Document: NUREG-0800
Document ID: 0c95c042-addf-4bad-84f5-1d1692769268
Document Type: srp
Title: CONCRETE AND STEEL INTERNAL STRUCTURES OF STEEL OR CONCRETE
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550052.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.3
CFR Part: 
CFR Title: 

Content:
hniques are also reviewed on a case-by-case basis. See Section II.4.E of this SRP section for further information. 7. Testing and Inservice Surveillance Requirements. BWR containment drywells, such as those used for the Mark III containment, should be subjected to a structural proof test. Such a test is acceptable if found to be in accordance with the following: A. The drywell should be subjected to an acceptance test that increases the drywell internal pressure in three or more approximately equal pressure increments ranging from atmospheric pressure to at least the design pressure. The drywell should be depressurized in the same number of increments. Measurements should be recorded at atmospheric pressure and at each pressure level of the pressurization and depressurization cycles. At each level, the pressure should be held constant for at least 1 hour before the deflections and strains are recorded. 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: 3.8.3-27 Revision 2 - March 2007 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