Bo Wook Rhee

Jin Ho Song

Malcolm Griffiths

Masanori Naitoh

Wei Shen

YongMann Song

Science and Technology of Nuclear Installations

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Advanced PHWR Safety Technology: PHWR Challenging Issues for Safe Operation and Long-Term Sustainability

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EditorialAdvanced PHWR Safety Technology: PHWR Challenging Issuesfor Safe Operation and Long-Term SustainabilityJin Ho Song,1 Wei Shen,2 Malcolm Griffiths,3 Bo Wook Rhee,1YongMann Song,1 and Masanori Naitoh41Korea Atomic Energy Research Institute (KAERI), Daejeon 305-353, Republic of Korea2Canadian Nuclear Safety Commission (CNSC), Ottawa, ON, Canada K1P 5S93Canadian Nuclear Laboratories (CNL), Chalk River, ON, Canada K0J 1J04The Institute of Applied Energy (IAE), Tokyo 105-0003, JapanCorrespondence should be addressed to Jin Ho Song; dosa@kaeri.re.krReceived 10 March 2015; Accepted 10 March 2015Copyright © 2016 Jin Ho Song et al. This is an open access article distributed under the Creative Commons Attribution License,which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Pressurized heavy water reactor (PHWR) has been operatedworldwide as one of the most efficient nuclear reactorsowing to its superior neutron efficiency and flexibility toconsider broad range of alternative fuel cycles. With theefforts for the life extension of the old reactors as well asthe post-Fukushima safety enhancement, development ofadvanced PHWR safety technologies draws attention acrossthe world.This issue on advanced PHWR safety technologiescompiles 12 papers dealing with subjects such as moderatorexperiment and severe accident for PHWR, aging and plantlife management, continued operation for PHWR, reactorphysics and fuel performance technology for PHWR, andcurrent PHWR safety R&D status in Canada.For moderator experiment, the research on the CANDU-6 moderator circulation and related experiments includingthe scaling study, flow and temperature measurement tech-niques, and a CFD analysis are discussed.For severe accident, the potential hazard of MCCI(molten corium-concrete interaction) with the uncertaintiesowing to the possibility of a calandria vault floor melt-through is discussed. Also, based on the Fukushima expe-rience, new safeguards have been proposed for PHWRs.The Fukushima accident is reviewed in terms of protec-tion, electric power, and cooling. Recommendations includeincreasing the seismic rating of certain systems in addition toconstructing external barriers for floods.The bunker conceptenhances safety through electrical redundancy and diversity.The addition of an elevated external coolant tank increasesthe cooling duration time.In the area of plant aging, mathematical fundamentals todeal with the pressure tube creep problem are formulated.For reactor physics, as an alternative way to generate thetwo-group constants necessary for the CANDU-PHWR coreanalysis, utilizing B1-theory-augmented Monte-Carlo few-group-constant-generation method is proposed and success-fully applied to CANDU-6 core analysis.For fuel performance technology, CHF enhancement ofadvanced 37-element fuel bundles is discussed, in whichtwo approaches to enlarge the flow areas of the peripheralsubchannels of a center element are considered to investigatethe impact of the flow area changes of the center subchannelson the CHF enhancement.For the PHWR safety R&D status, an overview of theCANDU safety R&D activities at CANDU Owners Group(COG), Atomic Energy of Canada Limited (AECL), CanduEnergy, Canadian Nuclear Safety Commission (CNSC), andCanadian Universities including SCWR activities, R&D foraging reactors, and regulators oversight strategy against agingare discussed.By compiling these papers, we hope to have a preciouschance to share the results of R&Defforts for the developmentof advanced PHWR technologies as well as to enrich ourHindawi Publishing CorporationScience and Technology of Nuclear InstallationsVolume 2016, Article ID 2689861, 2 pageshttp://dx.doi.org/10.1155/2016/26898612 Science and Technology of Nuclear Installationsreaders and researchers with respect to these emergingCANDU safety issues in the aftermath of the accidents at theFukushima Daiichi nuclear power plant.Jin Ho SongWei ShenMalcolm GriffithsBo Wook RheeYongMann SongMasanori NaitohTribologyAdvances inHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014International Journal ofAerospaceEngineeringHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014FuelsJournal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Journal ofPetroleum EngineeringHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Industrial EngineeringJournal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Power ElectronicsHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Advances inCombustionJournal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Journal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Renewable EnergySubmit your manuscripts athttp://www.hindawi.comHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014StructuresJournal of International Journal of RotatingMachineryHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014EnergyJournal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Hindawi Publishing Corporation http://www.hindawi.com Journal ofEngineeringVolume 2014Hindawi Publishing Corporation http://www.hindawi.com Volume 2014 International Journal ofPhotoenergyHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Nuclear InstallationsScience and Technology ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Solar EnergyJournal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Wind EnergyJournal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014Nuclear EnergyInternational Journal ofHindawi Publishing Corporationhttp://www.hindawi.com Volume 2014High Energy PhysicsAdvances inThe Scientific World JournalHindawi Publishing Corporation http://www.hindawi.com Volume 2014

Advanced PHWR Safety Technology: PHWR Challenging Issues for Safe Operation and Long-Term Sustainability

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