الفهرس 
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Abstract
Egypt Second Research Reactor (ETRR-2) core was modified to irradiate LEU (Low Enriched
Uranium) plates in two irradiation boxes for fission 99Mo production. The old core comprising
29 fuel elements and one Co Irradiation Device (CID) and the new core comprising 27 fuel
elements, CID, and two 99Mo production boxes. The in core irradiation has the advantage of
no special cooling or irradiation loop is required. The purpose of the present work is the
analysis of Reactivity Induced Accidents (RIA) for ETRR-2 core. The analysis was done to
evaluate the accidents from different point of view:
- Analysis of the new core for various Reactor Protection System (RPS) parameters
- Comparison between the two cores
- Analysis ofthe 99Mo production boxes
PARET computer code was employed to compute various parameters. Initiating events in RIA
involve various modes of reactivity insertion, namely, prompt critical condition (p=I$),
accidental ejection of partial and complete CID, uncontrolled withdrawal of a control rod
accident, and sudden cooling of the reactor core. The time histories of reactor power, energy
released, and the maximum fuel, clad and coolant temperatures of fuel elements and LEU
plates were calculated for each of these accidents. The results show that the maximum clad
temperatures remain well below the clad melting of both fuel and uranium plates during these
accidents. It is concluded that for the new core, the RIA with scram will not result in fuel or
uranium plate failure.