Decommissioning of VUJE small nuclear facilities€¦ · Decommissioning of VUJE small nuclear facilities ... -bitumen service dungeon (2 tanks, ... 200 l drums was dismantled inside

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



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%)


Development of incineration facility since 1982 till 1985


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


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


Description


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



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


Scheme of experimental incineration facility


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


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.


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.


Start of the 2nd stage of decommissioning


- 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“.


Decommissioning of nuclear facilities in 2011


- 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.


Decommissioning of nuclear facilities in 2011

Many thanks for your

attention


Documents

Decommissioning of VUJE small nuclear facilities€¦ · Decommissioning of VUJE small nuclear facilities ... -bitumen service dungeon (2 tanks, ... 200 l drums was dismantled inside