Method of monitoring an electricity generating station equipped with a nuclear reactor

Claim 1

Method of monitoring an electricity generating station equipped with a nuclear reactor, involving gathering quantitative or qualitative information, called "parameters", that can be defined, each time, by a unique numerical information, relating to the operation and to the state of the components of the power station, comparing these parameters with reference data corresponding to normal operation, and signalling the differences existing between the parameters and the reference data, the state of the reactor being defined at each moment by one situation selected from an assembly of predetermined situations corresponding to the various phases of operation or shutdown of the reactor, depending on the level of the power emitted by the core, the physical parameters of the primary fluid and their variation with time or the needs for action relating to the protection or safeguard of the reactor, wherein (a) the type of operation of the reactor is defined at each moment by linking it to one of the predetermined situations; (b) the useful parameters for monitoring the power station are grouped into sub-assemblies called "functions", each corresponding to the assembly of the parameters to be monitored when monitoring the performance of a particular and indispensable task in a power station for normal control or for performing an emergency action; (c) the qualitative state of each of the parameters of each of the functions involved is determined according to a predetermined category describing its suitability for contributing to performing the function in the situation in question and representing a level of deterioration in relation to normal operation according to predetermined specifications; (d) the most unfavorable state allocated to at least one of the parameters of each of the functions in question is allocated to this function; (e) the overall qualitative state of the situation is determined as being the most unfavorable qualitative state allocated to at least one of the functions; and (f) the information relating to the overall qualitative state of the situation, to the qualitative state state of each of the functions and to any change of qualitative state in any one of these functions is displayed.