Abstract: A radiation shielding method and a device, and a method of processing a structure, in which a first radiation-shielded region (A1) is provided by disposing a first radiation-shielding device (100) outside a nuclear reactor vessel (41), a neutron flux detector (77) is moved into the radiation-shielded region (A1) through a conduit tube (65) by moving a thimble tube (68) from the nuclear reactor vessel (41), and an inspection/repair work of the nuclear reactor vessel (41) is then performed, so that an amount of radiation delivered to a worker can be easily and sufficiently reduced.

Abstract: A clearance increasing jig of a heat transfer tube, includes: a jig main body inserted into a clearance between adjacent heat transfer tubes; an inflow hole provided in the jig main body and configured to allow a fluid to flow into the jig main body; and an increasing unit provided in the jig main body and configured to increase the clearance as the fluid flows into the jig main body.

Abstract: A clearance increasing jig of a heat transfer tube, includes: a jig main body inserted into a clearance between adjacent heat transfer tubes; an inflow hole provided in the jig main body and configured to allow a fluid to flow into the jig main body; and an increasing unit provided in the jig main body and configured to increase the clearance as the fluid flows into the jig main body.

Abstract: A radiation shielding method and a device, and a method of processing a structure, in which a first radiation-shielded region (A1) is provided by disposing a first radiation-shielding device (100) outside a nuclear reactor vessel (41), a neutron flux detector (77) is moved into the radiation-shielded region (A1) through a conduit tube (65) by moving a thimble tube (68) from the nuclear reactor vessel (41), and an inspection/repair work of the nuclear reactor vessel (41) is then performed, so that an amount of radiation delivered to a worker can be easily and sufficiently reduced.

Abstract: To include a step of installing a hollow container (1) at a predetermined portion of an object to be shielded (100), a step of feeding fluid into the container (1) via a hose (22) by a fluid feeding unit (2), and a step of transporting and filling a granular shielding material into the container (1) via the hose (22) by supplying the shielding material to the fluid by a shielding-material supply unit (3). With this arrangement, because a shielding material is fed into the container (1) together with the fluid and filled therein at a remote place from the object to be shielded (100), a worker does not need to approach the object to be shielded (100). Further, because a shielding effect is improved by the granular shielding material, an amount of radiation to the worker can be reduced easily and sufficiently.

Abstract: To include a step of installing a hollow container (1) at a predetermined portion of an object to be shielded (100), a step of feeding fluid into the container (1) via a hose (22) by a fluid feeding unit (2), and a step of transporting and filling a granular shielding material into the container (1) via the hose (22) by supplying the shielding material to the fluid by a shielding-material supply unit (3). With this arrangement, because a shielding material is fed into the container (1) together with the fluid and filled therein at a remote place from the object to be shielded (100), a worker does not need to approach the object to be shielded (100). Further, because a shielding effect is improved by the granular shielding material, an amount of radiation to the worker can be reduced easily and sufficiently.