ML19247A262
| ML19247A262 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 06/20/1979 |
| From: | Moody D YANKEE ATOMIC ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| FOIA-79-98 WYR-79-69, NUDOCS 7907300461 | |
| Download: ML19247A262 (4) | |
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$ +1 h(l'?, Afri-I Telephone 417 3:4-9Ctl Tvr 7 t0.J 4 0-073 0 YANKEE ATOMIC El.ECTRIC COMPANY s.4.1.1.
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. June 20, 1979 Cnited States Nuclear Regulator / Cc== ssion Region 631 Park Avenue Iin6 of Prussia. Pennnyiva.nia 19406 n
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Attention:
Scyce H. Crier, Dirw:ter
?.e rerence :
(a) lice::se No. DPR-3 (Oceke No. 50-29)
(b) !.atter Y1IC to USN30 dated April 26, 1979; 1.3cen.4e to 5 I Eul.letic No. 79-C5a (c) letter YIEC to USh7.C dated May B,1379; Additicnal Infe..atien ?.egardi:3 I L E Sulletin 79 06a WY3 79-63)
Oea.: Sir:
.Sub j ec t :
acciti:nal Infor:ation and Responses Relative t: : 4 I Bulletin 79-C5a
- nas seen becur.,ht to our attentica that in ceder to cc:pletc your
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of cur re2pctses to I A E hitetin ~9-06a (Ref. (b) 5 (c))
acci:1 cal infer:a. ice is needed 57 your staff.
As t result cf the e:.t.p 16:1c cf NT:.ewc which were in progre s at tha time er the previcuJ sper cen Yaakee is OcV able tn
- Xpand on P.e infortatic: given t0 date.
The fe:leving, inf or-estic: 13 prcvided as supplerent.11 Oc cur tvc previcus respceses and any review c::u.9 include an integ ation er r.stertal frc= all three scurces.
_ Iter 2 1.9 discussed in roference (b), the prd-may indication of void fct:atica in tbc ra,actcr ccolant sy te:1 i3 1023 of 373003 cverprs$$ure.
In the event that overpressure 13 lest and CYten.91Ve voidin6 cccurs ccoling wiM 50 lest.
'"h its will be true whether Tcrced ficv cr natural c.irculation is being used rer core heat es:cvul.
I.oss or cooling wculd be indicated Oc the coerater by a.i '" scross the ccre in,zcess or 400F, Additicnally, One operste: wculd te alerted to the situatien by rapid increases in t,hc rcra exit, ther:ccouple ta=:eratures.
S.e e=ergency precedures ct !!tnkee 3 c.JO have br en revised to addecss *.he sync c=s of lecs of ecol.f ng tvcid f:r:stien) and al.>.c direct the ope.-, tor 'a cenaul: :ne saturstien percaun curve whica : 22 been ade a ; art cr the affected precedu e.9 r m'r 09 J g L t* / # U
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"nited States Nuclear Regulatory Cc-dssica Page 2 June 20, 1979 ilthough the e=e gency opersting procedures identify the actions for de. sling with loss of cer: cooling they are designed prinarily to prevent tre formatics of voids which would lead to a 1 css of cooling.
In the instance where the cperater ray be unable to prevent voiding, specific instructions a e included in those ecargency procedures ter such contingencies.
These instructions establish al*e mat.'. coolleg =cdes.
Ites !:
l'.1 *ines naving au.c=atic trip valves.Are isol.1ted sinulta=ecusly cn a contain:nent t.wia:12: se uation sir.na.1 of 5 psig (Refer to Technical Specifientien Table 3 5-1 for a cocaleta listi:x of these lines).
The Yanscee Reve a=ergency cpernt'.ng procedures have been revised to instruct One operator to anually initiate a it=ined centain=ent isolaticn f:ll stra a sa fety injecticn acutation due to a Icw pres 4ure conditien.
"his a.nual in i u a t i c.n is
- 1:1:ed c=ly in the fact that two nives, T7-205 (cc: enen: cccling T cm Resctor Ocelan: Pu=ns) and T7J C5 ti,.ary staan :c the F=er::ency Dciler Feed Pump), are not tripped in
-.=- Oc naintain cpersoility of the Reactor Coolant Pumps dad the Eze ;e:07 Soiler Foed Pu=p.,
7.cc: dura.s inecrpcrating tease changss have been revised.
Operations 2--
21 c e im : mining en tce avised PNeedar-s at sessicna teld en
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?,5 P-ccedursi chang:, cecessary to accc= J ish the actions described in Item 5 cf reference (b) e rm trans=1:ted to the operating personnel en May 11 J"9, 712 a Special Ocera ti g 0.mf e.a.
Fer 21 precedure changes were a::reved cc May la,1979 All operaters Fnve been tralned in these eta.= gen duri.2 5 nining 2essicts held on May 17 and 13,1979 nen ?a Ope."3 ting prcCr*du!*ed and trii.ni".A instructicns h3Ve Deen -*VieVed I,o e".s u "o that the cpera00r3 Will not ove.-ride autorr.atic actiCns of 3afety f+atu es, u=1sas :catinued cperaticn of the enginear-d carety raatur 3 w.'1 meult in unsafe plant :enditions.
The inperta.ce of this concem was stre Aed to licensed operatiens persennel curing training held en May 17 and 13, 1979 n -.n d
he to the design of the ECO3 at Yankee Rev, safaty injecticn is initiated in trains 1.c.
cne icv pressure pu=p and ene high p-aasure pump.
Me E::03 utili::es the e trains to previde emergency com :oclina.
S r ect crerati.,g procecures have been reviend and eevised to ensu e that very s:ecific criteria are net befe:9 r =oving a train er any part er a tmin of 2af tey injection punps.
These criteria havo teen addaessed in detail in rarerence (c). Ite: 7b.
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United States Nuclear Regulatcry Cc=sissica Page 3 Ju=e. 20, 1979 Item 7e Reactor coolant pu=p operstica during transients has been addressed in detail in reference (c), item 7c.
Further= ore, wore is curm tly being perfcmed by Yankee and liestinghouse which ray alter pus:p cpersticn during severs transients.
Ita= 7d 7:ergency Operating F-ccedur-s have been revised to ensure that the operntor utI.lises a ecebinatien of plant parameters in evluating prd 7 plant conditions.
The precedures in fact, have actually been modtried to' '
de-scphasize any aliance en pr--asucicer level as the sole indication of
=ain ecolant system conditions. The use of as many primary plant pars =eters as ar available in assessing tranatents has been stressed to 1:,cens ed c;eratces during tra'-"g seasicas held en May 17 and 13,1979 It== 3
..an Orocedur-s hava een reviewed Oc insur' that alip;n=ent ' requirements and cc trels fcr all safety r*1 ate-d valves, necessary for proper c:ers:* cn or engineer *d cafety features, are satisfied.
Procsdures Vere
.-a 7 ew M rcr cor pilanc-with the Tech:.ical Specifications as well as p '. m ? A D 's.
No crocedure rev siens ere ne,cessa y as a result or
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In 2 -- Ecwe Technical Scecificatiens do not r% quire periodic su. ve111ance cf lec?.ed valves.
"'heretcre, procecures were also myieved to ensure
-ha: icciced safety eel 4:ed valves were being subjectac to periedic ir.sc ec :icns.
With th-ex:cepticn of ete va27e, all One lec.ced safety relat d valven were included in existing surveiMance schedules.
'"his one valve as added to the apprcpriate proca:dare for periodic survei'lanc e.
1"he p la. ', switching and tagging procedure was revised to stress the
"*et,um to Servico" r=:uiremects.
Also plant maintenance, testi".6 and r.urvcillance precedure3 involv'.ng F.ngineer:d Safety Featuras have be-n reviewed anc ravtsed aa nene:cary to ensure that they include spec (ric "C.etum to.rervier" r: quire =ents in the Final Ocnd'.tiens.
his effert has baen eccoleted.
All licensed cperatcrs wre trained en the peccedure changes and infor=ed or -* visions made to saintenance, testing and surveillance precedures to address this require ent during rsining seasicna on May 17 and 18,1979 Ita= 9 All Ucensed coeratcrs have besn instructed or the consequences of rgest:.nz engineered safety features anc the offact of this ac:1cn on valves centro 111ng the releace or r-1dicactivity.
"'c.is training van
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perine ri on Ny 17 and 18, 1979.
Furthem ere, preceduce r-visions are in prer.rass to ensure tr.at price to r a etting of engineered sare:y r-atu:,:s, tha valves elcaed to pravent a tranarnr of potentially reA ;15.y1
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Cnited States Nuclear Regulatory Cec =issien P1ge 4 Ju=e 20,1979 radioactive fluids rrt.m contain=ent will remain closed.
The operators wiu be directed to align tbo ocntad--ent Isolation syste= so that any react. of ESF will not cause the opening of trip valves vnien have closed c= the lines =entienec in I*.e: 9 of reference (b).
Referenced procedure charges wtil be completed by July 15, 3979 Na= 10 All =aintenance and test procedures involving ESF have been reviewed and r evised to ine:: ocrate the requi-mm stat (2).aedundant systens are c:erable befcre a system is takert cut of service, (b) sys~e.s are operable wnen eturned t: cervica, and (c) opera:ces are r.ade aware of tre status or t.5ese syste=s.
~hese precedures identiry the Shift Sepervi - -
- P --in m:si :: " :c e-covina and retuM N safety related systa=s to service.
For the majority of ::cocedures :nis
- acuin=ent was already in f rect. This effort has bee.= co=pleted and licensed Opers: Ors have been incarned of the crocedural enanse du:: g
- .m tning sessiens held en."ay 17 and 13,1979 1.stallation of di.ect and dedicatad tale:ncne lines tetween Iankee Rowe and N5.C heac:;uarters nas been in!.:tated by *,he NRC in ac Ordaa.ce wita te 1e: tar, USNRC to I.tE:: er :i/22/79 Of the two direc
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"ect2ated lines prepcaed rar Tanne ?.cwe, the ene fc atir.; Operati:nal 1:f:. 2:icn nas teen installed.
~"ce sec ond, slatec T:e cc = unicating radiotegical and environ =cntal infer =stic: Ouring an e=erpncy is seneduled to 'ce installed by 2epte:cer 1, 1979 A piant ope.mttenal e:to has been issued instructing Opera: Ors en the uso er :nis ec.unications s/ sten and cf ::e require =en: cr notifing the NRC within ens hour frc: the tire : e reac:Or t.i nc* in a ecetrolled ce c ::ected :endit:.:n of cpe.~ation.
,2 An energency Operating Procedure, d.ealing with the ccctrrl cf hyr.rog n i:
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ain ccolcat system has baien revised.
All licensed Operat:rs have ta-n t ained in these changes curing training sessiens on May 17 and 13,
~c. 3 de trus: Ona thia informat. ion is satisfactcry; hcwever, succid ycu havo
- .n y additional question
- , please centact Mr. J. K. Thayer of this office.
Very teuly yours, TA.\\"E ATO.VIO El.EC'*RIC OCM7NAY 4~
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Df E. Moccy Manay.er of Operaticna
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