Four ex-Halliburton employees have accused the engineering and construction company of systematic accounting fraud over several years. They claim engineering unit Kellogg Brown & Root inflated its results by artificially boosting revenues or understating expenses.
Halliburton has denied the charges.
At least four people were killed and seven injured in an accident at the Milhama nuclear plant in Japan earlier this month. Steam exploded from a turbine in the number three reactor. Although it was the country's worst nuclear plant accident, there was no radiation leak. Kansai Electric Power is investigating the cause but suspects a ruptured pipe.