In Chapter 26, Owen F. Hedden provides an overview of the stipulations of Section XI, Rules for Inservice Inspection of Nuclear Power Plant Components. A chronological overview of the development of Section XI is presented, from its inception in 1968 up to the 1998 Edition. The chapter traces the development, Edition-by-Edition, of important elements of the Code, including the philosophy behind many of the revisions. Emphasis is placed on the 1989 through 2004 Editions, for they apply to the majority of plants in the United States and elsewhere. Through an extensive tabulation of Code Interpretations, this chapter also attempts to...