Decay data for Pm-149 missing

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Decay data for Pm-149 missing

Postby thennigh » Fri Jun 26, 2015 7:24 pm

I have been using serpent 1.1.17 to calculate decay heats for spent fuel and comparing the results for individual isotopes with decay heats from origen. Most of the isotopes produced nearly the exact same decay heat using serpent and origen, however the decay heat for Pm-149 was nearly twice as high in the serpent output as compared with origen. I looked at the serpent decay library (sss_endfb7.dec) in the Pm-149 section and it appears that there is some data missing from this section. I also looked at the origen decay library and ENDF/B-VII.1 and found good agreement between these sources.
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Re: Decay data for Pm-149 missing

Postby Jaakko Leppänen » Fri Jun 26, 2015 9:58 pm

Have tried with the other decay libraries, for example, JEFF-3.1?
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Re: Decay data for Pm-149 missing

Postby thennigh » Fri Jun 26, 2015 10:19 pm

Yes. The other libraries have the data for Pm-149 and I can use them to get good results. I just thought it was worth mentioning that it was incomplete in sss_endfb7.dec
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Re: Decay data for Pm-149 missing

Postby Jaakko Leppänen » Sat Jun 27, 2015 9:11 am

OK. I'll look into this to see if the problem is in the data or in processing. Thanks!
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Re: Decay data for Pm-149 missing

Postby Jaakko Leppänen » Sat Jun 27, 2015 9:41 am

What exactly do you mean by missing data in the decay file? Have you tried running the Serpent calculation with the ENDF/B-VII.1 decay file? The decay data read by Serpent is a regular ENDF format file, so you should be able to use that in the calculation. Do you have ENDF/B-VII.0 data for Origen for comparison to Serpent with ENDF/B-VII.0?
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