الفهرس 
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Abstract
Freshwater is a fundamental necessity for life and sustainable development; yet it is a limited resource. Desalination of the seawater has been introduced as an effective solution for the freshwater scarcity problem since the mid-20th century. In recent years, because of limited fossil energy resources and the high increase in fuel prices, the option of combining nuclear power with seawater desalination has been explored to tackle water shortage problem.The objective of this thesis is to develop a computer package to simulate an integrated nuclear distillation system. This simulator is intended to serve as an educational tool to study in particular the MED seawater distillation technology coupling to Pressurized Water Reactor (PWR) nuclear reactor for electricity production and seawater distillation. The main purpose of this work is to Study the transient behavior of MED system in case of normal operation as well as in case of change of the operating parameters and Studying the mutual effects between the nuclear power plant and the coupled desalination plant under different operating regimes and scenarios, and hence demonstrates the feasibility of the safe production of potable water.In addition, the past experience as well as the current developments, plans and feasibility studies in this field will be highlighted.Co-generation for electric power and seawater desalination using a nuclear reactor requires a careful consideration of how the desalination process is coupled to the power source safely, especially for those thermal desalination processes in which exchange of heat is required. The main safety concern is the prevention of radioactivity from migrating from the nuclear reactor to the desalination plant, even under accident conditions. This is achieved using suitable design features which make use of multiple barriers and pressure differentials to block the transport of radioactive materials to the distillation plant.The simulation of the nuclear desalination is considered by simulation of a typical seawater low temperature-horizontal tube multiple effect distillation process (MED) in which sea water is preheated in the final condenser then fed to all effects in parallel. Coupled with a 1000 MWe Pressurized Water Reactor (PWR) power plant through an intermediate loop.Advanced Process Simulation Software (APROS) version 5.04 was used to simulate the primary and the secondary circuits of PWR at steady state conditions.The distillation systems components are not provided by APROS, so an External Model technique is used. The External Model tool is designed to use a DLL contain a Dynamic mathematical model for each component of MED process compiled by Visual.The validation of the simulation model for the steady state and transient conditions is carried out as observed in the operating MED plant, producing 600 m3/day of distilled water located in northern Sinai, Al-Arish, Egypt.Data comparison with the Al-Arish operating MED plant, the simulation gives the results at the designed steady state conditions. It is found from this results that the maximum deviation between the simulator and the present operating plant results ranged from 2 to 8 %.For the dynamic response of the system, a scenario of 20% step reduction of the seawater feed flow rate is considered from 1 to 40 minutes. The results show that the maximum deviation between the simulated results and plant data is less than 10 %.