低温核供热堆热网回路的辐射安全评价

RADIATION SAFETY ASSESSMENT OF THE HEATING SYSTEMLOOP OF A DISTRICT HEATING REACTOR

本文主要介绍低温核供热堆为防止放射性物质进入热网回路的安全措施，在正常和事故工况下热网回路水中的放射性水平及其对用户所受最大可能剂量的估计。结果表明，即使在发生概率极低的最严重事故条件下，热网回路水最大可能达到的放射性核素浓度也比天然水的本底浓度低１个量级，足以保证广大用户的安全。

The paper describes the safety measures used in a district heating reactor to pre-vent radioactive materials from entering into the heating loop, and the evaluation of radioac-tivity concentration in the water of the heating loop and the potential maximum dose to theresidents under normal and accidental conditions.The results show that even under the con-dition of extremely low probability accident , the radionuclide concentration in the water ofthe heating loop is one order of magnitude lower than the background concentration in natu-ral water, therefore , the safety of the residents can be assured.