ML20107B102
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{{#Wiki_filter:- ( J IhTE: JUL.Y 1ril1973 i. i PEuftlilARI SumW %PMT Q1' SitBBER REPAIR ACTIVITIES ] DURINGSPRino1973 &RJELING OUTAGE i e' e PREPMEDBhi ARTHUR N. Roth e i 9604150344 960213-PDR FOIA DEKOK95-258 PDR
L l TMLE OF CanBUS I. INTRODUCTI m,,,.,,,, '..,,,,,,,,, PAm 1 Ili EQUIP M K DESCRIPTION PAGE2 III. @GMlZATION OF lh!NTBWdE ACTIVITIES.... i PAGEll IV. A W.YSIS.. PAGE7 ....................i....,.. Y., SAFm SIGNIFICANCE Ph 9 F1ams I.................... PAGE10 FisuRE ll P h il FIGuaEIII,...............?.. Pma 32 IABLE I S S S S. S S . S [."...' ? ? ? P h 13 4 e
i ?,: j. (~ INTf0TCTIm AS PART OF THE ItPSERVICE INSPECTIQI PROGAM FOR THE APRIL E73-REFUELING OUTAGES AN INSPECT!Qt OF THE DRWELL If(DRAULIC SHOCK NO SWAY ARREST 0lE (HSSA) WAS CQiDUCTED. THISINSPECTIONREVEALEDTHATA MAJORITY OF die LillTS WERE TOTAL 1Y DEVOID OF FLUID WHIO(( C0flSEQU RESULTED IN THEIR INOPERABILITY. IffE! ATE STEPS WERE TAkEN TO CO#ACT i THE SNtEBER SUPPLIERS BERGEN PATERSON PIPE SUPPORT COMPNN, WHO RECGP PENDED THAT A REPRESEtRATIVE S# FLING OF THE SNUBBERS IN THE DRWEll BE SE?R TO THEIR SHOPS FOR /NALYSIS. 04 MAY 5? B73? THPEE 0) SNUBBERS WERE ' REMOVED FR0i THE MYWEl AND SHIPPED TO THE REX HNNA Caf##s THE SNIEBER MANUFACTURERS FOR l BERGENPATERSON. IHE SNUBBERSI NHIQi HAD BEEN LOCATED dE ON EA04 \\ STEAM litlE #0 ONE ON THE ELECTRs'ATIC RELIEF VALVE DISCHARGE P 1 WERE CUfLETELY DISFWELED NID INSPECTED. IT WAS REPORTED TO JERSEY CEN-TRAL P0iER #iD LIGE CGP#N THAT THE TWO SNUBBERS LOCATED Ql THE fhbl STENi LINES WERE IN A VERY DETERIORATED CONDITION REQUIRiflG C0ffLETE RE-Bull. DING. THE THIRD SNUBBER WAS FOUND TO BE IN SATISFACTORY CQIDITIQ1 REQUIRING OftY HYDRAULIC FLUID ADDITIONS WHIOi IS CONSIDERED NTMAL f%If TE!MfCE. IT SHOULD BE STATED THAT THE TWO FAILED lillTS WERE IN SERVIG LONGER TH#1 THE THIRD MIIOi WAS INSTALLID DURING VIE B72 REFUELING OUTAGE. h3 A RESULT OF 1HIS ItNESTIGATI0ff, !!1EIATE STEPS WERE TAKEN TO REKNE NO REBUILD /LL SNWBERS IN Tr1E DRWE15. KID THOSE SNUBBERS Ill THE RIACTCR BUILD!ilG ASSOCIATED WITH SAFEGUARD EQUIPfETT.
_~ l (e s II, EQJIffEIT ESCRIPTIM ^ o IE ft(DRNILIC SHOCK ntD SWAY ARRESTM (HSSA) UNIT (ILLUSTRATED IN FIGIRE GE) IS USED TO PROTECT PIPING SYSTEMS #tD E2JIPfEffT PIECES SLE-JECT TO POSSIBLE DN%GE FRGi SHOCKS OR VIBRATION. INEFFECT,,WE
- 1 RESTOR BECDfES A RIGID STRUCTWN. fifSER UtIDER IMPACTIVE LMDING C DITIONS.
IN DOING EIS IT IS CAPABM OF TRAfGFERRING LOADS FROM THE PIPING OR EQU!PfENT PROTECTED TO RIGID STRUC1 MAL teEERS, THEARRESTOR IS FURTHER DESIGlED TO KC0ftODATE t0RMAL THERf%L t0VEfEffT OF THE EQ LENT PROTECTED WITH A MIfilful 0F RESIST #1Che THE WIT CONSISTS OF A DOWLE ACT!flG PISTON C AN EXTEP3L VM.VE BLOCK #tD A SPRING LOADED ACCUMUL Tm A FIGUREII). blNG OPERATIQ1s THE PISTON IS FREE TO MOVE UfRESTRICTED IN EITH DIRECT!G4 WlW THE PCFPE~ VALVES REf%INING FULLY OPEN FOR ALL PISTG VELOCITIES UP TO 10 litmES PER M!fiUTE. THIS VELOCITY IS GREATER E NI # OPERAT!QlAL THERf%L GR@flH #tD LESS TH41 THE VELOCITY OF At# tX#1 A l
- fTICIPATED DISTURBillG FORCEi BOTH 1HE COPRESSlot4 AND TENSIQ1 LING POPPET VALVES ARE DESIGNED NID SET FOR CLOSURE MEN WE P OCITY Exmm 10 INmES PER MINUIE. WITH THE POPPET VALVES CLOSED, THE FLUID FLCW IS ESSBff!/LLY STOPPED $ EEREBY TRRISFORMING THE RIGlD STRUCTWE (BOT ABSOLllfELY TRUE, DUE TO THE CUPRESSIBILITY OF THE SILIC0ft FLUIDJ 1.E., M PSI WILL CaiPRESS FLUID TO PERMIT 20 Mid 0F PISTONTRAVEL). O 050RE IS DESIGNED TO BE EFFECTED WITHIfl 1/32-!!!Ci on PISTat RCD TRAVEL.
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= d 4 j IHE SPRING LOA'DED ACCLM1LATOR SERVES AS #1 OIL RESERVOIR TO f%KE UP FOR Sl%LL EXPECTED LEAKS, IN ADDIT!Qb IT SERVES TO KEEP THE HYDRALP LIC FLUID (JIDER PRESSURE, THEREBY ALLOWING THE HSSA TO BE MOUNTED IN A VARIETY OF POSITIQlS'WITH01T THE HYDRAULIC FLUID DRAINII1G OUT OF T CYLINER. IHE WDRAULIC FLUID USED IN THE SNtEBERS IS OF TWO TYPE IS HIG1LY RADIATIQ1 RESIST #fr FOR USE.IN THE DRYWELL[ hE OhE T!0N RESIST #iT Fat USE IN THE BALANCE OF THE PL#N.' IHE TWO Fbj!DS ARE[ RESPECT!WLY, 6.'E.S.F.1154 WHICH IS EWYL )H91YL SIUCes, no GlElS'.Fl- ~ t Y(50) bHICH IS DIETHYL POLYSILOXNE S!LICQlE. SILIC0fE BASE FLUIDS ARE USED BECAUSE BEY /RE f1Gi-FLAf1VBLE[ NOPCORROSlW, CHEMICALLY INERT #lD 4 RELATIVELY STABLE OWR A WIDE TEffERATURE RN4GE. NORMAL #E!ENT TEffERA-TURE R#1GE FOR CQiTINUOUS OPERATIQ1 IS FROM MINuS 309 TO PLUS 00T,' 1 i Au. mE SEALS LGED IN THE SNUBBERS NIE l%DE FR04 ILParr ADIPfEE L-167 Milol !S A POLYUREEANE ELAST0 FEE ADE FROM TOLLIE DkIS POLYETHER LIQUID PREPOLYlER. IESTS VE;t!FY THAT THE SEALS ARE GOOD EVEN kFTER EXPOSURE TO RkDIATIG1 8 IN EXCESS OF 1X10 PoENTGENS. IE TEffERATURE. CHARACTERISTICS OF THE SEklS RE I1 QU 4 Tim /CCORDING TO BERGEf4 PATERSON WE POLYURETHRE SEALS ARE SulTABLE FOR C0f(TINU005 OPERATING TEMPERATURES OF 150 FAAR AT TEffERATURES UP TO 200T FOR " SUSTAINED PERIODS WITHOUT IffAIRMair OF FUNCTION." IHE SEALS SUPPLIER ON THE OTHEFH4fD sky THkT 150 F sH0uLD BE 0 C0iSIDERED THE f%XIfui OPERATING TOTERATURE FOR THE SEALS AND WAT OPERA-TION'AT200TWILLCAUSESEALFAILUPE. PAGE3
IV, MALYSIS r s. IABLE ONE LISTS THOSE StiUBBERS REPA! RED #4D TABULATES THE INDIVI-DUAL COMPOUBUS REPLACED. Ifl ALL CASES, THE SNUBBERS WERE MAEE Ill0PER- 'ABLE DUE TO A LACK OF HYDRAULIC FLUID. THOSE Sl1UBBERS. LOCATED WITH DRfnELL SHOWED SEVERE SEAL' DETERIORATION TO THE Pd!NT OF B 0F RETAINING IUDR/4JLIC FWID EVB1 FOR A SHmT Tite, IT IS f40T RJLLY Nucle AS YET, EITHER THE CAJSE OF SEAL FAILPE OR THE LENGm 0F TIME IT TOOK FOR THE FAIWPIS TO OCCUR. IT I'S FURTHER fl0T LNDERSTOCD WHY THERE APPE/ RED TO BE SAftD, GRIT, DIRT
- E) WATER IN THE ACCU"dATG, OR WHY tWN OF THE ACCtJfJLATOR SPR!!!GS WERE
. BROKEtl. INSPECTION OF THE SEALS INDICATED THAT A POSSIBLE CAUSE OF i MAY HAVE BEEft DUE TO E!THER EXCESSIVE HEAT OR CHBi! CAL ATTACK. PRESSITLY DIS 0 GRIN C06P##, THE SEALS SUPPLIER, !S RUNNING A SERIES OF TESTS HEAT!!!G SEALS IltERSED Ifl WE RADIATIQ1-RESISTNIT HYERAllLIC FWID TO VARIO TEMPERATURES NID (BSERVING THE RATE OF DEGRADATION. IHE!R PRELitilftAR( RESULTS SHOW THAT /eBIBE IRWELL TBfEPATURES Ill CERTAIN AREAS (1650F) ARE HIGH ENOUGi TO CAUSE SEAL D/ftAGE OVER EXT PERIODS OF T!tE. IblEVER, THE BULK OF THE SNUBBERS ARE NWSUBJECT TO TEM-PEPATURES lit EXCESS OF.12fF niD, THEREFORE, SHOULD NOT EXPERIBICE SEAL FAILWE. IO EXPLORE THIS AREA FURTHER, TWO 1HERf0 COUPLES WERE PLACED ON A SNUEBER (SEE FIGWE IID ATT/OiED TO WE IhlN STERI Lite AT A POINT UPSTRE/44 0F THE Ihlft $TENi SAFETY VALVES ON THE NORTH HEADER. THIS SNUBBER WAS CHOSEN BECAlEE IT EMilBITED THE MOST SEVERE S FAILURE, IHE TBfERATLRE OF WE SitUBBER ACCUil)LATCR AT RATED REACTOR PRES-SURE, TEMPERATURE, NiD STE#i FLOW WAS E9 F, WHICH IS WIWIN WE WORK!!5 ~ Pron 7
, e ' RANGE OF THE SEA!J. SHOULD BE P0ff6ED OUT DMT Et. EASURED TENER- - AWRE IS A " SKIN" TEMNRAWRE 4tD IT IS CONCEIV/ OLE WAT THE IfRERfML TEMPERATURE IS HIGiER. IHIS IS POSSIBLE DUE TO SMALL AMPLITUDE VIBRATI0fG BEING C0fNERTED IfR0 HEAT BECAUSE OF FLUID FRICTI0f! Gl WE POPPETS #tD SEATS. ~ IE DAAGifG EFFECTS OF R/DIAT!0N HAS BEBJ RULED OUT SING BO'TH WE SEALS No 1154 HYDRAULIC FLUID ARE HIGLY PADIATION RESISTNIT. IT HAS BEB1 SUGGESTED THAT PERHAPS WE StAJBBERS HAD BE91 STORED OUTSIDE DURifiG BE CONSTRUCTION OF THE PLAf6 NO THIS IS THE REASON FOR DEIR FAILWE. THIS WOULD THEf4 EXPLAIN HOW SNO, DIRT #fD GRIT BRERED THE ACCll1ULATOR. H& LEVERS WE HAVE BEEN ASSURED BY HAROLD ERICKSON O Bence 4 PATERSON THAT THIS WAS fiOT WE CASE. ' HE STATED THAT HE SUPERVISED THE INSTALLATIG10F THE SNWBERS ORIG!fMLLY AfD fultITAlfiS THEY WERE STORED 1 INDOORS AT THE SITE FOR ONLY A VERY Ci' ORT PERIOD OF TIME PRICR TO IfETALLA-TION. A FliMLIZED REPORT FR04 PdX HNUM IS EXFECTED WHIG WILL DETAIL THE RESULTS OF DiEIR llNESTIGATION AS TO WHY THE lil!TS FAILED AS THEY DID AfD L THE!R REC 0ftENDAT10N TO ASSURE THIS WILL tKIT HAPF91 ACAIN IN THE FURlRE. l 1 ) v-J J e d 4 1 P:c 8 ) i .j
(.V. SAETY SIGlIFlfME . e e. 4 TFE SAFETY SIGNIFIC# ICE OF BE SfA1BBER FAILURES IS QUITE PROF 0mD 1 SINCE, IN THE EYDU OF AN EMNQUAKE, to CREDIT COULD BE TAK91 FOR THE i ' SE!SMIC RESTRAINING ABILITY'0F BE UNITS. THECONSEQUENCE3OFLOOSitM i. THIS ABILITY tE m t%Y NOT PRESEf(T A C0f0lTION WHEREBY BE PROTECTED
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CGPONEtiTS WILL FAILJ THIS IS SOLELY DEPBtDCE UPON THE SPECTRAL BE OF THE EARTHQUAKE. THE DYtWilC LO4 DING cal.tSED BY THE EARm00AKE; IN ITSELF. DOES NOT C4J3E APPRECI ABLE STRESSES IN THE PROTECTED SYSTBS U QUENCY OF THE EMTHQUN(E RESULTS IN RESONANT VIBRATION. IN THIS EVEth, THE FAILURE PRCBABILITY IS VERY GREAT SINCE THE UffMMIC LOAD!flG .I FIED QUITE SIGNIFIC# ELY, THE FUf1CT10fl 0F THE SNUBBER IS TO IllCREASE WE RESONNE FREQUEt1 i 0F THE SYSTEM TO A PO!ffT WHERE IT IS WLIKELY THAT AN EARWQUAKE TAIN V! BRAT 10fML EtlERE( IN WIS FREQUENCf RANGE. THIS IS ACC0f BY ADDING Si4VBBER RESTRAlllTS AT P0lt#S IN THE PIPING SYSTB4 WHERE RES0tetR AMPLITUDE IS A f%XI!M1 FOR THE FIRST SIX I m RATION. IN THE FitML #4ALYSIS IT C#4 ONLY BE CONCLUDED THAT THE~ PROBA OF A Coff 0NENT OR SYSTEM FAILURE WAS INCREASED UNDER DESIGN IAS QUAKE CONDITIONS. b o O Fe 9
~.... a. I-6 . (,, ~ Tot James P. 0*Reilly Directorate of Regulatory Operations Region I 970 Broad Street Nevatko New Jersey 07102 i froan Jersey Central Power & Light Company Oyster Creek Nuclear Generating Station Docket 9 $0-219 forked Riveto New Jersey 08721 d i Subjects Abnormal Occurrence Report 73-14 The following is a prelininary report being subnitted in compilance with the Technical Specifications paragraph 6.6.2. 1 ) 9teliminary Approvals
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//ft d Y 1/24/73 f,J. T. Cattolle Jr. h Date cct Mr. A. Giambusso i t ) _3,. n
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(. 7... Da te : 7/21/73 Time: 3:40 a.m. Abnormal Ocsutten:e Report No. 73-14 SUBJECT r Violation of the Technical Specification, paragraph 3.]D, Reactor Coolant System Leakage. Operation of the reactor at power continued when it was not recognized that an increasing Absorption pool tevc1 combined with the rate of leakage into the Drywell Sump resulted in an " unexplained" leak rate in excess of 5 gym. This event is considered to be an abnormal occurrence as defined in Notification of this - the Technical.5pecifications, paragraph 1.158, event as required by the Technical Specifications, paragraph 6.6.2a, was made to AEC Region I, Directorate of Regulatory Operations by telephone on Monday, July 23,1973, at 4:20 p.m., and by telecopier on Tuesday, July 24, 1973 at SITUATION: As indicated in Figure 1, attached, an increasing rate of leakage into the Dryvell Sump began to occur on July 1,1973 and continued through July 19, 1973, teaching a peak of approximately 3.92 gpm when averaged over 24 As shown in Figure 2, attached, a plot of Absorption Pool hours. (Torus) water level developed on July 23, 1973 over the saceperiod indicated the level to be increasing starting about July 11, 1973. It is now 'estinated that the unexplained leak rate increased to >$.0 qvm at some tiac during July 17,1973 and continued to be above the 5.0 gp.n liodt until the plant was shutdown and depressarized on July 21, 1973.
C-CAJSk The cauae ws found to be a feed water h.R a aund one of the feed-water check valve hingc pin seal plugs, which due to its position and the mannet in which the water was sprayingo resulted in leakage to both the Drywell floor and the Totus. Valve data is as follows: Manufactuter: Anchor Valve Company Typer 18" - 600M Swing Check Valve P. S. Materialt Cdst Carbon Steel - Stellite Trim BW ends REMEDIAL ACTIONI The erosion of the seating surface on the valve body was machined out, a minimum wall thickness checked to be satisfactoryo and the plug adapted + to fit. A successful leak test was conducted at operating pressure on and the plant returned to service. s SAFETY SIGNIFICAVCE: The allowable leakage rates of coolant from the teactor system are based in part on predicted and experimentally observed behavior of a cracks in pipes. As noted in the bases of the Technical Specifica-tions, "... ovidence suggests that for leakage somewhat greater than the limit specified for unidentified leakage, the probability is small that imperfections or cracks associated with such leakage would grow rapidly." The Technical Specification limit referred to in the above is 5.0 gpes o in this instance, the maximum leak race approach 6.7S gym of wheteas which = 1.0 gpn might be considered" normal." Thus, the leakage around the ' hinge pin plug was on the order of 5.5-6.0 gpm and consequent 1g no undo significance need be attached to this event. 1
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