Toshiba Corp.'s Westinghouse Electric and India are in "advanced discussions" for the company to build six nuclear reactors there, the country's ambassador to the United States said on Wednesday, ahead of India Prime Minister Narendra Modi's planned visit to Washington next week.

A deal with Westinghouse would be the first such contract reached under the 2008 U.S.-India civil nuclear accord.

"There is a very detailed and advanced negotiation between Westinghouse and India," Ambassador Arun Singh told reporters. "The issues that remain to be worked out are related to cost and financing."