DIN IEC/IEEE 63113:2026-01

It is necessary to monitor spent fuel pools during normal operations in order to: detect a potential loss of residual heat removal from the pool, detect high pool levels that risk pool overflow, confirm the pool contains sufficient water to shield operators from the high activity of fission products contained in the spent fuel, and to ensure safety analysis assumptions are met concerning pool water hold-up of fission products in the event of a fuel handling accident. This international standard provides criteria for spent fuel pool instrumentation for nuclear power generating stations and other nuclear facilities. The standard applies to water filled spent fuel pools where the water fill is necessary to prevent a release of fission products that exceeds allowed operational limits. In order to give an overall view of the requirements for spent fuel pool monitoring this standard establishes criteria for the performance, design, qualification, display, and quality assurance of instrument channels for monitoring spent fuel pool conditions during both operational states and accident conditions (including design extension conditions) at nuclear facilities. This standard applies only to instrumentation for monitoring the condition of the spent fuel pool as a fission product barrier, namely pool level, pool temperature, and area radiation. It does not apply to control systems that are related to the spent fuel pool such as: the pool cooling systems, isolation valve control, crane instrumentation and control, or refuelling machine instrumentation and control.