Mitsubishi Heavy Industries, Ltd.'s Application for Design Certification of

During the acceptance review of the combined license application for Comanche Peak 3 and 4 (Reference 1, "R-COLA"), which incorporates by reference the Mitsubishi Heavy Industries, Ltd. (MHI) design certification application for the US-APWR Standard Plant Design (Reference 2, "DCD"), the U.S. Nuclear Regulatory Commission ("NRC") Staff has raised questions about COL holder items in the R-COLA. In response, MHI has performed a comprehensive review of those COL information items in the DCD that are identified as COL holder items in the R-COLA, which is summarized in Enclosure 1. This review examined both the information required for the NRC's licensing review and whether the DCD already contained this information. The examination reached the following conclusions: 1. For some COL information items, the DCD should be supplemented to provide the additional information necessary for the NRC's licensing review. 2. For some COL information items, sufficient information for the NRC's licensing review is already provided in the DCD. 3. For other COL information items, the information specified by the COL item i