ML20141N247

Forwards Comparison of GE & NRC Criticality Calculations of Model 700 Package Containing 10 & 20 MTR Fuel Assemblies.Ge Requested to Resolve Calculation Discrepancies

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: IA-85-791, Confirms 850521 Discussion & Requests Addl Info Re Application for Certification of Model MH-1A Package.Encl Summary Identifies Deficiencies in Structural Analysis of Package That Must Be Addressed.W/O Encl ML20141N245 ML20141N247 ML20141N248 ML20141N249 ML20141N250 ML20141N251
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 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 b.

for 20 MTR assemblies: keff = 0.957+.,0.007.

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:

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6 0.'A9048 020062i n.Ma4pt Tn 0289075 0.87794 70 0.90302 0.87 107 10 109

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7 0.'H8996 020063A 0.AA1hn Yn 0.'89632 n.87724 70 0.90268 n.87087 TU o.909

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8 0.'89080

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