#### Q1: In terms of these HALEU/HBU evaluation, what is the most important difference between PWRs and BWRs?
A: Why.
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A1: PWRs designs up to 8% enrichment are fairly straightforward whereas BWRs designs are more complex. The prototype BWR designs developed in this phase had a maximum of 10% enrichment. At high burnup, the difference between the 56-group and 252-group library is more pronounced for the BWR than it was for the PWR, reaching 300 pcm in some cases, which although still fairly low, does exceed the 200 pcm target for differences between libraries.
