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36. Meeting in Lyon (27./28.03.08)
Agenda
TOP 1: Modelling of degradation mechanism of hydropower generator
TOP 1: Modelling of degradation mechanism of hydropower generator
The EDF French hydroelectric fleet which represents an installed capacity of approximately 20 GW, is old (average age higher than 50 years) and diversified (more than 500 power stations). The maintenance of its current performances and the management of the asset value require the knowledge of the equipment actual state so as to envisage the necessary restorations and renovations. That requires to define indicators which will make it possible to determine the actions to undertake and to assess the future costs.
TOP 2:
Presentation of CNR
Christophe Turbidi, CNR
CNR was created in 1933, and entrusted by the French government the concession of the Rhône in 1934. It is a “société anonyme” (limited Cie) with general interest. It is an independent electricity producer that has marketed its energy since April 2001.
The company manages 18 barrages, 1 dam, 19 hydropower plants (3000 MW) and 14 wide gauge locks on the river.
The Company's capital is composed of mostly public shareholders and a private partner, the company Electrabel (
The presentation can be found in the closed user group.
TOP 3:
Return of experience on Wind turbines
Yves DeMulder, Laborelec
Today, Electrabel already has more than 5,500 megawatts (MW) of capacity generated from renewable sources, of which 655 MW comes from wind farms in
Due to the huge demand, wind turbines are developed and produced at high speed, which might have some consequences for the end users. Together with the fact that they represent a very large number of rather small power islands, generally hard to access, managing the follow-up and maintenance of them needs a high dose of creativity.
Therefor users should share their experiences as much as possible, about the wind turbines themselves as about the manufacturers. The presentation deals with 3 main issues: oil problems, ice fall and generator failures.
The presentation can be found in the closed user group.
TOP 4
Engineering risk management
Paul Thame, EON
Most of the coal fired generating units in
To ensure that safety levels do not deteriorate, the
In addition, E.ON
The presentation can be found in the closed user group.
TOP 5:
Experience with NON OEMS for Gas Turbines
Henning Lundstrom, Vattenfall
The presentation stated the principles of using non OEM suppliers for the Vattenfall Power stations in
Vattenfall in
A result of the discussion at the PGMON meeting was that you must be very much aware of the extent of complexity when ordering reverse engineering products from a non OEM. The very complex first row blade in a gas turbine is obviously close to the limit.
The presentation can be found in the closed user group.
TOP 6:
Operational Risk Review of a 60 MW Boiler
Richard Sheehan, John McManus, ESB
Following a number of leaks in a 60MW boiler in late 2007, Power Generation commissioned a risk review to assess the current condition of the boiler and identify what measures, if any, were needed to ensure the continued safe operation of the boiler for its short remaining economic life. The review involved a comprehensive assessment of the condition of the boiler, including identifying potential failure mechanisms, the likelihood and consequence of such failures and the identification of any additional control measures. The review also necessitated engineering calculations to ensure that the control measures were in line with acceptable practice.
To ensure continued safe operation of the boiler up to its planned closure date, the review recommended: -
The threshold pressure of 20 bar at which the exclusion zone comes into operation is conservative and may be reviewed into the future.
The presentation can be found in the closed user group.
TOP 7:
Sampling maintenance
Celia Domecq, EDF
The existence of similar equipment which are identically maintained and operated makes possible to constitute homogeneous technical equipment families. The selection and the thorough control of a reduced number of pilot equipment within these families, can in certain cases replace the overhaul inspections which should have been carried out on the totality of the equipment. EDF has implemented this innovative condition-based maintenance strategy on its nuclear fleet. To help the implementation of this strategy of preventive maintenance, EDF R&D has developed a method to choose the pilot equipment in order to control the risk of failure on the equipment which are inspected. This method allows, according the case:
This maintenance strategy has been implemented on about 17 equipment families on the nuclear plants fleet of EDF, particularly on stand-by rotating machines, valves and electrical components.
The presentation can be found in the closed user group.
TOP 8:
Assessment of Start Reliability for the
Dr. Lynn Gilbert, RWE npower
In response to commercially volatile market conditions requiring an increased level of plant flexibility, a study was carried out to try and assess what level of flexibilty the
When examining the relationship between the number of starts and the overall plant availability, the expected link between more frequent starts and lower availability (due to increased plant degradation) could not be demonstrated from this data.
Further information on planned and unplanned availability could be used to demonstrate any link with increasing breakdown rates or
changes in the inspection & overhaul programme.
Lastly, the data showed a link between number of starts and utilisation. Plant undertaking a higher number of starts per year generally had lower utilisation, indicating that they switched off when out of cost and restarted more to capture the best market conditions.
This demonstrates the
increasing commercial requirement to be more flexible in the
The presentation can be found in the closed user group.
TOP 9:
LTSA experiences
Henk Wels, NRG
In the
One way to assist in the decision making is a comparison with other contracts for CC within the utility. As contracts differ in scope, duration, responsibilities etc., they should be made comparable for instance in operating profile (starts, operating hours, equivalent hours), duration (number of overhauls, Major Inspection versus smaller inspections, etc). To this respect a spreadsheet analysis program was made by NRG & KEMA covering operating profile, risk on spare parts necessary due to crashes during reconditioning (using queuing theory), scrap rate, costs of spares and total overhaul costs. The analysis program shows the dominant factors covering the maintenance costs per MWhr produced as well as statistical boundaries for such costs. It can be used to make LTSA proposals comparable.
The presentation can be found in the closed user group.
TOP 10:
Application of the PLUS and ERAP processes into the RWE npower Maintenance and Engineering Strategy
Alan Joslin, RWE npower
The Plant Life Usage System (PLUS) and the Engineering Risk Management Process (ERAP) were introduced by RWE npower and its predecessor organisations about ten years ago, and have since been developed into processes that are integral with RWE npower's engineering strategy.
Both processes are resource intensive.
For example, undertaking a PLUS assessment of a typical large coal-fired power station and reporting the results could involve about 40 man-days of work.
Therefore, although the output from PLUS and ERAP is recognised as being of high value, until recently they have been conducted at frequencies of only every four years on each power station, broadly to fit in with the four-yearly major overhaul programme.
This presentation includes some outline requirements for basic maintenance strategies, and goes on to discuss how the PLUS and ERAP engineering tools have been developed to enable undertaking annual reviews, and two-yearly interim studies.
These require much less specialist and station resource to undertake, yet provide the majority of the value to the broad engineering
strategy of the station that comes from the four-yearly full studies.
Utilising these developments, RWE npower have now introduced the annual PLUS and ERAP reviews at all its major power stations. The presentation includes examples of the outputs from the interim and annual studies.
The presentation can be found in the closed user group.
TOP 11:
Place and date of next venue
The next meeting will be held on 11/.12. September 2008 in
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