atw - June 2016

AMNT 2016: Opening Address
Radiological Characterization of Waste
Nuclear Power and Decarbonization
Decommissioning of the Rossendorf Isotope Production
Steam Condensation in Water

Chernobyl 30 Years On: Key Remediation and Safety Projects are ‘On Track’

NucNet

Thirty years after the accident at Chernobyl, key remediation and safety projects are on track and construction of the vital € 1.5 bn ($ 1.6 bn) New Safe Confinement (NSC) is almost finished with commissioning scheduled for November 2017, the company in charge of construction and the European Bank for Reconstruction and Development (EBRD) told NucNet. The NSC is the most high profile and expensive element of the € 2.15 bn Shelter Implementation Plan (SIP), a framework developed to overcome the consequences of the accident.

47th Annual Meeting on Nuclear Technology (AMNT 2016): Opening Address

Ralf Güldner

The 47th Annual Meeting on Nuclear Technology (AMNT 2016) was an excellent opportunity for a comprehensive outlook on nuclear technology, fostering international exchange in industry, research, politics and administration. Ralf Güldner, President of the German Atomic Forum (DAtF) talked about important decisions in nuclear energy in Germany in 2016. Finally, Güldner noticed that even with a phase out, Germany needs nuclear expertise and competent people for the upcoming challenges and international cooperation. In this context, also publicly-financed education and research are indispensable.

Quantitative Radiological Characterization of Waste: Integration of Gamma Spectrometry and Passive/Active Neutron Assay

Gianluca Simone, Egidio Mauro, Filippo Gagliardi and Edoardo Gorello 

The radiological characterization of drums through Non-Destructive Assay (NDA) techniques commonly relies on gamma spectrometry. This paper introduces the procedure developed in Nucleco for the NDA radiological characterization of drums when the presence of Special Nuclear Material (SNM) is expected/observed. The procedure is based on the integration of a gamma spectrometry in SGS mode (Segmented Gamma Scanner) and a passive/active neutron assay. The application of this procedure is discussed on a real case of drums. The extension of the integration procedure to other gamma spectrometry systems is also discussed.

Christian Raetzke

The Belgian reactors Tihange 2 and Doel 3 have been restarted in November 2015 after the problem of hydrogen flakes in the reactor pressure vessels had been investigated. The permission to restart has been the object both of critical statements by the German Federal Ministry of the Environment (BMUB) and of lawsuits filed with Belgian law courts by a group of German municipalities led by the city of Aachen and by the Land North-Rhine-Westphalia. According to a general principle of the law of nations, a state is not permitted to operate installations near its border, which cause significant environmental damage in a neighbouring state. However, it is not quite clear how this principle applies to the issue of potential accidents of nuclear power plants. According to the author, a tangible threat of an accident is required; mere doubts and concerns about the extent of safety margins are not sufficient.

Requirements to Nuclear Power to Significantly Contribute to Decarbonization

Reinhard Zipper

By the end of the UN Climate Conference 2015 in Paris all members agreed to take action with the goal to limit climate warming to less than 2 °C compared to pre-industrial status. CO2 emissions are supposed to be the main driver of climate change. This implies that all kinds of energy supply must be reengineered to avoid deployment of fossil fuels as far as practicable. Nuclear energy has a minimal CO2 footprint and with the ability to flexibly adjust to the individual demands of supply regions it may be favored to play a major role in decarbonization. However, on this path some principal obstacles must be removed to gain general public, policy and industry acceptance.

Redesign and Modernization of Radioactive Waste Administration Systems in Ukraine

Gerald H. Nieder-Westermann, Thorsten Walther and Jürgen Krone 

The European Commission (EC) has undertaken a series of projects to render assistance to Ukraine in modernizing and redesigning the Ukrainian approach to the administration, management and ultimately disposal of all forms of radioactive waste, including waste associated with the Chornobyl accident as well as waste generated as part of the Ukrainian energy infrastructure and from industrial and medical applications. One of the most recently completed projects focused on modernizing Ukraine's management and administrative systems responsible for the disposal of radioactive waste.

Application of Objective Provision Tree to Development of Standard Review Plan for Sodium-cooled Fast Reactor Nuclear Design

Moo-Hoon Bae, Namduk Suh, Yongwon Choi and Andong Shin

A systematic methodology was developed for the standard review plan for sodium-cooled fast reactor nuclear design. The process is first to develop an objective provision tree of sodium-cooled fast reactor for the reactivity control safety function. The provision tree is generally developed by designer to confirm whether the design satisfies the defense-in-depth concept. Then applicability of the current standard review plan of nuclear design for light water reactor to sodium-cooled fast reactor was evaluated and complemented by the developed objective provision tree.

Decommissioning and Dismantling of the Rossendorf Isotope Production – Part II: Aspects of Implementation

Thomas Grahnert, Sven Jansen, Wolfgang Boeßert and Steffen Kniest

After just over 40 years of production operation 2000, the operation of the Rossendorf Isotope Production was finally stopped. In the last few years of production already sections of the Rossendorf Isotope Production have been decommissioned. With the end of the isotope production the decommissioning of the entire complex started. In the two-part report, the decommissioning and dismantling of the Rossendorf Isotope production is presented. In part 1 (atw 5/2016) mainly the authorisation procedures and the realised decommissioning concept are presented. Part 2 (atw 6/2016) deals with special selected aspects of the implementation of the decommissioning programme.

Simulation of Research Loop LOBI-MOD2 with RELAP5\MOD3.3 Code for LOBI Thermo Hydraulic Test A1-93

Farshad Pesaran and Ramin Barati 

RELAP5/MOD3.3 is one of the used computer codes for the simulation of event thermal-hydraulics of nuclear power plants. The LOBI test facility is a full-power high-pressure integral system test facility, representing an approximately 1 : 700 scale model of a 4-loop, 1300 MWe PWR. A new simulation of the small break LOCA test A1-93 has been carried out in a LOBI/Mod2 facility for reaching good agreement and to evaluate the performance of the RELAP5\MOD3.3 code. Good agreement was obtained in general between the code predictions and the experimental data in transient state.

Dynamic Characteristics of the Steam Condensation Due to a Multi-hole Sparger

Xiangbin Li, Nan Li and Mengchao Zhang 

In order to deeply understand the mechanism of the steam jet with a multi-hole sparger, the dynamic characteristics of direct contact condensation of the steam submerged in a subcooled water pool are simulated by means of commercial software. The jet shapes are compared with experimental results. It is found that the numerical results were in good agreement with the experimental ones.

Those Who ‘Cry Wolf’ About Nuclear Safety Damage Their Own Credibility

John Shepherd 

Do you recall the fable of the boy who cried wolf? I was reminded of this following the latest call by Germany's Federal Environment Minister, Barbara Hendricks, for Belgium to take two of its nuclear reactors off the grid, citing “questions” about the units' safety. Those in positions of power and influence in one country should take care to be as responsible in their dealings with their neighbours as they are in handling domestic matters of state. Those who see ‘danger’ where there is none are not being good neighbours. They are generating fear and alarm without good cause and should mind their own business.

 

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