Partial MLSB / Density and beta "mox" effects

Density and beta "mox" fuel effects

(cf rtvunsym_6.dat )

Difference|base case: rtvunsym_(6|2)

betag= .005 |.0076

rog= .11853, 0 | .098775, 0:
density reactivity effects (rog) augmented by 20%

Surprisingly, the results (chart 01) are barely more severe because the q2c peak appears earlier, at 52 s | 60 s, but its level is lower: 740e6 | 770e6 whilst

u2c7 peak (chart 02) is moderately higher: 770 | 740

It is also instructive to observe that this "mox" case behaves more as a fast reactivity transient: roc increase is halted when it just reaches betag = .005, whilst, for the base case roc turns over at .00637 slightly below prompt criticality level of .0076. This may explain why as feedback's develop earlier, q2c peak is lower.