Document: NUREG-0800
Document ID: cb58882e-0e3d-4a21-bffc-b5cc5a9428f6
Document Type: srp
Title: REACTOR PRESSURE VESSEL INTERNALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070367.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.5
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Mechanical Engineering Branch (EMEB)1 Secondary - None I. AREAS OF REVIEW Reactor pressure vessel internals consist of all the structural and mechanical elements inside the reactor vessel. General Design Criteria 1, 2, 4 and 10 and 10 CFR Part 50, §50.55a require that structures and components important to safety shall be constructed and tested to quality standards commensurate with the importance of the safety functions to be performed, and 2 designed with appropriate margins to withstand effects of anticipated operational occurrences, normal plant operational occurrencesoperation; natural phenomena such as earthquakes; 3 postulated accidents including loss-of-coolant accidents (LOCA), and from events and conditions outside the nuclear power unit. For the purpose of this standard review plan section, the term "reactor internals" includes core support structures and other internal structures and refers to all structural and mechanical elements inside the reactor pressure vessel with the exception of the following: 1. Reactor fuel elements, and the reactivity control elements out to the coupling interfaces 4 with the drive units (the fuel system design is covered in Standard Review Plan (SRP) Section 4.2, but the structural aspects of reactor fuel assemblies are reviewed with the reactor internals). DRAFT Rev. 3 - April 1996 3.9.5-2 2. Control rod drive elements (the drive elements inside the guide tubes are covered in SRP Section 3.9.4, but the guide tubes are reviewed with the reactor internals). 3. In-core instrumentation (in-core instrumentation support structures are reviewed with the reactor internals). The staff review includes the following specific areas: a. The physical or design arrangements of all reactor internals structures, components, assemblies, and systems should be presented , including the manner of positioning and 5 securing such items within the reactor pressure vessel, the manner of providing for axial and