Document: NUREG-0800
Document ID: 621763b9-bd48-4ded-8c42-b942a23a06d4
Document Type: srp
Title: – 15.2.5
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070680.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.2.1
CFR Part: 
CFR Title: 

Content:
ich the operation of engineered safety systems that is required.41 DRAFT Rev. 2 - April 1996 15.2.1-8 5. The extent to which operator actions are required. 6. That appropriate margin for malfunctions, such as stuck rods (see II.3.b), is accounted for. If the SAR states that any one of these transients is not as limiting as some other similar transient, the reviewer evaluates the justification presented by the applicant. The applicant is to present a quantitative analysis in the SAR of the reduction-of-heat-removal transient that is determined to be most limiting. For this transient, the RSBSRXB reviewer, in consultation with the ICSBHICB reviewer, reviews the timing of the initiation of those protection, engineered safety, and other systems needed to adequately limit the consequences of the transient to an acceptable level. The RSBSRXB reviewer compares the predicted variation of system parameters with various trip and system initiation setpoints. The ICSBHICB reviewer provides consultation on automatic initiation, actuation delays, possible bypass modes, interlocks, and the feasibility of manual operation if the SAR states that operator action is needed or expected. To the extent deemed necessary, the RSBSRXB reviewer evaluates the effect of single active failures of systems and components which may affect the course of the transient. For new applications, loss of offsite power (LOOP) should not be considered a single failure; each of the reduction-of-heat-removal transients should be analyzed with and without a LOOP in combination with a single active failure. (This position is based upon interpretation of GDC 17, as documented in the Final Safety Evaluation Report for the ABB-CE System 80+ design certification.) This phase of the review uses the system review procedures described in the 42 standard review plans for Chapters 5, 6, 7, and 8 of the SAR. The mathematical models used by the applicant to evaluate core performance and to predict system pressure in the