# Rates over time

**URL:** <https://openmc.discourse.group/t/rates-over-time/1185>\
**Category:** User Support\
**Created:** [May 6, 2021, 5:46pm UTC](https://openmc.discourse.group/t/rates-over-time/1185 "2021-05-06T17:46:45Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Javier\_Gonzalez](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/javier_gonzalez/32/1095_2.png) [@Javier\_Gonzalez](https://openmc.discourse.group/u/Javier_Gonzalez)\
**Post date:** [May 6, 2021, 5:46pm UTC](https://openmc.discourse.group/t/rates-over-time/1185/1 "2021-05-06T17:46:45Z")

</div>

Hi all,

In a depletion analysis, I wish to know the fission rate in a single nuclide over time. I used:

results = openmc.deplete.ResultsList.from\_hdf5(“depletion\_results.h5”)  
fission = results.get\_reaction\_rate(“1”,”U235”,”fission”)

I noted that the fission values are multiplied by 1e15. In this case, are the fission rate units “reactions per source particle” or are they internally converted?

Thanks,  
Javier

---

<div class="post-metadata">

**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\
**Post date:** [June 2, 2021, 4:54am UTC](https://openmc.discourse.group/t/rates-over-time/1185/2 "2021-06-02T04:54:12Z")

</div>

@Javier_Gonzalez Yes, the reaction rates that appear in a depletion results file have already been normalized, so they should be in units of reactions/sec.