IEC 60951-2:2009

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 Sampling assembly
      4.3.1 General
      4.3.2 Measurement technique requirements
      4.3.3 Requirements on filters and collecting devices
      4.3.4 Requirements on sampling circuit and materials
5 Functional Testing
  5.1 General
  5.2 Reference sources
  5.3 Performance characteristics: Response to other
      radioactive gases or particles
      5.3.1 Requirements
      5.3.2 Test method
  5.4 Air circuit performance test
      5.4.1 General
      5.4.2 Monitor sampling efficiency
      5.4.3 Susceptibility to gas or particles retention
      5.4.4 Relative error of the volume and flow rate
            measurement
      5.4.5 Flow-rate stability
      5.4.6 Effect of filter pressure drop
      5.4.7 Effect of power supply voltage on the flow
            rate
      5.4.8 Effect of power supply frequency on the flow
            rate

IEC 60951-2:2009 provides general guidance on the design principles and performance criteria for equipment for continuous off-line monitoring of radioactivity in gaseous effluents and ventilation air used 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.