Research Institute of Nuclear Power Plants

Trnava, Slovakia

Research Institute of Nuclear Power Plants

Trnava, Slovakia
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Abudeif A.M.,Sohag University | Raef A.E.,Kansas State University | Abdel Moneim A.A.,Sohag University | Mohammed M.A.,Sohag University | Farrag A.F.,Research Institute of Nuclear Power Plants
Soil Dynamics and Earthquake Engineering | Year: 2017

Determination of the dynamic geotechnical properties and Vs30 of soil and rocks from seismic wave velocities serves as essential inputs for a foundation design cognizant of seismic site response and rock strength. This study evaluates a site which was suggested for a Nuclear Power Plant (NPP) in El-Dabaa area, north western coast of Egypt. On the near subsurface geology is made up of a thick succession of limestone overlain by a thin layer of soft soil. Assessment of geotechnical materials and Vs30 of the near sub-surface lithological layers are required for design of the foundation of critical structures like turbo-generator and reactor buildings. Interpretation of ninety one shallow P-waves and S-waves seismic refraction profiles distributed within the study area in conjunction with data of 76 boreholes were undertaken to delineate the dynamic properties of shallow soil for construction NPP. The velocity of the P- and S-waves were acquired and interpreted using SeisImager Software Package, then the results were used to build a velocity-depth model to estimate the depth to the bedrock and the thicknesses of overburden layers. This model was verified using boreholes data dissected the seismic profiles to improve the final velocity depth model. The depth to bedrock was determined from both shallow seismic refraction profiles and boreholes. Vs30, elastic moduli and dynamic geotechnical parameters were calculated and the site was classified as a National Earthquake Hazard Reduction Program (NEHRP) class “B”. The values of seismic velocities, the engineering consolidations, and the strength parameters showed that the bedrock in the study area is characterized by more competent rock quality. © 2017 Elsevier Ltd


Verezemskii V.G.,Research Institute of Nuclear Power Plants
Power Technology and Engineering | Year: 2014

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.


Eissa M.,Research Institute of Nuclear Power Plants | Naguib M.,Alexandria University | Badawi A.,Alexandria University
Annals of Nuclear Energy | Year: 2015

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.


Ibrahim S.M.A.,Al - Azhar University of Egypt | Attia S.I.,Research Institute of Nuclear Power Plants
International Journal of Nuclear Energy Science and Technology | Year: 2015

This study presents the effect of temperature, fouling factor and salinity of the condenser cooling seawater and adverse effect on the thermal performance of a nuclear power plant. These are the most important factors affecting the condenser performance. The study is carried out on a pressurised water reactor nuclear power plant. The results showed that a loss in the plant output power and thermal efficiency of up to 8.242% and 2.77%, respectively, can result from an increase in the condenser cooling seawater temperature by about 15-30°C, fouling factor of seawater and treated boiler feed water by about 0.00015-0.00035 and 0.00005-0.00015 m2 K/W, respectively, and salinity by about 0-100 g/kg. This paper investigates three real practical factors that have been proved to have significant adverse effects on the thermal efficiency of nuclear power plants. Copyright © 2015 Inderscience Enterprises Ltd.


Abudeif A.M.,Sohag University | Abdel Moneim A.A.,Sohag University | Farrag A.F.,Research Institute of Nuclear Power Plants
Annals of Nuclear Energy | Year: 2015

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.


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 | Year: 2015

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.


Ibrahim S.M.A.,Al - Azhar University of Egypt | Attia S.I.,Research Institute of Nuclear Power Plants
Annals of Nuclear Energy | Year: 2015

This study performs a thermodynamic analysis and energy balance to study the effect of fouling change on the thermal performance of the condenser and the thermal efficiency of a proposed nuclear power plant. The study is carried out on a pressurized water reactor nuclear power plant. The results of the study show that the increasing of fouling factor decreases the power output and the thermal efficiency of the nuclear power plant. The main results of this study is that the impact of an increase in the condenser cooling seawater fouling factor in the range 0.00015-0.00035 m2 K/W is led to a decrease in the plant output power and thermal efficiency of 1.36% and 0.448%, respectively. The present paper researches into a real practical factor that has significant negative effect on the thermal efficiency of the nuclear power plants, which is fouling of condenser cooling seawater. This is abundantly important since one of the top goals of new power stations are to increase their thermal efficiency, and to prevent or minimize the reasons that lead to loss of output power. © 2014 Elsevier Ltd.


Hussein A.S.,Naif Arab University for Security science | Hussein A.S.,Research Institute of Nuclear Power Plants
Radioprotection | Year: 2014

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.


Petrosyan V.G.,Research Institute of Nuclear Power Plants | Yeghoyan E.A.,Research Institute of Nuclear Power Plants
Thermal Engineering (English translation of Teploenergetika) | Year: 2015

The specific features of the service cooling water system used at the Armenian NPP and modifications made in the arrangement for supplying water to the water coolers in order to achieve more efficient cooling are presented. The mathematical model applied in carrying out the analyses is described, the use of which makes it possible to investigate the operation of parallel-connected cooling towers having different hydraulic and thermal loads. When the third standby cooling tower is put into operation (with the same flow rate of water supplied to the water coolers), the cooled water temperature is decreased by around 2–3°C in the range of atmospheric air temperatures 0–35°C. However, the introduced water distribution arrangement with a decreased spraying density has limitation on its use at negative outdoor air temperatures due to the hazard intense freezing of the fill in the cooling tower peripheral zone. The availability of standby cooling towers in the shutdown Armenian NPP power unit along with the planned full replacement of the cooling tower process equipment create good possibilities for achieving a deeper water cooling extent and better efficiency of the NPP. The present work was carried out with the aim of achieving maximally efficient use of existing possibilities and for elaborating the optimal cooling tower modernization version. Individual specific heat-andmass transfer processes in the chimney-type evaporative cooling towers are analyzed. An improved arrangement for distributing cooled water over the cooling tower spraying area (during its operation with a decreased flow rate) is proposed with the aim of cooling water to a deeper extent and preserving the possibility of using the cooling towers in winter. The main idea behind improving the existing arrangement is to exclude certain zones of the cooling tower featuring inefficient cooling from operation. The effectiveness of introducing the proposed design is proven by calculations (taking as an example the particular adopted design sizes and operating parameters). It is expected that after modernizing all four cooling towers (with increasing the total spraying area by 42%) the NPP power output will increase by more than 7 MW. © 2015, Maik Nauka-Interperiodica Publishing, all rights reserved.


Ibrahim S.M.A.,Al - Azhar University of Egypt | Attia S.I.,Research Institute of Nuclear Power Plants
Progress in Nuclear Energy | Year: 2014

This paper studies the impact of the salinity and temperature on the thermal performance of a proposed pressurized water reactor nuclear power plant. Applying the thermodynamic and heat transfer analyses based on the thermodynamic and heat transfer laws to gain some new aspects into the plant performance. The main results of this study are that many thermo-physical properties of seawater are affected by changes in salinity of the coolant extracted from environment. Also, the impact of increase in salinity leads to a decrease in the power output and the thermal efficiency of the nuclear power plant. This is abundantly important since one of the top goals of new power stations are to increase their thermal efficiency, and to prevent or minimize the reasons that lead to loss of output power. So, the paper offers an additional design dimension to be considered when designing new power stations. © 2014 Elsevier Ltd.

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