introduction of the decontamination method which uses blasting isoe/atc 2006/10/12 alara symposium...
TRANSCRIPT
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 ゴン) AP-AC(クリテ ゴン) 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ケーシング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プ 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プ 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プ ラント DF≒ 10
ラック/ 高圧水3プ 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プ 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プ 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 次サイクロンセパレータ
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
3. 3. Decontamination using Decontamination using blastingblasting
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
3. 3. Decontamination using Decontamination using blastingblasting
main specifications
5
3. 3. Decontamination using Decontamination using blastingblasting
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°≦
3. 3. Decontamination using Decontamination using blastingblasting
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
3. 3. Decontamination using Decontamination using blastingblasting
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
DF 2.1~13.5(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
4. 4. Cavitations jet (CJ) Cavitations jet (CJ) decontaminationdecontamination
11
High-pressure pump
長靴
Nozzle
2m
About 6m
C/V A/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
4. 4. Cavitations jet (CJ) Cavitations jet (CJ) decontaminationdecontamination
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 -- SG SG HOT HOT
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 -- SG SG COLD COLD
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
6. 6. Revolving flow polishing Revolving flow polishing methodmethod
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
6. 6. Revolving flow polishing Revolving flow polishing methodmethod
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.