_

l assures that the system will withstand a failure of piping, component, power A#

1 supply or control function in the r=Anwtant. systems. Interconnecting piping

' may be prUVided betWeen subsystems with normally Closed valves in the line.

O,These diversity valves principle may for be the manually valve operated operatorsfrom and the control systems.

actuation room,using , the powerm /. -

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.MThe rattamala for se peeltim uns diertsmendi We esplained that we are *

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r ; requiring diversity in the paup drives and power sources to assure a high ,

T,rdegree of reliability.ta-they=i14=ey feeduster system. Since the ==414=ry

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?g feeduster system usy be used for normal reactor startup and sinatdown as well . b as for certain accident conditions, it is subject to more f+6 challenge .

during the life of the plant. Therefore, it must be a reliable systen. Also, '

studies have indicated that the possibility of the loss of onsite power should

{ not be considered unlikely. The possible loss of both offsite and onsite

! sources of AC power was discussed..

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'Ihe auxiliary feedwater system currently proposed for WPPSS Nuclear Projects No. 3 and No. 5 consists of two full-capacity,' motor-driven pumps and AC controls.. Ebasco described a system modification being considered in order ,

f' to meet our position. 1his modification would indd a third full-capacity Z M'

.../ rsystem which has a tinf>ine-driven pump and DC cuatrolsWThis system would '

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be ted maranally when needed for feeduator sigply. gThe amount.of time 3 .. S

,' red for samal operatian and 5t. ray of this systan uns:then mamamfDji 4 m.This

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We gave the in11mrfag emagia'of acceptable auxiliary feeduster systems: one.

~ full-capacity system with a turbine driven pump and DC controls plus a full-capacity system with 4+-W "'i-Mand AC controls.' Pha= a remarked

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1. 4 that the systen described in the PSAR was designed to minimize the location of ~ !$-

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high energy fluid piping in areas of the plant containing safety-related '; -

equipment. We stated that a system using a turbine-driven pump is not the i

only acceptable way to meet car pos,itioru.

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I!nclosure: J' .,

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Attendance List .

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, cc: Washington Public Powei Supply System . .'

Joseph B. Knotts, Jr.

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Richard Q. Quigley

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ATTENDANCE LIST .

NOVEMBER 4, 1974 MEETING WI'IH WPPSS

- Washington Public Power Supply System G. C. Sorensen G. G. Renfro Ebasco R. T. Vickers J. F. Killian Cebustion Engineering C. B. Brinkman R. L. Honigmann V. Adler*

AEC - Regulatory Staff C. Y. Liang C. C. Iong F. Ashe P. D. O'Reilly P. Riehm l

• Part-time attendance

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Distribution:

Docket Fil II. Denton AEC PDR F. Schroeder Local PDR R. Macrary L Reading V. Stello R. C. DeYoung R. Tedesco R. Denise V. Benaroya K. Goller C. Inng D. Muller J. Kastner D. Skovholt G. Lainas V. bbore - D. Ross W. Butler T. Ippolito D. Vassallo S. Pawlicki

0. Parr J. Knight K. Kniel L. Shao A. Schwencer B. Grimes J. Stolz W. Gamill R. A. Clark R. Ballard R. Ireland P. Fine R. Purple T..Novak D. Ziemann M. Spangler P. Collins EP Project Manager - J. Norris R. Vollmer OGC W. Houston R0 (3) .

G. Knighton V. Wilson.

G. Dicker P. D. O'Reilly B. J. Youngblood R. F. Fraley, ACRS (16)

W. H. Regan, Jr. LWR l-3 Reading S. Varga LWR 1-3 File R. W. Klecker G. Lear F. Kantor E. Hawkins T. Johnson C. Stepp

! D. Bernreuter D. Budge l T. Mnjhy R. Kornasiewicz l C. Liang P. Stoddart 1 J. Costello F. Cherney l

P. Chen E. Brooks R. Satterfield C. Sullivan l F. Ashe M. Bolotsky i I. Sihweil C. C. Long i

R. H. Culp P. Riehm H. M. Wilchins L

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