LONDON, July 17 (Reuters) - U.S. company Westinghouse

said South Korea's KHNP is not authorised to use its reactor

technology for a tender to build Czech nuclear projects without

its agreement.

The Czech government on Wednesday picked Korea Hydro &

Nuclear Power (KHNP) over rival French bidder EDF to build two

nuclear power units after a lengthy tender process.

Westinghouse said KHNP had failed to comply with U.S. export

rules that require authorisation from the U.S. government before

its technology can be shared.

"Westinghouse reserves its rights to challenge this in front

of the relevant national and international jurisdictions," it

said in an emailed statement.

KHNP did not provide immediate comment.