Estimation of HTTR fission products released from homogeneous and heterogeneous fuel configuration using MVP software

摘要

Burn-up simulation of High Temperature Engineering Test Reactor (HTTR) has been performed using MVP software. The purpose of this study is to estimate the fission products from the reactor fuel. The type of fuel was modeled as prismatic blocks containing 6% enrichment UO_2 pebbles coated with TRISO. The burn-up was calculated from 1,000 MWd/t to 35,000 MWd/t with 8 steps at a constant power of 30 MWth and the fuel configurations were either homogenous or heterogeneous. We only analyzed the xenon, iodine and cesium groups fission products. The result of each group for homogeneous was (9.361 ± 0.021)×10~(14) Bq, (2.7362 ± 0.0067)×10~(15) Bq and (9.781 ± 0.024)×10~(13) Bq while for heterogeneous was (1.0969 ± 0.0024)×10~(16) Bq, (3.3071 ± 0.0068)×10~(16) Bq and (1.1812 ± 0.0024)×10~(15) Bq respectively for ~(135)Xe, ~(135)I and ~(137)Cs. These results clearly showed that the heterogeneous configuration have higher activities than those of the homogeneous.