FISSION GAS TREATMENT IN THE EUROPEAN ACCIDENT CODE-2
Several types of fission gas treatments are necessary for a whole-core LMFBR accident analysis code such as the European Accident Code 2 (EAC2). In this code system a consistent pre-accident irradiation and transient treatment of the inter- and intra-granular gas in the solid fuel is achieved through the use of the mechanistic LAKU fission gas behaviour model. An efficient version is currently being coupled to the TRANSURANUS fuel behaviour code which is used in EAC2. The treatment of fission gas in solid fuel helps to predict fuel swelling which adds to the cladding loading, and also helps to predict fuel fragmentation through grain boundary cracking. The fuel which melts experiences a rapid release. In the CAMDYN in-pin motion model of EAC2 a separate treatment of the partially and fully molten fuel is performed. In both fuels small (surface tension bound) and large bubbles that cause the molten cavity pressure are treated. Fuel ejected into the coolant channels is treated by the MDYN model which also considers small and large bubbles. The coalescence of the small bubbles is currently based on a radioactive decay law.
Bibliographic Reference: FISSION GAS BEHAVIOUR IN SAFETY EXPERIMENTS, CADARACHE/F, DEC. 10-11, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII/A2, BP 1907, MENTIONING PAPER ORA 33783 E
Availability: Can be ordered online
Record Number: 1989126094800 / Last updated on: 1989-05-01
Available languages: en