Document: NRC Regulatory Guide
Document ID: 46b2c829-ce4c-4a6a-8a01-908725558ffe
Document Type: regulatory_guide
Title: Volcanic Hazards Assessment for Proposed Nuclear Power Reactor Sites + HISTORY - HISTORY 03/2020 – DG-4028-Proposed New Guide
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML2000/ML20007D621.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.26
CFR Part: 
CFR Title: 

Content:
ng the likelihood of successful mitigation of potential volcanic hazards, the volcanic hazards assessment should develop additional risk insights that consider the likelihood of successful mitigation. If the reevaluated risk insights are acceptable for SSC performance during a volcanic event, then no further volcanic hazards assessment is warranted. If the risk insights are unacceptable, the volcanic hazards assessment should consider developing alternative siting criteria that reduce volcanic hazard to acceptable levels. DG-4028, Page 20 Consideration of Alternative Sites After completing all the steps of the volcanic hazards assessment, and the outcome of the volcanic hazards assessment indicates that volcanic hazards are beyond the facility’s design basis and cannot be mitigated effectively, then alternative sites should be investigated. Unlike most other natural hazards, most volcanic hazards are spatially restricted. For some site locations, the NRC staff notes that alternative sites with significantly lower levels of volcanic hazard might be located within several miles, or less, of the unacceptable site. DG-4028, Page 21 D. IMPLEMENTATION The methods described in this regulatory guide will be used in evaluating applications for construction permits, early site permits, combined licenses, and limited work authorizations, which includes information under 10 CFR 51.49(b) or (f), with respect to compliance with applicable regulations governing the siting of new nuclear power plants and testing facilities, unless the applicant proposes an acceptable alternative method for complying with those regulations. Methods that differ from those described in this regulatory guide may be deemed acceptable if the applicant provides sufficient basis and information for the NRC staff to verify that the proposed alternative complies with the applicable NRC regulations. DG-4028, Page 22 REFERENCES2 U.S. Nuclear Regulatory Commission Documents NUREG-Series Reports NRC 2003,