JAPAN NUKE CRISIS : ACCIDENT RATING UPGRADED TO SAME AS CHERNOBYL//BASE METALS TRADES FLAT COPPER LTP 438.45 SUPP 436 RES 443/NICKEL LTP1232 SUPP 1215 RES 1243/ LEAD MARGINALLY WEAK ALU AND ZINC HOLDING//CRUDE SLIPS FURTHER $108.25 NAT GAS MARGINALLY UP//BULLIONS MARGINALLY WEAK//IMF CUTS FORECAST OF CRUDE OIL CONSUMPTION AFTER JAPAN QUAKES//