Sustainable nuclear energy moves a step closer

Dec 11, 2006

In future a new generation of nuclear reactors will create energy, while producing virtually no long-lasting nuclear waste, according to research conducted by Wilfred van Rooijen, who will receive his Delft University of Technology (Netherlands) PhD degree based on this research subject on Tuesday, 12 December.

Wilfred van Rooijen's research, conducted at the Reactor Institute Delft, focused on the nuclear fuel cycle and safety features of a Gas-cooled Fast Reactor (GFR), one of the so-called 'fourth generation' nuclear reactor designs. These designs have a sustainable character: they are economical in their use of nuclear fuel and are capable of rendering a great deal of their own nuclear waste harmless. The ability to actually build such reactors is however still in the very distant future.

The fourth generation GFR uses helium as a coolant at high temperatures. GFR's ultimate objective is to create a closed nuclear fuel cycle, in which only natural uranium is used as a raw material and in which the resulting waste consists of only nuclear fission products. Uranium and heavier isotopes, such as plutonium and americum, are recycled in the reactor and ultimately burned up (fissioned). In the reactors in use today, these heavy isotopes determine the long-term radioactivity of the nuclear waste. A closed nuclear fuel cycle therefore allows for maximum use of the raw materials, while at the same time substantially reducing the life-span of the waste.

This PhD research showed that it is possible to obtain a closed nuclear fuel cycle with a GFR. It also revealed that the GFR could use the waste materials of other light water reactors (LWR). The Gas-cooled Fast Reactor can therefore serve as an 'incinerator' of nuclear waste.

To increase the GFR's safety, special elements have been designed to automatically shut down the reactor during incidents. Van Rooijen's research has shown that with these elements the reactor is capable of withstanding incidents without damage to the nuclear fuel.

Source: Delft University of Technology

Explore further: Testing heats up at Sandia's Solar Tower with high temperature falling particle receiver

Related Stories

A brief history of nukes in space

Jun 26, 2015

In just a few short weeks, NASA's New Horizons spacecraft will make its historic flyby of Pluto and its moons. Solar panels are unable to operate in the dim nether regions of the outer solar system, and instead, ...

UW researchers scaling up fusion hopes

Jun 02, 2015

Producing reliable fusion energy—the same process that powers the sun—has long been a holy grail of scientists here on Earth. It releases no greenhouse gases, can be fueled by elements found in seawater ...

Recycling nuclear waste via advanced reactor design

May 28, 2015

An advanced nuclear reactor under development by Hitachi could help solve the nuclear waste problem, and University of Michigan researchers were involved in verifying its safe performance through computer ...

Recommended for you

Solar Impulse reaches half way in Japan-US leg

10 hours ago

A solar-powered aircraft flying between Japan and Hawaii as part of a round-the-world bid passed the halfway point of the perilous Pacific Ocean crossing Wednesday, and smashed its own endurance record.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.