Results 191 to 200 of about 105,114 (238)

Calculational tools to conduct experimental optimization in Tehran research reactor

Annals of Nuclear Energy, 1999
Abstract Utilization of irradiation facilities in Tehran research reactor (TRR) requires proper computational tools to deliver accurate and precise results. In this paper validity of different schemes are checked against experimental measurements.
H Khalafi, M Gharib
openaire   +1 more source

Preliminary thermal-hydraulic safety analysis of Tehran research reactor during fuel irradiation experiment

Progress in Nuclear Energy, 2015
S. S. Arshi, H. Khalafi, S. Mirvakili
semanticscholar   +3 more sources

Determination of Tehran Research Reactor power by 16N gamma detection

Annals of Nuclear Energy, 2011
Abstract The radioisotope 16 N is produced by the interaction of fast neutrons with 16 O in water reactor coolant. This radioisotope emits at the two major gamma ray energies of 6.13 MeV and 7.1 MeV. Exploiting the linear relation between the number of gamma particles versus the reactor power change, the reactor power is determined by detecting and
Hamid Reza Armozd, Morteza Gharib, Hossein Afarideh, Mitra Ghergherehchi, Azim Ahmadi Niar, Morteza Jafarzadeh   +5 more
openaire   +1 more source

Gross alpha/beta and radionuclide activity concentrations in soil, plant and some fruits around the Tehran Research Reactor.

Applied Radiation and Isotopes
Human activities usually have some contamination as effluents from chemical industries and radionuclides from nuclear reactors. For assessing the probable radioactive contamination in vicinity of Tehran Research Reactor, The gross alpha and beta ...
N. Sadeghi, Shiva Jabbari, Mahsa. Behzad
semanticscholar   +1 more source

Reactor core power measurement using Cherenkov radiation and its application in Tehran Research Reactor

Annals of Nuclear Energy, 2009
Abstract Cherenkov radiation is a process that could be used as an extra channel for power measurement to enhance redundancy and diversity of a reactor. This is especially easy to establish in a pool type research reactor. A simple photo diode array is used in Tehran Research Reactor to measure and display power in parallel with the existing ...
M. Arkani, M. Gharib
openaire   +1 more source

Determination of urgent protective action zone in Tehran research reactors-associated accidents

Nuclear Engineering and Design, 2021
Abstract In accidents leading to the release of radioactive materials into the environment, it is of great importance to determine the urgent protective action zone (UPZ) in the emergency preparedness phase. The present study was conducted to determine the radius of this area for a low-power research reactor, taking into account the worst conditions ...
S.M. Hosseini Pooya, M. Hosseinipanah, R. Adeli   +2 more
openaire   +1 more source

Sensitivity Analysis of Kinetics Parameters of Tehran Research Reactor (TRR)

Volume 5: Fuel Cycle and High and Low Level Waste Management and Decommissioning; Computational Fluid Dynamics (CFD), Neutronics Methods and Coupled Codes; Instrumentation and Control, 2009
In this research, effective delayed neutron fraction (βeff) and neutron generation time (Λ) of the Tehran Research Reactor (TRR) are calculated for different uranium enrichments from 14.84 w/o to 96.56 w/o U235 in two states of the TRR, (cold fuel, clad and coolant temperature of 20 °C; and hot fuel, clad and coolant temperature of 65, 49 and 44 °C ...
Seyed Abolfazl Hosseini, Naser Vosoughi
openaire   +1 more source

Residual heat estimation by using Cherenkov radiation in Tehran Research Reactor

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2008
Abstract An experiment is set up in Tehran 5 MW research reactor to observe Cherenkov radiation response during post-shutdown periods. An ordinary PC camera is used for this purpose. Theoretical estimation of the total power including decay heat and neutronic power is checked against detector response. A general agreement suggests that the same setup
M. Arkani, M. Gharib
openaire   +1 more source

Radioactive dispersion model for Tehran research reactor and radioisotope laboratory stacks

2010 International Conference on Environmental Engineering and Applications, 2010
In this paper, the amount of released radionuclide from Tehran's research reactor and radioisotope laboratory stacks has been studied. The aim of this work is to determine the amount and type of radioactive material and to estimate their risk once they released to the environment. To perform the above two task, a computer modeling using cap-88 code and
Nahid Sadeghi, Hossein sajadi, Ramin Salartash   +2 more
openaire   +1 more source

Enhancing Tehran research reactor safety using a core differential pressure measuring system

Annals of Nuclear Energy, 2020
Abstract Flapper Spurious opening during reactor operation is one of the most perilous accidents for pool-type research reactors. In TRR during such event, if none of SCRAMs could shut-down reactor, partially fuel elements burn-out is occurred. To avoid that, a core cooling condition monitoring system is developed.
Ebrahim Abedi, Amin Davari, Seyed Mohammad Mirvakili   +2 more
openaire   +1 more source