Nilgiri
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Number of warheads are just speculation, we have never disclosed the number of warheads that we have.
Full disclosure is not needed. One can easily do the calculation from the production rate of the military reactors times time factoring in the enrichment rate - numbers which are well known.....numbers such as the breeding/conversion ratios for breeder reactors. Refer to: http://www.princeton.edu/~aglaser/2007aglaser_sgsvol15.pdf
The larger reactor grade material only comes into play if one is to assume India has developed the technology and expertise to develop this material into a bomb. IIRC only one such reactor grade Pu test was done by the US in 1962 and the results are secret to this day. Changing the reactor grade material to weapons grade is not a simple case like that of Uranium given the inverted difference in burnup time and reprocessing costs involved with this...since there is no cheap way to remove the Pu-240 and other isotopes found in reactor grade Pu. Basically from the base state Uranium, the longer the irradiation time the greater the build up of "undesirable" Pu-240. So it is always way more feasible to specifically produce weapons grade Pu.
Basically:
Uranium ---irradiation + reprocessing + short time-----> Weapons grade Pu
Uranium-------irradiation+reprocessing + much longer time-----> Reactor grade Pu
It is not easy to change reactor grade to weapons grade because of this....unlike fissile uranium where you simply enrich to the weapons grade level from a reactor grade.