# Burn Up Level vs Operation time graph

**URL:** <https://openmc.discourse.group/t/burn-up-level-vs-operation-time-graph/1497>\
**Category:** User Support\
**Created:** [October 22, 2021, 4:00am UTC](https://openmc.discourse.group/t/burn-up-level-vs-operation-time-graph/1497 "2021-10-22T04:00:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![anas](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/anas/32/1194_2.png) [@anas](https://openmc.discourse.group/u/anas)\
**Post date:** [October 22, 2021, 4:00am UTC](https://openmc.discourse.group/t/burn-up-level-vs-operation-time-graph/1497/1 "2021-10-22T04:00:42Z")

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Hello everyone,

I wanna ask about burn up calculation,  
how to create graph in openmc that shows burn up level vs operation time?

Thanks,  
Anas

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**Author:** ![abdel\_laouzi](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/abdel_laouzi/32/1021_2.png) [@abdel\_laouzi](https://openmc.discourse.group/u/abdel_laouzi)\
**Post date:** [October 31, 2021, 2:31pm UTC](https://openmc.discourse.group/t/burn-up-level-vs-operation-time-graph/1497/2 "2021-10-31T14:31:13Z")

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hey anas this is how you get the concentration of u235 with burnup time .  
u can write this in the same file where you have your main program .

 ![image](https://global.discourse-cdn.com/free1/uploads/openmc/original/2X/3/3e8a22dfb121a7a9d1d5da499a11aaf1c8651d55.jpeg)

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**Author:** ![anas](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/anas/32/1194_2.png) [@anas](https://openmc.discourse.group/u/anas)\
**Post date:** [November 1, 2021, 1:52am UTC](https://openmc.discourse.group/t/burn-up-level-vs-operation-time-graph/1497/3 "2021-11-01T01:52:30Z")

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Thank you abdel, but i wanna plot core time operation (years) in x axis and burn up level (MWd/Kg) in y-axis. I don’t know how to do that. I hope you can help me 🙂

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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:** [November 3, 2021, 1:21pm UTC](https://openmc.discourse.group/t/burn-up-level-vs-operation-time-graph/1497/4 "2021-11-03T13:21:02Z")

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You’ll have to do some small calculation.Burnup unit in OpenMC is ‘s’.you are also providing power density. After the depletion calculation u’ll be able to get time from result file. After that burnup is (MWd/KgHM)

B=( P\*time/(seconds in a day))/(fuel weight)

After that u can simply plot B in X axis & time in Y axis.  
Hope this helps.

-Imtiaj