Document: NUREG-0800
Document ID: 2c839e4a-a342-4e25-9a7c-82d678a0f754
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340657.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6
CFR Part: 
CFR Title: 

Content:
rding the design margin for Mark I, II and III plants at the operating license stage of review, the peak calculated values of pressure and temperature for the drywell and wetwell should not exceed the respective design values. Also, the peak deck differential pressure for Mark II plants should not exceed the design value. Acceptable methods for the calculation of Mark I, II and III containment environmental response to loss-of-coolant accidents are found in NUREG-0588 (Ref. 35). For Mark III plants, the calculated results for drywell pressure and temperature, containment pressure and temperature, and differential pres- sure between the drywell and containment should be based on the General Electric Mark III analytical model (Ref. 23) that was used in the Grand Gulf analysis and evaluated by CSB. The use of this model at the construc- tion permit stage is acceptable if an appropriate margin (see below) between the calculated and design differential pressures is used. The Mark III analytical model -have been verified by the large-scale Mark III test results. If an analytical model other than the General Electric Mark III analytical model identified above is used, the model should be demonstrated to be physically appropriate and conservative to the extent that the General Electric model has been found acceptable. In addition, it will be necessary to demonstrate its performance with suitable test data in a manner similar to that described above. For Mark III plants at the construction permit stage, the containment design pressure should provide at least a 15% margin above the peak 6.2.1.1.C-3 Rev. 6 - August 1984 calculated containment pressure, and the design differential pressure between drywell and containment should provide at least a 30% margin above the peak calculated differential pressure. For Mark I, II and III plants at the operating license stage, the peak calculated containment pressure and differential pressure should be less than the design values. In