Document: NUREG-0800
Document ID: 621763b9-bd48-4ded-8c42-b942a23a06d4
Document Type: srp
Title: – 15.2.5
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070680.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.1
CFR Part: 
CFR Title: 

Content:
flow. All these 1 postulated transients have been reviewed. It was found that the most limiting in regard to core thermal margins and pressure within the reactor coolant and main steam systems was the ________ transient. This transient was evaluated by the applicant using a mathematical model that had been previously reviewed and found acceptable by the staff. The parameters used as input to this model were reviewed and found to be suitably conservative and in accordance with the recommendation of Regulatory Guide 1.105. The results of the analysis of the ____________ transient showed that cladding integrity was maintained by ensuring that the maximum departure from nucleate boiling ratio (or minimum critical heat ratio for a BWR) did not decrease below ______, and that the maximum pressure within the reactor coolant and main steam systems did not exceed 110% of their design pressures.52 The transient initiating events that might be expected to occur with moderate frequency are: – turbine trip, – loss of external load, – steam pressure regulator malfunctions, – main steam isolation valve closure (in BWRs), – loss of condenser vacuum, – loss of nonemergency ac power to the station auxiliaries, and – loss of normal feedwater flow. 2 In a review of the transients that could result from these postulated events, it was found that the most limiting in regard to core thermal margins and pressure within the reactor coolant and main steam systems was the ________ transient. This transient was evaluated by the applicant using a mathematical model that had been previously reviewed and found to be acceptable by the staff. The parameters used as input to this model were 15.2.1-11 DRAFT Rev. 2 - April 1996 reviewed and found to be suitably conservative and in accordance with the recommendation of Regulatory Guide 1.105. The results of the analysis of the ____________ transient showed that cladding integrity was maintained by ensuring that the maximum departure from