IN CORE INSTRUMENT FOR NUCLEAR REACTOR REDUCIBLE RADIOACTIVE WASTE

摘要

The present invention is induced to solve a foresaid problem and relates to an in-core measuring instrument for reducing radioactive wastes capable of reducing the amount of high level wastes and minimizing detection errors. The in-core measuring instrument for reducing radioactive wastes according to the present invention comprises an in-core side configuration unit installed at the inside of a nuclear reactor; an out-core side configuration unit installed at the outside of the nuclear reactor; and a reducer (110) for connecting the in-core side configuration unit and the out-core side configuration unit mutually. The in-core side configuration unit comprises: an in-core side external protection pipe (150); a center pipe (130) arranged in the in-core side external protection pipe (150) with a gap; a plurality of neutron detectors (131) installed around the center pipe (130) inside the in-core external protection pipe (150); two thermocouple cables (133) covered with different sheaths; a filler cable (134) for filling a plurality of spaces; and the detector (132) for signal compensation. The out-core side configuration unit comprises: a center filler wire (120) located at the center of a shaft; the plurality of neutron detectors (131) installed around the center filler wire (120); the thermocouple cable (133); and the detector (132) for signal compensation. A reducer (110) is formed with a circular cone shape in which a plurality of cable penetration grooves (114) are formed on a slope circumference surface (119). The in-core side configuration unit is arranged at a large mirror surface (117) of the reducer (110). The out-core side configuration unit is arranged at a small mirror surface (118) of the reducer (110). The neutron detectors (131) of the in-core side configuration unit, the thermocouple cable (133), and the detector (132) for the signal compensation are withdrawn to the out-core side through the cable penetration groove.