the reactor is hosted in a five-floor concrete-steel building. the walls have a thickness of 60 cm. in its lowest, partially underground part is located the 1.7–1.8 m thick steel and concrete pressure suppression drywell. the structure is able to withstand an earthquake. in case of a plane crash, however, the building could be damaged. the reactor would nevertheless remain intact due to the five 30–50 cm thick insoles and the massive drywell.