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:
ection because the reviewer evaluates the consequences of events specified in Regulatory Guide 1.70. Such events could result in a decrease in heat removal by the secondary system, potentially leading to changes in reactivity within the core that could cause the thermal design criteria for the fuel cladding to be exceeded. GDC 26 requires that the thermal margin be sufficient to accommodate these conditions. Where applicable, the reviewer examines these margins to ensure that the thermal criteria are being satisfied. Meeting the requirements of GDC 26 provides assurance that specified acceptable fuel design limits are not exceeded, ensuring an appropriate margin for malfunctions of the reactivity control system.37 III. REVIEW PROCEDURES The procedures below are used during both the construction permit (CP), and operating license (OL), and combined license (COL) reviews. During the CP review the values of system 38 parameters and setpoints used in the analysis will be preliminary in nature and subject to change. At the OL or COL review stage, final values should be used in the analysis, and the reviewer 39 should compare these to the limiting safety system settings included in the proposed technical specifications. The description of these transients presented by the applicant in the SAR is reviewed by RSBSRXB 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 extent to which credit is taken for the functioning of normally operating plant systems.40 4. The extent to which 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,