Document: NUREG-0800
Document ID: b694ca5b-4dcc-4098-be04-431e0137a936
Document Type: srp
Title: - 15.5.2
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070820081.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.5.1
CFR Part: 
CFR Title: 

Content:
essurize to levels exceeding the shutoff head of the ECCS pumps, and therefore would not be expected to violate the RCS pressure safety limits. Similarly, without power generation (i.e., after reactor trip) the main steam system would not be likely to pressurize beyond the steam line safety valve setpoint levels. 15.5.1-15.5.2-6 Revision 2 - March 2007 Meeting this criterion provides reasonable assurance that AOOs will not result in damage to the reactor coolant pressure boundary and subsequent fission product release. 4. Compliance with GDC 26 requires cite regulation verbation. The requirements of GDC 26 apply to this section since the appropriate mitigation for an AOO is a reactor trip (and in this case, manual action to end the mass addition to the RCS). Once shut down, the reactor should remain in a shutdown condition. Meeting this criterion provides reasonable assurance that anticipated operational occurrences will not result in fuel damage and subsequent fission product release. 5. By meeting the ANS design requirement that states, “by itself, a Condition II incident cannot generate a more serious incident of the Condition III or IV type without other incidents occurring independently,” or by satisfying the corresponding criterion of SRP Section 15.0 for AOOs (i.e., an AOO cannot generate a postulated accident without other incidents occurring independently). Such compliance limits the probability of initiating any of the more safety significant events at a relatively high frequency (i.e., one or more incidents prevent the event from developing into a more serious event occurring during the lifetime of the plant). The mass addition events, the inadvertent operation of ECCS (SRP Section 15.5.1), and the CVCS malfunction that increases reactor coolant inventory and (SRP Section 15.5.2), are more likely to challenge this criterion than other AOOs. The inadvertent operation of ECCS is a concern only in plants that are equipped with ECCS pumps (or charging