Boiling water reactor, and method of purifying water inside a reactor well

摘要

The present invention aims to reduce the total exposed dose of the workers inside a reactor well during the annual inspection of a nuclear reactor. In order to achieve the above-mentioned aim, the present invention provides a boiling water reactor, comprising a first piping for pouring water of a reactor vessel to a reactor well located above the reactor vessel via a pump and a cooler, a second piping for pouring water of a spent fuel storage pool to the reactor well via a pump and a filter/demineralizer, and a third piping for pouring the water of the spent fuel storage pool to the spent fuel storage pool via the pump and the filter/demineralizer.