Pursuant to 10 CFR 50.46, "Acceptance Criteria for Emergency Core Cooling Systems for Light-

water Reactors, " GE Hitachi Nuclear Energy (GEH) is submitting this report to document any emergency core cooling system (ECCS) evaluation model changes or errors that affect the temperature calculation for the ESBWR Standard Plant Design. This is the first annual report for the ESBWR Standard Plant Design as submitted in letter number MFN 10-352 (Reference 1) dated December 2, 2010 and it documents that no changes have occurred. The information included in this letter is generic and is expected to apply to all COL applications referencing the ESBWR Design Certification Application. By copy of this letter, COL Applicants are hereby notified of any changes or errors in the ESBWR Standard Design PCT as required by 10 CFR 50.46(a)(3)(iii). Please contact me if you have any questions regarding this information, copying the prospective COL Applicants included on the cc: list of this letter. Sincerely