ML20052F746

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Discusses Review of Info from State Power Board Re Application for Plugging Steam Generator Tubes.Safety Analysis Incomplete.Application Not Approved
ML20052F746
Person / Time
Site: 05000000, 05000465
Issue date: 12/18/1981
From: Mandeus G
SWEDEN, GOVT. OF
To: Lafleur J
NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP)
Shared Package
ML20049H209 List:
References
FOIA-82-167 NUDOCS 8205130560
Download: ML20052F746 (5)
v • d • e


Text

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ATTENTION: JOSEPH LATELUM i

OTTICE OF INTERNATIONAL PROGRAMS i

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URGENT UF. GENT URGENT I

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THIS MESSAGE SHOULD F.EACH THE PERSONS '4H0 VILL EE IN TELEPHONE CONTACT VITH THE SPANISH AUTHORITIES CONCERNING i

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AEAEA ALitARE IN AN HOUR.

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43. RINGHALS.3 - PLUGGING OF STEAM GENERATGh TUBES 3

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I g THE SWEDISH STATE POWER BOARD CSSPB) HAS MADE AN APPLICATION '.'

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?o TOR PLUGGING 57EAh GENERATOR TUBES IN RINGHALS 3 T0.iME..

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SVEDISH. NUCLEAR POWER INSPECTORATE (SHI). SHI HAS R. EVIEVED rU

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oe 4 m THE INTORMATION FROM THE POVER BOARD AND TOUND THAT. THE SATETY

! 31 M'l A!!ALYS15 IS NOT COMPLETE AND THAT THERE IS A RISH THAT THERE

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20 VILL BE NORE TUBEDETERIATION IF RINGHALS 3 VILL BE OPERATED -

j AT 'F.EOUCED POVER VITH FLUGGED TUSES** EECAUSE OF THAT THE INSPECT 0EATF. ELIT*T t THr azottraTenst

t i BILOV; YOU VILL TIND A N.CRE DETAILED INTOFEATION A3OUT CUR '

DECISION

  • AkCN IS A NOUGHT TRANSLATION FROM OUR REVIEV EPM.-

VMEN REVIEVING.THE INTOT#ATION TROM THE STATE FCVER 30ARDi l

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VE HAVE NOTED THE TOLLOVING THINGS:

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1. THI POVER 30ARD REFER (N THEIR' APPLICATION FOR PLUGCING i

i TUEES, AS AU FREFARATION TOR BACK 70 POVER, TO THE USNR0 l

GU1DE I.121. THIS GUIDE MENTIONS ADE0CATE SATETY MARGINS FOR CONTINUID OPERATIONS WITH DAMAGED TU2ES AND EY THAT MEANS' *. ~

CR,ITERI AS TOR PLUGGING FRIMARILY IN CCNNECTION VITH DENTING CP{CORROSSION. IT RETERRING TO THE GUIDE CUR OFINION IS T.hT THE CAUSE OF THE DAMAGES AUST SE COMPLETE CLARITIE

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A!!D THE RISK TOR MCRI TUBE DETERIATION MUST BE ALMOST ELIMI-NA.T ED. IT THE TU3E DAMAGES AS IN THIS CASE DEPENDS ON VI' RING CAUSED BY VIERATION THE CONSECUENCES MUST BE A.

A BIGGER GAP 3ETVEEN THE TUEIS AND THE 2ATTEL PLATE 5. SECAUSE OhTHATTHESTAYINGOFTHETUBLShUST3ICARITULLYANALYEED.;

SKI HAS NOT GOT ANY ACCEPTABLE ANALYSIS OF THAT HIND.

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03 THE CONTRARY THE INFORMATION VHICH VE HAVE GOT TROM THE I

$*.7. DISH POVER BOARD AND VESTINGHOUSE TOCETHER VITH THE EXPERIENCES WHICH j

V5 HAVE CONCERNING ALMARAE SHOVS THAT THERE IS,A GREAT.

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RI,3M TOR HORE TUBE DETERIATION IT THE OUTLINED,OFERATION n,

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PROGT.AM ON 62 DAYS AT.SE 0/0 VILL TAKE PLACE.. e'

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2. IN AN APPENDIX TO THE PRESENTED APPLICATICN d' GRAPH DVER i
  • *lJLUID ELASTIC STABILITY RATID * '. INDICATES THE -JU l

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  • THAT BY Ist D/0 POWER,. THE THRESHOLD VALUE FOR1THE
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g ST,RIAMING VELOCITY OF THE TEED VATER VMERE INSTABILTIES).l i t.

l START TO OCCURJ IS EXCEEDED. IN THE EARLIER PRESENTED.;,

SATETY ANALYSIS REFORT IT 'HAS BEEN STATED THAT THIS !*...

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l THRISHOLD VALUE MAS SEIN CONTAINED BY A TACTOR TVD.TO.;.

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4 THREE. THE MISJUDGEMENT IN TEE DESIGN ND*4 APPEARS 70 :3E...:.

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SER10US.

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AS EVIDENCE THAT CPERATION AT Si, 0/0 POWER SHOULD BE POSSI3' E AT RINGHALS 3 VITHOUT RISHING INSTABILITIES. TROM THE ORAL PRESENTATIONS IS SECAME CLEAR THAT THE CURVE 1,5 U'

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BASED ON COMPUTER MODELS AND E0")EL EXPERIMENTS

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3 VHICH DO NOT TAME ALL PHYSICAL PHENDEENA OCURR1NG IN THE I

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3 REAL S27UATICK INTO ACCOUNT AND THAT THE H0DELS USED' l

HAVE,NOT 3EEN,VER! TIED BY MEASURIMENTS IN THE ACTUAL,

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STIAM GENERATORS. TURTHERMORE IT HAS 3EIN RECOGN1 ZED j

THAT THE CURVE HAS BEEN COMPUTED TOR UNDAMAGID TUEE'"

VITH ADECUATE SUPPORT IN ALL SATTLE PLATES AND NOT TOR DAMAGED TUBES AS THE CNES IN RINGHALS 3 VITH SUBSTANTIALLY INCRIAST'D CLEARANCE IN THE SUPPORT PLATIS AND THUS

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POSSIELY POSSESSIN'1 A LARGEE FREE OSEILLATING LINGTE. '

i IN A RECEANTLY PUBLISHED SCIENTIFIC PAPIR SY A VESTINGHOUSE

  • EXPERT IN THIS SUBJICT ARIA, IT IS SHO'.'N THAT THE TLUID VELOCITY AT WHICH INSTABILITY 3EGINS TO APPEAR 15 EELIIVED TO BE DIRECTLY PROPORTIONAL TO THE NATURAL TRICUENCIES OF THE TUBES. THESE NATURAL TREQUENCIES DIPEND ON ONE FREE LENGTH

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0T THE TUEES BETVEEN SUPPORTS. IT THE SUFFORT IN ONE OR

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l TWO PLATIS IS LOST PARTLY OR IN VHDLE, THE NATURAL TRICUENCY MAY DROP SUBSTANTIALLY. PPRCX1MATELY BY A TACTOR OF A,70 2. ACCORDING TO THE THE0KITICAL RODEL i

CITED SY VISTINGHOUSE, SHI THRESHOLD TLUID VELOCITY TOR INSTA32LITY TME DROPS 3Y TNI SAME TACTOR OR DOWN INTO THE REGION OF VHAT CAN BE DESCRIBED AS 2DLING POVkR TOR THE PLANT.

4. 'S.SPB SHOWS IN ITS BASIC DAT.A A TEST OPERATION PROGRAMME,I 4 PROPOSED'BY VESTINGHOUSE, FOR MC GUIRE WHICH HAS AN'U!bAhAGED STIAM GENERATORS OF,THE 'SAME DESIGN. THIS TEST 'FROGRkMed;'15 "

MORE CAUTIONS THAN THE PROGRAMME DUTLINND BY SS'PB AND'WES'/ inh

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80USE FOR PLANTS VITH DAMAGED GENERATORS.

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,5., SHI,HAS' ON D1TTERENT, OCCASIONS. PO!NTED OUT THAh 'BY RESUiN.D

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OPERATION,THESE SHOULD BE A RISH THAT PLUGGED TU3ES.GET !L I

m WORN OTT AND GENERATE' LOOSE PIECES OT. SCRAP: VHICH IN THEIR TURN CAN VEAR,0TT EARLIER' TAUTHLESS TUSES. TH5' i

i REPRESENTATIVES OF SSPB HAVd:REJECTID THIS RISM IN

  • THE SAME TIME AS ACCORDING TO VRAT SMI NOV HAS COLLECTED - THE SAMI VARNING MAS BEEN PERTCRMID TO THE MANUTACTURER IN au nT*ac m *'ea***"

6.* TNE ASSESSMENT OT SEI IS THAT A CONTINUATION OF TEE A

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hi OPERATION. 07. RINGHALS'.3.VITH ITS FAULT IN ;THE' DESI GN -

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p i-If NOT GOOD TECH THQ* REACTOR SATITY POINT 0TIVIEV.'

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i THE ACTUAL SATETY ANALYSIS CLEARE E E

'.O t THE ACTUAL SAhETY' ANA YSIS CLEARLY'SHOVS TEAT AN INCREASE 4

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CT T.lRANSIENTS TOR.IXAMPLE SMALL LEAKS IN THE PRI ARY C0CL D'4 CIRCUIT IS DIRECTLY ASSOCI ATED VITH AN CORRISPONDING INCREASE

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  • 1' 0F THE RISK AS TO SERICUS ACCIDENTS. THE EXISTING TUEE DETERATION ALSO l2NCREASES THE RISM 'TO'R MULTIPLE TU3EERIAKS POSSISLY '.

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IN MORE THAN ONE'STEAMGENERATOR. '

9 SUCH TRAt:SIENTS VOULD PUT CONSIDERABLY SHARPENED CLAIMS ON

. TRE SATETY SYSTEMS OF TXI REACTOR AS VILL AS CN THE HANDLING i

CT THE OPEP.ATION PERSCNNEL, ESPICIALLY VITE REGAED TO THE TACT THAT THOUROUGHLY ELA20 RATED DISTURBANCI' INSTRUCTIONS FOR SUCH SERICUS TRANSIENT Dc NOT* YET EXIST. IN THIS CONNECTION IT SH ULD ALSO EE.NOTED THAT THE CORI OT RINGHALS 3 SHOVED A CERTAIN TUEL LEAXAGE 5URING THE LATEST OPERATION IN OCTOBER 'i 1951. THI TUBES ARE THIT.ET0RI THE ONLY REMAINING EARRIER e

AGAINST A LEAKAGE OF RADICACTIVE SUBSTA'NCES TO THE TURBINE-PLANT IN CASE OF RELEASE TO TKI INVICRNEMT TROM SAFETY I t

VALVEiIN THE SECONDARY COOLANT CIRCUIT THE TU3ES TORM THE ONLY REMAINING DARRIEP AGAINST DUTLETS TO THE ENVIORNMENT, EVEN IT IT IS SO THAT SUCH OUTLETS IN CONNECTION VITH

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2 MINOR tTUBE LEAKAGE CAN BE EXPECTED TO BE SEALL 3Y THE PRESENT l

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SKI's COMPRIMENSIVE JUDGEMENT OT.SSPS'S PLUGGING APPLICATION,

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. ti 2-SH1 FINDS THAT AN APPLICATION FOR PLUGGING OT DAhAGED. T.UB. ESl..SHOULD NE

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NOT BE HANDLED SEPARATELY. IT SHOULD BE JUDGED IN CONNE.CT.I.O.N VITH A DESCRIPTION OT A, PLANNED CPERATION PROGRAMME AND, A.p THOROUGH ANALYSIS OF TURTHER RISES FOR TU3E.DAEAGES IN f.SUCH.,.

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' AN OPEMTION PROGRAMMI. APART TROM PLUGGING;0THER POSSkBLE

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SOLUTIONS SHOULD BE REPORTED WITHIN THE PLANNED 0PERATION r '

.i PRO CEAMME. SSFB HAS 50 TAR NOT TORMALLY REPORTED SUCH A..

FRCFOSLD OPERATION PROGEAMMI. BECAUSE OF THIS, SHI HAS NOT BIEN ABLE TO JUDGE THE PLUGGING APPLICATION ON ANY OTHER.

3 DASIS THAN THE OUTLINED EXAhPLE OF AN OPERATION PE0 GRAMME. -

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-ATTER HAVING REVIEVD THE TACTS (SUMMARIZED IN POINTS) 1-6 A30VE - SHI'S CONCLUSION IS THAT SSPS'S APPLICATION

.e-TOR PLUGGING IS BASED ON A 700 INCOMPLETE SATETY. ANALYSIS OF THE RISES FOR TURTHER TU3E DAMAGES. THEREFORE, THI-AFFLICATION CAN NOT BE APPROVED.

BEST REGARDS v

GORAN MANDIUS 18

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.s' THI SWEDISH NUCLEAR POWER INSPECTORATE"""

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