Brief:
The U.S. Nuclear Regulatory Commission is set to unveil a proposed rule on October 31, introducing a novel risk-informed, technology-inclusive, performance-based licensing pathway specifically tailored for advanced nuclear reactors, as noted in a pre-publication notice for the upcoming Federal Register.
This new pathway, identified as 10 CFR Part 53, modifies the existing regulatory landscape by discarding a second proposed framework and eliminating the quantitative health objectives (QHOs) previously associated with nuclear plant risk assessments, according to the NRC’s disclosures.
- This transformation under Part 53 is projected to yield substantial financial savings—between $53.6 million and $68.2 million for each license applicant—when compared to the traditional Part 50 and Part 52 paths, while simultaneously enhancing stability, clarity, and flexibility within the regulatory framework, based on a draft analysis conducted by the NRC.
Insight:
“A successful implementation of Part 53 is anticipated to revolutionize the efficiency of licensing and oversight for advanced reactors, paving the way for a robust deployment of nuclear energy essential to achieving the nation’s climate, energy, economic, and national security objectives,” remarked Marc Nichol, the Nuclear Energy Institute’s Director of New Nuclear, in an email exchange.
The Nuclear Energy Innovation and Modernization Act, which earned sweeping bipartisan support from Congress and was enacted in January 2019, obliges the NRC to finalize the Part 53 rulemaking by the end of 2027. Despite encountering about a year of setbacks earlier in the process, Patrick White, Research Director at the Nuclear Innovation Alliance, expressed confidence that the agency could meet this timeline comfortably.
Earlier this year, in March, NRC commissioners instructed agency staff to overhaul a prior iteration of the Part 53 rule. Over the ensuing six months, NRC personnel have worked diligently to fulfill 15 specific directives laid out in the March 4 memorandum.
Noteworthy revisions in the proposed rule include the eradication of the redundant second regulatory framework—dubbed Framework B—and the removal of quantitative health objectives that previously guided assessments of potential human health risks associated with nuclear facilities.
The initial existence of Framework B raised alarms due to its overlap with existing rules, creating confusion and complexity, as noted by White. While Framework A represented a risk-informed methodology crafted during a comprehensive licensing modernization drive, Framework B merely mirrored conventional licensing practices, albeit with an intent to remain technology-neutral.
According to the IRS memo from March 4, staff were granted a year to explore three avenues for reconceptualizing the now-abandoned Framework B: integrating its principles into existing Parts 50 and 52, using it as an independent segment of 10 CFR, or “constructing a less prescriptive regulation that would offer guidance similar to Framework B.”
Industry insiders viewed the original QHO stipulations as a limitation on the flexibility of licensing applicants’ safety assessments. “Although this metric provides a pathway to demonstrate safety, it isn’t the sole method available,” White explained. He continued, “Designing a power plant that ensures safety is entirely feasible without adhering strictly to these design stipulations.”
Rather than mandating that all applicants adhere to QHO requirements, the redefined Part 53 aims to instruct license seekers to “develop a comprehensive plant risk metric (or set of metrics) and outline the pertinent methodology employed to validate that their design aligns with these metrics,” according to the staff memo.
While these proposed metrics and methodologies alone may not suffice to prove adequate safety, additional health and safety standards will remain applicable. The modification abolishing QHO requirements aims to “forge a more adaptable regulatory environment, allowing applicants to demonstrate compliance with comprehensive safety evaluations without being bound to a specific set of protocols,” White elaborated.
This strategic pivot embodies the overarching aim of Part 53: to establish a regulation adaptable to any technology, facilitating effective governance over the new generation of reactors.
However, with a protracted rulemaking process still on the horizon, proactive advanced reactor developers are currently navigating existing licensing channels for their inaugural projects. For instance, Oklo is opting for a "custom combined licensing process," while TerraPower is seeking separate construction and operational licenses through the traditional Part 50 route.
The evolution of Part 53 will be a gradual process, mirroring the histories of Parts 50 and 52, with its long-term viability hinging on its practical effectiveness compared to these established frameworks, White noted.
“No regulation is expected to be flawless upon its initial publication… but if clear benefits are absent, many applicants may prefer to continue utilizing Parts 50 or 52,” he candidly stated.
The issuance of the Part 53 proposed rule will initiate a public consultation period lasting a minimum of 60 days, potentially extending into the next year at the NRC’s discretion, White indicated. Following this, NRC staff will assess the feedback received and work towards a definitive rule.