Document: NUREG-0800
Document ID: 61cd570c-c350-4eca-9e34-664154e4a611
Document Type: srp
Title: - 15.4.5-7
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550007.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.4
CFR Part: 
CFR Title: 

Content:
Revision 2 - March 2007 the effects of postulated reactivity accidents can neither (a) result in damage to the reactor coolant pressure boundary greater than limited local yielding, nor (b) sufficiently disturb the core, its support structures or other reactor pressure vessel internals to impair significantly the capability to cool the core. These postulated reactivity accidents shall include consideration of rod ejection (unless prevented by positive means), rod dropout, steam line rupture, changes in reactor temperature and pressure, and cold water addition. In addition, the introduction of hot water into the core of a PWR with a positive moderator temperature coefficient should be considered. GDC 28 is applicable to this section because the reviewer evaluates the consequences of the events associated with startup of an inactive loop or a recirculation loop at an incorrect temperature and with a flow controller malfunction causing an increase in BWR core flow rate. This section, SRP Sections 4.2 through 4.4, and 7.2 through 7.5, and Regulatory Guides 1.53 and 1.105, provide guidance for ensuring that the reactor coolant system and associated auxiliary, control and protection systems are designed with appropriate margin to ensure that the reactor coolant pressure boundary will not be breached. Meeting the requirements of GDC 28 provides assurance that the reactor coolant pressure boundary will not be breached during any condition of normal operation, including the effects of AOOs. III. REVIEW PROCEDURES The reviewer will select and emphasize material from the procedures described below, as may be appropriate for a particular case. For each area of review specified in subsection I of this SRP section, the review procedure is identified below. These review procedures are based on the identified SRP acceptance criteria. For deviations from these specific acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives to the