ML20085B575
| ML20085B575 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 05/06/1972 |
| From: | Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20085B488 | List: |
| References | |
| NUDOCS 8307080197 | |
| Download: ML20085B575 (4) | |
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C O TLX CONSPOWER JKN gl Western union ZIP G0137
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Cli1 CA JO OPatA flu!JS OFFICE UNI f dD SfA f ES ATOMIC EtJERGY COMMISSI0tJ Q aLEN ELLYN ILL 60137 O
e CONSUMED 3 POWin COMPAtJY JACKSON MI CllI GA fJ Q
5-zG-72 10:56P EDT g
M.c d G CASd"S LdTTER OF MAY 19, 1972 REQUESTED THAT PRIOR TO O nESUMI Nd RdACI0d OPERATION, CONSUMERS POWER COMPANY REMOVE TliE g
PALISADiS ildACTod VdSSEL HEAD AND INSPdCT THE COMPdNSAIING RING SHIM AND Tlid UPPin GUIDE STRUCTUitE.
If FURTHER REQUESTED THAT Q
Illd RESULTS OF THIS It;SPECTION, IOGdTHER WITH OUR ANALYSIS OF TliE g
SUI fab 1LIfY OF Tlid REACT 0il Fait FUTURE OPERAIION, ad itEPollIED TO YOU.
IliIS TWX IS WRIfTEN TO PROVIDE THE REQUdSTED REPORT.
42 HAVE COMPLETED A DETAILED INSPECTION OF THE PALISADES UPPER JUIDE STRUCTURE COMP 2NSATING RING SHIM, UPPER GUIDE STRUCTURE, O INTEdNALS ALIGNMENT KEYS AND VESSEL CLOSURE HEAD MATING SUR-g FACIS AS MADE AVAILABLE BY REACTOR VESSEL HEAD REMOVAL.
O THE P0HTION OF THE 5/8 INCH SHOULDER BOLT RECOVERED liROM THE g
NO. 2 STEAM GdNERATod INLET PLENUM ON MAY 7 1972, WAS DEIERMINdD fo HAVE COME F;iOM THE No.1 LOCATING BOLT POSITIotJ ON THE UPPER l O auIDI ST.tdCTUdd RIN3 SHIM.
IliE RING SHIM BOLT LOCATIONS WditE g
STA7,P MA.;KdD AU FOLLOWS/
/1 AT 146 DEGREES, /2 AI 101 DEGRidS,
/3 A f 96 DdadddS, /4 AT 11 DEGREES, /5 AT 326 DdGREES, /6 AI 281 O
Dim..'CES, /7 A f t3G DdGREES, AND /8 AT 191 DEGREES, THE 180 DE-g i
d.u.dS AZIMUfhAL OdIENTATION OF THE HING SHIM CORRESPONDING TO THE l
Nod f H ALIJNMENT KEY AT 180 DEGREES.
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l IHd 5/8 INCH SHOULDER UGLI LOCATED AT POSI TION /7 WAS FOUND TO l Q uEdlN, AS WAS Ilid /1 UOLT PORTION PRdVIOUSLY RECOVERED.
ud SdVdadD Af THd dND OF THE SHOULDER SECTION WHeliE THE THREADS l
THE Rd-g ACf03 VdSSEL HiAD APPARENTLY COVERED A SUFFICIENT PORIION OF THd COUNTE.iUORE TO EFFdCTIVELY CAPTURE THE BOLT HEAD AND SHOULDER POR-O fiON OF THe Cne screw.
THE LOOSE e0RrION OF THE /7 BOLT WAS Rd-g MOVED.
O IN ADDI FION TO THE ABOVE OBSdRVATIONS, DIMENSIONS WERE TAKEN AND g
adCO3DdD Iti ACC0dDANCE WITH THE APPROVED PROCEDURE USED FOR THIS I NVdS TIGA fl 0N.
THESE DIMENSIONS PLUS OBSERVATIONS LEAD US TO Q
fHddi CONCLUSIONS:
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THEdE IS No SIGNIFICANT SHIFT IN POSITION OF TH5 RING SHIM Q HILA FI Vi TO THE UPPin GJIDE STRUCTURE FLANCE AS COMPARED TO SIMI-g L/w DIMENSIONS HECOHadD IN SEPT 19G9.
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THide. IS fl0 EVIDENCS OF ANY ADNCHMAL MOTION BETWEEN THE RING g
SliI M, UPPEa Julod SIHUCTURE, CORZ SUPPORT BAHHEL, HZACTOR VESSSL nUO ddAC fon VESSEL HEAD.
3 THE NUnMAL IfJ01 CAT 10tJS RESULTING FHOM COMPONENT INSTALLATION AND HEMOVAL AND BdAttING vf ONE COMPolldNT AGAIDST ANOTHdd WERd Q OuSidV20 Id HEACTOH VESSEL HEAD TO ALIGNMEfJT KEYS AND ilEACfoil g
VdSSEL HEAD TO HING SHIM, Q
4.
THEdE WAS NO EVIDENCE OF ANY VIBRATION OR FitdIIING OF THE g
MAJ0a COMPONENTS.
THE ONLY INDICATION OF VIndATION WAS THd FACf FHA f THE /7 UGLI APPARENTLY JIGGLED IN ITS liOLE SUdSEQUENT TO Q
FA I L Ua r. AND CAJSid A SMOUTH SUHFACE AT THE FitACTutti AND ALOND g
fHc LOWZo SECTION OF fild CAP SCHEW Si(0ULddH.
Q wc HsVi CONCLuddo IHAT Tild CAUSE OF THE FAILURE ORIGINATED WITli g
flic ACC10dNf 00 DING SHIPMENT OF THE UPPER GUIDE SfauCTURE TO THE SI f E IN MAY 1969.
INSPdCTIONS CONOUCTED SUBSEQUENT TO THAT AC-Q CIddNT INulCAliD TWO A idAS OF SIGNIFICANT GOUGING ON THE RING g
SHIM.
THE HEAVIESI dOUGd EXISTED AT 140 DiGitdES AND WAS S/16 INCH WIud BY G-1/4 INCHES LON3 BY 3/64 INCll DEdP.
FOUR Q
joJ3dS Wda d RdP0d f dd A f 240 OdGRidS, EACH G0dGE BdING APPROXI-g MA FELY 3/16 I NCH WIDE BY 1/2 INCll LONG BY 3/64 INCH DEEP.
f H2.id Win E NO OTHEu GOUGES ON Tlid HING SliIM DESPEit IllAN 1/64 Q
INCH DIEP AucuT 1/G4 INCH IN DIAMETER.
ALL GOUGIS WERE SUdSE-g GUINILY DLENDED IN PHIOR TO USE OF THE UPPEil GUIDE STRUCTURE.
Q I f IS SluNIFICANT THAf THE /1 LOCATING BOLT WAS AT 146 DEGHEdS, g
fMI POSIfl0N OF f HE lidAVIEST GOUGING BEING AT 140 DEGREES, ANJ FHA f Ilic /7 HOL T WAS AT LOCATION 23G DEGREES, WITH THE FOUd SIMI-Q LA. HEAVY Gudic.J ddI NJ A T 240 DIGRdis.
WE THdHEFORE CONCLUDi g
THAT THc IMPACI F0dCd3 WilICH CAUSEo Tlid G0036S AT 140 DiGHEES A NJ L-40 di S.ddJ iiESULTid IN HIGH IMPACT LOAOS IN THE uoLTS LO-Q CAfdd Af 146 DijdEES ANJ 23G DEGH6dS //l AND /7 RESPdCIIVELY/
g sHICli UL TIMA fELY LEAD TO THdlit FAILUHE.
IN A00lTION TO THESd INPACT F0 acid Aud DING DEF0iiMATION RdSULTING FROM THE ACC10idf, Q
filidd AdE THd No.iMAL LOADS ON THE HIN3 SHIM LOCATING BOLIS DUI g
TO OVALI fY OF THE HINJ SHIM DuilING MANUFACTURE AND ORIGINAL SHOP I NSTALLA IION, PLUS THE NORMAL LOADS WHICli Tlid RING SHIM IS Sub-Q JiCico f0 DURINJ VESSdL CLOSURE HEAJ INSTALLATION ANJ HEMOVAL, g
PLA Nf HEA TUP AND C00LDOWN, AND VARI ATIONS IN AVdHAGE C00LANf FEMPidA TUHi DURI Nd OPEH A fl0N.
COMBINATIONS OF THESE LOADS Q PHOPAGA TED THE FAILUHE OF BOLTS /1 AND /7.
g fHIS FAILJHL MECliANISM IS CONFIhMEd BY THd METALOGRAPHIC EXAMI-Q NA TIONS PidFedMid ON THE /1 BOLT.
THE METALOGRAPHIC EXAMINATIONS g
SliU W Ille. FAILudc. MiCliANISM TO BI LOW CYCLE FA TIGUE FROM HEAVY SIJi LOAJIN JJ.
THESE EXANIDA fl0NS ALSO SHOW THAI THE FAILURE WAS Q IMPACf INIflAfid, 4HICH COHiidSPONDS TO Thi SHIPPING ACCIdiNT, g
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O TO P.idCLUDI Tild POSSlulLITY OF FUiiTHEfl BOLIS dSCAPIN3 FROM Tlid Q JI N.i SHIM,
- HAVE INSTALLdd LOCK DAHS IN ACCoitDANCE WITH THE g
APPa0Vid PacCcaudd AT ALL G itdMAlfjING DOLT LOCATIolJS.
THE fHaiaJid PoafluNS OF fHi /1 ANO /7 UOLIS RdMAINING IN IHi O
JPfan ddIJE SfadC ruaE Ft.ANJc ARE CAPTundJ DY DOWELS INS TALLED g
nhJInLLY Thauddli THE UPPid GUIDE SinUC f udd FLANGE AND PLUG WELddo.
O SHOULD AJDIfl0NAL DOLIS FAIL, fHdY WILL ud HELD CAPTIVd BY Tild LOCK g
cAaS.
- HILE FAILund UF ALL LOCA TING BOLTS WOULD DEFEA f THdId FUNC-TION OF MAINI AININd THE POSITION OF THE RIlJG SHIM ON THE UPPin Q
JUIDs SfdUCTudE f LANdd DuaINJ REFUELING OPdHATIONS, SUCli FAILURd g
woULD HAVE NO AFFdCT UPON UPidATION OF THd HdACIOn.
THi PadSdNT LOCATION OF Titi RING SHIM Pi10VIdds G00J CONfACf WIIH THd CLOSuild O HEAD.
THIS CONTACT WOULD NOT BE LOSI SHOULD Tlid LOCA FING BOLfS g
FAIL SINCE THd ALIGNMENT KEYS WILL PHOVIDs THE NECESSARY POSITION-INi 0F fHE HIlu SHIM IN IHAT EVENT, I N ADDI f10N TO INSPECfl0NS PdHFORMEJ ON MAY 24 AND 25 1972, THE uPPca GUIJE STadCTUni WAS INSPECTdo SuaSEQUENT TO RIMOVAL OF THE O
VdSS.L CLUSudd HEAD ON NOV 30 1971.
IHS UPPdd GUIDE SfiluCTURE WAS g
ConPLdfdLY ddMOVid Af THAT IIMd AND THd FUEL BUNJLd ALIGNMENT PLATd, FudL ALIGNMENT PINS, LOWEH ALIGNMENT SLOIS AND LOAD CAHHYING Q
Sud FACd3 WdaE I NSPECTED.
NO INDICATIONS OF UNUSUAL MOTION OF THE g
UPPia GUIJE SfKUCIUHd Wind OBSdHVED.
PRI0fl TO THIS flMd THE UPPid GUI0d SfhuCIUMd HAD BdEN IN SdHVICE WITH INSTALLED FUEL Q UUNOLES DudINd POSI-CORE LOADING H0f FUNCfIONAL TdSI, INITIAL g
CHI f1CALI fY, ANJ Zddo POWiH PHYSICS TESTINS SINCE APRIL 1971.
IN ADDI TION, THd UPPdH GUI0d STRUCTund HAD BddN INSTALLEO 00 RING Q ALL PddCOME Hof FUNCTIONAL TESTS CONDUCTED DuitING Tlid PERIOD g
MA d Cll 1970 TO MAhCH 1971.
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IN SJMMAaY, Lc CUNCLUOz IHAf fHd POSTULAfdu SOURCE OF THE BOLT Q
Fu Jfh) ON MAY 7,
197P, DESCa ludi) IN UUa TWX OF MAY 15, 1972 AND g
Ldff:.J uF MAY IG, 1970 HAS oddN PHOVdu TO DE ACCURAId.
FURTHER-Mo.. d, we. liAV:. Nui FOUNJ ANY CONJI fl0NS TO EXIST WHICli WOULD NOT Q ac EXPEC fiD Fa0M NORMAL OPdHA fl0N.
IT IS OUH OPINION THAT THE g
acACfun IS SA fISFACIORY Fud UNadSTHICIdo OPdHATION AT LICENSid Pu u c.. LEVdL3.
A S OF flil S WaI TI NG, THE ttdACIGH VdSSEL lidAJ IS BdIN3 INSIALLdd.
Wi PLA N TO iidf un N TO POWid NdXT WidK, POSSlulY AS EAdLY AS O
WEONESDAY, MAY 31.
Wd WILL ASSUME YOU ARE IN AGHdEMENI WITH THIS g
COUdSi 0F ACTION UNLESS YOU INFORM US TO T}ld CONTRAHY.
O d D SEWELL g
NUCLEAH LICENSING ADMINISTHATOR CONSUMEHS POWid COMPANY O
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B H dd I d.:
ChICA Ju OPdu A fIONS OFFICd Q
UNIId0 STA fdS ATOMIC ENdHGY COMMISSION g
GLEN ELLYN ILL 60137 O
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