Pressure Vessel Investigations of the Former Greifswald NPP: Fluence Calculations and Niobium Based Fluence Measurements
- Forschungszentrum Dresden-Rossendorf e.V. Bautzner Landstrasse 128, P.O. Box 510119, 01314 Dresden (Germany)
- VKTA, Bautzner Landstrasse 128 (B6), D-01328 Dresden (Germany)
Pressure vessel integrity assessment after long-term service irradiation is commonly based on surveillance program results. Nevertheless, only the investigation of RPV material from decommissioned NPPs enables the evaluation of the real toughness response. Such a chance is given now through the investigation of material from the former Greifswald NPP (VVER-440/230) to evaluate the material state of a standard RPV design and to assess the quality of prediction rules and assessment tools. The operation of the four Greifswald units was finished in 1991 after 12--15 years of operation. In autumn 2005 the first trepans (diameter 120 mm) were gained from the unit 1 of this NPP. Some details of the trepanning procedure will be given. The paper mainly deals with the retrospective dosimetry based on Niobium, which is a trace element of the RPV material. The reaction {sup 93}Nb(n,n'){sup 93m}Nb with an energy dependence highly correlated to radiation damage and a half life of the reaction product of 16.13 years is well suited for retrospective fast neutron dosimetry. Fluence calculations using the code TRAMO were based on pin-wise time dependent neutron sources and an updated nuclear data base (ENDF/B-VI release 8). The neutron spectra were determined at the trepan positions. The different loading schemes of unit 1 (standard and with 4 or 6 dummy assemblies) were taken into account. The calculated specific {sup 93m}Nb activities for February, 2006 at the sample positions were determined to 16.3 Bq/{mu}g Nb for sample 1, (0.1 cm distance from inner wall), and 4.0 Bq/{mu}g Nb for sample 2 (11.5 cm distance from inner wall). Unfortunately, a second neutron reaction besides {sup 93}Nb(n,n') leading to {sup 93m}Nb-activity is the reaction {sup 92}Mo(n,{gamma}){sup 93}Mo. {sup 93}Mo decays by electron capture to {sup 93m}Nb with a half life of 4000 years and a branching ratio b{sub r} = 0.88. As (n,{gamma})-reactions are produced mainly by low energy neutrons, being less important for material damage, the {sup 93m}Nb-activity generated through the Mo-path should be determined separately and subtracted from the measured activity. For the sample 1 in the maximum flux azimuthal position of weld SN4 with a Nb-content of 8 ppm and an Mo-content of 4000 ppm for February 3, 2006 was obtained a Mo-induced {sup 93m}Nb-activity of 80 Bq/g steel, amounting to 37.7% of the total {sup 93m}Nb-activity. It turns out that the {sup 93m}Nb generation on the second path is nearly of the same order as the fast neutron induced generation from Niobium. For the experimental determination of the {sup 93m}Nb-activity the Nb-content was determined by ICP-MS (inductive coupled plasma mass spectrometry) after dissolution of the material sample. The radiochemical isolation of Nb was done by anion exchange separation. The radiochemical separation was accompanied by determination of the chemical yield of Nb using again the ICP-MS method. The measurement of the {sup 93m}Nb activity was realized by Liquid Scintillation Spectrometry (LSC). The first comparison between the calculated and the measured {sup 93m}Nb activities resulted in deviations between 15 and 50%. Possible reasons for the observed differences are discussed. (authors)
- Research Organization:
- The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)
- OSTI ID:
- 20995443
- Resource Relation:
- Conference: 14. international conference on nuclear engineering (ICONE 14), Miami, FL (United States), 17-20 Jul 2006; Other Information: Country of input: France
- Country of Publication:
- United States
- Language:
- English
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