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
CFR Part: 
CFR Title: 

Content:
(Ref. 28) Ductwork should be designed, constructed, and tested in accordance with Section SA of ASME AG-1-2009 with addenda. o. If used as postfilters, medium-efficiency filters of Minimum Efficiency Reporting Value (MERV) 15 or higher should be used. Postfilters should be designed and constructed in accordance with Section FB of ASME AG-1-2009 with addenda. 5. Maintainability Criteria Provisions for maintaining ESF atmosphere cleanup systems should be incorporated into the system design in accordance with Section HA of ASME AG-1-2009 with addenda (Ref. 13), as supplemented by the following: a. The accessibility of components for maintenance should be considered in the design of ESF atmosphere cleanup systems in accordance with Section HA of ASME AG-1-2009 with addenda. For ease of inspection and maintenance, the system design should provide for a minimum of 3 feet from mounting frame to mounting frame between banks of components. If components are to be replaced, the dimensions to be provided should be the maximum length of the component plus a minimum of 3 feet. b. The cleanup components (i.e., HEPA filters, prefilters, and adsorbers) that are used during construction of the ventilation systems should be replaced before the system is declared operable. c. Provisions for duct access for maintenance and inspection should be provided in accordance with Section 4.3.4 of National Fire Protection Association (NFPA) 90A, “Standard for the Installation of Air-Conditioning and Ventilation Systems” (Ref. 29). Ductwork should be inspected as needed to ensure continued operability in accordance with the expected design parameters of the system in a postaccident environment. Operating experience, such as that contained in Information Notice 10-27, “Ventilation System Preventative Maintenance and Design Issues,” dated December 16, 2010 (Ref. 30), should be considered. DG-1274, Page 14 6. In-Place Testing Criteria Initial in-place acceptance testing of ESF atmosphere