Document: NUREG-0800
Document ID: a9a7e1a8-e1f6-44b0-8ded-a044be0e9e01
Document Type: srp
Title: 3
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350392.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.4.4
CFR Part: 
CFR Title: 

Content:
Rev. 1 - July 1981 b. Conservative scram characteristics are assumed, e.g., maximum time delay with the most reactive rod held out of the core for a PWR and a desi n conservatism factor of 0.8 times the calculated negative reactivity Ynser- tion rate for a BWR. c. The core burnup is selected to yield the most limiting combination of moderator temperature coefficient, void coefficient, Doppler coefficient, axial power profile, and radial power distribution. d. Mitigating systems should be assumed to be actuated in the analyses at setpoints with allowance for instrument inaccuracy in accordance with Regulatory Guide 1.105 as determined by ICSB. The reviewer shall verify that the protection system (1) initiates automatically the operation of appropriate systems, including the reactivity control systems, to assure that specified acceptable fuel design limits are not exceeded for this event, and (2) senses the plant conditions and initiates the operation of systems and components important to safety. For BWR plants where flow control is part of the reactivity control system, GDC 25, 26, and 28 must be satisfied for this event; otherwise, GDC 25, 26- and 28 are not applicable. Where applicable, GDC 25, 26, and 28 are satisfied if compliance with GDC 10 and 15 is demonstrated. III. REVIEW PROCEDURES The procedures below are used during both the construction permit (CP) and operating license (OL) reviews. During the CP review the values of system parameters and setpoints used in the analysis will be preliminary in nature and subject to change. At the OL review stage, final values should be used in the analysis, and the reviewer should compare these to the limiting safety system settings included in the proposed technical specifications. The description of the core flow increase transients presented in the SAR is reviewed by RSB regarding the occurrences leading to the initiating event. The sequence of events from initiation until a stabilized condition is reached is