Document: NUREG-0800
Document ID: a09b1666-b289-4ea9-9e8f-3ee5fbd5bf41
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A250.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
ed. B. So that the overall deflection pattern can be determined in prototype drywells, radial deflections should be measured at a minimum of three points along each of at least three meridians equally spaced around the drywell, including locations with varying stiffness characteristics. Radial deflections should be measured at the lower vent region, about mid-height, and near the top of the cylindrical design. Measurement points may be relocated, depending on the distribution of stresses and deformations anticipated in each particular design. C. In prototype drywells only, strain measurements sufficient to permit an evaluation of strain distribution should be recorded for at least two opposing meridians at the following locations on the wall: i. At the bottom of the wall ii. At mid-height of the wall These strain measurements should be made at a minimum of three positions within the wall section - one at the center and one each near the inner and outer surfaces. D. In nonprototype drywells, deflection and strain measurements need not be made if strain levels have been correlated with deflection measurements during the acceptance test of a prototype drywell when measured strains and deflections are within the predefined tolerance of their predicted responses. Any reliable 3.8.3-28 Revision 4 – September 2013 system of displacement meters, optical devices, strain gauges, or other suitable apparatus may be used for the measurements. E. If the test pressure drops as a result of unexpected conditions to or below the next lower pressure level, the entire test sequence should be repeated. Significant deviations from the previous test should be recorded and evaluated. F. If any significant modifications or repairs are made to the drywell following, and because of, the initial test, the test should be repeated. G. A description of the proposed acceptance test and instrumentation requirements should be included in the preliminary SAR. H. The following information should be