You are mistaken. It is not a thorium reactor producing Pu. Or more accurately, Thorium fuel cycle transmutes Th232 to U233. No Pu.
What India is doing at FBR is to use U/Pu mix to generate more Pu. Add Th in the mix and get fissile U233. That is, FBR is not a thorium reactor, and Thorium cycle doesn't generate Pu.
Thorium fuel cycle - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/India%27s_three_stage_nuclear_power_programme#Stage_II_.E2.80.93_fast_breeder_reactor
No question of my being mistaken ...I have clearly stated that the excess production of Weapon grade plutonium is possible within confines of 3 stage nuclear programme.
I am not talking about any single reactor but all 3 stages of Indian Nuclear programme that means PHWR , FBR,AHWR will complete the fuel cycle ...and all 3 stages working in sync will improve fuel efficiency tremendously ....
The misunderstanding has arisen because you have seen functioning of these reactors in isolation - stand alone mode ....
Read the abstract I quoted ....and full article with the link below ....
It clearly shows various refueling strategies .....whereby India will be able to divert huge amount of Plutonium ...
all this is possible within confines of 3 staged nuclear programme .....
which is Indian ingenuity .....
I hope you understand what I am trying to say !
Don't believe me ...but see it's Dr MV Ramanna and Dr Glasier who have proved it with their succinct analysis ....Please see the presentation and article I quoted earlier