Equation (4) is plotted in Fig. 5 for values of interest herein and a unit forced outage rate ro = 0.02. Now we can examine the addition of either large or small units to a lunar base power system. Assume that the lunar base power system consists of ten 100 kWe size nuclear generating units; the system load factor Lf is 0.7; and the system reserve is equal to 0.5 Pd. Then, from equations (1) and (3) we have: With the above as a starting point, we can use equation (4) and Fig. 5 to compare the two alternatives of adding either 100 kWe or 1000 kWe units to satisfy increasing power demand while maintaining the same reliability (LOLP) as the initial ten unit system. Table III illustrates this comparison for five stages of system growth with either 100 kWe and 1000 kWe additions. When the larger 1000 kWe units are first added, large increases in the system reserve are needed to maintain system reliability. However, fewer units are required to increase the system capacity to the point where a 2000 kWe average power demand (for a self sustaining base with CELSS) can be supplied reliably. When 1000 kWc units are added, 2000 kWc of demand can be supplied with 16 nuclear units (the initial ten 100 kWe units plus six added 1000 kWe units). By comparison, a total of 28 100 kWe units would be required to supply the
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