Document: NUREG-0800
Document ID: ecb92ac6-97df-4e4b-a20a-81638c2d573b
Document Type: srp
Title: - 15.3.4
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350157.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.3.3
CFR Part: 
CFR Title: 

Content:
settings included in the proposed technical specifications. The applicants' analyses of the rotor seizure and shaft break events are reviewed by RSB regarding the occurrences leading to the initiating event. The sequence of events, from initiation until a stabilized condition is reached, is reviewed to ascertain: 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 and time at which operator actions are required. 6. That appropriate margin for malfunctions, such as stuck rods (see I1.3.b), are accounted for. If the SAR states that one of the accidents is not as limiting as the other, the reviewer evaluates the justification presented by the applicant. The 15.3.3-4 Rev. 2 - July 1981 applicant is to present a quantitative analysis in the SAR of the accident that is determined to be more limiting. For the accident that is found more limiting, the reviewer confirms that the effects of the accident are deter- mined for each mode of operation (e.g., one-, two-, three-, or four-loop) allowed by the technical specifications. Either a separate analysis should be presented or each mode of operation or the effects of each mode should be referenced to the limiting case. For the more limiting accident, the RSB reviewer, with the aid of the ICSB reviewer, reviews the timing of the initiation of those protection, engineered safety, and other systems needed to limit the consequences of'the accident to acceptable levels. The RSB reviewer compares the predicted variation of system parameters with various trip and system initiation-setpoints. The ICSB review of Chapter 7 of the SAR confirms that the instrumentation and control systems design is consistent with the requirements for safety systems