Effects of alternate pH control additives on PWR secondary cycle chemistry: Final report
Use of morpholine as a pH control additive at Prairie Island and Beaver Valley significantly reduced iron levels in the condensate and feedwater. This impact is attributed primarily to the increase in liquid film pH in two-phase regions as a result of the lower steam/liquid distribution coefficient of morpholine compared to ammonia. Although results indicate that morpholine does not increase blowdown removal efficiency compared to ammonia, the reduction in feedwater iron transport is sufficient to significantly reduce sludge buildup in the steam generators. Decomposition of morpholine leads to formation of formic and acetic acids which increase blowdown cation conductivity. However, the observed increase is less than 0.2 uS/cm, and the sensitivity of cation conductivity to strong acid anions does not decrease significantly. Use of 2-amino-2-methyl-l-propanol and dimethyl-amino-propanol (AMP-DMAP) as an alternate pH control additive at Fort Calhoun (approximately 0.4 ppM in the feed-water) had no significant beneficial effect on corrosion product transport compared to ammonia. In addition, acetate concentrations and the elevation in cation conductivity were much greater than the use of morpholine at Beaver Valley and Prairie Island.
- Research Organization:
- NWT Corp., San Jose, CA (USA)
- OSTI ID:
- 5580437
- Report Number(s):
- EPRI-NP-5594; ON: TI88920214
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210200* -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
AMINES
BOILERS
CHEMISTRY
COOLING SYSTEMS
CORROSION INHIBITORS
DATA
DOCUMENT TYPES
ELEMENTS
ENERGY SYSTEMS
ETHERS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
IRON
METALS
MORPHOLINES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PH VALUE
PROGRESS REPORT
PWR TYPE REACTORS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
SECONDARY COOLANT CIRCUITS
SLUDGES
STEAM GENERATORS
TRANSITION ELEMENTS
VAPOR GENERATORS
WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS