U.S. Nuclear Regulatory Commission
Farley 1 & 2 - 10 CFR Part 20 Exemption Request, MSA GMR-I Canister (Part N o. 466220) Radioiodine Protection Factor
Title: Farley 1 & 2 - 10 CFR Part 20 Exemption Request,
MSA GMR-I Canister (Part No. 466220) Radioiodine Protection
See the memorandum from D. R. Muller to G. C. Lainas dated
June 28, 1984. It recommended an exemption to allow
licensees to use MSA GMR-I canisters for protection against
iodine gases and vapors with certain restrictions. This
action set a precedent. The health physics position was
written in the context of 10 CFR 20.103, but it also
applies to "new" 10 CFR 20.1703.
The Radiological Assessment Branch (RAB) reviewed a
licensee's application for an exemption to 10 CFR Part 20,
Appendix A, Footnote d.2 (c) to allow the use of MSA GMR-I
Canisters. Although the action established a precedent,
the RAB recommended, in accordance with the provisions of
10 CFR 20.103 (e) [or 10 CFR 20.1703 (a) (2)], that the
exemption be approved with restrictions.
The restrictions were enumerated by the NRC staff in their
Safety Evaluation Report and are summarized as follows:
1. A protection factor of 50 for radioiodine gases and
vapors was to be used.
2. The MSA GMR-I Canisters were to be discarded after
a maximum of 8 hours continuous use time.
3. The MSA GMR-I Canisters were not to be used in the
presence of organic solvent vapors.
4. The MSA GMR-I Canisters were to be stored in
sealed, humidity barrier packaging in cool, dry
5. The service life of the MSA GMR-I Canisters were to
be calculated from the time of unsealing, including periods
6. The MSA GMR-I Canisters were to be used with a full
facepiece capable of providing protection factors greater
7. The MSA GMR-I Canisters were not to be used in
total challenge concentrations of organic iodines and other
halogenated compounds greater than 1 ppm, including
8. The MSA GMR-I Canisters were not to be used in
environments with temperatures greater than 110F.
The above exemptions are subject to amendment by the NRC
staff and will remain in effect until rescinded by NRC
staff or superseded by regulation.
Regulatory references: 10 CFR 20.103, 10 CFR 20.1703,
NUREG / CR-3403
Subject Code: 8.4, 8.10