UFSAR Licensing and Regulatory Compliance professionals need to have a thorough understanding of what information comprises the design bases and licensing basis for their plants. They also must understand the relationship of a plant’s design bases to the information that constitutes its current licensing basis. Current licensing basis is defined in 10 CFR 54 for license renewal.
Defining the pieces
The design bases are defined in 10 CFR 50.2. Supporting design information underlies
the 10 CFR 50.2 design bases, including other design inputs (e.g., formal calculations),
design analyses, and design output documents.
Together, all the 10 CFR 50.2 design bases and the supporting design information
comprise the comprehensive set of design information developed for a nuclear power
plant. They may be contained in the Updated Final Safety Analysis Report (UFSAR) or
in other documents either docketed with NRC or retained by the licensee.
The design bases, supporting design information, and the UFSAR are contained within
the licensing basis.
The UFSAR specifically
The UFSAR is a licensing basis document that must be maintained throughout the life
of the nuclear power plant and updated accurately at intervals.
Depending on a plant’s outage schedule, revisions are filed annually or within six
months after each refueling outage provided the interval between updates does not
exceed 24 months. Multi-unit plants typically receive an exemption to update their
combined FSAR based on one unit’s outage dates, or 24-months.
Throughout the cycle, operations, licensing, and compliance staff evaluate regulatory requirements and plant changes, and they make changes to the FSAR as needed. At the end of the cycle, a new revision is submitted to the Nuclear Regulatory Commission. A new cycle starts, and additional changes are made to the FSAR as required.