控制棒驱动机构落棒失效率验证试验方案设计

在反应堆事故工况下，控制棒驱动机构（CRDM）必须能快速落棒，实现安全停堆。为保证反应堆的安全，核电站对CRDM的落棒失效率提出较高的要求。本文给出了关于CRDM落棒失效率验证试验方案的设计算法及基于二分法思想的求解方法，通过与GB 5080.5—85中所给方案进行对比分析，验证了其正确性。补充了GB 5080.5—85中关于成败型产品成功率验证试验方案中定数截尾试验方案的设计算法，对于任意给定的成功率、风险值及鉴别比，可在较短的时间内给出定数截尾试验方案。还可用于一般的成败型产品的成功率验证试验方案设计，满足对成败型产品越来越高的可靠性要求。

Design of Test Scheme for Failure Rate Verification of Control Rod Drive Mechanism Drop

In the event of the reactor accident, the control rod drive mechanism (CRDM) must be able to drop quickly and achieve the safe shutdown. In order to ensure the safety of the reactor, the nuclear power plant puts toward higher requirements on the failure rate of the CRDM. In this paper, the design algorithm of the test scheme for the failure rate of the CRDM and the corresponding solution method based on the dichotomy method were proposed. The correctness was verified by comparison with the scheme given in GB 5080.5-85. It supplements the design algorithm of the fixed-end censored test scheme for success rate verification test scheme of the success or failure type products in GB 5080.5-85. Based on any given success rate, risk value and discrimination ratio, it can give the censored test protocol in a short time. It also designs the success rate verification test scheme for general success or failure type products to meet the increasing reliability requirements for success or failure type products.