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Report on HFR power cycling experiment MEDINA/POCY 02

Abstract

MEDINA or POCY 02 was a single rod experiment to study power ramp induced FCMI with the smear density parameter. Four separate fuel columns with different void volume redistribution were integrated in one rod. The irradiation device should allow for the measurements of the rod diameter along all fuel columns after each power cycle. Irradiation took place in the Pool Side Facility of the HFR in Petten from October 1985 through January 1988. The experiment had to be terminated prematurely due to mishandling of the capsule. The in-pile diameter measurements were of no use. Even though the primary goal was not attained, the experiment furnished some interesting insights into the fuel behaviour during cyclic operation. Mechanical interactions between fuel and cladding took place in all four fuel columns. Maximum rod diameter increase observed was 0,2%. The largest value was measured in the rod section where the original gap was the largest. Apparently, in cyclic operation a large gap does not ease the FCMI situtation. Fuel and fission product movements seem to be enhanced by cyclic operation. Large quantities of solid fission products in the central channel and large reaction zones in the gap between fuel and cladding were observed for  More>>
Authors:
Publication Date:
Sep 01, 1993
Product Type:
Technical Report
Report Number:
KFK-5217
Reference Number:
SCA: 210100; 210200; 220900; PA: DEN-94:0F4043; EDB-94:051460; NTS-94:020487; SN: 94001179982
Resource Relation:
Other Information: PBD: Sep 1993
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; FUEL RODS; PERFORMANCE TESTING; BWR TYPE REACTORS; PWR TYPE REACTORS; IRRADIATION; FUEL-CLADDING INTERACTIONS; SWELLING; DEFORMATION; TRANSIENTS; REACTOR OPERATION; POST-IRRADIATION EXAMINATION; 210100; 210200; 220900; POWER REACTORS, NONBREEDING, LIGHT-WATER MODERATED, BOILING WATER COOLED; POWER REACTORS, NONBREEDING, LIGHT-WATER MODERATED, NONBOILING WATER COOLED; REACTOR SAFETY
OSTI ID:
10139959
Research Organizations:
Kernforschungszentrum Karlsruhe GmbH (Germany). Projekt Nukleare Sicherheitsforschung; Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Materialforschung
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0303-4003; Other: ON: DE94756429; TRN: DE94F4043
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
41 p.
Announcement Date:
Jul 05, 2005

Citation Formats

Goetzmann, O. Report on HFR power cycling experiment MEDINA/POCY 02. Germany: N. p., 1993. Web.
Goetzmann, O. Report on HFR power cycling experiment MEDINA/POCY 02. Germany.
Goetzmann, O. 1993. "Report on HFR power cycling experiment MEDINA/POCY 02." Germany.
@misc{etde_10139959,
title = {Report on HFR power cycling experiment MEDINA/POCY 02}
author = {Goetzmann, O}
abstractNote = {MEDINA or POCY 02 was a single rod experiment to study power ramp induced FCMI with the smear density parameter. Four separate fuel columns with different void volume redistribution were integrated in one rod. The irradiation device should allow for the measurements of the rod diameter along all fuel columns after each power cycle. Irradiation took place in the Pool Side Facility of the HFR in Petten from October 1985 through January 1988. The experiment had to be terminated prematurely due to mishandling of the capsule. The in-pile diameter measurements were of no use. Even though the primary goal was not attained, the experiment furnished some interesting insights into the fuel behaviour during cyclic operation. Mechanical interactions between fuel and cladding took place in all four fuel columns. Maximum rod diameter increase observed was 0,2%. The largest value was measured in the rod section where the original gap was the largest. Apparently, in cyclic operation a large gap does not ease the FCMI situtation. Fuel and fission product movements seem to be enhanced by cyclic operation. Large quantities of solid fission products in the central channel and large reaction zones in the gap between fuel and cladding were observed for these short fuel stacks. Both ends of the annular pellet column were closed by fuel condensation. Pore migration was activated throughout the experiment. It was even capable of transporting cladding reaction products into the central hole. (orig.) [Deutsch] MEDINA oder POCY 02 war ein Einzelstabexperiment zur Untersuchung mechanischer Wechselwirkungen aufgrund von Leistungsrampen mit der Fuelldichte als Parameter. Vier voneinander getrennte Brennstoffsaeulen mit unterschiedlicher Leervolumenverteilung waren in einem Stab integriert. Die Bestrahlungskapsel sollte die Messung des Stabdurchmessers ueber alle Brennstoffsaeulen nach jedem Leistungszyklus erlauben. Die Bestrahlung wurde in der Pool Side Facility des HFR Petten in der Zeit vom Oktober 1985 bis Januar 1988 durchgefuehrt. Wegen eines Handhabungsschadens an der Kapsel musste es vorzeitig beendet werden. Die in-pile gemessenen Durchmesserwerte erwiesen sich als nicht brauchbar. Obwohl es mit diesem Versuchsziel nicht geklappt hat, gab es von diesem Experiment einige interessante Einsichten zum Brennstoffverhalten bei zyklischem Betrieb. Mechanische Wechselwirkungen zwischen Brennstoff und Huelle fanden bei allen 4 Brennstoffsaeulen statt. Sie fuehrten zu einer Durchmesservergroesserung der Huelle von maximal 0,2%. Der groesste Wert wurde im Stababschnitt mit dem groessten Brennstoff-Huelle-Spalt gemessen. Im Zyklierbetrieb wird also durch einen grossen Spalt die FCMI Situation nicht entspannt. Brennstoff- und Spaltprodukttransport wird durch den zyklischen Betrieb erhoeht. Grosse Ansammlungen von festen Spaltprodukten im Zentralkanal sowie grosse Reaktionszonen zwischen Brennstoff und Huelle wurden bei diesen kurzen Brennstoffsaeulen gefunden. Beide Enden der Ringtablettensaeule waren durch Brennstoffkondensat geschlossen. Porenwanderung blieb bis zum Ende des Experimentes erhalten. Sie war in der Lage, Huellreaktionsprodukte bis in den Zentralkanal zu transportieren. (orig.)}
place = {Germany}
year = {1993}
month = {Sep}
}