ML20136A990

Forwards IE Input to Congressional Inquiries Re TMI

ML20136A990
Person / Time
Site:	Crane
Issue date:	05/07/1979
From:	Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:	Haller N NRC OFFICE OF MANAGEMENT AND PROGRAM ANALYSIS (MPA)
References
REF-SSINS-3800 NUDOCS 7908070217
Download: ML20136A990 (3)

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MAY 7 1979 i

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MEMORANDUM FOR: Norman M. Haller, Di'ector, MPA FROM:

Dudley Thompson, Executive Officer for Operations Support, IE

SUBJECT:

CONGRESSIONAL CORRESPONDENCE REGARDING THREE MILE ISLAND Enclosed are copies of IE input to the following Congressional inquiries regarding Three Mile Island:

l.

Letter dated 4/5/79 from Cong. R. Schulze (DR 05876)

Proposed reply to Question 1 enclosed.

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2.

Better dated 4/2/79 from Cong. L. Gudger (DR 05881)

Proposed complete reply enclosed.

3.

Letter dated 3/30/79 from Cong. B. Eckhardt (DR 05867)

=-===-

Proposed replies to Questions 1, 2, 3, 5 and 6 enclosed.

Question No. 4 is assigned to NRR. Question No. 7 should be assigned to SP or NRR.

U 4.

Letter dated 4/2/79 from Sen. H. Heflin (DR 05870) g) $g.

=m Proposed complete repay enclosed.

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5.

Letter dated 4/9/79 from Cong. M. Price (DR 05898)

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.1 Proposed complete reply enclosed.

6.

Letter dated 4/18/79 from Sen. D. Stewart (DR 06064) @ wad./

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Proposed complete reply enclosed.

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Letter dated 4/1/79 from Cong. R. Matsui (DR 05879)

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Proposed reply to Question 4 enclosed.

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Letter dated 3/30/79 from Cong. A. Maguire Ee.

Proposed complete rep 6y enclosed.

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This completes our action on the above controlled correspondence.

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Dudley Thompson Executive Officer for Operations Support, IE

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Enclosures:

As stated

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Letter to Reo. Richard T. Schulze

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$25 Ouestion 1.

What effect will the Three liile Island incident have on M

%g nuclear plants presently under construction, in particular the one at Limerick?

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Answer It is apparent that the Three Mile Island incident will affect

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all U.S. power reactors to some degree, but it would be pure m

speculation at this time to try to define just what the effect Nd would be on any specific reactor.

The two reactors at Limerick 5

y are, however, significantly different from the two at Three Ae Mile Island, and it would be reasonable to believe that the Si-

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@d direct effect would be relatively small.

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ges DRAFT 7he Honorable Lamar Gudger

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United States House of Representatives Washington, D. C.

20515

Dear Congressman Gudger:

I am pleased to respond to your letter dated April 2,1979 regarding the status of the Ocenee Nuclear Station operated by Duke Power Company.

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The three units at the Oconee Nuclear Station are pressurized wate'r iesctors and each unit utilines a nuclear steam supply system designed by Babcoc*

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and Wilcox.

The nuclear stean supply syste=s for oconee are substantially 3

identical to the Three Mile Island facility.

Significant differences in W

facility design between Oconee and Three Mile Island do exist in the M

en.ergency power supply syste.=s and the auxiliary feedvater systecs. The M

Oconee units utilize autonitically dispatched hydro units for their

$re e rgency power supply while the Three Mile Island units utiline autecatic a

starting diesel generators.

The hydro units utilized at Oconee have per-ferned satisfactorily as an emergency power source and there are no i:::ediate 65 plans to require 'a change to diesel generators as a source of e=ergency power.

The auxiliary feedvater syste=s at the Oconee units are in the W

process of being upgraded to provide a nuch higher degree of reliability.

Interi= actions have been taken to insu.re that the health and safety of th M

public are not adversely af fected by continued operation of Oconee Units 1 M

and 2 until such time as the modifications to the aucilian feedvater systens are co:pleted.

(Oconee Unit 3 is currently shut down for refueling.)

W The upgrading of the auxiliary feedwater syste=s includes the installation E

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of two noter driven feedvater pumps for each unit in addition to the cur-rently installed sten = driven pu=p.

Additional inforr.ation concerning.

changes in operating procedures and plant syste=s at Oconee Nuclear S.a ion is ou,tlined in Enclosures 1 and 2.

4.24 There bas been no investigation of alleged release of' vaste vat'er ce:taine,g radioactive caterials in the past year.

There was a liquid release at Ocence in January 1977, which resulted in the i= position of a civil penalty y

it the apount of sixteen thousand dollars ($16,000).

A.. s"-a ry of the release and the subsequent inspection activities is provided in Enclosure 3.

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A Tsesident Inspector has been assigned to the station since Decenbar.18, g

1978.

In addition.to.the inspection activities conducted by the Resident M.

Inspector, 24 inspections involving 14 BC ir.spectors were conducted during Jer.uan, February and March of 1979.

During the year 1978, a total of 112 Eg insnections were conducted at Oconee Nuclear Station that involved 25 XRC inspecte rs.

Copies of XRC inspection reports, enforce =ent correspotdence, y

a.md licensee's responses are routinely cade available for review by the m;;

-i.-lic in the Oconee public Library at Valhalla, South Carolina and the E" Q.

hutlicDocumentRoom, 1717 E Street X. W., Washington, D. C.

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Since April 1,1979, va have performed inspection activities on each of the E'

three work shifts at Oconee on a seve.n-day per week basis.

There has been Nl fro = one to three inspectors at the Ocence Nuclear Station each day since Y

this extensive effort began. This inspection eff ort has been pri=arily M

directed at ensuring that appropriate preventative acd corrective =casures E.:

have been undertaken at the Oconee liuclear St.ation as a result of t.he j E@

" lessons learned" at Three Mile Island.

In su=cary, based on our inspection effort and direct ebservations of the Ococee staff's performance, we conclude that with the additional training received by the operating personnel of the Three Mile Island incident and SCE the increased awareness bv the operat. ors of the. m' characteristics m:

ely ope.rator actions in conjunetton with the more conserv... hat a t:.ve p-require t.=.

setpoints that have been implemented, that the facility can be operated sar.,y.

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e trust the above cc::ments are responsive to your inquiry.

If we can be cc-

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of furthed assistance to you or ycur staff, please let me know.

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Sincerely, w'

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Encisoures:

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1. Letter W. S. Lee to H.

0.. Denton dated 4/25/79 ft

2. Letter W. S. Lee to H.

P,. Denten dated 4/26/79 4

3. Surcary of Event and Inspection Ac-ivities N'

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t, NUCLEAR REGULATORY Comt!SSION 4%

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SSINS 3350 ME.MORAXDUM FOR:

F. J. Nolan, Senior Reactor Inspection 9pecialist,1E:3Q FROM:

R. C. Lewis, Acting Chief, Reactor Operations and Nuclear Support 3 ranch, RII

SUBJECT:

D'FUT FOR RESPONSE TO CONGRESSF_AN CUDGER l

The three units at the Oconee Nuclear Station are pressurired water reactors and each unit utilizes a nuclear steam supply system designed by Babcock and Wilcox.

The nuclear stean supply systems for Oconee are subst.antia11y identical to the Th.ree Mile Island facility.

Significant differences i.n facility design between Oconee and Three Mile Island do exis; in the e ergency power supply systecs and the auriliary feedvater systeos. The Oconee units utilize autocatically dispatched hydro units for their er,ergency power supply while the Three Mile Island units utilize automatic starting diesel generators.

The hydro units utilized at Oconee have per-for:.ed satisfactorily as an emergency power source and there are ne i::::ediate plans to require a change to diesel generators as a source of e=ergency power.

The auxiliary feedvater syste=s at the Oconee units are in the process of being upgraded to provide a much higher degree of reliability.

Interie actions have been taken to inse.re that the health and safety of the public are not adversely affected by continued operation of Oconee Utits 1 and 2 until such ti.::>e as the modifications to the auxiliary feedvater syste:s are ce=pleted.

(Oconee Unit 3 is currently shut down for refueling.)

The upgrading of the auxiliary feedvater syste=s includes the installation of two motor driven icedvater pu=ps for each unit in addition to the cur-

, rently installed ste:un driven pu=p.

Additional information concerning changes in operating procedures and plant systems at Oconee Nuclear Station is ou,tline'd in Enclosures 1 and 2.

There has been no investigation of alleged release of vaste wa radioactive caterials in the past year.

There was a liquid release at Oconee in January 1977, which resulted in the i= position of a civil penalty in the anount of sixteen thousand dollars ($16,000).

A.. su==.a ry of T.he release and the subsequent inspection activities is provided in Er. closure 3.

COWACT:

W. T. Cottle 242-4667 l

I l

9

F. J. Nolan f A Resident Inspector has been assigned to the station since Dece=ber 18, 1978.

In addition ~ to the inspection activities conducted by the Resident Inspector, 24 inspections involving 14 NRC inspectors were conducted during January, February and March of 1979.

During the year 1978, a total of 112 inspections were conducted at Oconee Nuclear Station that involved 25 N2C insp ecto rs.

Copies of NRC inspection reports, enforec=ent correspondence, and licensee's responses are routinely 'made available fortreview by the public in the Oconee Public Library at Walhalla, South Carolina and the KRC Public Document Room, 1717. H Street N. W., Washington, D. C.

Since April 1,1979, we have perforned inspection activities on each of the three work shif ts at Oconee on a seven-day per week basis.

There has been from one to three inspectors at the Oconee Nuclear Station each da since this extensive effort began.

This inspection effort has been pri=arily directed at ensuring that appropriate preventative and corrective ceasures have been undertaken at the Oconee Nuclear Station as a result of the

" lessens learned" at Three Mile Island.

In su==ary, based on our inspectica effort and direct observations of the Oconee staf f's perfornance, we conclude that with the additienal trainitg received by the operating personnel of the Three Mile Island incident and the increased awareness by the operatcrs of the S&W characteristics that recuire ti=ely operator actions in conjuncticn with the more conservative setpoints that have been implenented, that the facility can be operated safely.

Ve ~ trust the above cocoents are responsive to your inquiry.

If we can be of further assistance to you er yeur staff, please let me know.

.Cy R. C. hvis, Acting Chief Reactor Operations and Nuclear Support Branch Enc 18sures:

1.

V. S. Lee to K. R. Denton letter dated 4/25/79 2.

W. S. Lee to H. R. Denton letter dated 4/26/79 3.

Summary of Event and laspection Activities E

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Apri.1 25, 1979 i

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t' r. Harold R.

D=nton

.i DirOctor t,

01:100 of Nuclear Rcactor Recttistion

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i U S. Nuclear Dogula tory Commission i

Wa s h :,.n g Lo n,

D.C.

20555 i

Re:

Oconee Nuclear Sta tion 1

I' Dnck e t No,s. ' 5 0- 2 5 9, 50-270, cnd 50-287.'

e Deer.Mr.

Denton:

In the Nuclear p.eef.:latory Commission ars ' meeting cf April 25, 1979, Duke Po'.<er Company committed to. provide a three par-improvement of the emergency fecdwater system a' 0:ones Muel car S:ation.

~h e purpose of this letter is to provide docu-

.;enta t ion, design info..._ation and proj ected inple :.e n ta tion schedules on each of these t.hree parts.

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PAR"' I.

I r.m e d i a t e On April 25, 1979, Duke rower Company in tiated. at Oco..ee Nu cl ea.r Sta tion the f oll ow:.:vj precedural cha.igen to enha.sce the relir.bil:.ty of emergency f eedwa ter sy:. tem.

1.

Thr e.nu tcency feedwat-r nystem in the existin; desi;n for eact. Oconne Unit has a turbine driven emergency feedwater pt=p which supplies 150s of t.he required water to the ctean genera' crc on los s of ma in feedwater.

'J.'he discha.rges of these pumps have been tied togetnar by allg _ ment o' manua.1 valves such that each snd hil of the pumps can supply emersc ncy feedwater to any Occnee s nit requi; iflg i. t.

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2.

Operating pe2 sonnel have been e t.a tioned at each i

j em:rgency f cedwa ter put:.p witn i, direet oc=un ics tion link to t.at unit *5 Control room.

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,Iinistrati i

in the event (w:

14..have been esta.blished se that insa 02 ootn mai.n feedwate D umps.on._::.-n aif; g d-uni r.,

that unit '~s emerg ency fe edwe tor pump will s tart.utenst:. aIIy bac).ed up by remote manus 1 start from the control rocr..

M Lh7-pump tails to start automatically the opersec: stationed a: that' l

p =p will start the pump locally, and has been trcined to do so.

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j In aciditien, the other t.wo availabic cr.ergency f eedwater p.= 3 wi!

be ta et.ed remotely f ro= their unit 's control roots or )ecall'y i; required to provido two more redundant. sou r. cns of f ecdwater to the aCfacted unit.

4.

n;orgency f eedwa ter flow to t.he s tea = generaters vil be e.ssured by the cont rel room operator who has been ersince to ma,intain the ne.: e.s sa ry levels.

PART II.

Onc Week Wi. thin s ti e

,orind ne t, to axceed sevart days f re..

April 25, 19 '/ 9,

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eme ry.:ncy f cedv. a i.e.

sys1..m ar. Oconee vi~21 he reviued is followc:

1.

Emergency f c edwater ptu:p control sys tems will be re iced such tr.a t emer gency f eedwater pumps on c11 three uni will start aute.a ticall y whencyc e les s c f

=>.in f eedvater Oc:: s on any unit.

1 2.

The emergency Ceedvater pump discharge flow will be i

connected to the in terconnection he.de.rs such that each or all l

emergency feedwater pumps can supply water to any unit.

j PART III.

3 to 4 Mont.hs

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1 Within about th.ree to four co.ths, two =ctor drive..

e.=ergency f eedwa ter pt::ps will be added to each unit 'at Ccente' i

with the following design criteria.

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1.

The two elec trically opera ted pu.mps. will provide a minimu:: ef loot desi,gn cap'aci ty f or each unit.

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The design of the pumps and the as sociated equip-ment will be r.e i sm ic.

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The controls f o.: the electric numes will be. ' l..

independent of the integrated control sy s tem".

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.1 4.

The; power supp.' for the pr.ps and controls wil'! be from the,4160 volt safe y re. lated busses.

5.

Piping and valvo.4 ad.4ed will 1.c Luke clans T D31.1-Mr seic=ic de.iirn) which is

<*f like qu O ity to the existing turbi.ne driven c.nerg ener f eeiun ter pump syster..

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The e>:i s '. i ng f * 'dwa ter co..trel valves will be.

utilized thereby previding fc.:

functional f ;.pv pa.hs,te the stcam genera tors on a ach n:.i t..

A preliminary flow diagram of the revised m: tor dricen eme: qency f emdwa *.e: p'::.:p cy :.em is attached.

Last week 'e : : eed w2:h 6euign end rocura.neah Of these systems.

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For reliability nf the Ocone.1 emez gn.1ry fec<h ater system, ere n connectin<j the 3 i:,c harge head 4rr. ot all three cmergency foodvu.er purp versus r.i:1,.:lc p smp cin rn tion for cach unit ha been evalat.ed by the !Jebcock

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.s ny.

Tha spproach ':Ned a WASH-1%0 tuil'ure dann for coepo n<mt a, cc::vanent modo r ontribution 29.

test and mainttit:anco contriltunic:5

'.* 21ues u t.ilized in the i robabi.11ty innd<.41 are approp*:iate te. t.h e Ocon ?.e emer o b t.s in e d w e { u /~. 3 x 10-g e ncy f e water system.

The estimarus per d e.:2nd fcr t.he. single e..:::p sys tem and 2.0 x 10-per acmand c a cor.ser-vative es tin:att wit.h a cross connection cons'dered.

The incre-men tal i::.prov> n.c at t i...- t o r w<>ul 1 t.he n be appro.d ma t.ely 100.

r;acc.a e,n 3 re.fiew of periodic test procbdurd reecrds at f.k:cnae Nuclear S tat.iun fr:. June 19 7 3 on Unit 1, f rc:n August 19 77 on Unit 2 and t rol: Janetry 19 */ 7 on U..it 3 following results c.

neergency f e.Mwa r.e r guap c; er.thility were d eriv ed.

In 67 t e ct.s f er starting au tum.t it.a l ly the. p=ps successfully perf or:.ed 6; time s, which ic 6 f a il ur er, to nu :o:aaticallv

r. tart Jo 6 7. st tu.:- ts,

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'rt i t h th:;ee pumps thus ali.gned, the probabili* y c'

//~Ailure efTat leact one pump 4.o automar.ically start becer.cn

/*'(1/111# o r. / ' f a il.ure.' - e ver 2 3 0 0 e t t <.cn p t r..

As further as suru. e j %..C caQ:.tf, over the c.p:.ating hLutory of occree the cr:.srquncy teet-wa t er p ure.p s ha-te n e.v e r failed t.c. ctart manuellv *ocal'y.

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we concit:dt-that fc the opernt.ing modes doncribed in Parts J or I.

the prob.tbili t ' of failure o~ cmergency f eedvat.ar pape to :*a:.; i i

ven remote.

. a rt ' ! will picride even grea ter accuran::c.

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Mr. Harold R. 'Denton hEB

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h h-Director Office of Huclear Reactor Regulat.icn

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1. N USMRC U

Vtshingtor., DC 20555 e.

o.

Re: OCONEE WCLEAR STATION COCKET HOS. 50-259, 50-270 and 50-267 I

Dear V.r. Canton.

25, 1979 and providing cdditicn 1 in-Suppiceenting my letter of Aprilfor:ation responsive to Staff safety con through e, on page 1-7 of the GMR Status Report to the Cecrt.issien of April 25,1979 Duke Power Ccopany propos es folleving actio.- :

Ins tall cuterne. tic startirs of the interconnected surger,cy feetnster syste= so that all three peps will receive a a.

stsrt signal frw any affected unit. end test tho :Atc. for stability, D2velop and it:plenent operating procedures for initiating

.snd controlling emergency feedvster independet of ICS control.

b.

Implement a hard-vired control-grade reactor trip on loss c.

of rain f eed<ater and/sr turbine trip.

Cer.piete analyses for potential small breaks and develep and 9

implement. operatir,s ins'. ructions to define operator action.

d.

Station in the cor. trol rm an additier.a1 full-time SRO (er previcush licensed SRO with TH1 training) for each operating

't.

chit to assist with guidance and possible eunual, action in case of transients until items a. through d. are co:r.pleted.

1:

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