Stephan Leyer

The integral test facility karlstein

The Integral Test Facility Karlstein (INKA) test facility was designed and erected to test the performance of the passive safety systems of KERENA, the new AREVA Boiling Water Reactor design. The experimental program included single component/system tests of the Emergency Condenser, the Containment Cooling Condenser and the Passive Core Flooding System. Integral system tests, including also the Passive Pressure Pulse Transmitter, will be performed to simulate transients and Loss of Coolant Accident scenarios at the test facility. The INKA test facility represents the KERENA Containment with a volume scaling of 1 : 24. Component heights and levels are in full scale. The reactor pressure vessel is simulated by the accumulator vessel of the large valve test facility of Karlstein—a vessel with a design pressure of 11 MPa and a storage capacity of 125 m3. The vessel is fed by a benson boiler with a maximum power supply of 22 MW. The INKA multi compartment pressure suppression Containment meets the requirements of modern and existing BWR designs. As a result of the large power supply at the facility, INKA is capable of simulating various accident scenarios, including a full train of passive systems, starting with the initiating event—for example pipe rupture.

Praktische Handhabung und Kunst der Modellwahl

Es lassen sich nur Dinge gleicher Gattung oder von gleicher Art miteinander vergleichen. Diese einschrankende Notwendigkeit der Betrachtung insbesondere naturwissenschaftlicher Sachverhalte ist der wesentliche Inhalt der Dimensionshomogenitat. Hinter dieser scheinbaren Trivialitat verbirgt sich das gesamte Weltbild.

Monetär-technologisches Wechselspiel

Ein produzierendes Unternehmen besteht aus einem technologischen und einem monetaren Bereich, in dem Ingenieure und Kaufleute zusammenarbeiten, um Produkte herstellen und vermarkten zu konnen.

Effizienz der Pi Theorem Methodik

Die elementaren Anwendungen im voranstehenden Abschn. 3 zeigen, dass sich mit dem Π-Theorem bei einparametrischen Problemen (P1) effiziente Ergebnisse erzielen lassen.

Modell und Original

Die Ubertragung der am Modell gewonnenen Erkenntnisse auf das Original im Rahmen der Modelltechnik ist mit Ahnlichkeitsgesetzen verknupft. Ziel dieser Modelltechnik ist, dass am Modell gewonnene Erkenntnisse nicht immer wieder durch neue aufwendige Experimente zu erganzen oder zu wiederholen sind, um diese auf das Original anwenden zu konnen.

RF Negative Ion Source Development at IPP Garching

IPP Garching is heavily involved in the development of an ion source for Neutral Beam Heating of the ITER Tokamak. RF driven ion sources have been successfully developed and are in operation on the ASDEX‐Upgrade Tokamak for positive ion based NBH by the NB Heating group at IPP Garching. Building on this experience a RF driven H− ion source has been under development at IPP Garching as an alternative to the ITER reference design ion source. The number of test beds devoted to source development for ITER has increased from one (BATMAN) by the addition of two test beds (MANITU, RADI). This paper contains descriptions of the three test beds. Results on diagnostic development using laser photodetachment and cavity ringdown spectroscopy are given for BATMAN. The latest results for long pulse development on MANITU are presented including the to date longest pulse (600 s). As well, details of source modifications necessitated for pulses in excess of 100 s are given. The newest test bed RADI is still being commissi...

Metallic and non-metallic lanthanum hydrides studied by means of nuclear magnetic resonance

Abstract 139 La nuclear magnetic resonance (T1, linewidth) is measured for lanthanum hydrides LaHx (2.0≤x≤3.0) at temperatures between 4 K and 300 K at a Larmor frequency of 42.44 MHz. Resonance line narrowing and the increase of the spin-lattice relaxation rate for temperatures above 200 K, originating from the well-established type of thermally activated proton hopping motion in lanthanum hydrides, are observed. A Korringa relaxation contribution is separated in the low-temperature range (T≤80 K) for the dihydride as well as for the samples LaHx in the concentration range, where the metal–non-metal transition is suggested to occur.