Analysis on Waste forthe Decommissioning of FDNPS
August 29, 2022
Shuichi Kaneko
Nuclear Regulation Authority

Variety of Waste Materials in FDNPS
Variety of Nuclides
Wide Range of Mass and Concentration
Various Materials in Various State
Massive Amount of Radioactive Waste
Cut Wood

Location of Radioactive Waste

Rubbles

Combustibles
From the website of TEPCO Holdings
https://www.tepco.co.jp/decommission/progress/waste/

Nuclides Absorption UnitsVarious Waste Materials (mainly rubbles)
Sheetcovered

Open-airContainer

Soilcovered＞

WasteStorage＜CurrentStatus

Various CombustiblesMelt

VolumeReduction

Incinerator

Pretreatment

Contaminated Soil

Incinerator

Solid Waste
Storage #1-9
Additional Solid
Waste Storage

From the website of TEPCO Holdings
https://www.tepco.co.jp/decommission/progress/waste/Estimation on Amount of Rubbles
On March 2033
Generation×104 m3
After reuse
60.2

79.4

After reduce
26.7

Reuse
19.2

Reduce33.5

Example of Heavily Contaminated Components:
Shield Plug over the PCV

Joint ofShield PlugTop

Operating Floor

Top

Reactor Well

Fission Products

MiddleMiddleBottomRPV
Shield Plug

Reactor Well

PCVBottomDebris from Damaged Core
テーブル状の堆積物

A．Table-shaped deposition at pedestal entrance

B．Lump-shaped deposition inside pedestal entrance

215°
X-2penetration0°

Pedestalentrance

90°
From the TEPCO’s Materials at the NRA meeting on FDNPS Accident Study

180°

C.

Table-shaped deposition

Generated with the Decommissioning Activities

ScaffoldProtection Gears

Containers storing used cloths

Characteristics of Wastes and Needs of Analysis

Wide variety, high radiation dose, massive volume… and unkowns
Widening needs for application of analysis and its results（methodology, resource, efficiency, accuracy, applicability, timeliness, etc.)
Identifying characteristics before handling and utilize the results afterwards
Flexible approach required for consideration on the categorization of wastematerials and the ways of storageCapacity Building for Various and Massive Analysis
Currently insufficient analyzing capacity in Japan!
Can TEPCO and other organizations doing analysis beenough to accomplish decommissioning?

１

Put priority on enhancing capacity of analysis

２

Require initiatives to increase analytical resources①Continuous in long term,②High quality,③Enough amount of,a. Human resources,b. Facility and equipment,
c. Operational resources,

are systematically required.

Reference: Categorization and Amount of Waste fromordinal NPP decommissioning
Example of Unit 5 of FDNPS Estimation

L1
1%

Category of Radioactive Waste

Amount /tonCategory 1－Beyond Category 2

Relatively high radiation (L1)
[mid-depth80

14C:10PBq/t, 36Cl:10TBq/t, 99Tc:100TBq/t,

Cat. Relatively low radiation (L2)830

14C:100GBq/t, 60Co:1PBq/t, 63Ni:10TBq/t,

L2
9%

L3
90%

2

[pit]
Very low radiation (L3)[trench]
Non-Radioactive Waste

Amount of Radioactive Waste（Total: 9,140ton）

Criteria

129I:1TBq/t, α-emitter:100GBq/t

90Sr:10TBq/t, 99Tc:1GBq/t, 137Cs:100TBq/t

α-emitter:10GBq/t

8,230

60Co:10GBq/t, 90Sr:10MBq/t, 137Cs:100MBq/t

Amount /tonCriteria

Below Clearance Level

13,700Uncontaminated Waste

311,000

Clearance level of radiation－Analysis for the Long-term Storage
Identify Analytical needs for long-term stable and safe storage andcategorization of waste storage
Monitor long-term situation of stored waste and utilize the results ofmeasurement１

Material to consider categorization of waste for the future disposal

２

Envisioning determination of measures to be taken