ML20141N247
ML20141N247 | |
Person / Time | |
---|---|
Site: | 07105942 |
Issue date: | 09/10/1985 |
From: | Marotta C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
To: | Odegaarden R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
Shared Package | |
ML20141N246 | List: |
References | |
FOIA-85-791 NUDOCS 8603060003 | |
Download: ML20141N247 (5) | |
Text
__ _ _ _-- _ .__ . _ . . _ _ _ _.
SEP 101985 FCTC:CM 71-5942 f
MEMORANDUM FOR: Richard H. Odegaarden. FCTC. MSS FROM: Charles R. Marotta. FCTC. MSS .
l
SUBJECT:
COMPARISON OF GE AND NRC CRITICALITY CALCULATIONS I
- OF THE MODEL 700 PACKAGE CONTAINING 10 MTR FUEL !
ASSEPSLIES AND 20 MTR FUEL ASSEMBLIES GE calculated a keff of 0.9236+0.0075 for 10 MTR fuel assemblies in the flodel 700 (June 7.1985) and aleff of 0.88725+0.00446 for 20 MTR fuel -
, assemblies in'the Model 700 (August 7. 1985).
He have asked GE to resolve this discrepancy (September 4. 1985). In ,
anticipation of this resolution. I am reporting NRC's homogeneous calculations l for the cases (enclosed input and output).
I a. for 10 MTR assemblies: keff = 0.889,+0.006 ,,
Since there is a 100% fissile mass increase between a. and b., we can assume 1/4 of 100% or 25% increase in keff if the system were a spherical geometry; since we have stacked 10 assemblies on top of another 10. one must take 1/3 of 25% or 8.3% is expected on the change of keff or:
=7.4%$ calc.versus8.3%(expected).
0 '.
Charles R. Marotta
Enclosure:
As stated Distribution: / enc 1 Docket File CRMarotta FCTC R/F l MSS R/F w/o enci 8603060003 e60108 PDR FOIA AUDIN85-791 PDR A.
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5 56148E=07 No. nF INITIAL GENFRATIONS AVFRAGF bi pFR CENT SKIPPED K. EFFECTIVE 95 PER CENT 99 PtN CENT DEVIATinN COMFinFNCF INTFRVAL CONFIDFNCE INTERVAL CUN[IDEnCE INTER 3 028A905 + UR = 0.0060m 0.AAP95 Tn 0289513 0.A7669 TO 0.90121 0.87081 10 0,907 4 0288953 + UR = 0.00614 0.AA116 Tn 0289569 n.87720 70 0.90186 0.87104 TO 0.908 5 0289066 + 04 = 0.'0061A 0.84450 Tn 0.'896A1 0.87834 70 0.90299 o.A7217 TO o.9n9 6 0.'A9048 + OR = 020062i n.Ma4pt Tn 0289075 0.87794 70 0.90302 0.87 107 10 109 7 0.'H8996 + UD = 020063A 0.AA1hn Yn 0.'89632 n.87724 70 0.90268 n.87087 TU o.909 8 0.'89080 + OR = 0.'05647 0.8841i 70 0289722 0.87795 TU o.90364 o.87153 TU o.910, 9 0.'88993 + OR = 0 .' o n 6 4 A 0.aa149 Yn 02n9642 0.87697 70 0.90290 0.A7048 To o.909-10 OIhA991 + OR = 020060s o.4811n To c.'84o5't o.87669 70 0.90312 0.87009 Tu o.9n9-11 0.'80099 + OR = 0.'00n73
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NriDilLE CSASP WTLt RF CALIED TTHF nF day 18210213 DATF A5I215
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GE 700 70 HTR FA 173GRnUPGMTH a 8 1 T NFHOMME 0 film 0 0
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