Post on 29-Apr-2018
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Decommissioning of VUJE small
nuclear facilities
Experimental bituminization facility
Experimental incineration facility
Mr. Marian Urbanec
Head of Department for Radioactive Waste
Treatment
IAEA GSV, 11 October 2011
VUJE has two historical small nuclear facilities at the locality
of NPP A1 Jaslovske Bohunice. Both facilities served for
radioactive waste treatment.
Bituminization and Incineration facilities represented part of
Czechoslovak program for development of radioactive waste
treatment methods.
Obtained experiences were used for construction and
operation of full-scale units on NPPs in Czech Republic and
Slovakia.
Both plants are now in the process of decommissioning.
Introduction
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Experimental bituminization facility
Development of bituminization facility since 1982 till 1986
Main co-operant and equipment supplier VUCHZ Inc. Brno, Czech Republic
Non-active tests during 1987-1988 (200 m3)
Active tests and active operation since 1988 till 1998
In 1995 reconstruction for treatment of concentrates with dowtherm
It was treated about 250 m3 of concentrates from NPP A1 and NPP V1
Properties of product:
- content of salts till 40%
- total beta, gamma activity 1 MBq – 100 MBq/dm3
- main radionuclides: Cs137, Co60 (2%), Cs134 (2%), Sr 90 (5%)
Experimental incineration facility
Development of incineration facility since 1982 till 1985
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
History of operation
Co-operant and producer of furnace W-eko Inc., Ostrov nad Ohří, Czech Republic
Active tests and active operation since 1986 till 2001
About 139 000 kg of solid burnable RAW was incinerated
In 1993 was added to incineration facility cementation unit for cementation of the ash
View on incineration facility and cementation unit
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Regulatory limits for Experimental incineration facility :
amount of incinerated RAW per year : 24 000 kg
period of operation per year : 1000 hours
average beta activity of RAW : 1,5 MBq/kg,
maximum beta activity of RAW : 15 MBq/kg
maximum alpha activity of RAW : 50 kBq/kg
Permitted releases of activity:
beta activity per year : 22 MBq, per week 1,80 MBq
alpha activity per year : 200 kBq, per week 17 kBq
activity of Sr90 per year : 0,64 MBq
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Description
Experimental bituminization facility
Facility consists of:
- bitumen service dungeon (2 tanks, 1 gear pump, pipes) heated by steam
- concentrates service dungeon (2 tanks for concentrate. 1 pump, pipes),
2 tanks for dowtherm, 2 peristaltic pumps,
pipes for dowtherm
- film rotor evaporator, condenser capacity 100 l/h, rotor has 550 turns/min., three
sections heated by 1,0 MPa steam, power of
engine 7,5 kW
- condensate service dungeon (1 tank for unpurified condensate, 1 tank
for purified condensate, 1 filter, 1 ventilator)
- auxiliary systems (cooling water, steam distribution pipes,
ventilation systems)
- central control system in separated room for personnel
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Experimental incineration facility
Facility consists of:
- furnace with dosing equipment 2 chambers 780-1100°C, under- pressure 20-50 Pa, burning performance 30-60 kg/h, electro- mechanical dosing of RAW
- dry cleaning off gas system air cooler CHSV 40 ensured drop of temperature of exhaust air from 1100°C to 150°C
- cooling ventilator output 30 000 Nm3/h
- dry texture (polyesther) filter remote regenerated by reverse flow of air, filtration area 25 m2
- HEPA filter FAH 5100 3 pieces, filter flow 5100 m3/h, max. operation temperature 150°C
- off gas fan flow volume 2000-3000 m3/h
- propan-butan station it ensured required temperature of processing (now dismantled)
- central control system in separated room for personnel
- cementation unit primary cementation processing of ash in 200 l drums, it has got till now operation license for cementation of radioactive sludges
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Scheme of experimental incineration facility
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Decommissioning of VUJE nuclear facilities
There are two stages of decommissioning of VUJE nuclear
facilities
The 1st stage of both facilities decommissioning since January
2005 till 31 December 2010 :
•It was necessary to prepare set of licensing documentation
according to Atomic law for national authorities (Nuclear
Regulatory Authority and Public Health Authority)
•In 2006 VUJE received official permission from Slovak national
authorities for the 1st stage of decommissioning for both nuclear
facilities
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Description of the 1st stage of
decommissioning
The 1st stage of VUJE nuclear facilities decommissioning was named as
„the phase of safekeeping“.
Schedule of jobs
a) 2006 : Performance of periodic controls according to comprehensive
plan of post-operational technological and monitoring controls.
b) 2007 : Performance of periodic controls according to comprehensive plan of
post-operational technological and monitoring controls. Lid covered device on
200 l drums was dismantled inside Experimental bituminization facility and used
in another facility.
c) 2008 : Performance of periodic controls according to comprehensive plan of
post-operational technological and monitoring controls.
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
d) 2009 : Performance of periodic controls according to comprehensive plan of
post-operational technological and monitoring controls. Start of
decommissioning of inactive parts in Experimental bituminization facility
(release of bitumen from bitumen tanks) after signature of contract with the
Slovak Nuclear Fund for financing of VUJE´s nuclear facilities
decommissioning.
Start of decommissioning of inactive parts in Experimental incinerator facility
(propan-butan station).
e) 2010 : Performance of periodic controls according to comprehensive plan of
post-operational technological and monitoring control. Continuity of
decommissioning of inactive parts in Experimental bituminization facility
(bitumen service dungeon).
Continuity of decommissioning of inactive parts in Experimental incineration
facility (tanks for diesel oil and naphtha).
Working out documents according to Atomic law for national authorities
(Nuclear regulatory authority of Slovakia) for the 2nd stage of
decommissioning permission.
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Start of the 2nd stage of decommissioning
Experimental bituminization facility
- design of program for decommissioning of condensate purification facilities
from film evaporator and its approval (March / April),
- signature of contract with Slovak national nuclear fund for decommissioning
(June),
- implementation of program for decommissioning of condensate purification
facilities (July - till now )
- main problems in this year and for future:
a) financing of decommissioning process,
b) high prices for waste conditioning in „Waste treatment center Bohunice“.
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Decommissioning of nuclear facilities in 2011
Experimental incineration facility
- design of program for decommissioning of air-cooler and surrounding pipes
and its approval (March / April),
- signature of contract with Slovak National nuclear fund for decommissioning
(June),
- realization of program for decommissioning of air-cooler of incineration facility
(July - till now),
- performance of periodic controls according to comprehensive plan of post-
operational technological a and monitoring controls (increased frequency)
- main problems:
• the same as at for the bituminization facility,
• higher alpha contamination.
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia
Decommissioning of nuclear facilities in 2011
Many thanks for your
attention
VUJE Inc., Okružná 5, 918 64 Trnava, Slovakia