BWR is a boiling water reactor PWR is a Pressurised water...

BWR is a boiling water reactor
PWR is a Pressurised water reactor, similar to those used in ships/submarines

http://www.nnl.co.uk/media/1052/bwr_position_paper_-_final_-_web.pdf

Fuel Cycle Implications
Mining
The fuel discharge burnups and throughputs for a BWR are similar to those seen in a PWR and so the mining requirements in terms of TWhe per kg of mined yellowcake (U3O8) are similar.

Enrichment
Again, the fuel enrichment requirements are
broadly equivalent between the BWR and PWR
although the BWR fuel requires a larger number of
fuel enrichments within each assembly.

Conversion and Fuel Manufacture
Similar again for both BWR and PWR in termsof conversion volume requirements and intermediates going from U3O8 to enriched UO2.
The fuel manufacturing route is of course different given the more heterogeneous nature of the BWR fuel, the inclusion of a fuel shroud for each BWR assembly and the inclusion of part length rods
and water channels.

Irradiation
BWRs can operate with enriched non-irradiated or reprocessed uranium fuel and Mixed plutonium/uranium OXide (MOX) fuels in the same manner as PWRs.

Reprocessing
If a closed fuel cycle is adopted, BWR fuel is fully capable of being reprocessed, in the same way as PWR fuel.
There is extensive global experience of both reactor types operating in closed fuel cycles.

Disposal
If a reprocessing route is followed, the optimal long term disposal route for the fuel waste streams is fit for purpose for both PWR and BWR fuel (i.e. cementation of ILW, vitrification of HLW followed
by geological disposal in a repository).
If an open fuel cycle is adopted, then BWR fuel can be stored in the same way as PWR fuel.
Similarly, direct disposal of BWR fuel is comparable to that of PWR fuel.

“BWR fuel assemblies are more heterogeneous than PWR fuel, with several different fuel rod types within a single assembly (cf. one or two rod types in standard PWR fuel

https://www.gov.uk/government/publi...ions-assessment-of-hitachi-ges-uk-abwr-design