Document: NUREG-0800
Document ID: 7c104096-d040-463a-a94b-a0af08ab3478
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0702/ML070230008.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
nternal pressure. Strain gages should be calibrated according to the MSL dimensions (diameter, thickness, and static pressure). Alternatively, pressure measurements made with transducers flush-mounted against the MSL internal surface may be used. The effects of flow turbulence on any direct pressure measurements should be considered, however. (c) The speed of sound in any acoustic models should not be changed from plant to plant but rather be a function of temperature and steam quality. (d) Reflection coefficients at any boundary between steam and water should be based on rigorous modeling or on direct measurement. The uncertainty of the reflection coefficients should be clearly defined. (e) Any sound attenuation coefficients should be a function of steam quality (variable between the chimney and reactor dome) rather than constant throughout a steam volume (like the volume within the RPV). 3.9.2-19 Revision 3 - March 2007 (f) Once validated, the same speed of sound, attenuation coefficient, and reflection coefficient should be used in other plants; however, different flow conditions (temperature, pressure, quality factor) may require adjustments of these parameters. (4) Response-deduction method: based on a derivation of response characteristics from plant or SMT data, forcing functions should be formulated; however, as such functions may not be unique and are also expected to depend on material properties and loss factors, the computational procedures and the basis for selection of the representative forcing functions should be described together with all bias errors and uncertainties (see subsection II.3.B.(ii)(1) of this SRP section, “Scale Model Tests,” for guidelines on inferring forcing functions from plant or scale model testing data). Alternately, the applicant/licensee may use other approaches to formulate the forcing function. However, sufficient supporting justification should be provided to demonstrate that the selected approach is technically sound