IEC 60951-4:2009

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Design principles
  4.1 General
  4.2 Basic requirements related to functions
  4.3 Range of measurement
  4.4 In-line detectors mechanical features
      4.4.1 General requirements
      4.4.2 Pressure-containing parts
      4.4.3 Materials
      4.4.4 Verification of material processing
5 Functional testing
  5.1 General
  5.2 Environmental performance test
      5.2.1 Stability of performances with variation of
            ambient and stream conditions

IEC 60951-4:2009 provides general guidance on the design principles and performance criteria for equipment for continuous in-line or on-line monitoring of radioactivity in process stream in nuclear power plants for accident and post-accident conditions. General requirements for technical characteristics, test procedures, radiation characteristics, electrical, mechanical, and environmental characteristics are given in IEC 60951-1. These requirements are applicable in this part unless otherwise stated. The main technical changes with regard to the previous edition are as follows:
- clarify the definitions;
- up-date the references to new standards published since the first edition;
- update the units of radiation.

This publication is to be read in conjunction with IEC 60951-1:2009.