A containment of a nuclear power plant has a pressure chamber, a condensation chamber, and a substantially vertically running condensation tube. The grating has a matrix of quadrangular opening tapering from front to rear in the shape of a truncated pyramid. The ore processor bed has a frame supporting several rotating elements each separately driven to provide independent rotation rate and direction from the other. A record medium, which can be read by the personal computer, contains a program for judging what communication state the system is in, a cable communication state, a wireless communication state, or a non-communication state, and restricting processing the personal computer can perform in accordance with the result of the judgment.