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Third Technical Meeting (TM) on the Environmental Modelling for RAdiation Safety
EMRAS IIIntercomparison and Harmonization Project
IAEA Board Room (Room A, M Building), IAEA Headquarters, Vienna
24–28 January 2011
Wu Qifan
IAEA Board Room (Room A, M Building), IAEA Headquarters, Vienna24–28 January 2011
Overview of Legacy/NORM sites in Bayan Obo and Baotou, Inner Mongolia, China
Contents 1. Sites description2. Monitoring programme3. dataset available for modelling4. Preliminary work for next meeting
Inner Mongolia BaoTou Iron and Steel Plant (Group Ltd.)
or BTISP
founded in 1954
•Bayan OboMining and crashingMilling (2008,one pipe for water, another for
concentrated slurry)
•Baotou
Iron and Steel PlantRare earth plants (1974 )
1. Sites description
• 9×106 t/a products of iron and steel • more than 7×103 t/a products of oxide
equivalent of REO (2006).
Inner Mongolia BaoTou Iron and Steel Plant (Group Ltd.) or BTISP
150Km
180KmBaotou
Baiyunebo
Huhehaote
Bayan Obo Mining Sites Ores (O),Dumping sites(A,B,C,D,E)
Main Mine East MineWest Mine
A
B
C
ED
O
A new milling plant and
Tailing pond
Mining sites in Bayan Obo
About 10×106 t/a of ores are recently minedAbout 276×106 t of ores had been mined by the end of 2006.
open pit mines
1520×1080m2 for Main Mine, 1400×1020m2 for East Mine
•Main Mine and East Mine
•West Mine
a big open pit mine,started in May, 2006.
4,600 m in length1,000 m to 1,200 m in width. The present production of ores is expected to be 3×106 t/a,
Mining sites in Bayan Obo
About 10×106 t of waste rocks are produced annually.
Total amount of waste rocks is about 560×106 t , piled up in the waste rock dumps.
•waste rock dumps
Mining sites in Bayan Obo
A new milling plant and
tailing pond has operated since 2005.
The BTISP and Baotou City
BTISP
RE industry
Tailing pond
Ferrous slagdump
Huanghe River
Refiningiron and steel
Tailings , 149 ×106 t , 2006an area of 11km2
6.55×106 t/a with 0.048% Th
ferrous slag, 3.55×106 t/a1km2
RE Processing
acidic process slag ,60×103
t/a , gross α , n×105Bq/kg, in Radioactive Waste Storage Facility
RE oxides, RE chlorides, RE carbonates and alloy products
brickyard
Recovery of iron
about 1450,000 t/a of ferrous slag has been used to make cement, bricks and other building products
2. Monitoring programme
2. Monitoring programme
•Regional Radiological data
Aero survey and ground measurementsWork was done during 2006-2009
•Monitoring dataThe Monitoring Data of Baotou Radioactive Environmental Quality , required by regulation, and carried out by INNER MONGOLIA RADIOACTIVE ENVIRONMENT MANAGEMENT INSTITUTE
sites with elevated levels of radioactivity Main Mine East Mine
West Mine
A
B
C
ED
O
BG: 85nGy/hHBG:200—800nGy/h ( about 55.4 Km2)Mining sites and Ores (O):600 to 2000nGy/h Dumping sites(A,B,C,D,E): 400 to 800nGy/h
1200nGy/hhot spots (P1-5): 500-2000nGy/h
P1 P2
P3
P5
P4
sites with elevated levels of radioactivity
BG: 65nGy/h (50Bq/Kg for Th)Tailing pond: 650-1200 nGy/ h ( 11 Km2)Ferrous slag dump: 500-1200 nGy/ hThe contaminated soil area:
85-150nGy/h80-200Bq/kg for Th in the upper layer of 10 -20cm.
32 hot spots : 120-1200nGy/h
contaminated soils
hot spots
BS-the buildings made of slag bricks.BNS-the normal buildings not containing slag
12.6337.7860.86BNS16.12186.25212.5BSE-8Gy/hnJ/m3nJ/m3
Gamma dose rate
PAEC of 220Rn progeny
PAEC of 222Rn progenyIndoor
radiation
Indoor radiation of buildings built in different years
0
0.5
1
1.5
2
2.5
3
3.5
1950s 1960s 1970s 1980s 1990s After 2000years
Indoor Rn(mSv/a)
3. dataset available for modelling
Ferrous slag produced in defferent years
1.880.38153.6±27.8426.6±52.275.9±10.82008
2.360.60211.3±41.1516.4±66.9120.6±20.62007
2.390.53169.3±16.3536.6±24.3106.1±9.62006
2.400.60154.7±6.9529.2±16.3119.5±8.320052.530.45112.9±7.9588.1±41.390.9±6.320032.670.53132.2±15.
6612.0±108.2105.8±15.319965.420.51187.2±18.
81327.0±159.2101.9±16.319935.030.41274.9±55.
01233.6±148.081.9±12.319936.530.41341.0±64.
81618.2±194.282.9±13.319928.280.48236.2±75.
22072.6±254.195.1±24.5before1990
IγIRa
40K Bq/kg
232Th Bq/kg
226Ra Bq/kgyears
Building material in Baotou
0.990.28402±32.156±2.1192±12.6Brick factory4
1.600.42429.2±32.783.6±8.7330.9±32.4Cement factory3
1.080.12371.9±12.424.6±1.2240.1±21.7Cement3 factory 2
1.010.29192.2±12.358.9±2.7209.8±12.1Cement2 factory 2
0.270.18122±9.035.5±2.839.0±2.7Cement1 factory 2
0.980.25123±17.851±2.5212±22.5Brick2 factory1
1.180.23210±24.145±3.4180±17.2Brick1 factory1
IrIRa
40KBq/kg
226RaBq/kg
232Th Bq/kgproducts
•Gamma dose rate and U-238, Ra-226 and Th-232 concentrations in soil,
•Aero survey and ground measurementsWork was done during 2006-2009
•Other dataThe Monitoring Data of Baotou Radioactive Environmental Quality , required by regulation(year 2006) , andA Study of Radiological Impact on Baotou Area resulting from Exploitation of Bayan Obo Ores (1998), INNER MONGOLIA RADIOACTIVE ENVIRONMENT MANAGEMENT INSTITUTE
Meteorology
Wind rose
N
NE
E
SE
S
SW
W
NW
3.503.403.403.203.902.602.702.902.902.902.702.402.902.202.603.50speed
21.3014.709.602.202.001.804.503.804.904.205.705.004.601.001.002.0011.90fre
q.annu
al
3.002.902.002.001.201.402.002.001.901.901.901.201.102.202.002.50speed
27.4020.712.003.001.701.203.003.005.004.001.702.301.700.000.050.8011.00fre
q.
W
4.304.604.004.202.403.603.604.404.404.002.402.502.402.802.354.00speed
19.1019.0015.0010.003.002.504.803.103.202.503.002.702.800.602.503.0019.50fre
q.
F
5.905.606.405.207.204.004.804.103.204.054.802.202.002.004.007.20speed
23.3015.0012.605.003.803.805.203.105.002.603.503.001.800.801.001.1010.00fre
q.
SP
3.103.004.501.802.702.402.303.003.402.702.602.403.501.603.302.70speed
15.67.005.000.601.001.303.005.006.506.0012.109.807.001.301.201.306.10fre
q.
S
CNNWNWWNWWWSWSWSSWSSSESEESEEENENENNENSea-son
Routine monitoring data
Work placesEnvironment•Water•Aerosol (dust)•Solid matterials•222Rn/220Rn
Refiningiron and steel
RE Processing
Case1 Point sources4. Possible scenarios for modelling
Large quantity of ash releases from stacks
contaminated soils
Case2 Area sources
4Km
4. Possible scenarios for modelling
Contaminated areas(onsite/offsite)
Case3 indoor Rn
Some other cases: about
•Coal industries•Phosphate industries
Which code(s) should be used?
After the material of Second Working Group Meeting, 2009.9.23
Models available within group• CROM• PC-CREAM• RESRAD-OFFSITE• PRESTO• COMPLY• (Radon code) exhalation into buildings
CROM – Juan Carlos RESRAD – Charley, Dr. Sunita KambojERICA Tool – JustinReCLAIM – Kremena
After the material of Second Working Group Meeting, 2009.9.23
35
phosphate4.62%
iron44.47%
coal29.42%
copper6.48%
lead/zinc1.22%
tin2.03%
coal gangue2.17% aluminum
2.95%vanadium1.23%others4.48%
zircon0.04%
niobium/tantalum0.05%
rare-earth0.86%
2011 programmes
NORM solid waste distribution in China
2011 new programmes
•Coal industries
•Phosphate industries