The Oak Ridge National Laboratory Gas-Cooled Reactor, Part 3: Plant Design Page: 6-27
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6.27
TABLE 6.4. COST COMPARISON - BLOWER AND DRIVE ARRANGEMENTS
20-Year
Installed 20-Year Power Cost 20-Year
Cost Per Investment Per Loop at Total Cost
Arrangement Loop Cost Per 10 mills/kwhr for Four Advantages Disadvantages
($) Loop at 14% and 85% Load Loops
($) c$)1. Constant-Speed Drive Contained Within Helium
System, Controlled Bypass
Blower (overhung from motor shaft)
Bypass piping (including valve and actuator)
Containment vessel for blower and motor
Motor, squirrel cage, 6000 hp, 3600 rpm
Total
2. Constant-Speed Drive in Air with Shaft Seal,
Controlled Bypass
Blower (mounted on separate shaft)
Bypass piping (including valve and actuator)
Containment vessel for blower
Motor, squirrel cage, 6000 hp, 3600 rpm
Coupling, one required
Helium shaft seal
Helium leakage through shaft seal
Total
3. Variable-Speed Drive (Hydraulic Coupling) in Air
with Shaft Seal
Blower (mounted on separate shaft)
Hydraulic coupling (equipment cost $65,000)g
Speed-control instrumentation
Containment vessel for blower
Motor, squirrel cage, 6000 hp, 3600 rpm
Couplings, two required
Helium shaft seal
Helium leakage through shaft seal
Total
4. Variable-Speed Drive (Direct-Coupled Steam Turbine)
with Shaft Seal
Blower (same as arrangement 2)
Containment vessel for blower
Turbine (equipment cost $150,000)
Speed-control instrumentation
Helium shaft seal
Coupling, one required
Helium leakage through shaft seal
Auxiliary steam plant (one-blower capacity) for
startups ($700,000 initial cost plus $1,960,000
20-year capital costs)
Total
5. Variable-Speed Drive (Direct-Coupled D-C Motor
with Motor-Generator Set and Ward-Leonard
Control) with Shaft Seal
6. Variable-Speed Drive (Squirrel-Cage Motor with
Magnetic Coupling) with Shaft Seal
7. Constant-Speed Drive (Synchronous Motor) with
Shaft Seal and Controlled Bypass250,000a
25,000
50,000
202,000b
527,000 1,476,000 7,018,000 36,080,000
280,000a
25,000
35,000
152,000c
1,000
32,000d 7,018,000
30,000e
525,000 1,470,000 7,048,000 36,170,000
290,000/
72,000
5,000
35,000
152,000c
2,000
32,000d 7,228,000
30,000
588,000 1,646,000 7,258,000 37,970,000Most simple arrangement; all Poor maintenance access to motor;
equipment essentially development necessary for motor
standard and reliable; high lead entry into containment
efficiency at full volumetric vessel
flow; no helium shaft seal
required
Equipment other than shaft Helium shaft seal required (shaft
seal essentially standard seal maintenance costs not in-
and reliable; good main- cluded in this table)
tenance access to motor;
high efficiency at full
volumetric flowEquipment other than shaft Blower speeds may be difficult
seal essentially standard to synchronize; small increase
and reliable; good main- in blower cost over arrange-
tenance access to motor; ment 2; helium shaft seal re-
more efficient at less-than- quired (shaft seal maintenance
full volumetric flow than costs not included); approxi-
arrangements 1 and 2 mately 3% efficiency loss at
full load; difficulty may be
encountered in sequence
startingEquipment other than shaft Blower speeds may be difficult
seal essentially standard to synchronize; difficulty ex-
and reliable pected in sequence starting;
helium shaft seal required
(shaft seal maintenance costs
not included)280,000
35,000
173,000b
5,000
32,000d
1,00030,000
526,000 1,473,000 6,350,0001 36,060,000
Cost is excessive; 20-year total cost for four loops ap-
proximately $7,000,000c above that for arrangement 1,
2, 3, or 4Cost is excessive; 20-year total cost for four loops ap-
proximately $4,000,000c above that for arrangement 1,
2, 3, or 4Less reliable than any of the
above; requires speed in-
creaser between motor and
blower for 3600 rpm
Not available at required
horsepower; would be similar
in performance to hydraulic
coupling
Requires squirrel-cage starting
motoraBased on $500,000 development cost plus $150,000 per blower for five blowers. Blowers mounted on separate shaft cost $30,000 additional.
bEquipment costs from Westinghouse Electric Co. verbally; includes modification for enclosed operation and direct mounting of blower and also installation cost.
CEquipment costs from Westinghouse Electric Co. verbally; includes installation costs.
dPersonal communication from W. F. Boudreau. Based on $150,000 development cost plus $2000 per seal for five units.
eCorresponds to 0.8-scfh leakage at $0.0227 per scf.
/Blower diameter increased to regain tip speed lost by coupling slip.
8Equipment cost from American Blower Corp. verbally.
hEquipment cost from Westinghouse Electric Co. catalog.
ZAuxiliary steam plant will operate one blower only. Reactor must provide power for remaining blowers.
I90% of electric power costs.
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Oak Ridge National Laboratory. The Oak Ridge National Laboratory Gas-Cooled Reactor, Part 3: Plant Design, report, January 4, 1958; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc100273/m1/37/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.