* Nansei says to decide on Saturday whether to close refinery
* Typhoon Songda heading directly for Okinawa - Nansei spokesman (Adds detail)
TOKYO, May 27 (Reuters) - Japanese refiner Nansei Sekiyu KK, wholly owned by Brazil’s state-run Petrobras , said it would decide on Saturday whether to shut its 100,000 barrels per day Nishihara refinery in Okinawa, southwestern Japan, due to a typhoon.
Typhoon Songda is headed directly to Okinawa with strong winds, a Nansei Sekiyu spokesman said.
Japanese maritime authorities have instructed Nansei to suspend berthing operations from 9 a.m. (0000 GMT) on Saturday, the spokesman added. (Reporting by Osamu Tsukimori; Editing by Joseph Radford)