# Burnup calculation problem

**URL:** <https://openmc.discourse.group/t/burnup-calculation-problem/1048>\
**Category:** User Support\
**Created:** [March 7, 2021, 9:44am UTC](https://openmc.discourse.group/t/burnup-calculation-problem/1048 "2021-03-07T09:44:12Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![imtiaj\_hossain](https://avatars.discourse-cdn.com/v4/letter/i/90db22/32.png) [@imtiaj\_hossain](https://openmc.discourse.group/u/imtiaj_hossain)\
**Post date:** [March 7, 2021, 9:44am UTC](https://openmc.discourse.group/t/burnup-calculation-problem/1048/1 "2021-03-07T09:44:12Z")

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Hi,  
I want to calculate up to a burnup of 20 MWd/kgHM. 50steps of 0.2MWd/kgHM & 10steps of 1.0MWd/kgHM. How can i do this successive depletion calculation? Will one integration after another do?

Thanks  
-Imtiaj

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<div class="post-metadata">

**Author:** ![imtiaj\_hossain](https://avatars.discourse-cdn.com/v4/letter/i/90db22/32.png) [@imtiaj\_hossain](https://openmc.discourse.group/u/imtiaj_hossain)\
**Post date:** [March 8, 2021, 4:37am UTC](https://openmc.discourse.group/t/burnup-calculation-problem/1048/3 "2021-03-08T04:37:48Z")

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Thank you julius.

openmc.deplete.SICELIIntegrator works well.

-Imtiaj

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**Author:** ![Julius](https://avatars.discourse-cdn.com/v4/letter/j/ecd19e/32.png) [@Julius](https://openmc.discourse.group/u/Julius)\
**Post date:** [March 9, 2021, 2:19pm UTC](https://openmc.discourse.group/t/burnup-calculation-problem/1048/4 "2021-03-09T14:19:30Z")

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Please,disregard my previous comment.I suggest you do it this way

[Depletion by burnup](https://github.com/openmc-dev/openmc/issues/1410#issuecomment-584233603)

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<div class="post-metadata">

**Author:** ![imtiaj\_hossain](https://avatars.discourse-cdn.com/v4/letter/i/90db22/32.png) [@imtiaj\_hossain](https://openmc.discourse.group/u/imtiaj_hossain)\
**Post date:** [March 9, 2021, 3:23pm UTC](https://openmc.discourse.group/t/burnup-calculation-problem/1048/5 "2021-03-09T15:23:29Z")

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Yeah thanks again. I was also facing problem cz it was a array not successive burnup. so i tried spending more time on openmc documentation. Thank u.

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**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:** [March 18, 2021, 11:46am UTC](https://openmc.discourse.group/t/burnup-calculation-problem/1048/6 "2021-03-18T11:46:16Z")

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It sounds like you’ve already figured it out, but for posterity, the easiest way to do this would be:

```auto
timesteps = 50*[0.2] + 10*[1.0]
integrator = Integrator(operator, timesteps=timesteps, timestep_units='MWd/kg')

```

where `Integrator` is really one of the various [integrator classes](https://docs.openmc.org/en/latest/pythonapi/deplete.html#primary-api). As you’ve noted, the values are not cumulative.