Document: NUREG-0800
Document ID: 65f2433f-2c4a-4580-b173-0c6da7fa4d73
Document Type: srp
Title: Draft Revision 7 – August 2015
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159A996.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
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Content:
in the control room to implement manual initiation of the automatically initiated protective actions at the system level or division level (depending on the design) of the RTS and ESF functions. This safety-related manual means shall minimize the number of discrete operator manual manipulations and shall depend on operation of a minimum of equipment. If a D3 analysis indicates that the safety-related manual initiation would be subject to the same potential CCF affecting the automatically initiated protective action, then under Point 3 of the NRC position on D3, a diverse manual means of initiating protective action(s) would be needed, (i.e. two manual initiation means would be needed). If the safety-related system/division level manual initiation required by IEEE Std 603-1991 is sufficiently diverse, the diverse (second) manual means would not be necessary (see Section B.1.5, “Manual Initiation of Automatically Initiated Protective Actions Subject to CCF”). If credit is taken for a manual actuation method that meets both the IEEE Std 603-1991, Clauses 6.2 and 7.2 requirements and a need for a diverse manual means, then the applicant should demonstrate that the criteria are satisfied and that sufficient diversity exists. Note that if the diverse means is nonsafety, then IEEE Std 603-1991, Clause 5.6, “Independence,” directs the separation or independence of the safety systems and the diverse means (see Figure 1). (7) If the D3 assessment reveals a potential for a CCF, then the method for accomplishing the diverse means of actuating the protective safety functions can be achieved via either an automated system (see Section 3.4, “Use of BTP 7-19-14 Draft Revision 7 – August 2015 Automation in Diverse Means” below), or manual operator actions that meet HFE acceptability criteria (see Section 3.5, “Use of Manual Action as a Diverse Means of Accomplishing Safety Functions” below). (8) If the D3 assessment reveals a potential for a CCF, then the method