Document: NUREG-0800
Document ID: fe8ec6c2-e960-404c-854f-55c77bde1672
Document Type: srp
Title: NUREG-0800
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2400/ML24005A077.pdf
Revision Date: 2024-05
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
ys and manual controls provided to meet Point 4 are not vulnerable to the same CCF as the proposed DI&C system. For example, the point at which the credited manual controls are connected to the safety equipment should be downstream of the equipment that could be adversely affected by a CCF. BTP 7-19-35 Revision 9 — May 2024 Point 4 specifies that if the independent and diverse MCR displays and manual controls provided to meet Point 4 are not vulnerable to the same CCF as the proposed DI&C system, then the applicant may credit them as diverse means under Point 3 to address the loss of a safety function due to a CCF (see section B.3.2.2). In most cases, when displays and manual controls are credited as the diverse means for Point 3, they may also be credited for Point 4, provided they meet the acceptance criteria described below or the application includes appropriate justification. Acceptance Criteria If the following acceptance criteria are met, the reviewer should conclude that the displays and manual controls meet Point 4: a. The proposed manual actions credited to accomplish safety functions that would otherwise have been accomplished by automatic DI&C systems are both feasible and reliable, as demonstrated through an HFE process, such as the one described in SRP Chapter 18, Appendix 18-A. b. The application identifies the minimum inventory of displays and controls in the MCR, and this minimum inventory allows the operator to effectively actuate the critical safety functions (e.g., reactivity, core heat removal, reactor coolant inventory, containment isolation, and containment integrity) and to monitor and control the parameters supporting them. c. The proposed manual operator actions are prescribed by licensee-approved plant procedures, and operators are subject to appropriate training. d. The manual controls for critical safety functions are at the system or division level and are located within the MCR. For plants licensed to allow one division to be