15.7. Passive reactor plants have about one-half the electrical generating capacity of present large units. It is felt that such smaller units are more practical for medium-sized utilities that wish to increase their capacity than the large units. Generally, a generating unit should be no larger than about 15 percent of a utility system capacity. Therefore, worldwide market con­siderations favor a smaller standard plant. Since smaller units lend them­selves to a greater degree of standardized factory manufacturing than large units, cost savings are likely. Another consideration is that smaller plants contain less radioactive material and are easier cooled. Some level of risk reduction therefore results.