Document: NUREG-0800
Document ID: 9697248b-d015-42be-8808-2202db24977a
Document Type: srp
Title: STANDBY LIQUID CONTROL SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070680186.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.5
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for the review of reactor systems (BWR) Secondary - None I. AREAS OF REVIEW The standby liquid control system (SLCS) may be part of the emergency core cooling system (ECCS) network for a boiling water reactor (BWR). For example, the SLCS for the economic simplified BWR (ESBWR) is part of the emergency core cooling system (ECCS). In these instances, Standard Review Plan (SRP) Section 6.3 is also applicable and should be used in conjunction with SRP Section 9.3.5. BWR plants include an SLCS that provides backup capability for reactivity control independent of the control rod drive (CRD) system. The SLCS functions by injecting a boron solution into the reactor to effect shutdown. This system has the capability to control the reactivity difference between the steady-state operating condition at any time in core life and the cold shutdown condition. The review covers the SLCS design to the point at which the system connects to the reactor coolant system (RCS). The NRC staff reviews the system to determine its adequacy to perform the shutdown function in conformance with the requirements of General Design Criteria (GDC) 2, 4, 5, 26, and 27 and 10 CFR 50.62(c)(4). The specific areas of review are as follows: 1. The functional performance characteristics of SLCS components and the effects of adverse environmental occurrences, abnormal operational conditions, or accident conditions such as those resulting from a loss-of-coolant accident. 2. The system design to ensure that a malfunction or a single failure of a component will not reduce the safety-related functional performance capabilities of the system. 9.3.5-2 Revision 3 - March 2007 3. The system design with respect to its capability to detect, collect, and control system leakage and to isolate portions of the system in case of excessive leakage or component malfunctions. 4. The capability of the system to prevent precipitation of the neutron absorber in