ML20024G825

Forwards Safety Evaluation Re Aug 1973 Rept on Postulated Pipe Failures Outside Containment for Facility

ML20024G825
Person / Time
Site:	Monticello
Issue date:	07/29/1974
From:	Goller K US ATOMIC ENERGY COMMISSION (AEC)
To:	Mayer L NORTHERN STATES POWER CO.
Shared Package
ML20024G826	List: ML20024G825 ML20024G827
References
NUDOCS 9104300452
Download: ML20024G825 (4)

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Bist ribution I

Docket File i

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JRBuchanan, ORNL Duci.ut no. W-20 TJCarter, L 0R l

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OGC 4 orthern States Tower Company DLZiemann, L 0RB f 2 i

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Mr. L. O. Mayer, Director of JCSnell, L:0RB #2

..uclear Support herviced JJShea, L 0RB #2 414 4tico11ct Mall RMDiggs, LORB $2 1.inneapolis, ttinnesota 55401 Svarga, L:0R Gentlut.cu.

Your letter dated Septeint cr 7,1973, subraitted a report on Postulated lipe f ailutt.u vuti,ido containwat dated August,1973 for the Monticello 9

ancicar Leueratinr, Plant ao required by our letter of December 18,1 72, 16, 1972, and January 16, 1973, con-our letters to you dated December t.atned criteria by which a postulated rupture in any high energy fluid

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piping outsido the prit.ary containtent was to be evaluated to assure on February 5,1973, a meeting was l

safe plant sautdown capaoility.

thee criteria and the rer.ults of your prelit..inary study acid to ch eu..

of cau 4.outicc110 '.sucicar cencratinr,11 ant.

Upon corpletion of our f aitial rev1w of your report, further clarification of the analysis w w requested in our letter of January lb,1974. Your rc4.pont,c to l

i ttila Ict ter wcu dated larch S.1974.

based upon our review of the Lafon.ation you have submitted on the 2.onticel10..ucicar Gebers. ting Plant, wo have determined that af ter con-pletica of the propo6cd saodificatious, the plant would withstand the con-pequences of pootulated rupturca in hign energy fluid piping outside the containmnt without lon of the capability to initiate and u.aintain the p14.ut tu a safe t.autdown conditica. You nave inforuod us that theoc c.od-There ificatic.u ucru cotyleted durJnc tne spriur,1974 refuelint outage.

fore. vc conclude that the 11onticello nucicar Generating riant now corplies with the requirewatu of our Decuber 18, 1972 letter. A copy of our rcInted Safety Lyuluation 16 oncloaud.

Sincerely, OrWin11 # M*1 Or' rid W 3 IM ra.d.t Gouer t

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lnarlR.Goller,AssistantDirector 9104300452 740729 for Operattug Eeactors DR ADDCK 05000263 tirectcri.te of Licenciu;,

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g Sq IREVIOUS YELLoy JOR OTHER CONCURRENCES Safc.t>..v4.ite :.J un y

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Dochet No. 50-203

!!crthern Stater Pcver Co pany ATTNt Mr. L. O. Mayer Director of fluclear Support Servicen 414 Hicollet Mall Minneapolis, Minnesotin 55401 Gentlemen:

Your letter dated Septernber 7,1973, submitted a report on Postulated Pipe railures Outside Contaisent dated August, 1973 for the Mouticello Nuclear Generating Plant as required by our Ictter of December 18, 1972.

Our letters to you dated December 18, 1972, acid January 16, 1973, con-taine d critoria by which a postulated rupture in any high energy fluid pipin;? crateide the pricary containment was to be evaluated to assure uafe plant e.notdwa capability, on February 5, 1973, a neuting was held to discuss the criteria and the recults of your preliminary study of C.c .caticollo 1.ur.1 cur Gracratinrl Plant.

Upon cottpletion of our initial review of your report, fur'ther clarii'ication of the analysis resueuted in our letter of January 18, 1974. Your response to vr this letter was dated March 8,/1974.

Unsed upon our review of ytIur inforst.ation for tue Monticello Nucicar Generating Plant, vc hav6 concluded that the Monticello Nuclear Generating Plant, af ter co:npletion of the proposed modifiestions, will withstand the cour:eqaencer ef,doctuinted ruptures in high energy fluid piping outside the contalicent without lors of the capability to initiate and

.ir.tain saf e ebutacien of the plant. These randifications were ccepleted during the op' ting 1974 refueliuf, outage. A copy of our related Saf ety Evaluntion 1,s e.nclosed.

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Sincerely,

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Earl R. Coller, Assistatit Director for Operating Renctoro Directorate of Licensing

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mty 1lgim stt PREV 10US YELLOW TOR OTHER CONCURRENCES F i erric j en next Iaf0 L:0F L:0R c

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Docket No. 50-263 Northern States Power Company Mr. L. O. Mayer, Director of AT1H Nuclear Support Services 414 Nicollet Mall Minneapolis, Minnesota 55401

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Cantlement oport em Postulated Your letter dated Septecher 7,1973, submitted a1973 for the Menticello Pipe Failures Outside Containment dated AugustNucicar Generat 18, 1972.

f 16, 1973, Our'1etters to you dated Deces6er 18,1972,f nd Jaumarycon

• was ep. 6o es fluid pipi.ng outside the primary ese*=4 On Webruary 5,'

, e easktag assure safe plant shutdown espebility.

vas held to discuss the criteria and the results of your preliminary Upon completion of f

otody of the Monticello Nuclear Cencrating Plant.further clarification of the analysis f

our initial review of your reporti van requested in our letter of January 18, 1974. Your response to this letter was dated liarch 8,1974.

inforuation for the Monticello Nuclear Based upon our review of y'ouCenerating Plant, we have concluded th Generating Plant, af ter/ completion of the proposed modifications, currently scheduled 'or May 15, 1974, vill withstand the consequences without loss of ths' capability to initiate and maintain sa A, dopy of our related Safety Evaluation is enclosed.

of the plant.

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Sincerely, J'

Karl R. Go11er Assistant Director for

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Operating Reactors Directorate of 1.icensing

Enclosure:

Safety Evaluation

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J lbrtherr. Stata l'uwe r Cou.e JUL 2 b d74 cc w/ enclosure:

Anthony Z. Roisman, Esquiro Arthur Ranquist, Require Berlin, Roisman and Rassler Vice President - Iew 1712 N Street, N. W.

llorthern Stater, Power Ce:pany Washington, D. C.

20036 414 Hicollet Hall Minneapolis, Minnesota 55401 Dr. Ed Pryzina Minnesota Pollution Control Agency Gerald Charnoff, Esquire 1935 W. County Road B2 Shaw, Pittman. Potta & Trowbridge Roseville, Minnesota 55113 910 - 17th Street, H. W.

Washington, D. C.

20006 Mr. Gary Wi.lliams Federal Activities Branch Hcuard J. Vogel, Esquire Environmental Protection Agency Knittle 6 Vogel i N. Wacker Drive, Room 822 1154 Last Grain Exchange Building Chicago, Illinois 60606 412 South 4th Street Minnaapolis, liinnesota $5414 s

Environmental Library of 6

Minnesota Steve Gadler, P. E.

2120 carter Avenut St. Paul, Minnesota 55106 s

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banici L. Ficr..tr Esquire Distribution Assistant City Attorney

_ Docket File 647 City.11n11 AEC\\PDR St. h

.paesota 55102 Locd PDR Bran iR ding Warren R. Lawson, H. D.

JRBuc a n, ORNL Secretary & Executive Officer TJCart r, L:0R State Department of Health ACRS 1) 717 Delaware Street, S. E.

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Itinnespolis, Minnet.ota 55440 OG D iemann L:0RB #2 Sandra S. Gardebring. Esquire

CSnell, ORB #2 Minnesota Pollution Control Agency JJShea, L: sGB #2 1935 W. County Road B2 RMDiggs, L a RB $ 2 Roseville, Minnesota 55113 SVarga, L:0R Hr. Kenneth Dzugan, Director Cit;' of St. Paul Pollution Control Services 100 last 10th Street St. Paul, Minnesota 55102

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