Document: NUREG-0800
Document ID: 16650158-402d-4897-850a-bc9e2cce7648
Document Type: srp
Title: INADVERTENT OPENING OF A PWR PRESSURIZER PRESSURE RELIEF
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070726.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.6.1
CFR Part: 
CFR Title: 

Content:
on. The term "moderate frequency" is used in this SRP section in the same sense as in the * description of design and plant process conditions in References 7 and 8. DRAFT Rev. 2 - April 1996 15.6.1-4 2. The plant responds to the pressure relief valve opening transient in such a way that the criteria regarding fuel damage and system pressure are met. The specific criteria necessary to meet the requirements of GDC General Design Criteria 10, 36 15, and 26 for incidents of moderate frequency are: * a. Pressure in the reactor coolant and main steam systems should be maintained below 110% of the design values (Ref. 5). b. Fuel cladding integrity shall be maintained by ensuring that the minimum departure from nucleate boiling ratio (DNBR) remains above the 95/95 DNBR limit for PWRs and the critical power ratio (CPR) remains above the minimum critical power ratio (MCPR)37 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 radiological dose calculations. For such accidents, fuel failures 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 GDC General Design Criteria 10, 15, and 26, the positions of Regulatory Guide 1.105 (Ref. 9), "Instrument Spans and Setpoints for Safety-Related 38 Systems," are used with regard to their impact on the plant response to the type of 39 transient