I am currently working on a research reactor core design using Serpent 2.1.24. We are doing equilibrium core search and the "set opti" card is considered to reduce memory consumption.
The problem is the k-effs with different "opti" mode are very different. For your information, I used the ENDF/B-VII.1 library (converted from MCNP6 library to Serpent library) and we generated our own S(a,b) library based on ENDF/B-VII.1 too. In the input, the tms option is used to treat the temperature-dependent cross-sections of all materials. The new s(a,b) on-the-fly interpolation capability is also used for the water and beryllium reflector.
These are the k-eff results at clean core with different "opti":
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Opti_1_res.m:ABS_KEFF (idx, [1: 2]) = [ 1.19948065E+00 0.00043 ]; Opti_2_res.m:ABS_KEFF (idx, [1: 2]) = [ 1.11664997E+00 0.00051 ]; Opti_3_res.m:ABS_KEFF (idx, [1: 2]) = [ 6.09881387E-01 0.00073 ]; Opti_4_res.m:ABS_KEFF (idx, [1: 2]) = [ 1.11565342E+00 0.00039 ];