08 Bothe - Release of Buildings and Sites at VKTA Rossendorfx · 2010. 11. 23. · Bothe: Release of Buildings and Sites at VKTA Rossendorf 13 10 O O 14 10 1 15 15 3 10 25 16 2 15

Release of Buildings and Sites at VKTA Rossendorf

Matthias BotheVerein für Kernverfahrenstechnik und Analytik Rossendorf e.V.

PF 510119, 01314 Dresden, [email protected]

Bothe: Release of Buildings and Sites at VKTA Rossendorf

research reactor Rossendorferwaste treatment

centre

isotope production facility



waste treatment centre

stream

research reactor

isotope production facility


Decommissioning complexes

Decommissioning complexes•Complex 1: Reactors

• Rossendorf Research Reactor (RFR)• Rossendorf Ring Core Reactor (RRR)• Rossendorf Assembly for Critical Experiments (RAKE)

•Complex 2: Isotope production facility•Complex 3: Waste treatment centre


Rossendorf Research Reactor (RFR)

Rossendorf Research Reactor•light water modulated and cooled tank reactor (SU)•10 MWtherm•1014 ncm-2s-1

•1957 – 1991 (105 115 h operating time)•purposes:

• nuclear physics• reactor physics• safety research• neutron activation• production of neutron transmutation doped silicon






1962 –1991 maximal 1 kW

Rossendorf Ring Core Reactor (RRR)


Isotope production facility

Isotope production facility•AMOR – Anlage zur Molybdän-Rückgewinnung

(facility for molybdenum recovery)• product: Mo-99 (decay to Tc-99m for radiopharmaceuticals)

•various nuclides for tracer experiments in industry•sealed sources


Isotope production plant

Hot cell







Co-60Cs-137Eu-152/154Sr-90

alpha beta gamma

Ra-226 H-3 Na-22U-isotopes C-14 Co-60Pu-isotopes Cl-36 Cs-134Am-241 Fe-55 Cs-137

Ni-63 Ba-133Sr-90/Y-90 Eu-152

Eu-154Eu-155

Relevant Radionuclides








FußwegKontrollbereichsgrenze

Gebäude 8d

Verbindungsgang

01

23

1

Stra

sse

K7

10

100

1000

Netto-Impulsraten [IPS]

Abbildung 1



Fußweg

Strasse K1

Gebäude 8d

Verbindungsgang

RKS 11

RKS 12

RKS 7RKS 5

RKS 3RKS 8

RKS 4

RKS 1RKS 9

RKS 6

RKS 13RKS 2

RKS 10

RKS 14RKS 16

RKS 17

RKS 18

RKS 19

RKS 15

KontrollbereichsgrenzeAbbildung 2

Stra

sse

K7



Außenbereich NO (2003)

0

20

40

60

80

100

0 0 0 1 10 100

Grenzwertausschöpfung uneingeschränkte Freigabe

Tief

e in

cm

MP 16-1 MP 17-1 MP 19-1 MP 16-2 MP 17-2 MP 19-2




















area between buildings








area between buildings: surface contamination measurement

Bothe: Release of Buildings and Sites at VKTA RossendorfCo-60 Cs-137 Eu-152 Eu-154

FE

B

A

CD

area between buildings: in-situ gamma-spectrometry


metal chip with Co-60


1310

O O

1410

1 15 153 10 25

16 2 15 2510 5 2515

O 2010

19 1525252525

17151025

54

71

2110

O

84

9 101 1

11

F

E

B

C

D

RKS 21

-200,00

-150,00

-100,00

-50,00

0,001 10 100

Bruttozählrate [Ips]

Tiefe

[cm]

RKS 10

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 11

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 8

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 5

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 17

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 19

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 16

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 13

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 20

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 15

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 14

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 9

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 7

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 1

-200,0

-150,0

-100,0

-50,0

0,01 10 100


Tiefe

[cm]

RKS 2

-250,0-200,0-150,0-100,0-50,00,0

50,01 10 100


Tiefe

[cm]

area between buildings: gamma-logging, sampling and analysis

25252525

3



Waste treatment centre•treatment and storage of solid radioactive waste•collection, treatment, storage for decay of radioactive waste waters

• reactors• isotope production facility• radionuclide laboratories

•in operation 1957 - 1999


99

N

3 0 . 8

controlled arearea for release

neutralisation facilitystorage pond waste water

taks

solid waste storage



• Decommissioning complex 3Decommissioning complex 3Decommissioning complex 3Decommissioning complex 3


neutralisation facility


storage pond


Grundwasserstand [GE97]

Geländeprofil

1

3

2

6 bzw. 7

4 bzw. 5

0 m2

6

9,4 m

77,5

0,5

1

6

2 4 bzw. 5

3

7

32,5 m20,5 m

contamination at storage pondwaste treatment centre


ground water level

ground surface 0 m

6 m

9,4 m

contamination sourcediffusearea

situation at storage pondwaste treatment centre


variability of specific activity [Bq/g]

nuclide contamination source diffuse area

Co-60 0,1 – 4,0 0,08 – 1,0Sr-90 0,3 – 0,5 0,3 – 9,0Cs-137 0,2 – 9,0 0,08 – 1,0

contamination: deep seated, difficult to accessactivity distribution: very heterogeneous, diffuse areas

contamination sources below the buildingnuclide vector: source: relatively uniform

soil profile: very variabletotal activity in the soil: ca. 500 MBq


situation at storage pond



options:1.according GRPO § 29 (1)

• clearance levels of GRPO Annex III Table 1• total demolition of building structures• removal of huge amount of contaminated soil• release measurements after removal

2.new conception according GRPO § 29 (2)• release limits according de-minimis conception• release measurements of buildings in-situ• release measurements of soil around buildings


description of the area

radiological monitoring

after remediation

conception for determination of soil

contamination

model calculation for 10 µSv/a-release criterion

knowledge about radiological situation


establish site specific release limits



establish site specific release values•additional conditions

• contouring of the area under consideration of• runoff of surface water• stability

•evaluation criteria• compliance with de-minimis-conception• technical feasibility• authorisation• costs• aspects of environmental and radiation protection



establish site specific release limitsconditions in the new conception:•use limitations for 50 years (e.g. no agriculture) •removal of all tubes•release values as limits not as guidance•final status survey•inventory of Sr-90•internal release procedure•covering layer of unaffected soil•monitoring program for surface water and groundwater



general clearance values and site specific release limitsnuclide Germ. Rad. Protect. Ordinance new conception

clearance values for unconditional clearance [Bq/g]

release limits for soil in-situ [Bq/g]

excavated soil(column 6)

soil surfaces(column 7)

near surface(< 30 cm)

subsurface(> 30 cm)

Co-60 0,09 0,03 0,64 90Sr-90 2 0,002 0,15 40Cs-137 0,4 0,06 0,20 2,80



establish site specific release limitsAugust1999 discovery of contamination under the storage pondApril 2001 conception by VKTAApril 2002 expert opinionMay 2002 application of admission to authorityJune 2003 general confirmation from the authorityAugust 2003 allowance for the first remediation project


waste water neutralisation facility

• 1969 to 1999• clean radioactive water

with ion exchanger



waste treatment centre – storage pond




















Thank you for attention!

Documents

08 Bothe - Release of Buildings and Sites at VKTA Rossendorfx · 2010. 11. 23. · Bothe: Release of Buildings and Sites at VKTA Rossendorf 13 10 O O 14 10 1 15 15 3 10 25 16 2 15