Document: NRC Regulatory Guide
Document ID: 32d3a378-d575-45ef-9631-a8d6c2b6c30a
Document Type: regulatory_guide
Title: Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants + HISTORY - HISTORY 08/2016 – Periodic Review of Revision 1 – Issues identified for future consideration 08/2011 – Periodic Review of Revision 1 – No issues identified 01/2006 – DG-1143 , Proposed Revision 1 Prior to the issuance of DG-1143, RG 1.76 was entitled "Design-Basis Tornado for Nuclear Power Plants" (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1620/ML16208A347.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.76
CFR Part: 
CFR Title: 

Content:
Enclosure: As stated CONTACT: Brad Harvey, NRO/DSEA 301-415-4118 DISTRIBUTION: Tom Boyce, RES RES RGGIB PM ADAMS Accession No: ML16208A347 OFFICE NRO/DSEA/RHM1/RMOT BC:NRO/DSEA/RHM1: DD: NRO/DSEA NAME BHarvey/vm CCook SFlanders DATE 07/26/2016 07/27/2016 08/15/2016 OFFICIAL RECORD COPY Regulatory Guide Periodic Review Regulatory Guide Number: 1.76, Revision 1 Title: Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants Office/Division/Branch: NRO/DSEA/RHM1/RMOT Technical Lead: Brad Harvey Staff Action Decided: Reviewed, issues identified for future consideration 1. What are the known technical or regulatory issues with the current version of the Regulatory Guide (RG)? Revision 1 to RG 1.76, “Design-Basis Tornado and Tornado Missiles for Nuclear Power Plants,” was published in March 2007. The RG provides guidance that the NRC staff considers acceptable for use in selecting the design-basis tornado and design-basis tornado-generated missiles that a nuclear power plant should be designed to withstand to prevent undue risk to the health and safety of the public. Nuclear power plants must be designed so that they remain in a safe condition under extreme meteorological events, including those that could result in a severe tornado that could reasonably be predicted to occur at the site. The design-basis tornado wind speeds presented in this regulatory guide are based on Revision 2 of NUREG/CR-4461 (ML070810400). The tornado database used in Revision 2 of NUREG/CR-4461 includes information recorded for more than 46,800 tornado segments occurring from January 1, 1950, through August 31, 2003. Currently various reviews are in progress that are assessing the methodology for defining tornado risk. For example, the National Institute of Standards and Technology (NIST) is in the middle of a four-year effort to develop new tornado hazards maps for the U.S. and the American Society of Civil Engineers (ASCE) has recently convened a standards committee working group