Well USA is not insisting that India should close its Reactors which are producing Material for Nuclear weapon program.
All it is insisting is >> We should not divert any of material imported under this deal to Weapon making facilities.
That means we are free to mine our own uranium and use it for our own weapon program and only Condition is the case when we detonate that device, than US has to think what to do >> Cancel the deal or keep mum.