Method and installation for monitoring the core of a nuclear reactor

Abstract

The invention relates to a method and installation for monitoring the core of a nuclear reactor, and the nuclear reactor comprises a movable core-internal instrumentation system (4) whole instrumentation tube (3) enters into a nuclear reactor core (1) and a fuel instrument assembly (2') at the reactor core height so as to form a measurement channel. Each movable probe fixed at one end of each displacement cable allows measuring the flux of each neutron along the whole height of the reactor core in each measurement channel. The reactor core is monitored and measured by comparing the critical parameter of at least one reactor core with the predetermined threshold value. If the critical parameter reaches the threshold value or the value determined based on the physical value detected from the reactor core (1) departed from the value calculated based on a module, a movable probe is guide into at least one measurement channel (3) of the reactor core (1); and the movable probe moves along the height of the reactor core (1) so as to complete the flux measurement of one group of neutrons, thereby calculating the critical parameter according to the neutron flux measurement completed by the movable probe.

Description

technical field [0001] The invention relates to a method and a device for monitoring a nuclear reactor and in particular the core of a pressurized water cooled nuclear reactor. Background technique [0002] Nuclear reactors, for example pressurized water cooled nuclear reactors, comprise a core comprising generally prismatic fuel assemblies juxtaposed with their longitudinal axis in a vertical direction, ie along the height of the core. [0003] During the operation of nuclear reactors, it is always necessary to ensure that the reactor works perfectly and complies with the general safety conditions set by regulations and standards. [0004] In particular, it is necessary to determine whether the generation and volume distribution of the neutron flux, and whether the volume distribution of the released power in the core is satisfactory, ie corresponds to the conditions for normal and good operation of the core. [0005] To do this, the core operating parameters of the nuclea...

AI Technical Summary

Problems solved by technology

In addition, the in-core metering system using the movable probe must be able to be used periodically in any case, which also incurs maintenance costs associated with the movable metering system

[0025] The removable probe in-core instrumentation system allows very accurate neutron flux measurements, can be deployed very quickly and provides great flexibility, as yet there has been no continuous monitoring of the core of a nuclear reactor

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