IEC 61468:2021适用于堆芯中子探测器，即自供电中子探测器（SPND），旨在应用于对核反应堆安全重要的系统:保护、仪表和控制。本文件包含SPND特性和测试方法。在本文件中，还考虑了误差的主要来源及其最小化的可能性。本文件包含关于各种可能应用的SPND类型和特性选择的要求、建议和说明。 这份关于SPNDs的文件使用了IEC 61513和IEC 60568的基本要求，并根据IAEA安全指南补充了更具体的规定。 第二版取消并取代了2000年出版的第一版及其2003年出版的修正案1。与上一版相比，此版本包括以下重大技术变更: a.标题已修改。 b.根据影响因素证明SPND特性要求的合理性。 c.使术语与监管框架的当前状态保持一致。

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.