CN105260947A - Available rate evaluation method for design period of nuclear power station - Google Patents
Available rate evaluation method for design period of nuclear power station Download PDFInfo
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Abstract
An available rate evaluation method for a design period of a nuclear power station comprises the steps of S1, screening a system which may affect capital repair of a set; S2, screening equipment which cannot be quitted for maintenance in an RP mode and determining a maintenance window; S3, comparing each set of equipment with the equipment of a reference power station, using operation and operation empirical data of an equipment maintenance template/reference power station as reference data, making a preventive maintenance strategy of each set of to-be-analyzed equipment in the capital repair period according to an RCM analysis method; S4, according to the preventative maintenance strategy and the maintenance window, determining whether a maintenance item is a key path based on a time consumption coverage principle between maintenance items or between the maintenance item and a ROO material changing item, and computing basic time consumption in each type of capital repair based on the maintenance item which occupies the key path; S5, computing the available rate; and S6, determining whether the available rate satisfies a requirement. According to the available rate evaluation method, a quantitative evaluation for the nuclear power station is realized through computing the available rate. The available rate evaluation method is suitable for different newly built nuclear power stations without enough equipment operation and maintenance experience.
Description
Technical field
The present invention relates to nuclear power station reliability engineering field, particularly relate to a kind of available rate evaluation method for the nuclear power station design phase.
Background technology
Nuclear power plant's electrical production, centered by unit safety is reliable, take economical operation as target.Design available rate be weigh unit can the important indicator of economical operation.Available rate is higher, shows that unit reliability is better, can realize economical operation.Available rate assessment, it is considered that the economy problems of nuclear power plant, by correlation analysis and calculating, proves that the design available rate of power plant can reach the requirement of owner or industry standard.
The determination of existing design of nuclear power plant stage available rate is get with reference to external similar power station or domestic similar power station mostly, and without detailed assay.Wherein, the determination of the plan unavailable time of unit, the evaluation method that there is no quantification is available.For newly-built innovative variant nuclear power station, similar like this reference determines that related economic refers to calibration method and inadvisable; Again because design phase equipment lacks operating maintenance experience, do not possess enough related data accumulation, traditional Experience Feedback method is also difficult to be suitable for.
Summary of the invention
The technical problem to be solved in the present invention is, the defect can not be applicable to variant new nuclear power station and design phase equipment operating maintenance experience for the above-mentioned experience of prior art and feedback transmitter, not easily promoting, provides a kind of available rate evaluation method for the nuclear power station design phase.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of available rate evaluation method for the nuclear power station design phase, comprise the steps:
S1, from all systems of nuclear power station, filter out the system that may affect major overhaul;
S2, for the system filtered out in step S1, filter out and can not exit the equipment of maintenance as equipment to be analyzed under RP pattern, and determine the maintenance window of each equipment to be analyzed;
S3, each equipment to be analyzed to be contrasted with reference to the equipment in power station, select with the operating maintenance empirical data in equipment class maintenance template/reference power station as reference according to comparing result, by using RCM analytical approach to treat analytical equipment analysis, and then formulate the preventative maintenance strategy of each equipment to be analyzed between overhaul time and maintenance cycle;
S4, according to the maintenance window determined in described preventative maintenance strategy and step S2, based between maintenance items or whether maintenance items and ROO used time of reloading between project to cover principle determination maintenance items be critical path, calculate the basic used time of all types of overhaul based on the maintenance items taking critical path;
S5, calculate the number of times of all types of overhauls preset in year number according to described maintenance cycle, and according to basic used time of all types of overhaul and number of times and described default year number calculate the total available rate of unit;
Whether the available rate that S6, determining step S5 calculate meets the demands, and when not meeting the demands, is optimized nuclear power design according to the available rate calculated.
Of the present invention in the available rate evaluation method of nuclear power station design phase, comprise in step S2:
S21, judge systemic-function exit window, and then identify back-up system function equipment and determine equipment comprehensively exit window;
S22, comprehensively exit window according to described, the maintenanceability of equipment is judged, the equipment of maintainability can be defined as equipment to be analyzed completely by discontented, and determine the maintenance window of equipment to be analyzed.
Of the present invention in the available rate evaluation method of nuclear power station design phase, comprise in step S3:
S31, the function passing through the equipment in contrast equipment to be analyzed and reference power station and lectotype selection, judge the type of each equipment to be analyzed, the type of equipment comprises category-A and category-B;
If S32 equipment to be analyzed belongs to category-A, then the preventative maintenance strategy of corresponding device and maintenance cycle in incorporated by reference power station; Wherein, the preventative maintenance strategy in reference power station and maintenance cycle are with the operating maintenance empirical data with reference to power station for reference, and utilization RCM analytical approach carries out fault mode to equipment, failure effect analysis (FEA) is determined;
If S33 equipment to be analyzed belongs to category-B, then keep in repair template for reference with equipment class, use RCM analytical approach, treat analytical equipment and carry out fault mode, failure effect analysis (FEA), and then formulate the preventative maintenance strategy of each equipment to be analyzed between overhaul time and maintenance cycle.
Of the present invention in the available rate evaluation method of nuclear power station design phase, in described step S4, perform following steps respectively for every class overhaul:
S41, according to the maintenance window determined in step S2, the maintenance items in overhaul to be sorted;
S42, the maintenance items after sequence and the ROO project of reloading to be contrasted, if the used time of certain maintenance items can be covered by reload used time of project or other maintenance items of ROO, then judge that this maintenance items does not take critical path; Otherwise, judge that this maintenance items takies critical path;
S43, calculate basic used time of all types of overhaul based on the maintenance items taking critical path.
Of the present invention in the available rate evaluation method of nuclear power station design phase, the type of described overhaul comprises: short refueling outage, normal refueling outage, 10 years refueling outages.
Of the present invention in the available rate evaluation method of nuclear power station design phase, the available rate that unit is total is in step s 5 based on following formulae discovery:
E＝1-(T1*n1+T2*n2+T3*n3+T4+T5)/(365*N)
Wherein, E represents the total available rate of unit, and T1, T2, T3 represent the basic used time of short refueling outage, normal refueling outage, 10 years refueling outages respectively, and unit is sky; N1, n2, n3 represent the number of times of short refueling outage, normal refueling outage, 10 years refueling outages respectively; T4 is known parameters, and represent substantial equipment maintenance or change time delay, unit is sky; T5 is known parameters, and representative forces unavailable time, and unit is sky; Year number is preset in N representative.
Implement the available rate evaluation method for the nuclear power station design phase of the present invention, there is following beneficial effect: the present invention is in the nuclear power design phase, for the equipment that may affect major overhaul, formulate the preventative maintenance strategy of these equipment between overhaul time and maintenance cycle in conjunction with RCM analytical approach, and can cover based on the used time maintenance items that principle determines to take the basic used time of overhaul, and then the total available rate of unit can be calculated, this available rate achieves the quantitative evaluation to nuclear power station, avoid the limitation in the past relying on the method determination unit economy index with reference to power station Experience Feedback.Therefore the present invention be applicable to otherness and new nuclear power station that design phase equipment operating maintenance experience lacks, easy popularization, except having good applicability to the assessment of new nuclear power station design phase economic target, the present invention can also promote the use of the economic evaluation work of nuclear power station between total life cycle at the beginning of fortune, designed by otherness and innovative nuclear power station (as small-sized heap etc.) and economic evaluation research field at the beginning of fortune.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the process flow diagram of the available rate evaluation method for the nuclear power station design phase of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
The maintenance of nuclear power station comprises planned maintenance and unscheduled maintenance, the present invention is intended to by predicting in the time of design phase to the planned maintenance of nuclear power station, and then the total available rate of unit can be evaluated, this available rate may be used for the quantitative evaluation of nuclear power station.
With reference to figure 1, method of the present invention comprises:
S1, from all systems of nuclear power station, filter out the system that may affect major overhaul;
S2, for the system filtered out in step S1, filter out and can not exit the equipment of maintenance as equipment to be analyzed under RP pattern, and determine the maintenance window of each equipment to be analyzed;
S3, each equipment to be analyzed to be contrasted with reference to the equipment in power station, select with the operating maintenance empirical data in equipment class maintenance template/reference power station as reference according to comparing result, by using RCM analytical approach to treat analytical equipment analysis, and then formulate the preventative maintenance strategy of each equipment to be analyzed between overhaul time and maintenance cycle;
S4, according to the maintenance window determined in described preventative maintenance strategy and step S2, based between maintenance items or whether maintenance items and ROO used time of reloading between project to cover principle determination maintenance items be critical path, calculate the basic used time of all types of overhaul based on the maintenance items taking critical path;
S5, calculate the number of times of all types of overhauls preset in year number according to described maintenance cycle, and according to basic used time of all types of overhaul and number of times, calculate total servicing time of presetting all overhauls in year number, according to described total servicing time and described default year number, calculate the available rate that unit is total;
Whether the available rate that S6, determining step S5 calculate meets the demands, and when not meeting the demands, is optimized nuclear power design according to the available rate calculated.
Illustrate for certain newly-built pressurized-water reactor nuclear power plant below.
About step S2, it specifically comprises:
S21, reference " system handbook " file, what judge systemic-function (operation function OF/ security function SF) exits window, refer again to system flowchart identify back-up system function equipment and determine equipment comprehensively exit window;
As table 1, it is certain systemic-function attribute list.
Table 1
S22, comprehensively exit window according to described, the maintenanceability of equipment is judged, the equipment of maintainability can be defined as the input of equipment to be analyzed as next flow process completely using discontented, and determine the maintenance window of equipment to be analyzed.If following table 2 is equipment complex maintenance windows.
Table 2
Wherein, maintenanceability refers to carries out isolating the judgement that can reach to equipment, is specially: under the operating mode that judgment device can exit, and whether can carry out the isolation (can isolate) of minimum unit to equipment; And under judging the operating mode that can exit at equipment, maintenance tool/instrument and personnel can carry out maintenance (can reach) close to equipment.
Wherein, comprise in step S3:
S31, the function passing through the equipment in contrast equipment to be analyzed and reference power station and lectotype selection, judge the type of each equipment to be analyzed, the type of equipment comprises category-A and category-B;
Wherein, category-A equipment refers to that this equipment is all identical with type with the function with reference to power station corresponding device; Category-B equipment refer to this equipment with reference to the function of power station corresponding device or type not identical.As table 3, it is system equipment type identification table.
Table 3
If S32 equipment to be analyzed belongs to category-A, then the preventative maintenance strategy in incorporated by reference power station and the cycle; Wherein, the preventative maintenance strategy in reference power station and cycle are with the operating maintenance empirical data with reference to power station for reference, and utilization RCM analytical approach carries out fault mode to equipment, failure effect analysis (FEA) is determined;
If S33 equipment to be analyzed belongs to category-B, then keep in repair template for reference with equipment class, use RCM analytical approach, treat analytical equipment and carry out fault mode, failure effect analysis (FEA), and then formulate the preventative maintenance strategy of each equipment to be analyzed between overhaul time and maintenance cycle.
As table 4, the formulation table for preventative maintenance strategy:
Table 4
Wherein, RCM analytical approach refers to the maintenance analysis method centered by reliability, carries out function and fault analysis to system, specifies the consequence of each fault in system; By normalized logic decision method, determine the preventative countermeasure of each failure effect; By means such as field failure data statistics, expert assessment and evaluation, quantification modelings under the prerequisite ensureing security and integrity, to keep in repair the minimum maintenance policy for objective optimization system of shutdown loss.
After having formulated maintenance policy, need the basic used time to calculating all kinds of overhaul, because all kinds of overhaul comprises multiple maintenance items, but some maintenance items can be carried out simultaneously, or can carry out with ROO project of reloading simultaneously, so in all kinds of overhaul of calculating with constantly, need first maintenance items to differentiate, judge whether it may take overhaul critical path (namely affecting the basic used time of overhaul).
In described step S4, perform following steps respectively for every class overhaul:
S41, according to the maintenance window determined in step S2, the maintenance items in overhaul to be sorted;
Corresponding in fact different section servicing time of each maintenance window.The difference of the maintenance window of the equipment of therefore different maintenance items determines the sequencing of its maintenance.And in same maintenance window, the maintenance items of simultaneously carrying out may be there is, or with the maintenance items that ROO project of reloading is carried out simultaneously, therefore enter step S42 and judge.
S42, the maintenance items after sequence and the ROO project of reloading to be contrasted, if the used time of certain maintenance items can be covered by reload used time of project or other maintenance items of ROO, then judge that this maintenance items does not take critical path; Otherwise, judge that this maintenance items takies critical path (namely the used time covers principle);
S43, calculate basic used time of all types of overhaul based on the maintenance items taking critical path.
Due to the difference of maintenance cycle, maintenance window, servicing time, the maintenance items that may account for critical path in different overhaul rounds there are differences.Therefore from the maintenance task cycle, maintenance window and servicing time three dimensions consider, respectively recognition system is at the time of different overhaul type, different maintenance window the longest maintenance task.
Wherein, according to major overhaul type, the overhaul of nuclear island three class is: short refueling outage (S), normal refueling outage (N), 10 years refueling outages (T).
After the basic used time determining all kinds of overhaul, enter total servicing time that step S5 statistics presets all overhauls in year number.As table 5, it is the refueling outage type arrangement in unit 60 years.For 18 months refulling cycles, within every ten years, be a circulation, perform 6 overhauls altogether, be sequentially: T, S, N, S, N, S.If so default year number is set as 60 years by us, then within 60 years, be divided into 6 time between overhauls, the overhaul number of times in 60 years is generally 40 times.
Table 5
Then, gathered by the number of times of all types of overhauls calculated in the basic used time of all types of overhauls calculated in step S4 and step S5 and obtain table 6, table 6 is overhaul duration and number of times statistics in 60 years.
Table 6
| Overhaul type | The overhaul duration (my god) | The conservative duration (my god) | Overhaul number of times |
| Short refueling outage | 20.63 | 22 | 20 |
| Normal refueling outage | 37.25 | 39 | 13 |
| 10 years refueling outages | 56.54 | 59 | 7 |
Finally can calculate the total available rate of unit, with reference to following formulae discovery according to table 6:
E＝1-(T1*n1+T2*n2+T3*n3+T4+T5)/(365*N)
Wherein, E represents the total available rate of unit, and T1, T2, T3 represent the basic used time of short refueling outage, normal refueling outage, 10 years refueling outages respectively, and unit is sky; N1, n2, n3 represent the number of times of short refueling outage, normal refueling outage, 10 years refueling outages respectively; T4 is known parameters, and represent substantial equipment maintenance or change time delay, unit is sky; T5 is known parameters, and representative forces unavailable time, and be also the unscheduled maintenance time, unit is sky; Year number is preset in N representative, and the present embodiment is 60.
Carry out the calculating of total available rate when being overhaul the last time in the present embodiment, preferably, also can calculate the calculating of an available rate when each overhaul, for design optimization provides reference.As shown in table 7, illustrate the available rate statistics in 60 year phase in longevity of unit.
Table 7
Whether the available rate that S6, determining step S5 calculate meets the demands, and when not meeting the demands, is optimized nuclear power design according to the available rate calculated.Such as, if available rate is lower than desired value, then returns maintenance policy and be optimized and iterative computation.By revising the used time of the maintenance items of critical path, optimizing the sequence of maintenance items in overhaul, shorten the unit scheduled major overhaul time as far as possible, to promote design available rate numerical value, until it reaches desired value.
According to concrete case study on implementation, ROO is pure to reload relative fixing with start and stop heap content, mainly overhauls activity variance under RCD pattern larger.10 years refueling outage RCD pattern steam generators are examined entirely, CCTV inspection, Primary hydraulic test, pressure vessel inservice inspection, containment leak tightness test are primary critical path, and diesel engine overhaul be secondary critical path.Short refueling outage RCD pattern, diesel engine overhaul is primary critical path, low-temperature receiver SEC overhauls as time critical path.Normal refueling outage RCD pattern, diesel engine overhaul is primary critical path, and low low-water level valve maintenance and steam generator examining and repairing are time critical path.Can find out, at short refueling outage, normal refueling outage, diesel engine overhaul Time Optimization space is larger.
The present invention's application RCM analytical technology, the identification (affecting the identification of the maintenance items of basic used time) of critical path in the formulation of simultaneously fusion device preventative maintenance strategy, overhaul, the sequence of overhaul duration, available rate calculate and the factor such as optimization, instruct nuclear power station to carry out the assessment of the economic indexs such as available rate in the design phase.
In sum, implement the available rate evaluation method for the nuclear power station design phase of the present invention, there is following beneficial effect: the present invention is in the nuclear power design phase, for the equipment that may affect major overhaul, formulate the preventative maintenance strategy of these equipment between overhaul time and maintenance cycle in conjunction with RCM analytical approach, and can cover based on the used time maintenance items that principle determines to take the basic used time, finally can calculate the total available rate of unit, this available rate achieves the quantitative evaluation to nuclear power station, avoid the limitation in the past relying on the method determination unit economy index with reference to power station Experience Feedback.Therefore the present invention be applicable to otherness and new nuclear power station that design phase equipment operating maintenance experience lacks, easy popularization, except having good applicability to the assessment of new nuclear power station design phase economic target, the present invention can also promote the use of the economic evaluation work of nuclear power station between total life cycle at the beginning of fortune, designed by otherness and innovative nuclear power station (as small-sized heap etc.) and economic evaluation research field at the beginning of fortune.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (6)
1., for the available rate evaluation method of nuclear power station design phase, it is characterized in that, comprise the steps:
S1, from all systems of nuclear power station, filter out the system that may affect major overhaul;
S2, for the system filtered out in step S1, filter out and can not exit the equipment of maintenance as equipment to be analyzed under RP pattern, and determine the maintenance window of each equipment to be analyzed;
S3, each equipment to be analyzed to be contrasted with reference to the equipment in power station, select with the operating maintenance empirical data in equipment class maintenance template/reference power station as reference according to comparing result, by using RCM analytical approach to treat analytical equipment analysis, and then formulate the preventative maintenance strategy of each equipment to be analyzed between overhaul time and maintenance cycle;
S4, according to the maintenance window determined in described preventative maintenance strategy and step S2, based between maintenance items or whether maintenance items and ROO used time of reloading between project to cover principle determination maintenance items be critical path, calculate the basic used time of all types of overhaul based on the maintenance items taking critical path;
S5, calculate the number of times of all types of overhauls preset in year number according to described maintenance cycle, and according to basic used time of all types of overhaul and number of times and described default year number calculate the total available rate of unit;
Whether the available rate that S6, determining step S5 calculate meets the demands, and when not meeting the demands, is optimized nuclear power design according to the available rate calculated.
2. the available rate evaluation method for the nuclear power station design phase according to claim 1, is characterized in that, comprise in step S2:
S21, judge systemic-function exit window, identify back-up system function equipment and determine equipment comprehensively exit window;
S22, comprehensively exit window according to described, the maintenanceability of equipment is judged, the equipment of maintainability can be defined as equipment to be analyzed completely by discontented, and determine the maintenance window of equipment to be analyzed.
3. the available rate evaluation method for the nuclear power station design phase according to claim 1, is characterized in that, comprise in step S3:
S31, the function passing through the equipment in contrast equipment to be analyzed and reference power station and lectotype selection, judge the type of each equipment to be analyzed, the type of equipment comprises category-A and category-B;
If S32 equipment to be analyzed belongs to category-A, then the preventative maintenance strategy of corresponding device and maintenance cycle in incorporated by reference power station; Wherein, the preventative maintenance strategy in reference power station and maintenance cycle are with the operating maintenance empirical data with reference to power station for reference, and utilization RCM analytical approach carries out fault mode to equipment, failure effect analysis (FEA) is determined;
If S33 equipment to be analyzed belongs to category-B, then keep in repair template for reference with equipment class, use RCM analytical approach, treat analytical equipment and carry out fault mode, failure effect analysis (FEA), and then formulate the preventative maintenance strategy of each equipment to be analyzed between overhaul time and maintenance cycle.
4. the available rate evaluation method for the nuclear power station design phase according to claim 1, is characterized in that, in described step S4, performs following steps respectively for every class overhaul:
S41, according to the maintenance window determined in step S2, the maintenance items in overhaul to be sorted;
S42, the maintenance items after sequence and the ROO project of reloading to be contrasted, if the used time of certain maintenance items can be covered by reload used time of project or other maintenance items of ROO, then judge that this maintenance items does not take critical path; Otherwise, judge that this maintenance items takies critical path;
S43, calculate basic used time of all types of overhaul based on the maintenance items taking critical path.
5. the available rate evaluation method for the nuclear power station design phase according to claim 1, it is characterized in that, the type of described overhaul comprises: short refueling outage, normal refueling outage, 10 years refueling outages.
6. the available rate evaluation method for the nuclear power station design phase according to claim 5, is characterized in that, the available rate that unit is total is in step s 5 based on following formulae discovery:
E＝1-(T1*n1+T2*n2+T3*n3+T4+T5)/(365*N)
Wherein, E represents the total available rate of unit, and T1, T2, T3 represent the basic used time of short refueling outage, normal refueling outage, 10 years refueling outages respectively, and unit is sky; N1, n2, n3 represent the number of times of short refueling outage, normal refueling outage, 10 years refueling outages respectively; T4 is known parameters, and represent substantial equipment maintenance or change time delay, unit is sky; T5 is known parameters, and representative forces unavailable time, and unit is sky; Year number is preset in N representative.
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| CN106503807A (en) * | 2016-09-20 | 2017-03-15 | 西南石油大学 | A kind of modified model RCM analysis methods and the dynamic appliance integrality evaluation system based on which |
| CN106557839A (en) * | 2016-11-15 | 2017-04-05 | 苏州热工研究院有限公司 | A kind of equipment Maintenance Policy optimization method and system based on big data |
| CN109635001A (en) * | 2018-11-26 | 2019-04-16 | 苏州热工研究院有限公司 | Product reliability method for improving and system based on the analysis of equipment failure data |
| CN110909982A (en) * | 2019-10-24 | 2020-03-24 | 广东核电合营有限公司 | Delay demonstration method for long-term temporary-halt short-period maintenance project of nuclear power unit |
| CN112070335A (en) * | 2020-07-16 | 2020-12-11 | 中国核电工程有限公司 | Assessment method and system for planned outage availability of nuclear power plant |
| CN113449990A (en) * | 2021-06-29 | 2021-09-28 | 山东核电有限公司 | Method for evaluating shutdown safety risk during overhaul period of nuclear power station |
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