Document: NUREG-0800
Document ID: 5e3dbec9-a39f-4531-9eb9-705982190066
Document Type: srp
Title: REACTOR PRESSURE VESSEL INTERNALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16134A059.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.5
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Content:
esses in the reactor internal components and structures, validation of the modeling procedures for the analyses should be presented along with bias errors and uncertainties. The validation may include comparisons of simulated natural frequencies, mode shapes, and frequency response functions with experimental results. The NRC staff reviewer will use the provisions in Regulatory Guide (RG) 1.20 in the evaluation of the applicant’s development and validation of computational models for structural dynamic analysis, and the review of structural models. The staff reviewer will also use the provisions in RG 1.20 in evaluating the applicant’s determination of appropriate bias errors and random uncertainties associated with computational models. As part of this review, the staff reviewer will evaluate the applicant’s demonstration of stress convergence near critical regions, such as welds and other joints. 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 FIV, AR, AIV, and MIV) are addressed in SRP Section 3.9.2. 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 (BPV Code) and discussed in SRP Section 3.9.3), and stress intensity or deformation limits. Design or service loadings should include safe shutdown earthquake (SSE) and operating basis earthquake (OBE) loads, as appropriate. 6. 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,