Progress of Landside Impermeable Wall freezing: Phase 2 of the first stage

Transcription

1 <Reference> June 30, 2016 Tokyo Electric Power Company Holdings, Inc. Progress of Landside Impermeable Wall : Phase 2 of the first stage The purpose of the Landside Impermeable Wall construction lies not in soil to form an underground wall but in keeping groundwater from flowing into the reactor/turbine buildings and preventing new contaminated water from being generated. By closing less than 95 percent of the mountain side of the Landside Impermeable Wall in Phase 2 of the first stage, it is expected that the amount of groundwater flowing into the areas around the reactor/turbine buildings will be reduced. This will help keep groundwater from being contaminated during the first stage. Throughout the first stage, how of the Landside Impermeable Wall has progressed will be checked by monitoring the difference in groundwater levels inside and outside of the wall and the amount of groundwater pumped up by the subdrain and groundwater drain systems and the well point system.

2 Changes in soil temperatures over time Note Average Soil Temperature (AST) of medium-grained sandstone layer (blue line): average value of thermometer temperatures measured at 1m intervals except for the areas between ground surface and Ground Level 2m and the areas around the first muddy layer boarder. Average Soil Temperature (AST) of alternating strata layer (red line): Average value of thermometer temperatures measured at 1m intervals except for the areas around the upper and lower parts of the alternating layer boarder. 1

3 Groundwater levels and hydraulic heads (in the medium-grained sandstone layer 1 on the seaside) 1. Landside Impermeable Wall (groundwater levels around the seaside and the operations of Subdrain pumping system) The wells for the medium-grained sandstone layer are grouped together to show the difference in water levels close to each Unit, except for non- areas (the bottom of Unit 4 seawater piping trench). RW (Water injection well) Ci, Co (Observation well) Groundwater level The lowest level (from Dec.1, 2015 to Mar. 14, 2016) + more than 1m The lowest level (from Dec.1, 2015 to Mar. 14, 2016) + more than 0.5m Over the lowest level (from Dec.1, 2015 to Mar. 14, 2016) Less than the lowest level (from Dec.1, 2015 to Mar. 14, 2016) 2. Groundwater levels inside and outside of the Landside Impermeable Wall 地下水位は6/28 12:00 時点のデータ The data of groundwater levels as of 12 p.m. on June 28. 2

4 Groundwater levels and hydraulic heads (in the medium-grained sandstone layer 2 on the landside) 3. Landside Impermeable Wall (groundwater levels around the seaside and the operations of Subdrain pumping system) The wells for the medium-grained sandstone layer are grouped together to include two wells outside the non- area and one well inside, for each Unit. RW (Water injection well) Ci, Co (Medium-grained sandstone layer) Groundwater level Landside Subdrain the lowest level + more than 2m Landside Subdrain the lowest level + more than 1m Landside Subdrain over the lowest level Landside Subdrain less than the lowest level 4. Groundwater levels inside and outside of the Landside Impermeable Wall 地下水位は6/28 12:00 時点のデータ The data of groundwater levels as of 12 p.m. on June 28. 3

5 Groundwater levels and hydraulic heads (in the alternating strata layer and the fine- and rough-grained sandstone layer 1 on the seaside) 5. Landside Impermeable Wall (groundwater levels around the seaside and the operations of Subdrain pumping system) The wells for the alternating strata layer and the fine- and rough-grained sandstone layer are grouped together to show the difference in water levels close to each Unit, except for non- areas (the bottom of seawater piping trench for each Unit). Gi, Go (Alternating strata layer) Si, So (fine-and rough-grained sandstone layer) Groundwater level The lowest level (from Apr. 1 to Apr. 11, 2016) + more than 1m The lowest level (from Apr. 1 to Apr. 11, 2016) + more than 0.5m Over the lowest level (from Apr. 1 to Apr. 11, 2016) Less than the lowest level (from Apr. 1 to Apr. 11, 2016) 6. Groundwater levels inside and outside of the Landside Impermeable Wall 地下水位は6/28 12:00 時点のデータ The data of groundwater levels as of 12 p.m. on June 28. 4

6 Groundwater levels and hydraulic heads (in the alternating strata layer and the fine- and rough-grained sandstone layer 2 on the landside) 7. Landside Impermeable Wall (groundwater levels around the seaside and the operations of Subdrain pumping system) The wells for the alternating strata layer and the fine- and rough-grained sandstone layer are grouped together to include two wells outside the non- area and one well inside, for each Unit. Gi, Go (Alternating strata layer) Si, So (fine-and rough-grained sandstone layer) Groundwater level Landside Subdrain the lowest level + more than 2m Landside Subdrain the lowest level + more than 1m Landside Subdrain over the lowest level Landside Subdrain less than the lowest level 8. Groundwater levels inside and outside of the Landside Impermeable Wall 地下水位は6/28 12:00 時点のデータ The data of groundwater levels as of 12 p.m. on June 28. 5

7 [Reference] Location map of groundwater level observation wells (as of April 2016) Groundwater drain and Subdrain Water injection well Observation well located in the medium-grained sandstone layer Observation well located in the alternating strata layer Observation well located in the fine-and rough-grained sandstone layer 6

8 [Reference] Distribution map of soil temperatures (north side of Unit1) Distribution map of soil temperatures : Thermometer pipe for the outside of frozen soil line : Thermometer pipe for the inside of frozen soil line : RE (recharge well) : Ci (medium-grained sandstone layer in the inside of frozen soil line) (6) Seaside of Seaside (East) (5) Seaside of Frozen soil line North side of Unit 1 (a view from the north side) ((The 温 temperature 度は6/28 data as of 7 時 a.m. 点 on のデータ) June 28.) : Diagonally installed thermometer pipe for the soil pipes installed on multiple line : Thermometer pipe for no areas : Corner of frozen soil line : Soil pipes installed on single line (advanced ) : Soil pipes installed on multiple lines (advanced ) : Freezing areas for the seaside and a part of the north side (1) North side of Unit 1 Unit 1 T/B Unit 2 T/B Unit 3 T/B Unit 4 T/B Unit 1 Unit 2 Unit 3 Unit 4 South (4) South side of Unit 4 No, W.2 No, W.3 No W.4 No, S. No, N. East No, W.1 (2) Landside of Landside (West) No, W.5 (3) Landside of *The red arrow indicates the direction from which the ICE WALL is looked at. Temperature ( C) West (leading to the landside of Units 1-2 (2)) *No measurement: white 7

9 [Reference] Distribution map of soil temperatures (west side of Units 1-2) Distribution map of soil temperatures : Thermometer pipe for the outside of frozen soil line : Thermometer pipe for the inside of frozen soil line : RE (recharge well) : Ci (medium-grained sandstone layer in the inside of frozen soil line) (6) Seaside of Seaside (East) (5) Seaside of Frozen soil line Landside of Units 1-2 (a view from the west side) (The temperature data as of 7 a.m. on June 28.) ( 温度は6/28 は6/21 時点のデータ) : Diagonally installed thermometer pipe for the soil pipes installed on multiple line : Thermometer pipe for no areas : Corner of frozen soil line : Soil pipes installed on single line (advanced ) : Soil pipes installed on multiple lines (advanced ) : Freezing areas for the seaside and a part of the north side North (1) North side of Unit 1 Unit 1 T/B Unit 2 T/B Unit 3 T/B Unit 4 T/B Unit 1 Unit 2 Unit 3 Unit 4 South (4) South side of Unit 4 No, W.2 No, W.3 No W.4 No, S. No, N. North (leading to the north side of Unit 1 (1)) No, W.1 No, W.5 (2) Landside of (3) Landside of Landside (West) *The red arrow indicates the direction from which the ICE WALL is looked at. Temperature ( C) South (leading to the landside of Units 3-4 (3)) *No measurement: white 8

10 [Reference] Distribution map of soil temperatures (west side of Units 3-4) Distribution map of soil temperatures : Thermometer pipe for the outside of frozen soil line : Thermometer pipe for the inside of frozen soil line : RE (recharge well) : Ci (medium-grained sandstone layer in the inside of frozen soil line) (6) Seaside of Seaside (East) (5) Seaside of Frozen soil line Landside of Units 3-4 (a view from the west side) ( 温度は6/28 は6/21 時点のデータ) (The temperature data as of 7 a.m. on June 28.) : Diagonally installed thermometer pipe for the soil pipes installed on multiple line : Thermometer pipe for no areas : Corner of frozen soil line : Soil pipes installed on single line (advanced ) : Soil pipes installed on multiple lines (advanced ) : Freezing areas for the seaside and a part of the north side North (1) North side of Unit 1 Unit 1 T/B Unit 2 T/B Unit 3 T/B Unit 4 T/B Unit 1 Unit 2 Unit 3 Unit 4 South (4) South side of Unit 4 No, W.2 No, W.3 No W.4 No, S. No, N. North (leading to the landside of Units 1-2 (2)) No, W.1 (2) Landside of (3) Landside of No, W.5 Landside (West) *The red arrow indicates the direction from which the ICE WALL is looked at. Temperature ( C) South (leading to the south side of Unit 4 (4)) *No measurement: white 9

11 [Reference] Distribution map of soil temperatures (south side of Unit 4) Distribution map of soil temperatures South side of Unit 4 (a view from the south side) (The temperature data as of 7 a.m. on June 28.) ( 温度は6/28 は6/21 時点のデータ) : Thermometer pipe for the outside of frozen soil line : Thermometer pipe for the inside of frozen soil line : Diagonally installed thermometer pipe for the soil pipes installed on multiple line : Thermometer pipe for no areas : Corner of frozen soil line : RE (recharge well) : Ci (medium-grained sandstone layer in the inside of frozen soil line) : Soil pipes installed on single line (advanced ) : Soil pipes installed on multiple lines (advanced ) : Freezing areas for the seaside and a part of the north side North (1) North side of Unit 1 Seaside (East) (6) Seaside of (5) Seaside of Unit 1 T/B Unit 2 T/B Unit 3 T/B Unit 4 T/B Unit 1 Unit 2 Unit 3 Unit 4 Frozen soil line (4) South side of Unit 4 No, W.2 No, W.3 No W.4 No, S. No, N. West (leading to the landside of Units 3-4 (3)) No, W.1 (2) Landside of Landside (West) No, W.5 (3) Landside of *The red arrow indicates the direction from which the ICE WALL is looked at. Temperature ( C) East (leading to the seaside of Units 3-4 (5)) East *No measurement: white 10

12 [Reference] Distribution map of soil temperatures (east side of Units 3-4) Distribution map of soil temperatures Seaside of Units 3-4 (west side: a view from the inside of frozen soil) (The temperature data as of 7 a.m. on June 28.) ( 温度は6/28 時点のデータ) : Thermometer pipe for the outside of frozen soil line : Thermometer pipe for the inside of frozen soil line : Diagonally installed thermometer pipe for the soil pipes installed on multiple line : Thermometer pipe for no areas : Corner of frozen soil line : RE (recharge well) : Ci (medium-grained sandstone layer in the inside of frozen soil line) : Soil pipes installed on single line (advanced ) : Soil pipes installed on multiple lines (advanced ) : Freezing areas for the seaside and a part of the north side North (1) North side of Unit 1 Seaside (East) (6) Seaside of (5) Seaside of Unit 1 T/B Unit 2 T/B Unit 3 T/B Unit 4 T/B Unit 1 Unit 2 Unit 3 Unit 4 Frozen soil line South (4) South side of Unit 4 No, W.2 No, W.3 No W.4 No, S. No, N. North (leading to the seaside of Units 1-2 (6)) No, W.1 (2) Landside of Landside (West) No, W.5 (3) Landside of *The red arrow indicates the direction from which the ICE WALL is looked at. Temperature ( C) South (leading to the south side of Unit 4 (4)) *No measurement: white 11

13 [Reference] Distribution map of soil temperature (east side of Units 1-2) Distribution map of soil temperatures Seaside of Units 1-2 (west side: a view from the inside of frozen soil) (The temperature data as of 7 a.m. on June 28.) ( 温度は6/28 は6/21 時点のデータ) : Thermometer pipe for the outside of frozen soil line : Thermometer pipe for the inside of frozen soil line : Diagonally installed thermometer pipe for the soil pipes installed on multiple line : Thermometer pipe for no areas : Corner of frozen soil line : RE (recharge well) : Ci (medium-grained sandstone layer in the inside of frozen soil line) : Soil pipes installed on single line (advanced ) : Soil pipes installed on multiple lines (advanced ) : Freezing areas for the seaside and a part of the north side North (1) North side of Unit 1 Seaside (East) (6) Seaside of (5) Seaside of Unit 1 T/B Unit 2 T/B Unit 3 T/B Unit 4 T/B Unit 1 Unit 2 Unit 3 Unit 4 Frozen soil line South (4) South side of Unit 4 No, W.2 No, W.3 No W.4 No, S. No, N. North (leading to the north side of Unit 1 (1)) No, W.1 (2) Landside of Landside (West) No, W.5 (3) Landside of *The red arrow indicates the direction from which the ICE WALL is looked at. Temperature ( C) South (leading to the seaside of Units 3-4 (5)) *No measurement: white 12

14 [Reference] Changes in the water levels of the vertical shaft B of Unit 1 seawater piping trench and the amounts of water transferred T.P.(m) 5.00 トレンチ坑 B 位 & 移送量 Water levels of the vertical shaft B and amounts of water transferred T.P. ペントハウス m 天端さ(T.P m) top end of Penthouse 移送量 (m3) Transferred Amount (m3) Expected water levels 16.0 翌日 after 以降の tomorrow 予想水位 4.50 T.P m top end of Penthouse T.P m above 坑坑 the さ(T.P m) sea level (ground level) *Water transfer has been suspended from June 12 due to the completion of water-proof coating inside the Penthouse /1 6/2 6/3 6/4 6/5 6/6 6/7 6/8 6/9 6/10 6/11 6/12 6/13 6/14 6/15 6/16 6/17 6/18 6/19 6/20 6/21 6/22 6/23 6/24 6/25 6/26 6/27 6/28 6/29 6/30 7/1 7/2 7/3 7/4 Amount of water Amount of water 予移測 transferred 送水量位 ( 1( 実績至 ) 近 (m3) 流入量最高値 18.89m3で想定 ) 予移測 that 送水量位 will ( 2( 予想 be 至 ) 近流入量最低値 15.22m3で想定 ) 予立測 vertical 坑水位 1( ( 予 shaft 至想近 ) 流入量最高値 18.89m3で想定 ) 予立測坑 vertical 水位 2( ( 実 shaft 至績近 ) 流入量最低値 15.22m3で想定 ) transferred (m3) Water level at (expected) Water level at (results) 0.0 6/28 作成データ *Data generated at 3 p.m. on May