maintenance for 21% of the year (an upper limit). • Power interruption due to eclipses for the entire day for all days during which an eclipse occurs (90 days). [The SPS is unlikely to be economically attractive under these circumstances; worst case.] The magnitude of the installed reserve under each of the indicated conditions is entered in Table 2.2. The difference between the entry of interest and the entry for the power pool which does not contain an SPS is the extra installed margin that is required by the SPS. For example: If a power pool, which has a peak power demand of 50 GWe contains no SPS, only 10 to 11 GWe's of installed margin (60 to 61 GWe's total) is required to provide for system reliability. If this same power pool contains an SPS which must be shut down for scheduled maintenance, 12 to 13 GWe's of installed margin is required. The power pool which contains an SPS needing scheduled maintenance requires two more gigawatts of generating capacity than does the power pool that contains no SPS. If the SPS needs no schedule maintenance, only one more gigawatt of generating capacity would probably be needed (11 - 12 GWe minus 10 - 11 GWe). The results of these calculations indicate that if one or more 5 GWe generators (SPS, nuclear or fossil fuel) are installed in a power pool, the installed generating margin must be increased if the system reliability is to be maintained. The amount of the increase depends on the size of the power pool; the larger the power pool, the smaller the required increase. To demonstrate how the installed margin must vary with the power pool size, the percentage installed margin is plotted as a function of the power pool size in Figures 2.6, 2.7 and 2.8. The
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