Radiation shielding analysis for conceptual design of reactor coolant system decontamination equipment of Kori Unit 1

In this study, radiation shielding analysis was performed on ISOCS and MicroShield® computational program for the filter which primarily removes thecrud particles after chemical decontamination of the reactor coolant system of Kori Unit.1. In this study, the radiation shielding analysis was performed on the filter which is one of thedecontamination equipment components of the Kori unit 1 reactor coolant system. The total nuclide inventories of the Kori Unit 1 reactor coolant system are ⁵⁸Co 58 4.2703×10¹¹ Bq, ⁶⁰Co 3.4385×10¹² Bq and ⁶⁵Zn 3.2748×10¹¹ Bq. The minimum shield thickness of lead for filters meeting the design criteria of shielding material 2.50E-02 mSv/h when calculated with the MicroShield® computer program is 21.05 cm.