SAFIR2018FortumAri-Pekka Kirkinen22.3.2019

Presentation Outline

Major Plant Modifications 2014-2018

PRA

Ensure Design Integrity and Nuclear Safety

Conclusions

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• Nitrogen closure valves of the emergency core coolantaccumulators renewed

• Lo1 discharge channel gate VA01S002 elevation up to+3,00 m

• 10AT01 transformer renewed• Protection against high sea level• Procedure update on the loss of instrument room cooling

(UV20/25)• TK-RY connection testing every 8 years

• Independent cooling towers• Operation procedures against high sea level• Introduction of the flow chart emergency operating

procedures for leaks in shutdown states• Service water drainage during annual outage

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Major Plant Modifications

2014 2015

2016

• AEFW feed also to steam generatorsYB15 and YB52 & battery backed-uppower to control valves

• Temporary dam in VC10 replaced bytemporary gate

• Loviisa 1 main steam safety relief valvesrenewed

• Preventive Actuation and IndicationSystem (PAIS) introduced

• 3 turbine bypass valves (RC) hydraulicoil stations replaced by water hydr.

• AEFW “blind operation” procedures• Improvement of procedures for “forced

convection”• Procedures for leaks and transients

during shutdown states• Regular training for auxiliary RHR system• Lifting reactor internal parts every 8 years

instead of 4

• Remaining 5 RC hydraulic oilstations replaced

• Accident ManagementPrioritization System (AMPS)introduced

• Opening steam generator specificauxiliary emergency feed watervalves prior to a high sea level

• Improvement in practices: filling upsea water channel before lifting uptemporary gates

20182017

• Secondary side safety improvementproject (SETU)

• Automation renewal project introduces– Reactor Trip System (RTS) and its

Automatic (ABS) and Manual (MBS)Backup Systems (MBS also includesmanual backup of ESFAS & HRFHS)

– Neutron Flux Measurement System– Reactor Power Control System– Reactor Power Limitation System

• Polar-crane modernization (Lo2)• Improvement of fuel pool cooling in

ALPO project• Last temporary dam replaced by

temporary gate

Major Plant Modifications

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European Stress Tests for Nuclear Power PlantsStatus of Activities Presented in the Finnish Action Plan, 5.7.2017

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Current situation

101 Evaluation of fragility of the spent fuel pools at high temperature and at highpressure

Implemented

102 Updating the seismic fragility analyses of- the spent fuel pools- fire fighting systems

ImplementedImplemented

103 improving preparedness for high seawater level Implemented

104 Analysis of consequences of beyond design basis low and high temperature Implemented

105 Analysis of consequences of tornados and downbursts on plant structures andsystems

Implemented

106 Implementation of an alternative ultimate heat sink Implemented

107 Securing the availability of the auxiliary emergency feed water system Implemented

108 Acquiring a container to transfer diesel fuel at site Implemented109 Enhancing the battery power sources Implemented

Note: Further ongoing changes due to reg. Req.

110 Acquiring mobile power supply and mobile pumps Not to be implemented111 Connecting the additional diesel power engine to the plant switchgears by a

dedicated cableImplemented

112 Evaluation of demineralised water reservoirs Implemented

113 Evaluation of demineralised water usage in an accident concerning all units andspent fuel pools at the site

Implemented

European Stress Tests for Nuclear Power PlantsStatus of Activities Presented in the Finnish Action Plan, 5.7.2017

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Current situation

114Enhancing the diesel fuel transfer capabilities onsite; acquiring a newdiesel fuel storage tank at site Implemented

115 Evaluation of suitability of biodiesel for the diesel engines Implemented

116Ensuring the water injection into the spent fuel pools and monitoring theconditions of the pool In progress

117Capability of dealing with multi-unit severe accidents; updating ofemergency plans and organisation Implemented

118Improving the containment decay heat removal in case of multi-unitaccidents Situation OK without modifications

119 Plans for restoring the access routes to the site Implemented

120Evaluation of suitability of emergency preparedness personnel to theirduties Implemented

121Plans for access control and radiation monitoring of the staff anddecontamination measures in extreme natural hazards Instructions are done

Probabilistic Risk Analysis (PRA)• Requirements for full-scope PRA at Levels 1 and 2 for

power operation and low-power and shut-down states– Internal events, fires, floods, seismic events, harsh weather

and other external events

• Several risk-informed PRA applications required and inuse– Plant modifications, in-service inspection program, in-

service testing, Tech Specs, preventive maintenance duringpower operation, event analysis risk follow-up, safetyclassification, staff training, development of EOPs and otherprocedures

• Several risk informed plant modifications implementedat NPP e.g.– Fire and seismic risk is reduced significantly– Better preparedness against oil spills in the Gulf of Finland

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Ensure Design Integrity and Nuclear Safety

• New process KPI for Regulatory Compliance is taken in use– Fulfillment of Nuclear Regulation measures overall status how

national and international requirement levels are met

• Compliance with national regulations and regulatory guides inhigh level for an operating nuclear power plant– YVL Compliance Rate

• Benchmark to international nuclear requirements still showsthe potential for further development actions– WANO Performance Objectives & Criterias Indicator– IAEA Osart Indicator

• Loviisa Compliance Digitalization continues with Polarion ALM

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Good reputationDemand for expertise

Fortum supportbased on strategy

Strong Competence and Good R&DCo-operation with Universities & Research

Competent personnelThe plant is operated by a motivated and skillful working communityapplying high safety culture, co-operating to achieve common goals.

Concept of plant wide co-operationFocus on excellent performance

O&M,Operations and

Maintenance

Fuel and WasteManagement

Design Integrity& Nuclear Safety

Safe, reliable andprofitable production

Ensure availability of the power plant

Loviisa operates with the lowest costs in majority of cost areas,it ranks as leading performer in fuel front and availability

ConclusionsKey success factors of the Loviisa NPP

Reference Material

/1/ Regulatory Guides on nuclear safety and security (YVL), http://www.stuk.fi/web/en/regulations/stuk-s-regulatory-guides/regulatory-guides-on-nuclear-safety-yvl-

/2/ STUK decision, 5/A42213/2015, Loviisa nuclear power plant, PSR2015, 4.2.2017

http://www.stuk.fi/documents/88234/254201/1694439-stuks-decision-concerning-the-loviisa-npp-periodic-safety-review.pdf/1a1beb6c-9ae8-cd0b-0c6e-c001e7452ac9

/3/ STUK annual report, STUK-B 205 / JULY 2016, Finnish report on nuclear safety, Finnish 7th nationalreport as referred to in Article 5 of the Convention Nuclear Safety

https://www-ns.iaea.org/downloads/ni/safety_convention/7th-review-meeting/finland-7th-rm-national-report.pdf

/4/ STUK annual report 2016, STUK-B 214 / JUNE 2017, Regulatory oversight of nuclear safety in Finland

https://www.julkari.fi/bitstream/handle/10024/134790/stuk-b214.pdf?sequence=1

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