Document: NUREG-0800
Document ID: 339b5072-d5b1-47d7-9002-e7b942ab753b
Document Type: srp
Title: II.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070311.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.3.8
CFR Part: 
CFR Title: 

Content:
ACCEPTANCE CRITERIA SEB The ECGB accepts the design of structures, shields, and barriers that must withstand the 9 effects of environmental and natural phenomena if the relevant requirements of General Design Criteria 2 (Ref. l) and 4 (Ref. 2) are met. The relevant requirements of General Design 10 11 Criteria 2 and 4 are as follows: A. General Design Criterion 2 (GDC 2) as it relates to structures, systems, and 12 components; capability to withstand, without loss of safety functions, the effects of tornadoes; and the appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena. B. General Design Criterion 4 (GDC 4) as it relates to structures, systems, and components 13 being appropriately protected against dynamic effects, including the effects of missiles, pipe whipping, and discharging fluids that may result from equipment failures and from events and conditions outside the nuclear power unit. Specific criteria necessary to meet the relevant requirements of General Design Criteria 2 and 4 are as follows: 1. For Local Damage Prediction a. In Concrete Sufficient thickness of concrete should be provided to prevent perforation, spalling, or scabbing of the barriers in the event of missile impact. Several empirical equations, such as the modified National Defense Research Council (NDRC) formula (Ref. 3) are available to estimate missile penetration 14 into concrete. These equations should be used to determine the required barrier thicknesses. Thicknesses resulting from such calculations should in no case not15 be less than those listed in Table 1, which specifies the minimum thicknesses are16 necessary to protect against tornado missiles. The tornado missile spectrum for which Table 1 concrete barrier thickness17 requirements are adequate is shown in Table 2. Tornado missiles and other types of missiles are specified in accordance with SRP Section 3.5.1 Sections 3.5.1.1 through 3.5.1.6.18 3.5.3-3 DRAFT Rev. 2 -