31. U . S . nuclear plants are protected by containment buildings with 4-foot-thick concrete walls lined with steel. 32. "The purpose of the test is to ensure that the containment building can maintain its integrity, " he said. 33. In modern Russian plants, there is a " core catching device " in the bottom of the containment building . 34. It possesses a modest containment building , and the ECCS systems, though not completely to Western standards, are reasonably comprehensive. 35. Almost certainly the hydrogen was formed inside the reactor vessel with the hydrogen subsequently vented into the containment building . 36. Although a calandria-based core is cheaper to build, its size increases the cost for standard features like the containment building . 37. Containment buildings are designed for the orderly release of pressure without releasing radionuclides, through a pressure release valve and filters.38. Both a working PORV with quench tank and separately the containment building with sump provided two layers of passive safety. 39. The containment building itself is typically an airtight steel structure enclosing the reactor normally sealed off from the outside atmosphere. 40. The spill was confined to the plant's containment building , and regulators have said there is no risk to the public.
