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Microstructure alterations in the base material, heat affected zone and weld metal of a 440-VVER-reactor pressure vessel caused by high fluence irradiation during long term operation: material: 15 Ch2MFA {approx} 0, 15 C-2,5 Cr-0, 7Mo-0,3 V; Veraenderungen der Mikrostruktur in Grundwerkstoff, WEZ und Schweissgut eines 440-VVER-Reaktordruckbehaelters, verursacht durch Neutronenbestrahlung im langzeitigen Betrieb; Werkstoff: 15 Ch2MFA {approx} 0,15 C-2,5 Cr-0, 7Mo-0,3 V

Abstract

Within the scope of the Tacis `91/1.1 project of the European Community, ``Reactor Vessel Embrittlement``, specimens were taken from the heavily irradiated circumferential welds of a VVER pressure vessel. The cumulated fast neutron fluence in the specimens amounts to up to 6.5 x 10{sup 19} cm{sup -}2 (E > 0.5 MeV). For the multi-laboratory, coordinated study, the specimens were cutted for mechanical testing as well as analytical, microstructural and microanalytical examinations in the base metal, HAZ and weld metal with respect to the effects of reactor operatio and post-irradiation annealing as well as thermal treatment (475 C, 560 C). The analytical transmission electron microscopy (200 kV) revealed the alterations found in the mechanical properties to be due to the formation of black dots and irradiation-induced segregations and accumulations of copper and carbides. These effects, caused by operation, (neutron radiation, temperature), are much more significant in the HAZ than in the base metal. (orig./CB) [Deutsch] Im Rahmen des von der Europaeischen Union beauftragten Tacis `91/1.1 Programms `Reactor Vessel Embrittlement` wurden Bohrkerne aus dem hochbestrahlten Rundnahtbereich eines VVER-Reaktordruckbehaelters entnommen. Die kumulierte schnelle Neutronenfluenz in diesen Proben betraegt bis zu 6,5 x 10{sup 19} cm{sup -2} (E>0,5 MeV). In einer gemeinschaftlichen Untersuchung wurden  More>>
Authors:
Maussner, G; Scharf, L; Langer, R; [1]  Gurovich, B [2] 
  1. Siemens AG Energieerzeugung KWU, Erlangen (Germany)
  2. Russian Research Centre Kurchatov Inst., Moscow (Russian Federation)
Publication Date:
Nov 01, 1998
Product Type:
Conference
Report Number:
INIS-DE-0022; CONF-9710266-
Reference Number:
SCA: 360106; 210200; PA: DEN-98:0FG176; EDB-98:119772; SN: 98002017874
Resource Relation:
Journal Volume: 193; Journal Issue: 3; Conference: 23. MPA seminar: safety and reliability of plant technology with special emphasis on nuclear technology - behaviour of pressurized components and systems at increased loading, 23. MPA-Seminar: Sicherheit und Verfuegbarkeit in der Anlagentechnik mit dem Schwerpunkt Kerntechnik - Verhalten von druckfuehrenden Komponenten und Systemen bei erhoehten Belastungen, Stuttgart (Germany), 1-2 Oct 1997; Other Information: PBD: [1998]; Related Information: Is Part Of 23. MPA-Seminar: Safety and reliability of plant technology with special emphasis on behaviour of pressurized components and systems at increased loading. Vol. 2. Papers 27-50; PB: 431 p.; 23. MPA-Seminar: Sicherheit und Verfuegbarkeit in der Anlagentechnik mit dem Schwerpunkt Verhalten von druckfuehrenden Komponenten und Systemen bei erhoehten Belastungen. Bd. 2. Vortraege 27-50
Subject:
36 MATERIALS SCIENCE; 21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; MICROSTRUCTURE; WELDED JOINTS; HEAT AFFECTED ZONE; STEEL-CR2MOV; PRESSURE VESSELS; IRRADIATION; NEUTRONS; WWER TYPE REACTORS; FILLER METALS
OSTI ID:
667743
Research Organizations:
Stuttgart Univ. (Germany). Staatliche Materialpruefungsanstalt
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: ISSN 0029-5493; Other: ON: DE99704622; TRN: DE98FG176
Availability:
INIS; OSTI as DE99704622
Submitting Site:
DEN
Size:
pp. 34.1-34.19
Announcement Date:

Citation Formats

Maussner, G, Scharf, L, Langer, R, and Gurovich, B. Microstructure alterations in the base material, heat affected zone and weld metal of a 440-VVER-reactor pressure vessel caused by high fluence irradiation during long term operation: material: 15 Ch2MFA {approx} 0, 15 C-2,5 Cr-0, 7Mo-0,3 V; Veraenderungen der Mikrostruktur in Grundwerkstoff, WEZ und Schweissgut eines 440-VVER-Reaktordruckbehaelters, verursacht durch Neutronenbestrahlung im langzeitigen Betrieb; Werkstoff: 15 Ch2MFA {approx} 0,15 C-2,5 Cr-0, 7Mo-0,3 V. Germany: N. p., 1998. Web. doi:10.1016/S0029-5493(99)00192-2.
Maussner, G, Scharf, L, Langer, R, & Gurovich, B. Microstructure alterations in the base material, heat affected zone and weld metal of a 440-VVER-reactor pressure vessel caused by high fluence irradiation during long term operation: material: 15 Ch2MFA {approx} 0, 15 C-2,5 Cr-0, 7Mo-0,3 V; Veraenderungen der Mikrostruktur in Grundwerkstoff, WEZ und Schweissgut eines 440-VVER-Reaktordruckbehaelters, verursacht durch Neutronenbestrahlung im langzeitigen Betrieb; Werkstoff: 15 Ch2MFA {approx} 0,15 C-2,5 Cr-0, 7Mo-0,3 V. Germany. doi:10.1016/S0029-5493(99)00192-2.
Maussner, G, Scharf, L, Langer, R, and Gurovich, B. 1998. "Microstructure alterations in the base material, heat affected zone and weld metal of a 440-VVER-reactor pressure vessel caused by high fluence irradiation during long term operation: material: 15 Ch2MFA {approx} 0, 15 C-2,5 Cr-0, 7Mo-0,3 V; Veraenderungen der Mikrostruktur in Grundwerkstoff, WEZ und Schweissgut eines 440-VVER-Reaktordruckbehaelters, verursacht durch Neutronenbestrahlung im langzeitigen Betrieb; Werkstoff: 15 Ch2MFA {approx} 0,15 C-2,5 Cr-0, 7Mo-0,3 V." Germany. doi:10.1016/S0029-5493(99)00192-2. https://www.osti.gov/servlets/purl/10.1016/S0029-5493(99)00192-2.
@misc{etde_667743,
title = {Microstructure alterations in the base material, heat affected zone and weld metal of a 440-VVER-reactor pressure vessel caused by high fluence irradiation during long term operation: material: 15 Ch2MFA {approx} 0, 15 C-2,5 Cr-0, 7Mo-0,3 V; Veraenderungen der Mikrostruktur in Grundwerkstoff, WEZ und Schweissgut eines 440-VVER-Reaktordruckbehaelters, verursacht durch Neutronenbestrahlung im langzeitigen Betrieb; Werkstoff: 15 Ch2MFA {approx} 0,15 C-2,5 Cr-0, 7Mo-0,3 V}
author = {Maussner, G, Scharf, L, Langer, R, and Gurovich, B}
abstractNote = {Within the scope of the Tacis `91/1.1 project of the European Community, ``Reactor Vessel Embrittlement``, specimens were taken from the heavily irradiated circumferential welds of a VVER pressure vessel. The cumulated fast neutron fluence in the specimens amounts to up to 6.5 x 10{sup 19} cm{sup -}2 (E > 0.5 MeV). For the multi-laboratory, coordinated study, the specimens were cutted for mechanical testing as well as analytical, microstructural and microanalytical examinations in the base metal, HAZ and weld metal with respect to the effects of reactor operatio and post-irradiation annealing as well as thermal treatment (475 C, 560 C). The analytical transmission electron microscopy (200 kV) revealed the alterations found in the mechanical properties to be due to the formation of black dots and irradiation-induced segregations and accumulations of copper and carbides. These effects, caused by operation, (neutron radiation, temperature), are much more significant in the HAZ than in the base metal. (orig./CB) [Deutsch] Im Rahmen des von der Europaeischen Union beauftragten Tacis `91/1.1 Programms `Reactor Vessel Embrittlement` wurden Bohrkerne aus dem hochbestrahlten Rundnahtbereich eines VVER-Reaktordruckbehaelters entnommen. Die kumulierte schnelle Neutronenfluenz in diesen Proben betraegt bis zu 6,5 x 10{sup 19} cm{sup -2} (E>0,5 MeV). In einer gemeinschaftlichen Untersuchung wurden mechanisch-technologische, chemische sowie mirkostrukturelle Untersuchungen an Grundwerkstoff-, WEZ- und Schweissgutproben im vergleichbaren Ausgangs-, bestrahlten und anschliessend waermebehandelten (475 C, 560 C) Werkstoffzustand durchgefuehrt. Die analytische Durchstrahlelektronenmikroskopie (200 kV) laesst als Ursache fuer die festgestellten Veraenderungen der mechanischen Eigenschaften die Bildung von Versetzungsringen (black dots) sowie von bestrahlungsinduzierten Ausscheidungen und Anreicherungen von Kupfer in den Karbiden erkennen. Diese Effekte, als Folge der betrieblichen Beanspruchung (Neutronenstrahlung, Temperatur) entstanden, treten in der WEZ deutlicher in Erscheinung als im Grundwerkstoff. (orig.)}
doi = {10.1016/S0029-5493(99)00192-2}
issue = {3}
volume = {193}
place = {Germany}
year = {1998}
month = {Nov}
}