Document: NUREG-0800
Document ID: 16afcc26-09c8-4627-8906-8c56ffe8434b
Document Type: srp
Title: LOSS OF NORMAL FEEDWATER FLOW
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070683.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.7
CFR Part: 
CFR Title: 

Content:
combination with any single active component failure, or single operator error, shall be considered and is an event for which an estimate of the number of potential fuel failures shall be provided for radiological dose calculations. For such accidents, fuel failure must be assumed for all rods for which the DNBR or CPR falls below those values cited above for cladding integrity unless it can be shown, based on an acceptable fuel damage model (see SRP Section 4.2), that fewer failures occur. There shall be no loss of function of any fission product barrier other than the fuel cladding. e. To meet the requirements of General Design Criteria 10 and 15, the positions of Regulatory Guide 1.105, "Instrument Spans and Setpoints, are used with regard to DRAFT Rev. 2 - April 1996 15.2.7-6 their impact on the plant response to the type of transient addressed in this SRP section. f. The most limiting plant systems single failure, as defined in the "Definitions and Explanations" of Appendix A to 10 CFR Part 50, shall be identified and assumed in the analysis and shall satisfy the positions of Regulatory Guide 1.53 and GDC 17.24 3. The applicant's analysis of the loss of normal feedwater transient should be performed using an acceptable analytical model. Models which have been approved by the NRC are identified in References 2 through 8. References 20 through 24 are acceptable computer codes for non-LOCA transient analyses for system 80+ applications. References 25 25 and 26 are acceptable transient analyses computer codes for the design of the ABWR. 26 If the applicant proposes to use analytical methods which have not been approved, these methods are evaluated by the staff for acceptability. For new generic methods the reviewer requests an evaluation by the appropriate branch. The value of parameters used in the analytical model should be suitably conservative. The following values are considered acceptable for use in the model. a. The initial power level is taken as the