核电厂.对安全重要的仪表系统.堆芯仪表:自供电中子探测器的特性和试验方法

[中文适用范围]： 该文件适用于旨在用于核反应堆安全相关系统（保护、仪表和控制）的堆芯中子探测器，即自供电中子探测器（SPND）。本文件包含SPND的特性及测试方法。在本文件中，还考虑了主要误差源及其最小化的可能性。自供电中子探测器可用于测量核反应堆中的中子注量率及相关参数。最常用于上述应用的是具有铑发射极的探测器。本文件考虑了动态特性、发射极烧损、身份及其他影响探测器运行特性的因素。除了铑发射极SPND外，本文件还考虑了其他材料发射极的SPND及其主要特性。本文件包含关于各种可能应用中选择SPND类型和特性的要求、建议和说明。本文件关于SPND的内容使用了IEC 61513和IEC 60568的基本要求，并在符合IAEA安全指南的前提下，补充了更具体的规定。 [外文原描述]： IEC 61468:2021 applies to in-core neutron detectors, viz. self-powered neutron detectors (SPNDs), which are intended for application in systems important for nuclear reactor safety: protection, instrumentation and control. This document contains SPND characteristics and test methods. In this document, the main sources of errors, and the possibilities for their minimization are also considered. This document contains requirements, recommendations and instructions concerning selection of SPND type and characteristics for various possible applications. This document about SPNDs uses the basic requirements of IEC 61513 and IEC 60568 and complements them with more specific provisions in compliance with IAEA Safety Guides. This second edition cancels and replaces the first edition, published in 2000, and its Amendment 1, published in 2003. This edition includes the following significant technical changes with respect to the previous edition: a. Title modified. b. Justify the requirements for SPND characteristics in terms of influencing factors. c. Align the terminology with the current state of the regulatory framework.