Document: NRC Regulatory Guide
Document ID: 74c49394-8dbf-46e7-b62a-b85de93b47d8
Document Type: regulatory_guide
Title: Initial Test Programs for Water-Cooled Nuclear Power Plants + HISTORY - HISTORY 11/2012 – DG-1259 , Proposed Revision 4 11/2006 – DG-1166 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A071.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.68
CFR Part: 
CFR Title: 

Content:
on, and Testing Criteria for Air Filtration and Adsorption Units of Normal Atmosphere Cleanup Systems in Light-Water-Cooled Nuclear Power Plants” (Ref. 23). 11 NUREG-1793, “Final Safety Evaluation Report Related to Certification of the AP1000 Standard Design,” Supplements 1 and 2 (Ref. 24) Appendix A to DG-1259, Page A-11 function as designed. In certain designs, normally or intermittently operating systems may be required to shut down and isolate to achieve containment isolation. For example, because of the requirements in GDC 41, “Containment Atmosphere Cleanup,” in Appendix A to 10 CFR Part 50 “the secondary containment ventilation system in BWRs must shut down and isolate the normal ventilation paths to permit the standby gas treatment system to perform its design function .” Therefore, appropriate testing should be conducted to demonstrate the operability of all components, features, and systems required to operate for the primary or secondary containment to function properly. Testing should include expected system configuration for routine testing to verify that bypass flow paths are not introduced and flow pressurization functions are not degraded. Due consideration also should be given to plant features such as heating, ventilation, and air conditioning systems required to maintain environmental conditions within design limits for components or equipment provided to effect containment isolation. Testing should be sufficient to demonstrate redundancy, electrical independence requirements for isolation valves (see footnote 3), and proper operation of features (including proper operation of devices upon loss or failure of motive power) provided for isolation valves and other devices. To the extent practical, the testing should demonstrate that isolation devices perform as required under simulated accident conditions. The following list illustrates the systems, features, and performance demonstrations that should be included in the test program: 1.