METHOD FOR MEASURING GAS PRESSURE IN GAS COLLECTOR OF NUCLEAR-REACTOR FUEL ELEMENT

摘要

FIELD: nuclear reactors. ^ SUBSTANCE: proposed method involves filling two additional cavities of which one communicates with fuel-element gas collector with definite gas. Each cavity is provided with heater accommodating central tube. These central tubes are heated simultaneously by means of heating elements accommodated in first and second cavities, cooled down, and temperature difference between central tube with heating element in first and second additional cavities and coolant flowing over these cavities is measured. Rate of simultaneous cooling of coaxially disposed central tubes with heating elements of first and second additional cavities as well as thermal conductivity of gas mixture in additional spaces are determined. Volume fraction of evolved gaseous fission products in first additional cavity including heat conductivity as function of volume fraction of gases is measured, and value obtained is used to find gas pressure within first additional cavity and within fuel-element gas collector. ^ EFFECT: enhanced measurement accuracy. ^ 2 cl, 2 dwg