vtt centre for nuclear safety · click to edit master title style click to edit master text styles...
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VTT Centre for Nuclear SafetySuomalaisen Ydintekniikkan Päivät
Nuclear Science and Technology Symposium
Helsinki, 2 and 3 November 2016
Wade Karlsen, Research Team Leader
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23.11.2016 2
VTT nuclear energy R&D competencies
Radioactive Waste Disposal Solutions
• Characterization of radioactive waste
• Design of disposal concept (KBS-3)
• Operating waste and decommissioning
• Bedrock and groundwater characterization
• Long-term safety of materials, disposal facilities
and safety case
• Engineering barrier system component
manufacturing and quality control
• Operational safety of disposal facilities, incl. PRA
• New and alternative waste management
technologies
• Licensing support
• Low and Intermediate waste storage.
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VTT nuclear energy R&D competencies
Reactor materials testing and research
• VTT has been hosting the national hot laboratory infrastructure since it
was first constructed and equipped in the 1970’s.
• Principle use has been for handling, testing and examining RPV
materials for surveillance testing.
• Many critical plant life management issues for operating nuclear power
plants are related to materials.
• Lifetime extension, power upgrading, and construction of new plants
require investigating and solving problems related to components and
structural integrity.
• Aging degradation of structures and components
is an important aspect of power plant safety.
• Ageing management requires activities related to
the utilization, inspection, surveillance, testing,
examination, and degradation mitigation of
materials.
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Profile of new Centre for Nuclear Safety
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3-D model of facility
Office entrance
3,300 m2 office wing includes
a ground-level conference
centre
three floors of modern, flexible
office space for 150 people.
Laboratory wing and transport
yard2,360 m2 laboratory wing includes
a basement level and
two floors of laboratory space
around the main high-bay
Transport dock for trucks
room for centralised supply of
gases used (Ar 5.0, Ar 6.0, Ar/H2,
Ar/CH4, N2, CO2)
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Profile of new Centre for Nuclear Safety
Office wing is intended to serve nuclear sector
employees in:
• computerized fluid dynamics
• process modelling (APROS)
• fusion plasma computations
• severe accidents
• core-computations
• waste-management
• safety assessments
• staff working in the laboratory wing.t = 0 ms 40 ms
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Profile of new Centre for Nuclear Safety
Basement:
storage and handling of radioactive materials and waste
High-bay area:
Pilot hall and hot-cells
Laboratory space includes mechanical and microstructural characterisation of materials
radiochemistry
HR-ICP-MS
Iodine filter testing
nuclear waste
dosimetry
aerosol measurements
failure analysis
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CNS construction, 2014
Jan. 14 Jun. 14
Sept. 14 Dec. 14
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CNS construction, 2015
Jul.15Jul. 15
Jan. 15Jan. 15
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CNS completion, 2016
May16 Sep. 16
May. 16Jan. 16
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Safety features of the CNS
KATAKRI III security & safeguards requirements.
Extra-thick concrete walls of basement; blocks gamma
radiation in case of accidental source uncovering.
Basement ceiling/main floor extra thick for adequate
structural integrity for the hot cells installed on the
main floor.
Electrical supply to the laboratory facilities
assured by back-up diesel and centralized UPS.
Redundant ventilators for A-laboratory and B- & C-
laboratory.
Back-up diesel generators for ventilator ensure under-
pressures in the laboratory are maintained.
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Modern laboratory features of the CNS
Special attention to low energy consumption solutions.
Ventilation system has fully automated balancing on
room-by-room basis, including presence monitors.
Laboratory fire suppression by HiFog low-water system.
Centralized supply of laboratory gases (Ar 5.0, Ar 6.0,
Ar/H2, Ar/CH4, N2, CO2), piped to the rooms needing
them
Source bottles are stored in a dedicated gas
storage facility accessed directly from the gated
courtyard
This eliminates the need to wheel bottles into the
radiological controlled area.
Liquid nitrogen supply into radiological area via pipe.
Centralized cooling is available for connection by
individual pieces of equipment as needed.
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C-laboratory: Clean-room with ICP-MS
Clean-room space includes:
• Acid wash room (no ISO classification, HEPA filtration of supply air)– All supplies in sample preparation are acid washed clean prior to use– Ultrapure water station, two fume hoods, cabinet for acids, laminar-flow cabinet
(drying and packing of supplies for sample preparation)
• Entrance and dressing areas (ISO 6 – ISO 8)
• Weighing room (ISO 8)– two weighing tables with analytical scales– sample preparation for HR-ICP-MS, storage of standards
and samples– ultrapure laboratory water
• Instrument room (ISO 7)– HR-ICP-MS and extra space for an other apparatus– Controlled temperature and humidity (21 C, 50-60 %)
• Special room (ISO 6)– microscope, weighing table, analytical scale,
two laminar-flow cabinets and cabinet for chemicals
• Pass through boxes between the different rooms
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C-laboratory:Nuclear waste management, radiochemistry, and aeresol research
Laboratory rooms with general chemistry lab furnishing– Fume-hoods, clean water, weighing tables, scales etc.
Special laboratory rooms for
• Four glove-boxes (small over pressure)– Argon atmosphere; low contents of O2 (<0.1 ppm) and CO2
– Constant measurement of O2 in atmosphere anddissolved in water (Orbisphere instrument)
– Possibility to measure H2 (Orbisphere instrument)– Possibility to add CO2 partial pressure to one glove-box
• Bentonite and colloid research– High-speed centrifuge with several rotors (tubes from 50 mL to 1000 mL)– Laminar-flow cabinet (particle free handling)– Muffle oven (fabrication of ion-selective electrodes)
• Microwave dissolution apparatus (dropped ceiling)– Dissolution of difficultly soluble samples (metal, rock, tissue)and preparation for
HR-ICP-MS analysis
• Handling and studying of small concentrations (dropped ceiling)
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C-laboratory:Nuclear waste management, radiochemistry, and aeresol research
• Aerosol research– Migration of fission products in severe nuclear power plant accidents
• Measurement of - , - and - activities– Liquid scintillation counter
– Automated shielded measuring track for larger samples
• Electronic workshop– Serves constructing measuring devices and instruments
• Instrument service– Laboratory diswasher
• Proper storage room for chemicals– Fire safe chemical cabinets
– Freezers and refrigators
• General storage room
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Main floor B-laboratory:
Nuclear waste & radiochemistry
• α-glove-box (small underpressure) for working with α-active radionuclides– equipped with required filters (inside and outside so that no
contamination can escape the working space of the glove-box
– Argon atmosphere; low contents of O2 (<0.1 ppm) and CO2
– Constant measurement of O2 in atmosphere anddissolved in water (Orbisphere instrument)
– Possibility to measure H2 (Orbisphere instrument)
• General chemistry laboratory equipment– Fume hoods, clean lab water, scales, etc.
• Movable laminar-flow cabinet (eg. microbiology)
• Possibility to install an other α-glove-box
• Lockable storage room
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Main floor A-laboratory:Pilot area
In the high-bay, partly sectioned off.
Equipped with
• Fume hood
• Glove-box (small over pressure)
– Argon atmosphere, low contents of O2
(<0.1 ppm) and CO2
• Cabinet for chemicals
• Gamma-cell
• Calibration track
• Heavy-duty working tables
• Free space for larger experiments
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Main floor Microscopy:
Light microscopy of low-activity and contaminated specimens.
New, top-of-the line FEI Talos transmission electron microscope,
equipped with EDS and EELS.
Zeiss Cross-beam scanning electron equipped with EBSD, EDS
and WDS.
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A-class basement: Autoclave testing
• Enables mechanical testing materials in
simulated LWR conditions.
• Carried out over long time periods.
• Locally shielded manipulation of device
and specimen installation.
• Heavy walls provide shielding to the
surrounding rooms.
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A-class basement: Wet waste handling
• The position of the hot cell EDM is such that the water
circuit can be installed in the basement.
• By using a centrigue and self-cleaning filter,
radioactive cutting debris is removed.
• Also allocated for the wet waste handling is a glove
box for evaporation and then
packaging of residues.
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A-class basement: Shielded storage
• Dry waste is sorted by customer, type
and radioactivity.
• Low-level waste is packed in waste
drums and temporarily stored.
• Test specimens are stored in an
indexed, shielded storage system.
• A database system maintains the
inventory information.
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A-class hot cell facilitiesPlace for a photo
(no lines around photo)
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A-class hot cell facilities for handling activated metals
Mechanical testing
• Tensile
• Impact
• Fracture toughness
• Crack growth rate
• Hardness
Fabrication procedures
• Electrodischarge maching
• Electron beam welding
• Mechanical sawing & milling
Microscopy
• Grinding, polishing, etching
• Light microscopy
• Dimension measurements
Special purpose test set-ups
• biaxial creep (fuel cladding)
• corrosion in simulated LWR
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Cell 1.1
EDM
Cell 1.2
EBW
Cell 1.3
Metallog.Cell 1.4
Mech.test
Cell 1.5
Mech.test
Cell 1.6
Measuringhorizontal
transfer
Facility
cask port
Access to
secondary
airspace
A-class hot cell facilities for handling activated metals
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A-class hot cell facilities relationship b/n floors
Cell 3.1
Cask receiving
Elevator to 1.7
Cell 1.4
Mech.testCell 1.5
Mech.test
Cell 1.6
Measuring
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Custom ITD design for shielded transport system
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• Most devices involved in materials testing
are standard, so need hands-on access.
• Small hot cell staff, so full nuclearization
of devices and training for remote use is
untenable.
• Solution: glove-box inserts in the cells,
whereby the equipment is integrated.
• Area where hot materials are required to
be handled is relatively small.
o requires much smaller manipulators.
• When sources are removed, personnel
can access the equipment from rear of
cell for maintenance, calibration, etc.
A-class hot cell facilities for handling activated metals
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A-class hot cell facilities for handling activated metals
Fabrication of frames and containment
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Facility cask
docking port
Manipulators
Control
panels
Camera display
Hoist
control
Pressure,
temperature and
dose rate
displays
A-class hot cell facilities for handling activated metals
FAT of first unit
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Facility cask
docking
Two working stations
2 windows
4 manipulators
Hoist
electrical x- and z-axis
manual y-axis
Electical sockets
Camera / display connections
Dose rate probe
Temperature probe
Pressure difference probe
Lighting
Pass-through
ports
Cable feed throughs
Maintenance ports
Horizontal
tranfer rail
A-class hot cell facilities for handling activated metals
Inside a cell
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Facility cask docking HC1.6
Pass-through ports between
HC1.6 / 1.5 and HC1.3 / 1.2 Elevator between HC3.1 / 1.7
Horizontal tranfer rail
A-class hot cell facilities for handling activated metalsA-class hot cell facilities for handling activated metalsA-class hot cell facilities for handling activated metals
Material transport between cells
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Cask transfer by pallet druck Cask lifting in docking station
Opening of cask plug Cask ready for un-/loading
A-class hot cell facilities for handling activated metals
Facility cask docking principle
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Horizontal
tranfer rail
Maintenance
access port
A-class hot cell facilities for handling activated metals
View through the leaded glass window
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VTT took over the laboratory wing of the new Center for Nuclear Safety in May.
Moving of laboratory equipment into the new facilities is well underway.
Official inauguration event was on September 20th; focus was Finnish clientele.
Tests on non-active specimens have resumed as each device has come on-line in
their new setting.
Tests on non-active specimens have resumed as each device has come on-line in
their new setting.
Application for nuclear safeguards permit
has been submitted to STUK.
Application for rad-facility operating
license was submitted to STUK in
October.
License will be expanded in 2017 once the
hot-cells are installed.
The CNS today
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CNS as a national research infrastructure
• CNS was profiled in the YTERA final seminar.
• Academy of Finland Centre of Excellence proposal has been submitted to
Academy of Finland featuring the CNS as a core member with Aalto
University, Helsinki University and Tampere University of Technology.
• Academy of Finland Finnish Research Infrastructure proposal submitted
featuring the Jules Horowitz Reactor for materials irradiations and CNS
and Aalto U. post-irradiation examination facilities.
• Near-term VTT-Aalto collaboration is focused on Positron Annihilation
Spectroscopy of irradiation induced point-defects.
• VTT is also supporting Aalto’s small grant proposal
for specifically bringing the PAS into the CNS to
enable use for irradiated materials.
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TECHNOLOGY FOR BUSINESS