United States Nuclear Regulatory Commission - Protecting People and the Environment

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

HPPOS-037 PDR-9111210173

Title: Farley 1 & 2 - 10 CFR Part 20 Exemption Request,

MSA GMR-I Canister (Part No. 466220) Radioiodine Protection

Factor

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

environments.

5. The service life of the MSA GMR-I Canisters were to

be calculated from the time of unsealing, including periods

of non-exposure.

6. The MSA GMR-I Canisters were to be used with a full

facepiece capable of providing protection factors greater

than 100.

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

nonradioactive compounds.

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staff and will remain in effect until rescinded by NRC

staff or superseded by regulation.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

Applicability: Reactors

Page Last Reviewed/Updated Thursday, March 29, 2012