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根据某氚回收系统的结构,对该系统的安全性进行了分析;同时运用事故树的方法对系统可能产生的泄漏概率也进行了分析。结果表明:系统故障造成泄漏的概率是1.1×10-3,人为失误造成泄漏的概率为7.2×10-3,均在安全范围之内,但人为失误造成泄漏的概率远大于系统故障造成的泄漏概率。最大可信事故是由操作系统氚废物解吸室的破裂或人员误操作所造成的,此时被处理的氚全部释放出来。最大可信事故条件下,事故氚的排放源项为5.84TBq,估算出环境中最大个人有效剂量为1.24×10-3mSv;80km范围内集体最大有效剂量为15.33人.mSv。
According to the structure of a tritium recovery system, the security of the system is analyzed. At the same time, the probability of leakage of the system may also be analyzed using the method of accident tree. The results show that the probability of leakage caused by system failure is 1.1 × 10-3, and the probability of human error caused by leakage is 7.2 × 10-3, all within the safe range, but the probability of leakage caused by human error is far greater than that caused by system failure Probability. The largest credible accident is caused by the rupture or misoperation of the operating system tritium waste desorption chamber, when the tritium being treated is completely released. Under the maximum credible accident condition, the source item of tritium emission was 5.84TBq, and the maximum effective dose for the environment was estimated to be 1.24 × 10-3mSv. The maximum effective dose for collective within 80km was 15.33mSv.