UNITED STATES

NUCLEAR REGULATORY COMMISSION WASHINGTON. D. C. 20555

Docket No. 50-320

Mr. R. C. Arnold Senior Vice President Netropolitan Edison Company 100 lnterpace Parkway Parsippany, ilew Jersey 07054

Dear Mr. Arnold:

April 16, 1980 NRC/Tf.II-80-.064

Subject: :tini Decay Heat Renoval Overpressurization from Steam Generator Burp

~le have re'lie~·Jed the two letters, Tr~I-11-R-1219 dated January 9, 1980, and ~~1-II-R-1134 dated December 17, 1979, concerning precautions to be ta~en in ;>re'lenting the dOHR syste.n from overpressurization due to steam generator " ~urps". In the latter letter, three opticns \'Jere recor.-mended. ihey are: (1) maintain letdown at 1.8 gpm \>lhen RCS temperature is above 15QOf; (~ ) introduce a gas volume of 38.0 cu. ft. at 80 psi and have no lel aO\·m; an.; (3) ,·educe Keactor Coolant System (RCS) temperature to below l lCOf ~i:h the reactor building temperature (RB) maintained above 80°F and nave no letaown. It appears that you reconmend to implement option (3) • ..Je concur, hO\·Jever, we believe that a further study should be perfomed in orde r to de~er~ir.e the best way of achieving and maintaining the RCS and ... 3 _.;:-;>e rature conditions prior to tile tlOHR system operation.

:or.e of our concerns are addressed in the following questions:

a. ;r~: !~: ~ rar.ce is there in ~aintaining the ~B te~;>erature atove ~~;~? ;he ~3 :e~per~~~re has rln3ed from 75°F to S0°F Nith cne ~u~ ~ running, but ~ithout the evaooration cooler f~nctioning (our understanding). With RB pump shut off can the te::~perature climb to higher than 8QOF or do fJns also have to be shutdown? Secondly, how ~ill the RCS temperature be reduced to and ~aintained at 1200F?

0. r Or' .):;,;::;(' 3, it is StJted tha t i etc!O'tiO •·Jill have to !:>e ::;aintained .. in1e Jsi;.g t 1·e ·:1iR ~ntil the ;>r·i~:·ary·systef.1 is below 120°F. This .11: u :.:te sc··e .. as:..:: •11.! the l ~tco~.n line. }:e r"ec;Jest t hat you

.: ~= ~.-,r ~ r- :t: •)n ::, .. r ·~t"nlrilJ : ;.:: ac:bation of ':r.e ·-TSu 'S" loop · .: .. r:-:crl c-:c:i ... !J ~Js~ e.; fo r ·CS :~-;:>e :·at:Jr~ r <:-:Jct.:c, J-; ... n ~o i 2:.1! := . and ::.en .:ctbat~on of the ;·~hR system.

r1r. R. C. Arnold 2 April 16, 1980

Iq conc1usion, we request that the above concerns be evaluated and the results b!! ref"1ected in the r~OHR system operating procedure so as to include appropriate precautions in precluding t~OHR overpressurization from steam generator burps .

cc: See Distribution List

0 rdtul-c.;~z~ ~~n T. Collins

Deputy Program r~anager TMI Program Office

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P. C. Arnold t~etropo 1 i tan Edison Company

11r . G. K. Hovey Director, nu -2 Metropolitan Edison Company P. 0. Box 480 t1iddletown, PA 17057

Mr . J . J. Barton Manager, Site Operations, TMI-2 t~etropolitan Edison Company P. 0. Box 480 Middletown, PA 17057

Hr . R. W. Heward Rad iological Control Manager, TMI-2 Hetropol itan Edison Company P. 0. Box 480 Middletown , PA 17057

:~r. B. El .1m ~ana~er, ?lant Engineering ~etropolitan Edison Co~pany P. 0. 3ox 480 ~i~dletown, PA 17057

:1r . R. F. '.-J i1 son Dire~~or, iechnical Func:ions ~etropolitan Edison Co~pany P.O. Box ~80 ~icdle~o~n. ?~ 17057

Xr. L. W. Hardi ng :u:~r~i ~or of Lic~ns i1g ··_:rJ!.o1::an ~ -::!is:>n .:-· ;..:-.y ? . J. ~J.I. :.;J ··,c.:1:::c .... n , P~ 1;057

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J. 8. Liebenman, Esquire Berlock, Israel, Lieberman 26 Broadway New York, NY 10004

George F. Trowbridge, Esquire Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W. Washington, DC 20036

Ms. Mary V. Southard, Chairperson Citizens for a Safe Environment P. 0. Box 405 Harrisburg, PA 17108

Dr. Walter H. Jordan 881 W. Outer Drive Oak Ri dge, TN 37830

Dr . Linda W. Little 5000 Hermi tage Drive ~aleigh, NC 27612

Karin W. Carter, Esquire 505 Executive House P. 0 . Box 2357 Ha rr isburg, PA 17120

~=~arable :~rk Cohen 512 E-3 Ma in Capital Building Ha rrisburg, PA 17120

~·:y~ ~eiss , Esquire ~;~a L!on, Har::~o n. Rois::~an ~ ,;ciss 1725 I Street , H.W., Suite 5C6 ~ashington, DC 20006

~r. Steven C. Sholly

~~~~~nic~burg , PA 17055

'r. ~ ~;~as ~~rusky

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··.-. '-'Jr•, i n !. L.: .. is oSJ~ 3r~~ford ierrace =hilade1~nia , PA 191~9

:~s. Jane Lee R. D. 3, 3JX 3521 ~t:;rs, rA 17319

Mr. k. C. Arnold fietropol Han Edison Company

Walter W. Cohen, Consumer Advocate Uepartmcnt of Justice Stra\'1berry Square, 14th Floor Harrisburg, PA 17127

Robert L. Knupp, Esquire Assistant Solicitor Knupp and Andrews P. 0. Box P 407 N. Front Street Harrisburg, PA 1710a

John E. Minnich, Chairperson Dauphin Co. Board of Commissioners Dauphin County Courthouse Front and Market Streets Harri sburg, PA 17101

~obcrt Q. ?ollard CIH!!.apcJk Energy Alliance 609 :10ntpcl ier Street Saltimorc, MO 21218

Chiluncey •:epford Judith H. Johnsrud environmental Coalition on Nuclear Power 433 Orlando Avenue State Coll P.~ e. PA 16801

l·is. Fdl•da 5errj'hill, Cha irperson Coal ilion for r:ucl ear PoHer Plant

Pos tpo ne1;;ent ~6 1 0 -; ,·~ndc n Jrive ~:i ~ r.::-;~o~ . ;)£ l S&as

Ho 11y S. t:i·Ck Anti -:;1c l ear Group Representing York . '-2 ~5 W. ?hi 1adelphla Street Yv r~: . ?A 1;.:04

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Hs. Kathy i·1cCaugh in Three Bile Island Al e rt, Inc. 23 South 21st Street Harrisburg, PA 17104

Hs. f·1ar jori e H. Aamodt R. 0. :s Coatesville, PA 19320

f!s. Karen She 1 don Sheldon, Harmon, Reisman & t~E:iss 1725 I Street, N.W., Suite 506 \:ash i ng ton, DC 20006

Earl B. Hoffman Dauphin County Co .• 'I.;Jissioner Dauphin County Courthouse Front and r~rket Street Harrisburg. PA 17101

Govern~ent Publications Section State of Library of Pennsylvania Box 1601 Education euilding narrisburg, PA 17127

Dr. E'd\ ... ard 0. Sh·artz Soard of Supervisors londonderry Tmo~nshi p RFO #1 Geyers Church Road 1\i ddl etown, PA 17057

U. S. Environ~ental Protect ion Agency r.e~ ion III Off ice ATTi~ : U S COC~DW.'.TOR C~r~is S;Jil d 1ng (Sixth Floor) 6th and ~a1 nut Streets Ph il acelphia, PA 19106

Clcphin Cc~n ty Gffice E~ersency ? r:?::c r· r:t:ness

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Mr. R. C. Arnold Hetropol itan Edison Company

Governor's Office of Stat~ Planning and QPvelopment

ATTN : Coordinator. Pennsylvania Clearinghouse

P. 0. Box 1323 Harrisburg, PA 17120

Mrs. Rhoda 0. Carr 1402 Marcne Drive Harrisburg, PA 17109

Mr. Richard Roberts The Patriot 812 11arket Street Harrisburg, PA 17105

Mr . Robert B. Borsum Babcock ~ Wilcox liuclf~a r ?ower Gene rati on Oi vhion Suite 420, 7735 Old Georgetown ~oad Bethesda. MD 20014

Ivan W. Smith, Es quire ~! o~ic Safety and Licensing Board U. S. tlucl,ar Regul atory Comillission hashington. DC 20555

; tc~ic ~af~:y J~d L i c~ns~ng ao~rd ~ane 1 U. S. :;uclcar "= e;:u~.::~or.:,· C~:-.-:~i5sion ~asnington. DC 20555

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Docket ing and Serv ice Sect i on U. S. :luc l car Rc1Julatory Corr:ni $sion ·: ! . ;.- ~· ·· ,, !.>C ':' i1~5 5

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