CN109102089A - A kind of system monitor method based on effectiveness of maintenance assessment - Google Patents
A kind of system monitor method based on effectiveness of maintenance assessment Download PDFInfo
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- 238000012423 maintenance Methods 0.000 title claims abstract description 84
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Abstract
The invention belongs to Nuclear Power Plant Equipment reliability management technical fields, more particularly to a kind of system monitor method based on effectiveness of maintenance assessment, purpose is the quantitative assessment realized to npp safety maintenance of equipment validity, and then targetedly formulate corrective action, the safe operation achievement of constantly improve nuclear power plant.Pass through the application system monitor method of the invention based on effectiveness of maintenance assessment, can system and comprehensively monitor, evaluate and improve the validity of Nuclear Power Plant Equipment maintenance, and then guarantee that the reliability of npp safety system equipment and safety-related system equipment is maintained and even improve.
Description
Technical field
The invention belongs to Nuclear Power Plant Equipment reliability management technical fields, and in particular to one kind is assessed based on effectiveness of maintenance
System monitor method.
Background technique
Maintenance is the important safety-related activity of nuclear power plant, in nuclear power plant's operational process, it is necessary to assure maintenance
Reliability and validity, make nuclear power plant's structures, system and equipment various operating conditions, design basis accident operating condition and
Under selected beyond design basis accident operating condition, scheduled security function can be efficiently performed, guarantees nuclear power plant's operational safety.
Traditionally nuclear power plant takes regularly preventative and corrective method for maintaining, but extensive international operating experience table
It is bright, maintenance is insufficient, excessively repair and repair it is improper can have an adverse effect to nuclear power plant's structures, system and equipment, from
And the operational safety for influencing nuclear power plant is horizontal.International experience in recent years shows that nuclear power plant uses based on structures, system and sets
The Maintenance Rule of standby validity and maintenance risk management can more rationally, effectively improve the validity of maintenance.
2017, State Bureau of Nuclear Safety issued the technical policy (tentative) of nuclear power plant's effectiveness of maintenance " improve ", it is specified that
The basic principle that nuclear power plant is implemented based on effective Maintenance Rule are as follows: be primarily based on security doctrine, determine structures appropriate, be
System and equipment range, are included in validity maintenance management.Then for these structures, system and equipment formulate Risk importance and
Performance indicator, and carry out monitoring.In nuclear power plant's operation, periodically to the practical operation situation of these structures, system and equipment into
Row evaluation, determines whether to meet established performance indicator, and optimize adjustment to Maintenance Rule according to evaluation result.Together
When, it assesses the introduced unit operation risk of maintenance is carried out, takes corresponding precautionary measures when necessary.
It is required to implement " technical policy (tentative) for improving nuclear power plant's effectiveness of maintenance ", nuclear power plant needs in technical policy
In defined frame, establish complete set can be used in monitor and improve nuclear power plant's effectiveness of maintenance porcess system, and
Clear technical criteria, calculation method and technical indicator etc. in each important link of process are effective based on maintenance to be formed
Property assessment system monitor method (hereinafter referred to as Maintenance Rule).
Summary of the invention
It is of the invention the purpose of the present invention is to provide a kind of system monitor method based on effectiveness of maintenance assessment, utilize
Industry device fail data, equipment operating data of specific nuclear power plant etc. calculate, verify and be arranged different safety equipment functions
The reliability and degree of unavailability index of group, are supervised by actual performance of certain method to these safety equipment functional groups
It superintends and directs, to realize the quantitative assessment to npp safety maintenance of equipment validity, and then targetedly formulates corrective action, continue
Improve the safe operation achievement of nuclear power plant.
The present invention is implemented as follows:
A kind of system monitor method based on effectiveness of maintenance assessment, specifically comprises the following steps:
Step 1: structures, system involved in Maintenance Rule and equipment range are determined；
Step 2: the important class of the risk of structures, system and equipment is determined；
Step 3: setting performance indicator；
Step 4: performance indicator is monitored；
Step 5: the validity of maintenance is evaluated.
Step 1 as described above, structures, system and equipment involved in Maintenance Rule include all safety-related
The structures of structures, system and equipment and part non-safety-related, system and equipment refer to when design basis occurs for nuclear power plant
Need to keep structures, system and the equipment of its function when accident or later, they are used to guarantee: 1) reactor coolant pressure
The integrality on boundary；2) it realizes shutdown and keeps reactor in safe shutdown state；3) radioactivity of accident can be prevented or mitigated
Consequence；Since the disabler of certain non-security structures, system and equipment may also jeopardize the safe operation of nuclear power plant, cause
There is undesirable transient state in nuclear power plant, this part structures, system and equipment should also be included in the range of management of Maintenance Rule, pass through
The suitable screening principle of setting, determines that the non-security structures, system and the equipment that meet one of following condition belong to Maintenance Rule
In range: 1) in the crash analysis of nuclear power plant's Final Security Analysis Report, for alleviating accident or transient state；2) emergency operating
Used in regulation；3) failure, which may cause safety-related system equipment, cannot execute its security function；4) failure may be led
Cause shutdown or security system movement.
Step 2 as described above, there are two ways to determining risk different degree:
For existing function in probabilistic safety analysis model, mainly come using probabilistic safety analysis model as analysis tool true
Its fixed risk different degree；Specific judgment criteria are as follows: 1) risk reduced value > 1.005: if assuming, the function 100% is reliable, thus band
The Core damage frequency risk reduced value come is greater than 1.005, then it is assumed that the function is that risk is important；2) risk value added >=2:
If assuming the disabler, thus bring Core damage frequency or a large amount of radioactivity leak frequency risk value added greater than 2, then
Think that the function is that risk is important；3) 90% Core damage frequency: if a function is included among several cut sets, these are cut
Collection is by sort descending and adds up to be more than 90% to the contribution of Core damage frequency, then it is assumed that the function is that risk is important；
For the function not having in probabilistic safety analysis model, determine risk different degree according to the system in nuclear power plant in thing
The influence of safety is judged to during the influence of safety and operation after therefore.
Step 3 as described above, performance indicator are the marks evaluating structures, system and equipment performance and whether meeting the requirements
Standard is to judge the whether effective criterion of maintenance that needle is carried out, and performance indicator is broadly divided into following two categories:
Step 3.1: one kind is the performance indicator of power plant's level, is applicable in all structures within the scope of Maintenance Rule, system
And equipment, this kind of performance indicator generally comprise the number of non-programmed halt, shutdown, unplanned drop power and unplanned peace
Total system starting；
Step 3.2: the performance indicator of another kind of system or equipment level is applicable in specific structures, system and equipment；
Corresponding performance indicator should be set for each function within the scope of Maintenance Rule, several when practical operation
Similar function combines the identical performance indicator of setting；Although for risky important function and belong to non-risk
Function that is important but being in standby mode, it should specific performance indicator is established, for the specific performance of a certain function setting
The state parameter of index reliability, availability or equipment indicates；The function important for other non-risks, passes through power plant's level
Performance indicator monitor；Passage capacity index have trending early warning function to be monitored；If a certain in monitoring time
Function does not allow to fail, i.e., reliability index be 0, then do not have the effect of trending early warning, in this case should further
Performance indicator is established in equipment level, i.e., using equipment status parameter as performance indicator, and carries out state prison to relevant device
It surveys；When setting performance indicator, by the method for extension monitoring cycle, making reliability index is not 0；In addition, in monitoring time
There cannot be duplicate maintenance preventability functional fault, a general performance indicator requirement as any function；For one
The important and non-spare function of a little non-risks, cannot be supervised by the performance indicator of above-mentioned power plant's level, because of these functions
Failure, neither will cause unplanned shutdown and capacity loss, security system will not be caused to act, in this case, just need
Specific performance indicator is established for corresponding function；
The setting principle of Reliability performance measure is the reliability assumed in being analyzed with probabilistic safety analysis and availability is
Foundation is determined using mathematical method such as Poisson distribution, bi-distribution；If the average failure incidence of known device be λ, one
The time of a supervision phase is T, then it is λ T that the expected Failure count occurred in the period is supervised at one；Considered repealed belongs to
Chance event, probability obeys Poisson distribution, by formula P (n)=e- λ T ╳ (λ T) n/n！, can calculate and actually occur n times mistake
The probability of effect；When by a certain function calculating reliability index, the probability data using disabler is needed；First determine single equipment
Failure will cause the equipment list of disabler, then the failure probability of armamentarium is added, and just obtain this disabler
Probability λ T；The failure that this method is suitable for running equipment sets reliability index；
Another method of reliability index setting is, if the average starting crash rate of known device is p, a supervision week
The number of starts of phase is n, then the expected probability that r failure occurs obeys bi-distribution in n times starting；By formula Pn (r)=
[n！/r！(n-r)！] .Pr. (1-P) (n-r), the probability that r failure is actually occurred in n times starting can be calculated；In P=
In the case of two kinds of 0.01 and P=0.001, the result of different Pn (r) is calculated；This method is applicable to set for spare
Standby starting failure setting reliability index；
Availability Index can also be set using one of two methods according to the actual situation: method one, if the function
In PSA model, there is degree of unavailability related data because PSA is calculated in input, such as average value m, median μ, standard deviation,
95% confidence data m+1.645 σ can then be directlyed adopt as performance indicator；Method two collects function past 3-5 not
Historical data can be used；Not available average value m, median μ, standard deviation are calculated, is then referred to by following policy setting performance
Mark: when average value and median very close to when m- μ < < σ, performance indicator is set as m+2 σ；When average value and median difference about one
M- μ ≈ σ when a standard deviation, performance indicator are set as m+1 σ；M- μ > > σ, performance when average value and median differ greatly
Target setting is m+0 σ；
Determining reliability and Availability Index by the above process, are adjusted referring to industry experience and actual performance histories
It is whole.
Step 4 as described above establishes data acquisition platform in order to periodically collect statistics structures, system and equipment
Performance data, including availability, state parameter, Failure count, if discovery is unsatisfactory for performance indicator or has significant adverse trend,
Then formulate correct action；Formally provide whether performance meets performance indicator in the form of system health appraisal report in each season
Evaluation result；Three kinds of situations for being unsatisfactory for performance indicator: a maintenance preventability functional fault causes plant level
Performance indicator do not meet；Or a maintenance preventability functional fault causes the particular characteristic of structures, system and equipment to refer to
Mark does not meet；Or the second of same cause has occurred again in maintenance preventability functional fault for the first time and after implementing correct action
Preventability functional fault is repaired, that is, the failure of duplicate maintenance preventability has occurred；
Step 4.1. performance state meets the performance indicator of setting
If evaluation result is to meet performance indicator, it is believed that corresponding SSC is able to carry out scheduled design function, Ke Yiji
It is continuous to execute corresponding maintenance, test activity according to original preventive maintaining outline and routine test outline, and continue to implement normal
Performance monitoring；
Step 4.2. performance state is unsatisfactory for performance indicator
If the evaluation result of a certain function is to be unsatisfactory for performance indicator, need it from normal performance monitoring state
Switch to special monitor state；It needs to analyze reason, formulates targetedly correct action scheme, as optimization maintenance or test are movable
Content and frequency, it may also be necessary to specific technical parameter standard is set, to monitor the validity of correct action scheme；
Step 4.3. implements the monitoring state conversion after corrective measure
Specific evaluation criterion and observation period are set, when these standards all obtain meeting within the minimum observation period,
Normal performance monitoring state can be transformed into from special monitor state to the monitoring of structures, system and equipment.
Step 5 as described above, using at least each circulation reply maintenance of reloading of the process of step 1 to step 4
Validity make periodical evaluation, twice evaluation interval be no more than 24 months；Tradeoff is made in assessment between following two purpose, must
It makes adjustment when wanting: 1) preventing SSCS from breaking down by maintenance；2) it reduces to the greatest extent as caused by monitoring and preventative maintenance
The degree of unavailability of SSCS.
The beneficial effects of the present invention are:
By application it is of the invention based on effectiveness of maintenance assessment system monitor method, can system and comprehensively supervise
It surveys, evaluation and the validity for improving Nuclear Power Plant Equipment maintenance, and then guarantees npp safety system equipment and safety-related
The reliability of system equipment, which is maintained, even to be improved.
Detailed description of the invention
Fig. 1 is a kind of flow chart of system monitor method based on effectiveness of maintenance assessment of the invention.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of system monitor method based on effectiveness of maintenance assessment, specifically comprises the following steps:
Step 1: structures, system involved in Maintenance Rule and equipment range are determined；
SSC involved in Maintenance Rule (structures, system and equipment) includes the non-peace of all safety-related SSC and part
The SSC of total correlation refers to the SSC for needing to keep its function when design basis accident occurs for nuclear power plant or later, they are used to
Guarantee: 1) integrality of reactor coolant pressure boundary；2) it realizes shutdown and keeps reactor in safe shutdown state；3) energy
Prevent or mitigate the Radiological Consequences of accident.Further, since the disabler of certain non-security SSCs may also jeopardize nuclear power plant
Safe operation, cause nuclear power plant undesirable transient state occur, this part SSCs should also be included in the range of management of Maintenance Rule.Tool
For body, it is exactly the suitable screening principle of setting, determines that the non-security SSCs for meeting one of following condition belongs to Maintenance Rule model
In enclosing: 1) in the crash analysis of nuclear power plant's Final Security Analysis Report, for alleviating accident or transient state；2) emergency operating is advised
Used in journey；3) failure, which may cause safety-related system equipment, cannot execute its security function；4) failure may cause
Shutdown or security system movement.
Step 2: the important class of the risk of structures, system and equipment is determined；
There are two ways to determining risk different degree: for existing function in PSA (probabilistic safety analysis) model, mainly
Its risk different degree is determined as analysis tool using PSA；Specific judgment criteria are as follows: 1) RRW (risk reduced value) > 1.005: if false
If the function 100% is reliable, thus bring CDF (Core damage frequency) risk reduced value is greater than 1.005, then it is assumed that the function
It is that risk is important；2) RAW (risk value added) >=2: if assuming the disabler, thus bring CDF or LERF (are largely put
Penetrating property leaks frequency) risk value added is greater than 2, then it is assumed that and the function is that risk is important；3) 90%CDF: if a function packet
It is contained among several cut sets, these cut sets are by sort descending and add up to be more than 90% to the contribution of CDF, then it is assumed that the function is wind
Danger is important.For the function not having in PSA analysis model, determine that risk different degree can also exist according to the system in nuclear power plant
The influence of safety is judged to during the influence of safety and operation after accident.
Step 3: setting performance indicator；
Performance indicator is to evaluate the standard that whether meets the requirements of SSC performance, is to judge whether is maintenance that needle is carried out
Effective criterion, performance indicator are broadly divided into following two categories:
Step 3.1: one kind is the performance indicator of power plant's level, and all SSC being applicable in MR (Maintenance Rule) range are this kind of
Performance indicator generally comprises the number of non-programmed halt, shutdown, unplanned drop power and unplanned security system starting.
Step 3.2: the performance indicator of another kind of system or equipment level is applicable in specific SSC；
Corresponding performance indicator should be set for each function within the scope of MR, when practical operation can be several phases
Close function combines the identical performance indicator of setting.Although for risky important function and belong to non-risk weight
Want but be in the function of standby mode, it should establish specific performance indicator, refer to for the specific performance of a certain function setting
Mark is generally indicated with the state parameter of reliability, availability or equipment.The function important for other non-risks, can generally pass through
The performance indicator of power plant's level monitors.Passage capacity index have certain trending early warning function to be monitored.If
A certain function does not allow to fail in monitoring time, i.e., reliability index is 0, then does not have the effect of trending early warning, such case
Under should further performance indicator establish in equipment level, i.e., using equipment status parameter as performance indicator, and to correlation
Equipment carries out status monitoring.When setting performance indicator, reliability can be made by the method for proper extension monitoring cycle as far as possible
Index is not 0.In addition, cannot have duplicate MPFF (maintenance preventability functional fault) in monitoring time, as any function
The general performance indicator requirement of one of energy.Important for some non-risks and non-spare function, cannot pass through above-mentioned power plant
The performance indicator of level is supervised, because the failure of these functions, neither will cause unplanned shutdown and capacity loss, will not
Security system is caused to act, in this case, it is necessary to establish specific performance indicator for corresponding function.
The setting principle of Reliability performance measure be using PSA analyze in the reliability assumed and availability as foundation, use
Mathematical method (Poisson distribution, bi-distribution) determines.If the average failure incidence of known device is λ, one is supervised the phase
Time is T, then it is λ T that the expected Failure count occurred in the period is supervised at one.Considered repealed belongs to chance event,
Its probability obeys Poisson distribution, by formula P (n)=e- λ T ╳ (λ T) n/n！, the probability for actually occurring n times failure can be calculated.
When by a certain function calculating reliability index, the probability data using disabler is needed.First determine that single equipment failure will
Cause the equipment list of disabler, then the failure probability of armamentarium is added, just obtains the probability λ T of this disabler.
The failure that this method is suitable for running equipment sets reliability index.
Another method of reliability index setting is, if the average starting crash rate of known device is p, a supervision week
The number of starts of phase is n, then the expected probability that r failure occurs obeys bi-distribution in n times starting.By formula Pn (r)=
[n！/r！(n-r)！] .Pr. (1-P) (n-r), the probability that r failure is actually occurred in n times starting can be calculated.In P=
In the case of two kinds of 0.01 and P=0.001, the result of different Pn (r) is calculated.This method is applicable to set for spare
Standby starting failure setting reliability index.
Availability Index can also be set using one of two methods according to the actual situation: method one, if the function
In PSA model, there is degree of unavailability related data (average value m, median μ, standard deviation etc.) because PSA is calculated in input,
95% confidence data (m+1.645 σ) can then be directlyed adopt as performance indicator.Method two collects function past 3-5's
Unavailable historical data.Not available average value m, median μ, standard deviation etc. are calculated, following policy setting is then pressed
Can index: when average value and median very close to when (m- μ < < σ), performance indicator is set as m+2 σ.When average value and median phase
When poor about standard deviation (m- μ ≈ σ), performance indicator is set as m+1 σ.(the m- μ when average value and median differ greatly
> > σ), performance indicator is set as m+0 σ.
Determining reliability and Availability Index by the above process, be referred to industry experience and actual performance histories into
The necessary adjustment of row.
Step 4: performance indicator is monitored；
Data acquisition platform is established in order to periodically collect performance data (availability, state parameter, the failure of statistics SSC
Number), if discovery is unsatisfactory for performance indicator or has significant adverse trend, then formulate correct action.Each season, with system health
The form of appraisal report formally provides the evaluation result whether performance meets performance indicator.Be unsatisfactory for performance indicator three
Kind situation: a MPFF causes the performance indicator of plant level not meet；Or a MPFF causes the particular characteristic index of SSC less than
Foot；Or second of MPFF of same cause has occurred again after first MPFF and implementation correct action, that is, RMPFF (weight has occurred
The failure of multiple maintenance preventability).
Step 4.1. performance state meets the performance indicator of setting
If evaluation result is to meet performance indicator, it is believed that corresponding SSC is able to carry out scheduled design function, Ke Yiji
It is continuous to execute corresponding maintenance, test activity according to original preventive maintaining outline and routine test outline, and continue to implement normal
Performance monitoring.
Step 4.2. performance state is unsatisfactory for performance indicator
If the evaluation result of a certain function is to be unsatisfactory for performance indicator, need it from normal performance monitoring state
Switch to special monitor state.Need to analyze reason, formulating targetedly correct action scheme, (such as optimization maintenance or test are movable
Content and frequency), it may also be necessary to specific technical parameter standard is set, to monitor the validity of correct action scheme.
Step 4.3. implements the monitoring state conversion after corrective measure
Specific evaluation criterion and observation period are set, when these standards all obtain meeting within the minimum observation period,
Normal performance monitoring state can be transformed into from special monitor state to the monitoring of SSC.
Step 5: the validity of maintenance is evaluated；
It is periodically commented using at least each validity work for reloading circulation reply maintenance of the process of step 1 to step 4
Estimate, evaluation interval is no more than 24 months twice.Assessment will use up actual capabilities and consider operating experience in industry wide.It will be following two
Tradeoff is made between a purpose, is made adjustment when necessary: (1) preventing SSCS from breaking down by maintenance；(2) reduce to the greatest extent due to
The degree of unavailability of SSCS caused by monitoring and preventative maintenance.
Implementation method of the invention is explained in detail above in conjunction with embodiment, but the present invention is not limited to above-mentioned realities
Example is applied, it within the knowledge of a person skilled in the art, can also be without departing from the purpose of the present invention
Various changes can be made.The content that description in the present invention is not described in detail can use the prior art.
Claims (6)
1. a kind of system monitor method based on effectiveness of maintenance assessment, specifically comprises the following steps:
Step 1: structures, system involved in Maintenance Rule and equipment range are determined；
Step 2: the important class of the risk of structures, system and equipment is determined；
Step 3: setting performance indicator；
Step 4: performance indicator is monitored；
Step 5: the validity of maintenance is evaluated.
2. the system monitor method according to claim 1 in effectiveness of maintenance assessment, it is characterised in that: the step
One, structures, system and equipment involved in Maintenance Rule include all safety-related structures, system and equipment and part
Structures, system and the equipment of non-safety-related refer to when design basis accident occurs for nuclear power plant or need to keep it later
Structures, system and the equipment of function, they are used to guarantee: 1) integrality of reactor coolant pressure boundary；2) it realizes and stops
Heap and holding reactor are in safe shutdown state；3) Radiological Consequences of accident can be prevented or mitigated；Due to certain non-security structures
The disabler for building object, system and equipment may also jeopardize the safe operation of nuclear power plant, and nuclear power plant is caused undesirable wink occur
State, this part structures, system and equipment should also be included in the range of management of Maintenance Rule, by the way that suitable screening principle is arranged,
Determine that meeting the non-security structures, system and equipment of one of following condition belongs within the scope of Maintenance Rule: 1) nuclear power plant most
In the crash analysis of whole Security Analysis Report, for alleviating accident or transient state；2) used in Emergency operation guidance；3) it fails
May cause safety-related system equipment cannot execute its security function；4) failure may cause shutdown or security system is dynamic
Make.
3. the system monitor method according to claim 1 in effectiveness of maintenance assessment, it is characterised in that: the step
Two, there are two ways to determining risk different degree:
For existing function in probabilistic safety analysis model, it is mainly determined as analysis tool using probabilistic safety analysis model
Risk different degree；Specific judgment criteria are as follows: 1) risk reduced value > 1.005: if assuming, the function 100% is reliable, thus bring
Core damage frequency risk reduced value is greater than 1.005, then it is assumed that the function is that risk is important；2) risk value added >=2: if false
If the disabler, thus bring Core damage frequency or a large amount of radioactivity leak frequency risk value added greater than 2, then it is assumed that
The function is that risk is important；3) 90% Core damage frequency: if a function is included among several cut sets, these cut sets are pressed
Sort descending and it is accumulative be more than 90% to the contribution of Core damage frequency, then it is assumed that the function is that risk is important；
For the function not having in probabilistic safety analysis model, determine risk different degree according to the system in nuclear power plant after accident
Influence during influence and operation to safety to safety judges.
4. the system monitor method according to claim 1 in effectiveness of maintenance assessment, it is characterised in that: the step
Three, it is the maintenance for judging needle and being carried out that performance indicator, which is the standard evaluating structures, system and equipment performance and whether meeting the requirements,
Activity whether effective criterion, performance indicator is broadly divided into following two categories:
Step 3.1: one kind is the performance indicator of power plant's level, all structures being applicable within the scope of Maintenance Rule, system and is set
Standby, this kind of performance indicator generally comprises the number of non-programmed halt, shutdown, unplanned drop power and unplanned safety system
System starting；
Step 3.2: the performance indicator of another kind of system or equipment level is applicable in specific structures, system and equipment；
Corresponding performance indicator should be set for each function within the scope of Maintenance Rule, several close when practical operation
Function combine the identical performance indicator of setting；Although for risky important function and to belong to non-risk important
But it is in the function of standby mode, it should specific performance indicator is established, for the specific performance indicator of a certain function setting
It is indicated with the state parameter of reliability, availability or equipment；The function important for other non-risks, passes through the property of power plant's level
Can index monitor；Passage capacity index have trending early warning function to be monitored；If a certain function in monitoring time
Do not allow to fail, i.e., reliability index is 0, then does not have the effect of trending early warning, in this case should be further performance
Index Establishment is in equipment level, i.e., using equipment status parameter as performance indicator, and carries out status monitoring to relevant device；If
When determining performance indicator, by the method for extension monitoring cycle, making reliability index is not 0；In addition, cannot have in monitoring time
Duplicate maintenance preventability functional fault, a general performance indicator requirement as any function；For some non-wind
The important and non-spare function in danger, cannot be supervised by the performance indicator of above-mentioned power plant's level, because of the failure of these functions,
It neither will cause unplanned shutdown and capacity loss, security system will not be caused to act, in this case, it is necessary to be directed to phase
The function of answering establishes specific performance indicator；
The setting principle of Reliability performance measure be using probabilistic safety analysis analyze in the reliability assumed and availability as foundation,
Using mathematical method, determined such as Poisson distribution, bi-distribution；If the average failure incidence of known device is λ, a supervision
The time of phase is T, then it is λ T that the expected Failure count occurred in the period is supervised at one；Considered repealed belongs to Random event
Part, probability obeys Poisson distribution, by formula P (n)=e- λ T ╳ (λ T) n/n！, can calculate and actually occur the general of n times failure
Rate；When by a certain function calculating reliability index, the probability data using disabler is needed；First determine single equipment failure just
It can cause the equipment list of disabler, then the failure probability of armamentarium is added, just obtain the probability λ of this disabler
T；The failure that this method is suitable for running equipment sets reliability index；
Another method of reliability index setting is, if the average starting crash rate of known device is p, one is supervised the period
The number of starts is n, then the expected probability that r failure occurs obeys bi-distribution in n times starting；By formula Pn (r)=[n！/
r！(n-r)！] .Pr. (1-P) (n-r), the probability that r failure is actually occurred in n times starting can be calculated；In P=0.01 and P
In the case of=0.001 two kind, the result of different Pn (r) is calculated；This method is applicable to opening for stand-by equipment
Dynamic failure setting reliability index；
Availability Index can also be set using one of two methods according to the actual situation: method one, if the function exists
In PSA model, there is degree of unavailability related data because PSA is calculated in input, such as average value m, median μ, standard deviation, then may be used
95% confidence data m+1.645 σ is directlyed adopt as performance indicator；Method two collects the unavailable of function past 3-5
Historical data；Not available average value m, median μ, standard deviation are calculated, following policy setting performance indicator is then pressed:
When average value and median very close to when m- μ < < σ, performance indicator is set as m+2 σ；When average value and median differ about one
M- μ ≈ σ when standard deviation, performance indicator are set as m+1 σ；When average value and median differ greatly, m- μ > > σ, performance refer to
Mark is set as m+0 σ；
Determining reliability and Availability Index by the above process, are adjusted referring to industry experience and actual performance histories.
5. the system monitor method according to claim 1 in effectiveness of maintenance assessment, it is characterised in that: the step
Four, establish data acquisition platform in order to periodically collect statistics structures, system and equipment performance data, including availability,
State parameter, Failure count then formulate correct action if discovery is unsatisfactory for performance indicator or has significant adverse trend；Each season
Degree, formally provides the evaluation result whether performance meets performance indicator in the form of system health appraisal report；Described is discontented
Three kinds of situations of sufficient performance indicator: a maintenance preventability functional fault causes the performance indicator of plant level not meet；Or one
Item maintenance preventability functional fault causes the particular characteristic index of structures, system and equipment not meet；Or it is repaired for the first time
Second of maintenance preventability functional fault of same cause has occurred after preventability functional fault and implementation correct action again,
The failure of duplicate maintenance preventability has occurred；
Step 4.1. performance state meets the performance indicator of setting
If evaluation result is to meet performance indicator, it is believed that corresponding SSC is able to carry out scheduled design function, can continue by
Corresponding maintenance, test activity are executed according to original preventive maintaining outline and routine test outline, and continues to implement normal property
It can monitoring；
Step 4.2. performance state is unsatisfactory for performance indicator
If the evaluation result of a certain function is to be unsatisfactory for performance indicator, need to switch to it from normal performance monitoring state
Special monitor state；It needs to analyze reason, formulates targetedly correct action scheme, such as optimization maintenance or the movable content of test
And frequency, it may also be necessary to specific technical parameter standard is set, to monitor the validity of correct action scheme；
Step 4.3. implements the monitoring state conversion after corrective measure
Specific evaluation criterion and observation period are set, when these standards all obtain meeting within the minimum observation period, to structure
The monitoring for building object, system and equipment can be transformed into normal performance monitoring state from special monitor state.
6. the system monitor method according to claim 1 in effectiveness of maintenance assessment, it is characterised in that: the step
Five, periodical evaluation is made using at least each validity for reloading circulation reply maintenance of the process of step 1 to step 4, two
Secondary evaluation interval is no more than 24 months；Tradeoff is made in assessment between following two purpose, makes adjustment when necessary: 1) passing through dimension
Repairing prevents SSCS from breaking down；2) it reduces to the greatest extent as monitoring the degree of unavailability with SSCS caused by preventative maintenance.
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