Monitoring for one or more parameters of nuclear reactor core comprises use of sub-assembly of detectors to measure neutron flow

摘要

Monitoring, employing detectors (8) with probes (9) inserted into the fuel assemblies (2) of the reactor core (1), uses a sub-assembly selected from the detectors and equivalent to at least 15% of the fuel assemblies to measure the neutron flow in the core at predetermined time intervals. Monitoring, employing detectors (8) with probes (9) inserted into the fuel assemblies (2) of the reactor core (1), uses a sub-assembly selected from the detectors and equivalent to at least 15% of the fuel assemblies to measure the neutron flow in the core at predetermined time intervals. A code for calculating the neutron flow and the measurements provided by the detectors are used to give an instant distribution of the neutron flow in the reactor core, from which a core operating parameter can be calculated, with an alarm set off if the parameter is outside a set range. An Independent claim is also included for a surveillance apparatus for use in the above process.