Liquid Wall Thickness, Life, Pumping Power, COE trade-offs Wayne R. Meier and Ryan P. Abbott LLNL ARIES Meeting Oct. 2-5, 2002 PPPL.

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Presentation transcript:

Liquid Wall Thickness, Life, Pumping Power, COE trade-offs Wayne R. Meier and Ryan P. Abbott LLNL ARIES Meeting Oct. 2-5, 2002 PPPL

Overview HYLIFE-II design goals Examining COE for Reduced liquid shielding thickness Lower radiation damage limits

It keeps going and going and… HYLIFE-II design goals: Protect solid structures for full plant life Low activation with ordinary steels Reduce material development needs

A blasphemous question What is the impact on COE of reducing the liquid wall thickness resulting in reduced first wall life and the need for periodic replacement? Reducing liquid shielding thickness and wall life competing effects: (+) Reduces pumping power (+) Reduces cost of circulating pumps (-) Reduces plant capacity factor (-) Increases remote maintenance equipment cost (-) Increases component replacement cost

Assumptions / Approach Detailed model of flow rate and pumping power as function of effective shielding thickness (= geometric thickness of liquid pocket  50% liquid packing fraction) was used Cost for recirculating pumps proportional to total flow rate Remote maintenance costs increased by 50% ($100M  $150M direct cost) Capacity factor as a function of FSW life and replacement time First wall replacement cost = $22M (½ cost of entire chamber) Other annual O&M costs proportional to plant capital cost (3% of direct cost, standard fusion costing assumption)

Base case parameters 0.56 m effective thickness (1.12 m at 50%) 58 MWe pumping power 30 yr wall life (no replacement) 85% capacity factor based on normal plant maintenance requirements

Wall life vs. shielding thickness Base case 100 dpa limit: 0.56 m  30 yr 0.40 m  10 yr 25 dpa limit: 0.76 m  30 yr 0.60 m  10 yr

Pumping power vs. FSW life and dpa limit 25 dpa limit: 30 yr  128 MWe 10 yr  68 MWe Base case 100 dpa limit: 30 yr  58 MWe 10 yr  33 MWe

Capacity factor vs. first wall life and replacement time Note: -Model assumes any life between 15 and 30 yrs requires 1 FW replacement - We assume replacement time of 3 month in following results

COE vs. FSW life for different damage limits dpa limit: >10 yr life gives COE within ~ 4% of 30 yr case - 25 dpa limit: 30 yr  COE +10% 10 yr  COE +7.5%

COE vs. replacement time for 5 and 10 yr wall lifetimes - If wall lasts 10 yrs and takes 6 months to replace, COE only increases by 5%. - But that may exceed acceptable plant down time for utility.

Conclusions COE effects due to decreasing liquid shielding and/or radiation damage limits have been examined Using current cost scaling models, 30 yr life does give minimum COE. However, wall life >10 yr have < 4% increase in COE for 100 dpa limit. With lower damage limit of 25 dpa, COE increase by % for wall lifetimes of 10 and 30 yrs, respectively. What is “marketing” value of 30 year chamber?