METHOD FOR MANAGING RADIOACTIVE SUBSTANCE STORAGE CONTAINER

To provide a method for managing a radioactive substance storage container that can accurately estimate a gas temperature in a lid space, and by using this, can accurately estimate the amount of gas leaking from the lid space.SOLUTION: A method for managing a radioactive substance storage container 1 performs gas filling operations to supply gas to a lid space 6 to maintain a positive pressure state in the lid space 6. In the current gas filling operations, a gas temperature in the lid space 6 is calculated by using the amount of gas supplied to the lid space 6 measured by a flowmeter 15 and gas pressures in the lid space 6 before the supply of gas and after the supply of gas measured by a manometer 11, and the amount of a gas substance in the lid space 6 before the supply of gas is calculated by using the gas temperature in the lid space 6 and the gas pressure in the lid space 6 before the supply of gas. The amount of gas leaking from the lid space 6 is calculated from the difference between the amount of the gas substance in the lid space 6 after the supply of gas in the previous gas filling operations and the amount of the gas substance in the lid space 6 before the supply of gas in the current gas filling operations.SELECTED DRAWING: Figure 2 【課題】蓋部空間のガス温度を精度よく推定し、これを用いて蓋部空間のガス漏えい量を精度よく推定することができる放射性物質貯蔵容器の管理方法を提供する。【解決手段】放射性物質貯蔵容器１の管理方法は、蓋部空間６の正圧状態を維持するため、蓋部空間６へガスを供給するガス充填作業を行う。今回のガス充填作業時に、流量計１５で測定された蓋部空間６へのガス供給量と圧力計１１で測定されたガス供給前及びガス供給後の蓋部空間６のガス圧力を用いて、蓋部空間６のガス温度を算出し、蓋部空間６のガス温度とガス供給前の蓋部空間６のガス圧力を用いて、ガス供給前の蓋部空間６のガス物質量を算出する。そして、前回のガス充填作業時におけるガス供給後の蓋部空間６のガス物質量と今回のガス充填作業時におけるガス供給前の蓋部空間６のガス物質量との差により、蓋部空間６のガス漏えい量を算出する。【選択図】図２