Document: NUREG-0800
Document ID: f67aa461-7df8-4c03-bc1e-abd20ed45420
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A365.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.1
CFR Part: 
CFR Title: 

Content:
Draft Revision 4 - December 2012 containments is to estimate the capacity based on attaining a maximum global membrane strain away from discontinuities (i.e., the hoop membrane strain in a cylinder) of 0.8 percent. This strain limit is applicable to all materials which contribute to resisting the internal pressure (i.e., tendons, rebars, and liner (if considered)). When calculating the pressure capacity contribution from the tendons, the above-specified strain limit is applicable to the full range of strain (from 0.0 psi at 0.0-percent strain up to the tendon contribution to pressure capacity at 0.8-percent strain). The other items described previously for reinforced concrete containment, after the first paragraph identifying global strain limits, are also applicable to the approach used for prestressed concrete containments. The criteria presented for consideration of nonlinear material behavior of the reinforcing steel also apply to the tendons. iii. Containment Penetrations The methodologies described above apply to the containment structure. A complete evaluation of the internal pressure capacity must also address major containment penetrations, such as the removable drywell head and ventlines for BWR designs, equipment hatches, personnel airlocks, and major piping penetrations. The analysis should also address other potential containment leak paths through mechanical and electrical penetrations. v. Special Considerations for Steel Elliptical and Torispherical Heads Under internal pressure, a potential failure mode of steel ellipsoidal and torispherical heads is buckling, resulting from a hoop compression zone in the knuckle region. The analysis needs to evaluate this potential mode of failure to determine if it is the limiting condition for the pressure capacity of the containment. The analysis should consider nonlinear material and geometric behavior and address the effect of initial geometric imperfections either explicitly (direct modeling) or implicitly