الفهرس 
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Abstract
The thermal hydraulic calculations of research reactor like the material testing reactor MTR are among the most important indications to judge the performance of research reactor during normal and accidental conditions. A new code is designed and utilized engineering equation solver EES software to understand the performance of MTR during normal operation and during many situations of accidents. The main effort in this study is directed towards studying the performance of the MTR during normal and accidental conditions. The EES program provide the pressure drop, the velocity distribution inside the core, amount of flow rate inside every channel of the reactor, the coolant temperature distribution inside the core, the fuel temperature distribution. Also, the program considers many limiting phenomena to evaluate thermal margins in case of natural and forced convection such as onset of nucleate boiling ONB, pulsed boiling PB, Burn-Out, the flow redistribution phenomenon and critical heat flux CHF to ensure that the chosen MTR operates in safe condition.
The predicted results include the important hydraulic parameters in steady-state and transient state for example pressure DROP inside the fuel elements, heat transfer coefficient for the average and hot channel and the temperature distribution for the fuel plates are presented and discussed.
The present predictions indicates that the calculation by using EES program in steady state for the chosen MTR operates without any problems and the reactor achieve the required safety goals and all the safety margins are achieved as the designer required.
For the chosen MTR the prediction from EES program showed the followings: the maximum coolent temperature for heated channels reached to 65.57c the maximum wall temperature reached 99.35c, while the maximum clad temperature reached 103.7c.
The results indicate that the minimum onset of nucleate boiling ONB margin reached equal 3.342, the value of minimum burn-out margin BO margin reached 4.025, the minimum safety margin RB reached 4.56 while the value of minimum safety marginDNBR reached 4.648.
The output results from EES program are compared with the previous codes like CAUDVAP, TERMIC, CONVEC and also compared with experimental wirk, good agreement between the present prediction and previous ones are observed.