The Soviet Union plans to double its industrial output in the next 15 years, with most of the growth coming from an increase in labor productivity.

These goals -- central to Soviet leader Mikhail Gorbachev's planned revitalization of the Soviet economy -- were outlined in a draft version of the nation's 12th five-year plan, published tonight by the Soviet news agency Tass.

The proposed plan, to run from 1986 to 1990, along with goals set for the year 2000, was approved at a plenum of the Communist Party's Central Committee last month. It will be adopted formally next February at the 27th party congress.

Under the Soviet Union's centralized economy, the plan determines the nation's economic course in all its aspects -- from the rate of growth in capital investment to the number of shoes to be produced by 1990 (the goal is 900 million pairs).

Coming before the end of Gorbachev's first year in power, it also will be one of the key levers in his campaign to improve the economy, boost technological progress and exact the kind of work needed from the Soviet labor force.

"The 12th five-year period is to beome the turning point in the economic and social development of the U.S.S.R. in every respect," the plan says.

Without giving any figures or percentages, the plan makes passing reference to an increase in military spending: "In view of the aggravation of the international situation, the U.S.S.R. has had to make additional efforts to maintain its defense capability at an adequate level so as to guarantee a life of peace for the Soviet people."

The draft plan criticizes the recent slowdown in the Soviet economy, which it blames on a failure to switch to "intensive" production and restructure management methods.

For several years, Soviet planners have been trying to shift the country onto "intensive" growth, away from the "extensive" use of labor and resources that helped fuel growth rates in earlier years.

In the 1980s, the growth in the Soviet economy has leveled off at about 3 percent a year. In a major speech this spring, Gorbachev said a 4 percent annual growth rate was the minimum required now.

In calling for a 150 percent increase in labor productivity by the year 2000, the new plan recalled recent campaigns against alcoholism and appeals for greater labor discipline.

Tonight's report gave no specifics on economic incentives for harder work, or on loosening restrictions impeding private economic activity. However, the plan does propose more than doubling productivity in the services industry, now in heavy competition with black market repair shops, auto mechanics, apartment renovators and other private-sector service providers.

In the next five years, the plan envisions an increase of up to 15 percent in average wages for factory and office workers, and up to 20 percent for farm workers. The average monthly wage is now approximately 190 rubles, or about $230 at the official Soviet exchange rate.