The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

Reactor Pressure Boundary Integrity Issues for Pressurized Water Reactors

Several instances of primary water stress corrosion cracking (PWSCC) of nickel based alloys have been reported in the reactor pressure boundaries of pressurized water reactors (PWRs). The NRC is investigating the effect of PWSCC on the structural integrity of reactor pressure boundaries at all U.S. PWRs. NRC regulatory actions for Reactor Pressure Vessel (RPV) Upper Head, RPV Bottom Head, the Pressurizer, Reactor Coolant Systems Welds, and Overview are provided in the links below:

Graphic of Reactor Pressure Boundary IntegrityPressurizer Issues RPV Upper Head Issues RPV Bottom Head Issues Reactor Coolant System Weld Issues Overview of Reactor Pressure Boundary Integrity Issues

Related Information

(To top of page)

Page Last Reviewed/Updated Wednesday, March 11, 2020