BRUSSELS, Belgium (AP) _ Consumer prices in the 12 European Economic Community nations rose 0.3 percent in February, the EEC's statistics agency Eurostat reported Friday.

The agency also reported that prices were up 3 percent from February 1986 for the first increase in the year-to-year inflation rate in five months.

For the year to February, West Germany, the Netherlands and Luxembourg had negative rates of inflation of 0.5 percent, 0.9 percent and 0.5 percent respectively, according to Eurostat.

For the other countries the annual inflation rates last month, according to Eurostat, were: France, 3.4 percent; Italy, 4.3 percent; Belgium, 1 percent; Britain, 3.9 percent; Denmark, 4.7 percent; Greece, 16.8 percent; Spain, 6 percent and Portugal, 9.5 percent. Eurostat offered no inflation rate for Ireland.

It said the inflation rates of Spain and Portugal have fallen significantly since these nations joined the EEC Jan. 1, 1986. Spain's annual inflation rate was 9 percent in February, 1986 and Portugal was 12.6 percent.