ASTEC–MAAP Comparison of a 2 Inch Cold Leg LOCA until RPV Failure
Table 3
Phenomenological windows identified and dominant driving phenomena investigated.
Phase no.
Phase name
Phenomena considered as a Figure of Merit for code comparison
1
RCS depressurization
Break flow Single and two phase natural circulation Heat transfer in SG Loop seal formation and clearing Steam voiding in RCS Phase separation in RCS Core uncovery Core heat-up Cladding oxidation and hydrogen generation Core damage
2
Accumulator discharge
Accumulator discharge rate and duration Core reflooding and quenching
3
Core heat-up and relocation to lower plenum
Core heat-up Cladding oxidation and hydrogen generation Molten pool formation in the core and coolability Core relocation to lower plenum
4
Debris bed in lower plenum
Debris bed behaviour in lower plenum RPV lower head failure
