April 23, 2018 Tokyo Electric Power Company Holdings, Inc.

Transcription

1 Situation of and Treatment of ccumulated Water including Highly Radioactive Materials at Fukushima Daiichi Nuclear Power Station (5th Release) pril, 8 Tokyo Electric Power Company Holdings, Inc.. Introduction This document is to report the following matters in accordance with the instruction of Installment of and storing facility of water including highly concentrated radioactive materials at Fukushima Daiichi Nuclear Power Station of the Tokyo Electric Power Company (Instruction) (NIS No. 6, June 8, ), dated on June 9,. <Instruction> TEPCO should report to NIS the situation of storing and treatment of the contaminated water in the Power Station and the future forecast based upon the current situation has to be reported to NIS as soon as the starts its operation. lso, subsequently, continued report has to be submitted to NIS once a week until the treatment of the accumulated water in the Central Radioactive Waste Treatment Facility is completed.. Situation of storing and treatment of accumulated water in the building (actual record) Stored amounts in each unit building (Units to 4 (including condensers and trenches)) and stored and treated amounts, and other related data in the ccumulated Water Storing Facility as of pril 9, 8, are shown in the ttachment -.. Forecast of storing and treatment () Short term forecast Water transfer is planned so that the levels of the accumulated water in Units and and Units and 4 building will be maintained around at the level of TP.,564, based on the stored amount in the ccumulated Water Storing Facilities and the operating situation of the radioactive material treatment equipment. Water is transferred to the Process Main Building andor High Temperature Incinerator Building as ccumulated Water Storing Facilities. Treatment is implemented considering the state of storage and transfer of ccumulated Water Storing Facilities. We assume stored amounts in each unit building (Units to 4 (including condenser and trench)), and stored and treated amounts, and other related data in the ccumulated Water Storing

2 Facilities as of pril 6, 8 and May, 8, are shown in ttachment -. () Middle term forecast Regarding accumulated water in Units and buildings and Units and 4 buildings, from the viewpoint of reducing the risks of discharging to the ocean and leaking into the groundwater, it is necessary to keep enough capacity for the accumulated water in the building until its level reaches TP.,564 and to keep the accumulated water level lower than the groundwater level. On the other hand, based on the view of limiting inflow of underwater to buildings and reducing the amount of emerged accumulated water, we are planning to transfer accumulated water keeping its level in the building around TP.,564 considering water tank capacity. s for accumulated water of the Process Main Building and the High Temperature Incinerator Building, we are planning to treat the accumulated water considering the situation of construction of middle and low level waste water tanks, the operation factor of the radioactive material treatment instruments and duration for maintenance. We forecast stored amounts in each unit building (Units to 4 (including condensers and trenches)), and storing and treatment situations in the ccumulated Water Storing Facilities for the next months, as shown in ttachment -. Stored amounts in each building and the water storage equipment are forecasted to be unchanged in case transfer and treatment were implemented as scheduled without rain. However, it would be subject to change depending on the operation factor of the radioactive material treatment instruments and so on. lso, the water treated at the radioactive material treatment equipment (fresh water and condensed salt water) can be stored in the middle and low level waste water tanks. END

3 and treatment of high level radioactive accumulated water (as of pril 9, 8) Volume of water to be injected last to Reactor (4-49) report Filtrate water - - Treated water (freshwater),45m -m Cumulative treated water 859,78m Reactor building Classification ttachment- High level radioactive water Waste, waste liquid *, capacity *,4 Treated water (saltwater) receiving tank* m - - Strontium-treated Treated water (concentrated saltwater), pipe removal Freshwater receiving tank water 6,7m -556m,6m waste Multi-nuclide Removal Treated water liquid storage tank 9,5m 4 No Change,7m Treated water (freshwater), pipe removal Treated water storage tank Treated water Equipment () 868,496m +,96m 96,9m Treated water from Multi-nuclide Removal Facility To storage tank 8,5m -,596m,9m Freshwater Reactor Pressure Vessel Primary Containment Vessel Unit : 67m day,fdw CS Unit : 7m day,cs Unit : 67m day,fdw CS Filtrate Tank Water injection tank (CST) (Buffer tank) Turbine building waste liquid Condenser Evaporative concentration apparatus Reverse osmosis treated water (Freshwater) Reverse osmosis circulation facility inside (High temperature incinerator building) Centralized radioactive waste (Process main building) Desalination plant (Reverse osmosis) supply tank SPT(B) Treatment facility (Cesium adsorption apparatus) (nd Cesium adsorption apparatus) (Decontamination facility) Waste Residual water capacity*,4 saltwater tank pprox. 6m No Change pprox. 5,m * supply tank 749m +9m,m SPT(B),4m -m,m Chloride concentration Beforefter Desalination ppm<ppm (Sampled on March ) Beforefter Reverse Osmosis Circulation 5ppm<ppm (Sampled on March 9) Beforefter Evaporative Concentration - Place of Sampling Radioactivity concentration *6 Process Main Building.E+8 BqL (Sampled on February ) Exit of cesium adsorption apparatus 8.9E+ BqL (Sampled on February ) Exit of decontamination facility High Temperature Incinerator Building.E+8 BqL (Sampled on pril ) Exit of second cesium adsorption apparatus.e+ BqL (Sampled on pril ) From - Facility Water level in TB * 8 facility T.P.,99 Unit pprox. 4,m -m * Process Main Building pprox. 6,4m +4m T.P. 8 T.P. 99 Unit pprox. 9,55m No Change High Temperature Incinerator Building pprox.,84m +54m Water level Treated * 8 (4-49) pprox.,6m *7 Cumulative treated pprox.,95,7m *7 Waste produced capacity Sludge 597m No Change 7m * Used vessels,968 *9 + 6,68 T.P. 66 Unit pprox.,8m +7m Total pprox. 8,88m Unit 4 pprox.,7m +7m Total pprox. 6,8m T.P. 49 [Main operations that have been conducted during the period from November pril, 8 4, 6 (the previous (the previous announcement announcement data) data) to pril to 9, December 8.], 6] - Water transfer from the Units -4 Reactor the Building buildings to (Units the High -4, Temperature Centralized Incinerator radioactive Building waste treatment and the Process facility) and Main to Building the teatment was conducted facility was whenever conducted necessary. whenever necessary. -Water Due to transfer other work, from water the Unit transfer Turbine to the Building buildings to (Units the High -4, Temperature Centralized Incinerator radioactive Building waste treatment and the Process facility) was Main conducted Building was whenever conducted necessary. whenever necessary. -Water Operations transfer of the from Cesium the Unit dsorption Radioactive pparatus Waste has Treatment been suspended. Facility to the Process Main Building was conducted whenever necessary. -Water On pril transfer, operations from the Unit of the Turbine nd Cesium Building dsorption to the High pparatus Temperature have been Incinerator resumed; Building the availability and the Process factor is Main 6% Building (previously wassimulated: conducted %). whenever necessary. -Water On pril transfer 6, operations from the Unit of the Radioactive nd Cesium Waste dsorption Treatment pparatus Facility was to suspended. the Process Main Building was conducted whenever necessary. -On November capacity, of water Strontium-treated transfer from the water Unit was Turbine changed Building as operations to the Unit of the Radioactive tanks finished. Waste Treatment Facility was conducted. - From November, operations of the Cesium dsorption pparatus has been suspended. - Operations of the nd Cesium dsorption pparatus have been conducted; the availability factor is 49% (previously simulated: 55%). - Due to other work, water transfer to the buildings (Units -4, the Process Main Building, the High Temperature Incinerator Building) was conducted whenever necessary. * The figures of the data are treated as a reference, because water levels during water transfer are not stable. * The figures of the storage do not include those of the following s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %: Freshwater receiving tank (approx. 9m ), waste liquid storage tank (approx.m ), Treated water storage tank (approx.,6m ), storage tank (approx. 4,m ). * The figures of the data show the operational limits. *4 The figures of " capacity" do not include those of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. However, each tank has the capacity that accomodates more than the storage that accumulates up to the height of "DS." The figure of "Residual water" includes the one of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. The amount of the residual water of concentrated saltwater is calculated based on that of the water treated through the LPS and other facilities. *6 The data shown here are those of Cs-7. *7 Total treated amount of Cesium adsorption apparatus and nd Cesium adsorption apparatus (mount of under trial operation included.) Breakdown of the treated amount: Cesium adsorption apparatus (m ) nd Cesium adsorption apparatus (,6m ) Breakdown of the cumulative treated amount: Cesium adsorption apparatus (8,64m ) nd Cesium adsorption apparatus (,5,5m ) *8 The data of the water levels in the Reactor Buildings are the data as of 7 a.m., pril 9. *9 Breakdown of the used vessels: Cesium adsorption apparatus (767), nd Cesium adsorption apparatus (98) Others: container (,78), Treated column (), Used vessel (9), Filiters and so forth (65) * Diminution of the Unit trenches. (pprox. 4m )

4 and treatment of high level radioactive accumulated water (as of pril 6, 8) ttachment- () last Volume of water to be injected to Reactor (49-46) report Filtrate water - - Treated water (freshwater),5m +6m Cumulative treated water 86,69m Classification High level radioactive waterwaste, waste liquid Treated water (saltwater) Strontium-treated Treated water (concentrated saltwater) Removal of piping water * capacity *, Multi-nuclide Removal Treated water receiving tank* m - - Treated water Equipment () Treated water (freshwater) Removal of piping To Freshwater receiving tank 6,75m -6m,6m waste Treated water from Multi-nuclide Removal Equipment liquid storage tank 9,5m No Change,7m Freshwater Treated water storage tank*4 87,46m +,9m 9,m Filtrate Desalination plant storage tank 8,8m -,654m,9m Tank (Reverse osmosis) Reactor building Unit : 7m day,fdw CS Unit : 7m day,cs Unit : 7m day,fdw CS Water injection tank (CST) (Buffer tank) waste liquid Evaporative concentration apparatus Reverse osmosis treated water (Freshwater) Reverse osmosis circulation facility inside buildings supply tank Residual water *4 capacity*, pprox.6m No Change pprox. 5,m receiving tank Turbine building (High temperature incinerator building) SPT(B) Reactor Pressure Vessel Primary Containment Vessel Condenser (Process main building) Treatment facility (Cesium adsorption apparatus) (nd Cesium adsorption apparatus) (Decontamination facility) Waste From Facility Unit pprox. 9,57m +m Water level in Facility TB Water level T.P. 99 T.P., (Unit TB) T.P. 5 High Temperature Incinerator Building pprox.,86m +m Unit pprox. 4,m -m Process Main Building pprox. 6,5m Treated (49-46) Cumulative treated pprox.,97,69m Waste produced capacity +m pprox.,5m Sludge 597m No Change 7m * Used vessels,977 *6 +9 6,68 Unit pprox.,49m -m Unit 4 pprox.,68m -m Total pprox. 5,75m T.P. 65 (Unit TB) Total pprox. 9,m [Main operations that are planned to be conducted during the period from pril 9, 8 to pril 6, 8.] - Water transfer from the Units -4 to the buildings (Units -4, ) and to the teatment facility will be conducted whenever necessary. - Due to other work, water transfer to the buildings (Units -4, ) will be conducted whenever necessary. - Operations of the Cesium dsorption pparatus will continue to be suspended. - Operations of the nd Cesium dsorption pparatus will be resumed (assumed availability factor: %). - Operations of the nd Cesium dsorption pparatus will be suspended. - capacity of Treatedf water will be changed as operations of the tanks started. * The figures of " " do not include those of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. * The figures of the data show the operational limits. * The figures of " capacity" do not include those of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. However, each tank has the capacity that accomodates more than the storage that accumulates up to the height of "DS." *4 The figure of "Residual water" includes the one of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. The amount of the residual water of concentrated saltwater is calculated based on that of the water treated through the LPS and other facilities. Total treated amount of Cesium adsorption apparatus and nd Cesium adsorption apparatus Breakdown of the treated amount: Cesium adsorption apparatus (m ) nd Cesium adsorption apparatus (,5m ) Breakdown of the cumulative treated amount: Cesium adsorption apparatus (8,64m ) nd Cesium adsorption apparatus (,54,5m ) *6 Breakdown of the used vessels: Cesium adsorption apparatus (767) nd Cesium adsorption apparatus (98) Others: container (,77), Treated column (), Used vessels (9), Filters and so forth (65)

5 and treatment of high level radioactive accumulated water (as of May, 8) ttachment- () last Volume of water to be injected to Reactor (46-5) report Filtrate water - - (freshwater) Treated water,5m No Change Cumulative treated water 86,m Classification High level radioactive waterwaste, waste liquid Treated water (saltwater) Strontium-treated Treated water (concentrated saltwater) Removal of piping water * capacity *, Multi-nuclide Removal Treated water receiving tank* m - - Treated water Equipment () Treated water (freshwater) Removal of piping To Freshwater receiving tank 6,75m No Change,6m waste Treated water from Multi-nuclide Removal Equipment liquid storage tank 9,5m No Change,7m Freshwater Treated water storage tank*4 876,48m +4,75m 9,m Filtrate Desalination plant storage tank 8,8m -5m,9m Tank (Reverse osmosis) Reactor building Unit : 7m day,fdw CS Unit : 7m day,cs Unit : 7m day,fdw CS Water injection tank (CST) (Buffer tank) waste liquid Evaporative concentration apparatus Reverse osmosis treated water (Freshwater) Reverse osmosis circulation facility inside buildings supply tank Residual water *4 capacity*, pprox.6m No Change pprox. 5,m receiving tank Turbine building (High temperature incinerator building) SPT(B) Reactor Pressure Vessel Primary Containment Vessel Condenser (Process main building) Treatment facility (Cesium adsorption apparatus) (nd Cesium adsorption apparatus) (Decontamination facility) Waste From Facility Unit pprox. 9,57m No Change Water level in Facility TB Water level T.P. 99 T.P.,585 (Unit TB) T.P. 4 High Temperature Incinerator Building pprox.,89m +m Unit pprox. 4,m No Change Process Main Building pprox. 4,m Treated (46-5) Cumulative treated pprox.,9,7m Waste produced capacity -,m pprox. 5,4m Sludge 597m No Change 7m * Used vessels,986 *6 +9 6,68 Unit pprox.,8m +m Unit 4 pprox.,68m No Change Total pprox. 6,7m T.P. 6 (Unit TB) Total pprox. 6,9m [Main operations that are planned to be conducted during the period from pril 6, 8 to May, 8.] - Water transfer from the Units -4 to the buildings (Units -4, ) and to the teatment facility will be conducted whenever necessary. - Due to other work, water transfer to the buildings (Units -4, ) will be conducted whenever necessary. - Operations of the Cesium dsorption pparatus will continue to be suspended. - Operations of the nd Cesium dsorption pparatus will be resumed (assumed availability factor: 6%). * The figures of " " do not include those of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. * The figures of the data show the operational limits. * The figures of " capacity" do not include those of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. However, each tank has the capacity that accomodates more than the storage that accumulates up to the height of "DS." *4 The figure of "Residual water" includes the one of the s that have accumulated from the bottom of the tanks to the height of so-called "down scale (DS)," where water gauges show %. The amount of the residual water of concentrated saltwater is calculated based on that of the water treated through the LPS and other facilities. Total treated amount of Cesium adsorption apparatus and nd Cesium adsorption apparatus Breakdown of the treated amount: Cesium adsorption apparatus (m ) nd Cesium adsorption apparatus (5,4m ) Breakdown of the cumulative treated amount: Cesium adsorption apparatus (8,64m ) nd Cesium adsorption apparatus (,59,9m ) *6 Breakdown of the used vessels: Cesium adsorption apparatus (767) nd Cesium adsorption apparatus (98) Others: container (,76), Treated column (), Used vessels (9), Filters and so forth (65)

6 Simulation Results of ccumulated Water Treatment in Units -4 Turbine ttachment- T.P T.P. 8 (Water level inside Unit Turbine Building) ccumulated Water Level in Unit Turbine Building [mm] (Units - Connected) ccumulated Water Level in Unit Turbine Building Taking into ccount the Rainfall (Reference) ccumulated Water Level in Unit Turbine Building T.P T.P. 66 (Water level inside Unit Turbine Building) ccumulated Water Level in Unit Turbine Building [mm] (Units -4 Connected) ccumulated Water Level in Unit Turbine Building Taking into ccount the Rainfall (Reference) ccumulated Water Level in Unit Turbine Building [m ] 6 Capacity of the Centralized Radioactive Waste Treatment Facility 4 Centralized Radioactive Waste Total mount Process Main Building mount High Temperature Incinerator Building mount * * * [m ] Capacity and Volume of the Saltwater Tank Tank Capacity Waste Fluid mount Treated Water ( Saltwater) Receiving Tank mount The residual water of concentrated saltwater which is left at the bottoms of the storage tanks has been being treated. 49 The operations of the Evaporation Concentration pparatus have been suspended. 49 Multi-nuclide Removal Equipment has been in operation (under hot test). 49 Extension Multi-nuclide Removal Equipment has been in operation. 49 The operations of the other teatment facilities have been suspended Note - The amount of water treated through the nd Cesium dsorption pparatus is estimated to be 78m d (Subject to change depending on the factors such as the levels of water accumulated in TBs.) - "ccumulated Water Levels in Unit and TBs" are simulated water levels in consideration of the change of the water levels caused by recent rainfall, inflow of groundwater, etc. in the surrounding areas of the Fukushima Daiichi Nuclear Power Station. - "ccumulated Water Levels in Unit and TBs Taking into ccount the Rainfall" are simulated water levels which are calculated by adding to the accumulated water amounts which are assumed to increase at the rate 8mm a day when the surrounding areas of the Fukushima Daiichi Nuclear Power Station have the rainfall equal to the average amount of rain which fell for three months from ugust to October in 5 to 7. - Unit Turbine Building water level is controled by retained water transfer pumps in the Unit reactor building. - Unit Turbine Building water level is controled by retained water transfer pumps in the Unit turbine building. * Water transfer from the Unit-4 to the will be changeover from the High temperature incinerator building to the Process main building. * Water transfer from the Unit-4 to the will be changeover from the Process main building to the High temperature incinerator building.