Design considerations for a total NSSS control digital upgrade
- Westinghouse Electric Corp., Pittsburgh, PA (United States)
Asociacion Nuclear ASCO (ANA) is currently in the design stage of several digital control system upgrades. This paper will focus on the design considerations for the replacement of the analog NSSS Control Systems. This project will replace all of the control functions (that are spread out in four cabinets) from the Westinghouse 7300-series analog control system to the field-proven Westinghouse Distributed Processing Family (WDPF) system. This project will also incorporate a functional improvement to the existing feedwater control system through the incorporation of the Westinghouse Advanced Digital Feedwater Control System (ADFCS). The primary objectives of this control system modification are to (1) provide fully automatic S/G level control from 1 to 100% power via the state-of-the-art ADFCS design, (2) eliminate the Low Feedwater Flow Trip (Low Steam Generator Narrow Range Level coincident with Steam/Feedwater Flow Mismatch) Function from the Reactor Protection System (RPS) though the use of the previously licensed Westinghouse Median Signal Selector (MSS), (3) increase the reliability and fault-tolerance of the NSSS Control System through the use of signal validation, functional separation, and hardware redundancy, and (4) minimize (or possibly eliminate) in-field tuning by performing extensive validation testing of the ADFCS through Hardware-in-Loop (HWIL) Testing (which includes closed-loop control system testing with WDPF hardware integrated with an ASO-specific Engineering Simulator), and rigorous Factory Acceptance Testing (FAT).
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States)
- OSTI ID:
- 62552
- Report Number(s):
- EPRI-TR-104913; CONF-9408170-; TRN: 95:003993-0012
- Resource Relation:
- Conference: Distributed digital systems workshop on plant process computer and networks, Charlotte, NC (United States), 16-18 Aug 1994; Other Information: PBD: Mar 1995; Related Information: Is Part Of Proceedings: Distributed digital systems, plant process computers, and networks; PB: 446 p.
- Country of Publication:
- United States
- Language:
- English
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