Abstract
The IFIN-HH VVR-S type Nuclear Research Reactor is currently in the decommissioning phase. During the operation period inside of the reactor building a workshop for mechanical processing of depleted uranium blocks was used. The purpose was containers manufacturing for biological shielding of Cs-137 and Co-60 sources. The dose rate and associated risk for workers performing clean-up and decontamination of the workshop was assessed using RESRAD Build 3.5 code. As a result of the workshop radiological characterization performed in 2007 it was revealed the presence of U-238 as dust particles embedded in the oil grease. The main risk for workers contamination was internal by aerosols inhalation as well as external by hand touching of the contaminated surfaces. The time for clean-up and decontamination operation was 2 weeks, and therefore the estimation was made for this period.
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