Introduction of the Decontamination Method Which Uses Blasting ISOE/ATC 2006/10/12 ALARA SYMPOSIUM Oct./12/2006 IN YUZAWA JAPAN

Introduction of the Introduction of the Decontamination Method Decontamination Method

Which Uses BlastingWhich Uses Blasting

ISOE/ATC 2006/10/12 ALARA SYMPOSIUM

Oct./12/2006

IN 　 YUZAWA 　 JAPAN 　　

Contents

1. Outline 1. Outline Decontamination2. History of Mitsubishi 2. History of Mitsubishi

decontamination technologiesdecontamination technologies3. Decontamination using blasting3. Decontamination using blasting4. Cavitations jet (CJ) 4. Cavitations jet (CJ)

decontaminationdecontamination5. CJ + blast decontamination 5. CJ + blast decontamination 6. Revolving flow polishing method6. Revolving flow polishing method7. Summary7. Summary

1. 1. Outline Outline Decontamination

The purpose of The purpose of decontaminationdecontamination

Exposed reduction of a worker

Loss in quantity of radioactive waste

DF

Configuration of an object（ structure, physical amount ）

Schedule（ Time required ）The amount of

secondary wastes

Cost

function of subject

Area space

Determination of the decontaminating method

1

2. 2. History of Mitsubishi History of Mitsubishi decontaminationdecontamination technologies technologies1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012

除染種類除染対象 S50 S51 S52 S53 S54 S55 S56 S57 S58 S59 S60 S61 S62 S63 H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13 H14 H15 H16 H17 H18 H19 H20 H21 H22 H23 H24

供用中機器物理除染

電解除染

供用中機器

化学除染

廃棄物

廃炉

廃棄物（廃炉解体後除染を含む）

RCPｲﾝﾀｰﾅﾙ

AP-AC(ﾀｰｺﾃｺ゙ﾝ) AP-AC(ｸﾘﾃｺ゙ﾝ) AP-改ACNP-改AC希薄

CORD5ﾌﾗ゚ﾝﾄ(11基) DF=6～20 10ﾌﾗ゚ﾝﾄ(12基) DF=8～30 27ﾌﾗ゚ﾝﾄ(61基) DF=4～35

45ﾌﾗ゚ﾝﾄ(50基) DF=5～130

10ﾌﾗ゚ﾝﾄ(10基) DF=20～75

AP-改AC4ﾌﾗ゚ﾝﾄ(4基) DF≒ 10

ﾙｰﾌ隔゚離弁

RCPｹｰｼﾝｸﾞNP-改AC希薄

1ﾌﾗ゚ﾝﾄ(2基) DF≒ 120

ｷﾚｰﾄ系2ﾌﾗ゚ﾝﾄ(2ﾙｰﾌ )゚ DF≒ 4

ふげん原子炉冷却材系(系統除染)

1ﾌﾟﾗﾝﾄ DF≒ 10

廃液蒸発装置

ｷﾚｰﾄ系

2ﾌﾗ゚ﾝﾄ(7系統) DF=2～20

RTDﾊｲ゙ﾊｽ゚配管

AP-改AC NP-改AC8ﾌﾗ゚ﾝﾄ(24系統)

DF=7～70

NP-改AC希薄2ﾌﾗ゚ﾝﾄ(6系統) DF=30～40

原子炉容器上蓋

NP-改AC希薄4ﾌﾟﾗﾝﾄ DF=10～30

保管中蒸気発生器

CORD

熱交換器

ﾗｯｸ等ﾘﾆｭｰｱﾙ廃棄物

系統除染

ﾗｯｸ等ﾘﾆｭｰｱﾙ廃棄物

電解等[実機適用]

蒸気発生器水室

ﾎﾛ゙ﾝｳｪｯﾄﾌﾗ゙ｽﾄ23ﾌﾗ゚ﾝﾄ(83水室) DF≒ 2

RCPｹｰｼﾝｸ (゙MCP含む)

1ﾌﾗ゚ﾝﾄ(4個所) DF＞10ｱﾙﾐﾅｳｪｯﾄﾌﾗ゙ｽﾄ

主冷却材管切断端

ｱﾙﾐﾅﾄﾗ゙ｲﾌﾗ゙ｽﾄ11ﾌﾗ゚ﾝﾄ(58個所) DF＞10

有機酸系2ﾌﾗ゚ﾝﾄ（2ﾙｰﾌ）゚DF≒ 10

1ﾌﾟﾗﾝﾄ DF≒ 10

ﾗｯｸ/ 高圧水3ﾌﾟﾗﾝﾄ DF≒ 2

ﾗｯｸ/ 高圧水2ﾌﾗ゚ﾝﾄ

RV出入口管台内面(ｸﾗｯﾃｨ゙ﾝｸ）゙

SG伝熱管内面

1ﾌﾟﾗﾝﾄ DF＞10

ｱﾙﾐﾅｳｪｯﾄﾌﾗ゙ｽﾄ1ﾌﾗ゚ﾝﾄ(4個所) DF＞10

1ﾌﾗ゚ﾝﾄ(4個所) DF＞10

SODP/ CORD他〔技術検討〕

SUSｶｯﾄﾜｲﾔﾌﾗ゙ｽﾄ

SUSｶｯﾄﾜｲﾔﾌﾗ゙ｽﾄ

NP-改AC希薄

2ﾌﾟﾗﾝﾄ DF≧ 10

有機酸系

2

3. 3. Decontamination using Decontamination using blastingblasting

ﾌﾞﾗｽﾄ材収

2 次ｻｲｸﾛﾝｾﾊﾟﾚｰﾀ

Blaster （ Blast circulation system ）

Vacume blast gun

Blast tank

(Vacuumed pressure)Recovery blower

Blast equipment(primary cyclones separator )

Sup

ply

of a

irBag filter dust sampler

3

facility which lifts

Air pressure power control panel

The control panel of a whole system

BlasterCompressor

Accumulator Drier

CoolerDrier

Filter

Drum Drum with radiation shieldOutdoors

Blower

Hose balancer

R/V

Hose balancerHose balancer

platform for shieldsDecontamination equipmentR/V outlet shield

plug

R/V outlet nozzle neck

Nozzle （ Vacuumed blast gun ）

Pipe （ nozzle neck mockup ）

AIR Cylinder for forcing nozzle

Guide roller　研削した跡

Functional examination situation


4

１． Decontamination equipment （１） Decontamination system ： Dryness type vacuumed

blast（３） Guide system ： Trapezoid screw sending type nozzl

e rotation（４） Weight ： About ６００ kgf ／ set

2 ． Utilities（１） Used power supply ：ＡＣ２００Ｖ（２） Used air supply ： Station service air ０ . ６ MPa


main specifications

5


6

aluminaAℓ2O3

GlassSO2 Boric

Iron SUS

Particle Cut Wire Particle Cut Wire

DF large small small middle large

Remaining effects

large middle small large small

Cost large small small small small

Damage large small small middle large

Features of various blasting materials

Particle diameter of the blast materials 　：　　 UsualUsual 　　 φ0.1φ0.1 ～～ 2mm2mmBlast pressure 　：　　：　 UsuaUsua ｌ　ｌ　 l5l5 ～～ 6kg/cm6kg/cm22

Blast Angle 　：　　：　 UsualUsual 　　 45°≦45°≦


Before （ × ２００） After 1-time use （ × ２００）

The configuration before and after activity of blast material (stainless steel grid)

Case of 　 projection factory test to steel materials

7

• When the amount of grinding is largeWhen the amount of grinding is large 　⇒　　⇒　 Reduction in thicknessReduction in thickness 　　 Loss of a resisting pressure functionLoss of a resisting pressure function 　　　　　　　　 8.18.1 ～～ 8.7μm/2times8.7μm/2times ，， 13.313.3 ～～ 15.1μm/3 times15.1μm/3 times• When the amount of grinding is locally largeWhen the amount of grinding is locally large 　⇒　　⇒　 SCCSCC ，， Fatigue occursFatigue occurs 　　　　　　• Influence on the plant by remainingInfluence on the plant by remaining （（ Remainder of recoveryRemainder of recovery ，， Remainder of Remainder of

PiercedPierced ））　　　　　　 They are 10cc remains at the blast of about They are 10cc remains at the blast of about

300ℓ300ℓ 　　


The check of the soundness of target The check of the soundness of target materialmaterial

8

4. 4. Cavitations jet (CJ) Cavitations jet (CJ) decontaminationdecontaminationIt compares with high-pressure water washing in mind,

and is a high physical impulsive force efficiently　　⇒　 Compact equipmentWith no pollution expansion of dust generating etc. into air because of underwater washingWith no influence which it has on lining in washing time of a decontamination levelFundamentally, with no secondary waste by decontamination

9

bubbles

Liquid

Contraction

Cavitaavitation

Object Purpose Before After DF Note

Pitsurface

Pollutionremoval

22000 cpm

700 ～ 1200 cpm 18～ 30

ＣＪ＋washin

g

fuel rackcell

inside

Doseratereductio

n

5.9 mSv/h 0.9 mSv/h 6.6

UnderwaterMeasureme

-nt data

Track record ①

Track record② The part which has clad adhesion by contact to the fuel for a fuel extraction facility

ＤＦ２．１～１３．５（総平均８．８）

Spent fuel pit surface of wall and fuel rack cell inside

4. 4. Cavitations jet (CJ) Cavitations jet (CJ) decontaminationdecontamination

10

Before(Those with blackish brown clad)

After(With no adhesion remains of

clad)

The application example to fuel extraction equipment


11

High-pressure pump

長靴

Nozzle

2m

About 6m

Ｃ／ＶＡ／Ｂ

Pure water for work

Lifting frame

Track frame

Transfer pipe

Drain part washing

Nearly drain Floor surface washing

Operation floor

Cavity

Enforcement example ：

　 Fuel transfer pit

　　　　　 Outline specificationHigh-pressure pump ： 16MPa －18L/min　　 (Hand-pushed conveyance type) Nozzle ： 10MPa － 4.4 L/minRequired utility ： The power supply for pumps　 220V － 23A ， Water for washing about4 ｍ 3


12

The polish grain mixed in the cj grinding-removes adhThe polish grain mixed in the cj grinding-removes adhered cladered clad

The decontamination effect higher than what added thThe decontamination effect higher than what added the decontamination effect of CJ and a blast simplye decontamination effect of CJ and a blast simply

5. 5. CJ + blast CJ + blast decontaminationdecontamination 　　　　　　［［ Finishing patentFinishing patent applicationapplication ］］

◎ ◎Influence examination to in service equipment and Influence examination to in service equipment and apparatusapparatus・・ In a system application test, it affection-evaluates with a In a system application test, it affection-evaluates with a

mock-upmock-up The faculty of a facility is not affected even if it executes for The faculty of a facility is not affected even if it executes for 30 30 minutesminutes◎◎The faculty of a facility is not affected even if it The faculty of a facility is not affected even if it

executesexecutes 13

5. 5. CJ + blast decontamination CJ + blast decontamination

P

P

PI

PI

crane

control panel

Blast grainsuction nozzle

Turn table

Frame

ＣＪ+ stream Blast grain SG insert plate

When collectingBlast grainsreturn line

strainer

Circulation pump(Mono flex pump)

Surplus water return line

Water recovery line

Manometer

Filter housing

To air filter Air purge line

フィルター Water drain line

To floor drain

High-pressure pump

22MPa,15ℓ /min

High-pressure pump feed line

Nozzle feed device

Container

14

5. 5. CJ + blast decontamination CJ + blast decontamination

Before After

15

Applicability test with actual machine

Object ： SG insert plate

5. 5. CJ + blast decontamination CJ + blast decontamination The decontamination result in a system The decontamination result in a system application testapplication test

　　　　　　　　　　　　　　　　　　　　　　　　

Notes : ( ) inside value is the dose rate to extractedNotes : ( ) inside value is the dose rate to extracted

Object Before After DecontamDecontamination ination timetime

D.F.D.F.

ＢＢ -- ＳＧＳＧＨＯＴＨＯＴ

40mSv/h40mSv/h

(14.97mSv/(14.97mSv/h) h)

0.7mSv/h0.7mSv/h

(0.09mSv/(0.09mSv/h) h)

60 min.60 min. 166166

ＤＤ -- ＳＧＳＧＣＯＬＤＣＯＬＤ

25mSv/h25mSv/h

(9.96mSv/h) (9.96mSv/h) 0.63mSv/h0.63mSv/h

(0.09mSv/(0.09mSv/h) h)

90 min.90 min. 111111

16

6. 6. Revolving flow polishing Revolving flow polishing methodmethod　　　　［［ Finishing patentFinishing patent applicationapplication ］］　〈 Aim 〉

　 Inside contamination of long piping which has a crookedness part is decontaminated

　 A revolution style is given to a flow Blast grain Blast grain

In the conventional blasting, it checks that the piping crookedness part round which an Blast grain does not spread can also be decontaminated efficiently. 17

6. 6. Revolving flow polishing Revolving flow polishing methodmethod

The outline of the gas revolution flow grinding method

18

Principle of generating revolving flow

Q1: Air to be used for revolving flowQ2: Air to be used for suppressing revolving flowQ3: Air to be used with abrasive

Fluidics

Abrasive

Insertion type

Revolving flow type

Tube to be decontaminationed

Insert the sliding nozzle from tube end and make it

move.

Range of decontamination is

small

Sliding nozzle

Tube to be decontaminationed

Range of decontamination is

small

Butt tube ends

Fixed nozzle

Distances the revolving flow can reach

Distance from nozzle outlet L (m)

Characteristic between speed of abrasion and distance (Long tube)

Sp

eed

of

ab

rasi

on

　 δ (

μ

　

m/m

in)

δμ


Since the flux which induces revolution speed is Q1, if a flux ratio becomes large, degree centrifugal force will become weaker and grinding speed will become small.

Element examination

図４研削速度と配管内平均速度との関係

0

0. 1

0. 2

0. 3

0. 4

0. 5

0. 6

0. 7

0. 8

30 35 40 45 50 55 Um ( m/ s)配管内平均速度

研削

速度

d

(mm/

min)

図６研削速度と流量比との関係

0

0. 1

0. 2

0. 3

0. 4

0. 5

0. 6

0. 7

0. 8

0 0. 5 1 1. 5 2

( Q2+Q3) / Q1流量比

d

(m

m/mi

n)研

削速

度

19

Sp

eed

of

ab

rasi

on

　

Average speed in piping

Sp

eed

of

ab

rasi

on

　

Relation between grinding speed and the average flow velocity in piping

Flux ratio

Relation between grinding speed and a flux ratio

If the average speed in piping is made quick, grinding speed will increase


Separator

Vacuum cleaner

Fluidics

＊ A

Oil pressure

pump

＊ B ＊C

＊ F ＊ G

Discharge side

（ Hot side ）Inhalation

side

（ Cold

side ）

Suction plug

Seal plug

Hopper

管板

Preliminary recovery line

Supply

line

Recovery

line

＊ D

Steam generator heat-exchangers tube inside decontamination equipment System composition figure

＊A： For blast material supply

＊B： For revolution style

generating

＊C： For revolution style control

＊D： For hopper pressurization

＊E： For vibration

＊F： For discharge part seals

＊G： For inhalation part seals

＊ E

Steam

generator

Channel head

SG

Heart

exchanger

tube

① Supply air former Pressure ： 0.5MPa② amount of grinding airstreams ａ． For revolution style generating （ Q1 ）：1200NL/min ｂ． For revolution style control （ Q2 ）： 400 NL/min ｃ． For grinding material supply （ Q3 ）：180NL/min③ Blast material ： 200μm 　 Alumina grain④ Decontamination time ： 40 分

System application examination

20

Seal

plug

Oil pressure

pump

Reduction of the amount of secondary Reduction of the amount of secondary generation wastesgeneration wastes

Improvement in the speed of Improvement in the speed of decontamination speeddecontamination speed

Cost reductionCost reduction Radiation exposure reductionRadiation exposure reduction

7. 7. SummarySummaryThe needs for

decontamination【 Former is also from now

on 】

21

The spirit of ALARA has been, and will be respected in our efforts forever.

Documents

Introduction of the Decontamination Method Which Uses Blasting ISOE/ATC 2006/10/12 ALARA SYMPOSIUM Oct./12/2006 IN YUZAWA JAPAN