Published 1998 | Version v1
Miscellaneous Restricted

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 ∼ 0, 15 C-2,5 Cr-0, 7Mo-0,3 V

Creators

  • 1. Siemens AG Energieerzeugung KWU, Erlangen (Germany)
  • 2. Russian Research Centre Kurchatov Inst., Moscow (Russian Federation)

Description

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 1019 cm-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 operation 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)

Abstract (German)

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 1019 cm-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.)

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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

Additional details

Additional titles

Original title (German)
Veraenderungen der Mikrostruktur in Grundwerkstoff, WEZ und Schweissgut eines 440-VVER-Reaktordruckbehaelters, verursacht durch Neutronenbestrahlung im langzeitigen Betrieb; Werkstoff: 15 Ch2MFA ∼ 0,15 C-2,5 Cr-0, 7Mo-0,3 V

Publishing Information

Imprint Title
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
Imprint Pagination
431 p.
Journal Page Range
p. 34.1-34.19
Report number
INIS-DE--0022

Conference

Title
Safety and reliability of plant technology with special emphasis on nuclear technology - behaviour of pressurized components and systems at increased loading
Original Conference Title
23. MPA-Seminar: Sicherheit und Verfuegbarkeit in der Anlagentechnik mit dem Schwerpunkt Kerntechnik - Verhalten von druckfuehrenden Komponenten und Systemen bei erhoehten Belastungen
Acronym
23. MPA seminar
Dates
1-2 Oct 1997
Place
Stuttgart (Germany)

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
29058474
Subject category
S36: MATERIALS SCIENCE; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Conference
Descriptors DEI
FILLER METALS; HEAT AFFECTED ZONE; IRRADIATION; MICROSTRUCTURE; NEUTRONS; PRESSURE VESSELS; STEEL-CR2MOV; WELDED JOINTS; WWER TYPE REACTORS
Descriptors DEC
ALLOYS; BARYONS; CARBON ADDITIONS; CHROMIUM ALLOYS; CONTAINERS; COPPER ADDITIONS; CRYSTAL STRUCTURE; ELEMENTARY PARTICLES; ENRICHED URANIUM REACTORS; FERMIONS; HADRONS; IRON ALLOYS; IRON BASE ALLOYS; JOINTS; LOW ALLOY STEELS; MOLYBDENUM ADDITIONS; NICKEL ADDITIONS; NUCLEONS; POWER REACTORS; PWR TYPE REACTORS; REACTORS; STEELS; THERMAL REACTORS; TRANSITION ELEMENT ALLOYS; VANADIUM ADDITIONS; WATER COOLED REACTORS; WATER MODERATED REACTORS

Optional Information

Notes
Imprint: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