| 摘要 |
PROBLEM TO BE SOLVED: To prevent an accident in which a coolant becomes contaminated water in a nuclear reactor having a hole that is formed on its bottom due to melt-down, flows through the hole, and mixes with groundwater.SOLUTION: Instead of water, a liquid having a melting point higher than room temperature is used as a coolant. Flowing contaminated coolant solidifies in an outflow port and underground soil to block the outflow port. Thus, the outflow of the contaminated coolant into the underground soil is prevented and, furthermore, mixing with groundwater is prevented. The examples of the coolant include a metal such as lead, tin, or bismuth, and an organic material such as paraffin that has a low viscosity in the liquid state, is stable for radiation, and, as a guide, has a melting point of 20-30°C and a boiling point of 100-150°C. |
