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Executive Summary

Power uprates are a regulated process for increasing a nuclear power plant's licensed thermal power output. The Nuclear Regulatory Commission (NRC) categorizes power uprates into three types based on the magnitude of increase and implementation approach. This document provides comprehensive guidance on power uprate types, successful implementation examples, and a roadmap for initiating the application process. Recent legislative changes, including the Inflation Reduction Act of 2022 and the 2024 ADVANCE Act, have renewed industry interest in power uprates, with over 50% of nuclear plant licensees expressing interest in pursuing these modifications. [1] [2]

Technical Analysis

Types of Power Uprates

The NRC recognizes three distinct categories of power uprates, each with different characteristics, implementation requirements, and review timelines:

1. Measurement Uncertainty Recapture (MUR) Power Uprates:
2. • Involve power increases of less than 2%
   • Achieved by implementing enhanced techniques for calculating reactor power
   • Utilize state-of-the-art devices to more precisely measure feedwater flow
   • Reduce uncertainty margins in power level calculations
   • Typically have the shortest review timeline (approximately 9 months) [3] [1] [4] [5] [6]
2. Stretch Power Uprates (SPU):
3. • Typically involve power increases of up to 7%
   • Generally remain within the original design capacity of the plant
   • Usually require changes to instrumentation setpoints
   • Do not generally involve major plant modifications
   • Moderate review timeline (approximately 12 months) [3] [1] [4] [5] [6]
3. Extended Power Uprates (EPU):
4. • Greater than stretch power uprates, with increases as high as 20%
   • Require significant modifications to major balance-of-plant equipment
   • Examples of modifications include high-pressure turbines, condensate pumps and motors, main generators, and/or transformers
   • Most complex review process (approximately 18 months)
   • Require more extensive safety analyses and plant modifications [3] [1] [4] [7] [5] [6]

Successful Implementation Examples

Several nuclear plants have successfully implemented power uprates, providing valuable precedents and lessons learned:

1. Turkey Point Nuclear Plant, Units 3 and 4:
2. • Successfully implemented an Extended Power Uprate
   • Utilized a carefully planned power ascension test program
   • Leveraged industry operating experience in power uprate implementation
   • Implemented digital controls improvements to enhance system reliability
   • Demonstrated that plant modifications mitigated transients effectively [8] [9] [10]
2. Beaver Valley Units 1 and 2:
3. • Three-loop Westinghouse plants that uprated from 2689 MWt to 2900 MWt (~7.9% increase)
   • Conducted power ascension testing in a controlled manner in two stages
   • Used pre-EPU power level data as a "baseline" to predict operating values at EPU
   • Demonstrated that plant response remained within pre-established acceptance criteria
   • Provided a strong indicator of expected results for similar plant designs [8] [10]
3. Dresden Unit 3:
4. • Experienced several turbine trips and a generator load rejection from high uprated power conditions
   • Plant response was as expected with no new plant behaviors observed (except for FWLCS tuning)
   • Demonstrated that analytical models used for transient analyses accurately model plant behavior at EPU conditions
   • Provided valuable operational experience data for similar BWR designs [11]
4. R.E. Ginna Nuclear Power Plant:
5. • Successfully uprated to a core thermal power level of 2644 MWt
   • Has operated successfully at the new power level since NRC approval in July 2006
   • Represents a successful example of a Westinghouse two-loop design uprate [8]

Regulatory Considerations

Application Process Framework

The power uprate application process follows a structured regulatory pathway:

1. Legal Basis:
2. • Power uprates require NRC permission to amend the operating license
   • The process is governed by 10 CFR 50.90 through 10 CFR 50.92, "Issuance of Amendment"
   • Applications must follow the form prescribed for original applications
   • The NRC performs and documents a safety evaluation before authorizing the change [12] [13]
2. Key Guidance Documents:
3. • For Extended Power Uprates: Review Standard (RS)-001, "Review Standard for Extended Power Uprates" (ML033640024)
   • For Measurement Uncertainty Recapture: RIS 2002-03, "Guidance on the Content of Measurement Uncertainty Recapture Power Uprate Applications"
   • For All Power Uprates: NRR Office Instruction LIC-112, "Power Uprate Process" (ML19254A627)
   • For Review Process: NUREG-0800, Standard Review Plan, where appropriate [2] [12] [14] [15]
3. Review Process:
4. • After submission, the NRC issues a Federal Register notice alerting the public
   • The public has 30 days to comment and 60 days to request a hearing
   • NRC staff reviews data and accident analyses to confirm safe operation at higher power
   • The NRC issues another Federal Register notice if the amendment is approved
   • Following approval, the NRC performs inspections of the power uprate implementation using Inspection Procedure 71004 [16] [12] [17]
4. Review Timeline Targets:
5. • MUR power uprates: 9 months from application acceptance
   • Stretch power uprates: 12 months from application acceptance
   • Extended power uprates: 18 months from application acceptance
   • The application acceptance process ensures quality is sufficient for regulatory review [16] [6]

Recent Regulatory Developments

The regulatory landscape for power uprates has evolved with recent legislative changes:

1. Inflation Reduction Act (2022):
2. • Includes production tax credits and investment tax credits for nuclear utilities
   • Credits can offset costs related to power uprates
   • Has led to increased industry interest in power uprates
   • Over 50% of nuclear plant licensees expressed interest in pursuing power uprates after passage [1] [2]
2. ADVANCE Act (2024):
3. • Prompted NRC to identify opportunities to improve and optimize reviews
   • Goal of reaching original timeline targets for different types of power uprates
   • NRC is updating guidance in Office Instruction LIC-112 and other documents
   • NRC is engaging with stakeholders through public meetings to obtain feedback [18] [19] [2]

Uncertainties and Limitations

While power uprates offer significant benefits, several challenges and considerations should be acknowledged:

1. Technical Challenges:
2. • Steam dryer cracking and flow-induced vibration damage have occurred at some uprated plants
   • Equipment environmental qualification may need reassessment for higher power conditions
   • Increased pipe stresses due to higher operating temperatures, pressures, and flow rates
   • Potential impacts on safety margins must be carefully evaluated [19] [20] [21]
2. Operational Considerations:
3. • Transient response characteristics may change at uprated power levels
   • Control system tuning and setpoint adjustments may be necessary
   • Operator training requirements for modified systems and procedures
   • Post-modification testing is essential to verify system performance [11] [9]
3. Emerging Trends:
4. • Bundling power uprates with other licensing actions (e.g., fuel transitions, MELLLA+)
   • Addressing challenges with environmental qualifications for higher burnup/increased enrichment
   • Potential use of license conditions to address implementation challenges
   • Integration with accident tolerant fuel and other emerging technologies [22] [23] [19]

Recommendations and Next Steps

To initiate a successful power uprate application, consider the following structured approach:

1. Initial Assessment and Planning:
2. • Determine which type of power uprate is most appropriate for your facility
   • Conduct a feasibility study to identify necessary modifications and potential challenges
   • Review applicable NRC guidance documents for your specific uprate type
   • Develop a detailed project plan and timeline [2] [12] [14]
2. Pre-Application Engagement:
3. • Schedule pre-application meetings with the NRC to discuss plans
   • Review successful power uprate applications from similar plants
   • Identify potential issues early and develop mitigation strategies
   • Consider bundling with other planned licensing actions if appropriate [22] [23] [19]
3. Application Development:
4. • Provide comprehensive description of proposed changes
   • Include detailed safety analyses demonstrating continued safe operation
   • Address all technical areas outlined in applicable guidance documents
   • For MUR uprates, follow RIS 2002-03 guidance on content
   • For EPUs, follow RS-001 review standard [16] [12] [14]
4. Implementation Planning:
5. • Develop a detailed power ascension test program with hold points
   • Plan necessary plant modifications and their implementation sequence
   • Prepare operator training on new procedures and system changes
   • Establish a monitoring program to track plant performance
   • Prepare for NRC inspections using Inspection Procedure 71004 [17] [8] [9]
5. Stakeholder Communication:
6. • Develop a communication plan for internal and external stakeholders
   • Prepare for potential public hearings and information requests
   • Document pre-application discussions in public meeting summaries
   • Consider whether application information can be made publicly available [24] [25]

By following this structured approach and leveraging industry experience, you can develop a successful power uprate application that meets regulatory requirements while maximizing the benefits to your facility. The current regulatory environment, with recent legislative support and NRC process improvements, presents a favorable opportunity for pursuing power uprates. [2] [6]

References

• [1,2,19] Office of Nuclear Reactor Regulation Preliminary Recommendations on Improving the Power Uprate Application and Review Process: ML24239A394
• [3,6,12,13,16] NUREG-1650, Rev. 5, "The United States of America Sixth National Report for the Convention on Nuclear Safety.": https://www.nrc.gov/docs/ML1330/ML13303B021.pdf
• [4] NUREG-1650 Rev. No. 2, "The United States of America Fourth National Report for the Convention on Nuclear Safety.": ML072890282
• [5] SECY-03-0190 - Status Report on Power Uprates.: ML032660398
• [7,14] 2006/08/31-NUREG-0800, Section 14.2.1, "Generic Guidelines for Extended Power Uprate Testing Programs," of the Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants, LWR Edition.: ML062210398
• [8] Turkey Point Nuclear Plant, Units 3 and 4 - Cover Letter and Amendments- Issuance of Amendments Regarding Extended Power Uprate.: ML11293A365
• [9,10] Turkey Point, Units 3 and 4 - Response to NRC Request for Additional Information Regarding Extended Power Uprate License Amendment Request No. 205 and Quality and Vendor Issues.: ML11119A134
• [11] 2005/02/24-Vermont Yankee - Technical Specification Proposed Change No. 263 - Supplement No. 23 Extended Power Uprate - Response to Request for Additional Information.: ML050610252
• [15] NUREG-0800 Sec 14.2.1 Draft Rev 0 "Standard Review Plan: Generic Guidelines for Extended Power Uprate Testing Programs.": ML030080406
• [17] IP 71004, Power Uprate: ML15121A676
• [18] NRC Power Uprate Review Preparation June 26, 2024 Public Meeting Slides: ML24178A037
• [20] NUREG-1650 Rev 1, The United States of America Third National Report for the Convention on Nuclear Safety.: ML042680236
• [21] "Extended Power Uprate Safety Analysis Rept for EI Hatch Plant,Units 1 & 2.": ML20216B271
• [22] Summary of September 5, 2024, Public Meeting with Nuclear Energy Institute to Discuss Potential Improvements in Nuclear Regulatory Commission Staff Guidance for Power Uprate Reviews (EPID L-2024-PPM-0004): ML24281A081
• [23] Summary of November 14, 2024, Public Meeting with Nuclear Energy Institute to Discuss Potential Enhancements for Power Uprate Applications and Reviews (EPID L-2023-PPM-0004): https://www.nrc.gov/docs/ML2500/ML25003A199.pdf
• [24] LIC-112, Revision 2, "Power Uprate Process": ML19254A627
• [25] Regulatory Issue Summary 2025-02 Planned Power Uprate-Related Licensing Submittals for All Power Reactor Licensees: https://www.nrc.gov/docs/ML2500/ML25007A001.pdf