Analysis of Reactivity Insertion Accidents for the NIST Research Reactor before and after Fuel Conversion

2014 ◽  
Vol 185 (1) ◽  
pp. 1-20 ◽  
Author(s):  
J. S. Baek ◽  
A. Cuadra ◽  
L.-Y. Cheng ◽  
A. L. Hanson ◽  
N. R. Brown ◽  
...  
Keyword(s):  
Research Reactor ◽  
Fuel Conversion ◽  
Before And After ◽  
Reactivity Insertion

scholarly journals Accident Analysis for the NIST Research Reactor Before and After Fuel Conversion

2012 ◽  
Author(s):  
Baek J. ◽  
Diamond D. ◽  
A. Cuadra ◽  
A.L. Hanson ◽  
L-Y. Cheng ◽  
...  
Keyword(s):  
Research Reactor ◽  
Accident Analysis ◽  
Fuel Conversion ◽  
Before And After

Advanced Fe-Cr Alloys Studied by Pulsed Low Energy Positron System Before and After Helium Ions Implantation

2009 ◽  
Author(s):  
Stanislav Sojak ◽  
Vladimi´r Krsˇjak ◽  
Werner Egger
Keyword(s):  
Research Reactor ◽  
Chromium Content ◽  
Depth Profiling ◽  
Positron Annihilation Spectroscopy ◽  
Implantation Dose ◽  
Low Energy ◽  
Microstructural Damage ◽  
Helium Ion ◽  
Before And After ◽  
Non Destructive

Positron annihilation spectroscopy (PAS) is a non-destructive technique which provides information about microstructural damage of structural materials. In this paper, the Pulsed Low Energy Positron System (PLEPS) at the research reactor FRM-II at TU Munich was used to study depth profiling of binary Fe-Cr alloys. Fe-Cr model alloys with different chromium content were investigated in the as-received state as well as after helium ion implantation (dose up to 6.24×1017 ions/cm−2). Measured results show changes in the size of defects after implantation and also in non-implanted specimens depending on the Cr content.

The Simulation of Decontamination Works in Premises of the Research Reactor in NRC “Kurchatov Institute”

2013 ◽  
Author(s):  
Alexey Danilovich ◽  
Oleg Ivanov ◽  
Victor Potapov ◽  
Sergey Smirnov ◽  
Vyacheslav Stepanov
Keyword(s):  
Remote Sensing ◽  
Research Reactor ◽  
Research Centre ◽  
Kurchatov Institute ◽  
Radiation Fields ◽  
Before And After ◽  
Reduce Radiation Dose ◽  
Spectrometric System ◽  
Remote Sensing Methods ◽  
Russian Research

Application of remote sensing methods using a spectrometric collimated system allows obtaining information about features of a formation of radiation fields in contaminated premises. This information helps in a preparation of a phased plan for dismantling of contaminated equipment. When the survey of technological premises of the research reactor at the Russian Research Centre “Kurchatov institute” was conducted the remote controlled collimated spectrometric system was used [1]. With its help the scanning of surveyed premises were carried out. As a result of this work, the distribution pattern of radionuclides activity was restored. The simulation of decontamination works was carried out and maps of the distribution of activity and dose rate for surveyed premises were plotted and superimposed on its photo for situations before and after decontamination. The use of obtained results will allow significantly reduce radiation dose for staff at work on dismantling.

Analysis of Loss-of-Flow Accidents for the NIST Research Reactor with Fuel Conversion from HEU to LEU

2015 ◽  
Vol 189 (1) ◽  
pp. 71-86 ◽  
Author(s):  
J. S. Baek ◽  
A. Cuadra ◽  
L.-Y. Cheng ◽  
A. L. Hanson ◽  
N. R. Brown ◽  
...  
Keyword(s):  
Research Reactor ◽  
Fuel Conversion

scholarly journals Startup, transition core, and molybdenum-99 production upgrade analyses for low-enriched uranium fuel conversion at the University of Missouri research reactor

2020 ◽  
Author(s):  
◽  
Wilson Cowherd
Keyword(s):  
Low Power ◽  
Research Reactor ◽  
The United States ◽  
Fuel Conversion ◽  
Reactor Physics ◽  
University Of Missouri ◽  
Safety Margins ◽  
Enriched Uranium ◽  
The University ◽  
The Impact

Under the direction of the United States Department of Energy (DOE) National Nuclear Security Administration (NNSA) Office of Material Management and Minimization (M3) Reactor Conversion Program, the University of Missouri Research Reactor (MURR®) plans to convert from highly enriched uranium (HEU) fuel to low-enriched uranium (LEU) fuel. Low power physics startup test predictions, transition core planning, and analysis for a proposed fission-based molybdenum-99 production upgrade were done in support of LEU fuel conversion. As a first step to LEU fuel conversion, low-power physics tests will be performed to calculate reactor physics parameters. These parameters include flux distributions, coefficients of reactivity, and critical assembly measurements. To facilitate this test, reactor physics calculations were performed using MCNP5 to predict the values of these parameters. Implications of these predictions and areas of uncertainty in the prediction analysis are also discussed. Once MURR completes the testing of the initial LEU core, MURR will enter into a series of transition cycles until steady-state mixed-burnup operation is reached. A Python program was developed that incorporated the constraints of MURR operation while minimizing the time MURR will have to operate atypically during the transition cycles. The impacts of the transition cycles on experiment performance are reported, as well as the number of fuel elements needed. Finally, preliminary analysis on a proposed molybdenum-99 production device at MURR was performed. This analysis shows the impact on the reactor power distribution with implications to predicted safety margins as a part of the larger scope of the experiment analysis.

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