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Status of IAEA International Database on Irradiated Graphite Properties with Respect to HTR Engineering Issues P.J. Hacker, B. McEnaney, A.J. Wickham Bath Nuclear Energy Group , University of Bath , UK. G. Haag Institut fr

SLIDE 1

Status of IAEA International Database on Irradiated Graphite Properties with Respect to HTR Engineering Issues P.J. Hacker, B. McEnaney, A.J. Wickham Bath Nuclear Energy Group, University of Bath, UK.

G. Haag

Institut für Sicherheitsforschung und Reaktortechnik- ISR 2 Forschungzentrum Jülich GmbH, Germany

SLIDE 2

Plan of Talk

Organisation & Management of

Database

Operation of the Database
Relevance to New Designs of HTR
Conclusions

Bath Nuclear Energy Group

Database Website: http://www-andis.iaea.org/graphite.html

SLIDE 3

Purpose of Graphite Database

facilitate development

national and international programmes on graphite moderated reactors and fusion technologies

To assist the safety authorities in the assessment of

safety aspects of graphite moderated reactors, including decommissioning

To serve as a comprehensive source of scientific

information for a broad range of material science applications, including non-nuclear technology.

SLIDE 4

Database Members

Full members:

– Germany (represented by FZJ) – Japan – United Kingdom – USA

Associate Member:

– Lithuania

Bath Nuclear Energy Group

SLIDE 5

Database Sponsors

NGOs that make voluntary contributions

to operation and maintenance of the Database.

Present Sponsors

– Toyo Tanso, Japan – Eskom Enterprises, South Africa

Bath Nuclear Energy Group

SLIDE 6

Steering Committee - Remit

Technical matters concerning the

Database

Development of operating procedures
Financial aspects
Annual report

Bath Nuclear Energy Group

SLIDE 7

Steering Committee- Membership

Germany

Dr G Haag, FZJ

Japan

Dr K Sawa, JAERI

Dr AJ Wickham*, Consultant

Dr TD Burchell, ORNL

Lithuania

Dr R Levinskas, LEI

IAEA representatives

* Chair until February 2002

Bath Nuclear Energy Group

SLIDE 8

Plan of Talk

Organisation & Management of

Database

Operation of the Database
Relevance to New Designs of HTR
Conclusions

Database Website: http://www-andis.iaea.org/graphite.html

Bath Nuclear Energy Group

SLIDE 9

Technical Objectives

User friendly using Microsoft Access 97
No specialist IT knowledge
Clear presentation of data
Flexible methods of data retrieval
Flexible structure for different data types
Secure methods of data distribution by CD

ROM

Bath Nuclear Energy Group

SLIDE 10

Classification of Data

Unrestricted data – open literature data

& data for free dissemination

Restricted data – available for non-

commercial purposes to other Database members by CD ROM

L2 Restricted data – as Restricted data

but users sign confidentiality agreement with data supplier

SLIDE 11

Types of data

Changes in physical & mechanical properties
f nuclear graphites upon fast neutron

irradiation

Differing units, standards and definitions are

an issue

Those used by the data supplier are entered

in the Database

Conversion factors are available in the

Database

Bath Nuclear Energy Group

SLIDE 12

Examples of Data

Sample characterisation

–

Irradiation temperature

–

Fluence

–

Graphite grade

–

Experiment number, etc

Crystalline parameters

–

a, c, La, Lc etc

Elastic moduli
Electrical resistivity
Coefficient of thermal

expansion

Density and porosity
Thermal conductivity
Strength

–

Tensile,

–

Flexural,

–

Compressive

Poisson’s ratio
Dimensional change
Irradiation creep properties

–

Applied stress

–

Creep strain etc

Acoustic properties
Stored energy

SLIDE 13

Using the Database

Program Codes etc Tables Reports Query Screens

Tables – Spreadsheets of data from Volumes Volumes – Original data sources stored in Database Reports – Outputs from the Database

SLIDE 14

Using the Database

Select Country of Origin of Data
Select Experiments from Volumes of

Data

Select desired Properties to obtain

Report

Refine Report by Sorting and Filtering
Export refined Report to User’s

applications, e.g., Microsoft Excel.

SLIDE 15

Plan of Talk

Organisation & Management of

Database

Operation of the Database
Relevance to New Designs of HTR
Conclusions

Database Website: http://www-andis.iaea.org/graphite.html

Bath Nuclear Energy Group

SLIDE 16

Relevance to New Designs of HTR

The Database contains data that is relevant

to the irradiation temperature – neutron fluence domains for various designs of HTR.

Data for new types of graphite being

considered for new HTR designs may not be incorporated, but generic data in the Database may be useful for scoping studies.

Desirable that new MTR data be incorporated

into the Database to extend its usefulness.

SLIDE 17

Operating Temperature & Lifetime Neutron Fluence for Graphite Components in the HTR-500

0.4 700

Bottom reflector

0.8 675 5.0 Core 1.2 650 4.0 Core 1.9 475 3.0 Core 3.4 450 2.0 Core 1.5 250

Top reflector

Fluence/

1022 n cm-2(EDN)

Operating temp/ oC Depth/m Component

SLIDE 18

Effect of Neutron Irradiation in the Range 720-770 oC upon the Young’s Modulus of a Nuclear Graphite

5 10 15 20 25 30 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Normalised Young's Modulus E/Eo Neutron Fluence/ 10

20 n cm

2 (EDN)

Bath Nuclear Energy Group

SLIDE 19

The Effect of Neutron Irradiation on the Relative Dimensional Changes of a Nuclear Graphite.

20 40 60 80

0.0 0.5

Radial, 1320-1420

Axial, 1350-1450

Relative dimensional change/% Neutron fluence/ 10

20 n cm

2 (EDN)

Bath Nuclear Energy Group

SLIDE 20

Effect of Neutron Irradiation at 1115- 1165 oC upon the CTE of a Nuclear Graphite.

10 20 30 40 50

10 20

Relative CTE change/% Neutron fluence/ 10

20 n cm

2 (EDN)

Bath Nuclear Energy Group

SLIDE 21

Conclusions

The IAEA International Database on

Irradiated Graphite Properties contains much useful data for designers of new HTR

Its usefulness can be enhanced if additional,

extant data can be incorporated along with…..

Any new MTR data collected to support new

designs of HTR.

Database Website: http://www-andis.iaea.org/graphite.html

Bath Nuclear Energy Group

SLIDE 22

Acknowledgments

Mr RE Clark, IAEA
Dr J Stephens, IAEA
IAEA, Atomic & Molecular Data Unit,

Department of Nuclear Sciences & Applications

Bath Nuclear Energy Group

Database Website: http://www-andis.iaea.org/graphite.html