PROBLEM TO BE SOLVED: To provide a reactor auxiliary machine cooling facility capable of functioning just after a tsunami attack in addition to promoting diversification, independence, and locational dispersion of the reactor auxiliary machine cooling facility.SOLUTION: A reactor auxiliary machine cooling facility, which exchanges heat between cooling water and sea water and supplies the cooling water cooled by the sea water to a reactor auxiliary machine when a reactor has stopped, comprises: a first reactor auxiliary machine cooling system which includes a first sea water heat exchanger for exchanging heat between cooling water and sea water taken in at a first cooling water intake; and a second reactor auxiliary machine cooling system which, including a second sea water heat exchanger, stores sea water taken in at a second cooling water intake in a cooling water tank via a cooling water conduit and allows the second sea water heat exchanger to exchange heat between the stored sea water and cooling water. W
