ML20141N248
| ML20141N248 | |
| Person / Time | |
|---|---|
| Site: | 07105942 |
| Issue date: | 09/18/1985 |
| 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 8603060004 | |
| Download: ML20141N248 (1) | |
Text
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FCTC:CRM 71-5942 MEMORAMOUM FOR: Richard H. Odegaarden, FCTC,PetSS FROM: Charles R. Marotta, FCTC, letSS
SUBJECT:
CRITICALITY REVIEW FOR MODEL 700 PACKAGE CONTAINING 20 FTR FUEL ASSEMBLIES
REFERENCES:
GE letter (with 3 attachtwnts) dated September 16, 1985; letters with attachments dated June 7 and August 7, 1985.
GE has analyzed the criticality of both the 10 and 20 t1TR-type assembly loadings in the Model 700 cask using KENO-IV, 27 neutron group cross-sections. An extremely conservative representation (September 16,1985) i of the Model 700 cask for the 10 MfP-type loading gave a Keff cf 0.924_+0.007.
This model assumed the lead too close to the stainless steel haskets at i the top, bottom, and sides of the cask. The KENO-IV georietry option was used to represent the discrete fuel-plate / water regions, basket regions and outer regions of the cask and water reflector. For the 20 assembly loading in the Model 700 (August 7,1985), generalized geometry option was used to represent the discrete plate / water regions, basket regions, and shield reflector region. This model represented a realistic 700 cask with contents.
It resulted in a keff of 0.887_+0.004 The staff has perfomed homogentzed calculations (KENO-IV,123-group) for the 10 and 20 assembly loadings. In both cases, a 3x3 array of MTR-type assembites within a steel basket (length of fuel array, 57.79 cms for 10 MTR-type assemblies; 115.57 cms for 20 f1TR-type assemblies) represented the required loading with each assembly fissionable content increased by 115 to account for 9 vs 10 and 18 vs 20 assemblies. Peter, Pb, water reflector region surrounded the above basketed loadings. The keff for 10 assemblies was calculated to be 0.889_+0.006; for 20 assemblies, the keff was 0.957_+0.007.
Approval is recommended in the area of criticality.
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Charles R. Marotta F R/F B603060004 060100 I o,me> PDR FOIA AUDIN05-791 PDR l l
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