The UN nuclear watchdog, the International Atomic Energy Agency (IAEA), is set to approve a crucial nuclear deal between India and the US.
Correspondents say that approval is expected to be granted despite qualms about whether it rewards a non-proliferation outsider.
The IAEA's approval of the plan is a key condition for enacting it.
India's government Late wickets give Sri Lanka edge ...
Key party backs US-India nuclear deal ... recently survived a confidence vote over the deal, which it says is vital to meet energy demands.
The deal would allow India to enter the world market in nuclear fuel and technology - as long as it is for civilian purposes.
It had previously been banned from doing so under the terms of a 30-year embargo imposed because of its testing of atomic bombs and refusal to join the global Non-Proliferation Treaty (NPT).
Correspondents say that if India gets IAEA approval, 14 of its 22 existing or planned reactors would come under regular IAEA surveillance.
India must then win an unprecedented waiver from the 45-nation Nuclear Suppliers Group (NSG) later in August which would allow it to trade in sensitive nuclear materials.
The deal must also be ratified by the US Congress.
Delhi is under pressure from Washington to sign the accord before the US presidential elections in November.
Under the terms of the accord, India would get access to US civilian nuclear technology and fuel.
In return, Delhi would open its civilian nuclear facilities to inspection - but its nuclear weapons sites would remain off-limits.
'Consultations'
Indian Foreign Secretary Shiv Shankar Menon is leading a team of officials in the Austrian capital, Vienna, to brief member countries of the IAEA and the NSG on the planned safeguards.
US Undersecretary of State for Political Affairs William Burns is also in Vienna for "consultations at the IAEA relating to the nuclear deal [with India]", according to State Department spokesman Sean McCormack.
The US restricted nuclear co-operation with India - which has not signed the 1972 Non-Proliferation Treaty (NPT) - after it first tested a nuclear weapon in 1974.
Critics of the deal fear assistance to India's civil programme could free-up additional radioactive material for bomb-making purposes.
(BBC)
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