[2D13-17] Critical Experiment Facility

3:50 PM - 4:05 PM JST(6:50 AM - 7:05 AM UTC)

[2D14] Modification of STACY for the study of criticality characteristics of fuel debris(16) Pre-service inspections for the restart of STACY

*Kenta Hasegawa¹, Yu Arakaki¹, Takahiko Murakami¹, Masato Sumiya¹, Eiju Aizawa¹, Masakazu Seki¹, Junichi ishii¹, Shouhei Araki¹, Kazuhiko Izawa¹, Satoshi Gunji¹ (1. JAEA)

Keywords:

modified STACY,Fukushima Dai-ichi NPP,Critical Experiment,Fuel Debris,a series of pre-service inspections

In order to experimentally clarify the criticality characteristics of fuel debris at the Fukushima Daiichi Nuclear Power Plant, the Static Experiment Critical Facility (STACY), which has been used for experiments on the criticality safety of solution fuel, was replaced with a general-purpose heterogeneous thermal core consisting of fuel rods and light water, and operation is scheduled to restart around August 2024 after 13 years and 9 months.
Since the first criticality on April 22, 2024, pre-service inspection necessary for the restart of STACY operation have been carried out in accordance with the new regulatory standards and the new inspection system. Among the pre-service inspections, this report describes the reactivity inspection, reactor shutdown margin inspection, and reactivity inspection of sample driver.