b'Integral Irradiation Tests on the ATR Pressurized Water Loop (ATF-2)Principal Investigator: David Kamerman & Fabiola CappiaThe irradiation testingT he Idaho National Laboratoryconfigured with larger boiling water (INL) Accident Tolerant Fuelreactor (BWR) sized fuel pins. This and post-irradiation(ATF)-2 irradiation testing andarrangement allows for disassembly examination ofpost-irradiation examination (PIE)of the test train in the ATR canal ATF allows for theprogram is focused on conductingso that individual test pins can be generation of dataprototypic irradiations of new lightremoved at various time in their necessary to license water reactor fuel designs withirradiation life and be replaced the new fuel designsenhanced accident tolerance. Thewith new fresh pins. The entire for use in commercialirradiated test pins are then shippeddesign is modular allowing for large operating reactors. to INL hotcells for non-destructivereconfigurable test matrixes.and destructive testing where dataA total of three shipments of needed to license the fuel designsirradiated test pins has been made for operation in commercial powerfrom the ATR canal to the Hot Fuel reactors is generated. Examination Facility (HFEF) hotcell Project Description: for PIE. PIE of the ATF test pins has The ATF-2 test train consists ofconsisted of non-destructive, fission 6 tiers each of which contains agas puncturing and destructive 2x3 array of test pins which areexaminations. The non-destructive nominally 15cm in length andexaminations included visual contain 10 fuel pellets. At variousinspection, profilometry, neutron times two of the tiers are combinedradiography and gamma scanning. so that longer test pins with up toThe destructive examinations were 20 fuel pellets can be irradiated.focused on cladding performance, in Loop-2A supplies the pressurizedparticular mechanical testing.water coolant to the ATF-2 test trainAccomplishments:via an annular in-pile tube comingThe ATF-2 test has completed 7 in from the bottom of the Advancedcycles of irradiation in Loop 2A Test Reactor (ATR) pressure vessel.under prototypic PWR conditions. The system is complete with aForty-one test pins have been pressurizer, heat exchangers, lineirradiated to date under the program heaters, pumps as well as a feed andreaching a maximum exposure of bleed secondary coolant circuit for30 MWd/kgU. The test pins have chemistry control. The flow areacome from each of the three U.S. in the tiers when configured withfuel vendors who are conducting standard 17x17 pressurized waterDepartment of Energy (DOE) funded reactor (PWR) sized fuel pins isresearch and development (R&D) ~2.677 cm2 and ~2.509 cm2 when 26 2021|AFC ACCOMPLISHMENTS'