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FeaturesNew Filters RecoverMegawatts at PickeringZebra mussels, a small molluskmeasuring about one and onehalf inches (3.81 centimeters) longby .75 inches (1.9 centimeters) widein their adult form, infested thecondenser cooling water intakes at theOntario Power Generation’s four-unitPickering B nuclear plant in Canada.They were robbing it of an averageof 5-15 MW per unit and a total of8,000 man hours in yearly maintenance.Ontario Power Generation (OPG)teamed up with Framatome ANPand Taprogge America Corporation tofashion and install in-line debrisfilters that have reduced maintenanceexpenses and returned generationcapacity to the plant.The extraordinarily prolific andpersistent zebra mussel – drawing itsname from stripes on its shell – cameto the Great Lakes in the ballast ofcommercial ships from abroad in the1980s. Today, very heavy concentrationsof the mussel are noted throughoutthe Great Lakes states and in theMississippi River basin, with the molluskpushing its invasion into the St.Lawrence waterway, Lake Champlain,and the Tennessee River Valley.Zebra mussels attach to any solidsurface. They have invaded watersupply pipes of hydroelectric, nuclearand fossil power plants, public watersupply plants, and industrial facilities.The mussels colonize pipes and constrictflow reducing the intake in heatexchangers, condensers, fire fightingequipment, air conditioning, andcooling systems. The diametersof pipes have been reduced by up totwo-thirds at water treatment facilities,according to a US GeologicalSurvey report.The economic impact of the invadingmollusks is felt most heavily in the8Masses of zebra musselsseverely reduce water flow inthe condenser.power generation industry, with anaverage expenditure of $786,670 perplant recorded in a landmark 1995economic impact study.The Pickering B facility uses LakeOntario water in its condenser coolingwater (CCW) system. Mussel larvaeare small enough to pass throughprimary CCW intake screening andattach themselves to intake canalsurfaces and form colonies. As theymature, the mussels and their shellsenter condenser water inlet boxes andbecome lodged in condenser tubesheets and within condenser tubes.Flow of water through the condenseris reduced, degrading condenser andcondenser tube cleaning systemperformance, and resulting in reducedgenerating capability, lost electricgeneration revenues, and increasedmaintenance costs to manually removethe mussels.While acting as “design agent”,Framatome ANP supported the Pickeringselection of a Taprogge AmericaCorporation PR-BW800 debris filterdesign for adaptation and installation inthe six 72-inch (1.8 meters)-diameterinlets of each of the four Pickering Bunits during scheduled outages over athree-year period ending in 2003. Thedebris filter mechanism was customengineered by Taprogge to fit withinthe flange-to-flange space of anexisting 72-inch (1.8 meters) isolationvalve that was relocated, minimizingretrofitting requirements.Wayne Allen, Project Leader atPickering B, reports that the newequipment is “performing as expected.”Allen further states: “The filtersautomatically remove the mussels andother debris and, with the operationof the condenser tube cleaning system,has restored generation output andreduced maintenance expenditures,with the net result of increasedrevenue for OPG.” ■Not only are these pesky mussels a widespread problem inNorth America, they can be found in Europe and other parts ofthe world.Source: US Geological Society
Strategic Planning FacilitatesI&C ModernizationOmaha Public Power District’s(OPPD) Ft. Calhoun NuclearStation in the US employed FramatomeANP’s instrumentation and control(I&C) plant engineering team toassist in developing an integrated I&Cstrategic plan that supports long-rangestation operation and financial goals.The project provides a technicalapproach supported by financialjustification that improves reliability,supports life-cycle cost reductioninitiatives, and looks at ways to provideregular updates.Like many US plants, the Ft. Calhounplant has upgraded plant equipmentand systems on an ongoing basissince going on-line in 1973. Since theFt. Calhoun Station has applied forlicense renewal to extend its operationsto 2033, and in view of substantialadvances in technology in recentyears, OPPD deemed it necessary tosystematically upgrade I&C and datatechnology systems as well.The Framatome ANP strategic planningcapabilities are designed to developa long-term plan for these upgrades.By allowing strategic assessment tasksto be completed in parallel with datagathering and functional requirements,plan development duration can beoptimized. The primary tasks are:• Assessment of the current conditionof the plant’s I&C systems• Development of a plan to addressfunctionality within the constraintsof current budget estimates• Development of an I&Carchitectural plan to supportimplementation of the planThe objectives included assessing thecondition of I&C based plant systemsto determine current health, expectedoperations and maintenance (O&M)cost trends, replacement versusmaintain-as-is options, and prioritizationfor replacement (if applicable). Thisobjective was met with FramatomeANP’s first report, a Plant I&C SystemLife Cycle Condition Report. The majorsystem functions and characteristicswere captured in a functional requirementsdatabase. This was developedfrom data gathered during site visits,including system documentationreviews, system work history reviews,and interviews with plant managementand selected systems engineeringand operations personnel.Next, Framatome ANP developed asound and defensible financial model ofmajor I&C system changes to maintainor exceed station goals through theend of plant life. The financial analysiswas based on a recommended genericI&C architecture concept for theFt. Calhoun Station. The technicalattributes of recommended plant changesfeature the application of commonplatform elements and a genericintegrated system. The financialattributes of recommended plant changeswere captured in project estimateworksheets, a resource-loaded level Iintegrated plant change schedule, anda cost benefit analysis (CBA). TheCBA used the Plant I&C System LifeCycle Condition Report as the baselinefor expected benefits in terms ofcredible O&M cost reductions. Thisfinancial model reflects the results fromthe generic architectural concept, andwill optimize the scope, schedule andbudget for the plant. This was outlinedin Framatome ANP’s final report, aplant-wide I&C modernization plan.The development of the integratedstrategic plan for the Ft. CalhounStation spanned about nine months.Key to this project was the involvement%13010070Estimated Cost IncreasesWithout ModernizationEstimated Cost ReductionsAfter ModernizationPersonnelCost%30010050Spare PartsCost%110100Ten Year Projectionof the Ft. Calhoun management and aclose working relationship with thestation engineers. This plan will enableFt. Calhoun to implement its I&Csystem upgrades in a systematic andlogical manner while carefullycontrolling the total costs. ■Benefits of I&CStrategic Planning:45• Creating reliable and costeffectiveI&C solutionswithin an asset managementframework• Developing a vision for acommon platform approachto increase performanceand decrease costs• By applying lessons learned,global modernizationexperience and technology,operational risks can bereduced, and plant life canbe extendedServiceCostAdvanced Nuclear Power N O 9 November 2003 9
Page 1 and 2: Advanced Nuclear PowerT H E M A G A
Page 3 and 4: Perspective10Nuclear Services: Quic
Page 5 and 6: Source: Nuclear Energy Institute, U
Page 7: “I believe that every nation invo
Page 11 and 12: Cracking: A New ChallengeBecause Fr
Page 13 and 14: with the NRC and plant personnel to
Page 15 and 16: Innovative Radiological MonitoringN
Page 17 and 18: Framatome ANP Strengthensits Positi
Page 19 and 20: overview of conditions throughout t
Page 21 and 22: Major Modifications Plannedfor Daya
Page 23 and 24: New US Service Center Will Facilita

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