Roderick said a Westinghouse team was already in India to negotiate the deal, but talks were likely to go down to the wire, as the crucial issue of nuclear liability insurance for suppliers remains unresolved.
The aim, however, was to make a "commercially significant announcement" during Modi's expected US visit in March and sign a final contract later in the year, Roderick said, narrowing the timeline on a deal that an Indian official had said would be disclosed by June.
The contract would give a big boost to India's $150-billion nuclear power programme, and a broader push to curb greenhouse gas emissions.
"We need to see the details of the insurance company and how the insurance will work at a level beyond what we have seen so far," Roderick said in an interview. "And that needs to happen in the next 30 to 45 days."
India has launched an insurance pool with a liability cap of Rs 1,500 crore (about $222 million) to assuage suppliers' concerns, after a 2010 law gave the state-run operator Nuclear Power Corporation of India Ltd the right to seek damages from them in the event of an accident.
Roderick said while the concept gave Westinghouse confidence to go ahead with a potential deal, the company still needed details of how the liability scheme would work before it can agree on commercial terms.
The NPCIL did not respond to requests for comment on the deal, which was put on the fast-track when President Barack Obama visited India in January last year. The Westinghouse deal would be the first nuclear commercial power project since the US and India first struck an agreement to cooperate in the civil nuclear arena a decade ago, and would underscore a growing strategic partnership between the world's two largest democracies.
A foreign ministry spokesman declined to comment on Modi's travel plans.
A US diplomat, however, said the US had invited Modi to the March 31-April 1 Nuclear Security Summit and that Washington was thinking of turning the trip into a full-fledged official visit, which would give the Indian leader a similar reception as Chinese President Xi Jinping.
India has given two sites to US companies - Westinghouse and a nuclear venture between General Electric (GE) and Hitachi - to build six reactors each.
In December, an Indian official told Reuters that GE had yet to decide on whether it would move ahead with the plan.
Spokesman Christopher White said GE was still interested, but added that the March timeframe was "totally dependent on the finalisation of the insurance plan".
Roderick said that if the GE-Hitachi deal did not eventually go through, Westinghouse would rather the Indian government gave it the site than "Russia or somebody else".
He said that while Modi's office was driving the deal, other government authorities also had to hasten the process. "It is just going to take everyone deciding to have this done by March," Roderick added.
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