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Risk Assessment
Risk Assessment and Federal Guidance Programs:  

COMPLY

Risk Assessment

A computerized screening tool for evaluating radiation exposure from atmospheric releases of radionuclides. May be used for demonstrating compliance with some EPA and Nuclear Regulatory Commission regulations.

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Background

In 1985, EPA asked the National Council on Radiation Protection and Measurements (NCRP) to develop simple screening methods for assessing compliance with the Clean Air Act by users of small quantities of radionuclides. NCRP published these procedures in 1986 and 1989 in Commentary No. 3 (NCRP89). EPA's COMPLY model was developed based on the procedures in Commentary No. 3.

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Regulatory Context

The COMPLY computer software may be used to demonstrate compliance with the National Emission Standards for Hazardous Air Pollutants (NESHAPS) in 40 CFR 61, Subpart I and H.

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Application Niche

COMPLY calculates the effective dose equivalent (ede) from radionuclides released from stacks and vents. Atmospheric concentrations are estimated using a Gaussian plume model and equations that account for building wake effects.

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Strengths and Limitations

The COMPLY computer software includes four levels of complexity. A user can demonstrate compliance at any level. Level 1 requests the least amount of information, however "worst case" assumptions are used in the dose estimate. Level 4 requests the most information and uses site specific data instead of assuming the worst.

The values estimated by this screening model are strictly for comparison with environmental standards and are not intended to represent actual doses to real people.

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Hardware Requirements

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References

NCRP89, Screening Techniques for Determining Compliance with Environmental Standards, NCRP Commentary No. 3, National Council on Radiation Protection and Measurements, Revision of January 1989 with Addendum of October 1989.

COMPLY is also referenced in the Nuclear Regulatory Commission Regulatory Guide 4.20 Constraint on Releases of Airborne Radioactive Materials to The Environment For Licensees Other Than Power Reactors (Draft issued as DG-8016).

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