Document: NUREG-0800
Document ID: 6ef15e93-eb75-46bf-be7e-34634d0c6d28
Document Type: srp
Title: SITE PROXIMITY MISSILES (EXCEPT AIRCRAFT)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070510635.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.5
CFR Part: 
CFR Title: 

Content:
per year, the risk of damage from explosions is sufficiently low. Regardless of the source of site proximity missiles, missile hazards that have the potential to cause onsite accidents leading to the release of significant quantities of radioactive fission products, thus posing an undue risk of public exposure, should have a sufficiently low probability of occurrence. Meeting the probability objective for site proximity missiles and the 10 CFR Part 100 exposure guidelines provides a high level of assurance that individuals will not be exposed to excessive radiation doses. 2. Because of the low probabilities of the events under consideration, data are often not available to permit accurate calculation of probabilities. Accordingly, the expected rate of occurrence of potential exposures in excess of the 10 CFR Part 100 guidelines of an order of magnitude of 10-6 per year is acceptable if, when combined with reasonable qualitative arguments, the realistic probability can be shown to be lower (see guidance in SRP Section 2.2.3). 3. GDC 4 requires that SSCs important to safety be appropriately protected against dynamic effects, including the effects of missiles that may result from events and conditions outside the nuclear plant. Offsite activities that are determined to be a design-basis event, such as an explosion, could have the potential for missile generation. The initiation of externally generated missiles is a dynamic event and the effects of those missiles on SSCs important to safety must be evaluated. Protecting those SSC that are important to safety from the effects of externally generated missiles prevents failure of those systems required for safe-shutdown capabilities and prevents the release of radioactivity which might cause doses in excess of the 10 CFR Part 100 guidelines. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the