adjusting heavy water concentration in moderator

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Staffan F
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Re: adjusting heavy water concentration in moderator

Post by Staffan F » Mon Apr 12, 2021 3:04 pm

Thank you for your reply!
I will probably do a combination of the suggested methods. Another question which turns up is: from which version of Serpent 2 is the hisv-card availble. It seems like the intallation at my department of Serpent 2 does contain the hisv-card.

Ana Jambrina
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Re: adjusting heavy water concentration in moderator

Post by Ana Jambrina » Mon Apr 12, 2021 3:06 pm

Serpent 2.1.32
- Ana

lorenzoloi
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Re: adjusting heavy water concentration in moderator

Post by lorenzoloi » Wed Jun 02, 2021 10:59 am

Hello,
I have a similar question and I think that this topic is the right place.
I need to perform a criticality iteration considering boric acid as absorber, my question is: in the "iter nuc" card should I declare all the materials in boric acid or just the two boron isotopes?

The boric acid definition is the following:
mat boricacid -1.5 tmp 550
1001.03c -4.88918E-02
1002.03c -1-12378E-05
5010.03c -3.22250E-02
5011.03c -1.42617E-01
8016.03c -7.75941220E-01
8017.03c -3.13409E-04


Thank you!
Lorenzo

Ana Jambrina
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Re: adjusting heavy water concentration in moderator

Post by Ana Jambrina » Wed Jun 02, 2021 11:17 am

As mentioned in the Wiki: “The critical density iteration only works for nuclides that have a reactivity effect mainly through neutron absorption. Specifically, critical densities of fissile, moderating or reflecting nuclides cannot be reliably iterated using this card”. For further information, see: Critical density iteration.
(In this case: the two boron isotopes, B-10 and B-11. In any case, you would be interested in knowing the concentration of boron diluted in the borated water).
- Ana

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