Document: NUREG-0800
Document ID: 11c48e6f-fbdc-40a1-8d4a-a09d5a0f49f3
Document Type: srp
Title: B-11
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1601/ML16019A091.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.1
CFR Part: 
CFR Title: 

Content:
Revision 6 – August 2016 4.12. Operating Bypass (IEEE Std 279-1971, Clause 4.12) 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. 4.13. Indication of Bypass (IEEE Std 279-1971, Clause 4.13) Guidance on bypasses and inoperable status indication is provided in RG 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, “Guidance on Protection System Trip Point Changes for Operation with Reactor Coolant Pumps Out of Service,” 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 RG 1.62, “Manual Initiation of Protection