Document: NUREG-0800
Document ID: 97042a9a-9f44-4236-9cce-9d73fdf3fef0
Document Type: srp
Title: STEEL CONTAINMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340577.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.2
CFR Part: 
CFR Title: 

Content:
onditions The load combinations in these cases correspond to and include Level A service limits, Level B service limits, Level C service limits, Level D service limits and the post-flooding condition. The loads may be combined by their actual time history of occurrence taking into consideration their dynamic effect upon the structure. (a) Level A Service Limits These service limits are applicable to the service loadings to which the containment is subjected including the plant or system design basis accident conditions for which the containment function is required excepting only those categorized as Level B, Level C, Level D, or Testing Loadings. The loading combinations corresponding to these limits include the following: (1) Normal operating plant condition D + L + T0 + Ro + P0 (2) Operating plant condition in conjunction with multiple safety relief valves actuation D + L + T + R + P (3) Loss-of-coolant accident (LOCA) D + L + Ta + Ra Pa 3.8.2-9 Rev. 1 - July 1981 (4) Multiple SRV actuations in combination with small- break accident or intermediate-break accident D + L + T + R + P + T + R P a a a s s s (b) Level B Service Limits These service limits include the loads subject to Level A service limits plus the additional loads resulting from natural phenomena during which the plant must remain operational. The loading combinations corresponding to these limits include the following: (1) LOCA in combination with operating basis earthquake D + L + Ta + Ra + Pa + E (2) Operating plant condition in combination with operating basis eathquake D + L + T0 + R + P0 +E (3) Operating plant condition in combination with operating basis earthquake and multiple SRV actuations D+ L + T + R + P + E (4) LOCA in combination with a single active component failure causing one SRV discharge D + L + T + P + R T +R 4 P a a a s s s (c) Level C Service Limits These service limits include the loads subject to Level A service limits plus the additional loads resulting from natural phenomena