PWR Secondary Side Chemistry
Consulting
Optimum chemical conditions of the secondary side to prevent and reduce detrimental
phenomena
High availability and reliable operation of nuclear power plant are the searched goals by the
operator. Water chemistry plays an important
role on the performance and on the preservation of the secondary side components against
corrosion degradation phenomena. The most
effective way of counteracting all degradation
problems and thus of improving the SG performance is to maintain clean conditions.
The material and design concept of the plant let
the operator the degree of freedom of chemistry to
adopt the suitable treatment to preserve the system
clean. AREVA’s recommendations lead to the best
suitable operational conditions which facilitate the
reduction of:
• corrosion phenomena as FAC
• ingress of corrosion product inventory and
impurities into the steam generator
• time of response against abnormal situations
AREVA consulting team supports the plants to
achieve the optimal chemistry strategy by:
• Evaluation of the chemical parameters and
comparison with other plants
• Assessment of data plausibility and consistency
• Monitoring the of steam generator conditions
and evaluating the steam generator situation
• Setting concepts which reduce the impurity and
corrosion product levels in the system during
annual outages
• Supporting the plant to re-establish the clean
condition
• Plant staff training in trouble solving for daily
operation
• Revision of chemistry guidelines
The pro-active maintenance measures can be
complemented with on site support in order to gain
time by solving technical problems during start-up
or operation.
Water Chemistry Data
Inspection Results
Thermal Performance
(e.g. iron ingress, hide-out)
(e.g. visual, sludge mapping)
(e.g. heat transfer)
Steam Generator Assessment
No measures required
Measures required
Steam Generator Cleaning
Preventive Chemical Cleaning
Curative Chemical Cleaning
Mechanical Cleaning
(e.g. Tube sheet and/or inner bundle lancing, upper bundle flushing)
Improvement of Water Chemistry
Continuous Steam Generator Surveillance
AREVA’s integrated concept for steam generator assessment and surveillance
PWR Secondary Side Chemistry Consulting
Overview of latest AREVA projects
• Chemistry support for steam generator replacement of a plant in Westinghouse design
• Frequent on-site chemistry support for minimization of corrosion product generation and transport
• Regular steam generator cleanliness assessments for German and International PWRs
• (On-site) Plant support during conversion of
2 PWRs to H-AVT chemistry treatment
• On-site training for water chemistry staff
• R & D project on water chemistry treatment with
focus on lay-up
• Contribution to IAEA TecDoc 1668, “Assessment
and Management of Ageing of Major Nuclear
Power Plant Components Important to Safety:
Steam Generators”
Further AREVA products
• Database of qualified products for maintenance work and during outage
• Diagnosis Monitoring System
• PWR Primary Side Chemistry Consulting
• BWR Chemistry Consulting
• PHWR Chemistry Consulting
IMPURITY CONCENTRATION IN
CREVICE
TS-DEPOSITS
Spent
Solvent
Spent
Solvent
Fresh
Solvent
Impurity enrichment in the steam generator
Flow Assisted Corrosion (FAC)
Your Benefits at a Glance
• AREVA international experience covers plant designs of various OEMs
• Knowledge of manifold chemistry treatments and chemistry guidelines
• State-of-the-art chemistry measures applied at AREVA’s EPRTM
• Tailored plant specific studies in close cooperation with operators fitting your
needs and requirements
AREVA NP GmbH
Your contact: NPP-Chemistry@areva.com
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These statements, even if they are future-oriented, are based on information that was available to us at the date of publication. Type, quantity and characteristics of goods and services
G-190-V1-12-ENGPB
are subject to formal individual formal contracts.