| Popis: |
The early expansion of the fuel following disassembly in an LMFBR core disruptive accident is modeled. Spherical expansion in the sodium is assumed. A Lagrangian, finite-difference hydrodynamic code (FEXPAN) describes the motion. Disassembly employs VENUS-II, and a consistent equation of state for fuel was used throughout disassembly and FEXPAN. Time-dependent mechanical work and fuel vaporized without fuel mixing are obtained. FEXPAN is compared with time-independent expansion for the effect of fuel mixing. For example, for a particular accident analysed 75 MW sec mechanical work was calculated for expansion with no mixing versus 10 MW sec with complete core mixing. |
