Document: NRC Regulatory Guide
Document ID: dff52070-b179-4367-bf66-5d1107c54315
Document Type: regulatory_guide
Title: Design, Inspection, and Testing Criteria for Air Filtration and Adsorption Units of Normal Atmosphere Cleanup Systems in Light-Water-Cooled Nuclear Power Plants + HISTORY – HISTORY 06/2012 – DG-1280 , Proposed Revision 3 10/2000 – DG-1103 , Proposed Revision 2 (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1127/ML11273A057.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.140
CFR Part: 
CFR Title: 

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guide if (1) testing in accordance with Table 1 of this guide results in a representative sample failing an acceptance criterion or (2) no representative sample is available for testing. e. For power cycle waste offgas systems relying on activated carbon delay tanks or beds, the above laboratory testing criteria for activated carbon are deemed applicable, but should be evaluated and applied taking into consideration the system’s specific design features. DG-1280, Page 11 Table 1. Inservice Adsorber Laboratory Tests for Activated Carbon Activated Carbon Total Bed Depth Maximum Assigned Activated Carbon Decontamination Efficiencies Methyl Iodide Penetration Acceptance Criterion for Representative Sample 2 inches Elemental iodine Organic iodide 95% 95% Penetration #5% when tested in accordance with ASTM D3803-1991 (Ref. 12) 4 inches or greater (in-series beds are treated as a single bed of aggregate depth) Elemental iodine Organic iodide 99% 99% Penetration #1% when tested in accordance with ASTM D3803-1991 (Ref. 12) Activated carbon in delay tanks or beds Elemental iodine Organic iodide 99% 99% Penetration #1% when tested in accordance with ASTM D3803-1991 (Ref. 12) Table 1 Notes: (1) See Appendix I to ASME N509-2002 for the definition of a representative sample. (2) Credited decontamination efficiencies (a portion of which includes bypass leakage) are based on a 0.25-second residence time per 5.1 centimeter (2-inch bed depth). (3) The activated carbon, when new, should meet the specifications of Regulatory Position 4.i of this guide. Table 1 provides acceptable decontamination efficiencies and methyl iodide test penetrations of used activated carbon samples for laboratory testing. Testing should be performed at the frequencies specified in Regulatory Position 7.c of this guide. Testing should be performed in accordance with American Society for Testing and Materials (ASTM) D3803-1991 (Reaffirmed 2009), “Standard Test Methods for Nuclear-Grade Activated Carbon”