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RERTR
Reduced Enrichment for Research and Test Reactors
Nuclear Engineering Division at Argonne
U.S. Department of Energy

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Foreign Research Reactor Spent Nuclear Fuel

ANL/RERTR/TM-26

APPENDIX A
MTR MODEL MASS INVENTORY SENSITIVITY

This appendix examines the sensitivity of MTR-type fuel assemblies to the number of fuel plates in the assembly as well as the fuel element specifications for the fuel, clad and coolant. An examination of many MTR-type fuel assemblies shows that the ratio of the coolant channel thickness to the fuel meat thickness, times the number of fuel plates, is nearly a constant. This constant is also proportional to the H/U-235 atom ratio which can be used to characterize the neutron spectrum in MTR-type fuel assemblies.

Figure A1 shows the H/U-235 atom ratio as a function of the U-235 mass. The upper curve are for 19-plate (0.51mm fuel, 0.38mm clad, 2.95mm coolant) elements and the lower curve are for 23-plate (0.51mm fuel, 0.38mm clad, 2.19mm coolant) elements. Most all MTR-type fuel assemblies as a function of the fuel element specifications are within the range (6%) of the average H/U-235 ratio.

 

Figure A1. MTR Fuel Assembly Model Sensitivity

Tables A1-A3 show the mass inventory results for MTR fuel assembly types with 300g U-235 and 93, 45 and 19.75% U-235 enrichment. The difference between the upper and lower bound results indicate only small differences in the isotopic masses as a function of fuel element specification.

2016 RERTR Meeting

The 2016 International RERTR Meeting (RERTR-2016) will take place in Belgium. Stay tuned for further details.

2015 RERTR Meeting

The 2015 International RERTR Meeting (RERTR-2015) took place in Seoul, Korea on Oct. 11-14, 2015.
For more information visit RERTR-2015.

ANL/RERTR/TM-26


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Last modified on July 29, 2008 11:34 +0200