Central Research Institute of Electric Power Industry

Hirofumi Takeda

In a canister horizontally installed and housed inside a concrete silo, at least two temperatures out of a temperature Tat a canister bottom portion to be one end portion in a lateral direction in a horizontally-installed attitude, a temperature Tat a canister side surface lower portion located below a horizontal plane passing through a center of the canister, a temperature Tat a canister lid portion to be the other end portion in the lateral direction, and a temperature Tat a canister side surface upper portion located above the horizontal plane passing through the center of the canister are monitored, and occurrence of leakage of an inert gas inside the canister is detected when there is a change in a temperature difference between the at least two temperatures.

Gas leakage detection method and gas leakage detection apparatus in horizontally-installed canister

A cooling air amount adjustment device of a concrete cask is provided. The device includes at least one of an air outlet port opening level adjustment mechanism and an air inlet port opening level adjustment mechanism which are adapted to automatically perform adjustment to reduce a flow rate of a cooling air when a temperature of the cooling air at an air outlet port is lower than an adjustment reference temperature, and adjustment to increase the flow rate of the cooling air so as to restore the flow rate of the cooling air when the temperature of the cooling air at the air outlet port is higher than the adjustment reference temperature.

Cooling air amount adjustment device of concrete cask and concrete cask

A method for detecting gas leakage from a radioactive material sealed container includes measuring a temperature at a bottom portion of a metallic sealed container. A feeding air temperature of external air passing between the metallic sealed container and a concrete-made storage container is also measured. Presence of leakage of inactive gas is determined by comparing the temperatures or by utilizing a physical amount calculated by using the temperatures.

Method and apparatus for detecting gas leakage from radioactive material sealed container

A method for detecting gas leakage from a radioactive material sealed container includes measuring a temperature at a top portion of a metallic sealed container, a temperature at a bottom portion of a lid portion of a concrete-made storage container facing the top portion of the metallic sealed container, or a temperature of a member existing between the bottom portion of the lid portion and the top portion of the metallic sealed container. An inner temperature of the lid portion of the concrete-made storage container is also measured. Presence of leakage of inactive gas is estimated by comparing the temperatures.

Growing community of inventors

Chiba, Japan

Hirofumi Takeda