TFTR D&D ALARA PLAN FY00 thru FY02

December 3, 1999

Presented By: James H. Chrzanowski

TFTR D&D ALARA PLAN

• This presentation will review for the ALARA committee those D&D activities being planned for the three year plan, including:– Assumptions made in determining dose estimates– General task descriptions– Estimated personnel exposure for each D&D task– Controls which will be used

• The safety and protection of the work force will be the primary concern during the D&D Removals

• Integrated Safety Management (ISM)

TFTR D&D ALARA PLAN

• The TFTR D&D Project Mission is to:– Surgically remove items which can be re-used

within the DOE complex– Remove Tritium contaminated and activated

systems for disposal– Clear the Test Cell of hardware except for the

Neutral Beams and their sources– Reclassify the D-site complex as a non-nuclear

facility as defined in DOE Order 420.1 (“Facility Safety”)

– Provide data on the D&D of a large magnetic fusion facility

TFTR D&D ALARA PLAN

• How dose estimates were developed:

• Dose rates based upon surveys performed this Summer and Fall.

• Man-hours were based upon estimates developed by engineering for the D&D Project

• Estimates were conservative

• No credit was taken for the use of shielding, even though shielding will be used wherever possible

• Activities whose estimated dose were less < 1.0 mrem were discounted from totals

TFTR D&D ALARA PLAN

SURVEY DATA - Top of umbrella structure 0.8-1.0 mrem/hr. - Midplane adjacent to TF coil 5.0 mrem/hr. - At edge of 102-ft. elevation 0.8 mrem/hr. - Vacuum Vessel on contact 25-35 mrem/hr.

- At yellow fence 0.16 mrem/hr.

TFTR D&D ALARA PLAN

Activity No. Task Description FY Estimated Exposure Dose Rate Total Estimated

Activity Man-Hours mrem/hr. Exposure (mrem)

2.4.1 - TOKAMAK REMOVAL241-2010 Remove upper cable trays,conduits & junction boxes FY01 480 hrs. 1.0 mrem/hr 480 mrem241-2020 Remove all conduits &cables below Umbrella Structure FY00 160 hrs.241-2060 Disconnect & remove coil/bus cooling lines FY00 80 hrs. 1.0 mrem/hr 80 mrem241-2030 Disconnect/remove all cooling lines/flow meters FY00 240 hrs. 5.0 mrem/hr. 2400 mrem241-2040 Remove VV Heating/Cooling pipes FY00 500 hrs. 1.0 mrem/hr 500 mrem241-2050 Remove MIRI Structure FY00 240 hrs. 1.0 mrem/hr 240 mrem241-2070 Remove upper PF/TF Bus runs and supports FY00 320 hrs. 1.0 mrem/hr 320 mrem

Primavera Activity No.

Man-hours to complete task

Dose-Rate/Hour

Sample Dose Estimating Table

TFTR D&D ALARA PLAN

• Steps Taken to Minimize Exposure– Experienced personnel will be used for critical tasks such as

vacuum interface/line breaks

– Lead shielding will be used whenever possible

– Disassembly sequence

– Special tools

– Pre-job Briefings

– Post-job Briefings

TFTR D&D ALARA PLAN

• Contamination Issues

– Personnel shall wear protective clothing/equipment as determined by Health Physics

– Elephant trunks, gloveboxes, etc. shall be used to contain airborne contamination

– Each procedure requires HP to survey/smear area prior to starting work to determine working condition

TFTR D&D ALARA PLAN

• FY BREAKDOWN• FY00 -Area preparation, initial diagnostic removals, Tokamak

removals on top of umbrella structure

– Minimal expected personnel dose• FY01- Majority of Diagnostic line breaks, pump duct removals,

vacuum vessel entry, start of contaminated basement vacuum line removals, prep and concrete fill VV

– Highest expected personnel dose• FY02 – Umbrella structure removal, Diamond cutting of VV and

close vessel work

– Reasonably high personnel dose

TFTR D&D ALARA PLAN

• PROJECTED DOSE SUMMARY• (Conservative estimates)R1

• FY00 …………………. 4.1 Rem• FY01 …………………. 13.9 Rem• FY02 …………………. 6.6 Rem • D&D Projected Total= 24.6 Rem

TFTR D&D ALARA PLAN

• ESTIMATED DOSE COMPARISON

• D&D Project……………………….. 24.6 Rem

• 1996 TFTR Outage (requested) ….. 13.7 Rem

• 1996 TFTR Outage (actual) ………. 5.05 Rem

– (internal & external values)