Document: NRC Regulatory Guide
Document ID: 5ec01b96-5209-446f-95b3-7342d73ba086
Document Type: regulatory_guide
Title: Design, Inspection, and Testing Criteria for Air Filtration and Adsorption Units of Post-Accident Engineered-Safety-Feature Atmosphere Cleanup Systems in Light-Water-Cooled Nuclear Power Plants + HISTORY - HISTORY 12/2011 – DG-1274 , Proposed Revision 4 10/2000 – DG-1102 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1124/ML11244A045.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.52
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CFR Title: 

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results in a representative sample that fails to pass the applicable test in Table 2 of this guide or (2) no representative sample is available for testing. 10 For the definition of “representative sample” and a description of sampling methods, see Appendix I to ASME N509-2002 (Ref. 11). DG-1274, Page 17 Table 1. Instrumentation, Readout, Recording, and Alarm Provisions for ESF Atmosphere Cleanup Systems Sensing location Local readout/alarm Continuously manned control panel (main control room or auxiliary control panel if manning is a technical specification requirement) Unit inlet or outlet Flow rate (indication) Flow rate (recorded indication, high alarm and low alarm signals) Demister Pressure drop (indication) (optional high alarm signal) Electric heater Status indication Space between heater and prefilter Temperature (indication, high alarm, and low alarm signals) Temperature (indication, high alarm, low alarm, trip alarm signals) Prefilter Pressure drop (indication, high alarm signal) First HEPA (pre-HEPA) Pressure drop (indication, high alarm signal) Pressure drop (recorded indication) Space between adsorber and second HEPA (post-HEPA) Temperature (two-stage high alarm signal) Temperature (indication, two-stage high alarm signal) Second HEPA (post-HEPA) Pressure drop (indication, high alarm signal) Fan (Optional hand switch and status indication) Hand switch, status indication Valve/damper operator (Optional status indication) Status indication Deluge valves Hand switch, status indication Hand switch, status indication System inlet to outlet Summation of pressure drop across total system, high alarm signal DG-1274, Page 18 Table 2. Laboratory Tests for Activated Carbon Activated Carbona Total Bed Depthb Maximum Assigned Credit for Activated Carbon Decontamination Efficiencies Methyl Iodide Penetration Acceptance Criterion for Representative Sample 2 inches Elemental iodine 95% Penetration ≤2.5% when tested in accordance with ASTM D-3803-1991 (R2009)