Safety Assessment of Former Uranium Milling Facilities in Ukraine and Restoration Strategy Conception

Transcription

1 State State Nuclear Regulatory Committee of Ukraine Nuclear Regulatory Committee of Ukraine Safety Assessment of Former Uranium Milling Facilities in Ukraine and Restoration Strategy Conception (part 1, Pridneprovsky Chemical Plant) V. Riazantsev,, SNRCU O. Voitsehovich, UkrGidromet.. Inst. A.Skalsky,, Geol. Science Inst. IAEA Technical Meeting on Uranium Exploration and Mining Methods November 2008, Amman, Jordan

2 URANIUM MINING AND MILLING IN THE WORLD

3 TECTONIC MAP OF UKRAINE More than 45% of territory of Ukraine settles down on the Ukrainian Crystal Shield

4 40 35 U in bottom sediments 30 Bq/kg U km from the Black Sea

5 Uranium tailings in Dneprodzerzhinsk site RELEASES from tailing sites : 5 Dnierovske ( 4 water ) 7 Lazo ( 10 - water) Central Yar ( 3 water) 8 South-Eastern ( 2 water) 9 Sukhachevske ( 5, 8, 9 air and water) Industrial IAEA Technical Site Meeting ( 1 on water) Uranium exploration and mining methods, Jordan, Amman, November 2008 Base C (6, 7)

6 Basic objects subject to the control and rehabilitation Dniper riv. Konoplyanka riv. residential area Treetuzny pit Industrial site

7 Estimation of safety and ground of optimum strategy and technology of dismantling out of building 103 and relocation of tailing material outside existent site can be a pilot project Problem how to provide safety of other facility personnel?

8 Surface State contamination Nuclear Regulatory of tailings Committee very various of Ukraine due to low quality of soil covering 30 mksv/h Central Yarе South-East Tailing exhalation Rn-222, 5,5 Bq м2 s

9 W1A W1B W2 W3 W4 Scenarios and main path and dose of personnel State Nuclear Regulatory Committee of Ukraine Personnel having an access no less than 2/7 working hours in contaminated buildings (103) or is busy at work on decontamination of contaminated objects, 1/7 on territory and 4/7 in the clean apartments Personnel of enterprises (electricians, fitters) which conduct no less than 1/7 in the contaminated buildings, 1/7 on adjoining territories (tailing «Western»), 5/7 in the PGMZ apartments The Polychim personnel busy in works round s sediment box and on territory «Central Yar» tailing, and also buildings on that territory The CZLab personnel and other which work in clean buildings, but of time (1/7) conduct part on territory Central Yar tailing, and also (during breaks) on territories near tailings Personnel is SE «Barrier», dosimetrists which spend no less than the 3/7 working time on tailing sites, 2/7 on territory in the their impact and 2/7 in the clean apartments Inhalation, dust, ext. exposure, radon radon Inhalation, ext. exposure, radon Inhalation, dust, ext. exposure, radon Inhalation, ext. exposure, radon 3,5 33,5 7,6 11,4 1,3 2,8 0,8 1,6 1,7 12,4 W5 Administrative personnel and workers of enterprises on the north site Inhalation 0,22 0,44

10 Annual eff. dose according to scenario (msv/y) 41, ,536 Scenario Total annual dose (msv/a) Minimum Mean Maximum W1A Min Среднеє Max W1B W W W W WORST annual dose limit 20 msv/y 15 11, , ,463 4,381 1,014 0 Limit - 5 msv/y 6,027 2,108 2,131 1,315 1,557 1,727 0,563 0,215 0,796 0,38 0,0850,192 0,444 IAEA Technical 1.1A Meeting 1.1B on Uranium exploration 1.2 and mining 1.3 methods, Jordan, 1.4 Amman, November Гірший ,402

11 Underground water About 50 control wells. Underground water is considerably contaminated.

12 Bq/m 3 234,238 U и 226 Ra in porous water of tailings Total alpha-activity U 238U 226Ra 1 W.6593 W.6594 W.1ZP W.2 ZP W.3 ZP W. 2D W. 4D W.19D W. 16D W. 48D IAEA Technical Tailing Meeting on Uranium Tailing exploration Zapadnoe and mining methods, Jordan, Tailing Amman, Dniprovske November 2008 Centralny Yar

13 U flux from D to Dnepr river for different scenario U f l u x f r o m " D " t a i l i n g s t o D n i e p e r R i v e r f o r d i f f e r e n t s c e n a r i o s 2, 5 E E b a s e c a s e c o n s e r v a ti v e s o i l c o v e r w a s te r e m o v a l 1, 5 E U fl u x, B q / y 1 E E t i m e, y

14 State Nuclear Regulatory Committee of Ukraine U concentration in the aquiferat site boundary Preliminary estimations of effect of deleting or coverage of for different scenarios 200 tailing surface base case waste removal soil cover 120 U, B q /L IAEA 0 Technical Meeting on Uranium exploration and mining methods, Jordan, Amman, November

15 Возможные стратегии реабилитации промплощадки ПХЗ и прилегающих территорий Dniper riv. Possible strategy of rehabilitation of Pridneprovsky site Coverage and waterproofing Konoplyanka riv. residential area LAZO Treetuzny pit Sediment box Decontamination IAEA Technical Meeting on Uranium exploration and mining methods, Jordan, Amman, November Suhachovka 2008 Industrial site tailing

16 THANK YOU!