Document: NUREG-0800
Document ID: 91ccd6ba-6094-458e-842b-ff5e6b11f635
Document Type: srp
Title: INTERNALLY GENERATED MISSILES (OUTSIDE CONTAINMENT)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070370.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.1
CFR Part: 
CFR Title: 

Content:
protection in accordance with General Design Criterion 4, with respect to protecting structures, systems, and componentsSSC important to safety against the effects of 17 internally generated missiles that may result from equipment failures, in order to maintain their essential safety functions. Acceptance is based on the design meeting the guidelines of Regulatory Guide 1.115, as related to the identification and protection of SSC important to safety from the effects of turbine missiles, and the NRC staff verification that the applicant's essential SSC important to safety will be protected from internally generated missiles (outside 18 containment) by location in individual missile-proof structures or by special localized protective shields or barriers. 3.5.1.1-3 DRAFT Rev. 3 - April 1996 Technical Rationale:19 The technical rationale for application of the above acceptance criteria to internally generated missiles (outside containment) is discussed in the following paragraph. GDC 4 establishes requirements regarding the ability of SSC important to safety to be protected from dynamic effects, including the effects of internally generated missiles. The potential for generating missiles may result from equipment failure outside of the containment and internal to the facility such as pressurized components, high-energy piping and rotating equipment. The initiation of an internally generated missile is a dynamic effect of such failures and the impact of those missiles on SSC important to safety must be evaluated. Regulatory Guide 1.115 describes methods acceptable to the NRC staff for identification and protection of SSC important to safety from the effects of missiles resulting from turbine failure. Cumulative failure data for conventional plants indicate that the protection of SSC important to safety from the effects of missiles is an appropriate safety consideration. Protecting those SSC that are important to safety from the effects of internally generated missiles