If we know the neutron flux value for a given reactor power when we upgrade the reactor for a high level power can we predict the new neutron flux value from the past value
For example
For a given nuclear reactor power of 100 MWt the corresponding total flux is 4.3E15(n/cm2.s) when it is upgraded to 140 MWt can we predict directly the total flux value
The power is the integral of the flux multiplied by the energy released by a single fission times the macroscopic fission cross section over both space and energy. The relationship between power and flux is linear provided the fission cross section does not change with the flux level. This is not true for power reactors mainly due to xenon and thermalhydraulic feedback.
BTW, if one uses the prompt power released by a single fission (i.e. approx 180 Mev), one obtains the prompt power. If one uses the total power released by a single fission (i.e. approx 200Mev = 180 MeV prompt + 20 MeV delayed) then one obtains the total power.
Yes, one can predict the new flux level of any reactor from the power value, provided different space parameters of the reactor.
It depends-...If reactor configuration (Like geometry and material) is not changed while upgrading then, new flux level can be directly deduced from previous power but, while in most upgrades you change either geometry or/and material for achieving new power, you need to re-calculate new flux using proper nuclear tools.
Sana's avswer above is closest to what İ was going to reply to your question except that enrichment & # of assemblies may required to chnge ( as in geometry) like converting of hi enriched to 20% enriched research reactor cores. What İ am trying to say is that you need to iterate all changed parameters in orderto match the previous core conditions if you are ugrading the power or downgrading the average enrichment.
Relation between reactor power and neutron flux can be read/calculated in file attached.
Yes dear Muzaffer, that is what I mean by material...Importantly if the reactor is already upgraded, the flux distribution analysis must be available in New FSAR, she can get required value from New FSAR, if she is interested in the flux value, as looks from her question.
I recommend you to read bellow chapter:
Chapter Improving the Performance of the Power Monitoring Channel
- Badges
- Science topic
- Similar topics
- Computer Science and Engineering
- Artificial Intelligence