ML20084J231
| ML20084J231 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 08/06/1973 |
| From: | JERSEY CENTRAL POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20084J225 | List: |
| References | |
| NUDOCS 8305120261 | |
| Download: ML20084J231 (32) | |
Text
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SLRlARY EPORT ON SilBBER EPAIR ACTIVITIES DURIi1G SPRING 1973 ERELING OUTKE PEPAED BY: ARilluR If' RIE f r,.. - RBIST 6; 1973 f.1;. fg;. ,,.;77,Q O n INE 0 AoPRNAL STATION SUPERINTETEElT l00*IEEI'o$8888t, - PDR _ _-__-__-______-____a
O- O l l TABLE OF C0fGENTS
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I. IfRRODUCTI Q4 . , , . . . , , . . , , , , , , , , , PAGE 1
- 11. EQUIPMENT DESCRIPTIQ1 [...........l PiGE2 III. ORGANIZATIQ10F IhltTTENANCE ACTIVITIES , . . . . PGE4I IV. A4ALYS I S . . . . . . . . . . . . . . . . . . . . PAGE7
. t V, SAFE 1Y SIGNIFICANCE .............. PAGE9
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FIGURE I . . . . . . . . . . . . . . . . . . . Pi~GE10 FIGuReII . . . . ,,.....l..,..l. PAGE11 FIGURE III . . . . . . . . . . . . . . . . . . . PiGE32 TABLE I . . . . . . . . . . . . l .'. , ,
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. I. IfffFDIXJCTION AS PART OF THE IN-SERVICE IriSPECTIQ1 PROGRAM FOR THE APRIL 1973 !
REFUELING OUTAGE, #1 INSPECTIQ10F THE DRWELL FWDRAULIC SH0CK AND SWAY ARRESTORS (HSSA) WAS CGOUCTED. THIS INSPECTIO!1 REVEALED BAT A MAJORITY OF EE LIllTS WERE TOTALLY DEVOID OF FLUID WHICH, CONSEQJENTLY, RESULTED IN THEIR INOPERABILITY. ImEDIATE STEPS WERE TAKEN TO CaiTACT THE SiluBBER SUPPLIER, BERGEN PATERSON PIPE SUPPORT COMPNN, WHO RECOM-
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TENDED THAT A REPRESEffrATIVE SAtPLING OF BE StAEBERS IN THE DRYWELL BE SEilT TO THEIR SHOPS FOR Ml/ LYSIS. 01 MAY 5,1973, BREE 6) SNUBBERS WERE REMOVED FR04 WE DRYWELL
#4D SHIPPED TO EE REX HNRIA CGPNN, WE SNWBER tW1UFACTUPERS FOR BERGENPATERSON. THE SNUBBERS, WHIOi HAD BEEN LOCATED OtE ON EAOi l'hlN STEAM LItlE N1D ONE ON THE ELECTRGiATIC RELIEF VALVE DISCHARGE PIPING, WERE CGPLETELY DIStWITLED NID INSPECTED. IT WAS REPORTED TO JERSEY CEtl-TRAL paver AND LIGar C0ffMN THAT BE TWO SNUBBERS LOCATED G1 THE MAIN STEAM LINES WERE IN A VERY DETERIORATED CONDITION REQUIRIllG COPLETE RE-BUILDING. THE EIRD SNUBBER WAS FOUND TO BE IN SATISFACTORY CQ4DITION REQUIRING ONLY HYDRAULIC FLUID ADDITION, WHIOi IS CONSIDERED NORMAL MAIN-TEtMNCE. IT SH0JLD BE STATED THAT THE TWO FAILED LtlITS WERE IN SERVICE LQ1GER thall WE WIRD WHICH WAS INSTALLED DURING THE 1972 REFUELING OUTAGE.
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AS A RESULT OF THIS INVESTIGATIG1, It4EDIATE STEPS WERE TAKEll TO REMOVE AND REBUILD ALL StiUBBERS IN THE DRYWELL NC THOSE SNUBBERS IN THE
% ACTOR BUILDING ASSOCIATED WIE SAFEGUARD EQUIPt1Effr.
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. II. EQUIREff ESCRIFil0N THE HYDRNJLIC SH0CK NID SWAY ARRESTOR (HSSA) UNIT (ILLUSTRATED If1 FIGJRE ONE) IS USED TO PROTECT PIP!flG SYSTEMS NO EQUIPfENT PIECES stb-JECT TO POSSIBE DAWE FROM SHOCKS OR VIBRATIQl. IN EFFECT, THE ARRESTOR BECGES A RIGID STRUCTiEAL MEFEER UNDER IMPACTIVE LCADING C0ft-DITI0flS. IN DOING THIS IT IS CAPABLE OF TRNISFERRIflG LOADS FROM THE PIPING OR EQUIPbEflT PROTECTED TO RIGID STRUCTURAL fGEERS. THEARRESTOR A.
IS FURTHER DESIGlED TO ACC0f fiODATE NORf%L mERMAL f0VEFEfff 0F THE EQUIP-MENT PROTECTED WIE A MIft!f0M OF RESISTNICE. THE UNIT CQlSISTS OF A DOUBE ACTIflG PISTON CYLINDER ARRN1GE?EfE,
#1 EXTERNAL VALVE BLOCK NO A SPRING LOADED ACCUMULATOR ASSEfBLY GEE FIGUREII).
DJRING OPERATION, THE PIST0ft IS FREE To f0VE UllRESTRICTED IN EITHER DIRECTION WIE THE POPPET VALVES REMAINING FULLY OPEN FOR ALL PISTON VELOCITIES UP TO 10 IN W ES PER MINUTE. THIS VELOCITY IS GREATER EN1 #1Y OPERATIONAL THERMAL GR0ml AND ESS THAN THE VELOCITY OF ANY NORMALLY ANTICIPATED DISTURB!fl0 FORCE. BOTH THE COMPRESSION AND TEflSIQ1 C0ffTROL-LING POPPET VALVES ARE DESIGilED #1D SET FOR Cl.0SURE WHEN 1HE PISTON VEL-OCITY EXCEEDS 10 INWES PER MINtRE. WITH WE POPPET VALVES CLOSED, THE FLUID FLQi IS ESSEffTIALLY STOPPED, THEREBY TRANSFORMING THE UNIT INTG A RIGID STRUCTURE (NOT ABSOLUTELY TRUE, DUE TO WE COFPRESSIBILITY OF THE SILICON FLUIDJ I.E., 3000 PSI WILL C04 PRESS FLUID TO PERMIT 20 MILS OF PISTONTRAVEL). CLOSURE IS DESIGNED TO BE EFFECTED WITHIN 1/32-INm 0F PISTG1 ROD TRAVEL. I PAGE2 ;
^ ;. O O II. EculPrefn DESCRIPTIQ1 - CONTINUED THE SPRING LOA'DED ACCU 4JLATOR SERVES AS #1 OIL RESERVOIR TO MKE UP FOR St%LL EXPECTED LEAKS. IN ADDITION, IT SERVES TO KEEP THE HYDRAU-LIC FLUID ulDER PRESSURE, THEREBY ALLOWil1G EE ilSSA TO BE MOL TED IN A VARIETY OF POSITIQ1S WITH0lK THE HYDRAULIC FLUID DRAINING OUT OF THE CYLINDER.
THE HYDRAULIC FLUID USED IN THE StilEBERS IS OF TWO TYPESj OE WHICH IS HIGiLY RADIATIQ1 RESISTNIT FOR USE IN THE DRYWELL, THE OTHER tJ,0N-RADIA-TION RESISTNIT FOR USE IN THE BALANCE OF THE PLAtlT. THETWOFLUIDSARE, ESPECTIVELY, G.E.S.F.1154 NHIOi IS tEEYL PHEllYL SILIC0fE, AND G.E.S' F'.'- c6(50) WHICH IS DItEEYL POLYSILOXAfE SILICQlE. SILICONE BASE FLUIDS ARE USED BECAUSE THEY ARE NON-FLAf4MBLE, NON-CORROSIVE, CHEMICALLY IfERT MlD RELATIVELY STABLE OVER A WIDE TEMPERATURE RANGE. NORMAL NBIENT TEffERA-TURE RN1GE FOR C0flTItlUOUS OPERATION IS FROM MINUS E T TO I PLUS OO T.' ALL THE SEALS USED IN THE SNUBBERS ARE t%DE FROM DJPONT ADIPEE l-167 WHICH IS A POLYURETHANE ELASTOER t%DE FROM TOLUNE DIISOCYANATE POLYETHER LIQUID PREPOLYFER. TESTS VE'tIFY
. THAT THE SEALS ARE GOOD EVEN AFTER EXPOSURE TO RADIATION 8
IN EXCESS OF 1X10 ROEffTGENS. THE TEtPERATURE CHARACTERISTICS OF THE SE LS ARE IN bUESTION AT THIS TIME. ACCORDING TO BERGEN PATERSON THE POLYURETHANE SEAb5 ARE SU' TABLE FORCQlTIt1U00SOPERATINGTEMPERATURESOF150TANDARECAPABLEOFOPERATING AT TEFFERATURES UP TO 200CF FOR " SUSTAINED PERIODS WITH0lK IFPAIRf@ir 0F FUNCTION." IHE SEALS SUPPLIER ON THE OTHERHNID SAY THAT 150T SHOULD BE CONSIDERED THE MAXIt4JM OPERATING TEMPERATURE FOR THE SEALS AND 1 HAT OPERA-TION AT 2009 WILL CAUSE SEAL FAILURE. l l PAz 3
O- O i III. ORGAIIZATIQi 0F f%IRIEIA1E ACTIVITIES A. ((D/AL A'lD REI!lSTAllATIGh BECAUSE OF die HIGi RADIATION LIVELS PRESENT THROUGiolK THE DRWELL, IT WAS NECESSARY TO ORGN11ZE die REFDVAL ACTIVITIES SU0i THAT THE TIfE EXPEf1DED PER St1UBBER REMOVED WOULD BE A MINIful. IT WAS DiOUGHT THAT THIS COULD BEST BE ACC0iPLISHED BY DIVIDIf1G THE DRWELL ITE0 VOLiliES NID REMOVIrlG THE SituBBERS til TrilS BASIS. THE SNUBBERS ret 10VED FROM EiE VOL-UN COULD THEtt BE REBUILT #1D MADE READY FOR REINSTALLATIG1 IN A 'BATOi. THIS WOJLD THEtt ASSURE THAT THE SiluBBERS COULD BE TAKEN, WITH0llT CONFUSI0tl, TO THE AREA 0F THEIR REll1STALLATIG1. TO FURECR FACILITATE Tile REINSTALLA-TIQ1, LARGE IDENTIFICATIGl NutBERS WERE CLEARLY t%RKED 01 THE SNUBBER NO M0ltfriflG PLATE WHIOi ALLGlED THE WORKERS TO QUICKLY MATOi die SNUBBER TO ITS ASSOCIATED fDLI1 TING PLATE. 1 B. f%IifiEiA1E ACTIVITIES: TIE REBUILDItlG AREA WAS LOCATED ON 95' ELEVATIG1 IN THE REACTCR BUILD-ING NO WAS DIVIDED ItiTO DIREE WORK STATIO1S, THERE WAS A DISt%tiTLIflG NO l CLEN11NG STATION, A REBUILDIf1G STATION, NJD A UNIT QUALIFICATION STATI0tl. 1 THE FOLLOWING IS A DESCRIPTIQ10F die ACTIVITIES PERFORMED AT EA01 STATIGl.
- 1. DIStWITLING #1D CLEMIING STATIGl TliE PURPOSE OF THIS STATION WAS TO REfDVE #1Y CQiTAMItlANTS NID RESIDUE FR04 DIE SNUBBER ASSEfBLIES, BOTH EXTERNALLY NiD IrlTEPJ1 ALLY. Ifl ADDITIG1, IT WAS CGiVENIENT AT THIS TIE TO INSPECT MO RECORD THE AS FOUND C01DITIQI 0F THE SNU3BERS. AFTER DISASSEtBLY, TliE StiUBBER PARTS WERE GIVEN FIRST A DIRTY DiEN CLEAN WASHING IN 311-TRICHLOR0 ETHANE 01-50) SOLVENT. I THIS PARTICULAR SOLVEffT WAS CHOSEN BECAUSE IT LEAVES NO RESIDUE AND IS NCti-PAGE4
~ ~ ~ ; 111. QtG411ZATIQ10F l'hlfEEllNICE ACTIVITES - C0fElflUED T0XIC.
IT WAS ALSO REQUIRED TO SCRAPE MS/0R WIRE BRUSH EE REMAlt0ER OF THE SEALS OFF OF TiiEIR SEATS IN PREPARATIQ1 FOR REASSEFBLY.s Iflt%fN , CASES, IT WAS ALSO REQUIRED TO PRESS QK THE BRASS BUSHillG AND WIPER RING IN THE OlRBOARD BEARING BECAUSE OF IllITIAL MISALIG*1MEffT BETWEEtt THE PISTal ROD #4D BEAR!flG HOUSING. THE MIS /LIGNMENT CAUSED SCRAToi!NG OF THE CHR0fE-PLATED PIST0fl ROD NID WE SOFT BRASS BUSHIllG. ,
- 2. REBUILDING STATIQ1 !
IN ORDER TO ASSURE f%XIMUM RELIABILITY FOR THE REBUILT SfluBBERS, IT WAS DESIRABLE TO PERFORM THE REBUILDIflG OPERATI0flS UNDER EE CEANEST C0flDITIONS POSSIBLE. SINCE EE REBUILDING WAS PERFORTED UNDER FIELD C0ft-DITIQJS, EXTREME CARE HAD TO BE TAKEN TO KEEP DIRT, GRIT AND DEBRIS OUT OF THE REBUILDING AREA. THIS WAS ACCGPLISHED BY REQUIRIflG A DAILY CLEAti-4 UP OF THE REBUILDIllG AREA NO A DAILY CHANGING OF THE WHITE BLOTTER PAPER COVERING THE REBUILDIflG STATIQ1 TABLE. THE C E NILINESS CRITERIA WAS FUR-THER AIDED BY THE RADIATIQ4 PROTECTIQ1 REQUIREfEllTS WHICH REQUIRED COTT0tl AND PLASTIC GLOVES TO BE WORN BY INDIVIDUALS ITNOLVED IN THE REBUILDIllG ACTIVITIES (SEE ATTACHED DETAILED REBUILDING PROCEDURE).
- 3. & LIT QUALIFICATIQ1 STATIQ1 AFTER REBUILDING, BE UNITS WERE BROUGHT TO THE UNIT QUALIFICATION STATIQ1 WHERE THEY WERE FILLED WITH HYDPAULIC FLUID NO OPERATIONALLY TESTED.
THIS WAS ACCOMPLISHED BY FORCING FLUID IIIDER PRESSURE THROUGi AN ALEMITE FITTING Ilff0 THE ACGJ4ULATOR CAVITY WHIOi IN TURN FLOlED ItiTO B E f%IN CYLIfDER. IHE IIIIT WAS THEN " STROKED" USING A PNEUf% TIC DEVICE l PAGE5
; O O Ill. ORGANIZATIG10F Ih!NTENAfCE ACTIVITIES - 00ffrINUED t
TO ASSURE WiAT NN TRAPPED AIR WAS FORCED Iffr0 die ACCUfULATOR WHICH COULD DiEN BE BlID OUT DIROUGH die FILL PLUG. AFTER IT WAS ASSLRED THROUGi A REPEATED FILLING AlO BLEEDING PROCEDURE THAT THE UNI,T WAS PRO-PERLY FILLED, IT WAS AGAIN STR0XED, AT 10 INOiES PER MIfMTE, TO VERIFY THAT BODi THE TEfSION N1D C0iPRESSION VALVES ACTUATEDPROPERLY, DiEREBY TRANSFORf t!!1G THE UtilT Iffr0 A RIGID STRUCTURE. t FINAU.Y,WiEUNITSWERETRNJSFERREDTOATEMPCRARYSTORAGEAREA NiERE THEY WERE PLACED ON CLEN1 BLUTTER PAPER FOR A 214 HOW PEPIOD. AT THE END OF THIS PERIOD, IF THERE WAS !O EVIDEfJCE OF OIL SPOTTING ON THE BLOTTER PAPER, THE UNITS WERE TRNISFERRED TO DiEIR AREA 0F REINSTALLA-TIC li. IF SPO! TING CCCCRED, BiEY WEPE CICCKED FOR LEAKS #D REPAIRED ACCORDIf1 GLY. A TOTAL OF 9 UNITS WERE REJECTED ON VilS BASIS, 8 0F Wd!Oi WERE REPAIRED. THE OTHER UtilT, IT WAS DISCOVERED, HAD A SMALL CRACK IN THE f%IN CYLIllDER NiD WAS REPLACED IN TOTAL BY A NEW IIIIT. )'
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- IV. #1ALYSIS
. TABE OllE LISTS THOSE SNUBBERS REPAIRED AND TABULATES THE IllDIVI-DUAL COMPONDITS REPLACED. Ifl ALL' CASES, THE St,"JBBERS WERE MADE IN0PER-ABLE DUE TO A LACK OF HYDRAULIC FLUID. THOSE St1UBSERS LOCATED WIT 1JIN B E DRYWELL SH0 LED SEVERE SEAL DETERIORATION TO BE POINT OF BEING IflCAPABLE OF RETAINIf4G HYDRAULIC FLUID EVEN FOR A SHORT TIE. ITISt10TFULLYKt0NN, i AS YET, ElmER THE CAUSE OF SEAL FAILURE OR EE ENGTH OF TIME IT TOOK FOR BE FAILURES TO OCCUR. IT IS FURTHER fl0T tK1DERSTOCD WHY THERE APPEARED TO BE SNID, GRIT, DIRT AND WATER IN THE ACCUMULATOR, OR WHY MANY OF BE ACCLNULATOR SPRIllGS WERE 1 i BROKEft. INSPECTION OF THE SEALS ItJDICATED THAT A POSSIBLE CAUSE OF FAILURE MAY HAVE BEEtt DUE TO EITHER EXCESSIVE HEAT OR CHEMICAL ATTACK. PRESBITLY, DIS 0GRItt CofrNu, mE SEALS SUPPLIER, IS RUNNING A SERIES OF TESTS HEATING s SEALS IfVERSED IN THE RADIATION-RESISTANT HYDRAULIC FLUID TO VARIOUS ' 1 TEWERATURES NO CBSERVil1G THE RATE OF DEGRADATION. THEIR PRELIMINARY RESULTS SH01 THAT N.BIEf6 IRYWELL TEffERATURES IN CERTAIN AREAS (1650F) ARE HIGi Ef0VGi TO CAUSE SEAL DMAGE OVER' EXTENDED PERIODS'0F TIE. II0 LEVER, EE BULK OF EE SNUBBERS ARE NOT SUBJECT TO TEft-PERATURES IN EXCESS ~0F N AND, THEREFORE, SHOULD fl0T EXPERIENCE SEAL FAILWE. IO EXPLORE-THIS AREA FURTHER, WO THERf0 COUPLES WERE PLACED ON ASNUBBER(SEEFIGUR5III)ATTACHEDTOTHEPAINSTEAMLINEATAP0lliTJUST UPSTREAM OF BE IiAIN STEM SAFETY VALVES ON WE NORE HEADER. . } THIS SNWBER WAS CHOSEN BECAUSE IT EMilBITED THE MOST SEVERE SEAL .
- FAILURE. THE.TEffERATWE OF BE SNUBBER ACCUMULATOR AT RATED REACTOR PRES-0 SURE, TEMPERATURE, #4D STEAM FLui WAS 139 F, WHICH IS WIBIN WE WORKING PAGE7
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'. IV. ANALYSIS - Q)flTINUED RNIGE OF THE SEALS. IT SHOULD BE POINTED OUT WAT WE tiEASURED TEti)ER-ATURE IS A " skill" TEMFERATURE NJD IT IS C0'lCEIVABLE WAT WE IrlTERIML TEMPERATURE IS HIGHER. THIS IS POSSIBLE DUE TO StiALL AMPLITUDE VIBRATI0tlS BEING C0tNERTED IliTO HEAT BECAUSE OF FLUID FRICTIO!! O!! THE POPPETS NID SEATS.
THE DN' AGING EFFECTS OF RADIATI0tl HAS BEEN RULED OUT SINCE BOW THE SEALS NO 115tl HYDRAULIC FLUID ARE HIGHLY RADIATION RESISTATr. ITHASBEEftSUGGESTEDTHATPERHAPSTHEStaJBBERSHADBEENSTORED OUTSIDE DURIr1G THE CONSTRUCTI0il 0F THE PLAffT AND WIS IS THE REASON FOR WEIR FAILURE. IHIS WOULD WEN EXPLAlti HOW SND DIRT Af1D GRIT ENTERED WE ACCirlill ATm, HRIEVER, WF HAVE BEEtt ASSURED BY HAROLD ERICKSON OF BERGEN PATERSON WAT WIS WAS fiOT THE CASE. HE STATED W AT HE SUPERVISED THE INSTALLATION OF THE SfluBBERS ORIGIt! ALLY AfD MTIllTAINS THEY WERE STORED IND0 ORS AT THE SITE FOR OllLY A VERY SHORT PERIOD OF TIME PRIOR TO INSTALLA-T10tl. A FIIMLIZED REPORT FRai PEX HulfM IS EXPECTED WHICH WILL DETAIL THE RESULTS OF THEIR ITNESTIGATI0fl AS TO WHY THE UNITS FAILED AS THEY DID AfD THEIR RECGT1ENDAT10fl TO ASSURE THIS WILL NOT HAPPEN AGAIN IN THE FUWRE. PAGE 8
O O l V. SAFEIY SIGlIFICAlE . THE SAFEW SIGNIFICAfJCE OF THE SNUBBER FAILURES IS O'JITE PROFOUND SINCE, IN THE EVENT OF Aff EARm0UAKE, NO CREDIT COULD BE TAKEN FOR THE SEISMIC RESTRAlfilf1G ABILITY OF THE LNITS. THEC0f1SEQUENCESOFLOOSING THIS ABILITY M (_ OR fnY NOT PRESEffT A C0f1DITION h.1EREBY W E PROTECTED C0ff0NSITS Will FAILJ Wils IS SOLELY DEPENDEIT UPON WE SPECTRAL SERGY OF die EARE QUAKE. THE DYtMMIC LOADING CAUSED BY DIE EAREQUAKE, IN ITSELF. DOES NOT CAUSE APPRECIABE STRESSES Ill die PROTECTED SYSTBis UNLESS WE FRE-QUENCY OF THE EARTHQUAKE RESULTS If1 RES0fMf6 VIBRATION. IN THIS EVENT, THE FAILURE PROBABILITY IS VERY GREAT SINCE THE DVfMMIC LOADIf1G IS NiPLI-FIED QUITE SIGNIFICAllTLY. THE FUf1CTIOf10F BE SNUBBER IS TO INCREASE WE RESONAffT FREQUENCY OF THE SYSTEM TO A POINT hiiERE IT IS LtiLIKELY WAT N1 EARTHQUAKE WILL C0ff-TAIN VIBRATIONAL Ef1ERGY IN DilS FREQUENCY RANGE. THIS IS ACC0ffLISHED BY ADDIf1G SiluBBER RESTRAlfiTS AT POINTS IN die PIPING SYSTEM WHERE THE RES0fMffT AMPLITUDE IS A t'AXItui FOR EE FIRST SIX MJ)ES OF RESOfMNT VIB-RATION. IN THE FIfML ANALYSIS IT CN1 ONLY BE CONCLUDED THAT THE PROBABILITY OF A C0ff0NEiff OR SYSTEM FAILURE WAS INCREASED UNDER DESIGN BASES EARTH-QUAKE CONDITIONS. , PAGE9
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*(~l.TLE suusEEa Asse:cLv (eergen Pipresupport) ,
- 1. CLEANLINESS Cleanlincss is the most important part of this assembly. .
Cleanliness of parts, work-place, and the person who assenbles.,. , and tests the snubber will directly affect its performance. .. .. Some of the flow passages are cxtremely small cnd the plightest , chip, piece of lint, or particle of dirt will prevent the- ,
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- 2. PREASSEM'8LY INSPECTION ',
fisually inspect all parts for:
- l. Cutteel meLerial. '"
- 2. Surface finishes where specified:
- a. Gland ID d. Valve bores & neats i
- b. P.W c. Poppct curf;.cos ;
- c. O-Ring grooves f. Head bore and side with parts 1 Nicks or cuts,on all seals, & check fully to detail dwgs. I s 3.
- 4. Deburring of all parts especially at intersection of two holes and at threads. '
- 5. Chamfers and corner breaks. .
- 6. Chips, lint, dust, rust, dirt, etc.
- 7. Flatness of male pkg adapter. Use sur face plate & indicate l to within .003 T.I.R. on narrow part of adepter. I
! 8.
PARTS CLEAMI!;G Inspect piston rods for cracks using Magnaflu:: procesc. f' 6
~3.
Thoroughly clean all par ts immediately before assembly or sub-assembly in tr.tchloroethene. If any c1 caned parts are not p assembled durir.g the same work period they must be re-cleaned ( , during the next work period when they will be assembled and
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scaled. - CAUTION: . 1 Use trichloroethanc with precautions listed on ENG STD 3809.
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l 4. POPPET VALVE SEATING . I Use tool No. T-6359 and' fixture No. T-8390. Insert the scoting ! P _ tool into the valve body (3-5693) and apply 400 to 450 psi to ' the fixture cylinder, holding it for 5 se'conds. Repeat for opposite side. (SEE SHEET 6)
- 5. POPPET GRCO'I!NG
,. Use tool 2:o. I'd389 and fixture No. T-839G. Place the poppe,t
- blank in the toal cavity and apply proper pressore (see she w. 9) to the fixture cylinder. Hold pressure for 5 seconds. (See ,.
also. sheet 7) , jl; _ . _ _ . 2 -- in 1, ,
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ISSUED _ !** E - t 8 -, APPROVED ()- REVISED l-/0~68 C&Edo ,
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C.N. NO, 3R38 ' C; HANNA COMPAN'( ' A REX CHAINEELT CO!/.PANY
. NO. 3822 oc go . tmpga ENG_I N EE R I N G WClTS STANDARD TITLE S::UBBER ASSEMELY (Bergen Pipesupport)
_G . VALVE ASSE!OLY "' - Assemble the valve per correct parts list given on order. De ' i sure that all parts purchased or manufactured are clean. As - . part of the assembly install both manifold connectors,; tubes, and blocks. Torque the connector fittings and relief valve. .' seat to 216 inch-pounds. Do not torque the compression sleeve . fitting on the manifold connection tube more than finger-tight. Place a length of masking tape over holes in manifold blocks. Seal all three vertical holes with CA" parL plags.
]. VALVE TESTING )
Install the v { Close valves~31un 'n?nifold necembly :n th; valve test rig, leading to open (unused) ports and one valve J leading to valve under test.. A. Onen Ponnet Flow Rate (SEE SHEET 8)
- 1. Open valves 1, 2, & 3 wide. Crack open valve #9 S tar t pump. ,
- 2. Slowly close valve 3 until weight begins to rise. Control rise of weight with valve #9 so it will not close safety switch in less than 2 minutes.
- 3. Measure oil flow rate (see sheet 9 for limits) .
Adjusting valve #1 may be necessary to attain maximum flow rate. B. Ev-Pass Flow Rate (SEE SHEET 5)
- 1. Open valves 1, 2, & 3. Start pump.
- 2. Adjust valve 3 until gage reads 20 psi.
- 3. Measure by-pass flow through poppet orifice. -
Accept flow rates as listed on sheet 9. Poppets not passing these amounts can be re-seayed in die. Those passing more must ' be scrapped. _C . Poppet Oo2ninr: (SEE SHEET 4) '
- l. Poppets must open to free flow within 20 .
seconds after being subjected to more than 20 psi.
' Repeat above tests for opposite side of valve. After tcsting, install an SAE port plug, finger tight, in the center of the valve. -
l SHEET _ 2 o p ,l o _
I i' I ncy:Szo /-to-L e cdESD .f APT-ROVED ' G, . PM. C.N. N O.__3_f;L3 O f) HANNA COMPANY A REX CHAINSELT COMPANY ' N O . -- 3822 RECOMMENDED ENG IT4EERIN G PRACTICE STAN E, A R D TIT 1._E St:uns>:R ASSE:'.BLY (Bergen Pipesupport)
- 8. C7LU; DER AND ACCLgULATOR ASSS'<BLY .,
Look style carefully and stroke at the order to determine what mounting is required.
"^ ' 4 Assembla the piston to rod, - o -
torque as indicated on Sheet 10;;, and install g2 b pin. y . . Peen over grub pin using round nose punch with 0.375 r'adius. From this point on pay close attention to the sections on , Preassembly Inspection and Parts Cleaning. The cylinder . . must be just as clean as the valve and accumulator.' Tho . bench, vises, tools, and hands must be absolutely clean. Torque the tic rods as indicated on Sheet 10. .. When complete, apply nasking tapo over portc. Store the cylinder uncer cover find itsin awayclean inside. place since even the external dirt may 3g ~ Assemble the accumulator with the same care as the cylinder. Torque tic rods to 1CO inch-pounds. Install an SAE port protector plug in the port and turn in finger tight. Torque the Alemite fitting to 125 inch-pounds and the Seelscrew to S G inch-po und s . cover _ NOTE: Store the accumulator in a clean place and Use epoxy cement COAT SPRING WITH MAGNAFILM 31 PER ENG STD 3 13. 9. FILLING AND STATIC TEST on tail rod and Alemite fitting. Before removing the tapes from the cylinder, carefully clean the surface around the ports. When filling, use cican, filteredgiven lists drawing fluidon asthelisted on the assembly or parts order. extension. Pull the rod out to full upward. Fill both ends of the cylinder with ports fccing Fill the Valve-Manifold Assembly, install valve-manifold block manifold assembly cap screws with theto0-Rings specified and torque 125 inch-pounds torque. Do not torque the manifold p. connector fitting at this time. 5 Install transparent filler tube with clhow in center port
' of valve, and fill half full with filtered fluid.
the stroking rig, move the red in and out an inch orUsing ' until all air is bled cut. Pull the rod all the way two out, , adding oil as it is needed. so that valve plugs are up. Remove Rotate the snubber 90 degrees connect the high preocure pump to the the valve.filler tube and Pump until
' pressure gage reads 4000 psi. Lock for leaks at valve, tube fittings, manifold gland. Hold for one minute. blocks, tube-to-head seals, and Release, pressure and push rod all the way in.
; SHEET _3__ op _10 g . . . ,
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APPROVED' 1:3 5 U E D I O ~ Uvb C') U G , C*.,,r.- REVi$ED.]~/0- 68 Cd ESCO C,N. NO..__ 3_A 3_8 HANNA COMPANY . . A REX CHAINDELT COMPANY !. i
' 3e22 ,
NO. - . RECOS* MENDED PRAcTrcE STA N D A R D ___ _ EN G I N,_E,ER I N G . SuuasEn ASSExany (aergen Pipesupport) TITLE .a ,
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- 10. FINAL ASSEMBL'I ~l With the snubber still in the stroking rig,Screw set the accumulator' '
i the (freshly e loosely in place without the cap screws. i cleaned) SAE elbows loosely into the valve and accumulator ports'.* kith the Install the connecting tube assembly (freshly cleaned) . compression nuts hand tiaht. Insert the cap screws Torque to hold the- - [ the accumulator in place, torquing to 125 inch-pounds. bent tube compression nuts and the SAE elbow nuts to 125 inch-l pounds. Torque the manifold conncctor fitting to at this time to rod threads l 125 inch-pounds. Apply rust preventive coat : per ENG STD 3032.
,11._Keep FTLLIIiG AMD TESTINGin the stroking rig with necumulator on top. j the snunber Pump filtered fluid into accumulator until tail rod extends abount one inch.
J Loosen bleeder adjusting screw until fluid begins to leak out. B1ced until no more air bubbles appear. Tighten bleeder screw. With the stroking rig, compress snubber all the way, being careful not to get sprayed by oil from vent hole. Pull snubber out and push back in thru full stroke. Test for lock-up in both directions. Bleed tail rod into dimension shown on drawing. Full snubber rod all the way out.
- 12. INSPECTION Check leakage with a blotter Cle2.n snubber in tri'chloroethane.
with unit on a clean piece of paper. Micrometer readings of tail rod projection are to be taken and recorded on dated tag ' ' under the following conditions. (1) Twice daily, morning and af ternoon at approximately the Should a large variation appear same time, for three days. on'all units, it may be due to a large difference Disregard such in the daily readings change in the ambient temperature. and extend test one more day. Af ter the first 21 hours rods should move in and out with temperature only. Those whose readings which continue to increase should be checked for leakage in accumulator r (/ 13. PAINTING- Mask rod cnd and face Clean ass'embly and paint per ENG STD 3810. I of front. fim.gc mountingc. Af ter t-hin oneration handic the units { carefully to avoid dar.iaging the rnint fi^nish. 3 SHEET 4 OF 10 .
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y -- HANNA COMPANY A REX CHAINSELT CO.'<1PANY N O .- 3822 ENGINEERING RECOMMENDED _P R_A_C.r t e s STANDARD TITLE > TORQUES FOR 3ERGEIT PIPE SUPPORT UNITS All torques are inch pounds unlers otherwise specified . . , . . . ACCU'iULATOR 2.50 BORE _3.25 BORE 4.00 SORE' TIE RODS " 100 f tJLS 100 14 ts 100 4-LS PROTECTIVE TUBE NUT 216 216 ' 216 PISTON ROD EPOXY EPOXY EPOXY MOUNTING SCREWS - 125 125 125 ALEMITE FITTING' 125 I 123 125
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NEW A R K, NCW JcRSE Y C7f02 Rin_../l' Qono-July 30, 1973 Th oi; c Listed lielow: DEFECTIVE IIYDRAULIC Sil0CK SL'PPRESSCRS AND RESTRAINTS The enclo:;ed Regulatory Operaticas Bulletin (Enclosure 1) was forwarded to the Licensees listed in Enclocure 2. m9.o'9;A 0-o mes P. O'Reilly Di ector Encl osure s :
- 1. Bulletin No. 73-3 )
2 List of Licensecs Receiving Bulletin 73-3 Addressecs: Branch Chiefs, RO j Assistant Director for Procedures, RO Assistant Director for Inspection & Enforecment, RO Assistant Director for Plans and Programs, RS i Director, L Deputy Director, L Assistant Director for Boiling Water Reactors, L (3) Assistant Director for Pressurized Water Reactors, L (3) Assistant Diccctor for Operating Reactors, L (3) Assistant Director for Environmental Projects, L (3) , i R. A. Fraley, ACRS RO Files DR Central Files Central Mail & Files Unit t OGC ! i i i
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o O RO Eulletin No. 71-3 July 27, 1973 DEFECTIVE hYDiUtULIC ST!M K SUPP"ESS? " A?.D PE rRAINTS Infornation containel in an aluormel s cu nce repo r t frer the Mil t atone 1 reac tor , supp' ~m< nted by add it iona l informat ion ebtained by Regula tory Operations frc, other licensees, reveal"d that 51 of 120 hydraulic shoch suppressors and restraints insrectcJ were defective due to loss of hydraulic oil supply. These suppressorr a n'! rentraints were manufactured by the Bergen-Patterson Company. In tl.e light of this information you are requested to take the following specific actions: , 1 A. Determine whether Ecrgen-Patterson hydraulic shock suppressors and restraints are utilized in safety systens within your facility. Report the results of this determination to this office by noon, Monday, July 30, 1973. i B. ! If Bergen-Patterson suppressors and restraints are utilized in such systems: 1. Inspect prior to noon, July 30, 1973, each suppressor and restraint for proper hydraulic fluid level. 2. Report by telephone to this office by noon, Monday, July 30, 1973 the results of your ac tions to show: } i n. Number of suppressors an1 r'estraints installed in safety related systens.
- b. Number inspected.
l c. Number defective by codel number and location of installation and failure code. !
- d. Cenfirnation of eperability of defective suppressors and restraints.
j If repairs are not cor.pleted, ycur justification for continuir i operatien of your plant and your schedul e for cenplet ien of re; m'_rs . ' e. Existinn, or planned surveillance schedule for suppressors and ' reatraints. god
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- 3. For plants with existint surveillance of supprerscrs and res t rain t s, f if your inspection b.n been performed within the last 30 days g and there it no his tory of def ec tive supprercors and restr. tints y
or if all were repaired, this reque_s t for inspection prier to noon July 30, 1973, docs not apply, i i C. Reporte made in reganse to A and E, above, should be confirmed in ' writing within 10 days. D. For facilities wi th no Bergen-Pat terson suppressors and restraints or with existing surveillance inspec tions of suppressors cnd restraints:
- 1. At the next reacter shutdown, inspec t all hydraulic suppressors and restraints in safety related systems. Inform this office of your schedule for this inspection by noon, July 30, 1973.
- 2. k' hen the inspection is performed, if def ective suppressors and restraints are identified, the results of your inspection should be reported immediately by telephone to this office and confirmed in writing vithin 10 days. This report should inclu'e:
a. Number of suppressors and restraints inspected, icentified by manufacturer.
- b. Number of defective suppressors and restraints.
- c. For each defective suppressor and restraint report:
(1) re.anufacturer (2) model number (3) location of installation (4) failure mode
- d. Confircation of operability of defective suppressors and restraints.
If repairs are not cecpleted, your justification for operation of your plant and your schedule for completion of repairs.
- e. Surveillance schedule.
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If no defective suppressors and restraints are identified a report should be subn.itted within 10 days of completion of the increction to show the number of suppressors and rest raints inspected identifiet by manufacturer and todel number. If you have any quest ions concernirg this request, please contact this affice. Sincerely,
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iDirector, Region I 5
' Directorate of Regulatory Operations
, (Enclosure 2)
Licensee Docket No. Boston Edi';on Company 50-293 i Connecticut Yankee Atomic 50-213 l Power Company l Consolidated Edison Company 50-3 of New York, Inc. 50-247 Jersey Central Power & Light 50-219 Company Maine Yankee Atomic Power 50-309 Company Millstone Point Company 50-245 Niagara Mohawk Power Corporation 50-220 Philadc1phia Electric Company 50-171 ! Rochester Gas & Electric 50-244 Corporation i Vermont Yankee Nuc1 car Poacr 50-271 1 Corporation Yankee Atomic Electric Company 50-29 i I 4 i Il 1 o l: I ll Il ___ -- .- - -}}