Document: NUREG-0800
Document ID: f813a982-efc9-4295-a0ff-eb6a289f39ba
Document Type: srp
Title: BOILING WATER REACTOR STABILITY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550017.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.9
CFR Part: 
CFR Title: 

Content:
able power oscillations with the scram system available. 15.9-3 March 2007 2. GDC 12, “Suppression of Reactor Power Oscillations,” requires that oscillations be either not possible or reliably and readily detected and suppressed. 3. GDC 13, “Instrumentation and Control,” includes requirements for the hardware implementation of stability LTS. 4. GDC 20, “Protection System Functions,” requires the reactor protection system to initiate automatic action so SAFDLs are not exceeded for conditions that result in unstable power oscillations. 5. GDC 29, “Protection against Anticipated Operational Occurrences,” requires stability LTS design for an extremely high probability of accomplishing safety functions. 6. Generic Letter 94-02 concerns the installation of LTS to satisfy GDCs 10 and 12. SRP Acceptance Criteria Specific SRP acceptance criteria acceptable to meet the relevant requirements of the NRC’s regulations identified above are as follows for the review described in this SRP section. The SRP is not a substitute for the NRC’s regulations, and compliance with it is not required. However, an applicant is required to identify differences between the design features, analytical techniques, and procedural measures proposed for its facility and the SRP acceptance criteria and evaluate how the proposed alternatives to the SRP acceptance criteria provide acceptable methods of compliance with the NRC regulations. 1. To meet requirements of GDC 12 the reactor core and its systems should be designed with sufficient margin to be free of undamped oscillations and other thermal-hydraulic instabilities for all conditions of steady-state operation (including single-loop operation and extended-cycle operation with reduced feedwater temperature where these operating conditions are proposed) and for anticipated operational occurrences (AOOs). 2. If potential oscillations cannot be eliminated, design proposals should detect and suppress them reliably and readily. 3.