* One of 3 CDUs at the plant shut down
* Some secondary units also shut (Adds details)
TOKYO, July 1 (Reuters) - Japan's Exxon Mobil group refiner TonenGeneral Sekiyu KK said it shut one of its three crude distillation units (CDUs) after lightning hit the 335,000 barrels per day Kawasaki plant, near Tokyo, around 4 p.m. (0700 GMT) on Thursday.
Some other secondary units were also shut down, but there were no injuries, the company said in a statement.
The plant, located near Tokyo, has three CDUs, the 67,000 bpd No.1 unit, the 185,000 bpd No.2 unit and the 83,000 bpd No.3 unit, but a company spokesman declined to specify which one of these was shut down.
There was a small fire at one of the power transformers but it was extinguished by around 6:35 p.m., the company said.
The spokesman declined to comment on whether a 28,000 bpd residue hydrocracking unit (RHCU), which converts residue, a very heavy fuel, into semi-finished products for further processing into fuels such as gasoline and distillates, was shut. (Reporting by Osamu Tsukimori; Editing by Edwina Gibbs)