Abstract
Abstract The 400MWt district-heating reactor (DHR400), which is one type of small modular reactor (SMR), is designed to solve district-heating problem in northern China, and its reactor characteristics and parameters are described in the paper. Reactor core inventory, accident source term and dose consequence of DHR400 is calculated in the event of fuel handling accident and core damage accident. The ORIGEN2 code developed by Oak Ridge National Laboratory is used to calculate the core inventory for an operating period of five years before refueling. Based on regulations for environmental radiation protection of China and regulatory guide of NRC, the accident scenario and source term assumption of design based accident and beyond design based accident are discussed. The accidental releases of radioactive material from reactor is calculated and evaluated based on the ARCON96 program sponsored by the NRC. In this paper, an overall systematic analysis method, which includes key aspects in the calculation, such as hazard assessment, source term estimation and timing, dose assessment and so on, is proposed to determine emergency planning zone (EPZ) of DHR400. The result shows that 114m could be used as the recommended boundary of EPZ of DHR400 in one specific DHR400 site.
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