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Comparison of MAAP and MELCOR: and evaluation of MELCOR as a deterministic tool within RASTEP
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
2014 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This master's thesis is an investigation and evaluation of MELCOR (a software tool for severe accident analyses regarding nuclear power plants), or more correctly of the (ASEA-Atom BWR 75) reactor model developed for version 1.8.6 of MELCOR. The main objective was to determine if MELCOR, with the reactor model in question, is able to produce satisfactory results in severe accident analyses compared to results made by MAAP, which is currently the only official software tool for this application in Sweden.

The thesis work is related to the RASTEP project. This project has been carried out in several stages on behalf of SSM since 2009, with a number of specific issues explored within an NKS funded R&D project carried out 2011-2013. This investigation is related to the NKS part of the project. The purpose with the RASTEP project is to develop a method for rapid source term prediction that could aid the authorities in decision making during a severe accident in a nuclear power plant. A software tool, which also gave the project its name, i.e. RASTEP (RApid Source TErm Prediction), is therefore currently under development at Lloyd's Register Consulting. A software tool for severe accident analyses is needed to calculate the source terms which are the end result from the predictions made by RASTEP.

A set of issues have been outlined in an earlier comparison between MAAP and MELCOR. The first objective was therefore to resolve these pre-discovered issues, but also to address new issues, should they occur. The existing MELCOR reactor model also had to be further developed through the inclusion of various safety systems, since these systems are required for certain types of scenarios. Subsequently, a set of scenarios was simulated to draw conclusions from the additions made to the reactor model.

Most of the issues (pre-discovered as well as new ones) could be resolved. However the work also rendered a set of issues which are in need of further attention and investigation. The overall conclusion is that MELCOR is indeed a promising alternative for severe accident analyses in the Swedish work with nuclear safety.

Several potential benefits from making use of MELCOR besides MAAP have been identified. In conclusion, they would be valuable assets to each other, e.g. since deviations in the results (between the two codes) would highlight possible weaknesses of the simulations. Finally it is recommended that the work on improving the MELCOR reactor model should continue. 

Place, publisher, year, edition, pages
2014. , 64 p.
UPTEC ES, ISSN 1650-8300 ; 14040
Keyword [en]
MELCOR, MAAP, severe accident, nuclear, radioactive, radioactivity, thermal hydraulics, core cooling systems, nuclear power, bar, reactor, per, RASTEP
Keyword [sv]
MELCOR, MAAP, allvarliga incidenter, kärnkraft, radioaktiv, radioaktivitet, termohydraulik, härdnödkylning, nödsystem, kylsystem, termodynamik, reaktor, bwr, pwr, RASTEP
National Category
Energy Systems
URN: urn:nbn:se:uu:diva-233768OAI: oai:DiVA.org:uu-233768DiVA: diva2:754255
External cooperation
Lloyd's Register Consulting
Educational program
Master Programme in Energy Systems Engineering
Available from: 2014-11-19 Created: 2014-10-09 Last updated: 2014-11-20Bibliographically approved

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