Advanced Reactors Systems for Sustainable Nuclear Power

deinert
SPEAKER:
MARK DEINERT, PH.D.

ASSISTANT PROFESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
THE UNIVERSITY OF TEXAS AT AUSTIN

DATE/TIME:
MON, 11/17/2014 - 4:00PM TO 5:00PM
LOCATION:
3105 ETCHEVERRY HALL
Fall 2014 Colloquium Series
Abstract:

The environmental and geopolitical problems that are associated with nuclear power stem in part from the accumulation of the transuranics in used nuclear fuel. By limiting the production of these four elements many of the concerns that surround the future development of nuclear energy would be significantly reduced.  This fact has been known within the nuclear engineering community for decades, and several methods for transmuting these transuranics into more benign forms have been proposed.  Advanced recycle strategies that use conventional light-water reactors offer ways of achieving significant reductions in transuranics using conventional reactor systems.  Breed-burn reactors offer a potential way to limiting transuranic production with the advantage they make very efficient use of uranium.  I will discuss some of the work that we are currently doing on these systems in my group.

About the Speaker:

Mark Deinert is on the faculty in the Nuclear and Radiation Engineering program at The University of Texas at Austin.  He completed a Ph.D. in Nuclear Science and Engineering at Cornell University, where he was also a Postdoctoral Fellow in the Department of Theoretical and Applied Mechanics.  His research is focused on several aspects of advanced nuclear fuel cycles and reactor designs that minimize environmental impacts.  His recent work has appeared in the journals Geophysical Research Letters, Chaos, Energy Economics, the Journal of Applied Physics and it has been profiled in both Nature and Science.

Superheavy Element Discovery and Chemistry at LLNL

Dawn_Shaughnessy
SPEAKER:
DAWN SHAUGHNESSY, PH.D.

DEPUTY DIRECTOR,HEAVY ELEMENT DISCOVERY GROUP,
LAWRENCE LIVERMORE NATIONAL LABORATORY

DATE/TIME:
MON, 11/24/2014 - 4:00PM TO 5:00PM
LOCATION:
3105 ETCHEVERRY HALL
Fall 2014 Colloquium Series
Abstract:

The heavy element group at Lawrence Livermore National Laboratory (LLNL) has had a long tradition of nuclear and radiochemistry dating back to the 1950’s.  Some of the most exciting work has taken place in the last decade (in collaboration with the Flerov Laboratory of Nuclear Reactions in Dubna, Russia) with the discovery of six new elements - 113, 114, 115, 116, 117, and 118.  By pushing the boundaries of the periodic table, we can start to answer some of the most fundamental questions of nuclear science, such as the locations of the next “magic numbers” of protons and neutrons, and the possibility of an “Island of Stability” where nuclides would have lifetimes much longer than those currently observed in the heaviest elements.  We have already seen evidence of extra-stability in the heaviest nuclides, which leads to half-lives that are long enough for us to perform chemistry on these isotopes one atom at a time.  Work is underway on developing an automated chemical system that will be used for studying chemical properties of elements 104 and 105.  New chemical separations are being studied that can be deployed using a multi-column automated system.  These experiments will provide the ground work for performing aqueous chemistry later on even heavier elements such as element 114 where the chemical properties are completely unknown.  In this overview the discovery of these new elements and the chemical experiments in progress will be discussed.  This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.  This work was funded by the Laboratory Directed Research and Development Program at LLNL under project tracking code 11-ERD-011.

About the Speaker:

Dawn Shaughnessy received a B.S. in Chemistry from the University of California at Berkeley in May of 1993.  After graduating, she decided to remain at Berkeley and pursue a Ph.D. with a focus on nuclear chemistry.  She joined the research group of Professor Darleane Hoffman and received a Ph.D. in 2000.  Her research focused on the delayed fission properties of isotopes of einsteinium, which were produced at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory.  During her tenure at Berkeley, Dawn received an award as one of the top Graduate Student Instructors through the College of Chemistry.  After finishing graduate school, Dawn began a postdoctoral appointment at Lawrence Berkeley National Laboratory in the Chemical Sciences Division under Professor Heino Nitsche.  Her research was the study of how plutonium interacts with naturally occurring manganese-bearing minerals as part of a DOE Environmental Management Project geared toward clean-up of nuclear materials in the environment.  After completing her postdoc in 2002, she accepted a term position at Lawrence Livermore National Laboratory in the Stockpile Radiochemistry Group.  She has recently been appointed group leader for the newly created Experimental Nuclear and Radiochemistry Group, which is currently part of the Chemical Sciences Division at LLNL, and is also the Responsible Scientist for radiochemical debris collection at the National Ignition Facility.  In addition, she is the project leader of the LLNL heavy element program, which announced discovery of element 117 in April of 2010.  In May of 2012, it was also announced by the International Union of Pure and Applied Chemistry that element 116 would be officially known as “livermorium”, an honor granted to the LLNL heavy element program in recognition of their years of research.  Dawn’s  general research interests include actinide and heavy element chemistry, chemical automation, nuclear forensics methods and radiochemical diagnostics.  She has been a staff chemist at LLNL for 12 years.  Most recently she was awarded the DOE Office of Science Outstanding Mentor Award (2010), the Gordon Battelle Prize for Scientific Discovery for the discovery of element 117 (2010), and was inducted into the Alameda County Women’s Hall of Fame for Scientific Discovery (2012).

Kinetic analysis of criticality accident in weakly coupled fuel solution system

Obara
SPEAKER:
PROFESSOR TORU OBARA

PROFESSOR OF RESEARCH LABORATORY FOR NUCLEAR REACTORS, TOKYO INSTITUTE OF TECHNOLOGY

DIRECTOR OF CENTER FOR RESEARCH INTO INNOVATIVE NUCLEAR ENERGY SYSTEMS (CRINES), TOKYO INSTITUTE OF TECHNOLOGY

DATE/TIME:
FRI,
11/14/2014 - 4:00PM TO 5:00PM
LOCATION:
3105 ETCHEVERRY HALL
Fall 2014 Colloquium Series
Abstract:

In criticality accidents of fuel solutions, if there are several solution tanks located near the tank that becomes super-critical, the total released energy can be larger than that involving just one tank, because of the neutron interaction between the tanks. Thus, it is important to perform transient analysis in such cases by taking into account the neutron interaction between the tanks. A kinetic analysis code based on an integral kinetic model was developed and applied to the kinetic analysis of criticality accidents in a weakly coupled system. If it is possible to know the total energy release in a compound accident compared to an accident in a single solution tank, this would be useful for the protection against radiation in such accidents. The methodology to predict the total energy is shown in criticality accidents involving several fuel solution tanks from the knowledge of how much energy is released in a single solution tank using the integral kinetic model.

Safety Countermeasure of Onagawa NPS after the Great East-Japan Earthquake, and the current situation of nuclear power in Japan

obonai
SPEAKER:
AKIYOSHI OBONAI

TOHOKU ELECTRIC POWER COMPANY

DATE/TIME:
MON, 11/14/2014 - 4:00PM TO 5:00PM
LOCATION:
180 DOE LIBRARY
Fall 2014 Colloquium Series
Abstract:

On, March 11, a massive earthquake occurred at 2:46 p.m. Japan standard time, and the epicenter was about 130km off the Pacific Ocean from the Oshika peninsula where Onagawa NPS is located.

First, I would like to talk about what happened at Onagawa Nuclear Power Station (NPS), and how we managed the plant in order to reach a cold shut down.

Next I would like to talk about the safety countermeasure after 3/11, learning the lesson from Onagawa and Fukushima. We conducted the detailed evaluation of 3/11/’11 earthquakes and tsunamis. Based on this evaluation, we have been conducting further seismic reinforcement and constructing high levee (about 29m above sea level).  In addition, we are making safety upgrades for severe accident, i.e. Filtered Containment Vessel System, and alternative decay heat removable system.

Finally, I would like to talk about the current situation of nuclear power in Japan. For example, government policy, people’s attitude toward nuclear power, and the circumstance for restarting nuclear power station.

About the Speaker:

Akiyoshi Obonai received his masters in Nuclear Engineering from the University of California, Berkeley in 1994.  He currently works for the Tohuko Electric Power Company in reactor operation, reactor safety analysis and nuclear fuel management.  He is certified by the Japanese government as a Chief Nuclear Reactor Engineer and Chief Electrical Engineer.

Systematic Study of a Small, Long-life HTGR Design for Passive-Decay Heat Removal

sambuu
SPEAKER:
ODMAA SAMBUU

DOCTORAL PROGRAM STUDENT, DEPARTMENT OF NUCLEAR ENGINEERING, TOKYO INSTITUTE OF TECHNOLOGY

DATE/TIME:
FRI, 11/14/2014 - 12:15PM TO 1:00PM
LOCATION:
4101 ETCHEVERRY HALL
Fall 2014 Colloquium Series
Abstract:

Failure to remove residual decay heat in the Fukushima Daiichi Nuclear Power Plant in 2011 has definitely influenced design attitudes toward nuclear reactors with passive-decay heat-removal features. Generally, modular high temperature gas-cooler reactors (HTGRs) have the ability to remove decay heat apart from their active and passive cooling systems. However, the feasibility of passive-decay heat removal in HTGRs is subject to design parameters. A systematic methodology for designing HTGR for passive-decay heat removal is introduced. As a part of this study, the conditions of several design parameters is used obtained in previous research for both underground and aboveground HTGRs capable of removing decay-heat successfully and satisfying the safety limit of temperatures of fuel and reactor buildings (RB) . The neutronic performance of a small HTGR whose design parameters were obtained using the conditions was investigated also.

Lessons Learned from CIRFT Testing Methodology in Applying to High Burn-up Spent Nuclear Fuel Vibration Integrity Study

Wang
SPEAKER:
JOHN JY-AN WANG

MATERIALS SCIENCE & TECHNOLOGY DIVISION
OAK RIDGE NATIONAL LABORATORY, OAK RIDGE, TN

DATE/TIME:
MON, 11/03/2014 - 4:00PM TO 5:00PM
LOCATION:
3105 ETCHEVERRY HALL
Fall 2014 Colloquium Series
Abstract:

A cyclic integrated reversible-bending fatigue tester (CIRFT) was developed to support U.S. NRC and DOE Used Fuel Disposition Campaign studies on high burn-up (HBU) spent nuclear fuel (SNF) transportation during normal conditions of transport (NCT). Several HBU SNF samples from both Zr-4 and M5 clad were investigated. During CIRFT program development, finite element analysis (FEA) was used to translate CIRFT global measurement data to the localized stress-strain profiles. The stress concentration effect at pellet-pellet interface region was also observed from FEA and such phenomenon was also revealed by CIRFT testing where the majority SNF rod failures are located at pellet-pellet interface. The information resulting from these studies will be presented, as outlined below:

•    Fuel support to the clad stiffness during random vibration
•    Stress concentration effects on the clad at pellet-pellet interfaces
•    The translation of CIRFT global measurements to local stress-strain levels
•    Potential hydrogen effects on SNF vibration integrity
•    Pellet-clad bonding efficiency on SNF mechanical properties
•    Failure mechanisms of HBU SNF rods under reverse bending forces, and
•    The potential impact of combined loading modes and loading rates on SNF vibration integrity.

About the Speaker:

Dr. John Jy-An Wang is a Distinguished Research Staff Member at Oak Ridge National Laboratory (ORNL). He received a Ph.D. from University of California, Berkeley, in 1988, in the field of mechanics of material and structural dynamics from Civil Engineering Department. Since 1989 he has been working at ORNL as a research scientist. During his residence at ORNL he has published over 170 technical reports and journal articles on subjects related to fatigue and fracture toughness evaluation of structural materials, the neutron radiation embrittlement predictions for pressure vessel steels, the development of power reactor and test reactor databases for reactor material aging research, spent nuclear fuel vibration reliability investigation, pipeline hydrogen embrittlement study, interfacial fracture toughness research for polymeric composites as well as for weld HAZ materials, cavitation damage simulation research, and high temperature power transmission conductor-connector system reliability investigation.

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