ML20086L468
| ML20086L468 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 03/14/1974 |
| From: | Bradley E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086L448 | List: |
| References | |
| NUDOCS 8402080248 | |
| Download: ML20086L468 (8) | |
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March 14, 1974
~
l Mr. it.
C. DeYoung, Assistant Director l
For Light '.iater deactors Group I Directorato of Licensing United Statos Atenic Energy Commission Uashington, D.
C.
20545 Ilc.
Peach Bottom Atcmic Power Station Units' 2 and 3~
Docket !!os. 50-277 and $0-278
Dear Mr. DcYoung:
In response to your letter dated January ll, 1974,
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which we received on January 14, enclosed is the report which you requestec coaling with h,f raulic shocic suppressors d
(snu'obers ) installed at Peach Bottom Atomic Fouer Station Units No. 2 and 3 Very truly yours, i.
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Eugene J. Bradley md Enclosuro f
8402080248 740605 PDR ADOCK 05000277 s
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HF.I' ORT W !!YidAUJ.TC f;:lOOK f UPPRE530h3 (L'lUnl3Sid) l PEACll POTTOM l' HITS 2 /.13) 3 1 ona of the 3!48 bydrau3ic nhoch cupprcct: ora (anubtern) instal 3cd in Peach Ibt.tce.; Unit.c 2 and 31: crc n amfcetured by the Pargen Pctturno:=
Conpany. l.13 but, r.ixl.ec.n rnubinrn 1:cre iccinuftetured by the. ITY Crium))
Corporat.ien.
J ach er the Crinr.cIl unnbb2rs contain nolded polyuretir::na rea3s in the enuhbtr valve, reservoir, nnd fittingn.
Font of the units cc:itain molded po3yt retbr na ucc3c in the hydraulic cylindar cc tiell, thcunh a fc.-
have perc::id -cm od oi.h,? cnc-propyJeno ccala in the hydraulic cyhdw.
f ITT Grinnell bn:. dclu d Philt.dalphia Electric Cur.pr:y th.it the nolded polyurethaua ec: paund dann not contain the'plact.icincrn or other additivec nunticned in the &nunry 11,197h AEC letter froa R. C. PcXoung to i
E. G. Tauer, ilr.
Grhn::1.1 hva nlco advised tht.t it has 1.ce t, dat.a cui,ch-lichinr; tha cornnts):iljty of there natorialc uith the hydraulic fluid used in the enubbers.
It c'Ino reports that ethylenn propy3cnc unterir.lc denonctraic increase:I ten.perature ccpability nnd dentenced compreenicn cet relative to po3yuret.henn. The hydraulic fluid used in all of the snul bers in CE SF-1194 Sixtecn unubberu n:mufactured by lhrvin A..llecren & Co.mpany ::re en the control rod drive insert and uithdrau line bun (Oca inside the prinory containnenta.
Theno cnubbera utilito netallic piston rings inntead of coals"in the cylinders and rint; failure is considered unlih~c3y.
In its 3ct.ter cf January 11,197h the AEC statcc that the use of moldt d polyulethano neals free of additives vill.be acceptable an an interim saanure and nota forth Iequirc:r. ento regarding the increction of
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~2-thene interin neals.
Al t'Lcuch Philadelphia 1;loctric feels that the in:.pect icn verpiirinents an ermerated in the let.ter arc over3y conscr-vative, ve believe that the prograri doncribed in Attacl.r:ent 1 to this report,, i f incorporated in the Technical Specifications for Peach Dotton Units ? sud 3, unuld nat,infy thoce surveillance requirements.
llaned on the recul to of the first year'n surveillance findingn, the Co:qany rould either (1) consider the polyurethanc natorial qualified for the nervice and relax the surveillance frequency from that, identified in Paragraph h.11.D.1 of Attach. tent 1 to that, in Paragra; h h.11.D.? or
(?) continue on the Pnrncraph h.31.D.1 frequency, in ubich cace all pclyurethanc nealc ur>uld be replaced eith othylene-propy]cne materials or the bent other 2r.aterial available at that tiv.c.
After the neal l
ria tcria) in changed, the inspec tions would be ] erronaud on the frequency shown in ParacPaph h.11.D ?, if suitable naterial nualification in a'vitilable, otheruise the innpection frcoucncy of Paragraph b.31.D.1 would continue for a full operat.ing cycle and the results uned to qua3 3 fy the new natcrial no that the inspection could then be perforned on the Paragraph h.11.D.? frequency.
During the pre-eparational demcnstration tent, program, ninor lenhanc from some of the Grinnell snubbers was noticed, however, this leakage unc not related to the nea) nat.crial, but, rat.hcr to loose fit.tini'.n.
Inventi-Cation of the procedures uned to correct, the lenhago problcm led to the conclucion that fac t.ory-net variabi orifices in the valve blocka might have been dinturbed.
Ac a consceptence', a progran uns develcped and in being imple-ncnted for replacing valve blocks on 276 Unubber uniin wi th fact ery-nct an.!
qV V
_3 narked variable orifice ::cttingc.
Test data are availabic to cubstantiate that variab]c orifices on the remaining % Grinnell cnubbers vero not dic-turbed.
The rc}0awrent. valve blocks are bein:; provjded with 3arger f.ind orifices than originally cupplied al3ouing hi:Ler snubber bleed rotec.
Pending installe. tion of the neu valve blecho, the original blocho have been field r.djusted nr.d n crked under clor.c cupervicion and in accordanco uith th':
mnufactuur'c rece:e.:ndatienc.
Ao reported by 1.cicrhen: to Tr. f Drvnner, /J.C Regulatory Operatiom
- Office, Region I, l.: Fr.1!. T. Ullrich, Superintendent, Peach Bottcm Atenic Pouer Station, on January 21,197h, unerpected behavior of coveral cnubloro liac obccrvad dm.ing the Unit No. 2 start-up pipi:q curveillence progr:.:u. A few of the cnubb:ra on the nain steam relief valve and turbine bypacc piping syster.c locked and rectrainnd ther?nl grc.ith follcuing relief valve and t
bypacc valvo opcning., Technical analyccc ucre perforined and it uno datomined tha~t the reculting strccc levolc ucre under Code allouabic.) The enubbero in both of thece piping cyctem ara nou couipped uith neu valve b30chs 7.:'xl.jfied to increace the orifice biced rate and locking velocity to accure reliab3c cnubber operation during a dynmic event and coincident rapid thermal greuth.
All of the other cyctc:nc in uhich cnubberc r.rc installed ucre revicued and it. in concluded that, even under conditions of locked snubberc, the piping configurations and anubber biced rates will allou cufficient themal motion to accum that piping and equiprent overstrcco uill not occur.
In cu=1ag, none of the Peach Bottom Unito 2 and 3 anubberc vero cup-plied by the Ecrgen-Patterson Ceinpany.
The Griru4c31 nnubber fluid lecha *,c van due to loose fittings rat,her than deteriorated ceals. All the p ping j
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's ;nubber:: have been revicued and r.odi.fied application criteria have bee:- 2,nt,ituted to ecoure naticfactory enubber behavior during plant op.r. tiny, d,en ' U c a nd ccir:: d c cond i t !cnr..
l'urthcr.nore, a :,urv0113 nnce progrnN h..: been d :v.,J oped to ec:;ure operaticnal relitibili ty.
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ATTACl!!E!TP 1 Tiun'Fl il:C. i 11hlill ' :t::".3 St
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(:n. t e.. c.:j :I at..ma 1
Derin:: reactor po.er oprrat.len, t.he 1.
All hydraulic c;r:bb'arn.ha t.: Ult d bydraulle. w'1
. ' n:, l : Und on on :.a fe t.y irrel:.ted n;.'ntc.
- h:O h-p:Jc t:, rej at ed pipi:r,: :.. t na.r:st vi!.ca33:e innr.ect ed at the folle. it: -
be og:rable c' cept ::s r, pacified j u frequcncy :
Spoc. 3.11.D.2.
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Uhencycr the reactor in chut doan for '/2 bc. urn er Jcng:r an:!
the unubbern have not 1.0cn inspected for 30 0:.y'.
b.
The i.:: grin.cu j nopeci.t en inierv:1 of accersible unita chall ca (:
NOnth3.
2.
If necca: lble hydrnulic unubhcrn on 2.
If i.he re culla of the :inaptet.Jon cafet.y re] at.:.al :ynt or 3 :o c obn :rved perfon'cd a t. t he frequi nny rt r.ui. red to be ino):er..b3e ai. tinas othcr th.n by Specifienti<,n h.11.D indi.c:.; c the prcccrlhed :,urva:illance, contimad ridiab]e nnubbor opere.Lj on for or.e operat.ica in 'perv.3: :3ble for n periot refunlin;; cycle, the frequency of of neven d::yn.
If the d;fect.lva inapcct. ion can be decrt.aued to cnco snubbers havo ne'. bue.n repaired t 5 t.hin por rcfuel33y; cycle.
that pericd the reactor chall be r, hut.
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3 The reccior chall not, he ntarted 3
Cnco rer operat.inr: cycle a 2.1/2" up uith :.ny cafeL: related cnubbarc nnubber $mutaDed in a 3 ocation knoin to be inoperable, reprenchtat,ive of the nors t.
enviror.r:cntal cenditions chall be reir.oved and disaccc::. bled for the purpone of innrcetion for ceal degradation.
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S e i ni d e livs'r 'ul ic 9 nu'il" rn On Sat s t y 1:" ! :, t e. i S v n t < :....
Ilydr:mlic noubbera tire necennary on nafety related cyntem piping to ren train t.c.i r i tic inot ion and yet allo.i unrestrai ned tiiermal p,reut h.
Should a defective hydraulic unubber be dir. covered during reactor operation neven daya 1:. renconcble t.f mc for repa:T r s.ithout a fic cting operation. Thin al l out.nc e ir juutifiable ninee the probability of a seinnie event during this period is conuidcred lou.
4.11 P.anen D.
S e i r.u i c livJ rulic Snebbern on Sa f et v 1:r t it c d Svnt e:.n A periodic innpect ion in rer,uired t o entablich thaic reli:.bii it y : aid the cor. pat ibil ity of the neal natcrial n uith the hydraulic fluid :oul the upcrat ing envi ron:. ant.
It in considered t. hat continued proper operation t.hrough
, one optrating cycle and natisfactory findings of periodic innpcetionn is nuf ficient jun t-i fi cation to extend the inspection i nterval. The interval of once per operating cycl e will minit:.I::e the effects on pouac operat lon.
,Disaanembly of a snubber installed in a location reprecentative of the vornt. environmental condi tionn uill provide an indication of the degree of hydrualic cylinder coal degradation.
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llotifiention of significent findinca of inopactions o f Ic/draulic i nnbin:rs nhr.)) he n: do pronptly by tel:.phr:no to t.l.
Direct ornic of Licent ing.
.Tr defective cud.1,fra nro idun tified, n tritten report rp;11 le r.ul.i t,ted to the Director, Di rec t.orni.e of I.icensinn ui thin 10 day.; fol lo.:in : con}d otiori of the inupaction.
If i o defect.ive :.nui.berc nra.idontified, the uri t, ten re) art. cnould be cu:n.iitled.;ithin JO days follouit.g the co..ptotion. of the innpact, ion.
2.
'1he written report shoul'd includa:
n.
An approprirte, a doccription of the node of fai' lure, corrective action nnd toutn perfornad to deter.:line the adequacy of the roped 2.
b.
/. doncript. ion of the progr n for ihc develop:ent and nubcequent inu t nliction of a pennanent nedj ri-catic.n to the hydraulic tr.ubbor inntr.11nt,lon to an:.urc proper op. ration.
'ihe description chr,10 d includ:. th : technical bt.uin for Lt.e conclunion tha.1, doriciencien have been reno]vod.
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