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:
to which plant and reactor protection systems are required to function. 15.5.1-15.5.2-8 Revision 2 - March 2007 3. Credit taken for the functioning of normally operating plant systems; 4. Operation of required engineered safety systems; 5. The extent to which operator actions are required; ( Note: an operator action to shut off the charging pump flow is normally required to terminate these AOOs. 6. That appropriate margin for malfunctions, such as stuck rods (see subsection II.3.b), is taken into consideration. The applicant should present a quantitative analysis in the SAR of the most limiting events that lead to an increase in reactor coolant inventory. Such an analysis should demonstrates that AOOs could not develop into more serious events. The reviewer examines the timing of the initiation of those protection and engineered safety systems, and operator actions needed to limit the consequences of the event to acceptable levels. The reviewer compares the predicted variation of system parameters with various trip and system initiation setpoints. The mathematical models used by the applicant to evaluate core performance and to predict system pressure in the reactor coolant system and main steam lines are reviewed to determine if these models have been previously reviewed and found acceptable by the staff. If not, a generic review of the models is initiated. The values of system parameters and initial core and system conditions used as input to the model are reviewed. Of particular importance are the reactivity coefficients and control rod worths used in the applicant's analysis, and the variation of moderator temperature, void, and Doppler coefficients of reactivity with core life. The justification provided by the applicant to show that the selected core burnup yields the minimum margins. The results of the applicant's analysis are reviewed in accordance with the acceptance criteria presented in subsection II regarding maximum pressure in the reactor coolant and