The numbers of foam injections performed to date are as follows:
YETS 21/22 = 100 Boxes
YETS 22/23 = 277 Boxes
YETS 23/24 = 224 Boxes
During the foam injections performed in YETS 21/22, the foam was applied to only 2 of the 4 corners of the chambers.
In YETS 22/23, the four corners (4 corners of 1 dz) of 58 layers (30 DZ) and the eight corners (8 corners of 2 dz) of 40 layers (20 DZ) were covered with foam. Only one possible leakage was detected in one layer of one DZ through DCS. The mentioned layer has foam applied to all four corners, and the leakage might have originated from the other DZ.
In YETS 23/24, the four corners of 46 layers (23 DZ) and the eight corners of 24 layers (12 DZ) were covered with foam. Two of the layers with foam applied to all four corners had leakage, which may have originated from the other DZ.
The data mentioned here are those of the chambers with 4 or 8 corners covered with foam that we can control through DCS. Besides these, the results of the chambers we repaired on 1, 2, or 3 corners when calculated based on the manometer tests from the past YETS, are 99%, as I presented during YETS.
