atw 2018-09v3


atw Vol. 63 (2018) | Issue 8/9 ı August/September



A Stark Warning to Trump on China, Russia

and the ‘Crisis’ Facing US Nuclear Industry

NucNet, David Dalton | Page 434

The US has the largest number of nuclear plants in

the world – 99 in commercial operation at the time

of writing – but its global leadership position is said

to be declining as efforts to build a new generation

of reactors have been plagued by problems, and

aging plants have been retired or closed in the face

of economic, market, and financial pressures. A

recent report by the Atlantic Council issued a

stark warning, arguing that the US nuclear energy

industry is facing a crisis that the Trump administration

must immediately address as a core part of

its “all of the above” energy strategy.

Akademik Lomonosov:

Preparations for Premiere in Full Swing

Roman Martinek | Page 437

At the end of July 2018, the loading of the floating

power unit Akademik Lomonosov with nuclear fuel

started in Murmansk. This is one of the key stages of

the project, which as of today has no analogues in the

world. In 2019, the power unit will begin to supply

local population and industrial facilities in North-

Eastern Siberia with heat and electricity. The project is

expected to open up opportunities for the mass production

of floating nuclear power plants – a number

of countries have already voiced their interest.

The Akademik Lomonosov is intended for providing

energy to remote industrial facilities, port cities, as

well as gas and oil platforms located on the high seas.

Nuclear Phase-out Last Act?

Are the New Compensation Regulations for

Frustrated Expenses in Accordance with the


Tobias Leidinger | Page 440

Shortly before it was passed, the legislature reacted

to the constitutional deficiencies which the Federal

Constitutional Court (BVerfG) objected to in its

judgment of 6 December 2016 on the nuclear

phase-out (BVerfGE 143, 246) and for which a

constitutional situation had to be established by

30 June 2018. However, the newly created compensation

regulations in the 16 th amendment to the

Atomic Energy Act raise new legal questions,

especially those relating to their constitutionality.

Westinghouse EnCore ® Accident

Tolerant Fuel

Gilda Bocock, Robert Oelrich

and Sumit Ray | Page 442

The development and implementation of accident

tolerant fuel (ATF) products, such as Westinghouse’s

EnCore® Fuel, can support the long-term

viability of nuclear energy by enhancing operational

safety and decreasing energy costs. The first introduction

of Westinghouse EnCore Fuel into a commercial

reactor is planned for 2019 as segmented

lead test rods (LTRs) utilizing chromium-coated

zirconium cladding with uranium silicide (U 3 Si 2 )

pellets. The EnCore Fuel lead test assembly (LTA)

program, with LTAs planned for 2022 insertion, will

introduce silicon carbide/silicon carbide composite

cladding with U 3 Si 2 pellets.

Analyses of Possible Explanations for the

Neutron Flux Fluctuations in German PWR

Joachim Herb, Christoph Bläsius, Yann Perin,

Jürgen Sievers and Kiril Velkov | Page 446

During the last 15 years the neutron flux fluctuation

levels in some of the German PWR changed

­significantly. During a period of about ten years, the

fluctuation levels increased, followed by about five

years with decreasing levels after taking actions like

changing the design of the fuel elements. The

­increase in the neutron flux fluctuations resulted in

an increased number of triggering the reactor

limitation system and in one case in a SCRAM.

Several models based on single physical effects are

used to simulate the neutron flux. Each of these

simple models can reproduce some of the characteristics

of the observed neutron flux fluctuations.

Detailed Measurements and Analyses of the

Neutron Flux Oscillation Phenomenology at

Kernkraftwerk Gösgen

G. Girardin, R. Meier, L. Meyer,

A. Ålander and F. Jatuff | Page 452

Recent investigations on measured neutron flux

noise at the Kernkraftwerk Gösgen-Däniken are

summarised. The NPP in operation since 1979 is a

German KWU pre-KONVOI, 3-Loop PWR with a

thermal power of 3,002 MWth (1,060 MWe). In a

period of approx. 7 cycles from 2010 to 2016, an

increase of the measured neutron noise amplitudes

in the in- and out-core neutron detectors has been

observed, although no significant variations have

being detected in global core, thermohydraulic

­circuits or instrumentation parameters. Verifications

of the instrumentation were performed and it was

confirmed that the neutron flux instabilities

increased from cycle to cycle in this period. In the last

two years, the level of neutron flux noise remains

high but seems to have achieved a saturation state.

Effects of Airborne Volatile Organic

Compounds on the Performance of Pi/TiO 2

Coated Ceramic Honeycomb Type Passive

Autocatalytic Recombiner

Chang Hyun Kim, Je Joong Sung,

Sang Jun Ha and Phil Won Seo | Page 457

Ensuring the containment integrity during a severe

accident in nuclear power reactor by maintaining the

hydrogen concentration below an acceptable level

has been recognized to be of critical importance after

Fukushima Daiichi accidents. Although there exist

various hydrogen mitigation measures, a passive

autocatalytic recombiner (PAR) has been considered

as a viable option for the mitigation of hydrogen risk

under the extended station blackout conditions

because of its passive operation char acteristics for

the hydrogen removal. As a post- Fukushima action

item, all Korean nuclear power plants were equipped

with PARs of various suppliers. The capacity and

locations of PAR as a hydrogen mitigation system

were determined through an extensive analysis for

various severe accident scenarios.

49 th Annual Meeting on Nuclear Technology

(AMNT 2018): Young Scientists Workshop

Jörg Starflinger | Page 463

During the Young Scientists Workshop of the 49 th

Annual Meeting on Nuclear Technology (AMNT

2018), 29 to 30 May 2018, Berlin, 13 young

­scientists presented results of their scientific

research as part of their Master or Doctorate theses

covering a broad spectrum of technical areas. Vera

Koppers, Katharina Amend and Maria Freiria were

awarded for their presentations by the jury.

Heuristic Methods in Modelling Research

Reactors for Deterministic Safety Analysis

Vera Koppers and Marco K. Koch | Page 464

A new method for rapid and reliable modelling of

research reactors for deterministic safety analysis is

presented. A rule-based software system is being

developed to support the modelling process in

ATHLET for selected research reactor types in the

light of limited available data. The fundamental

elements of the input deck are generated automatically

by few input data necessary.

Development and Validation of a

CFD Wash-Off Model for Fission Products

on Containment Walls

Katharina Amend and Markus Klein | Page 469

The research project aims to develop a CFD model

to describe the run down behavior of liquids and the

resulting wash-down of fission products on surfaces

in the reactor containment. The paper presents a

three-dimensional numerical simulation for water

running down inclined surfaces coupled with an

aerosol wash-off model and particle transport using

OpenFOAM. The wash-off model is based on Shields

criterion. A parameter variation is conducted and

the simulation results are compared to experiments.

A Preliminary Conservative Criticality

Assessment of Fukushima Unit 1 Debris Bed

María Freiría López, Michael Buck and

Jörg Starflinger | Page 473

A conservative criticality evaluation of Fukushima

Unit 1 debris bed has been carried out. In order to

obtain a multi-dimensional criticality map, parameters,

such as debris size, porosity, particle size, fuel

burnup, water density and boration were varied. As

a result, safety parameter ranges where recriticality

can be excluded have been identified. It was found

that most of the possible debris would be inherently

subcritical because of its porosity and 1600 ppm B

would ensure subcriticality under any conditions.

49 th Annual Meeting on Nuclear Technology

(AMNT) Key Topic | Outstanding Know-How

& Sustainable Innovations

Christian Raetzke | Page 477

The report summarises the presentations of the

Focus Session International Regulation | Radiation

Protection: The Implementation of the EU Basic

Safety Standards Directive 2013/59 and the Release

of Radioactive Material from Regulatory Control

presented at the 49 th AMNT 2018, Berlin, 29 to 30

May 2018.

Report: GRS Workshop “Safety of Extended

Dry Storage of Spent Nuclear Fuel”

Klemens Hummelsheim, Florian Rowold

and Maik Stuke | Page 480

Conference report on the GRS Workshop “Safety of

Extended Dry Storage of Spent Nuclear Fuel”, 6 to 8

June 2018.

Why do We Allow Nuclear to Take the

‘Silly Season’ Media Heat?

John Shepherd | Page 490

The time of year always means all manner of weird

and wonderful stories finding their way into the

news. For the nuclear industry, the hot spell fanned

the media flames of an old anti-nuclear favourite, as

it became clear operations at some nuclear power

plants were being halted temporarily to comply

with restrictions that prevent cooling water further

heating local rivers and waterways. It’s a question

why the nuclear community does not use the time

of year to communicate their important and

interesting topics.

Abstracts | English

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