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:
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 identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. The identification and description of events that could possibly generate missiles is evaluated based on a review of the safety analysis report (SAR) in accordance with SRP Sections 2.2.1-2.2.2 and 2.2.3. 2. The SSCs identified in accordance with SRP Section 3.5.2 are reviewed with respect to missile vulnerability. Using experience gained from past reviews of similar SSCs on missile interactions and the evaluation of the applicant’s information, a determination is made of those portions of the plant that clearly have the potential for unacceptable missile damage. If all SSCs appear to be adequately protected against the effects of the postulated missiles, then the review is terminated and the evaluation findings are written in terms of design-basis considerations (see Subsection II.2 of this SRP section). 3.5.1.5-5 Revision 4 - March 2007 3. The total probability of the missiles striking a vulnerable critical area of the plant is estimated. The total probability per year ( ) may be estimated using the following PT expression: P P P P P N T E MR SC p = × × × × where: = probability per year of design-basis event obtained from the review PE performed under SRP Section 2.2.3 = probability of missiles reaching the plant PMR = probability of missiles striking a vulnerable critical area of the plant PSC = probability of missiles exceeding the energies required to penetrate to Pp vital areas (e.g., based on wall thickness provided for tornado missiles) or producing secondary missiles that could