Document: NUREG-0800
Document ID: 2781386f-8b2c-401b-814a-d98c9381a202
Document Type: srp
Title: STRUCTURES, SYSTEMS, AND COMPONENTS TO BE PROTECTED FROM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070307.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.2
CFR Part: 
CFR Title: 

Content:
egulatory Guide 1.27, as related to the ultimate heat sink and connecting conduits being capable of withstanding the effects of externally generated missiles; Regulatory Guide 1.115, as related to the protection of SSC important to safety from the effects of turbine missiles; and Regulatory Guide 1.117, as related to the protection of SSC important to safety from the effects of tornado missiles. 15 Technical Rationale:16 The technical rationale for application of the above acceptance criteria to SSC to be protected from externally generated missiles is discussed in the following paragraphs. 3.5.2-3 DRAFT Rev. 3 - April 1996 1. GDC 2 establishes requirements regarding the ability of SSC important to safety to withstand natural phenomena without the loss of capability to perform their safety functions. This criterion applies directly to the assessment of SSC in regard to external missiles generated by natural phenomena. Application of GDC 2 ensures that the chosen design basis reflects the importance of the safety functions to be performed. Regulatory Guide 1.13 describes a method acceptable to the NRC staff for protecting spent fuel pool systems and structures from externally generated missiles and preventing mechanical damage to the spent fuel. Mechanical damage to the spent fuel is prevented by designing the facility to prevent externally generated missiles from contacting the spent fuel within the pool. Identifying the systems and structures that prevent mechanical damage to the spent fuel allows for proper designation of the SSC to be protected from externally generated missiles. Regulatory Guide 1.27 describes a method acceptable to the NRC staff for protecting the ultimate heat sink and connecting conduits from the effects of externally generated missiles. The ultimate heat sink constitutes the source of water supply necessary to safely operate, shutdown and cool down a nuclear plant. Because the ultimate heat sink is important to safety, its SSC important to