HTGR Knowledge Base
Conference Article: Investigations of an emergency shut-down system using small absorbing spheres for pebble-bed high temperature gas-cooled reactors
Ninaus, W.; Sgouridis, S.; Schuerrer, F.; Mueller, H.J.; Oswald, K. (Technische Univ., Graz (Austria). Inst. fuer Theoretische Physik und Reaktorphysik); Neef, R.D.; Schall, H. (Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Reaktorentwicklung)Abstract
An emergency shutdown system for high temperature gas-cooled pebble-bed reactors is proposed. By failure of the usual absorber rod system small boronated graphite spheres (called KLAK) trickle from the top reflector into the core by gravity and shut down the reactor by means of the strong absorbing effect of the KLAK. In order to examine an especially developed calculational procedure for binary mixtures of large fuel spheres and small absorbing spheres experimental investigations were made on a pebble-bed cell with installed well defined KLAK nests inside the assembly. The experiment was performed by using the Siemens-Argonaut-Reaktor Graz as a driver.
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key words: htgr type reactors; multiplication factors; neutron absorbers; reactivity worths; reactor safety experiments; scram; spheres; gas cooled reactors; graphite moderated reactors; reactor shutdown; reactors; shutdown
- Reference:
- Specialists' meeting on safety and accident analysis for gas-cooled reactors.
Oak Ridge, TN (USA). 13-15 May 1985
- International Atomic Energy Agency, Vienna (Austria)
- IAEA-TECDOC--358, pp:85-94
- International Atomic Energy Agency, Vienna (Austria)