ML24124A174
| ML24124A174 | |
| Person / Time | |
|---|---|
| Issue date: | 05/13/2024 |
| From: | David Petti Advisory Committee on Reactor Safeguards |
| To: | Walter Kirchner Advisory Committee on Reactor Safeguards |
| References | |
| Download: ML24124A174 (1) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS WASHINGTON, DC 20555 - 0001
MEMORANDUM TO: Walter Kirchner, Lead NuScale Subcommittee Advisory Committee on Reactor Safeguards
FROM: David Petti, Member Advisory Committee on Reactor Safeguards
SUBJECT:
INPUT FOR ACRS REVIEW OF THE NUSCALE STANDARD DESIGN APPROVAL (SDA) APPLICATION - SAFETY EVALUATION REPORT FOR CHAPTER 11, RADIOACTIVE WASTE MANAGEMENT
In response to the Subcommittees request, I have reviewed the NRC staffs safety evaluation report (SER) provided to support ACRS review of the SDA application, and the associated section of the applicants submittal for Chapter 11, Radioactive Waste Management. The following is my recommended course of action concerning further review of this chapter and the staffs associated safety evaluation.
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Background===
The NuScale US460 standard design uses a shared system for managing radioactive waste from the six modules. The NuScale radioactive waste management systems include the liquid radioactive waste system, gaseous radioactive waste system, solid radioactive waste system, and process and effluent radiation monitoring instrumentation and sampling system. These systems are designed for normal operations, including refueling outages, routine maintenance, and anticipated operational occurrences.
The source term for the system is calculated as one module at the design basis failed fuel fraction and five modules running at a realistic failed fuel fraction. The design basis has 10 times the fuel failure fraction of a realistic failed fuel fraction. Some secondary coolant becomes activated by primary to secondary leakage. The source term also includes tritium and Ar-41, radionuclides that tend to dominate chronic releases. NuScale uses the same methodology as used in the certified design and SDA application, but the numerical values have changed because of changes in power level of the modules, the number of modules, the fuel cycle length and burnup.
The staffs review of these systems found that the designs meet all regulatory requirements including those related to Three Mile Island post-accident monitoring from Title 10 of the Code of Federal Regulations (10 CFR) Section 50.34(f) that raised concerns in our review of the certified design. Source term calculations for these systems were performed by the staff to confirm the applicants results. A number of site-specific combined license items were identified for these systems.
W. Kirchner
SER Summary
The SER documents the staffs evaluation of the applicants design for compliance with applicable regulations and standards, including 10 CFR Part 52, Subpart E, Standard Design Approvals. The NRC staff evaluated the descriptions and discussions of NuScales proposed radioactive waste management system. T he NRC staff found that the descriptions and discussions of NuScales radioactive waste management system are sufficient and meet the applicable regulatory requirements and guidance, and acceptance criteria, for the issuance of a standard design approval.
Concerns
I did not identify any specific deficiencies or concerns in my review. The application was well documented, and the staffs evaluation thorough.
Recommendation
As lead reviewer for NuScale SDA application, Chapter 11, I recommend no further review at this time.
References
- 1. U. S. Nuclear Regulatory Commission, Safety Evaluation of NuScale SDAA Chapter 11, Radioactive Waste Management,February 24, 2024 (ML24016A033).
- 2. NuScale Power, LLC, Standard Design Approval Application, Part 2, Chapter 11, Radioactive Waste Management, Revision 1, October 31, 2023 (ML23304A358).
W. Kirchner - 3 -
SUBJECT:
INPUT FOR ACRS REVIEW OF THE NUSCALE STANDARD DESIGN APPROVAL (SDA) APPLICATION - SAFETY EVALUATION REPORT FOR CHAPTER 11, RADIOACTIVE WASTE MANAGEMENT
Package Accession No: ML24124A166 Accession No: ML24124A174 Publicly Available (Y/N): Y Sensitive (Y/N): N If Sensitive, which category?
Viewing Rights: NRC Users or ACRS only or See restricted distribution OFFICE ACRS SUNSI Review ACRS ACRS NAME MSnodderly MSnodderly LBurkhart DPetti DATE 5/06/24 5/06/24 5/06/24 5/07/24 OFFICIAL RECORD COPY