Document: NUREG-0800
Document ID: 81a2e18b-7311-4c4e-822e-8dfe1b0ba7aa
Document Type: srp
Title: REACTOR PRESSURE VESSEL INTERNALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0702/ML070230009.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.5
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for mechanical engineering reviews Secondary - None I. AREAS OF REVIEW Reactor pressure vessel (RPV) internals consist of all structural and mechanical elements inside the reactor vessel. 10 CFR Part 50, Appendix A, General Design Criteria (GDCs) 1, 2, 4, and 10, 10 CFR 50.55a, and 10 CFR Part 52 require that structures and components important to safety be constructed and tested to quality standards commensurate with the importance of the safety functions performed and designed with appropriate margins to withstand effects of anticipated operational occurrences and normal operation, natural phenomena like earthquakes, postulated accidents including loss-of-coolant accidents (LOCA), and events and conditions outside the nuclear power unit. Plant components such as the steam dryer in a boiling water reactor (BWR) nuclear power plant perform no safety functions but must retain their structural integrity to avoid the generation of loose parts that might adversely impact the capability of other plant equipment to perform safety functions. 1Regulatory Guide 1.20 was issued for comment November 2006. A subsequent revision to RG 1.20 is being developed concurrent with the update with this SRP section. 3.9.5-2 Revision 3 - March 2007 For the purpose of this standard review plan (SRP) section, the term "reactor internals" includes core support and other internal structures and refers to all structural and mechanical elements inside the RPV with the exception of the following: 1. Reactor fuel elements and the reactivity control elements out to the coupling interfaces with the drive units (the fuel system design is covered in SRP Section 4.2, but the structural aspects of reactor fuel assemblies are reviewed with the reactor internals in this SRP section). 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