PROTECTION METHOD OF REACTOR CORE OF WATER-COOLED POWER REACTOR AS PER LOCAL PARAMETERS USING READINGS OF IN-CORE NEUTRON DETECTORS Russian patent published in 2011 - IPC G21C17/04 

FIELD: power industry.

SUBSTANCE: active elements are uniformly distributed in the core volume. Active elements are tuned selectively and delays of in-core detectors are eliminated. Readings of the nearest in-core detectors belonging to various safety channels are pre-bound to each fuel assembly. Energy release in the chosen fuel assembly is determined by using statistical weights prepared in advance, which are determined as per "influence function" and depending on the distance between fuel assembly and position of fuel assembly in the core. Ratios of energy release in the measured and non-measured fuel assemblies are maintained during the whole specified time interval. Continuous monitoring of flow changes in the core is performed by means of on-line monitoring of the core on the basis of changes in readings of neutron sensitive detectors. There used are readings of detectors of thermal properties by using the confirmation of the signal on exceedance by local energy release of the most stressed fuel element and by minimum margin until crisis of heat exchange of the allowable limit from various channels of protection system by using "majority" principle in order to exclude false actuations.

EFFECT: invention allows shaping discrete protection signals on exceedance by linear energy release of maximum stressed fuel elements and by minimum margin of allowable limits until crisis of heat exchange in the core.