International Electrotechnical Commission

Radiation protection instrumentation – Installed dose rate meters, warning assemblies and monitors – X and gamma radiation of energy between 50 keV and 7 MeV - Edition 3.0
 N 60532

Annotation

Scope and object

This International Standard applies to installed dose rate meters, warning assemblies and monitors that are used to prevent or mitigate a minor radioactive release, or minor degradation of fuel, within the nuclear power plants /nuclear facility design basis, and to warn personnel or to ensure their safety during or following events that involve or result in release of radioactivity in the nuclear power plants (NPP) /nuclear facility (NF), or risk of radiation exposure. This equipment is typically classified as category "A" or "B" or "C" or "not classified" in IEC 61226.

It covers equipment intended to isotropically measure air kerma, ambient dose equivalent or other exposure quantities due to X or gamma radiation of energy between 50 keV and 7 MeV. The equipment is intended primarily for the purpose of radiological protection, and may play an auxiliary or indirect role in the achievement or maintenance of nuclear plant safety.

Instruments measuring over a more limited energy range fall within the scope of this standard provided they cover at least the range of 80 keV to 1,5 MeV.

Assemblies of this type are commonly defined as area radiation monitors. They are normally employed to determine continuously the radiological situation in working areas in which the radiation field may change with time, for example nuclear power plants, particle accelerators, high active laboratories, fuel reprocessing plants, and to provide alarms when the radiation field goes outside predetermined limits. They are also employed to act in safety related protection systems, such as personnel access control systems which allow access to areas which can be subject to radiation fields.