MEASURES IMPLEMENTED IN OPERATED NPPs ... on...Engineering costs ca 1.5-2.0 mil. € Hours of outage saved 80 per year in average NPP extra revenue generation ca 3 mil. € per year

ÚJV Řež, a. s.

MEASURES IMPLEMENTED IN OPERATED

NPPs MODIFYING SPENT FUEL

MANAGEMENT PROCESS RESULTING IN

SHORTENING OF SCHEDULED PLANT

SHUTDOWN AND REDUCTION OF

OPERATIONAL COSTS

Petr Mach

Technical Meeting on Cost Estimation Methodologies

for Spent Fuel Management

November 5-8, 2019

IAEA Headquarters

Vienna, Austria

Contents

Nuclear power generation in Czech Republic

Overview of SNF management concept in Czech Republic

SNF storages at Czech NPPs

Measures to optimize the process aiming to the operational

cost reductions

NOTE: The content of the presentation is the property of the ÚJV Řež, a. s. Any unauthorized

use without prior consent of the author restricted.

Energy background in Czech Republic

Nuclear electricity generation 28, 9%

Carbon sources electricity generation 50-60% (by 2050 0-10%)

High public acceptance

New build project under preparation

Czech electricity mix

Source: IEA Electricity Information 2019

Productionfrom:

GWh %

Coal 44641 53.6%

Oil 92 0.1%

Gas 3710 4.5%

Biofuels 4657 5.6%

Waste 179 0.2%

Nuclear 24104 28.9%

Hydro 3202 3.8%

Solar 2131 2.6%

Wind 497 0.6%

Other 96 0.1%

Total 83309 100.0%

Operating Czech power reactors

Reactor Model Net MWe First power Licence to

Dukovany 1 VVER-440 V-213 468 1985 indefinite



Dukovany 4VVER-440 V-213 471 1987 indefinite

Temelin 1 VVER-1000 V-320 1028 2000 2020

Temelin 2 VVER-1000 V-320 1026 2003 2022

Total 3932

Selected concept of SNF storing

The dry storages were chosen for SNF storage in Czech Republic

after investment assessment.

The first dry interim SFS was built at Dukovany NPP. This storage

was completed in 12/1995 and its capacity is 600 t of Uranium (60

storage positions). It was filled up in 03/2006.

In 10/2005 the bigger dry storage was completed. Its capacity is 1340

t of Uranium (133 storage positions for casks).

The Temelin dry SFS was completed in 09/2010. Its capacity is 1370 t

of Uranium (152 storage positions).

DRY Storage concept

Dry storage is technically more simple than WET. SNF is transported to the storage in the multipurpose cask (for transport

and storage) and after that the cask is put on the storage position.

To provide assurance of leak tightness of cask seals a monitoring system

is used which monitors pressure in the space between cask lids and

temperature on the cask surface.

Cooling of the storage part is performed by natural circulation of the air and

so ventilation system is not needed.

Disadvantage of the dry storage is great number of casks which are

needed for fuel assemblies storage.

Other disadvantage is rather long time needed for cask handling in the

reactor hall. - THIS IS IN FACT BIG CHANCE FOR ECONOMIC

OPITMIZATION OF THE NPP OPERATION, WHEN OUTAGES ARE

SHORTENED

SNF Storage at the EDU Locality – Ground Floor

SNF Storage at the EDU Locality– View

SNF Storage at the Temelin NPP



SNF Storage at the Temelin NPP – Ground Floor


SNF Storage at the Temelin NPP Commercial

Aircraft Crash

Handling of the Cask in the Reactor Building

Description concerns Temelin NPP. For Dukovany it is similar.

The empty cask is driven to the reactor building transport corridor on the special wagon

for horizontal transport. After that following activities shall be done:

• cask erection on the wagon by reactor hall polar crane with hanger for cask transport,

• cask transport from wagon to the service place in the reactor hall,

• cask preparation for SNF loading,

• cask transport to the cask shaft,

• loading SNF from the spent fuel pool into the cask,

• check of the cask sealing surface,

• put the primary lid sealing on the sealing surface,

• put the primary lid on he cask,

Handling of the cask in the Reactor Building

• lift the cask to the reactor hall floor level and the cask decontamination,

• transport the cask to the service place,

• definitive fastening of the primary lid,

• preliminary tightness test of the primary lid,

• cask drainage, dry-up and He filling,

• final tightness test of the primary lid,

• put the secondary lid sealing on the sealing surface,

• put and fasten the secondary lid on he cask,

• preliminary drying of space between lids,

• preliminary tightness test of the secondary lid,

• cask contamination measurement and the cask final decontamination,

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Handling of the cask in the Reactor Building

• transport of the cask to the wagon in the transport corridor,

• transport of the cask to the SNF storage.

• Development of the concept to shorten the planned outages durations by

moving actions above elsewhere in the NPP.

• Feasibilities prepared and more detailed concepts being analysed now

Handling of the Cask in the Reactor Building

Cask Shaft in the Reactor Hall

Handling of the cask in the Reactor Building:

Service Platform in the Reactor Hall

Handling of the cask in the Reactor Building :

Cask transport to the Reactor Hall

SNF management optimization project –

MULTIPURPOSE HALL

Handling SNF Casks in Reactor building means lot of time to handle

all the actions during the outages

Aim of the project is to move these actions to another place

And to minimize the time for the transport of related service

equipment from the SNF storage building (and other places) and

back, which greatly increases outages time

Such place was not available at the Temelin NPP

Necessity to construct new building

Building is to be connected directly to the reactor hall

Significant decreasing time effect on NPP outages duration


MULTIPURPOSE HALL

Main functions of the multipurpose hall:

Handling the casks with SNF

Casks storage

Cask testing and even during NPP operation

Related service equipment storage (equipment is stored in other

places in NPP and its movement takes also some time)

Eventual cask and related equipment decontamination

Permanent casks storage

Parking of casks handling vehicles


MULTIPURPOSE HALL

Basic breakdown structure

▪ Bridge crane 140/20 tons

▪ Service room

▪ Cask drop damper

▪ Electrical systems

▪ HVAC

▪ Rail connection

▪ Hermetic measures (airlocks, leak-tightness)

▪ Special sewage connection

Connected to the reactor building

Dimensions 50m x 27 m x height 27m

Main entrance for staff from the reactor building

Main hall and other service rooms


MULTIPURPOSE HALL

24


MULTIPURPOSE HALL

25


MULTIPURPOSE HALL


MULTIPURPOSE HALL


MULTIPURPOSE HALL

ECONOMIC PARAMETERS

Construction phase 3 years

CAPEX of multipurpose hall ca 18 mil €

Engineering costs ca 1.5-2.0 mil. €

Hours of outage saved 80 per year in average

NPP extra revenue generation ca 3 mil. € per year

Economic return calculated 6-8 years

(depends on electricity market price)

NPP Temelín has 20-40 years of operation

Possible extra revenue generation 45-90 mil € (20-40 years)

….based on NPP lifetime

HOWEVER PROJECT HAS NOT BEEN STARTED YET - NOW ON HOLD

EXCEPT SOME ENGINEERING EFFORT

(Feasibilities, permit documents, licensing)

Design parameters would have to be changed

SNF management optimization project – storage

and service hall near Auxiliary building

Priority was finally given to another project – Hall near the Auxiliary

building – mainly due to the regulatory requirements and time

constraints

Reasons:

It was regulator’s requirement with near deadline to empty the SNF storage from

related service equipment used in the reactor hall

This measure was much more easy to execute than Multipurpose hall in time

available

There is a new Casks supplier / there are higher space requirements for service

equipment (new and old equipment shall be kept at the same time)

Benefits

To store the equipment from the SNF storage and other locations at one place

To provide area for some limited service actions with casks even during NPP

normal operation in this hall – time benefits during the shutdown

Impact on shutdown duration is much lower than in case of Multipurpose hall



Basic breakdown structure

▪ Service area 5 x 5 m

▪ Cask drop damper

▪ Electrical systems

▪ HVAC

▪ Special sewage connection

▪ Rail connection

Connected to the Auxiliary building

Dimensions 61m x 24 m x height 16m

Main entrance for staff from the auxiliary building

Main hall and other service rooms



Existing state Planned state



ECONOMIC PARAMETERS

Construction phase 2 years

CAPEX of multipurpose hall ca 5 mil €

Engineering costs ca 0.5 mil. €

▪ Project does not provide obvious economic return like the Multipurpose hall

since the reasons were more less regulatory and the operations performed in

the reactor hall with SNF and casks can’t be moved here in such extent

▪ Taking into account the change of casks (new supplier) there are different

conditions and it is not easy to compare new status and old

▪ However the concentration of SNF service equipment at one place even with

limited service possibilities during the NPP operation generate benefits for

NPP for sure - it saves several hours of each shutdown by eased

transportation

▪ The exact numbers not yet available - engineering phase is still ongoing



Hypotetic cost save projections (just estimates):

OPEX save/revenue generation ca 0,2-0,3 mil. € per year

for several hours saved

NPP Temelín has 20-40 years of operation

Possible extra revenue generation 4.0-8.0 mil. €

during total NPP lifetime

It could easily pays itself as well in time. Numbers above may be considered as

conservative.

When combined with Multipurpose hall (of different proportions than original) in

future the benefits of both measures would further increase

Conclusions

Dry storage represents rather long time needed for cask

handling in the reactor hall.

This is in fact big chance for economic optimization of the

NPP operation, when outages are shortened as a result of

moving the actions related to the SNF out of the reactor

building in maximal extent

Current design may be slightly modified to allow these

actions

When decisions to apply dry storage concept in a country is

combined with the new build project, such optimizations

should be solved in early phases to get maximal benefits

Based on the extent of modifications the outages may be

shortened (proven in Czech NPP case) and measures

generates profits in long term view – even each hour of

shortened shutdowns plays role in big scale of time

Thank you for your attention

Petr Mach

[email protected]

Phone: +420 602 743 163

Czech Republic

www.ujv.cz

mailto:[email protected]

Documents

MEASURES IMPLEMENTED IN OPERATED NPPs ... on...Engineering costs ca 1.5-2.0 mil. € Hours of outage saved 80 per year in average NPP extra revenue generation ca 3 mil. € per year