Document: NUREG-0800
Document ID: f4b8f0c1-9a14-46be-88c9-a6cb74d64dff
Document Type: srp
Title: Rev. 4 — June 1997
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0525/ML052500499.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7
CFR Part: 
CFR Title: 

Content:
. When only two channels of readout are provided, the applicant/licensee should state the basis used to ensure that an operator will not take incorrect action when the two channel readouts differ. The applicant/licensee should state the method to be used for checking the operational availability of non-indicating sensors. BTP HICB-17 discusses issues that should be considered in sensor check and surveillance test provisions for digital computer I&C systems. 28. Sections 6.6 and 7.4 — Operating Bypasses The requirement for automatic removal of operational bypasses means that the reactor operator shall have no role in such removal. The operator may take action to prevent the unnecessary initiation of a protective action. 29. Sections 6.7 and 7.5 — Maintenance Bypass The review of bypass and removal from operations should be coordinated with TSB to confirm that the provisions for this bypass are consistent with the required actions of the proposed plant technical specifications. 30. Section 6.8 — Setpoints The applicant/licensee's analysis should confirm that an adequate margin exists between operating limits and setpoints, such that there is a low probability for inadvertent actuation of the system. The applicant/licensee's analysis should confirm that an adequate margin exists between setpoints and safety limits, such that the system initiates protective actions before safety limits are exceeded. Draft Reg. Guide DG-1045 (proposed revision 3 to Reg. Guide 1.105, "Instrument Setpoints for Safety Systems") and BTP HICB-12 provide guidance on the establishment of safety system setpoints. Where it is necessary to provide multiple setpoints as discussed in Section 6.8.2, the Staff interpretation of "positive means" is that automatic action is provided to ensure that the more restrictive setpoint is used when required. BTP HICB-3 provides additional guidance on multiple setpoints used to allow operation with reactor coolant pumps out of service. 31. Section 8 —