DETECTOR ASSEMBLY FOR REACTOR INTERNAL MONITORING SYSTEM Russian patent published in 1999 - IPC

FIELD: nuclear reactors. SUBSTANCE: oblong casing 1 of detector assembly is pressurized and filled with helium. Casing 1 houses directional- charge neutron detectors 16, 17 fixed in position on inner surface of U-shaped slab 33 by means of clamps 45; detector cables 21 are brought out to external surface of slab through depressions 34 in its side surface and fixed in position by means of clamps 46. Elongated tube 36 that passes all cables of detector assembly is connected to slab 33. Ends of temperature detectors made in the form of thermoelectric converters 24, 25 and level gages 29, 30 depending for their operation on heat- transfer principle are arranged in inner spaces of respective U- shaped locks 39, 40 which are filled with solder 43, 44. Hermetically sealed passage 4 connected to casing 1 by means of welded joints 15 is built up of bushing accommodating cylinders 10, 11 interconnected through hermetically sealed joint; cylinder slots receive detector cables 13 soldered therein. EFFECT: improved operating reliability and accuracy in measuring neutron flux, coolant temperature and level in reactor vessel. 20 cl, 8 dwg