Document: NUREG-0800
Document ID: dfb421c6-cf9c-447e-ab71-dd0426ce50e5
Document Type: srp
Title: TURBINE MISSILES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340523.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.3
CFR Part: 
CFR Title: 

Content:
ent information has been provided and that the review and calculations support conclusions of the following types: 1. The staff concludes that the turbine missile risk for the proposed plant design is acceptable and meets the requirements of General Design Criterion 4. This conclusion is based on the applicant having suf- ficiently demonstrated to the staff in accordance with Regulatory Guide 1.115 that the probability of turbine missile damage to structures, systems, and components important to safety (i.e., those listed in Regulatory Guide 1.117) is acceptably low. 2. The staff concludes that the turbine missile risks for the proposed plant designs are too high and do not meet the requirements of General Design Criterion 4; Additional protection against turbine missiles is required in order to reduce the overall risk. The applicant should comply with Regulatory Guide 1.115 (turbine reorientation, vulnerable system relocation, missile barriers, overspeed protection, turbine disc integrity and inservice inspection, or other appropriate measures may be recommended). V. IMPLEMENTATION The following is intended to provide guidance to applicants and licensees regarding the NRC staff's plans for using this SRP section. Except in those cases in which the applicant proposes an acceptable alternative method for complying with specified portions of the Commission's regulations, the method described herein will be used by the staff in its evaluation of conformance with Commissi6n regulations. Implementation schedules for conformance to parts of the method discussed herein are contained in the referenced regulatory guides. VI. REFERENCES 1. 10 CFR Part 50, Appendix A, General Design Criterion 4, "Environmental and Missile Design Bases." 2. Regulatory Guide 1.115, "Protection Against Low-Trajectory Turbine Missiles." 3. Regulatory Guide 1.117, "Tornado Design Classification." 4.. S. H. Bush, "Probability of Damage to Nuclear Components," Nuclear Safety, Vol. 14, No. 3, May-June