ML19241C084
| ML19241C084 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/10/1979 |
| From: | Henningson P BABCOCK & WILCOX CO. |
| To: | Meyer G BABCOCK & WILCOX CO. |
| References | |
| THE-79-190, NUDOCS 7907260572 | |
| Download: ML19241C084 (4) | |
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j THE IMSCCCK & W:LCOX COMPANY
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POWER GEME7AT10N GROUP l
To lG. A. MEYER, MANAGER, T-Il ENGINEERING UNIT TiiE - 7 9 - 19 0 Vdf '?N y P. J. HENNINGSCN, T-H ENGINEERING UNIT. EXT 3515 12E12.13
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TMI-2 660-021A Date Subj.
DAMAGE MCDEL - FLUIDI ED 3ED I
ARIL 10.
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REFERENCES,:
1)
MDio, COR5 CCNDITION TASK FCRCE TC J. S. TULENKC,
" CURRENT ASSES 3 MENT CF CORE CONDITICN, AFRIL 7, 1979 (1300)," APRIL 7, 1979 (7:43 PM) 2)
PERRY'S CHDIICAL ENGINEERS :-MNDEC0K, FOURTH EDISCN, PP. 549 - 551.
3)
MDIO, P. J. HENNINGSON. TO G. A. MEYER, "?CSSI3LE MODE OF INCREASED T.C. READINGS," AFRIL 7, 1979.
THE DAMAGED TMI-2 CCRE WAS HYDRAULICALLY MODELED AS A PACKED SED.
THE MECHANISM OF FUEL FAILURE NCULD RESULT IN APPROXIMATELY THIS GECMETRY IND 33 LCCATED IN THE UPPER REGICN OF THE CCRE.
3RIEFLY THE CORE WCULD 35 CCNFIGURED AS UNDA'tAGED FUEL UP TC A HEIGHT WITH DAMAGED FUEL (FUEL PARTICULATES AND CLADDING) A3CVE THIS RESE!3 LING A PORCUS MASS; THE 3ASIC CONFIGURATION OF THE CCRE WAS OSTAINED FROM REFERENCE ~ L.
THE CCRE WAS ASSUMED UNDAMAGED AT THE PERIPHERY N!TH INCREASING FAILURE TONARDS THE CENTER.
PARTICLES CF FA! LED FUEL Nii!C:! CC' IPR!5ED THE FLU! DICED EED NERE ASSUMED. TO EVCLVE FRCM THE FCLLONING FAILURE 79072 6os7e
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r G. A. MEYER APRIL 10, 1979 PAGE 2 THE FUEL CRACKED ALONG TWO PERPENDICULAR AXES LENGTHNISE AND PL M C5 l
ALONG THREE 2:35 PERPENDICULAR TO ITS AXIS.
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1 THE MASS OF FUEL NCULD THEN CONSTITUTE THE MAJORITY CF-THE CONGLOMERATE NITH CLADDING F?lCMENTS ASSUMED TO htWE A SIMILAR
,GECMETRY.
A SUITABLE CORRELATION FOR PRESSURE DROP THRCUGH A PACKED 3ED NAS OSTAINED FRCM REFERENCE 2.
THIS CORRELATION (ATTRI3UTED TO LEV 1)
NAS APPLICA3LE IN THE HIGH REYNCLDS NUMBER RANGE EXISTING IN THE DAMAGED CORE (RE s 10,000 ).
IT IS IMPORTANT THAT THE RANGE CF REYNOLD'S NUMEER APPLICA3ILITY 3E ASCERTAINED FOR A GIVEN CORRELATICN.
To THE SENSITIVITY OF THE. FRICTION FACTOR da CHANGES IN FLON FROM VISCOUS TO TUR3ULENT IN THE PACKED 3ED CANNOT BE NEGLECTED.
AN ATTEMPT TO MODEL THE CORE AS DEFINED IN REFERENCE 1 NAS MADE.
THE LON RESISTANCE IN THE PERIPHERAL SUNDLE CAUSED THIS METHCD TO FAIL.
IT WAS THEN ASSUMED THAT FAILED FUEL (CR A CONOLOME? ATE OF PARTICLES) EXISTED AT THE PERIPHERY.
THECORETC0KONTHEFOLLONfSG SHAPE:
CENTRAL SUNDLES (115) 4 FEET OF FAILED FTcL BELOU THE U?PER END FITTING ( FAC <=3 SED)
REMAINING 2UNDLES 2 FEET OF FAIL 2D rucu acLON THE U?oSR END FITTING a19128
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G. A. MEYER APRIL 10, 1979 PAGE 3 THE GENERAL SHAPE AND RECOMMENDATION OF A FCUR FOOT HEIGHT NAS OSTAINED FRCM REFERENCE 1.
A TRIAL AND' ERROR APPRCACH NAS USED.
THE VOID FRACTION OF THE PACKED BED NAS VARIED AND A CORE a? CALCULATED.
THE FI.'!AL RESULT WAS THAT FOR THE A30VE CCNFIGUBATION i CORE AP = 14 PSI NAS CSTAINED 6
FOR A CORE FLON OF 13.1 x.10 LEM/HR.
THE FLON IN THE CENT.UL 6
BUNDLES (61) NAS.058 x 10 L3M/HR AND IN THE CUTER 3UNDLES 6
.082 x 10 L3M/HR.
THIS WAS FOR A PACKED 3ED !!EIGHT OF FCUR FEET
'AT THE CENTER 61 BUNDLES AND TWO. FEET CN'THE REMAINDER OF THE CCRE.
A VOID OF 60% WAS USED WHICH COMPARED WELL NITH THE 505 RECOM'4E.'DED IN REFERENCE 1.
NO FURTHER ATTE1 PTS WERE MADE TO MATCH PRESENTLY ASSUMED CCRE CONDITICNS -
6 AP
- 16.0 PSI, CORE FLON s 14.10 L3M/HR.
VARICUS ASSUMPTIONS CA.'
3E MADE CONCERNING THE GECMETRY AND MAKEUP CF THE FAILED FUEL WHICH IS ASSUMED TO RESa!3LE A PACKED BED.
WHAT IS IMPCRTANT'IS THAT:
1)
CORE CONDITICNS COULD 3E APPROXIMATED WITH THE PACKED BED ASSUMPTICN, 2)
FAILED FUEL (CR A HICH RESISTANCE EXISTS ACROSS THE CCRE).
TIIE FUEL AT THE PERIPHERY COULD 3E UNDAMAGED NITH A LAYER OF PARTICULATES 3ENEATH THE CORE SUPPCRT PLATE ALT!!CUGH IT SEDIS UNLIKELY TI!AT Tile MATERIAL NCULD BE THAT NON-
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G. A. MEYER APRIL 10, 1979 PAGE 4 i
f FURTiiER ! ORE, IF THE FAILURE MCDE OF THE CORE DESCRISED IN REFERENCE 1 IS ASSUMED, THEN IT APPEARS THAT THE THEEliCCCUPLES CCULD 33 SURRCUNDED BY UO.
THIS 'fCULD EXPLAIN THEIR HIGH READINGS.
THE EFFECT OF C0 3
2 SURRCUNDING THE THER"CCCUPLE ?.' ELL ?!AS LESCRIBED IN REFERENCE 3.
PJH/sgh QA:
THE MET!!ODS ? RESENTED ILUIE BEEN REVIE'. FED FOR APPLICA3ILITY AND THE CALCULATIONS SPOT-CC: J. H. JONES
. CHECKED FCR ACCURACY AND A. 3. JACKSON CONSISTENCY.
THE METiiCD IS
- J. C. MOXLEY DEEMED APPROPRIATE FOR THIS D. V. DE.'!ARS PARTICULAR APPLICATION.
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a R. A. KING D. C. SCHLUDER3 ERG G. S.-CLEVINGER v33130
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