ML20066H900
| ML20066H900 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 02/19/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20066H891 | List: |
| References | |
| NUDOCS 9102220173 | |
| Download: ML20066H900 (2) | |
Text
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jo UNITED STATES g
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NUCLEAR REGULATORY COMMISSION
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- j WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO CLASS C STORAGE ENVIRONMENT FOR SORBENT CANISTERS 6
JOSEPH M. FARLEY NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-348 AND 50-364 INTRODUCTION 4
By submittal dated February 19, 1990, as supplemented June 11 and December 5, 1990, Alabama Power Company (the licensee) requested an amendment to the exemption granted October 23, 1984, to alkw Mine Safety Appliances (MSA) GMR-1 canisters to be stored in a Class C s% rage environment versus a Class A
, storage environment as defined in ANSI N45.2.?. Additionally, in response to concerns identified by the Nuclear Regula'nry Commission (NRC) staff, the licensee has included in the amendment request a connitment to a revised
. respirator fit factor.for use of the MSA GMR-I canisters.
EVALUATION The licenee's submitL! povided a letter from the Mine Se.ety Appliances
~ Company (MSA) which cortaks a sunnary of test results which form the basis for HSA and the licensee's conclusion that Class C storage is acceptable.
The test sunnary discussed accelerated storage tests, Class B storage tests, and a moisture permeation study of the bottom seal.
The-accelerated storage tests consisted of 24 canisters after 4 months' storage being-exposed to a.10 ppm methyliodide concentration for 480 minutes, three canisters -after 6 months' storage being exposed to a 5 ppm methyliodide concentra-tion for 480 minutes, and one canister af ter l' year's storage being exposed to i
- an 8 ppm methyliodide concentration for 480 minutes.
In all cases, methyliodide penetration was below 0.5%.
In addition, the _three canisters tested after 6 months' storage had their testing continued to a 1% break-through of methyllodide.
The average time to a 1% breakthrough was 44 hours5.092593e-4 days <br />0.0122 hours <br />7.275132e-5 weeks <br />1.6742e-5 months <br />.
The Class B storage te ts consisted of sarples drawn at 3-and 4-year storage intervals. and -tested. Test penetrations were at or below initial inspectior.
results for the canister lot.
The moic ce permeation study on the canister bottom seal was conducted at 100*F.3d >0% relative humidity. MSA found the moisture incursion to be insignP
- v.t.
.The NRC staff has reviewed the information submitted by the licensee and concludes that Class C storage is acceptable.
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, Theiexemption' granted'on October 23; 1984,-included a limitation that the
, canisters be used with' a full facepiece capable of provi/.ing a protection:
factor greater.than-100. Protection factors are a measure of protectionifrom the work place atmosphere that can be. assumed when using a particular respirator.
Protection factors are established in Apptndix A to-10 CFR Part 20
' for various classes,of respirators.- Appendix A to 10 (FR'Part.20= specifies
- a, maximum protection factor of'50.for a full facepiece 1egative pressure respirator in which the MSA GMR-I' canisters are to be ured.. Therefore, i
Appendix A to 10.CFR Part 20 does not allow credit-for a protection factor of t100 for, a full: f acepiecef respirator as was specified in the original exemption.
In, response to ' discussions with the. NRC staff, the licensee resolved this issue by revising the amendment request to commit to use the MSA GMR-1 canisters-with:a full facepiece respirator capable of providirs a fit factor equal to or greater.than 500, ' A minimum fit factor of'500 is consistent with current good
-. industry practice and has been found acceptable in the past by the NRC staff..
Therefore, the revised fit factorz is; acceptable for the use-of the MSA GMR-1
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canisters at ' Joseph M..Farley Nuclear Plant, Units 1 and.2.
. Principa1' Contributor:
Stephen 4T. Hoffman
= Dated:
February 19, 1991-l 5
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