Document: NUREG-0800
Document ID: 002fd394-c647-4c8e-af03-c1f9a25c1e85
Document Type: srp
Title: B-10
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550087.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
Revision 5 - March 2007 4.13. Indication of Bypass (IEEE Std. 279-1971 Clause 4.13) Guidance on bypasses and inoperable status indication is provided in Regulatory Guide 1.47, "Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety System." 4.14. Access to Means for Bypassing (IEEE Std. 279-1971 Clause 4.14) Administrative control is acceptable to ensure that access to the means for bypassing is limited to qualified plant personnel and that permission of the control room operator is obtained to gain access. 4.15. Multiple Setpoints (IEEE Std. 279-1971 Clause 4.15) The staff interpretation of "positive means" is that automatic action is provided to ensure that the more restrictive setpoint is used when required. SRP BTP 7-3 provides additional guidance on multiple setpoints used to allow operation with reactor coolant pumps out of service. 4.16. Completion of a Protective Action Once it is Initiated (IEEE Std. 279-1971 Clause 4.16) The staff review of this item should include review of functional and logic diagrams to ensure that "seal-in" features are provided to enable system-level protective actions to go to completion. The seal-in feature may incorporate a time delay as appropriate for the safety function. Additionally, the seal-in feature need not function until it is confirmed that a valid protective command has been received, provided the system meets response time requirements. 4.17. Manual Initiation (IEEE Std. 279-1971 Clause 4.17) Features for manual initiation of protective action should conform with Regulatory Guide 1.62, "Manual Initiation of Protection Action." The review of manual controls should be coordinated with the organization responsible for the review of human factors to confirm that the functions controlled and the characteristics of the controls (e.g., location, range, type, and resolution) allow plant operators to take appropriate manual actions. The review of manual controls should include confirmation that the controls