The Assessment of Radiation Zone Determination in RDE for Radiation Workers (P M Udiyania), A Hamzah, H Adrial, S Kuntjoro, I Husnayani, M Budi Setiawan

Abstract. Experimental Power Reactor (RDE) is a power reactor with High Temperature Gas cooled Reactor (HTGR).
The safety justification of the RDE design is that radiation safety can be guaranteed which guarantees the safety of
radiation workers and the community around the RDE site. To ensure the safety of workers and the community and the
justification that RDE design meets safety criteria, a study of the zoning of the radiation area in the reactor is needed. The
assessment is done based on HTR-10 parameters that types and power are similar to RDE. The research was conducted
using computer simulation methods using ORIGEN2.1 and MCNP computer programs. Based on the Regulation of
BAPETEN No.4 of 2013, concerning "Protection and Safety of Radiation in the Use of Nuclear Power", article 26 of the
Work Area is divided into 2 namely Control areas and Supervision area. The zoning of the work area for radiation
workers is determined based on the dosage amount calculated from the calculation of radiation sources, doses and
radiation shields designed. The division of work area is determined based on the layout of the reactor building which is
designed based on the RDE concept design. Based on the RDE concept design, the reactor building is divided into 4
levels, namely: 1). -12.70 m level; 2). Level ± 0.00 m; 3). Level + 12.70 m; and 4). Level +25.40 m. The results of the
radiation dose calculation in RDE and the layout of the RDE design are used to determine the zoning area for radiation
workers at each level area. Zoning is estimated in accordance with the rules of the BAPETEN regulatory body. Actions
that must be taken for each zoning are also carried out.