Document: NRC Regulatory Guide
Document ID: 4f130c35-25dc-4950-b437-3801efdab5f6
Document Type: regulatory_guide
Title: Protection Against Extreme Wind Events and Missiles for Nuclear Power Plants (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1435/ML14356A107.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.117
CFR Part: 
CFR Title: 

Content:
il pdr.resource@nrc.gov. App. A to DG-1313, Page A-1 APPENDIX A STRUCTURES, SYSTEMS, AND COMPONENTS TO BE PROTECTED AGAINST EXTREME WIND EVENTS (TORNADO AND HURRICANE) This appendix provides a minimum list of structures, systems, and components (SSCs), which together with their foundations and supports, should be protected from the extreme wind events, including generated missiles, without loss of capability to perform their safety functions. In addition, SSCs that are not on the list but are necessary to meet the requirements outlined in Section C of this guide should also be protected against extreme wind events. 1. the reactor coolant pressure boundary.4 2. those portions of the main steam and main feedwater systems5 in pressurized-water reactors (PWRs) up to and including the outermost isolation valves. 3. the reactor core and individual fuel assemblies, at all times, including during refueling. 4. systems or portions of systems that are required for (1) attaining safe shutdown, (2) residual heat removal, (3) cooling the spent fuel storage pool, (4) mitigating the consequences of a tornado-caused PWR steam line break,6 (5) makeup water for the primary system, and (6) supporting the above systems, e.g., cooling water, ultimate heat sink, air supply, auxiliary feedwater, and ventilation. 5. the spent fuel storage pool, to the extent necessary to preclude significant loss of watertight integrity of the storage pool and to prevent missiles from contacting fuel within the pool. 6. the reactivity control systems, e.g., control rod drives and boron injection system. 7. the control room, including all equipment needed to maintain the control room within safe habitability limits for personnel and safe environmental limits for protected equipment. 8. those portions of the gaseous radwaste treatment system whose failure caused by tornado or hurricane effects could result in potential offsite exposures in excess of the criterion given in subitem (3) of the regulatory