Document: NUREG-0800
Document ID: 5c84a1c2-9405-4849-8c5f-415a0bb66a22
Document Type: srp
Title: in connection with reactor internals.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070337.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.5
CFR Part: 
CFR Title: 

Content:
nd emergency core cooling system connections to the reactor coolant system (References 12 and 13).114 The design and service stress limits specified by the Code do not assureensure, in themselves, the operability of components, including their supports, to perform the mechanical motion required to fulfill the component's safety function. Certain of the service stress limits specified by the Code (i.e., level C and D) may not assureensure the functional capability of components, including their supports, to deliver rated flow and retain dimensional stability. Since theThe combination of loadings, the selection of the applicable design and service stress limits appropriate to each load combination, and the proper consideration of operability is beyond the scope of the Code.; and the The treatment of functional capability, including collapse and deflection limits, is not adequately treated by the Code for all situations. , suchSuch factors mustshould be 115 evaluated by designers and appropriate information developed for inclusion in the 116 Design Specification or other referenced documents. Applicants require guidance with regard to the selection of acceptable design and service stress limits associated with various loadings and combinations thereof, resulting from plant and system operating conditions and design basis events, natural phenomena, and DRAFT Rev. 2 - April 1996 3.9.3-20 site-related hazards. The relationship and application of the terms "design conditions," "plant operating conditions," "system operating conditions," and the formerly used term "component operating conditions," now characterized by four levels of service stress limits, have not been clearly understood by applicants and their subcontractorsrequire clarification.117 For example, under the "faulted plant or system condition" (e.g., due to LOCA within the reactor coolant pressure boundary), the emergency core cooling system (ECCS) should be designed to operate and deliver rated flow for an