QUESTIONNAIRE
FOR POTENTIAL CRP PARTICIPANTS
Establishment of Material Properties Database for Irradiated Core Structural
Components for Continued Safe Operation and Lifetime Extension of Ageing
Research Reactors
Please provide, when possible, your
Country:
Name*:
Title/position:
Affiliation:
E
-
mail*:
*The names and addresses will not be disclosed to any third parties but are needed, should we
need further clarification or follow up regarding the questionnaire
.
The proposed CRP will provide a forum
for input and discussion of relevant materials data and
operating experience with research reactors leading to establishment of a “
Research Reactor
Components and Material Properties Database
” to be used by research reactor operators and
regulators to help
predict ageing related degradation so as to mitigate lengthy and costly shutdowns
and to promote safe and reliable operation and lifetime extension. The Database will be a
compilation of data from research reactor operator input, comprehensive literature
reviews and
experimental data from research reactor. The Database will be provided to all potential end users of
Member States to provide a structure for future incorporation of new data that becomes available.
Moreover, the CRP will specify further activi
ties needed to address the identified data gaps of the
Database for potential follow
-
on activities required by Member States.
The purpose of this
questionnaire is to collect from Member States operating RRs (≥1MW) preliminary information on
the
needs and
t
ypes of activities
considering the prediction of ageing related degradation of core
components.
In
order to get an overview of the practices on follow up of
ageing
core structural
materials and to define the CRP in a more efficient way, the operators or re
gulators involved in the
operation of research reactors are asked to answer
the
following questions:
Please note that this information is of interest, even if you do not want to participate in the CRP.
Deadline: you should submit this questionnaire electronically to
Andrea Borio di Tigliole
(
A.Borio@iaea.org
) or Nathan D. Peld (
N.D.Peld@iaea.org
)
1.
What are the components
and
materials
affected by ageing
in your facility?
2.
What information is available to you for those materials?
3.
What information is not available that you would like to have?
4.
What form of database would be most useful to you?
□
MS Access
□
MS Excel
(Spreadsheet)
□
DBase
□
SQL, (Dedicated Web
-
based)
□
Other (Please specify below)
5.
What specific monitoring and surveillance programmes are implemented at your
facility
to address ageing of core components and materials
?
APPENDIX
1
DATA NEEDED
FOR EVALUATION OF MATERIAL CAPABILITY TO PERFORM ITS
SAFETY FUNCTION:
Material properties for un
-
irradiated material and for high to very high neutron and gamma fluence for a
given material and at appropriate fast/thermal ratios:
Environment:
Definition
of fast and thermal neutron energies.
Fast to thermal ratio for each test.
Fluxes
Irradiation and test temperatures.
Coolant chemistry (e.g. for water: pH, conductivity; for NaK: mass ratio; for He: impurities)
Sample:
Definition of un
-
irradiated specimen
material (certificated composition and thermal
-
mechanical
treatment, material properties, residual stresses etc.).
Standard used for specimen manufacture.
Measurements and calculations:
Composition changes (chemical and isotopic) (calculated or measured?)
.
Displacements per atom (with method of determination).
Formation of loops and dislocation density (m
-
2
).
Voids and bubble density and composition (
1
H,
3
H, He) (% volume or m
-
2
).
Swelling (volume %).
Corrosion rate (dimensional, mass changes).
Changes in
resistance to Stress Corrosion Cracking (SSR test, ECP
-
diagram).
Changes in UTS, yield strength, 2% yield (MPa).
Changes in ductility (uniform and total elongation) (%).
Changes in fracture toughness (MPa.m
½
).
Changes in stress and strain driven fatigue p
roperties (threshold stress; N
f
with definition).
Changes in fatigue crack growth rate (da/dn).
The list above gives the main parameters of interest for most irradiated structural materials. Additional
parameters should be provided, as appropriate, for ma
terials with special applications. Some (non
-
exhaustive) examples follow:
Epoxy resins and glues: initial curing conditions and subsequent bond degradation with neutron
and gamma fluence,
Fastening and joining aspects: bolting (relaxation, galvanic), weldi
ng (heat affected zone,
galvanic), compatibility of materials,
Graphite: Swelling, accumulation of Wigner energy,
Zirconium: Growth, directionality of properties,
Concrete: density, compression strength.
Cable insulation: Insulation degradation.
APPENDIX
III
RESEARCH REACTOR CORE COMPONENTS AND MATERIALS
This Appendix contains a listing of typical research reactor core components and structures and the most
common materials used. In the Table, components that are generally fixed and difficult to replace
are
indicated by (1) and those that are more readily replaced are indicated by (2). The ease of replacement of
components is determined by the research reactor design and the indications given may not be accurate for
all designs.
Components
Materials
Co
mponents
Materials
Pressure(Tank) vessel + connecting pipes
Reflector Devices/Systems
Pressurized vessel (1)
Low alloy steel
Aluminium alloys
Stainless steel
Heavy Water tank &
accessories (1)
Aluminium alloys
Zirconium
Metallic sealing rings
Low
pressure tank (1)
Aluminium alloys
Stainless steel
Zirconium
Beryllium (1/2)
Beryllium
Aluminium
-
Be alloy
Connecting pipes (1/2)
Aluminium alloys
Stainless steel
Graphite (2)
Graphite
Beam ports/nozzles (1)
Aluminium alloys
Low alloy steels
Zirconium
Beam related devices, highly irradiated portion (2)
Poolside irradiation facility
(1)
Aluminium alloys
Stainless steel
Cold source
Zirconium
Aluminium alloys
Liners (Pool type RR) (1)
Aluminium alloys
Stainless steels
Epoxy resins
Ceramic tiles
Thermal
column
Zirconium
Aluminium alloys
Core support structure components
Neutron guide tubes
Aluminium alloys
Stainless steels
Core support grid (1/2)
Aluminium alloys
Stainless steels
Low alloy steels
Shielding structures
Other structural and internal
support structures
Aluminium alloys
Stainless steels
Low alloy steels
Concrete (1/2)
High density concrete
Structural concrete
Core box/vessel (1/2)
Aluminium alloys
Stainless steels
Low alloy steels
Lead (2)
Lead types
Guide Tubes (2) for:
Tungsten
(2)
Tungsten alloys
Control devices
Aluminium alloys
Stainless steels
Inconel
Zirconium
Other
Fuel elements
Aluminium alloys
Zirconium
Cables
Organic insulation
Experimental facilities
Aluminium alloys
Stainless steels
Inconel
Zirconium
Isotope
production
Aluminium alloys
Stainless steels
Zirconium
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