Document: NUREG-0800
Document ID: 6b7eddf4-f7ce-4821-9f11-e37070221e57
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16133A418.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
mate the forcing functions on steam dryers. This approach is aided by measurements of fluctuating pressures either (a) on dryer surfaces, or (b) within the MSLs connected to the RPV and/or (c) surface strains and vibrations on the dryer structure itself. If the dynamic analysis of reactor internals or a steam dryer is based on such an approach, the review should include the following: (1) The benchmarking procedure together with all modeling parameters, bias errors and uncertainties. (2) The location, selection, and mounting procedure of sensors (in particular, strain gages, pressure transducers, and accelerometers) together with the measures taken to provide sufficient redundancy. (3) The acoustic modeling parameters (e.g., speed of sound, sound attenuation, and reflection coefficient) that are determined from the benchmarking procedure. (4) The mesh of the acoustic model, its conformity to the plant geometry, and the adequacy of its mesh density. 3.9.2-8 Revision 4 – March 2017 (5) The structural modeling parameters and boundary conditions. (6) The mesh of the structural model, its conformity to the component geometry, and the adequacy of its mesh density. (iv) Acoustic and vibration forcing functions generated by RRPs on SSCs should be reviewed. This includes pressure pulsation at the vane passing frequency (VPF) of the pump and its higher harmonics and mechanical vibration at the pump rotor rotation speed. When the forcing functions of the RRPs are reviewed, the following items should be addressed: (1) The data used to formulate the RRP forcing functions. (2) The frequency range of pump excitations, in comparison to the structural and acoustic resonance frequencies of reactor and piping components. (3) The number and distribution of the operating pumps which are used to develop the forcing functions. For further details, refer to RG 1.20, Revision 4, Section C.2.1.2. C. Results of vibration and stress calculations. The calculated vibration and stress levels of