"By utilizing the swap agreement, the Bank of Japan would be prepared to provide liquidity in Renminbi in the event that Japanese financial institutions face unexpected difficulties in Renminbi settlements, and the Bank judges the liquidity provision to be necessary for ensuring the stability of Japan's financial system," the BOJ said in a statement.

($1 = 113.67 yen)

(This story corrects dollar conversion to $30 billion, not $386 trillion, in 1st paragraph)

(Reporting by Leika Kihara; Editing by Giles Elgood)