Modelling of the Reactor Containment Cooling in OL1 and OL2

• Main Author: Sand, Anna
• Format: Others
• Language: English
• Published: Uppsala universitet, Institutionen för fysik och astronomi 2009
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-162792

The objective of the work presented in this report was to evaluate the possibility to make an accurate model of the cooling chains of the reactor containment in a new computation program for containment analysis. A model of the cooling chains of the reactor containment has been built in the new computation program. A simple model of Olkiluoto 1 and 2 which had previously been built in the new computation program formed the basis of the project. Information and technical specifications about the cooling chain and the reactor containment has been gathered, compiled and used as input to make the model accurate. The model was verified against manufacturers’ data. Finally, a benchmark test with main steam line break at full power, against the existing model has been made. The new computation program can be used to model the cooling chain to obtain almost the same result as in the existing program. The new model takes longer time to build, though it is more detailed. On the other hand, because it is more detailed, it can describe the phenomena during a loss of coolant accident better than the existing program. There are also possibilities to make sensitivity analyses, e.g., what happens if a pump stops or a pipe ruptures.