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Neutronic analysis of control rod effect on safety parameters in Tehran Research Reactor
Mina Torabi,A. Lashkari,Seyed Farhad Masoudi,Somayeh Bagheri 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.7
The measurement and calculation of neutronic parameters in nuclear research reactors has an importantinfluence on control and safety of the nuclear reactor. The power peaking factors, reactivity coefficientsand kinetic parameters are the most important neutronic parameter for determining the state of thereactor. The position of the control shim safety rods in the core configuration affects these parameters. The main purpose of this work is to use the MTR_PC package to evaluate the effect of the partiallyinsertion of the control rod on the neutronic parameters at the operating core of the Tehran ResearchReactor. The simulation results show that by increasing the insertion of control rods (bank) in the core,the absolute values of power peaking factor, reactivity coefficients and effective delayed neutron fractionincreased and only prompt neutron life time decreased. . In addition, the results show that the changes ofmoderator temperature coefficients value versus the control rods positions are very significant. Theaverage value of moderator temperature coefficients increase about 98% in the range of 0e70% insertionof control rod
Najafpour, Mohammad Mahdi,Ghobadi, Mohadeseh Zarei,Hosseini, Seyedeh Maedeh,Chae, Keun Hwa,Mehrabani, Somayeh,Rafighi, Parvin,Bagheri, Robabeh,Song, Zhenlun Pergamon Press 2017 International journal of hydrogen energy Vol.42 No.22
<P><B>Abstract</B></P> <P>Water oxidation is a bottleneck of the hydrogen production through the water-splitting reaction. Herein, the promising role of fluoride on the water-oxidizing activity of a nanolayered Mn oxide under the electrochemical condition is reported. The experiments show the increase of the water-oxidizing activity of the nanolayered Mn oxide under an electro-water oxidation circumstance in the presence of potassium fluoride as a promising additive to an electrolyte. As a result, the required overpotential is decreased and the yield of oxygen evolution raised in the water-oxidation reaction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydrogen production by water splitting is a promising way to store sustainable energies. </LI> <LI> Mn oxide is promising to be used in water splitting systems. </LI> <LI> The effect of fluoride on water-oxidizing activity of nanolayered Mn oxide was reported. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Herein, the promising role of fluoride on the water-oxidizing activity of a nanolayered Mn oxide under the electrochemical condition is reported.</P> <P>[DISPLAY OMISSION]</P>