Summary of Proposed Reliability Standard NUC-001-3 Reliability Standards Authority: NERC Standard: NUC-001-3 – Nuclear Plant Interface Coordination Purpose: This standard requires coordination between Nuclear Plant Generator Operators and Transmission Entities for the purpose of ensuring safe operation and shutdown of nuclear power plants. Change Type: Revised based on the recommendations arising from NERC’s obligatory periodic review of reliability standards. Applicable Functional Entities: All Transmission Entities Non-Ansi Standard: No Ballot Results: Quorum 88.63%, Approval 97.23% Technical Impact in Ontario: None. Costs of Implementation: None. Ontario Participant Support: Ontario voted for the standard. Reliability Standard Milestone Date August 14, 2014 September 15, 2014 September 25, 2014 January 13, 2015 TBD TBD TBD Action Adopted by NERC Board of Trustees NERC Petition for Regulatory Approval IESO Posting Date End of OEB Review Period FERC Order Issued US Mandatory Enforcement Date Ontario Enforcement Date (Milestones in Reliability Standard Development and Lifecycle) Summary: NERC filed for regulatory approval Reliability Standard NUC-001-3 to replace the currently effective NUC-001-2.1 reliability standard. The proposed standard requires a nuclear plant generator operator to coordinate operations and planning with transmission entities providing services relating to nuclear plant operating and off-site power delivery requirements. The NERC Reliability Standard Brief Page 1 of 2 nuclear plant generator operators and transmission entities must execute and implement interface agreements setting forth expectations and procedures for coordinating operations to meet the nuclear plant licensing requirements and system operating limits affecting nuclear plant operations. The proposed reliability standard carries forward the obligations from the currently effective standard, but contains several improvements, many of which are intended to provide clarity by improving the structure and language over the currently effective version. The most substantial revision clarifies that all agreements are not required to address each of the elements identified in Requirement R9, but that the agreements taken as a whole must address all elements. There are no technical and no financial impacts anticipated with the proposed standard. Other Salient Information: The IESO is not aware of any other significant factors. NERC Reliability Standard Brief Page 2 of 2