Oct 3 (Reuters) - U.S.-based energy equipment supplier

Holtec International has filed a joint lawsuit with two other

firms against accounting firm CBIZ ( CBZ ) and its senior

executive Lonnie Davis, the company said on Thursday.

The company also alleged business misconduct, including

fraud, breach of contract and accounting malpractice, against

CBIZ ( CBZ ) and two former Holtec executives, Chief Financial Officer

Robert Galvin and General Counsel Andrew Ryan.

The privately held nuclear technology solutions company with

operations in the U.S. as well as Brazil, Mexico and Japan,

among others, claimed the executives "secretly co-founded and

owned a rogue, self-dealing company (CBIZ Consulting) using a

deceptively similar name...to Holtec's accounting firm CBIZ ( CBZ ), to

siphon funds from Holtec".

CBIZ Consulting has been accused of embezzling funds of

about $70 million, according to Holtec.