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:
hods (e.g., the finite element method) are used to determine stresses in the reactor internal components and structures, validation of the modeling procedures for the analyses should be presented. The validation may include comparisons of simulated natural frequencies, mode shapes, and frequency response functions with experimental results. 3.9.5-3 Revision 3 - March 2007 4. The design bases for the mechanical design of the reactor vessel internals, including such allowable limits as maximum allowable stresses; stability under dynamic loads; deflection, cycling, and fatigue limits; and core mechanical and thermal restraints (positioning and holddown). Details of dynamic analyses, input forcing functions, and response to loadings (including those due to adverse flow effects) are addressed in SRP Section 3.9.2. Justification for the structural damping value(s) for the dynamic analyses should be provided. The bias errors and random uncertainties of dynamic analysis should be listed. 5. Each combination of design and service loadings, categorized by allowable design or service limits (defined in the American Society of Mechanical Engineers (ASME), Boiler and Pressure Vessel Code (Code) and SRP Section 3.9.3), and stress intensity or deformation limits. Design or service loadings should include safe shutdown earthquake and operating basis earthquake loads as appropriate. 6. Potential adverse flow effects on the reactor pressure vessel internals including the steam dryer in BWRs (See the Appendix A of this SRP Section, SRP Section 3.9.2, and RG 1.20). 7. Inspections, Tests, Analyses, and Acceptance Criteria (ITAAC). For design certification (DC) and combined license (COL) reviews, the staff reviews the applicant's proposed ITAAC associated with the structures, systems, and components (SSCs) related to this SRP section in accordance with SRP Section 14.3, "Inspections, Tests, Analyses, and Acceptance Criteria." The staff recognizes that the review of ITAAC cannot be