Energia i regulacje · 5.08.2009

Industry Codes and Standards; Amended Requirements

The NRC is proposing to amend its regulation governing vessel head inspection requirements. This amendment would revise the upper range of the percentage of axial flaws permitted in a specimen set used in the qualification of nondestructive examination systems (procedures, personnel and equipment), for the performance of inservice inspection (ISI) of pressurized water reactor (PWR) upper reactor vessel head penetrations. This amendment is being proposed as a result of the withdrawal of a stakeholder's recommendation necessitated by a typographical error in the original recommendation with respect to the maximum percentage of flaws that should be oriented axially.