"India has a substantial stock of nuclear weapons made from weapon-grade plutonium, and perhaps some thermonuclear weapons that rely on both weapon-grade plutonium and weapon-grade uranium," according to the Institute for Science and International Security (ISIS).

"An estimate of India's nuclear arsenal can be derived by considering its weapon-grade plutonium stock," it said.

"The resulting estimate has a median of 138 nuclear weapons equivalent with a range of 110 to 175 weapons equivalent." However, the actual number of nuclear weapons India built from its stocks of weapon-grade plutonium must be less, ISIS said.

"When accounting for the amount of plutonium in the weapons production pipelines and in reserves, it is reasonable to assume that only about 70 percent of the estimated stock of weapon-grade uranium is in nuclear weapons," it said.

"Thus, the predicted number of weapons made from its weapon-grade plutonium at the end of 2014 is about 97 with a range of 77-123," ISIS noted.

"These values are rounded to 100 nuclear weapons with a range of 75-125 nuclear weapons”, it added

The think tank also noted that India has one of the largest nuclear power programmes among developing nations. Utilising plutonium produced in these power reactors and discharged in irradiated or spent fuel, India has developed a relatively large civil plutonium separation programme and an associated fast breeder reactor programme that is using that separated plutonium, the report said.

For its "sizeable nuclear weapons effort", ISIS said, India uses "separated plutonium produced primarily in a set of small, dedicated reactors and a smaller amount produced in nuclear power reactors."

"It has a growing gas centrifuge programme able to produce significant amounts of highly enriched uranium (HEU) mostly for naval reactor fuel and perhaps for nuclear weapons, including thermonuclear weapons," it added.

Despite many obstacles, India has managed over several decades to put in place a relatively large nuclear weapons production complex, the report said."Its current complex can produce plutonium and highly enriched uranium for nuclear weapons and nuclear powered submarines," ISIS said.

"It has a sophisticated missile production complex that provides the delivery systems for its nuclear weapons."

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