Time filter

Source Type

Abudeif A.M.,Sohag University | Abdel Moneim A.A.,Sohag University | Farrag A.F.,Research Institute of Nuclear Power Plants
Annals of Nuclear Energy

Due to increasing demand of electrical energy and freshwater in Egypt, it is safe to assume that the decision makers will turn to nuclear power as the feasible alternative for energy. However, as time goes by, fewer sites will be available and suitable for nuclear power plant development. Site selection is a key phase of the siting process of a nuclear plant and may significantly affect the safety and cost of the facility during its entire life cycle. The siting of nuclear power plants is one of multi-criteria problems, which makes it complex. Many interrelated factors affect the process. Six constraints and twenty-two factors corresponding to safety, environment and socio-economy were considered in the siting study presented in this paper. Multi-Criteria Decision Analysis was applied during the selection of nuclear power plants site using GIS software. Three spatial decision making models were applied in this paper during site selection stage. The binary overlay (Boolean logic) with Low Risk approach in which the logical OR operator is used to determine the candidate areas. All constraints were represented in binary maps, combined and a masking layer was created to eliminate the lands considered as constraints in Arc GIS Software. The 22 factors were represented in normalized maps after unifying all of them to 0-1 score scales based on the philosophy of suitability criteria (factors) using the Weighted Linear Combination (WLC) method. The relative scores and weight of factors which were used in the maps conducted by pairwise comparison were fed into Expert choice software that runs the Analytic Hierarchy Process. Final composite map of potential site priorities were represented by several polygons produced in MCDA add-in as an open source tool in Arc GIS 10.1. Four sites, all located along the North western and the Red Sea coasts were chosen as Candidate sites after eliminating the lowest scoring sites The Analytic Hierarchy Process (AHP) was used to select a suitable site by pairwise comparison and by calculating eigenvectors using Expert Choice software. The sites were ranked to determine the most desirable site. The El Dabaa site was found to be most suitable, followed by the East El Negila site on the Mediterranean Sea. © 2014 Elsevier Ltd. All rights reserved. Source

Eissa M.,Research Institute of Nuclear Power Plants | Aly M.N.,Alexandria University | Badawi A.,Alexandria University
International Journal of Nuclear Energy Science and Technology

Multi-group diffusion depletion 3D code TRITON was used to calculate the power density profile for a 2775 MW PWR core. TRITON was run for different control rod axial positions at full power: (a) all the control rods are outside the core and (b) control rod group D position at 220 cm with length 213 cm in core. Depending on the axial power density shape, a suitable function was chosen to fit the power density. This function was used to evaluate the temperature distribution in the core. A MATLAB script was used to predict the temperature distribution. The maximum temperatures for the coolant, clad and fuel centre were determined for each control rod position. The maximum temperature locations, when all the control rods were outside the core, were found to exist in assembly (F6), and the vicinity of the centre of the core in assemblies that are burnable absorber free. When control rod group D was inserted in the core in steps, a significant number of high temperatures were found on the same axial position or became closer to the centre of the core. Copyright © 2015 Inderscience Enterprises Ltd. Source

Verezemskii V.G.,Research Institute of Nuclear Power Plants
Power Technology and Engineering

Use of the probabilistic approach to evaluation of the safety and longevity of the metal in the studs of the No. 2 generating set at the Sayano-Shushenskaya HPP is examined. © 2014 Springer Science + Business Media New York. Source

Eissa M.,Research Institute of Nuclear Power Plants | Naguib M.,Alexandria University | Badawi A.,Alexandria University
Annals of Nuclear Energy

This study investigates the best radial positions for the monitoring detectors inside the reactor core, which provides close monitoring to enhance reactor safety. These positions depend on flux distortion due to reactivity change induced by accidental drop of a control rod into the core, as one of the causes of the reactivity change. Thermal neutron flux shape after each control rod group and rod cluster insertion is estimated to show the maximum distortion in neutron flux shape. The study aims to define the maximum distortion case by means of correlation coefficients corresponding to the data that were calculated using the three dimensional diffusion depletion code TRITON. Correlation coefficient and reactivity were determined for each rod cluster control (RCC) assembly. For each case, the change in shape of the thermal flux was determined in case of full insertion or accidental drop of one of the rod cluster control (RCC) assemblies in the reactor core at full power. © 2015 Elsevier Ltd. All rights reserved. Source

Hussein A.S.,Naif Arab University for Security science | Hussein A.S.,Research Institute of Nuclear Power Plants

Radon (222Rn) is a radioactive gas that occurs naturally when uranium in soil and rock breaks down. Long-term exposure to 222Rn increases the risk of lung cancer. The principal objective of this work was to determine the 222Rn activity concentration in an indoor air environment at the El-Dabaa site proposed for a nuclear power plant project in Egypt using the track etch technique with LR115 detectors. The annual average indoor 222Rn activity concentration in apartment buildings varies from 24 to 77 Bq.m-3, with a mean value of 54 Bq.m-3. The annual effective dose received by residents of the studied area was estimated to be 0.41 mSv. The annual estimated effective dose is less than the recommended action level by ICRP (3-10 mSv.y-1). The results from this work provide a radiological assessment program and update the background of the natural radioactivity map at the El-Dabaa site. © EDP Sciences, 2014. Source

Discover hidden collaborations