BS IEC 61468 pdf download Nuclear power plants — In-core instrumentation — Characteristics and test methods of self-powered neutron detectors 1 Scope and object This International Standard applies to in-core neutron detectors and instrumentation whichare designed for purposes important to safety: protection，control and information. lt isrestricted to characteristics and test methods for self-powered neutron detectors(SPNDs).Self-powered neutron detectors can be used...