Attention.

With this letter, Mitsubishi Heavy Industries, Ltd. ("MHI1") transmits to the U.S. Nuclear Regulatory Commission ("NRC") a document entitled "Response to Request for Additional Information No. 211-1946, Revision 1." Enclosed are the responses to 3 RAIs contained within Reference 1. Of these RAIs in Reference 1, 4 will not be answered within this package. They are: RAI 3.7.1-3, which has a 60-day response time, as agreed to between the NRC and MHI, and will be issued at a later date by a separate transmittal. RAI 3.7.1-5, which has a 60-day response time, as agreed to between the NRC and MHI, and will be issued at a later date by a separate transmittal. RAI 3.7.1-6, which has a 60-day response time, as agreed to between the NRC and MHI, and will be issued at a later date by a separate transmittal. RAI 3.7.1-7, which has a 60-day response time, as agreed to between the NRC and MHI, and will be issued at a later date by a separate transmittal.