the air-tight building, which houses a nuclear reactor and its pressurizer, reactor coolant pumps, steam generator, and other equipment or piping that might otherwise release fission products to the atmosphere in the event of an accident, a pressure resistant containing system entirely surrounding a nuclear reactor and designed to prevent the release, even under the conditions of a reactor accident, of unacceptable quantities of radioactive material beyond a controlled zone, tuumareaktorit ja selle abiseadmeid ümbritsev õhukindel ja rõhku taluv hoone, mis takistab avarii korral radioaktiivse materjali pääsu atmosfääri