Performing this procedure from this practice should result in a properly adjusted walk-through metal detector operating at or near the optimum sensitivity setting for the environment in which it is installed.

This practice determines the lowest sensitivity setting required to detect a specified test object and establishes a sensitivity setting suitable for most operational needs.

This practice may be used to establish an initial sensitivity setting for follow-on procedures that determine credible values for probability of detection and confidence level, as required by regulatory authorities.

1.1 This practice covers a procedure for adjusting the operational sensitivity of in-plant walk-through metal detectors. Performance of this procedure should result with in-plant walk-through metal detectors being adjusted to an initial operational sensitivity setting suitable for performance testing.

1.2 This practice does not set test object specifications or specify specific test objects. These should be specified by the regulatory authority.

1.3 This practice uses information developed by Practice C1270, or an equivalent procedure, which identifies the critical test object (from a specified set of test objects), its critical orientation, and the critical test path through the detection zone. In the case of Practice C1270, the information is found on the detection sensitivity map(s) for each in-plant walk-through metal detector.

1.4 This practice is one of several developed to assist operators of nuclear facilities with meeting the metal detection performance requirements of the regulatory authorities (see Appendix).

1.5 This standard practice is neither intended to set performance levels nor limit or constrain technologies.

1.6 This practice does not address safety or operational issues associated with the use of walk-through metal detectors.

1.7 The values stated in SI units are to be regarded as standards. The values given in parentheses are for information only.