An initial inspection interval is established to insure detection of any premature primary element failure.  The initial inspection interval is dependent on the particular geometry and degree of inspectability, as given in Table 1.3.5.  The initial inspection interval should not be greater than one half of the time to primary load path failure from the specified initial flaw for primary elements plus one half of remaining time to failure of adjacent structure from its flaw size at the time of primary element failure.  These initial flaw sizes are specified in Section 1.3.4.

Subsequent inspection intervals are also based on the degree of inspectability of the primary element as given in JSSG-2006 Table XXXIV and repeated in Table 1.3.6.