ML19259B148
| ML19259B148 | |
| Person / Time | |
|---|---|
| Site: | Framatome ANP Richland |
| Issue date: | 12/13/1978 |
| From: | Nechodom W SIEMENS POWER CORP. (FORMERLY SIEMENS NUCLEAR POWER |
| To: | Mcdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| NUDOCS 7901160376 | |
| Download: ML19259B148 (3) | |
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HESEA{lIAND TECHNOLOGY CENTER 2955 Geor.ae Washing:on Way. Richland. Washington 99352 PHONE- (509) 943 7100
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Mr. C. E. Mcdonald, Chief
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Transportation Branch Division of Materials and Fuel D-Cycle Facility Licensing
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U. S. Nuclear Regulatory Commission Washington, D. C. 20555 j "33 00d-
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Docket 70-1257
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JN-52, ADD-5 4)
JN-52, ADD-4
Dear Mr. Mcdonald :
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Currently the Model 51032-1 shipping container is licensed for transport of twenty-four (24) different Exxon Nuclear Company fuel types (see Reference 1).
We have been requested to transport two new types of fuel assemblics quite similar to our XN-Type XVI assemblies. These fuel assemblies differ in fuel rod array size and enrichment from the XN-Type XVI, but fall within the envelope of design parameters of the fuel type previously analyzed and licensed. A comparison of the XN-Type XXV and XN-Type XXVI with the previously reviewed XN-Type XVI assemblies is given below:
TABLE I XN-Type XVI XN-Type XXV XN-Type XXVI Fuel Rod Array 15 x 15 14 x 14 14 x 14 Active Fuel Rods 204 179 179 Inert Rods 21 17 17 Average Wt.%
U 3.06 3.2 3.45 Nominal Fuel Pellet Diameter
.3565
.3565
.3565 Nominal Clad O.D.
.425
.424
.426 Nominal Clad Thickness
.0275
.030
.031 Clad Material Zr-4 Zr-4 Zr-4 Nominal Rod Pitch
.563
.556
. 5563 Fuel Assembly Loading, Kg U (max.) 450.0 383.0 b, -383. 0)
Fuel Assembly, k, 1.393 1.399 1.414 As can be seen by comparison of the fuel assembly parameters, the two new bundle types differ mainly from the XN-Type XVI in fuel rod array size and the enrichment.
The N.004 and.015 Ak/k for the XN-Types XXV and XXVI, respectively, are primarily due to the higher fissile enrichment of these types.
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AN AFFILIATE OF EXXON CORPORATION
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~,ftr. C. E. Mcdonald (USNRC) December 13, 1978 The smaller bundle size of the XN-Type XXV and XN-Type XXVI will produce lower single bundle and array k gg's than the previously analyzed XN-Type XVI. To demon-strate this, the one-dimensional diffusion theory code HFN was used to calculate the reactivity for cylinders of equal cross-sectional area to one and four bundles for both the XN-Type XVI and XN-Type XXVI assemblies. The results are as follows:
XN-Type XVI XN-Type XXVI No. of Bundles Radius (in.)
k Radius (in.)
k Ak/k eff egg 1
4.76
.839 4.39
.815
.029 4
9.53 1.138 8.78 1.126
.011 As shown in Reference 3, the reactivities of the XN-Type XVI fuel assemblies packaged in Model 51032-1 containers is 0.880 +.010 and 0.938 +.005 under normal and accident conditions, respectively.
The s.015 Ak/k due to the higher enrichment of the XN-Type XXVI fuel assembly is compensated for by the decreased bundle k due to the smaller bundle size as demonstrated above. ConsideringtheoffsettingOffects of higher enrichment and bundle size, it is concluded that the XN-Type XXV and XN-Type XXVI fuel assemblies will not affect the safety of the Model 51032-1 shipping container.
These packages are therefore in compliance with the appropriate provisions of 10CFR71.
Exxon Nuclear has also been requested to transport another fuel type similar to our XN-Type XVI assemblies. These fuel assemblies differ only slightly in enrichment, rod size, and fuel assembly loading. A comparison of the XN-Type XXVII and the previously analyzed XN-Type XVI assemblies is given below:
TABLE II XN-Type XVI XN-Type XXVII Fuel Rod Array 15 x 15 15 x 15 Active Fuel Rods 204 204 Inert Rods 21 21 Average Wt.%
U 3.06 3.1 Nominal Fuel Pellet Diameter
.3565
.3565 Nominal Clad 0.D.
.425
.424 Nominal Clad Thickness
.0275
.030 Clad Material Zr-4 Zr-4 Nominal Rod Pitch
.563
.563 Fuel Assembly Loading, Kg U (max.)
450 437.0 Fuel Assembly, k, 1.393 1.398 As can be seen by cs iparison of the two fuel types, the differences in enrich-ment and clad size account for only an s.004 Ak/k increase in the fuel assembly k,.
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"Mr. C. E. Mcdonald (USNRC) December 13, 1978 Again from Reference 3, the reactivities of the Type XVI fuel assemblies packaged in Model 51032-1 container is 0.880 +.010 and 0.938 +.005 under noimal and accident conditions, respectively. Considering the.004 Ak/k change in the burdie k, and the decreased fuel assembly loading in Kg's U, it can be concluded that the XN-Type XXVII will not affect the safety of the Model 51032-1 shipping container.- These packages are therefore in compliance with the appropriate provisions of 10CFR71.
We have further been requested to transport another fuel type similar to our XN-Type XIII assemblies. These fuel assemblies differ slightly in enrichment, fuel rod dimensions, assembly loading, and poison content.
A comparison of the XN-Type XXVIII and the previously analyzed XN-Type XIII assemblics is given below.
TABLE'III XN-Type XIII XN-Type XXVIII Fuel Rod Array 8x8 8x8 Poison Content (Gd 0 )
23 w/o 1.15 2.50 No. of Rod335 4/64 5/64 Average Wt.%
U 2.65 2.78 Nominal Fuel Pellet Diameter
.4195
.4039 Nominal Clad 0.D.
.5015
.4839 Nominal Clad Thickness
.034
.035 Clad bbterial Zr-2 Zr-2 Nominal Rod Pitch
.642
.640 Fuel Assembly Loading, Kg U (max.)
200 176.0 Fuel Assembly, k,
1.351 1.372 As shown in Reference 4, the reactivities of the XN-Type XIII fuel assemblies packaged in the Model S1032-1 containers are.811 +.006 and.643 +.010 under normal and accident conditions of transport, respectively. As a result of the relatively low values of k nothaveaneff0b,onthesafetyoftheModelit is concluded that the.02 ok/k change in the ass 51032-1 shipping containers if loaded with XN-Type XXVIII assemblics rather than the XN-Type XIII assemblies. These packages, therefore, are in compliance with the appropriate provisions of 10CFR71.
As a result of the above, a revision to Certificate of Compliance No. 6581 is requested authorizing delivery of Model 51032-1 packages containing XN-Type XXV, XN-Type XXVI, XN-Type XXVII, and XN-Type XXVIII fuel to a carrier for transport as Fissile Class I shipments.
If you have any questions concerning this application, please contact Mr. Richard Schutt (509-943-8426).
Sincerely, Q
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W. S. Nechodom, Manager Licensing and Compliance WSN:RHS:gf