Compensation for236U in the fuel of the VV�R-440

Supplemental Report on Nuclear Safeguards Considerations for the Pebble Bed Modular Reactor (PBMR)

“…• Some additional enrichment is required as well as extensive blending with either LEU from natural uranium or natural uranium to reduce 236 U to the standard specification (ASTM C787) considered necessary for light-water reactors [7][8][9][10] to achieve the same burnup as when using LEU from natural uranium.…”

“…Instead, Section 3.4 of Reference [4] states, without acknowledging, due to the reactivity penalty from 236 U, the need for blending with natural uranium and re-enrichment to the higher enrichments required to achieve the same burnup for current light water reactor fuel cycles [7][8][9][10].…”