Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

High plutonium breeding of light water cooled reactors

16.01.2013
Professor Oka and his research team at Waseda University have succeeded in developing the world's first conceptual nuclear reactor design of high plutonium breeding by light water cooling.

Professor Oka's research team succeeded to develop the conceptual nuclear reactor design of high plutonium breeding by light water cooling for the first time in the world. He devised a new fuel assembly where fuel rods are closely packed for reducing reactor coolant to fuel volume fraction for high breeding.

With computational analysis he succeeded high plutonium breeding with light water cooling. The study will open the way of commercialization of fast reactor and nuclear fuel cycle for peaceful use of nuclear energy based on the mature light water cooling technologies. The result of the study was published in January issue of "Journal of Nuclear Science and Technology" of Atomic Energy Society of Japan (AESJ) , entitled "Plutonium breeding of light water cooled fast reactors".

Introduction

Fast Breeder reactors (FBR) produce more fissile material than consuming, while producing electric power. It is a "dream of nuclear power". The main line of FBR development is the liquid metal cooled fast breeder reactor (LMFBR) . It is, however, not yet commercialized because of the complexity of the plant due to using liquid sodium as the coolant.

High plutonium breeding by light water cooling has been studied for many years, but not yet attained. Nuclear power plants and fossil fired power plant use water as the coolant. It is good to develop fast breeder reactor based on the experience of water coolant technologies.

Commercialization of nuclear fuel cycle and fast breeder reactors are important for reducing the amount of spent nuclear fuel of light water reactors (LWR) as well as the efficient utilization of uranium resources. Nuclear power utilization is in progress in many developing countries. Commercialization of spent nuclear fuel reprocessing in advanced countries enhances the nuclear security in the world.

High conversion light water reactors have been studied for many years since 1970 at research institutes and industry in Japan. The highest breeding characteristics were reported by the conceptual design study of the doubly axial heterogeneous core of a reduced moderation boiling water reactor (RMWR) . The compound system doubling time (CSDT) was, however, approximately 245 years. It is substantially longer than that of LMFBR.

New Concept

Breeding characteristics increases with decreasing the water to fuel volume ratio. Tight fuel lattice with narrow gap between fuel rods was adopted for RMWR. For further decreasing the water to fuel volume fraction, a new fuel assembly of closely packed fuel rods was devised. The new fuel assembly and its fuel lattice consisting of three fuel rods are depicted in Fig.1. The coolant flows through the central hole of fuel lattice. The integrity or the leak tightness of the fuel rod is maintained as the conventional fuel rod where both ends of the fuel cladding tube are welded by end plugs.

The reactor design was carried out by computational methods for the cores with new fuel assemblies. The highest breeding characteristics are obtained for the core layout of the fuel assemblies in Fig. 2. The comparison of the characteristics with the RMWR is given in Table 1. The compound system doubling time is 43 years. It is substantially shorter than that of RMWR, 245 years.

Goal of breeding characteristics

The energy demand increases with the gross domestic product (GDP) . The growth rate of GDP of seven advanced countries of OECD is 1.4% per year in 10 years. With this growth rate, the GDP becomes double in 50 years and the energy demand does. The breeding characteristic of Table1 is 43 years, shorter than 50 years. It means that the fast breeder reactors with the new fuel assembly meet the goal of energy demand growth of advanced countries.

Future Research and Development items

Reactor design of boiling water reactor (BWR) condition, safety design and evaluation, development of the new fuel assembly including testing, demonstration with a prototype reactor.
Social impacts

High breeding with water cooling technology will open the way of commercializing nuclear fuel cycle and fast breeder reactors. It made it possible to reduce the amount of spent LWR fuels, to enhance the deployment and the security of peaceful uses of nuclear power in developing countries.

NOTES

Compound system doubling time (CSDT) : Time required for system of identical breeder reactors to double the fissile material in the system, assuming that the number of reactors is increasing at a rate such that all of the fissile material is being utilized.

Light water: Water of natural composition of H2O and D2O. It is a technical term of nuclear technology in order to distinguish heavy water consisting of pure D2O

Journal information
Yoshiaki Oka, Takashi Inoue and Taishi Yoshida, "Plutonium breeding of light water cooled fast reactors", J. Nuclear Science and Technology, vol.50 No.1, 15-20 (2013)

Funding information

Grant in Aid for Scientific Research (B) o. 22360398, JSPS/ MEXT.
"Research and Development of Super Fast Reactor" entrusted to Waseda University by MEXT/ JST

waseda university | Research asia research news
Further information:
http://www.waseda.jp/eng/news12/130108_oka.html
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht Studying fundamental particles in materials
17.01.2017 | Max-Planck-Institut für Struktur und Dynamik der Materie

nachricht Seeing the quantum future... literally
16.01.2017 | University of Sydney

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Water - as the underlying driver of the Earth’s carbon cycle

17.01.2017 | Earth Sciences

Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

17.01.2017 | Materials Sciences

Smart homes will “LISTEN” to your voice

17.01.2017 | Architecture and Construction

VideoLinks
B2B-VideoLinks
More VideoLinks >>>