Availability of the Emergency Safety Electrical System of a Konvoi Nuclear Power Plant Considering Mobile Arrangements of Diesel Generators After Fukushima

Abstract

This work investigates the availability of the power system of a Konvoi nuclear power plant against a station blackout scenario considering the acquisition of emergency mobile diesel generators (DG_Ms) as an additional alternative for power supply to the plant, which is one of the post-Fukushima initiatives planned to improve safety. The study was carried out by modeling the systems involved using Markov chains. The simulation carried out through the MATLAB program showed a considerable gain in the availability of the emergency electric system when the group of DG_Ms is added to the set.

Keywords:

• Fukushima
• diesel generators
• station blackout
• Markov chains
• Konvoi-design reactors

Acronyms

APR 1400:	=	Advanced Pressurized Water Reactor [1400 rated power MW(electric)]
BWR:	=	boiling water reactor
CNAAA:	=	Central Nuclear Almirante Álvaro Alberto
DG:	=	diesel generator
DGM:	=	mobile diesel generator
DGP:	=	principal diesel generator
DGR:	=	reserve diesel generator
EDG:	=	emergency diesel generator
D1:	=	Emergency Diesel System 1
D2:	=	Emergency Diesel System 2
EPSS:	=	emergency power supply system
EPSS 1:	=	Emergency Power Supply System 1
EPSS 2:	=	Emergency Power Supply System 2
FSAR:	=	Final Safety Analysis Report
GPWR:	=	generic pressurized water reactor
IAEA:	=	International Atomic Energy Agency
NNEC:	=	National Nuclear Energy Commission
NRC:	=	U.S. Nuclear Regulatory Commission
PHWR:	=	pressurized heavy water reactor
PV:	=	photovoltaic
PWR:	=	pressurized water reactor
SBO:	=	station blackout
SDS:	=	shutdown system
SDS-2:	=	Shutdown System 2
SG:	=	steam generator
SIS:	=	safety instrumented system
STM:	=	state transition matrix
WTG:	=	wind-turbine generator

Acknowledgments

We would like to thank our colleague and friend Carlos Canedo (deceased) for his invaluable help concerning details for solving the equations of the Markov model. We dedicate this work to his memory.

Disclosure Statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

Two of the authors (PFFM and CMFL) would like to acknowledge their support from the Brazilian National Council for Scientific and Technological Development (CNPq) through grants [303139/2019-6] and [308258/2019-3], respectively. The funder name, in Portuguese, is Conselho Nacional de Desenvolvimento Científico e Tecnológico, registered with the CNPJ under no. 33654.831/0001-36.