Document: NUREG-0800
Document ID: 96afb1d6-6ce9-41e4-b4ec-1fc7747bc0b2
Document Type: srp
Title: Revision 8 – January 2021
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML2033/ML20339A647.pdf
Revision Date: 2023-05
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
adversely affected by a CCF. The reviewer should confirm that the applicant does not credit the same digital platform or analog technology for point 3 (e.g., to mitigate DBEs). Point 4 specifies that the MCR displays and controls shall be independent and diverse from the digital platform or analog technology identified for points 1 and 3. If they are not vulnerable to the same CCF, the applicant may credit some or all of the displays and manual controls provided to meet point 4 as the diverse means called for under point 3, as described in Section B.3.2.2 of this BTP. 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. However, if the diverse means credited for point 3 are not located in the MCR, then they are not sufficient to meet point 4. The reviewer should determine whether controls outside the MCR are exclusively used for long-term management of these critical safety functions, after completion of system-level or division-level manual actuation from the MCR using the point 4 displays and controls. The reviewer should also determine whether controls outside the MCR are supported by suitable HFE analysis and site-specific procedures or instructions. Acceptance Criteria If the following acceptance criteria are met, the reviewer should conclude that the manual controls and supporting displays meet point 4: a. The proposed manual actions credited to accomplish safety functions that would otherwise have been accomplished by automatic safety systems are both feasible and reliable, as demonstrated through an HFE analysis and assessment process, such as the one described in SRP Chapter 18. Section B.3.2.2 of this BTP presents the acceptance criteria for manual actions. b. The application identifies the minimum inventory of displays and controls in the MCR, and this minimum inventory allows the operator to effectively monitor and control the critical safety parameters of reactivity, core