atw 2015-01

inforum

atw Vol. 60 (2015) | Issue 1 ı January

36

AMNT 2014

Bruno Jasper explained “The Powder Metallurgical Route to

Tungsten-Fiber Reinforced Tungsten”. His co-authors were J.W.

Coenen, Ch. Linsmeier (both FZJ) and J. Riesch and J.-H. You

(Max-Planck-Institut für Plasmaphysik, Garching, Germany) as

well as A. Mohr (Ruhr Universität Bochum, Germany).

Tungsten structures can withstand high temperatures but

tungsten is a relatively brittle material. Tungsten-fiber reinforced

tungsten (Wf/W) composites are supposed to enable enhanced

toughness due to extrinsic energy dissipation mechanisms such as

interface debonding and plastic deformation of fibers. So far

Wf/W has been produced by Chemical Vapor Infiltration (CVI).

The crucial property of this material is a certain ability of the

fibers to move microscopically with respect to the surrounding

tungsten bulk. This feature is secured by very thin coatings of the

tungsten fibers, e.g. by erbium oxide. CVI does not damage neither

the fibers nor their coating. Unfortunately, CVI is limited to rather

small production rates.

B. Jasper and his colleagues are investigating alternative

methods, namely powder metallurgical routes of Wf/W production:

Hot Isostatic Pressing (HIP) and Electro Discharge Sintering

(EDS). The advantage of such a procedure could be much larger

production rates. It is, however, a big challenge not do damage

the fibers and their coatings during these new production processes

which impose high thermal and mechanical stresses onto

the fibers.

In this context, EDS might be the preferable process. During

EDS a powder is placed between two electrodes and then compacted

by a short but high energy pulse. In addition an axial pressure

is applied to increase the density even further.

First pure W samples showed high values for the relative density.

Investigations on samples including fibers are ongoing, supported

by comprehensive modelling efforts.

The Technical Session was chaired by Thomas Mull (AREVA

GmbH).

Competence, Innovation, Regulation:

Education, Expert Knowledge, Knowledge

Transfer

Jörg Starflinger

Design and Development of Training for Managers of a Nuclear

Operator (Anna Starynska, Spider Management Technologies

Ukraine; Ronald Landefeld, Christian Schönfelder and Robert Geisser,

AREVA GmbH): AREVA with their subcontractor Spider Management

Technologies Ukraine are currently implementing a consultancy

project with the objective to complete a management

training center of a nuclear operator. As an important milestone,

the development as well as the training needs analysis of managers

has been completed recently, and accepted by executive

management of the operator. In the paper the methodology used

has been described, the connection of development needs with

the strategic reorientation of the operator and the contribution of

management training to achieving the strategic goals of the utility,

in particular improvement of nuclear safety. The highest priority

of all activities of a nuclear operator shall be given to establish a

mechanism of permanent improvement of safety culture according

to IAEA-Safety Series No. 75-INSAG-4.

Based on a management competence model, a special tool –

the Individual Training and Development Plan – was elaborated

for managers’ appraisal, identification of training needs, elaboration

of individual plans for development of managers and trainers,

and monitoring of the personal development process.

In summary, the utilization of the competence model allows

establishing, forming and developing preferable behaviour of

managers in the context of creation of necessary operation culture.

Individual training and development plans for managers are

an efficient and effective tool of implementation of the operator’s

middle and long term strategy.

Support of an University Nuclear Master Course by a Nuclear

Supplier (Tomas Bajer, AREVA NP Controls, s.r.o.; Vladimir

Slugen, Slovak University of Technology; Stefan Glaubrecht and

Christian Schönfelder, AREVA GmbH): The cooperation between

the Institute of Nuclear and Physical Engineering FEI STU, University

of Bratislava, Slovak Republic, and AREVA has been presented. This

cooperation is considered as a win-win arrangement for all stakeholders,

the university, students and AREVA. The university can

rely on state-of-the-art technologies for its education activities,

expand its lecture offer and establish an international scope. Students

will gain a deeper comprehension of current issues in nuclear

Instrumentation&Control and they will be better prepared for

their future job positions and career perspectives. AREVA will profit

from the students’ enhanced specific knowledge on nuclear technology

and access to well-educated and motivated graduates.

As an example the preparation and delivery of specialized lectures

and practical exercises for an upcoming new subject “Measurement

and control in nuclear power plants”, focusing on stateof-the-art

technologies, especially TELEPERM ® XS (TXS), which

is also used in Slovak NPPs of VVER-440 type. AREVA contributed

to four of the twelve lectures of the university course.

This cooperation will be formalized in the near future by concluding

an agreement detailing the scope of the cooperation. The

cooperation could also be extended in the future, e.g. by expanding

the number of lectures and lab works that are supported by

AREVA, by organizing student internship and Master theses in

AREVA facilities, or even by performing joint R&D projects.

Practical Implementation Methodologies of Preserving

Competence in Nuclear Power Plants (Michael Burkhard, GiS -

Gesellschaft für integrierte Systemplanung mbH): To preserve competence

and knowledge in nuclear power plants, professional tools

are in use in the area of maintenance and operations, so-called “Enterprise

Asset and Operations Management Solution (EAM)”. Such

a system contains operational data, maintenance instructions,

technical specifications, historical data, etc. It can be extended to a

Knowledge Preservation System (KPS), which contributes to prevent

the loss of knowledge, that processes can be optimized by utilizing

experience and to extend of the power plant’s life cycle. If the

KPS is established in a very early stage, information is inserted in a

less filtered way. That way it is possible not only to learn from best

practices but also to prevent doing the same mistakes twice. As soon

as this is achieved, learning from best practices as well as learning

from mistakes, it is very likely that the power plant is optimally prepared

for a technically and economically optimized future.

The main target and the focus has to be on gathering data in a

sufficient way whilst enabling users to get those information attached

directly to their actual work so they get the information

they need at the right time, in the right context and in the appropriate

details. Such system has been applied successfully in several

nuclear power plants in Germany and Switzerland.

Authors:

Angelika Bohnstedt

Karlsruher Institut für Technologie (KIT)

Programm Nukleare Sicherheitsforschung (NUKLEAR)

KIT Campus Nord, Gebäude 433

Hermann-von-Helmholtz-Platz 1

76344 Eggenstein-Leopoldshafen/Germany

Thomas Mull

AREVA GmbH

Nuclear Fusion, HTR and Transverse Issues (PTDH-G)

Paul-Gossen-Straße 100

91052 Erlangen/Germany

Prof. Dr.-Ing. Jörg Starflinger

Institutsleiter

Universität Stuttgart

Institut für Kernenergetik und Energiesysteme (IKE)

Pfaffenwaldring 31, 70569 Stuttgart/Germany

AMNT 2014

Key Topic | Reactor Operation, Safety – Report Part 3

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