ML20107A956
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i August 13, 1973 i
Note to File Pnit.ADELPHIA EVENING BULLETIN, SENIOR T.:CHNICAL EDITORIAL WRITER I received a call Friday af ternoon, August 10, 1973, from the Technical Editorial Writer on the staff of the Philadelphia Evening Bulletin. (I do not recall his name).
1 The Editorial Writer discussed, at reasonable length (30 minutes), the article that they had written regarding the overall situation of the Jersey Centrol Oyster Creek Plant. He stated that his paper supppris Nuclear Power and was concerned that this situation might affect other Nuclear projects in this area particularly the Limerick Project. He indicated that he plans to write on editorial pointing out the slackness of Jersey Centrol and how their actions reflect discredit on the Nuclear Industry.
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He was impressed with the strong action taken by Regulatory. He may say some nice words about Regulatory in the editorial.
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cc: J. G. Davis, RO:HQ J. Fouchard, Public Information 9
e 9604150217 960213 PDR FOIA DEKOK95-258_
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, James P. O*Reilly
. Directorate of Regulatory Operations
' Region'I 631' Park Avenue King of Prussia, Pennsylvania 19406 From:L Jerscy Contral Pcwer & Light Company Oyster Crack Nuclear Generating Staticn Docket MS0-219 0B' Ji Torked Rivor New Jersey
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Subject:
Abnormal Occurrcnca Report 73-17_ _.
The following is a preliminary rcport being sub.r.ittcd' in complianco with the Technicas Specifications
.l paragraph G.6.2.
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.e.s Preliminary.;pprova12 i
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D3te cca Mr. A.IGiambussol.
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Abnormal Occurrence Report No. 73-17 u
SUBJECT Failure of #1 Diesel Generator to start.
This event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15D.
Notifica tion of this event as requitud by the Technical Specificationso para-graph G.6.2.a, was made to AEC Region I, Directorate of Regulatory Operations, by telephone on Wednesday, August 8,1973, at 11:20 a.m.,
and by telecopier on Wednesday, August 8,1973, at 2:40 p.m.
SITUATION:
Whl'le conducting a routine six-month ins' ection of H1 Diesel p
Generator, it was discovered that one of the two starting motors I
occasionally failed to engage consequently preventing the unit r
from scarcing.
I cAuse The engagenent shaft bushing at the pinion end of the starting motor was discovered to have been rotating with the shaft. Due co wear, the bushing had slipped out of position and prevented' j
l the pinion gear from engaging the engine ring gear.
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REMEDIAL ACTION:
A new starter motor was installed and tested satisfactorily.
However, when an operability test was later attempted, the same starter failed to engage requiring realignment of the motor.
r A satisfactory operability test was then conducted and the h6 h
- was returned to service.
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~2-a S_AVETY SIGNIFICANCE Appendix "L" to the TDSAR contains a probability analysis re-garding the availability of standby coo 11n7 systece and includes an analysis of off-site power availability concurrent with a loss of coolant accident.
The results' indicated that the reliability of avallabje power from off-site sources or from a self contalned unit - only one (1) diesel generator was considered in the analysis--
was quite high. Since the station is provided with two (2) sep-arate diesel generator units, having one (1) unit out of service has no offect at all upon the results of the analysis. In addi-tion, the offects of single bus operation during a loss of coolant accident was analyzed in Amendment 32 to the TDSAR and the unit loading under this condition was found to be within the normal
. KVA rating of ths diesel generator.
Thus, there is no additional safety significance associated with this event beyond that already 1 - '-
analyzed.
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s Jersey Central Power & Light Company 1
M ADISCN ' AVENUE AT PUNCH BOWL RO AD e' MoRRiST oWN, N.J. 07963 e f 39 6tt i a
August 6, 1973 s
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Mr.
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Giaubusso Deput'/: Director for Peactor Projectis-
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. Direetcrate of Licensing United States Atemic EnerEy C-insion WashinEten, D. C.
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Dear Mr..Giambusso:
Subject:
Oyster Creek Station Docket No. 50-219 Hydraulic Sheek and Svay Arrester Failure Tre purpose of this letter is to.rormaLLy sue::.it in writing o:.r Summary EcporT,, dated July 16, 1973, en Snubber Repair Activities during the 1973 oyster Creek Refueling Outage. This report v2.3 sent to / cur offica l
earlier in a preliminary form. This report is also respcnsive to Ite:n f
B.2.a to e inclusive in your R. O. Bulletin No. 73-3, dated July 27, 1973.
Also in e.nsvar to Ite: B.2.c all units are of the sama model identifica:ica, ESSA In addition ve wish to advise in writing that the plant exper-ienced the failure of eiEht Hycraulic Shcek and Svay Arrestor units located j
on the Emergency Condenser, Core Spray, Me.in Steam. Feedvater, e:.d Shuthwn l
Ccolin;; systen in the dryvell. This event is censidered to be en abncr:21 occurrence as defined in the Technical Specifications, p:c agraph 1.151.
Notification of this event, as required by the Technical Specifications, paragraph 6.6.2.a, var nade to AEC Region I, Lirectorate of Regulatory Operations, by telephone en Friday, July 27, 1973, at 10:00 a.m.
The plant was shutdown on July 21, 1973 be: tuse of hish uniden-
- tified leakaEe in the dryvell.
It was decided at this tire to perfer en l
inspection cn the dryvcli rnubbers which hsd teen retailt during the Sprins outage.
It. vas_ discovered that ei6 t of the sixty-two dryvell ::,nubt ers h
were cistics hydraulic fluid in varying anounts, thereby resulting in their inoperability. The units involvta are tabulated telev by serial number ar.d lo:atien:
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- Mr. Giambusso August 6, 1973 Serial Number Location 487k91 Shutdown Cooling h87h95 Core Spray h87h99 Emergency Condenser l
487510 Shutdown Cooling h87557 North Feedvater h87561 Emergency Cendencer k87562 Emergency Condenser L8757h Energency Condenser The oil loss has been attributed to seal failure creating a leakage path. The exact mechanism of seal failure is presently under investigation by Disogrin Ccmpany, Bergen Paterson and Eex Hanna.
Based on discussion with Berren Paterson and Eex Hanna at the Oyster Creek site on August 2, two points vere recolnized. Both of the silicone base radiatien resistant fluids (SF1017 and SF115L) ressess an arcastic constituent in their chenical nake-up whien is capable of rep 2 acing out a plasticizer in the sof t millable gum polyurethane seals.
Less of the plastici:er cause both a reduction in seal velu:: and c 100s in sec1 eff::tivence:.
It is believed that prelenged ex-j posure e.; elevated tergeraturas is e factor in this oil atte.ck on the sen]s.
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This point is amplified by notin3 the loceticn of the recent f ailures, six of which were above the biological shield where dryvell temperatures are the 2
gre ates t.
Corrective action was teken by replacing the f ailed units with eight new spares, The significance cf this type failure is in the event of a design bases carthquake no credit could have been taken for the seistic restrain!ng ability of the f ailed units, the prcbability var increased that the piping syster.s affc:ted veuld go into resonant vibration and possibly fail.
i The folleving sur/eillance schedule is proposed:
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Inspect all dryvell snubters ac made available by scheduled or forced chutdowns requiring deir.erting of the dryvell, ex-cepting shutdowns that eccar within a fcur week period.
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We vill increet all drywell snubbers within six vechs from July 28, 1973.
Futurc surveillance schedules vill te based on the results of this inspectien.
Our intentiens vill be made known to the Co_ mission in a timely r.ar.ner.
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The snubber it.specticn vill censist of the follovirc:
a) Hydraulic fluid IcVel cheer.
b) Incre:tica Of yister red f er scratches to indiente paralble r.isnligrr.er.t betvean the red and outbctrd b eari r.g
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. Mr. Giambusso Augus?, 6,1973 j,.
4-4 c) Check to see if eyebolt nut is loose, which vonld indicate unit is free to move.
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Enclosed are-forty (10) copies of this report.
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i Very truly yours,
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' Donald A. Ross Manager, Nuclear Generating Stations j
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1 Enclosures a
cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region I I
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0YSTER CEEK NUQIAR GBEPATING STATIUl IFR.16 a
StifARY EPORT 0'l SEBER EPAIR ACTIVITIES DURIi1G SPRlilG 1973 EFUELillG OLEAGE l
PEPAED BY:
ARDIUR If,' FUE AUGUST 6,1973 f;/;E/g,,..p,d,
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STATIGl SUPERIEEkfT IWlECFiPPfU/AL i'#
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TABLEOFCornEffTS 1.
IfRRODUCTlal...,.,.,
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-11. EQUIPf'B(T DESCRIFTIG1...,. [.... '.. [ [.
PidE2 III. ORGAf11ZATIQ10F IhiffIEfWJCE ACTIVITIES. [ [..Piis4 IV. AJALYSIS....................
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V. SAFETY $1G11FICAf1CE PAGE9 FIGUPE I....................
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Iffff0WCTIW AS PART OF B E IN-SERVICE IllSPECTION PROGRAM FOR THE APRIL B 73 0
REFUELING OLTTAGE, Ni If1SPECTIQ10F THE DRWELL HYDRAULIC SHOCK ND SWAY ARREST 0RS (HSSA) WAS CONDUCTED. IHIS IllSPECTION REVEALID THAT A PAJORITY.OF THE ltilTS WERE TOTALLY DEVOID OF FLUID hMIOi, CONSEQUEfELY, RESULTED IN DiEIR Ifl0PERABIL!'iY.
IffiEDIATESTEPSWERETAKEf1TOCOUACT THE SNUBBER SUPPLIER, EERGEN PATERSON PIPE SUPPORT CaiPRfY, Velo RECGi-a, fEfEED THAT A REPRESEffrATIVE SNPLif1G OF THE SNUBSERS IN.THE DRWELL BE 4
SEffT TO THEIR SHOPS FOR N1ALYSIS, Q1 [hY 5, E73, EREE 6) SNUBBERS WERE REl'CNED FRG4 THE DRWELL i
NO SHIPPED TO THE rex HA!!!A COPNN, THE SflWBER FWl'JFACTURERS FOR BERGENPATERSON. THE SNUBBERS, Ni!Oi HAD BEEN LOCATED OtE ON EA01 Ihlfl,
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STENi LINE NO ONE Of EE ELECTRO % TIC RELIEF VALVE I,iSCHARGE PIPING, i
WEPI C3PLETELY DISMIELED NO INSPECTED.
ITWASREPORTEDTOJERSEYCEM-
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TRAL P0iER MlD LIGHT CCfPNN THAT THE NO SNUBBERS LOCATED ON THE Ihlft STENi Lif1ES WERE lil A VERY DETERIORATED C0fOlT10N REQUIRIflG C0iPLETE FE-BUILDlflG. THE THIRD SNU3BER WAS FOUND TO BE IN SATISFACTORY CQOITIGl e
REQUIR!f1G ONLY HYDRAULIC FLUID ADDITION, WHIOi IS CONSIDERED fl0RfML fMIN-i TEtWEE.
IT SHOULD BE STATED '! HAT BE TWO FAILED UNITS WERE IN SERVICE LQ1GER THA:1 die'ElRD 411CH WAS INSTALLID DURING EE B72 REFUELING OtfrAGE.
AS A RESULT OF THIS ItTNSTIGATION, IfiEDI ATE STEPS WERE TAKEtl TO REtOVE NO REBUILD ALL SNWBERS IN WE DRYWELL N1D THOSE SNUB 3ERS IN THE IDAciOR BUILDING ASSCCIATED WIN SAFEGUARD ECUIPf2fE.
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II. EQUIREff IESCRIPTION THE HYDRNJLIC SHOCK NID SWAY ARRESTOR (HSSA) uMIT (lu.USTRATED IN
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FIGURE ONE) IS USED TO PROTECT PIPl!4G SYSTEMS At0 E0JIPiE1T PIECES SUB-JECT TO POSSIBLE DAMAGE FRai SHOCKS OR VIBRAT10fl.
IN EFFECT, THE ARRESTOR BECOMES A RIGID STRUCTLRAL MEMBER UNDER IffACTIVE LCADIt!G CON-
.DITIONS.
Ill DOING THIS IT IS CAPABLE OF TRAflSFERRitG LOADS FROM THE PIPitlG OR EQUIP EE PROTECTED TO RIGID STRUCTURAL lEEERS. THEARRESTO IS FUTmiER DESIGlED TO ACC0f40DATE t0RIML THERt%L f0VEMENT OF Tr$ EQ fBE PROTECTED WITH A Millit4JM OF RESISTN1CE.
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THE UNIT Cof1SISTS OF A DOUBLE ACTING PISTON CYLif0ER APRN1GEISIT, AN EXTEPf4AL V/LVE BLOCK AfD A SPRING LOADED ACCUMUL TOR ASSEtEL1 FIGUREII).
DJRING OPERATION, THE PISTON IS FREE To tOVE UtlRESTRICTED IN EITHER DIRECT 101 WITH THE POPPET VALVES REMAIN!flG FUU.Y OPEN FOR ALL PISTON VELOCITIESUPTO10IllCHESPERMif1UTE. THIS VELOCITY IS GREATER THAtl NT(
OPEPATIONAL THERMAL Gf(OGi NO LESS THAN THE VELOCITY OF ANY f!CRMLLY ANTICIPATED DISTURBING FORCE. BOTH THE COPRESSION NO TEt!Slai C0ffTROL-LING POPPET VALVES ARE DESIGt!ED NID SET FOR CLOSURE hHEtt THE PISTCN VEL-4 OCITYEXCEEDS10litCHESPERMitlUTE. WITH THE POPPET VALVES CLOSED, EE FLUID FLOf IS ESSENTi ALLY STOPPED, THEREBY TRA'iSFORillNG THE UNIT Iffr0 A RIGID STRUCTURE (NOT ABSOLUTELY TRUE, DUE TO THE CJPRESSIBILITY OF THE SILICON FLUID) 1.E., 3000 PSI' WILL CUPRESS FL1JID TO PERMIT 20 MILS OF PISTONTRAVEL).
CLOSURE IS DES!GlED T0 BE EFFECTED WITHIN 1/32-INCi OF PISTCtl ROD TRAVEL..
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o. EQUIPPBIT 1SCRIPTION - C0ffTINUED s TPE SPRING LOAI)ED ACCLf ULATOR SERVES AS N1 OIL RE9ERVOIR TO PAKE UP FOR SPALL EXPECTED LIAKS. IN ADDITION, IT SERVES TO KEEP THE HYDRAU-LIC FLUID UflDER PRESSURE, THEREBY ALLOWING EE HSSA TO BE MOUf ED IN A VARIETY OF POSITIQlS WITHOUT THE HYDRAULIC FLUID DRAlfilf4G OUT OF BE CYLINDER. THE HYDRAULIC FLUID USED IN THE StitBBERS IS OF TWO TYPES) GiE hMIbH IS HIGHLY RADIATIQJ RESISTN4T FOR USE IN THE DRYWELL, WE OTHER.NON-RADIA-TION RESISTNIT FOR USE If1 THE BALAf4CE OF THE PLNIT. THE EO FLUIDS ARE, RESPECTIVELY, G.'E.S.'F.1154 v><Ioi IS rEmYL PHENYL SILIC0flE, No G.E.S.'F' - ~ ~ ~ 96(50) kei!CH IS DIFEWYL POLYSILOX^.f;E SILICalE. SILICONE BASE FLUIDS ARE USED BECAUSE THEY /RE fl0N-FLAfEABLE, N01-CORROSIVE, CHEMICALLY IllERT hiD RELATIVELY STABLE OVER A WIDE TEMPERATURE RNIGE. NOPPAL AtBIErlT TEMPERA-TURE R/NGE FOR CONT!!1UOUS OPERATION IS FRG4 MINuS 309 TO PLUS 4009 ' ALL THE SEALS USED IN WE SNUBBERS ARE f%DE FRG4 DJP0ffT ADIPfEE l.-167 WHIOi IS A POLYURETWJJE ELASTOMER fMDE FRQ4 TOLUNE DIISOCYAf1 ATE POLYETHER LIQUID PREPOLYFER. TESTS VE,lIFY WAT THE SEALS ARE GOOD EVEfl AFTER EXo0SURE TO RADI ATICU 8 IN EXCESS OF 1x10 RDENTGEf15. THE TEf9ERATURE 'CHARACfERISTICS OF THE SE LS ARE IN bUESTI0ft AT THIS TIME. ACCORDIf4G TO BERGm PATEPs0N EE POLYURETHR E SEALS ARE SUITABLE FOR C0tfTif1000S OPERATING TEPPERATURES OF 150 F NO ARE CAPABLE OF OPERATING AT TEf PERAT'JRES UP TO 200T FOR "SUSTAlf1ED PERIODS WIBOUT If?AIP!4EffT OF 4 FUf1CTION." IHE SEALS SUPPLIER ON THE UTHEP<iN;D SAY THAT 150 F SHouLD BE CQ1SIDERED THE f%XIMUM OPERATING TEMPERATURE FOR BE SEALS AND THAT OPERA-T101AT2009WILLCAUSESEALFAILURE. Prce 7
f; .) III. ORGAlIZATIGl 0F FAliElA1E ACTIVITIES B A. EIV/AL A'lD EI:lSTALLAil01: BECAuSE OF THE HIGi RADIATION LIVELS PRESEtIT DIROUGiOUT TEE DRYWELL, IT WAS NECESSARY TO ORGN11ZE die REF0 VAL ACTIVITIES SUOi THAT THE TIfE EXPENDED PER SN'JBBER RBWED WOULD BE A MIN!!UM. IT WAS THOUGHT W AT THIS COULD BEST BE ACCU 4PLISHED BY DIVIDir1G THE IRYWELL IffTO VOLllES NID REtWING THE StitGBERS ON TdlS BASIS. THE SilUBBERS RS0VED FRGi THE VOL-UME COULD THEtt BE REBUILT N1D MADE READY FOR REINSTALLATI0il IN A BATOi, THIS WOULD THEll ASSURE THAT THE SiluBBEPS COULD BE TAKEN, WITHOLTT CONFUS10ff, TO THE AREA 0F THEIR REINSTALLATIQ1. TO FURWER FACILITATE THE REltlSTALLA-TIQ1, LARGE IDEtiTIFICATIGl flUtGERS WERE CLIARLY MARKED Oil T11E SNUBBER N1D M0LliTING PLATE WHICH ALLQ'IED THE WORKERS TO QUICKLY f%Toi THE SNUBBER TO ITS ASSOCIATED iMITING PLATE. B. l%IiilElA1E ACTIVITIES: THE REBUILDING AREA WAS LOCATED ON 95' ELIVATIGl Ill WE REACTOR BUILD-ING AND WAS DIVIDED lilTO THREE WORK STATIQ1S. THERE WAS A DISt% TITLING NO CLIN 11NG STATION, A REBUILDING STATION, #1D A UNIT QUALIFICAT101 STATION. THE FOLLOilflG IS A DESCRIPTIQl 0F THE ACTIVITIES PERFORMED AT EACI STATION.
- 1. DISlWITLING N1D CLEN!!!!G STAT 10tl THE PURPOSE OF THIS STATIG1 WAS TO RBOVE NN CQiTAMit! ANTS NID RESIDUE FR04 WE SNUBBER ASSSBLIES, BOTH EXTERNALLY NO !!TTEPJ1 ALLY.
IN ADDITION, IT WAS-conal!ENT AT TdlS T!!E TO INSPECT NO RECORD THE AS FOUND CalDITIQ1 0F THE St1UBBERS. AFTER DISASSEfBLY THE StrJ3BER PARTS WERE GIVFJ FIRST A DICTY THEN CLEN1 WASHING IN lll-IR! CHLOR 0ETHNIE 0'r53) SOLvErn. THIS PARTICULAR SOLVErff WAS CHOSEN BECAUSE IT LEAVES 110 P2SIDUE /49 IS l'Gl-Pars 11
D 3 u Ill. OlG4112ATIQ10F MAlliTENANCE ACTIv!TES - fof.TillusD l.- T0XIC. IT WAS ALSO REQUIRED TO SCRAPE Af!D/0R WlRE BRUSd die REMAlflDER OF THE SEALS OFF OF BEIR SEATS til PREPARATIQ1 FOR REASSEMBLYc Ill t%f# CASES, IT WAS ALSO REQUIRED TO PRESS OUT THE BRASS BUSHlflG N!D WIPER RING IN THE OUTBOARD BEARING BECAUSE OF INITIAL MISALIGTEffT BETWEErl THE PISTQ1 ROD #1D BEAR!ilG HOUSING. THE MISALIGflPBlT CAUSED SCRATailflG OF die CHR0f E-PLATED PISTON ROD NID die SOFT BRASS BUSHi!!G. 2. REBUILD!flG STATIGl {. IN ORDER TO ASSURE PAXIMUM RELI ABILITY FOR die REBUILT SilUBBERS, IT WAS DESIRABLE TO PERFORM DIE REBUILDING OPERAT!Gls U'lDER THE CENIEST CQlDITIONS POSSIBLE. SINCE THE REBUILDillG WAS PERFORf ED UNFER FIELD CGi-DITIONS, EXTREME CARE HAD TO BE TAKEN TO V. :P DIRT, GRIT AND DEBRIS OUT OF THE REBUILDING AREA. THIS WAS ACC04PLISHED BY REQUIRiflG A DAILY CEAN-UP OF THE REBUILDING AREA AfD A DAILY CHNIGING OF THE VfdlTE BLOTTER PAPER COVERit:G THE REBUILDillG STATIG1 TABE. THE CENILil:ESS CRITERIA WAS FUR-THER AIDED BY THE RADIATIG1 PROTECTIG1 REQUIREf' SITS vfdlCH RE0'JIRED COTTO:1 AND PLASTIC GLOVES TO BE WORN BY IflDIVIDUALS ITNOLVED IN THE REBUILDING ACTIVITIES (SEE ATTAOiED DETAILED REBUILD!flG PROCEDURE). 3. BlIT QUALIFICATIG1 STATIQ1 AFTER REBUILDitlG, THE UNITS WERE BROUCHT TO THE Mi!T GUALIFICAT!G1 STATIQ1 hMERE THEY WERE FILLED WITH HYDRAULIC FLUID NO CPERAT10flALLY TESTED. THIS WAS ACC04PLISHED BY FORCillG FLUID U:OER PRESSURE BROUGi N1 AEMITE FITTlil3 IlCC THE ACCa4ULATOR CAVITY VfdIOi !!1 'lurJi FLG!ED INTO THE f%IN CYLifDER. IHE UNIT WAS THEll " STROKED" USING A PNEU*% TIC DEVICF PAGE5
7.! ) .Ill. ORGAN!ZAT!G10F fAlfGENAfEE ACTIVITIES - Col.TINUED a TO ASSURE THAT NT( TRAPPED AIR WAS FORCED Iffr0 WE ACCUMULATOR VMIG COUJ) BEN BE BLID OUT THROUGH THE FILL PLUG. AFTERITWASASSLRED THROUGH A REPEATED FILLillG A!O BLEEDillG PROCEDJRE THAT THE UNbT WAS PRO-PERLY FILLED, IT WAS /sGAlfi STROKED, AT 10 illmES PER MINUTE, TO VERIFY THAT BUTH THE TEllSIQ1 NO COMPRESS 10fl VALVES ACTUATEDPROPERLY, THEREBY TRNISFORf11NG THE UNIT Iffr0 A RIGID STRUC7URE. FINAU.Y, THE UNITS WERE TRANSFERRED TO A TEMPORARY STORAGE AREA WHERE THEY WERE PLACED ON CLENl BLOTTER PAPER FOR A 211 HOUR PERIOD. AT THE EfD OF THIS PERIOD, IF EERE WAS fl0 EVIDENCE OF OIL SPOTT!flG ON THE BLOTTER PAPER, THE UNITS WERE TRANSFERRED TO THEIR AREA 0F RElflSTALLA-T101. IF CPOTTING OCCLRRED, THEY WERE CHECKED FOR L",!'S NID REPAIRED J ACCDRDlflGLY. A TOTAL OF 9 UNITS WERE REJECTED Oft mis BASIS, 8 0F VH!m WERE REPAIRED. THEOmERUNIT,ITWASDISCOVERED,inDASMALLCRACKIN BE f%IN CYLif0ER NO WAS REPLACED lil TOTAL BY A flew ltllT. o FACE 6
I) ) ~~ IV. A'lALYSIS TABLE ONE LISTS THOSE SillBBERS REPAIRED N1D TABULA TS THE INDIVI-DUAL C0f?0NEtlTS REPLACED. lil ALL CASES, WE SffJBBERS WERE P/CE Ifl0PER-ABLE DUE TO A LACK OF HYDRAULIC FLUID. IHOSEStlUBSERSLOCATEDWITH!tlTHE DRYWELL SH0 LED SEVERE SEAL DETERIORATION TO THE PO!!iT OF BElflG lilCAPABLE OF RETAINIfiG HYDRAULIC FWID EVEtl FOR A SHUiT Tite. IT IS NOT FULLY PJ10% AS YET, EITHER BE CAUSE OF SEAL FAILURE OR WE LEt1GTH OF T!f'E IT TOOK FOR >THE FAILURES TO OCCUR. IT IS FURTHER fl0T UNDERSTOOD WHY THERE APPEARED TO BE SNID, GRIT, DIRT NO WATER IN THE ACCLNULATm, OR WHY tWN OF THE ACCUMULATOR SPRiflGS WERE BRCICfl. INSPECTION OF 11iE SEALS IllDICATED WAT A POSSISLE CAUSE OF FAILURE P%Y HAVE BEEtl DUE TO EITHER EXCESSIVE HEAT OR CHEt11 CAL ATI ACK. FRESE!HLY, DIS 0 GRIN Cot?NU, THE SEALS SUPPLIER, IS RUl;NING A SERIES OF TESTS HEATING SEALS IttERSED IN THE RADIATION-RESISTNIT HYDRAULIC FLUID TO VARICUS 1T.MPERATURES NID OBSERVlilG THE RATE OF DEGRADATION. THEIR PRELIMINARY RESULTS SH01 THAT NBIEffT E'lWELL TEf?EPATUPES lti CERTAIN AREAS ggg0F) APE HICH EN0UW TO CAUSE SEAL DtMAGE OVER EXTEf!DED PERIODS OF T!VE. Il0 LEVER, THE BULK OF BE SNUBBERS ARE NOT SUBJECT TO TEtt-PEPATURES Ill EXCESS OF 125 F N1D, mEREFORE, SHOULD NOT EXPERIENCE SEAL FAILWE. IO EXPLORE mis AREA FURTHER, WO WERfDCOUPLES WERE PLACED ON A SNUBBER (SEE FIGURd lil) ATTACHED TO THE l'hlN STEAti llt!E AT A PolflT JUST UPSTREN4 0F BE lhlN STEN 4 SAFETY VALVES'ON WE NORE HEADER. THIS SNWBER WAS CHOSEN BECAUSE IT E)HIBITED THE M%T SEVERE SEAL FAILURE. THE TEt?ERATWE OF THE SNUBBER ACCUMULATOR AT RATED REACTOR PRES- ) SURE, TEMPERATURE, NJD STEN 4 FLOW MAS 13g0F WHICH IS Wi mlf! B E WORK!!G l 1 PAGE7
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) t IV. A'lALYSIS - CDtRINUED lT SHOULD BE PO! FRED OUT THAT 'THE tEASURED TEWER-RNIGE OF THE SEALS. ATURE IS A " SKIN" TB1FERATURE N1D IT IS'CONCEIVASLE THAT THE IfRERflAL TEMPERATURE IS HIGiER. IHIS IS POSSIBLE DJE TO SMALL AMPLITUQE VIBRATIONS BEING C0fNERTED llR0 HEAT BECAUSE OF FLlJID FRICTIOf! Off THE POPPETS AtlD SEATS. THE DA%GING EFFECTS OF RADIAT!0tl HAS BEEft RULED OUT SINCE BOTH THE SEALS No 115tl HYDRAULIC FLUID ARE HIGiLY RADIATION RESISTRU. IT HAS BEEN SUGGESTED THAT PERHAPS WE SituBBERS HAD BEB1 STORED OUTSIDE DURING THE CONSTRUCTIGl 0F EE PLAfTT NO THIS IS THE PEJ6ON FOR THEIR FAILURE. - THis WOULD WEtl EXPLAIN HOW SNO DIRT NO GRIT BITERED THE ACCU 1ULATOR. H0/EVERs WE HAVE BEEN ASSURED BY HAROLD ERICKSON OF BERGet PATEPSON THAT THIS WAS fl0T THE CASE. HE STATED W AT HE SUPERVISED WE INSTALL 1sTION OF THE SNU3EERS ORIGitlALLY AfD P.\\lfffAINS THEY llERE STORED INDOORS AT THE SITE FOR ONLY A VERY SHORT PERIOD OF Tlf E PRIOR TO INSTALLA-l T10fl. l A FlflALIZED REPORT FROM flex HANNA IS EXPECTED WHICH WILL DETAIL WE RESULTS OF THEIR IINESTIGAT10ft AS TO ildY 1HE UNITS FAILED AS WEY DID AfD THEIR REC 0f1ENDAT10N TO ASSURE THIS WILL NOT HAPPEN AGAIN IN THE FUTURE. I l p. PAGE8
O i V SAFUY SICilIFICKlE THE SAFETY SIGfilFICNICE OF EE SilUBBER FAILURES IS QUITE PROFOUID SINCE, IN THE EVEfff 0F AN EAREQUAKE, NO CREDIT COULD BE TAKEf) FOR THE SEISMIC RESTRAlfilflG ASILITf 0F THE UNITS. THECONSEQUENCESOFLOOSING' THIS ABILITY IAY G1fMY fl0T PRESEtiT A C0fOlTI0fl WriEREBY THE PROTECTED COPQlEfffS WILL FAILJ EIS IS SOLELY DEPEf0S(T UPON THE SPECTRAL EfERGY OF DIE EARDiOUAKE. THE DYtMMIC LOADitlG CAUSED BY BE EARTHOUAKE, Ill ITSELF. DOES NOT CAUSE APPREC1/SLE STRESSES Ill THE PROTECTED SYSTEMS UtlLESS THE FRE-QUENCY OF THE E/RTHOU/KE RESULTS IN REsof! ANT VIBRATION. IN Dils EVEffrs THE FAILUPI PROBABILITY IS VERY GREAT SINCE THE INilAMIC LOAD!flG IS NPL1-FIED QUITE sigil!FICN(TLY. THE FUilCT!0fl 0F WE SilUBBER IS TO IflCREASE THE RESONNIT FPIQUENCY OF THE SYSTEM TO A P0liff WriERE IT IS UitLIKELY ViAT AN EARTHQUAKE WILL CCri-TAlti VIBRATIOilAL EllERGY IN THIS FREQUEtiCY RN1GE. THIS IS ACC0fPLISHED l BY ADDING SfluBBER RESTRAltlTS AT P0lfffS IN die PIPING SYSTEf1 W11ERE THE RESOfMffT NPLITUDE IS A f%XIMUM FOR THE FIRST SIX iTDES OF RES0fMf(T VIB-RATION. Ifl THE FlfML ANALYSIS IT CN1 ONLY BE CONCLUDED DMT THE PROB /BILITY OF A COff0NEi(T OR SYSTEM FAILURE WAS INCPIASED UNDER DESIGil BASES EARTH-QUAKE C0'lDITIONS. 1 PAGE9
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se :* L t 4' 16,A. l 2. m:r f a ce flaice s where spccifico: a. Gland ID d. Valve borcs & cc sts 3 I b. .n., - s-
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c.. O-Ring grooves
- f. Head bore and rice with ports
) i / 3. Nicks or cutc on all seals, &' check fully to detail dw:7 t 1 4. Deburring of all.cartc cr.eecially E interecction of t two holes and at th r e r.d. s. 5. Charafers cr.d cornce brcns. i 6. Chips, lint, dust, rust, dirt, etc. l 7. Flatness of nale pkg adapt r. U s e s ur f a c a pla. te 5. indice:c to within.000 T.I.R. on ncrrcw pt:t Of cdcoter. l t i '*.;..m~.~..'".*. A 8. 1 n c n, o c e,u t -. ".,."... o.. s "o." i n. t,.,....'-) "c..., e ~ co.... a-- t -s a 3. C...,....,..,1. 4 .s.J I t 1.. Tho?;ourjhly ClOIn 811 P3! tS iComOdiDte}y before BSECThly Or m*sh-B S S c:7.b l y i ". t r iC h l O
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- f r.r.y cican e d pt r ts c re no t a n s ert.ble d d.:: :.n s the sino work.orrici thev. *..ust be re-cleaned 1
4 1 durir.9 t.r.c n ext wor.n perica wne eney w il b e a s c c o.,ru, c. nno j sealed. 4
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~ b trichic.: ethc,r.c with prect.utio.ns lis te? c.i O'N ETD 3 ?. 0 5, i /,. F C.e...' s.".. Ir. t. ' ct.",..."..'., Us e tool. Co. T-635 9 and f i::ter e "o. T-3 3 9'J. I n r e.- t the sc tir? tool'into the valve body-(3-5G95) and cpply 400 to 450 psi :c -ho fixture cylinder, holding it for "., serends. F.e p e a t for e) opposite sico. (.c....
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APPRO'/E:. ' l REVISED i-lo -68 c d s. .fe . G.fy?. k C.N. NO. ' 3 R3 8 HANNA COMPANY A REX CH/slNEELT COf.'PANY i NO.
3822 vv 1 : g m...s~.
g.i y ; y, g, C -! -I.* _!. f_.* c af.fis.f'.'; I ,i....v.. & e Y. l(, .to-p-2 a c,. a.. r. c l' w' HANNA COMPAN'( A REX CHAlNBELT COMP /.NY NO. - 3822 RECO!*.!'.EUDED ENGINEERING .P.: w' ice STANDARD . TL. S o" Tn:..o. n' o". '._n.'.a" 's.';' a.. e c-q P ' c.e.~r t,.~. '. t v
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e'..". 7.', r.P. *.'. '.r. *. "w P..' c S *. * ' " I. ". Look careful'.y c:. ~. ae the order to cietermine whe t mountina, style end stroke is required. torque as indiceted on Sheet 10;., Assemble the piston to rod, and install grub pin. Pecn over crub pin using round nose punca wit.s. 0.,_,7 racius. 1 From this p'oint on pay close attention to the secti:ns en Preause::.bly Inspection and Parts Cleaning. The c/linder must bc just as clean as the valve and accu aulator. The bench, vines, too'.s, and hands must ha absolutely cletn. Torque the tic rods as i indicated en Sheet 10. When eemplete. l cpply 1.:nking tapo mer porte. Storc the cylinder uncer 3 in a clean place since eve.n the external dirt may cover 1'
- f. i t) *.*. ;
v. rc o ' ~ ', I' i ,8 i Assemble the accumulator with the same care as the cylincer. l Torque. tic rods to 100 i nch..po und s. InstLil an SAE p:,rt t i plug in the port and turn'in finger tight. Torque the protectcr j i Alcmite fitting to 125 inch-pounds and the Scciscrew to 5 0 inch-pound s. Store the accumulator in a clean place cnd cover. NOTE: CCAT SPRING UITP.!W MAPI;!4 31.: ER ENG STD 3018. Use epoxy ca.w.nt on tail rcd and Alcmita fittina. o. .e.t.r. ., n. a.- 3. D a'".~,', r. u" '~m. Ecftre removrq7 the tapac from the cv.linder, carefully cleen the surfcce around the p::ts. When fi lli:.g, use clean, filtered fluid as lists drcwing given on the order. listed on the acsembly c: p rts a Full the rod out to full extension. Fill both ends of the cylinder with por ts f acing upward. Till the Valve-!tnifold Assn.bly, install '/alve-manifold essembly with the 0-Rinc,s s.ue ified and torc.ua manifold bicck cap scrc*,.s to 125 inch.-pounds torcac. Do not torquo the manifo.ld connector fittin.s ct th i s t.:c.e. ~ Install trensparent filler tube with eno.- in center port of velvc, and fill half fu:1 with filcarec fluid. Using the' stroking rig, o0e the rod in and out an ir.ch or tuo until all eir is blcd cut. Pull the rod all the way out, adding oil as it is needed Rctcte the snebber 90 deg ees so that valvc pl'.q: are up. P.cmon t.hc filin t.:be and th e h i v h.nr c r o ur c.n r.o to tuc val;c. Pepp c:.t d connect
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.L4.s., s .t .w rod oli tho.wa.e. in. e -l -. SHEET _1 Or.- 10 t I- A P P n O Vi~ D I 6.8_ G, C. W. is s e.;F o_ n.<c. ca sseo i ..R C,/\\Sr D.._ i.c. .,u, .a C.N: No. HANNA COMPANY A REX CH AINDELT COMP ANY ) 3e22 NO. RECO:'.I::Dt'D P:GCrTCE STANDARD -- ENGINEERING t TITLE SNUCE SP. TsSSE.v2M (Scrgen Pipesupport) V e'. S S t a._ 10. N.... ~' ' set the accumula tor, h'ith the snucber still in the stroking r ig, the cap screws. Screw the (freshly loosely in place withouts;.E elbows loosely into the valve and accumulct.cr part-*. cleaned) Oith the Install the connecting tube assembly (freshly cleaned) Insert the cap screws co hold t? - compressien nuts hand tich'. torc.uing to 125 inch.counds. Tor c.ue t.h : accumulater in place, elbow nuts to 125 inch-bent tube comprcssion nute and the SAE this time to l pounds. Torque the manifold conncctor fitting et 125 inch-pounds. Apply rust preven:.ive con to red threads l y...
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.e. m....9.~9 ~ ' ' ' ' m e w ".: 11. .T' '1 a". '. s in the strcking rig with ecewaulator on ton. i... Mcep the snuccer j Pump filtered fluid into accumulator until tail red extenc'.s 5 ) abount one inch. f / Loosen biccder adjusting screw until fluid begins to leak out. Tichten biccder scr c.. Bleed until no r.'. ore air bubbles appear. With the stroking rig, compress snubber all the way, being l careful no*. to get sprayed by oil frc, vent hole. Tcst fcr Pull snubber out anj,auch back in thru f ull s tr oh :. Bleed tail red inte din;nsion she.n lock -up i:2 both directior.s. on draving. Pull r.nubber rod all the way ouc. l '<'. I ".. S m.. ". T ". Chcck ic?k.ge 'rith c blotter Ci<cn 3r.ubber in trichloroethane.
- 1 crc..2 c read:ngs e:
with unit en a clean pic:e of pegr. tail rod tro icctica are to be takcn cnd recorded on de ted Ln n
- t. e :011ov:. ng conc 1:was.
under (1) Twice dai) v, mornina and afternoon at op,roximatcly thc sarc.e t ima for three dryn. Should a i t.r 3e varietion epp;ri on all unita, it mny be due to a larce difference in the dai:. r in t.e z.nnient ter..p er a tur e, v:.nen.ro suca retn n; n .cnange and cy.te.d test onc n.cre day. 1sfter th. first 2' hcurr :..r ' S c r e. L... - shou:d r:ve in z.nd cut.ith tc~,verotice only. reading:, + ich cont irmo t o inerc;no :.hould b:: checked 2 '.. leakage in a t:u:..ula n 1 3.
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l G e.... e..t. _..?,1 y : n d p-i n t por s l. l o f f r o n t f i c a s. a rc.: c. t. ; n.p;. AIte-tb n operition brn Ue ' i e .r "r ..n t.. y t h c.
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i I cnre:02:9 a.:"eid C ,,..:, y .. e ca u ::. u,- 1. .s j ggyp3go /-/o-da cd 4. S e l,"*,..<.;'.'. 3- .,., b, chL G.N.' NO. HA i i ar.ra Co-t,msN.v r .. s ..irm /i RE;; CHA!NO7.LT COMP,'.NY \\. ~ oo,,. g p.g,), ~ : r'.E c 0 M t4 0 tLP E D p r. A e n t : S T A N.D. A R D ~ E. N C.3 I N r =._my,; r. TlTi E s N o E e E p. A S 5 E M OL'i' ( C W.G E14 PiM WN - =- ~ j,. cuforf s SWITCH ~ .r - 0 3 D 0 #- m c i 3. .w-> ~1 Ain, oFF i t , z .g,,,. u t .T ' ~ E' ,!.I'. 4, tis
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l .,j , @..-.---- d' yy T-w.-.. .- J s c.u*t t onormo [ w a1 (cw') l-n r3i .r t -Y..+9 .."'._.v. J, Q J, v c r:' 2 s g j p-? qc7c,') (o e t N') I cg w s-) v, <c te. f~l, ( r q a. u.s s .s l .o 3 I L.a i 'i i i r-1. 0 t-2 - - - u, . r L -. p y-M E A s u n.'2. FLOW P. M E W U j li t P.E 00 l( .d VALvc bj BCIN G otAss T E '!.5 C D / sp.AouATE '/ 50totsj e y. /% n t NOTE.- - W 5 'G -7 Ci' 8 A'^- U E C' D F CR 6 " 0F V" 'T o p c ia. V A Lv E B E i n G - i' E /T E D. SEE CH E ET -M & P c R F L o vJ R A E.'. f r o ',i...... ~ ' 4' .) .,,e, .,,3... r- ....os, t u. +.... t: .,. e n
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G.e... h,. ..e... = ~ ' cd aI. P '.'. -:. )...'. :! 1. '..? ~ ' ggy:suo t-to-ne E 'r f 5 'i. '?:..'" I. '. ' ' j 3836 G.N. NO. m HANNA COMPANY ~ A RE'A CHA.!NSILT COMPANY [ I Qo, SS22 r.c c o M M e tt D E D ENGINEER!NG P r. A M i c t _ _ ST A N D_A,R D ~ TITLE S N U E B E 9. A S S E M BL.Y ( O ER G Et4 P l p E SU PP O RT m -- CUT-O f f 5 W i *r C H ~~ T-8390[ ~~3.
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SEE CHEET-M 9 FOR F L O UJ R AT C. .e 3 s. ..**;s +... .,.......~..:..s. . 'o,:, ,...,y..,, .s ..l,,. r. C,,,. e. n. _ ..e.,< w. u., (. l .iw ._. L.. :,. -~ .. ~ - _. =,.- !-2-GS,. 4 .,, 1 1e c UeD - ),1..,, - MPPROVCD a -nggwco i.io se en)e.o r ~.. O f y' - j 3m c,s, no, A, =a HANNA COMPANY c A REX CHAIN 6ELT COMPAN. Y ..NO. 3S22
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b. s e c o emoto c EN G.IN E E R I N G P A. A CT I C E STANDAflO m-p. TITLE SNOBBER A S S E M S t.Y. ( S E R G E N ; P I PE SU PPO P,T) j i.e350 c u r. o pe T-8 3 9 0 %~ ~ swiTc H . i ~ + t=> \\ \\ .;4 /.i . l a L vat.VE B EulG ,t , s en.c c o s g*:o 2 0 P. S t. p51
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s.r a 47 [,'.y.'.,, ['.). 1 . NO, 3822. I. $f + d..g;..:r. ~ RECOMMENDED 3 E_N G !N E E R IN.G. - PR A CTICE STANDARD = af..@.. TITLE SNu seE R A.S S EM E LY (EERGEN P t PE SV PPORT)- .g., g
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BEIN G 'I* e / u l-TESTED l - P L A S Ti c G R A D U AT E . s- .(500 ML C A *> ' Y ) .u ) g.a. NOTE OPEN V ALV E M 5-G-7 ORB AS R E Q'O FOR SIZE OF UNIT G E IN G T E E T E' D. SEE St4 E ET,# 9 FOR F L O W 'R ATE. . 's ' (-
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s .I \\ j i ,f I. 3 - 3 m.. o.t5. '._.//l ' q. N. E P..T _7 ossuEo s -o w . nc ~ " ,. 6 g ' g' g' 4 REVISED /- M - 4.8 C 'l C. # . [' ' I *',',. ~, ~ ..,.,".. i.. H g 7' .b. '. I ! H A N N A.'.- ,.C.N. N O. 3638 COMPANY e' . :__ ? /__.: . '.O .. 'r.'.U... * . A REX CHA! NEE.LT COMPANY l .t.. 4.
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' RE coMM E tt DEO =._ -- NDAr(O - STA P P. A C T I C E E N G I F.u :.P P:I N_G TITLE SNUBBER A S S E M G LY (GERGEN P l P'E S U P P O P.T')... _ - ', % f 'j ' 4.-. .C ' 'c.V.,. o' ~..,. . P.oD ' E'w T E N 51014 7-6389 I, / .i. .n ,.. r~;, ;.O W t T. C H ~. c. T - 8 3 9 o,,, i 3--
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POPPET G ROCVIN G F R*? S SURE.T O B E DET U P,M ) tl ED E Y T Ri tsl. (, ' A P P R.s....' .a ) U S E 'V M '.' 5 5 A 5 I N D I C AT E O. 6 1.brlOU LD L E L ET, W IT d 3 4 N't D E OPEt4,TC GIV E P. S t. D H UT V A LV E ?. 4 A N D P LA CE. Po ? P ET I N DtE. CF.ACK ' V A L V L.:.*+ 70 O B T A I N E. Y A CT L'- P S I 0 6.:. G A G T. H C L O 5 SECON DS S H OT O F' P PUM P AND OPEtd V ALVE F4 REHoVE PO PPET Fi'ota ot E.;;,' CLOSE vALUE W "C N CCK Flow R ATE 'OF POPPET P EE. S H E ET NO. 5 U: P O P P E.T DOEL N O T P A 15 E t;G V G H Cll, T P.'t' t ". A r t v1 G N E.xT P C P T-E.T AT LLIGHTW H I G H E.U. P. L.t. Cth9 P P. 0 F C P P R E S !,V I4 'd E.Y THIS METHOD /ND o R..' O V E R E t *i/ 1 H t N G GL At'K 5.
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i i i T,t s l'.E7 T E P, T O t4 A t' E p o p p D' S AT JULT SLt GHTLY U N D E R. T;-l '? ci t4 A L ' A F.P.t VE D AT ' PR t 0_U C 7 AS THE Y C A N !*.E C.C~v.'O Cl E O 15-i tCY
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..v i. g g ut:E.c. s _6 s.>. / Q I APPROVED g - ISSUED f G &__ ; ', } G.f K. RENISED /-'*d a ca wo I C.N. NO. 363.0 HANNA COMPANY 9 A'T:EX CHAIN, BELT COMPANY NO. 3822 ENGIN(ERIN G P rt.o c c cu rd. STAN D A dD TITL.E st /riw. se/sig. e'o p0Pp=T APP R M OFEN SE AT E D POPPET - w.,u =.. pencT popecy s a t Ecw too O f L. NO. G P,0 09 \\ g g ptew ptow TYPE R PRES 5URE ( A=P P.,2 P50 ( 2 0' P S t ) DMG.NO.-l E 650 To 900 10.8 TO 16.3 l D - t 7 59 'c G M(L 2 V.! l t'b : 2 H 5Gc6 3 g, i,ogofj,g 3 g ig,4 70 g7,3 l o. 27 5 S + GL l D co/2,4 7 0 27,S To 41. I' O-27 594 J 21 t i l ________.____=L 2 '/n l 3-? 7 504 t. ' 37.0 Fst GEOToE'C0!'0.870 V'IjD-?'59'-Gl (3 g ieo 060/(6 o h6.+ Yo 17.El D -17 50 ' C. [ 3 '/4 ! o - 27594 p l 5i: 06-50 1,900/2,470l27.8 To 41.1! D-275S 4 J ! 4-. D-275.'4 Ml 2OO g GOO 2,ICO/.E,500l 3 S To 5 7 D ~3 0 7 ElO 6 __ j D 'S O 7 8 7 i 1 I i -m.___ GE a %. o - 215 94 5 i I G O Psi h5o To eco ilo.B To IG.310 - ? 15 M G l i S F t O 17 3%. D-27 59 4 U l 20O l l'0 80/f, s so I B. ~- To 2.7.?. I D - 2 7 5 9 4 Q_ i 4-0-29 9 08 A !
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Q,* HANNA COMPANY 3 A REX CHAlNBELT COMPANY NO..- 3822 ENGir4EERING nKgpMuBNpso
- NCnce, STAND %RD TITLE TOROUES FOR 3ERGEN PIPE SUPPORT UNITS All torques are inch pounds unless otherwise specified ACCUULATOR
_2.50 B. ORE _3'.25 BORE 4.00 SORE' TIE RODS 100 1:4LS 100 l >bt.s 100 14 3 PROTECTIVE TUBE NUT 216 216 216 PISTOtt ROD EPOXY EPOXY EPO7v MOUNTI6G SCREWG 125 125 125 ALEMITE FITTING' .125 125 125 1 .25 TUBE FITTING 125 125 125 I SEELSCREW 50 50 50 CHECK VALVE. PORT PLUGS } 96 96 96 -RELIEF VALVE SEAT 216 216 216 i MANIFOLD COMNECTOR 216 216' '216 I I MANIFOLD TUDE CONNECTOR 216 216 216 NANIFOLD SCREU 125 125 125 p .50 TURE FITTING 125 125 125 CYLINDER TIE RODS 48 FT-LDS 84 FT LBS 110 FT LBS PISTON ROD 200 FT-LBS 250 FT LDS 300 FP-LBS 10 _ 10 . c a... r,, ... s.. -. O- - _ = _ - - i 'I "i %.d h i 'I Jerwy Cent.rul Powulf & Light Conipany-
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,,,r h_, ll* M ADIScN AVENU E AT PUNCH DoWL R "., A D 9 Mo R RIS town. N. J. 07960 e $ 39 6111 August 3, 1973
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l Mr. A. Giambusso r Deputy Director for Reactor Projects g% /p ] Directorate of Licensing q, V United. States Atomic Energy Commission ru i h'ashington, D. C. 20545 / I 1
Dear Mr. Giambusso:
Subject:
Oyster Creek Station Docket No. 50-219 Main Steam Isolation Valve lhe purpose of this letter is to report a surveillanco closure of nnin <tcam innistjem u.,1ve unap, nr !c e, tbnn 3 tr. e+ rM : mrt in ecn:U-cred to t,c an abnormal occurrenco as defined in the Technical Specifications, Paregraph 1.15.A. E ti. ation of this event at requi. red by the Technical Specifications, Paragraph 6.6.2.a., was made to AEC Region I, Directorate of Regulatory Operations on Wednesday, July 25, 1973. Prior to a plant startup, full closure timing and scram checks warc .boing cor. ducted on all four main steam isolation valves. In testing valve NSO4B, the closure time was measured to be 2.6 seconds; wharcas, the Technical Specifications miniuum limit in Paragraph 5.6.1.2 is 3 seconds. Two additional timing checks were conducted, both of which indicated the valve to be closing faster than the stated limit. The hydraulic dashpot associated with the velve operator was found to contain insufficient oil. Approximately four quarts of oil were added, whereupon satisf actory closure times were obtaineJ., hhile straking the valve, oil was detected leaking alone, the operating shaft at the seal eartridge assenbly. This apparently was the cause for the loss of oil. Pertiner.t component data is as follows: Seal Manufacturer: !!ydrod,ine Manufactt. ring Co:npany j Seal Carcridge Asseichly: N661-20-V t
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t. s , Mr. Giambusso August 3, 1973 The seal cartridge assembly was replaced, adequate oi.' was added to the hydraulic cylinder, valve tircing adjusted, and the main steam isolation valve returned to service. The remaining three main stemn isolation valves were inspected to oil leakage, dashpot oil levels checked, and all found to be satisfactory. The minimum valve closure time limit of 3 seconds is based upon limit-ing the vessel peak pressure during the isolatica valve closure transient analysis such that the main steam safety valves do not lift. Since the closure times for the other valves were normal, the effect of the pressurization transient due to fast closure of NSO4B would probably have been minimal had an isolation tran-sient occurred while the plant was at power. In this particular instance, th plant was shut down and the reactor water temperature was below 212 F. This particular seal maintenance is not considered to be unusual and hence no further surveillance requirements will be imposed. The plant will continue to time the valves in the prescribed manner and take whatever main-tenance action is appropriate to satisfy the timing requirecents. Enclosed arc forty (40) copics of this report. Very truly yours, .) i; f,, s., f Donald A. Ross t Manager, Nuclear Generating Stations DAR:cs linclosures cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region I 4 1 4 ) l l l l 1}}