Case Study Material management & treatment

Transcription

1 Case Study Material management & treatment Axel Bäcker

2 Material management & treatment - Overview Mg Atomic Law

3 Material management & treatment - Categorisation What is to do? 1 Find out : Contaminated and not contaminated areas Different contamination levels Nuclide vectors How to do it? Facility characterization is one of the basic tasks of decommissioning 1) HSA 2) Inventory 2 Categorize all material: Category 1 - unrestricted material Category 2 - suspected material Category 3 - contaminated material

4 Material management & treatment Categorisation of masses NPP Greifswald Mg Not radioactive material Category 1 ~ Mg Radioactive material Category 2 and 2 and 3 3 ~ ~ Mg Mg 2 / 3 1 / 3 Plant parts TH 1-6, CA 6 ~ Mg Building structure ~ Mg Plant parts TH 1 5, IH 1-5 ~ Mg Building Building Structure and structure concrete Mg ~ Mg

5 Material management & treatment Disposal way category 1 (not radioactive) NPP Greifswald Mg Category 1 ~ Mg (~ Mg) Category 2 and 3 ~ Mg Control measurement to prove the contamination absence Controls by Independent experts (take samples) Release by KGR (without authority) Disposal to scrap dealer, waste dump, incinerating plant...

6 Material management & treatment Disposal goals (ways) category 2 and 3 (radioactive material) KKW Greifswald Mg Category 1 ~ Mg Category 2 and 3 ~ Mg Decay Decay storage storage Radiological control measurements Measurements D E Reuse Use or reuse utilisation in in nuclear facilities Disposal as as radioactive waste F Unrestricted release A FMK Free release (Authority is involved) Restricted release or Restricted release or disposal as disposal as conventional waste in conventional waste accordance with the RPO Special disposal aims Special valid disposal for free release aims in KGR B C

7 Material management & treatment Masses and disposal goals (plan) NPP Greifswald Mg Category 1 ~ Mg Category 2 and 3 ~ Mg Building structure and concrete ~ Mg Plant parts & others ~ Mg ~ Mg A, B, C ~ Mg 90 % ~ Mg D ~ Mg ~ Mg E 6 % 1 % ~ Mg F 68 % 3 % 6 % 23 % 3 % IAEA Workshop on Decommissioning Planning and Licensing, Karlsruhe/Germany November 2012

8 Material management & treatment Waste management practise Information in pre checking document (Dismantling project) Material in package Current information on dismantling place (radiological, material) Cutting necessary? yes no Free release measurement facility/area yes Measurable for free release? no Results lower than the limit values? no Decontamination possible? yes Central Warm Workshop (CWW) yes no Disposal after free release A, B, C Decay storage make sense? no yes Interim Storage North (ISN) D, E Buffer places Conditioning necessary? Yes Controlled area in the units Repository F

9 Thank you for your attention! IAEA Workshop on Decommissioning Planning and Licensing, Karlsruhe/Germany November 2012

10 Material management & treatment Buffer places 14 buffer places in the area (approx Mg) ISN (approx Mg)

11 Material management & treatment Kinds of packages Boxes Drums 20 Container (11 500) (13 000) (2 000) Skip container (520) Concrete and steel container Material without a cover (480) (69)

12 Material management & treatment Buffer places 14 buffer places in the area (approx Mg) ISN (approx Mg)

13 Material management & treatment Free release measurement facility Acceptance criteria Surface contamination < 1.0 Bq/cm² Dose rate < 0.5 µsv/h (measure distance 10 cm) Measured mass : Mg ~ 130 packages per day in the free release measurement facilities

14 Material management & treatment Central Warm Workshop Acceptance criteria - Surface contamination - 4,0 Bq/cm² Dose rate Distance 2 m (for cable) 5 µsv/h Distance 2 m (all others) 100 µsv/h - Different cutting methods - Different decontamination procedures - Washing machine for cable - Peeling of cable

15 Material management & treatment Interim Storage North Drying facility Band saw High pressure compactor Scrap shear

16 Material management & treatment Controlled are in the units Drying facilities Drum filling station - drying of resins Rotation thin film evaporator (RDVA) Sorting station for solid waste Chamber filtration plant for slug