The results of the research on severe accidents at NPP were discussed on 3-6 June in Albuquerque, USA during the technical meetings on the Cooperative Severe Accident Research Program (CSARP) and on the MELCOR Code Assessment Program.
The event participants included representatives of the USA, Canada, Japan, China, Korea, Sweden, Germany, France, Spain, Italy, Belgium, Czech Republic, Slovak Republic, Finland and others. Participation of expert from the State Scientific and Technical Center for Nuclear and Radiation Safety, Head of Laboratory of the NPP Thermohydraulic and Probabilistic Safety Analysis Department Yuriy Vorobyov became possible due to the cooperation between Ukraine and the USA under the agreement with the U.S. NRC.
During the technical meetings, the results of the research on severe accidents at NPP, development and use of computer codes for severe accidents, as well as analysis of severe accidents in the reactor and spent fuel pool, severe accident management, including discharge from the containment, retention of core melt within the reactor pressure vessel, etc. were considered in detail. In addition, practical exercises on MELCOR code use were conducted for the event participants.
Within the technical meeting on the MELCOR code assessment program, the issues of development, validation and recent modifications of this computer code were considered.
“Since MELCOR is the main for severe accident analysis in Ukraine, recent achievements in its development and validation are valuable international experience. Due to the opportunity provided by the US part, Ukraine has access to the latest versions of the computer code: MELCOR 1.8.6 and MELCOR 2.2. During this meeting, code developers from the Sandia Laboratory, USA presented technical reports on computer code validation, adaptation of computer models, planned improvements and experience of use”, Yuriy Vorobyov said.