ML20037C869

Forwards SER Suppl Re Implementation of Improvements to Auxiliary Feedwater Sys.Preliminary Implementation Approval for Item II.E.1.1 of TMI Task Action Plan Is Complete.Two Remaining Open Items Exist

ML20037C869
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	02/18/1981
From:	Clark R Office of Nuclear Reactor Regulation
To:	Withers B PORTLAND GENERAL ELECTRIC CO.
References
TAC-44654, NUDOCS 8103050201
Download: ML20037C869 (6)

Text

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! p,.s.. [,i NUCLEAR REGULATORY COr4 MISSION 2 7 '/

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Mr. Bart D. Withers u.g kgg Vice President Nuclear J

Portland General Electric Company N

121 S. W. Salmon Stree Per: land, Orecon 97204 t

Dear Mr. Withers:

Our letter to you dated Oct:ber 23, 1930 fcrwarded cur Safety Evaluation 0.s::rt (SER) regarding implementati:n of impr:vsments to the auxiliary festwater system for the Trojan Nuclear Plant.

n -hat report, we identified two i: ems as unresolved:

GS-5 and Additional Lor.g Term Recommendation 5.

Based en your response dated December 12, 1980' to -hese unresolved items and our review, these items are now resolved, as ciscussed more fully in the enclosed SER supolement.

.s 'ssuance cf this SER Su: clement, ::;sther with the origir.al SER of

::e-23,1930, :cm::letes the crer:lsmentati:n approval f:r item II.E.i.1

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,, f Robert A. Clark, Chief j

sratir; :eactors Branch #3

.tvision :f Licensing E :':s.:re:

IE: Su::lement

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See next page B10805010\\

i Per land General Electric Coccany ec:

Mr. J. W. Durham, Esquire Senior Vice President and Corporate Counsel Portland General Electric Cocpany 121 S. W. Salmon Street Portland, Oregon 97204 Multnomah County Library Social Science and Science Depar: rent 801 S.W.10th Avenue Portland, Oregon 97205 Michael Malmros, Resident Inspector U. S. Nuclear Regulatory Commission Trojan Nuclear Plan:

P. O. Box 0 Rainier, Oregon 97048 Rocer: M. Hunt, Chai rman Ecard of County Conmissioners Colurcia County 5:. Helens, Gregon 97501

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Donald W. Godard, Superviscr Siting and Regulation Oregon Department cf Energy

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Cece-ber 12, '.930 that the temocrary measures described were no longer needed as the ;ermanant closed cycle self-ccoling water system for providing cooling water to the turbine-driven APn' pump bearing and jacket coolers has been installed.

Thus, the modification described and accepted under GL-3 of our criginal SER has been implemented. The turbine-driven AFW oumo is now cacable of pro-viding the required AFW ficw for as least 0.to hours independant of any AC pcwer dep:rdant water c:ur:e.

Based en our rev'ew, we find the licer.see's respcnse accep:aale.

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_ndati:n - A matcr-driven pump is currently being installed or is planned n

to be installed by the licensee. Present plans are for a non-safety grade r.ctor-dri cen :.mp sys tem.

Based en ;ist experience of the, roblems ::sociated

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s:5:d : -tr:1 ':verspeed trips) of both the diesel and turbine-driven pc ps rd -t ac Li: csee Event Espcets on the

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1. ne if the : Or-driven cu p sh >'d be sa's:y grade and autcmaticailj Sctue by the AFW autcmatic start

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In our cricinal SER of October 23, 1950, we requested that the licensee provide additicnal information on the feasibility of providing emergency po::er to f ) new : tor-driven AFM pu p and a discussica of the procedure requir d to

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ac:: plish this.

e farther requested that the licensee provide additional j;sti#ication for not providing autcmatic initiation of this pump.

In resocase to our concerns, the licensee provided additional information in a letter dated Decerier 12, 1930 as follows:

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Suoplement to,the Sa.fe y Evaluation Recort

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:le e.tation of Recccmendations for the A..al;iry Feedwater Syst;m 1.

Recc-endation GS The as-built piant should be ce'able of providing the required AFW flow for at least two hours from one AF'.! ?;mp train, independent of ry alternating current power source.

If manual AFW system initiatien or flow control is required following a complete loss of al'.cenatir.; current power, emer;ercy procedures should be established for e.a;;aily 1;itiating and control-ling the system under these conditiens.

Since the.;-12e.ce ccoling of the lube Oil for the turbine-driven pu p bearings.3y be decendent on alternating c.

- ' ;:..er, da:ign or procedural char.;es shall be.:.': t: elic.inate this de.2endancy as soon as practicable. 1:ntil this is dcne, ha emergency procafucos sh;uld ; Teide for an individual to be stationed at t?e :c.-bine-driven pump in u

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.v terr resolution of this concern.)".

In cur criginal SER of October 23, 1980, we reouested that the licensee

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. ; tilri.;s and jacket in the ever.t

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In response to our request the licensee indicated in a letter dated

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apability to load the new mot:r-:r'..n 12'.' pump to aithar emer;ency diesei venerator has been orovided.

The pr;ccJu e necessary for accomplis'.ing this requires that the operatcr manipulate three breakers in crder to align the pu p to one of the emergency diesel generators.

Eecause of the large pcwer requirement and high starting current of this pump motor, the emergency busses associated with one diesel must be unicaded, and the diesel generator dedicated to starting the AFW pump.

The diesel is not large enough to support the cor:in-u;.s :;eraticn of this pump assuming all other cu, raipendir.g safety loads cra en tra :: 2 amargency bus. All ESF loads required for.:rmal shutdown must then

' a c a-ated frcm the remaining evergency diesel generator.

Add'tional safety conc rns do not allcw for automatic energization of the ncn-ESF kusses frem the ES

,. hgear.

Thus. the licensas c:'c'udes that no relic'ai' i ;rcismir.: can be 1:::~ lished by autcmatically loadi's and starting the r; pump on the dii:5? generators.

'.'e ccccu r ri-h the '.icansee that auters;ic sading and s : art-

'; :# tha ~otor drivan W :. p..iil.

result ir. iTprwaJ rC.i;bility.: 3r

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Si :5 all ESF icads must te r r.sferre: c one diesel generator..hile startir; the.c cr-criven auxiliary fee: water pum; from the other, the on-site electri:al system for ESF loads is vulnerable to a single failure while in this conditicn.

Therefore, the procedure fer usir.g a diesel generator to power the motor-driven a

AF.. :um; should.cnly be used uncer emergency con itions wherein all safety-grade AF.. :umos have failed to star: in coincicence with a loss of off-site power.

We find the licensee's response acceptable.- The ability to power the motor-criven AFW : ump from either diesel generator is desirable and will provide increased

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s auxiliary feedwater reliability. The existing diesel-driven and steam-turbine-driven AFW pump: will automatically provice adequate AFW flow for a postulated loss of cff-site power condition.

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