SCE Announces That Nuclear Regulatory Commission Finds Flaws in Mitsubishi Heavy Industries' Design That Led to Failed Steam Generators at San Onofre

The Nuclear Regulatory Commission (NRC) has confirmed to Southern California Edison (SCE) that the NRC has identified flaws in how Mitsubishi Heavy Industries (MHI) used its computer codes to design the failed steam generators at the San Onofre Nuclear Generating Station (SONGS). The NRC further informed Southern California Edison that it is issuing a “Notice of Non-Conformance” against MHI for its flawed computer modeling in the failed design. The NRC is also citing SCE for failing to ensure that MHI's modeling and analysis were adequate. In particular, the NRC reports indicate that MHI's use of its computer codes in the design of the steam generators inaccurately predicted thermal hydraulic conditions in the steam generators, leading to tube See full press release