Postirradiation examination of "JOYO" MK-II structural materials irradiation rig (Fab. No. PRS040); Nondestructive testing on irradiation rig and its compartments

not registered; not registered; not registered; not registered

Postirradiation Examination (PIE) of "JOYO" MK-II Structural Materials Irradiation Rig (SMIR : Fab. No. PRS040) has been performed. The rig was irradiated during the 1st cycle of 100MW reactor power, and had the neutron fluence of about 1.19 10n/cm (E0.1 MeV) The purpose of the present PIE in Fuel Monitoring Facility (FMF) are listed as following: (1)Verification of validity of designing of the integrity and investigation on irradiation behavior of "SMIR". (2)Evaluation of the propriety of the "SMIR" designing from a viewpoint of the disassembling and sodium removal. (3)The handling of small test pieces and shipment of the test pieces to Materials Testing in MMF. The result were summarized as follows : (1)Neutron fluence of "SMIR" was relctivey low, so that the integrity and rig elements were kept normelly during irradiation period. (2)The residual sodium in the rig was scarcely found, and the rig was easily disassembled by remote handling. (3)The remote handling of small test pieces was easily carried out. A standard schedule for "SMIR" PIE performance in FMF has been established.