Document: NUREG-0800
Document ID: 94ab38ac-ddfc-4ba1-ae38-bc25ffa6e976
Document Type: srp
Title: – 15.4.5
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070716.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.4
CFR Part: 
CFR Title: 

Content:
tain: 1. The extent to which normally operating plant instrumentation and controls are assumed to function. 2. The extent to which plant and reactor protection systems are required to function. 3. The credit taken for the functioning of normally operating plant systems. 4. The operation of engineered safety systems that is required. 5. The extent to which operator actions are required. 6. That appropriate margin for malfunctions, such as stuck rods (see III.3.b), is accounted for. If the SAR states that a particular core flow transientAOO is not as limiting as some other similar transientAOO, the reviewer evaluates the justification presented by the applicant. The applicant should present a quantitative analysis in the SAR of the increase in flow transientAOO that is determined to be most limiting. For this transientAOO, the RSBSRXB reviewer, with the aid of the ICSBHICB reviewer, reviews the timing of the initiation of protection, engineered 33 safety feature, and other systems needed to limit the consequences of the core flow increase transientAOO to acceptable levels. The RSBSRXB reviewer compares the predicted variation of system parameters with various trip setpoints. The ICSBHICB review of Chapter 7 of the SAR 34 confirms that the instrumentation and control system design is consistent with the requirements for safety system actions for these events. To the extent deemed necessary, the RSBSRXB reviewer evaluates the effect of single active failures of safety systems and components which may alter the course of the transientAOO. This phase of the review uses the system review procedures described in the SRP sections for Chapters 5, 6, 7, and 8 of the SAR. The reviewer considers and evaluates the possibility of a single failure that would permit the loop isolation valves to open prior to startup of a pump in an idle loop (for those plants with loop isolation valves). If this could occur, the core flow rate increase would not be limited by the rate at which the