Document: NUREG-0800
Document ID: 77e928bd-5fcf-425f-b8c0-85215a64682f
Document Type: srp
Title: INTERNALLY-GENERATED MISSILES (INSIDE CONTAINMENT)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380167.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.2
CFR Part: 
CFR Title: 

Content:
If the probability of occurrence is greater than 10-7 per year, the probability that it will impact a significant target is determined. If the product of these two probabilities is less than 10-7 per year, the missile is not considered significant. If the product is greater than 10-7 per year, the probability of significant damage is determined. If the combined probability (product of all three) is less than 10-7 per year, the missile is not considered significant. If the combined probability is greater than 10-7 per year, missile protection of SSCs important to safety, and of nonsafety -related SSCs whose failure could affect an intended safety function of the safety related SSCs, should be provided by one or more of the six methods listed below. 2. The missile protection for SSCs important to safety is adequate if provided by one or more of the following methods: (1) locating the system or component in a missile-proof structure, (2) separating redundant systems or components for the missile path or range, (3) providing shields and barriers for systems and components, (4) designing the equipment to withstand the impact of the most damaging missile, (5) providing design features to prevent the generation of missiles, or (6) orienting missile sources to prevent missiles from striking equipment important to safety. In summary, an Safety Analyses Report (SAR) statement that SSCs important to safety will be afforded protection by locating them in individual missile-proof structures, physically separating redundant systems or system components, or providing special protective shields or barriers is an acceptable method to meet this criterion. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. 10 CFR Part 50, Appendix A, GDC 4 establishes requirements for the ability of SSCs important to safety to be protected from dynamic effects,