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:
pecific data to confirm the scale model testing, structural and acoustic analysis, and CFD results (as applicable) for pressure fluctuations and vibration prior to submitting a power uprate request or proposing a major plant modification. For a power uprate, the extent of the uprate can be considered in determining the detailed analysis and tests necessary to address potential adverse flow effects. 2. Design Load Definition for BWR Steam Dryers. An applicant for the construction and operation of a BWR nuclear power plant and a licensee proposing a power uprate for an operating BWR nuclear power plant are expected to determine the design load definition for the steam dryer up to the full licensed power level. The applicant/licensee uses this design load definition to analyze the BWR steam dryer for American Society of Mechanical Engineers (ASME), Boiler & Pressure Vessel Code (Code) load combinations for limiting transient and accident events, including normal, upset, emergency, and faulted conditions. The stresses due to adverse flow conditions (flow-induced vibrations and acoustic resonances) should be treated as primary stresses and included in ASME Code load combinations. As addressed in SRP Section 3.9.2, the applicant/licensee is expected to validate the method used to determine the steam dryer load definition based on scale model, CFD, or plant data. The BWR applicant is expected to include instrumentation on the steam dryer to measure pressure loading, strain, and vibrations to confirm any scale model testing and/or the results of dynamic and acoustic analysis. The BWR licensee might not need to instrument its original steam dryer for a power uprate, but will be expected to obtain additional necessary plant data at current licensed power conditions (e.g., pressure fluctuations in main steam lines) for use in confirmation of the results of any scale model testing and/or analysis for the steam dryer load definition prior to the power uprate request. 3. BWR