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The control rod drop analysis is very important for safety analysis. A mathematical model of the control rod for the ETRR-2 reactor is presented. A computer program by the Engineering Equation Solver has been developed for investigation of the impact force and the final dropping velocity of the rod. Also, buckling deformation stresses have been simulated using commercial software, ABAQUS/CAE release 6.14-5. This paper describes the theoretical results required to obtain the von Mises stress at maximum impact force during the control rod drop. The control rod velocity after the rod reached the reactor core bottom has been predicted which reached up to 3.8 ms?1 after a drop time equal to 0.41 s at the end of the reactor core height. The results showed that the maximum and minimum von Mises stresses are 90 MPa and 6.345 MPa at maximum and minimum impact force of 6625 N and 755.73 N, respectively.

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Clean areas nowadays are advanced technology solutions with very high standard and criteria applied on air quality level. Egyptian Radioisotopes Production facility (RPF) is a facility that requires clean area to produce technetium (Tc 99m ) isotope for medical purposes. The air cleanliness inside area is dependent on the air quality of supplied air, contaminant and pollutant sources, dedicated ventilation system in addition to rigorous precautions to sterilize space of the area and commitment to follow standard recommendations. Two main standard classes are available in production area, A and C according to ISO 14644-1. Our paper deals with class C in which isotope is produced and some tests are conducted to know particle counts in that area in addition to prediction of these counts by computer simulation Contam-CFD0 program, which predicts transient particles count behavior which compared with standard WHO values and measurements for validation. Biological tests are also implemented to monitor sterility of area to confirm cleanliness and validity for processing medical radioisotope. High efficiency particulate air filters with class H14 are dedicated for the clean area and equipped with pressure drop manometer for replacement in case of blockage. Simulation program is also used to predict particles concentration in case of filter contamination.

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