This Standard sets forth the requirements for a calibration program to control and verify the accuracy of measuring and test equipment used to ensure that safety systems [5]1 of a nuclear facility are in conformance with prescribed technical requirements and that data provided by testing@ inspection@ or maintenance are valid. These requirements also cover modifications and those activities occurring during the operating phase that are comparable in nature and extent to related activities occurring during the initial construction of the facility.During the construction phase and when modifications are being performed@ this standard shall be used in conjunction with the applicable portions of ANSI/ASME NQA-1-1989 [2]2 and ANSI/ASME NQA-2-1989 [3] with respective addenda to and including ANSI/ASME NQA-1a-1989 and ANSI/ASME NQA-2a-1989 to the extent specified by the organization invoking this standard. During the operations phase this standard shall be used with the applicable portions of ANSI/ANS 3.2-1988 [1]3.Owners who are committed to ANSI/ASME N45.2-1977@ Quality Assurance Program Requirements for Nuclear Facilities@ and the appropriate ANSI/ASME N45.2 series of daughter standards4 may continue to follow the requirements given in those documents in lieu of those found in ANSI/ASME NQA-1 [2] and ANSI/ASME NQA-2 [3].1The numbers in brackets correspond to those of the references in Section 2.2ANSI/ASME publications are available from the Sales Department@ American National Standards Institute@ 1430 Broadway@ New York@ NY 10018@ U.S.A@ or the American Society of Mechanical Engineers@ Order Department@ 22 Law Drive@ Box 2300@ Fairfield NJ 07007-2360@ U.S.A: 3ANSI/ANS publications are available from the American National Standards Institute. 1430 Broadway. New York@ NY 10018@ U.S.A.@ or the American Nuclear; Society@ 555 North Kensington Park Ave.@ LaGrange Park@ IL 60525@ U.S.A.4Users should be advised that the standards in the ANSI/ASME N45.2 series have been withdrawn.?