Abstract
In order to evaluate off-site radiation exposure during normal operation of the High Temperature Engineering Test Reactor (HTTR), some amounts of fission products are assumed to be released from the fuel particles with defect of coating layers. In the evaluation, 1% of coated fuel particles is conservatively assumed to be failed in the HTTR. The release paths of fission products from the core to the stack are divided into two patterns, namely continuous release and periodical release. The annual offsite radiation exposure from the HTTR is 0.77 μSv/y in effective dose equivalent. This value is sufficiently lower than the reference dose of 50 μSv/y in normal operation.
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