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- W96830182 abstract "The US Department of Energy (DOE) and the US Nuclear Regulatory Commission (NRC) are supporting work at Sandia National Laboratories (SNL) and Argonne National Laboratory (ANL), respectively, to obtain disc samples from the Shippingport Station neutron shield tank (NST) and characterize the low-temperature ( 1MeV) neutron embrittlement of reactor pressure vessel (RPV) support structures. Pacific Northwest Laboratory (PNL), funded jointly by DOE and NRC, developed and demonstrated the sampling technology. A total of eleven six-inch diameter discs have been removed from the one-inch thick NST inner wall representing base-metal and weld-metal at three fluence levels. Sample preparation and preliminary analysis will be performed by ANL, SNL, and PNL. The sample evaluation plan, developed by ANL and SNL, involves initial composition analysis and neutron exposure level determination of each disc followed by a representative Charpy V-notch test to indicate the extent of embrittlement. The preliminary Charpy results support the decision for a more extensive testing program. Embrittlement of the NST from the low-flux, low-temperature environment has been indicated by an increase in the nil-ductility transition temperature and a decrease in the upper shelf energy as compared to similar material radiated inmore » the High Flux Isotope Reactor (HFIR) under comparable conditions. 7 refs., 2 figs., 3 tabs.« less" @default.
- W96830182 created "2016-06-24" @default.
- W96830182 creator A5049696829 @default.
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- W96830182 date "1988-01-01" @default.
- W96830182 modified "2023-09-27" @default.
- W96830182 title "Shippingport neutron shield tank sampling and analysis program" @default.
- W96830182 hasPublicationYear "1988" @default.
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