NRC 10 CFR 20 and DOE rules

Earlier lessons quoted pieces of 10 CFR Part 20 as they arose. This lesson puts the United States framework in order. The class's assignment is practical: Marcel gives them a short incident report from a contractor's radiography job at a pipe fabrication shop near Knoxville and asks them to find every regulatory obligation it triggered, who was responsible, and what the licensee had to report. To answer, they need to know who regulates what.

Who regulates

The Atomic Energy Act of 1954 gives the federal government authority over source, byproduct and special nuclear material. The Nuclear Regulatory Commission (NRC) licenses commercial nuclear power reactors, fuel facilities and many users of radioactive materials. Under section 274 of the Act, the NRC may hand its authority over materials licensees to states that sign agreements; Tennessee is one of these Agreement States, so a radiography company in Tennessee is licensed by the state under rules compatible with NRC's, while TVA's reactors remain NRC-licensed. The Department of Energy (DOE) regulates radiation protection at its own facilities, such as Oak Ridge National Laboratory near Knoxville, under 10 CFR Part 835. The Environmental Protection Agency (EPA) sets generally applicable environmental standards, and states regulate X-ray machines and naturally occurring radioactive material.

10 CFR Part 20, subpart by subpart

Two provisions deserve special mention. Planned special exposures, under 20.1206, allow an adult worker in an exceptional situation to receive a dose above the annual limit when alternatives that would avoid it are unavailable or impractical, with written authorization, advance briefing and limits: the dose from planned special exposures in a year may not exceed the annual limit, nor five times the annual limit over a lifetime. Overexposure reporting, under 20.2202, requires immediate notification of the NRC for a total effective dose equivalent of 0.25 Sv (25 rem) or more and notification within 24 hours for 0.05 Sv (5 rem) or more, with written reports under 20.2203.

DOE facilities: 10 CFR Part 835

At DOE sites, 10 CFR Part 835 sets an occupational limit of 50 mSv (5 rem) total effective dose per year, 150 mSv (15 rem) to the lens and 500 mSv (50 rem) to the skin, extremities and other organs, with a 1 mSv (100 mrem) limit for members of the public in controlled areas. It requires a documented radiation protection program approved by DOE, ALARA, and administrative control levels below the limits. DOE's radiological control standard recommends an administrative control level of 20 mSv (2 rem) per year for each worker, and many sites use lower values.

# Compliance check under 10 CFR Part 20 (doses in rem; 1 rem = 10 mSv).
history = {2022: 0.85, 2023: 1.20, 2024: 2.10, 2025: 0.90, 2026: 0.60}   # TEDE per year, rem
ANNUAL = 5.0                 # rem TEDE, 10 CFR 20.1201
ACL = 2.0                    # rem, illustrative administrative control level
for year, d in sorted(history.items()):
    flags = []
    if d > ANNUAL: flags.append('exceeds 20.1201 limit')
    if d > ACL: flags.append('above administrative control level: management review')
    print(f"{year}: {d:4.2f} rem ({10*d:5.1f} mSv)  {'; '.join(flags) or 'ok'}")

def report(tede_rem):
    if tede_rem >= 25: return 'immediate notification (20.2202(a))'
    if tede_rem >= 5: return 'notification within 24 hours (20.2202(b))'
    return 'no overexposure report; record dose and follow license event reporting'

for who, dose in (('radiographer', 0.60), ('assistant', 0.04)):
    print(f"{who:12s} {dose:4.2f} rem -> {report(dose)}")

2022: 0.85 rem (  8.5 mSv)  ok
2023: 1.20 rem ( 12.0 mSv)  ok
2024: 2.10 rem ( 21.0 mSv)  above administrative control level: management review
2025: 0.90 rem (  9.0 mSv)  ok
2026: 0.60 rem (  6.0 mSv)  ok
radiographer 0.60 rem -> no overexposure report; record dose and follow license event reporting
assistant    0.04 rem -> no overexposure report; record dose and follow license event reporting

Inspection and enforcement

The NRC inspects power reactors under the Reactor Oversight Process, in which occupational radiation safety and public radiation safety are two of the cornerstones, and materials licensees under inspection programs scaled to risk. Violations are categorized by severity, from minor issues to civil penalties, orders and license actions, and inspection reports are public. Workers have the right under Part 19 to request an inspection and to talk privately with inspectors, and are protected from discrimination for raising safety concerns.

Workers' rights under Part 19

10 CFR Part 19 gives workers specific rights. Licensees must post the NRC's notice to employees form, together with the regulations and license conditions or a statement of where they can be seen; instruct workers in radiation risks and protective measures; provide each monitored worker with an annual report of dose, and a report on request when the worker leaves; and allow workers to request an NRC inspection and to speak privately with inspectors. Section 211 of the Energy Reorganization Act protects workers who raise safety concerns from retaliation.

Posting, labeling and surveys in practice

Subpart J requires the radiation symbol, in magenta or black on yellow, with the wording appropriate to each area: caution, radiation area; caution or danger, high radiation area; grave danger, very high radiation area; caution, airborne radioactivity area; and caution or danger, radioactive materials. Containers of licensed material above set quantities must be labeled with the nuclides, activities and dates. Subpart F requires surveys that are reasonable to evaluate the magnitude and extent of radiation levels, concentrations and quantities of material, and calibration of the instruments used.

State programs and compatibility

Agreement States must keep programs adequate to protect public health and safety and compatible with the NRC's, and the NRC reviews each state's program periodically. States usually adopt NRC rules by reference or with small changes, so a radiographer working in several states meets almost identical requirements, but licensees must still follow the rules of the state where the work is done and obtain reciprocity before working in another state. States also regulate X-ray machines, accelerators not covered by the Atomic Energy Act and naturally occurring radioactive material, which the NRC does not.

Reading a license

A power reactor's operating license and technical specifications, together with its updated final safety analysis report and the radiation protection program description, define what the licensee has committed to. Many of the detailed commitments sit in plant procedures that implement Part 20 and the NRC's regulatory guides. An engineer joining a licensee should learn where each requirement comes from, because a procedure step that traces to a regulation cannot be changed in the same way as one that is only good practice.

Marcel's radiography case ends with one more lesson: the company had reported the equipment failure to the state promptly but had not reviewed the assistant's training records, which turned out to be out of date. The state treated the lapsed training as a separate violation. Knowing the license conditions matters as much as knowing the regulations.

Overlap between agencies in practice

Conventional workplace hazards at an NRC-licensed plant, such as falls, electrical safety and confined spaces, fall under OSHA, while radiation hazards from licensed material fall under the NRC; a memorandum of understanding between the two agencies sets out the division. At DOE sites, worker safety and health more broadly are covered by 10 CFR Part 851 alongside Part 835. A confined space entry into a contaminated tank must therefore satisfy OSHA's confined space standard and the radiation protection program at the same time, and plant procedures combine the two so that workers follow one set of instructions.

Radiation protection professionals in the United States often hold certification from the American Board of Health Physics or, for technicians, the National Registry of Radiation Protection Technologists, which employers and regulators recognize as evidence of competence.