at Barsebck 1 and 2 Niklas Bergh Westinghouse Electric Sweden NKS - PowerPoint PPT Presentation

Dismantling of the RPV and Internals at Barsebäck 1 and 2 Niklas Bergh Westinghouse Electric Sweden NKS Seminar 2010 Studsvik 14 September 1

Agenda  Introduction  Background  Segmentation  Waste management  Time schedule  Staffing  Conclusions 2

Introduction  Barsebäck 1 and 2 (B1 & B2)  ASEA-Atom BWR:s  Electrical effect 620 MW  B1 closed 1999  B2 closed 2005 Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 3

Background  Basis for strategic decision: Handling of RPV and Internals • One-piece removal • Segmentation  Determine volumes for the expansion of SFR  Define year for placement of segmentation contract Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 4

Segmentation methods  Thermal techniques • Plasma Arc Cutting • Oxy-fuel Cutting • MDM  Mechanical techniques • Shearing • Band sawing • Circular sawing  Other • Abrasive Water Jet Cutting Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 5

Segmentation methods – pros and cons  Thermal techniques • Fast • Costly • Radiation and visibility issues  Mechanical techniques • Minor secondary waste • Easy to install • Reliable • Limited cutting thicknesses Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 6

Internals segmentation  Mechanical cutting program recommended due to extensive Westinghouse experiences  Wet segmentation in internal parts pool using band saw, shear, tube cutter and circular saw  Waste packed in the pool  Done in parallel for B1 and B2 Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 7

RPV segmentation Head 1,4 m 1  A combination of dry thermal and 2,0 m 2 wet mechanical cutting 1,8 m 3  Bottom modified for filling/draining 2,0 m 4  Auxiliary support systems installed 2,0 m 5  PAC used to cut annular pieces from the RPV 2,0 m 6  Height of annular pieces < 2 m, 1,6 m 7 avoiding nozzles 2,0 m 8 Bottom Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 8

RPV segmentation  Holes made with MDM/drill for lifting of the rings  Annular pieces moved to internal parts pool  Further segmented with band saw and packed into containers  Done in series for B1 and B2 to utilise lessons learned Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 9

Packing  Goal: Achieve optimal packing of containers to reduce costs  Previous Westinghouse experience: • Internals • 0.4-1.1 ton/m 3 • RPV • 1.0 ton/m 3 Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 10

Activity contents  Long-lived to SFL: • Core grid • Core shroud • Core shroud cover • Core spray • Part of control rod guide tubes  The rest to SFR Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 11

Containers  BFA-tank • 1.3 x 2.3 x 3.3 m • For long-lived LILW  Large Steel Box • 1.2 x 2.4 x 2.4 m • For short-lived ILW  ISO Container • 6.1 x 2.4 x 1.3 m • For short-lived LLW Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 12

Time schedule  Prerequisites: 3 shifts 24 hours per day  Internals segmentation done in parallel for B1 and B2  RPV segmentation done in series for B1 and B2  Design & manufacturing phase 2 years  Segmentation campaign 2.5 years Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 13

Staffing  Manpower on site during the different phases: • Crew of 11 during the internals segmentation • Crew of 14 during the RPV segmentation  Functions: • Project management • Engineers (Installation, quality and technical lead) • Operators (Tools and crane) • Decontamination • Health physics • Supervision Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 14

Conclusions  Proven technology available for segmentation of RPV and Internals  The contract for segmentation should be placed no later than 2017 in order to start establishment on site 2020  Total waste amounts: • 220 m 3 in SFL • 1 360 m 3 in SFR Waste Introduction Background Segmentation Time schedule Staffing Conclusions management 15