Abstracts and Available Papers Presented at the
2005 International RERTR Meeting
COMPLETION OF THE SAFETY ANALYSIS FOR THE WWR-M REACTOR IN UKRAINE TO ALLOW OPERATION USING LEU FUEL
Y. P. Mahlers and A. G.
Kiev Institute for Nuclear Research
Kiev 03680, Ukraine
The 10 MW, WWR-M research reactor of the Kiev Institute for Nuclear Research is going to be converted from HEU (36%) to LEU (19.75%) fuel. The reactor currently uses HEU (36%) WWR-M2 fuel assemblies (3 tubes, UO2-Al fuel meat with 1.1 gU/cm3 and 37.0 g 235U). Candidate LEU replacement fuel assemblies are: LEU WWR-M2 (3 tubes, UO2-Al fuel meat with 2.5 gU/cm3 and 41.7 g 235U). To qualify this LEU fuel for conversion of the WWR-M reactor in Ukraine, neutronic and thermal-hydraulic characteristics of LEU fuel equilibrium core and transition mixed core containing both LEU and HEU fuel were calculated. The following accidents were analyzed: spontaneous withdrawal of a control rod bank; incidental falling of a fuel assembly in a cell of the core; partial blockage of coolant flow across the core with accompanying partial melting of the core; full break of the first loop pipe with accompanying full melting of the core. The safety of fresh and depleted HEU and LEU fuel storage was analyzed. The revised safety documentation for LEU conversion of the WWR-M reactor has been reviewed and approved officially by the State Scientific Technical Center, as requested by the Ukrainian Nuclear Regulatory Committee.
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Dr. Jordi Roglans-Ribas
Technical Director, RERTR Department
Nuclear Engineering Division – 362
Argonne National Laboratory
9700 South Cass Avenue
Argonne, IL 60439
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