Patent ID: 6236698
Filing Date: 2001-05-22
Classification: G21C,Y02E

Abstract:
A nuclear reactor instrumentation system, comprising:a plurality of in core nuclear instrumentation assemblies arranged in a gap between a number of fuel assemblies charged in a reactor core,said in core nuclear instrumentation assemblies each including a fixed type neutron detector assembly and a fixed type gamma thermometer assembly,wherein said fixed type neutron detector assembly comprises N fixed neutron detectors dispersively arranged in a core axial direction with a predetermined interval L, where N is an integer greater than and equal to four, andsaid fixed type gamma thermometer assembly comprises at least 2N-1 fixed type gamma ray heat detectors arranged in the core axial direction such that N of the at least 2N-1 fixed type gamma ray heat detectors are arranged at the same core axial position as the fixed type neutron detectors and a reminder N-1 of the fixed type gamnma ray heat detectors are arranged at an intermediate position in the core axial direction between said fixed type neutron detectors;a power range detector signal processing device operatively connected to said fixed type neutron detector assemblies through signal cables; anda gamma thermometer signal processing device operatively connected to said fixed type gamma thermometer assembly of the in core nuclear instrumentation assembly through a signal cable.