In-Containment refueling water storage tank (IRWST) with water washing function

The utility model relates to an in-Containment refueling water storage tank (IRWST) with a water washing function. The in-Containment refueling water storage tank is formed by a conventional built-in refueling water storage tank and a water washing pool that are arranged in parallel, wherein the conventional built-in refueling water storage tank is communicated with the water washing pool through a water injecting pipeline positioned at the bottom and an overflowing pipeline positioned below the upper liquid level; an air inlet pipeline communicated with the atmosphere of the containment vessel and an air discharging pipeline communicated with a filtering and discharging system of the containment vessel are arranged inside the water washing pool. The refueling water storage tank adds the water washing function while guaranteeing the function of the conventional built-in refueling water storage tank; when the filtering and discharging operation is executed by a containment, high-temperature and high-pressure gas inside the containment is washed through the water washing pool, the concentration of water vapor and the gas temperature are lowered, the content of radioactive aerosol carried by gas is reduced, the service life of the filtering and discharging system of the containment is prolonged, filter efficiency is improved, failure probability of the filtering and discharging system is lowered, radioactive release in the environment is reduced, and considerable economic benefit and social benefit can be brought.