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:
"moderate frequency" is used in this SRP section in the same sense as in the 1 definitions of design and plant process conditions in References 9 and 10. 15.2.7-5 DRAFT Rev. 2 - April 1996 anticipated operational occurrences. This is accomplished by assuring that appropriate margin for malfunctions, such as stuck rods, are accounted for. E. TMI Action Plan item II.K.2.19, II.E.1.1, II.E.1.2, and II.K.2.1 of NUREG-0718 and 21 -0737and 10 CFR 50.34(f)(1)(ii) and 10 CFR 50.34(f)(2)(xii) as they relate to the 22 performance requirements of the auxiliary feedwater system for the loss of normal feedwater flow event. 1. The basic objective in the review of the loss of normal feedwater transient is to confirm that one of the following criteria are met: a. The consequences of the transient are less severe than the consequences of another transient that results in a decrease of heat removal by the secondary system, and has the same anticipated frequency classification. b. The plant responds to the loss of feedwater transient in such a way that the criteria regarding fuel damage and system pressure are met. 2. Specific criteria necessary to meet the relevant requirements of GDC 10, 15, 17, and 26 23 for events of moderate frequency are as follows: 1 a. Pressure in the reactor coolant and main steam systems should be maintained below 110% of the design values (Ref. 1). b. Fuel cladding integrity shall be maintained by ensuring that the minimum DNBR remains above the 95/95 DNBR limit for PWRs and the CPR remains above the MCPR safety limit for BWRs based on acceptable correlations (see SRP Section 4.4). c. An incident of moderate frequency should not generate a more serious plant condition without other faults occurring independently. d. An incident of moderate frequency in 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