秦山300MW核电站^（210）Po-Be启动源的设计和安全分析

DESIGN AND SAFETY ANALYSIS OF ^(210)Po-Be START-UP SOURCE FOR 300 MW QINSHAN NUCLEAR POWER PLANT

基于同位素中子源设计的一般原则，对秦山３００ＭＷ核电站压水难所需￣（２１０）Ｐｏ－Ｂｅ启动源进行了精心设计。源壳的物理尺寸兼顾了中子产额和机械强度，能承受因￣（２１０）Ｐｏ的α衰变，Ｂｅ的（ｎ，２ｎ）、（ｎ，α）、（γ，ｎ）核反应产生的Ｈｅ气及环境温度引起源壳内压的增加。原型试验表明原型源的安全性能级别可达到ＩＳＯ／Ｅ６６５４５。按本设计制作的￣（２１０）ＰＯ－Ｂｅ中子源能满足压水堆安全启动的要求，并确保源在堆内操作期间（≈４５０ｄ）的安全性和可靠性。

Based on the general design principle of radioisotope neutron source,the elaborate design of ￣(210)Po-Be star-up source for 300MW Qinshan Nuclear Power Plant is performed. Both neutron yields andmechanical strength have been taken into consideration in deriving the physical dimensions of sourcecapcule. The internal pressure built-up caused by the decay of ￣(210)Po, the nuclear reaction:(n, 2n),(n,α),(n,γ)and(γ,n)of beryllium undergoing the neutron irradiation and the ambient temperaturecan be endured by capsule. The prototype testing indicate that the classification of prototype source performance is up to ISO/E66545.The designed ￣(210)po-Be source can satisfy the requests of PWR start-upand ensure the safety and reliability of sources during the operation(≈450d)at reactor.