# Keff parameters

**URL:** <https://openmc.discourse.group/t/keff-parameters/6343>\
**Category:** User Support\
**Created:** [May 30, 2026, 3:54pm UTC](https://openmc.discourse.group/t/keff-parameters/6343 "2026-05-30T15:54:46Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DinaEl](https://avatars.discourse-cdn.com/v4/letter/d/77aa72/32.png) [@DinaEl](https://openmc.discourse.group/u/DinaEl)\
**Post date:** [May 30, 2026, 3:54pm UTC](https://openmc.discourse.group/t/keff-parameters/6343/1 "2026-05-30T15:54:46Z")

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Hello everyone  
I want to ask what parameters in an OpenMC model can be modified to increase the effective multiplication factor (keff) and bring it closer to 1  
and thanks