Featured Research

from universities, journals, and other organizations

New Calculation Code Opens New Possibilities In Nuclear Reactor Modeling

Date:
June 28, 2007
Source:
VTT Technical Research Centre of Finland
Summary:
A researcher in Finland has developed a new calculation code in his doctoral thesis, for the modeling of neutron physics in nuclear reactors. The so-called Monte Carlo method has not been widely used for the production of input parameters for three-dimensional reactor simulator calculations.

Research Scientist Jaakko Leppänen from VTT Technical Research Centre of Finland has developed a new calculation code in his doctoral thesis, for the modelling of neutron physics in nuclear reactors. The so-called Monte Carlo method used by Leppänen has not been widely used for the production of input parameters for three-dimensional reactor simulator calculations.

Related Articles


The Monte Carlo method is a basic tool in particle transport problems, and it is well suited for tasks requiring the detailed modelling of geometry and physics. The method has been used in reactor physics calculations for decades, and the applications have mainly been restricted by computer capacity. In Leppänen's thesis, the use of the method is extended to new applications, when input parameters for three-dimensional reactor simulator calculations are generated using a Monte Carlo based lattice code.

Nuclear reactor modelling is a complicated task that combines neutron transport theory and the thermal hydraulics of coolant flow through the reactor core. Because of the complicated physics of neutron interactions, it is not possible to approach the problem as a single, well-defined task. Instead, the solution proceeds in steps, starting from the interactions between neutrons and the target nuclei. The intermediate step in the solution is the so-called lattice calculation, in which the geometry is modelled at the fuel assembly level. The results are then used as input parameters for a three-dimensional reactor simulator calculation, which yields the reactor response under different operating conditions.

The presently-used deterministic lattice codes have been developed mainly for the needs of light water reactor modelling, and the applications are not easily extended to advanced fuel types and next-generation reactor systems. Development in nuclear technology may hence require development in the calculation methods as well. A transition from deterministic to Monte Carlo lattice codes along with increasing computer capacity seems like a natural step in this respect. The use of a Monte Carlo based lattice code also brings all the advantages of the calculation method, and most importantly, the same code can be used for modelling any fuel or reactor type without compromising the reliability of the results.

The new calculation code developed at VTT is at first intended as a research tool, to be used in parallel with current deterministic lattice codes. The comparison of two codes based on entirely different calculation methods increases the reliability of the analyses, which is reflected in fuel management and reactor safety studies. The new code can also be used in studies involving next-generation reactor technology, in which the current deterministic lattice codes may not be applicable.

Research Scientist Jaakko Leppänen has defended his doctoral thesis at the Helsinki University of Technology on 18 June 2007 with the subject "Development of a New Monte Carlo Reactor Physics Code". The opponent in the defence was Associate Professor Eduard Hoogenboom from Delft University of Technology, the Netherlands.


Story Source:

The above story is based on materials provided by VTT Technical Research Centre of Finland. Note: Materials may be edited for content and length.


Cite This Page:

VTT Technical Research Centre of Finland. "New Calculation Code Opens New Possibilities In Nuclear Reactor Modeling." ScienceDaily. ScienceDaily, 28 June 2007. <www.sciencedaily.com/releases/2007/06/070627223141.htm>.
VTT Technical Research Centre of Finland. (2007, June 28). New Calculation Code Opens New Possibilities In Nuclear Reactor Modeling. ScienceDaily. Retrieved April 18, 2015 from www.sciencedaily.com/releases/2007/06/070627223141.htm
VTT Technical Research Centre of Finland. "New Calculation Code Opens New Possibilities In Nuclear Reactor Modeling." ScienceDaily. www.sciencedaily.com/releases/2007/06/070627223141.htm (accessed April 18, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Saturday, April 18, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

NASA Electric Rover Goes for a Spin

NASA Electric Rover Goes for a Spin

Reuters - Innovations Video Online (Apr. 17, 2015) — NASA&apos;s prototype electric buggy could influence future space rovers and conventional cars. Jim Drury reports. Video provided by Reuters
Powered by NewsLook.com
Scientists Create Self-Powering Camera

Scientists Create Self-Powering Camera

Reuters - Innovations Video Online (Apr. 17, 2015) — American scientists build a self-powering camera that captures images without using an external power source, allowing it to operate indefinitely in a well-lit environment. Elly Park reports. Video provided by Reuters
Powered by NewsLook.com
The State Of Virtual Reality

The State Of Virtual Reality

Newsy (Apr. 17, 2015) — Virtual Reality is still a young industry. What’s on offer and what should we expect from our immersive new future? Video provided by Newsy
Powered by NewsLook.com
Tackling Congestion in the World's Worst Traffic City

Tackling Congestion in the World's Worst Traffic City

Reuters - News Video Online (Apr. 16, 2015) — New transportation system and regulations aim to resolve gridlock in Jakarta, which has been named the city with the world&apos;s worst traffic. Angie Teo reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins