ML20030A569
| ML20030A569 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 01/31/1976 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML20030A568 | List: |
| References | |
| NUDOCS 8101100080 | |
| Download: ML20030A569 (3) | |
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I, Revised Heatup Analysis for ENC Mixed-Oxide G Fuel I
in the Big Rock Point Plant Using Reduced Fuel Thermal Conductivity i
January 1976 t
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1 INTRODUCTION In response to a request from D. L. Ziemann, USNRC, to R. B. Sewell, Consumers Power Company, dated January 8,1976, the heatup analysis for mixed-oxide G fuel (submitted as Appendix B on July 25,1975) has been adjusted to include a reduced mixed-oxide thermal conductivity expression. Specifically, the re-quest stated:
"The UOp thermal conductivity expression in GAPEX is not acceptable for application T,o mixed-oxide fuels. The ex-pression should be reduced by 15 for each 1 w/o P902 in the mixed-oxide fuels (new and existing) in the Big Rock Point Reactor."
This report presents the results of the revised heatup analysis.
NATURE OF THE REVISION Ihe initial Pp02 concentrction in the mixed-oxide rods of G fuel is 5.h5 w/o.
The thermal conductivity table generated by GAPEX for the July 25, 1975 submittal was multiplied by 0.9h55 and input on cards to GAPEX using the appropriate thermal conductivity input option. The version of the code,
-GAPEX/DEC7hA, was unchanged, and is the same version used in the prior G fuel cnalysis.
The HUXY code also uses a thermal conductivity expression when it calculates the behavior of peak-clad temperature with time. Although the NRC request mentioned only GAPEX, the HUXY expression was also multiplied by 0.9455 to be consistent with the GAPEX calculation. As there is no means of inputting thermal conductivity to HUXY, a modification was made to the TKUO2 subroutine of HUXY9/JUL75A-(the version used in the prior analysis) to multiply the cal-culated value of the thermal conductivity by 0.9455 RESULTS An exposure spectrum was considered for the worst break (Design Basis Accident).
The results for the July 1975 analysis are given in Table 1 under the " Full k" column, and the results of this analysis are given under the "0 9h55 k" column.
Without changing the MAPLHGR from the prior analysis, the change in peak-clad temperature resulting from the d.ecrease in thermal conductivity ranges from
+7.5*F at zero exposure to +33 F at 28,000 mwd /MTM.
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TAELE 1 MAPLHGR Verstu r.xposure for Mixed-oxide G Fuel Exposure Full k o.9455 k A MAPLHGR MVd/ MIN MAPHLGR. kW/Ft MAPLHGR. kW/Ft kW/Ft o
6.381 6.380
-0.001 2,250 6.810 6.790
-0.020 5,000 6.788 6.765
-0.023 11,000 6.896 6.862
-0.034
.15,000 7.035 6.975
-0.060 21,000 7 023 6.953
-0.070 28,000 7.154 7.058
-0.096 i
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NRC DISTRIBUTION FOR pal:T SO DOCICET MATFRI AL i
(FEMPORARY FORM) i CONTROL NO:._ _1206__
FILE:
F ROM: CONSUMERS P/a'ER CO.
DATE OF DOC D ATE R EC'O LTR TWX RPT Orl!E!;
JACKSON, MICil R B SEWELL 2-4-76 2-7-76 XXXX TO:
OnlG C P OTilER ~
SENT liric PDR._____.XXNZ D 12 ZIEMANN 1 SICNED 39 SENT LOCAL PDR CLASS UNCLASS PROP lNFO INPUT NO CYS REC'D DOCKE F NO:
50-155 40 DESCRIPTION:
ENCLOSURES:
RE OUR LTR 1-8-76.....LTR TRANS TIIE FOLLOW-REVISED llEATUP ANALYSIS FOR ENC MIXED-ING.
OXIDE G FUEL AT BIG ROCK POINT PLANT DATED JAN 1976...........
DO NOT T: :.W~T'
. PLANT NAME:
BIG ROCK POINT r?:mo 2 7fi_
N SATETY FOR ACTION /INiiliMATION ASS 1CHED AD ASSlGECD ORAL:Cl! CIIIEr N ERANCll ClllEP 2 d. b M k _
PROJECT MA!!ACER
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6 6 N E.S LIC ASST.
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Nb W/(lhYSACRS INTISII~ihL DISTIiiUUTION G TILLS #
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