Method and apparatus for detecting gas leakage from radioactive material sealed container
AssigneeCentral Research Institute of Electric Power Industry
InventorHirofumi Takeda
Life of this patent
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Abstract
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.
Claims15
A method for detecting gas leakage from a radioactive material sealed container, adapted to detect leakage of inactive gas from a metallic sealed container of the radioactive material sealed container that includes:
- the metallic sealed container configured to store and seal spent fuel and the inactive gas;
- and a non-sealed concrete-made storage container having a shielding function and configured to store the metallic sealed container, the method comprising:
- measuring a temperature at a top portion of the metallic sealed container, a temperature at a bottom portion of a lid portion of the 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;
- also measuring an inner temperature of the lid portion of the concrete-made storage container;
- and
- estimating presence of leakage of the inactive gas by comparing the temperature at the top portion of the metallic sealed container with the inner temperature of the lid portion of the concrete-made storage container or comparing the inner temperature of the lid portion of the concrete-made storage container with the temperature at the bottom portion of the lid portion of the concrete-made storage container or the temperature of the member existing between the bottom portion of the lid portion and the top portion of the metallic sealed container.
An apparatus for detecting gas leakage from a radioactive material sealed container, adapted to detect leakage of inactive gas from a metallic sealed container of the radioactive material sealed container that includes:
- the metallic sealed container configured to store and seal spent fuel and the inactive gas;
- and a non-sealed concrete-made storage container having a shielding function and configured to store the metallic sealed container, the apparatus comprising:
- a first temperature sensor configured to measure a temperature at a top portion of the metallic sealed container, a temperature at a bottom portion of a lid portion of the 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;
- a second temperature sensor configured to measure an inner temperature of the lid portion of the concrete-made storage container;
- and
- a gas leakage estimation unit configured to estimate presence of leakage of the inactive gas by comparing a temperature measured by the first temperature sensor with a temperature measured by the second temperature sensor.
Dependencies are inferred from the claim text.