Low-Level Radioactive Waste Disposal
In Japan, low-level radioactive waste (LLW) is classified into four categories (L1, L2, L3 and TRU waste) according to radioactivity concentration and its origin. Radioactive waste disposal is performed in phases by entities responsible for each category of waste.
JNFL accepts L2 type of LLW that is generated through operating domestic nuclear power plants which are owned by electric utility companies containing small amounts of mostly short-lived radioactivity, such as cobalt-60 (Half-life is about 5 years). Each category of LLW has a different disposal concept (See Diagram 1) . L2 type waste is disposed of in a concrete pit at the depth of ten meters or more at the JNFL site (See Diagram 2).
JNFL has been approved the operation of the disposal facilities with a total capacity of 80,000 m³ (400,000 of 200-liter waste drums).
Disposal Concept for radioactive waste in Japan
Concept for pit disposal at Rokkasho Low-Level Radioactive Waste Disposal Center