Document: NUREG-0800
Document ID: 1df526d9-2ae0-4da2-b936-2e24b038ca8c
Document Type: srp
Title: DIVERSE INSTRUMENTATION AND CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070650035.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.8
CFR Part: 
CFR Title: 

Content:
eedwater), diversity is required from the sensors to, but not including, the final actuation device. - Sensors need not be of a diverse design or manufacturer. 7.8-8 Revision 5 - March 2007 - Existing RTS sensing lines may be used for ATWS mitigation instruments. - Sensors/transmitters and sensing lines should be selected such that adverse interactions with existing control systems are avoided. - Logic and actuation device power for the ATWS mitigation system should be from an instrument power supply independent from the power supplies for the existing RTS. Existing RTS sensor and instrument channel power supplies may be used, provided the possibility of common-cause failure is prevented. If the ATWS system is explicitly addressed as part of a D3 analysis, the analysis provides the basis for assessing the adequacy of diversity between the ATWS mitigation system and the RTS. Therefore, separate evaluation of the ATWS mitigation system against the above eight diversity criteria is unnecessary if the D3 analysis is provided. Additional major design considerations that should be emphasized in the review of manual controls and displays are: • For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the acceptance criteria. DCs have referred to the FSAR as the design control document (DCD). The reviewer should also consider the appropriateness of identified COL action items. The reviewer may identify additional COL action items; however, to ensure these COL action items are addressed during a COL application, they should be added to the DC FSAR. • For review of a COL application, the scope of the review is dependent on whether the COL applicant references a DC, an ESP or other NRC approvals (e.g., manufacturing license, site suitability report or topical report). • For