The Un-instrumented Fuel Irradiation Subassembly (UNIS) is an irradiation rig for irradiating test fuel pins, and grouped into four types (type A, B, C and D) according to test purpose.
The type-B UNIS (UNIS-B) is used primarily for successive irradiation testing of test fuel pins. It is possible to perform an interim inspection during the irradiation, evaluate the integrity of a selected sample fuel pin, and then reassemble the UNIS-B and reinstall it into the core.
In addition, as it is possible to set irradiation conditions for each of the 6 compartments independently, a parametric irradiation test can be performed using one UNIS-B.
Furthermore, it is possible to irradiate a test fuel pin that has never been irradiated by using a capsule, and utilization for development of an advanced fuel is possible. |
