The whole nuclear power plant is very large, which is divided into supervised area and unregulated area. In general, radiation only occurs in some places in the nuclear reactor building and belongs to the controlled area. The annual dose received by employees is limited. If you enter a radioactive area, you must wear personal dosimeter strictly.
The unrestricted area is mainly the auxiliary part of nuclear power plant, such as maintenance and turbine building. There is basically no nuclear radiation in these departments. Nuclear power plants have strict requirements on the physical conditions of employees, and they will not be allowed to work in these places every time they receive radiation.