| http://www.w3.org/ns/prov#value | - In addition to this composition, devices requiring maintenance, such as pipes like the main steam pipe 215 led from the nuclear reactor pressure vessel 201, and the pressure containment vessel internal valves and the like are accommodated inside a guard pipe 407 extending from the dry well 231 portion to the dual-cylindrical structure to the exterior thereof, so that it becomes possible to perform
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