Improved treatment of molten fuel inside LMFBR pins and its effect on the pin mechanics calculation
A new model has been developed for treating the behaviour of the molten fuel and fission gas inside the molten cavity of a LMFBR pin, undergoing an unprotected Loss-of-Flow (LOF) or Transient Overpower (TOP) accident. The new model named CAMDYN (Cavity Material Dynamics) has been coupled to the fuel pin performance code TRANSURANUS. The basic modelling approach of CAMDYN consists of the treatment of two coupled one-dimensional flows. One describes the motion of the fully molten and the other the motion of the partially molten fuel. The coupled TRANSURANUS/CAMDYN code system has been tested against the CABRI in-pile experiments AIR and A3. A significant negative reactivity feedback due to prefailure in-pin fuel motion is calculated for a hollow pellet pin design.
Bibliographic Reference: Paper presented: International Conference on Fast Reactor Core and Fuel Structural Behaviour, Inverness (GB), June 4-6, 1990
Availability: Available from (1) as Paper EN 35764 ORA
Record Number: 199011611 / Last updated on: 1994-12-02
Original language: en
Available languages: en