I Diablo Nuclear Ii 1LI Pacific LD Electric Paci F Electric
RFQULRY INFORMATION.DISTRIBUTI,SYSTEM(RIDS)NOTARIZED: NO.DOC. DATE: 88/10/27ACCESSION NBR 8811010322Pacific GaFAC I L: 50-275 Diablo Canyon Nuclear Power Planti UnitAUTHOR AFF 1LI AT IONAUTH. NAMFElectric Co.Pacific GasSISK. D. P.Electric Co.Paci i'c GasSHIFFERi J. D.RECIPIENT AFFILIATIONRECIP. NAMEiiDOCKET 405000275LD fSUBJECT:L4 88-009-00: on 880720i two of eight steam generator manwagsdiscovered leaking 4 five manwags showed indications ofseepage. Caused bg Flexite Super gaskets experiencingcomprehensive creep. Gaskets replaced. Ij/881027 ltr.LERDISTRIBUTION CDDE: IE22D COPIES RECEIVED: LTR t ENCL I SIZE:TITLE: 50 73 Licensee Event Report (LER) i Incident Rpti etc. \'EC IP lENTID CODE/NAMECOPIESLTTR ENCLRECIPIENTID CODE/NAMECOPI ESLTTR ENCL1PI)5 PD112.1ACPS MOELLERAEOD/DOA2ACRS WYL RR/DLPG/GABNRR/DPEP/RAB7E10PD5 LA1ROOD H1INTERNAL: ACRS MI CHELSQNNRR/DEST/CEB BH1NRR/DFST/I CSB175'HBENRR/DEST/MTBNRR/DEST/RSBNRR/DLPG/HFB 10NRR/DOEA/E*B 11NRR/DREP/RPB '0NUDOCS-ABSTRACTRES/DSI R/El BFIL E B11FORD BLDG HOYi ALPDRNRC PDR1NSIC HARRISi JNSIC MAYSi G1EXTERNAL: EGOG WILLIAMS 8H ST LOBBY L IAR DTQl AL N )MBER QF CQi ES REQUIRED LTTR42ENCL4111111111
UCENSEE EVENT ItEPOIIT tLEIt) acsLsTT»a»5IABL CCX I 1111oNlaA&la SasSHOST OaTIsOae 11s acsTlaaIa aQsIoF 0oTssls cacsLsTscl ssvoLvco iLIT' ssawlOOCxl sssWIla'IDIABLO'CANYON UNITSaT»sOM%04»lTssslalxosT sl ssss»sTTID ssassT Tocossl aLCVILTssl slossssl»csTTSoxTcols10s 0 0 00s000 IO OSSs'4 xvCT»CSNa»aV» esse as» as TaeC.s ooo323'OF GASKETSSTEAM GENERATOR MANHAY LEAK FOLLOHING COOLDOHN DUE TO USELCS51C0aaxexxsMC SeaVoluntary Report'sss:LIocs»11 cossTacT pos Tss»Lls 11csTILI»Ossl ssaWIalaDAVID P. SISK, REGULATORY COMPLIANCE ENGINEEROOa»LCTICOeeOsslis Ca ss51OSSI LSSSI COS805595IaOss OOX»OSSISST CSSLUSC OCN:SSSIO»a ss si a ITva laCavil LIwssTaL slsoaT cx&ITIo is COOlCOL»OssISSSss1TSSII7351SHOOT 11li»ass ss5alTMSlasltOeTalslTO ssea55 II I 55'Os IssleOa11 CIsssascT aacTs»»sseee Cxel&CO lssles55iOss Oaxli11 s sQC IThis report is being voluntarily submitted for information purposes only, asdescribed in item 19 of Supplement Number 1, to NUREG-1022.Following a cooldown to Mode 5 after 12 months of operation at normal operatingtemperatures, two of eight steam generator manways were discovered to bethefive others showed indications of seepage. Investigation has revealed thatreactormanualthefollowinginception of leakage was during or after the cooldownleaking'ndtrip ofJuly 17, 1988.discussion with the gasket manufacturer (Flexitallic) has disclosed thatthe gaskets being used, "Flexite Super" gaskets, experience compressive creep andloss of resiliency due to changes in the filler material when exposed to hightemperatures (greater than 400 degrees Fahrenheit) for extended periods of time.Subsequentof the "Flexite Super" gaskets showed a greater amount of permanentdeformation than the asbestos-filled gaskets called for in the initial design ofthe manways. This permanent deformation resulted in a loss of manway stud preloadThe "Flexite Super" manway gaskets haveand in leakage when the manway cooled.been replaced with asbestos-filled gaskets in all four Unit 2 steam generators.Examination Iae
ItRCtomSSSAU 9. IIUCLEAR REOULATORY COMM ISSIOlt19@i ILICENSEE EVENT REPORT ILER) TEXT CONTINUA IONA&ROVEO OM4 tIOEXPIRESLfR RUINER DIABLO CANYON UNIT 2Mme e nous@ vwTEXT AI'NI.ni iUnitWIC fenn 'tl00003238 80inHode0 91 1 V IS IQ 4%VVtA0 0OF11711in2 wasHode 5 (Cold Shutdown) and50 percent power duringriA.5RACE ISII ISt OUI aet tALHUVSSAlI50-OIOtSill(%in fthis event.Unit,lwas1at approximatelyvnEvent:voluntarily submitted for information purposes only19 of Supplement Numberto NUREG-1022.This report is beingas described in item1mechanical maintenance pre-outage leak-checkcontainment, a puddle (approximately 10 feetin diameter) of water was observed on the 91 foot level inside thebioshield area. The source of the water was traced to the bottom of theinsulation on steam generator (AB)(SG) 2-2.OnJuly 20, 1988, duringinside the Unitwalkdowna2July 22, 1988, further investigation of the leak discovered on July 20disclosed the formation of crystals in the puddle and the flow path fromClose examination determined the leakSG 2-2, indicating borated water.twoto be coming from the area of theSG 2-2 primary manways (AB)(PEN).OnRemovalleakage.of the insulation from theThe-insulationother indication ofSGwasconfirmed the source of theother SGs, but noleakage was found.manwayspromptly removed from theprimarymanwayJuly 23, 1988, a formal investigation team was formed to develop anaction plan and determine the cause of the occurrence. Boric acidThe vendorsamples were removed for chemical and radiochemical analysis.Oncontacted for a history of similar occurrences and recommendationsfor corrective actions. Examination of the available data indicated thatthe leak had started during or after the cooldown following theJuly 17, 1988 transients. Observations supporting this determination areas follows:wasboric acid crystallization was observeddiscovered on July 20, 1988.1.No2.Chemical and radiochemical.3.firstwhenthe leakagewasanalysis of the samples showed thenearly identical in radioisotopes with that ofsamples from the RCS, therefore the crystals were fresh (less thanweek out of the RCS).crystals tobeboric acid crystals found were soft. The presence of the hotdry ambient conditions indicated that the boric acid crystals hadTheformedrecently.a08
HRC)944)fwm 444AU.4, )IUCLEAA AECULATOAYCOMM)44)O)ILICENSEEENT REPORT (LER) TEXT CONTINUA ONEARPAOVEO OM4 )IOERR)RES5ACILITY )IAME 111OOCAET )IUMEEA LT)LEA )IUMEEA I I55OU)%TUBAL4VM 54DIABLO CANYON UNIT 2TEXT I)T AMCV A nOVrwf. vW aktOcVW )VRC FOrrn ')050004150&)044)4))323 88009AIV5%98VM00OFI )IT)unit had be'en at elevated temperatures from July 4, 1987, toJuly 18, 1988. Hestinghouse stated that due to differentcoefficients of expansion of the materials in the manway closure',the potential'or leakage is greater at low temperatures.4.The5.The leakage pattern around the two leaking manways showed a slowHad the leak been present when thedownward liquid flow pattern.unit was at an elevated temperature and pressure, a steam spraypattern would have been expected. In addition, the presence ofboric acid "snow" woul.d have been expected.6.Containmentsince the last refuelingincreasesin activity.orstepsignificant trendsactivity levelsshowed noJuly 29, 1988, a followup examination of SGs 2-1, 2-3, and 2-4 manwaysidentified leakage on five of the six manways. This leakage had occurredafter the initial examination conduced on July 22, 1988. .OnOnJuly 30, 1988, all Unit 2 SG manway covers were removed and"Flexi te -Super" gaskets were replaced with erable structures,event:components,or systems that contributed to theNoneC.Dates and approximate timesl.July 17, 1988, atfor0717 PDT:ma)or occurrences:Amanual2.July 18,at1313 PDT:Unit3.July 20, 1988, at0130 PDT:Aa1988,reactorreported incooled down toastripwasinitiated2-88-008-00. UnitHode 4 (Hot Shutdown)-.LER2 entered Hode 5 (Cold Shutdown)using natural circulation cooldown.puddle of water was observed duringmechnical maintenance pre-outageleak-check walkdown inside the Unitcontainment.2338S/0064K208
IcllC Fond 999AV 5 CIVCLEAFI AEGVLATOIIYCOMMIENOIC19451LICENSEE EVENT REPORT HLER) TEXT CONTINUA ONOOCIIET FIVINEIIFACILITY IIAME 111IllAFFIIOVEO OMS IIO 3190-0IOCEXFIIIES: 9191/%LEII IILANEA I I55QVIIINTIAI.RVM9% ADIABLO CANYON UNIT 2TEXTIIImere a»ce e novns. uw oaaewel HAC Fare05000323 8800'9 EVC 04N'gMI800G9EA'cl I ITIDuring inspection to locate the leak source,crystallization was observed.4.July 22,5.July 23, 1988:Boric acid crystal samples were removed from thevicinity of the SG 2-2 manways for chemical andradiochemical analysis.6.July 29, 1988:Reinspection of SG manways on the other three SGsrevealed indication of leakage on five of the six1988:-SG7.OFJuly 30, 1988:manways.Initiatedmanwayremoval and inspection of all Unit 2 SGReplaced "Flexite Super" gasketscovers.with asbestos-filled Flexitallic gaskets.8.D.August 11, 1988: Unit 2 entered Modeindication ofSG1(Power Operation).manwayHoleakage.Other systems or secondary functions affected:NoneE.Methodof Discovery:July 20, 1988, during a mechanical maintenance pre-outage leak-checkwalkdown inside the Unit 2 containment, a pudd'le (approximately 10 feetin diameter) of water was observed on the 91 foot level inside thebioshield area. The source of the water was traced to the bottom of theinsulation on SG 2-2. On July 22, 1988, during an inspection to locatethe source of the leak, crysta11ization was observed. Furtherobservation determined the leak to be from the area of the SG 2-2 primaryRemoval of the insulation from the manway covers confirmed anmanways.approximately 'two drop per second leak. The insulation was then removedfrom the other three Unit 2 SGs. Visual inspection of the manways on theother three SGs showed no evidence of leakage.OnF.Operator actions:NoneG.Safety system responses:NoneA.Imnediate cause:Examination of the gasket showed the "Flexite Super" gaskets to haveexperienced a greater amount of permanent deformation than the2338S/0064K'I C FOAM 555c1949108
HLC Sat SERAV E. «UCEEAL REGULATORY COMMIESIOIIIS 41IENT REPORT (LERj TEXT CONTINUA ONLICENSEEARRLOYEO OMS HOEKRIREE. EIEIDOCKET SIV ME E L IE IL E R L VMS E LTEAL323 88DIABLO CANYON UNIT 2TUCT IIT eeee«we e«eeeee. eee oddcsval HLCfern ASA'elIII1 E 0 U E L T I A I.HVM EL01I50&IOelie0 9eEV«K)9HU«ef A000OFllllflexftallfc gaskets called for fn the initial design ofthe manways. This permanent deformation caused a reduction fn manwaystud preload and resulted in leakage when the manway cooled.asbestos-filledRoot Cause:B.PG&Eof the onducted an extensive investigationevent usingacausesof thisFollowing a cooldown to Hode 5 after 12 months of operation at normaloperating temperatures, two of ei'ght steam generator manways werediscovered to be leaking and five others showed indications of seepage. .Investigation has revealed that the inception of leakage was during orafter the cooldown. Hestinghouse, the NSSS vendor, has indicated that,-due to the construction of the manway closure, leakage fs more likely tooccur fn a cooled condition than a hot condition. Subsequent discussionwith the gasket manufacturer (Flexftallfc) has disclosed that the gasketsbeing used, Flexitallic "Flexite Super" gaskets, experience compressivecreep and loss of resf lf ency 'due to changes in the filler materialto high temperatures (greater than 400 degrees Fahrenheit) for.extended periods of time. The Flexi tallf c UFlexi te* Super" manway gasketshave been replaced wi th asbestos-filled gaskets fn all four Unit 2 steamgenerators.when'xposed,The EventInvestigationTeamevaluated potential root causes as follows:Material degradationand the flange face failed to provideof these ver, examination of the gasket showed the "Flexite Super"gaskets to have experienced a greater amount of permanentdeformation than the asbestos-filled Flexftallic gaskets called forfn the initial design of the manways. This permanent deformationcaused a reduction in manway stud preload and resulted fn leakageExamination of studs, gaskets,cooled. Discussions with the gasket manufacturer,disclosed that the gaskets being used, Flexftallfc"Flexite Super" gaskets, experience compressive creep and loss oftoresiliency due to changes in the filler material when exposedforextendedFahrenheit)high temperatures (greater than 400 degreesperiods of time. The Flexftallfc "Flexite Super" gaskets have beenreplaced with asbestos-ff lied gaskets.whenthemanway(F'lexitallfc)2338S/0064K eC S6) I 0ev )eeehas08
IillC SwmU.S, IIUCLEAII IIECULATOIIYCOMMISSIOIISSSA19491LiCENSEE EVENT REPORT (LER) TEXT CONTiNUATiONOOCSET IIUMSEII ItlDIABLO CANYON UNIT 2TEXT M'gece e nearer, oaeocvw'VPC2.%%d 05000AiSIIOVEO OMS ISO SI50-0104EXSIIIES, S/SIISSLtll IIUMSEII I I323SIOUZhTIALhVVSSA8 800 9 ACE ISI IVOIOhhVMSI h0 000OF9 I II TIDesigninitialdesign of the manway wasto replace theadequate.Flexitallicgasket with a newasbestos-filledoriginally designed"superior .performing" replacement gasket, Flexite Super, alsohas been the practice of the plantmanufactured by Flexitallic.to purchase such gaskets as comnercial grade, and to applyappropriate dedication activities (in this case, verification ofreceipt of the purchased gasket, and verification of no leakage).Investigationhas shownHowever, athat thedesign change was madeItFlexitallic Company has not been qualifiedsafety-related vendor under the PGIEE QA program; however,Flexi tallic has stated that they have been supplying gaskets toother utilities under their QA programs;At the present time,as aFlexitallic representatives had full knowledge and concurred withthe decision to install the "Flexite Super" gasket in the manwayclosures. However, their recent experience over the past year ortwo has'ed them to conclude that this type of gasket is unsuitableis an acceptablefor use in this type of closure, althoughaspipe flanges.substitute for less flexible closures suchitMoreover, the substitution of this gasket was not discussed with theThe vendor manway installationNSSS vendor before the fact.for using statedhasthey would not now concur inWestinghousegaskets.in the SG nstallationreview of the installation procedure and the as found conditiondid not indicate any problems with instal'latlon that could havecontributed to this event.A5.MaintenancePreventive maintenance is not performed on the SG manways; however,this fact is not considered to be a contributor to this event.TestingThis eventtesting.2338S/0064KheC19SODOM93I)SSAwasnot caused byamissed, incomplete, or inadequate8
U. , IIUCL4AA 1140ULATOIIY COAIMI 4IOIIIIAC Poem 444A19451 "LICENSEE EVENT REPORT (LER) TEXT CONTINUA IONAPPROV40 OM4 IIO 4150WI044XPI114 , 4141/%550V5h5 ALhVU IA DIABLO CANYON UNIT 2tKXT 1IP mow zsece emes050008 800 9i5V14hhVVAI1000OFaeeaenV rVPC Asm %54 LU 11717.of Li feEndinvolved in this event deteriorates with age and thereare no moving parts to wear out. The compressive creep experiencedby the gasket is not considered normal wear.No componentInappropriate Equipment Operation8.Investigation Team did not find any evidence of improperofequipment. All temperature and pressure cycles wereoperationwithin Hestinghouse provided limits., Although a power-operatedrelief valve did lift during'he pressure transient on July 17, thisrelief lifts at 2335 psig which is well below the RCS safety i,imitpressure of 2735 psig.The EventnlIY.fihEvnleakage and containment activity are constantly monitored. This leak wasdiscovered before being significant enough to contribute to RCS leakage orcontainment activity level. Hestinghouse has stated that heating up themanway increases the stud loading, thus the most likely time for a leak wouldbe during or at the end of a plant cooldown.RCS.the leak developed at full power, containment activity monitors would havedetected the leak and applicable procedures would have been followed prior tothethe leak increasing sufficiently to affect the reactor coolant ailedmonitorsradiationhad increased in volume from the maximum of two drops per second at the timeof discovery, the reactor coolant inventory monitoring system would havedetected the leak and the plant operators would have followed the applicableprocedure to place the unit in a safe shutdown condition. Thus, the healthand safety of the public were not affected by this event.HadIfrrY.iv"Flexite Super" gaskets in all four Unitwith asbestos-filled Flexitallic gaskets.replacedTheB.Other "Flexite Super" gaskets being used in systems heated over 400All other "Flexite Super" gasketdegrees were located and evaluated.locations were determined to be acceptable.C.The SG manwayswill be inspected during the next outage ofvisual inspection of the Unit 1 SGs performed inJuly, 1988, did not show any sign of leakage.in Unitsufficient duration.2338S/0064KhAC OAU 54Al9 4912 SGs have beenA.A108
NRC Pens SSSAU.S. NUCLEAR IIEOULATOIIYCOMMISSIONl94)IL(CENSEEENT REPORT (LERJ TEXT CONTlNUA ONAttROVEO OMS NO S(50&IOiEXPIRES.FACILITV NAME (11POCKET NUMSERQl,YEAR DIABLO CANYON UNIT 2TEXT M'see «wee «o 0o(RATVISK(NNVM («0 90 04VM1nUnit1w)11 bereplaced dur)ng the next1Failed Components:Fl ex'all 3 c gasket:Part Number:Descr1pt1on:LERs on s1m B.None2338S/0064K4 C TO M S49ao (OV(NTIALSl (ITIManufacture:19SJIstAOE (SI,LER NUMSER (Slrefuel )ng outage.1A. The SG manway gasketsD.VI.«Rtacn«HID FormoFlexfte SuperFlex1tal11c GasketCompany390-A029-H01Gasket, Primary Manway Super Flex 2500lar events:9/SIIps'rev1ous0OF08
Pacific Gas and ElectricTompany77 Beale StreetSan Francisco, CA 941064f5I972.7000TAXJames D. ShifferVice PresidentNuclear Power Generation910.372 6587October 27, 1988LetterPGhENo. DCL-88-256.U.S. Nuclear Regulatory CommissionAttn:Document Control Desk20555Hashington, D.C.Docket No. 50-275, OL-DPR-80Docket No. 50-323, OL-DPR-82Re:Diablo Canyon Units1and 2Licensee Event Report 2-88-009-00 -(Voluntary)Steam Generator Hanway Leak Following Cooldown Due .To Use of'askets That Experienced Compressive Creep And Loss ofRes i 1 i encyGentlemen:is submitting the enclosed voluntary Licensee Event Report (LER)regarding steam generator manway leaks that occurred during or after aunit cooldown. This report is being submitted for i nformation purposesonly, as described in item 19 of Supplement Number 1 to NUREG-1022.PGhEThis event has in no way affected the pub'lic's health and safety'.Kindly acknowledge receipt of this material on the enclosed copy ofthis'etter and return it in the enclosed addressed envelope.Sincerely,.cc:D.f/Sh'fer3. B. HartinH.P.B.H.B.M. HendoncaP. NarbutNortonRoodH, VoglerCPUCDiablo K/DY/2167
lI
July 22, 1988:-During inspection to locate the leak source, crystallization was observed. 5. July 23, 1988: Boric acid crystal samples were removed from the vicinity of the SG 2-2 manways for chemical and radiochemical analysis. 6. July 29, 1988: 7. July 30, 1988: Reinspection of SG manways on the other thre
Texts of Wow Rosh Hashana II 5780 - Congregation Shearith Israel, Atlanta Georgia Wow ׳ג ׳א:׳א תישארב (א) ׃ץרֶָֽאָּהָּ תאֵֵ֥וְּ םִימִַׁ֖שַָּה תאֵֵ֥ םיקִִ֑לֹאֱ ארָָּ֣ Îָּ תישִִׁ֖ארֵ Îְּ(ב) חַורְָּ֣ו ם
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