Abstract
The embrittlement of steels by neutron irradiation is one of the most important problems in the construction and operation of reactors. An in-pile test rig was constructed by the authors in JRR-2 for the irradiation test of structural steels.
In the present report, the authors describe the test rig, experimental conditions available with the rig in vertical experimental tube of JRR-2, and the results of the irradiation tests, including the post-irradiation V-notch Charpy tests on the A 302 B steel, its welded portion and an aluminium killed steel.
