A method for adjusting parameter data of a nuclear instrumentation system

Abstract

The present application relates to a kind of nuclear instrumentation system parameter data adjustment method, comprising the following steps: obtaining the parameter data before modification of power range, the parameter data of power range to be modified and the current data of nuclear instrumentation measured ionization chamber, wherein the parameter data before modification of power range at least includes the correction nuclear electric power coefficient Gk0 before modification, the nuclear power value before modification and the instantaneous nuclear power value to be modified are calculated;First nuclear power deviation is calculated again;Determine the relationship between first nuclear power deviation and preset nuclear power deviation;If it is within preset nuclear power deviation, calculate first group intermediate parameter data according to the nuclear power value before modification, the instantaneous nuclear power value to be modified and the parameter data of power range to be modified;Through first group intermediate parameter data, it can prevent unnecessary power rate fast alarm triggered by the short-time nuclear power indication deviation too large caused by parameter modification.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reactor control and protection system, and particularly relates to a method for adjusting parameter data of a nuclear instrument system. BACKGROUND

[0002] There are four out-of-pile nuclear instrument parameters, K U , K L , a and G k . After the calibration test of the out-of-pile nuclear instrument parameters, the four parameters need to be modified. There are three parameters related to power display in the out-of-pile nuclear instrument parameters, K U , K L and G k . Due to the filtering and delay of the G k parameter in the modification process, only K U and K L are effective in a short time after the modification, which causes the deviation of the nuclear power indication from the true value. In some cases, the short-time nuclear power indication deviation exceeds 5% FP, which further triggers unnecessary power change rate fast alarm. SUMMARY

[0003] The technical problem to be solved by the present application is that after the modification of the G k parameter of the out-of-pile nuclear instrument, the short-time nuclear power indication deviation is large due to filtering and delay, which easily mis-triggers the power change rate fast alarm. The present application provides a method for adjusting parameter data of a nuclear instrument system.

[0004] The technical solution adopted by the present application to solve the technical problem is that a method for adjusting parameter data of a nuclear instrument system is constructed.

[0005] S1: obtaining parameter data before modification of a power range, parameter data to be modified of the power range and current data of a nuclear instrument measured ionization chamber, wherein the parameter data before modification of the power range at least includes a modified nuclear power coefficient (Gk0) before modification;

[0006] S2: calculating a nuclear power value before modification according to the parameter data before modification of the power range and the current data;

[0007] S3: obtaining a modified instantaneous nuclear power value according to the modified nuclear power coefficient (Gk0) before modification, the parameter data to be modified of the power range and the current data;

[0008] S4: calculating a first nuclear power deviation according to the nuclear power value before modification and the modified instantaneous nuclear power value;

[0009] S5: judging the relationship between the first nuclear power deviation and a preset nuclear power deviation;

[0010] S6: calculating a first set of intermediate parameter data according to the unmodified nuclear power value, the unmodified instantaneous nuclear power value and the unmodified parameter data of the power range, if the nuclear power is within the preset nuclear power deviation;

[0011] S7: adjusting the nuclear power in turn using the first set of intermediate parameter data and the unmodified parameter data of the power range of the power range, so that the nuclear power deviation of each adjustment is within the safety range.

[0012] In an embodiment, the obtaining the unmodified parameter data of the power range further comprises: an unmodified upper power range coefficient (K U,0 ) and an unmodified lower power range coefficient (K L,0 );

[0013] The unmodified parameter data of the power range comprises: an unmodified upper power range coefficient (K U,2 ), an unmodified lower power range coefficient (K U,2 ) and an unmodified correction nuclear power coefficient (Gk0);

[0014] The current data of the ionization chamber of the nuclear instrument comprises: upper current data I U and lower current data I L .

[0015] In an embodiment, the S2 comprises: bringing the unmodified upper power range coefficient (K U,0 ), the unmodified lower power range coefficient (K L,0 ), the unmodified correction nuclear power coefficient (Gk0), the upper current data (I U ) and the lower current data (I L ) into a first preset formula to obtain the unmodified nuclear power value (Pr0);

[0016] Wherein the first preset formula is:

[0017] Pr0=Gk0×(K U,0 ×I U +K L,0 ×I L ).

[0018] In an embodiment, the S3 comprises: bringing the unmodified correction nuclear power coefficient (Gk0), the unmodified upper power range coefficient (K U,2 ), the unmodified lower power range coefficient (K L,2 ), the upper current data (I U ) and the lower current data (I L) into the second preset formula to obtain the modified instantaneous nuclear power value (Pr2);

[0019] The second preset formula is:

[0020] Pr2=Gk0×(K U,2 ×I U +K L,2 ×I L ).

[0021] In an embodiment, the set of intermediate parameters comprises: a first intermediate power range upper coefficient (K U,1 ), a first intermediate power range lower coefficient (K L,1 ), and a first intermediate correction nuclear power coefficient (Gk1).

[0022] In an embodiment, the S6 comprises:

[0023] If within the preset nuclear power deviation, the unmodified nuclear power value (Pr0) and the modified instantaneous nuclear power value (Pr2) are brought into a third preset formula to obtain a first intermediate coefficient (K);

[0024] The first intermediate coefficient (K) is multiplied by the modified power range upper coefficient (K U,2 ) to obtain the first intermediate power range upper coefficient (K U,1 );

[0025] The first intermediate coefficient (K) is multiplied by the modified power range lower coefficient (K L,2 ) to obtain the first intermediate power range lower coefficient (K L,1 );

[0026] The modified correction nuclear power coefficient (Gk2) is divided by the first intermediate coefficient (K) to obtain the first intermediate correction nuclear power coefficient (Gk1).

[0027] In an embodiment, the third preset formula is:

[0028]

[0029] Wherein, Pr0 is the unmodified nuclear power value, Pr2 is the modified instantaneous nuclear power value, and K is the first intermediate coefficient.

[0030] In an embodiment, the method further comprises:

[0031] S8: If greater than the preset nuclear power deviation, a second set of intermediate parameter data and a third set of intermediate parameter data are calculated according to the unmodified nuclear power value, the modified instantaneous nuclear power value, and the modified parameter data of the power range.

[0032] S9: sequentially adjusting the nuclear power using the second set of intermediate parameter data, the third set of intermediate parameter data and the modified parameter data of the power range, so that the deviation of each adjusted nuclear power is within the safety range.

[0033] In an embodiment, the second set of intermediate parameter data comprises: a second intermediate power range upper coefficient (K U,1.1 ), a second intermediate power range lower coefficient (K L,1.1 ), and a second intermediate corrected nuclear power coefficient (Gk 1.1 );

[0034] The third set of intermediate parameter data comprises: a third intermediate power range upper coefficient (K U,1.2 ), a third intermediate power range lower coefficient (K L,1.2 ), and a second intermediate corrected nuclear power coefficient (Gk 1.2 ).

[0035] In an embodiment, S8 comprises: if the preset nuclear power deviation is greater than the preset value, bringing the unmodified nuclear power value (Pr0) and the modified instantaneous nuclear power value (Pr2') into a fourth preset formula to obtain the second intermediate coefficient (K1);

[0036] Multiplying the second intermediate coefficient (K1) by the modified power range upper coefficient (K U,2 ) to obtain the second intermediate power range upper coefficient (K U,1.1 );

[0037] Multiplying the second intermediate coefficient (K1) by the modified power range lower coefficient (K L,2 ) to obtain the second intermediate power range lower coefficient (K L,1.1 );

[0038] Dividing the modified corrected nuclear power coefficient (Gk2) by the second intermediate coefficient (K1) to obtain the second intermediate corrected nuclear power coefficient (Gk 1.1 );

[0039] Bringing the unmodified nuclear power value (Pr0) and the modified instantaneous nuclear power value (Pr2') into a fifth preset formula to obtain the third intermediate coefficient (K2);

[0040] Multiplying the third intermediate coefficient (K2) by the modified power range upper coefficient (K U,2 ) to obtain the second intermediate power range upper coefficient (K U,1.2 );

[0041] multiplying the second intermediate coefficient (K2) by the to-be-modified power range lower coefficient (K L,2 ) to obtain the second intermediate power range lower coefficient (K L,1.2 ) ;

[0042] dividing the to-be-modified corrected nuclear power coefficient (Gk2) by the second intermediate coefficient (K2) to obtain the second intermediate corrected nuclear power coefficient (Gk 1.2 ) ;

[0043] The fourth preset formula is:

[0044]

[0045] wherein K1 is the second intermediate coefficient, Pr0 is the nuclear power value before modification, and Pr2 is the to-be-modified instantaneous nuclear power value;

[0046] The fifth preset formula is:

[0047]

[0048] wherein K2 is the third intermediate coefficient, Pr0 is the nuclear power value before modification, and Pr2 is the to-be-modified instantaneous nuclear power value.

[0049] The present application has the following beneficial effects: by obtaining the parameter data before modification of the modification power range, the to-be-modified parameter data of the power range, and the measured ionization chamber current, the nuclear power values before and after modification are calculated and compared, the instantaneous nuclear power change after modification is calculated, and it is determined whether the change is within the preset nuclear power deviation. If yes, the intermediate parameter data is calculated, which effectively prevents the short-time nuclear power indication deviation from being too large due to parameter modification, thereby triggering unnecessary power change rate fast alarm. BRIEF DESCRIPTION OF DRAWINGS

[0050] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0051] Figure 1 is a structural schematic diagram of four measurement channels of the power range in the nuclear instrument system of the present application;

[0052] Figure 2 is a structural schematic diagram of four ionization chamber detectors in the measurement channel of the present application;

[0053] Figure 3 is a nuclear power change fast alarm schematic diagram of the present application;

[0054] Figure 4 is a flow schematic diagram of the parameter data adjustment method of the nuclear instrument system of the present application;

[0055] Figure 5It is a method for adjusting parameter data of a nuclear instrument system according to the present application. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0057] In view of the technical problems in the background art, after the Gk parameter of the ex-core nuclear instrument is modified, the short-time nuclear power indication deviation is large due to filtering and delay, and the power change rate fast alarm is easily triggered. The present application provides a method for adjusting parameter data of a nuclear instrument system, by obtaining the parameter data before modification of the modified power range, the parameter data to be modified of the power range and the measured ionization chamber current, calculating and comparing the nuclear power values before and after modification, calculating the modified instantaneous nuclear power change, and judging whether the change is within the preset nuclear power deviation. If yes, the intermediate parameter data is calculated, which effectively prevents the unnecessary power change rate fast alarm triggered by the too large short-time nuclear power indication deviation caused by parameter modification.

[0058] During normal operation or extended operation of a nuclear power unit, parameter adjustment of an ex-core nuclear instrument system needs to be performed regularly. When the parameter of the nuclear instrument system changes greatly, the nuclear power value will change greatly in a short time during the parameter modification process, and then the alarm of high power change rate will be triggered. According to the present application, the final nuclear instrument parameter is taken as a final value, and a set of intermediate values are calculated. The intermediate values are modified first, and then the final values are modified during the parameter modification process, which can avoid the situation that the nuclear power display value changes beyond the limit value in a short time and then triggers the high power change rate alarm, and ensures the safety of unit control.

[0059] A nuclear instrument system is provided in a nuclear power plant to monitor the reactor core power online. The nuclear instrument system measures the neutrons leaked outside the pressure vessel through a detector arranged outside the pressure vessel, and converts the neutrons into a current value. After correction calculation, the core power is obtained. Since the leaked neutrons are directly related to the core 15 nuclear reaction rate, the response of the nuclear power is fast, and it is generally used as a reactor power protection signal. However, the display value error is large, so a more accurate offline core power measurement result (reference power) is needed for regular calibration during the operation of the unit.

[0060] During the initial criticality to full power operation of the reactor, the neutron flux in the core 15 changes by about 11 orders of magnitude. In order to cover the 11 orders of magnitude of the measurement range, the nuclear instrumentation system adopts three ranges of detectors, namely the source range, the intermediate range and the power range, to cope with the core 15 monitoring at the reactor shutdown, low power and high power levels. During normal power operation, the core power is mainly monitored by the power range. The power range has four measurement channels, which are arranged at the four quadrant positions of the core 15 as shown in Figure 1 . Each measurement channel is divided into four ionization chamber detectors to cover the axial height of the core 15 as shown in Figure 2 . The four ionization chamber detectors are the first ionization chamber 10, the second ionization chamber 11, the third ionization chamber 12 and the fourth ionization chamber 13.

[0061] The nuclear power and the axial power deviation (which represents the degree of deviation of the upper and lower power of the core 15) of each measurement channel of the power range are calculated according to the formula by collecting the current values of the four axial arranged detectors.

[0062] Pr=Gk×(K U ×I U +K L ×I L )

[0063] ΔI=α×(K U ×I U -K L ×I L )

[0064] Wherein:

[0065] Pr represents the nuclear power, ΔI is the axial power deviation; K U , K L , α and Gk are the parameters of the nuclear instrumentation system; I U is the average value of the measurement current values of the upper two ionization chambers; I L is the average value of the measurement current of the lower two ionization chambers.

[0066] During normal operation of the reactor, in order to prevent uncontrolled changes in the core power due to equipment failure, a power rate fast alarm is set in the ex-core nuclear instrumentation system, when the value of the nuclear power changes at a rate exceeding 5% FP / 2s as shown in a certain measurement channel, the alarm is triggered, when two channels of the four measurement channels simultaneously appear alarm, the reactor emergency shutdown is triggered. During normal operation of the reactor, when the nuclear power Pr indicates that there is a deviation, the Gk parameter is adjusted to make the nuclear power Pr consistent with the reference power, but the axial power deviation AI cannot be calibrated through the Gk parameter, therefore, when the Gk value exceeds the range of (0.95, 1.05), the nuclear power Pr and the axial power deviation AI need to be calibrated through the xenon oscillation test, at this time, more accurate nuclear instrumentation system parameters K U 、K L and α are obtained, and the Gk parameter is set to 1.

[0067] In the system design, in order to prevent the power indication from changing too fast when the Gk parameter is modified, a first-order filter is added to the Gk parameter. After the xenon oscillation test, when the nuclear instrumentation system parameters are modified, due to the existence of the filter of the Gk parameter, there is a delay in the effect of the Gk parameter, at the moment when the nuclear instrumentation parameter takes effect, the nuclear power indication changes greatly in a short time, the change rate exceeds 5% FP / 2s in a short time, and then the power rate fast alarm is generated, as shown in Figure 3 .

[0068] Figure 4 is a flowchart of an embodiment of the method for adjusting the nuclear instrumentation system parameter data. As shown in Figure 4 , the steps of the method for adjusting the nuclear instrumentation system parameter data include:

[0069] S1: obtaining the parameter data before modification of the power range, the parameter data to be modified of the power range and the current data of the ionization chamber actually measured by the nuclear instrumentation, wherein the parameter data before modification of the power range at least includes the corrected nuclear electric power coefficient Gk0 before modification.

[0070] S2: calculating the nuclear power value before modification according to the parameter data before modification of the power range and the current data.

[0071] S3: obtaining the instantaneous nuclear power value to be modified according to the corrected nuclear electric power coefficient Gk0 before modification, the parameter data to be modified of the power range and the current data.

[0072] It is necessary to explain in the above embodiment: by acquiring the parameter data before modification of the modified power range, the parameter data to be modified of the power range and the measured ionization chamber current, the nuclear power value before and after modification is calculated and compared, the instantaneous nuclear power change after modification is calculated, and it is judged whether the change is within the preset nuclear power deviation. If yes, the intermediate parameter data is calculated, which effectively prevents the short nuclear power indication deviation caused by parameter modification from being too large to trigger unnecessary power change rate fast alarm.

[0073] Further, the parameter data before modification of the power range further includes: the upper coefficient K U,0 of the power range before modification L,0 ; the parameter data to be modified of the power range includes: the upper coefficient K U,2 of the power range to be modified, the lower coefficient K L,2 of the power range to be modified and the correction nuclear power coefficient Gk2 to be modified; the current data of the ionization chamber of the nuclear instrument includes: the upper current data I U , the lower current data I L . Specifically, as shown in Table 1:

[0074]

[0075] Wherein, Pr represents the nuclear power, ΔI represents the axial power deviation, G k , K U , K L and α are nuclear instrument system parameters.

[0076] Further, S2 includes: the upper coefficient K U,0 of the power range before modification, the lower coefficient K L,0 of the power range before modification, the correction nuclear power coefficient Gk0 before modification, the upper current data I U , the lower current data I L are brought into the first preset formula to obtain the nuclear power value Pr0 before modification. Wherein the first preset formula is:

[0077] Pr0=Gk0×(K U,0 ×I U +K L,0 ×I L ).

[0078] According to the data of Table 1 and the first preset formula, the nuclear power value Pr0 before modification can be calculated as Pr0=0.9500×(296978×0.00017542+319883×0.00016241), which is equal to 98.8457%FP by calculation.

[0079] Further, S3 comprises: substituting the modified pre-modification correction nuclear power coefficient Gk0, the to-be-modified upper power range coefficient K U,2 , the to-be-modified lower power range coefficient K L,2 , the upper current data I U , and the lower current data I L into a second preset formula to obtain a to-be-modified instantaneous nuclear power value Pr2. The second preset formula is:

[0080] Pr2=Gk0×(K U,2 ×I U +K L,2 ×I L )

[0081] According to the data in Table 1 and the second preset formula, Pr2=0.95000×(281287×0.00017542+300652×0.00016241) can be calculated. After calculation, Pr2 is equal to 93.2636%FP.

[0082] S4: calculating a first nuclear power deviation according to the pre-modification nuclear power value and the to-be-modified instantaneous nuclear power value.

[0083] Specifically, the first nuclear power deviation is equal to Pr2 minus Pr0, which is 93.2636-98.8457=-5.5821%FP.

[0084] S5: judging the relationship between the first nuclear power deviation and a preset nuclear power deviation.

[0085] S6: if the first nuclear power deviation is within the preset nuclear power deviation, calculating a first set of intermediate parameter data according to the pre-modification nuclear power value, the to-be-modified instantaneous nuclear power value, and the to-be-modified parameter data of the power range.

[0086] Specifically, the preset nuclear power deviation is 5%FP-10%FP, and the first nuclear power deviation obtained by the above calculation is 5.5821%FP, which is within the preset nuclear power deviation range. Therefore, the first set of intermediate parameter data is calculated.

[0087] Further, the first set of intermediate parameters comprises: a first intermediate upper power range coefficient K U,1 , a first intermediate lower power range coefficient K L,1 , and a first intermediate correction nuclear power coefficient Gk1.

[0088] Further, S6 comprises: if the first nuclear power deviation is within the preset nuclear power deviation, substituting the pre-modification nuclear power value Pr0 and the to-be-modified instantaneous nuclear power value Pr2 into a third preset formula to obtain a first intermediate coefficient K; multiplying the first intermediate coefficient K by the to-be-modified upper power range coefficient K U,2 to obtain the first intermediate upper power range coefficient K U,1 , KU,1 =K×K U,2 Multiply the first intermediate coefficient K by the lower coefficient K of the power range to be modified. L,2 Obtain the lower coefficient K of the first intermediate power range L,1 K L,1 =K×K L,2 The first intermediate modified nuclear power coefficient Gk1 is obtained by dividing the proposed modified nuclear power coefficient Gk2 by the first intermediate coefficient K, i.e., Gk1 = Gk2 ÷ K.

[0089] Furthermore, the third preset formula is:

[0090]

[0091] Where Pr0 is the original nuclear power value, Pr2' is the instantaneous nuclear power value to be modified, and K is the first intermediate coefficient.

[0092] Based on Pr2 equaling 93.2636 and Pr0 equaling 98.8457, K is calculated to be 1.0291%FP.

[0093] According to K U,1 =K×K U,2 Substitute the data to calculate K U,1 It is 289460% FP / A.

[0094] According to K L,1 =K×K L,2 Substitute the data to calculate K L,1 It is 309388% FP / A.

[0095] Based on Gk1 = Gk2 ÷ K, substituting the data, we calculate Gk1 to be 0.9718.

[0096] Alternatively, we can calculate a1 = a2 ÷ K, and by substituting the data, we can obtain a1 as 1.8857.

[0097] like Figure 5 As shown in the figure, the nuclear power comparison trend is as follows compared with the original direct modification method, based on the above-mentioned modification method using intermediate values.

[0098] S7: Use the first set of intermediate parameter data and the power range parameter data to be modified in sequence to adjust the core power so that the deviation of the core power in each adjustment is within a safe range.

[0099] Furthermore, the method also includes: S8: If the deviation is greater than the preset nuclear power deviation, calculate the second set of intermediate parameter data and the third set of intermediate parameter data based on the nuclear power value before modification, the instantaneous nuclear power value to be modified, and the parameter data to be modified for the power range.

[0100] S9: Use the second set of intermediate parameter data, the third set of intermediate parameter data, and the parameter data to be modified for the power range to adjust the core power in sequence so that the deviation of the core power in each adjustment is within the safe range.

[0101] It should be noted that if the value is greater than the range of 5%FP-10%FP, then two sets of intermediate parameters need to be calculated, namely the second set of intermediate parameters and the third set of intermediate parameters.

[0102] Furthermore, the second set of intermediate parameter data includes: the upper coefficient K of the second intermediate power range. U,1.1 The lower coefficient K of the second intermediate power range L,1.1 Second intermediate correction nuclear power coefficient Gk 1.1 .

[0103] The third set of intermediate parameter data includes: the upper coefficient K of the third intermediate power range. U,1.2 The lower coefficient K of the third intermediate power range L,1.2 Second intermediate modified nuclear power coefficient Gk 1.2 .

[0104] Furthermore: S8 includes, if the deviation is greater than the preset nuclear power deviation, substituting the original nuclear power value Pr0 and the instantaneous nuclear power value Pr2 to be modified into the fourth preset formula to obtain the second intermediate coefficient K1.

[0105] Multiply the second intermediate coefficient K1 by the upper coefficient K of the power range to be modified. U,2 Obtain the upper coefficient K of the second intermediate power range U,1.1 That is, K U,1.1 =K1×K U,2 .

[0106] Multiply the second intermediate coefficient K1 by the lower coefficient K of the power range to be modified. U,2 Obtain the lower part of the second intermediate power range K L,1.1 That is, K L,1.1 =K1×K L,2 .

[0107] The second intermediate revised nuclear power coefficient Gk is obtained by dividing the proposed modified nuclear power coefficient Gk by the second intermediate coefficient K1. 1.1 That is, Gk 1.1 =Gk2÷K1.

[0108] Substituting the original nuclear power value Pr0 and the proposed instantaneous nuclear power value Pr2 into the fifth preset formula yields the third intermediate coefficient K2.

[0109] Multiply the third intermediate coefficient K2 by the upper coefficient K of the power range to be modified. U,2 Obtain the upper coefficient K of the second intermediate power range U,1.2 That is, KU,1.2 = K2 x K U,2 .

[0110] The second intermediate coefficient K2 is multiplied by the coefficient K of the lower part of the power range to be modified L,2 to obtain the second intermediate coefficient K of the lower part of the power range L,1.2 That is, K L,1.2 = K2 x K L,2 .

[0111] The second intermediate coefficient K2 is multiplied by the coefficient K of the lower part of the power range to be modified 1.2 That is, Gk 1.2 = Gk2 ÷ K2.

[0112] The fourth preset formula is:

[0113]

[0114] wherein K1 is the second intermediate coefficient, Pr0 is the nuclear power value before modification, and Pr2 is the instantaneous nuclear power value to be modified;

[0115] The fifth preset formula is:

[0116]

[0117] wherein K2 is the third intermediate coefficient, Pr0 is the nuclear power value before modification, and Pr2 is the instantaneous nuclear power value to be modified.

[0118] Specifically, as shown in Table 2:

[0119]

[0120] According to the data in Table 2 and the first preset formula, the nuclear power value before modification Pr0 = 0.9500 x (311827 x 0.00017542 + 335877 x 0.00016241) can be calculated. Through calculation, Pr0 is equal to 103.7880% FP.

[0121] According to the data in Table 2 and the second preset formula, Pr2 = 0.95000 x (281287 x 0.00017542 + 300652 x 0.00016241) can be calculated. Through calculation, Pr2 is equal to 93.2636% FP.

[0122] According to Pr2 equal to 93.2636% FP and Pr0 equal to 103.7880% FP, K1 is calculated to be 1.0725.

[0123] According to K U,1.1 = K1 x K U,2 , the data is substituted to calculate K U,1.1is 301681% FP / A.

[0124] According to K L,1.1 = K1 x K L,2 , substituting the data, K L,1.1 is calculated as 1.0350.

[0125] According to Gk 1.1 = Gk2 ÷ K1, substituting the data, Gk 1.1 is calculated as 0.9324.

[0126] At the same time, through a 1.1 = a2 ÷ K1, substituting the data a 1.1 is calculated as 1.8093.

[0127] Specifically, according to Pr2 equal to 93.2636% FP and Pr0 equal to 103.7880% FP, K2 is calculated as 1.0350.

[0128] According to K U,1.2 = K2 x K U,2 , substituting the data, K U,1.2 is calculated as 291127% FP / A.

[0129] According to K L,1.2 = K2 x K L,2 , substituting the data, K L,1.2 is calculated as 311170% FP / A.

[0130] According to Gk 1.2 = Gk2 ÷ K2, substituting the data, Gk 1.2 is calculated as 0.9662.

[0131] At the same time, through a 1.2 = a2 ÷ K2, substituting the data, a 1.2 is calculated as 1.8749.

[0132] It should be noted that the above data calculation may appear rounding, and such deviation is a normal phenomenon in the data processing process, and is usually considered to be within an acceptable error range.

[0133] The method comprises the steps of: obtaining the parameter data before modification of the power range, the parameter data to be modified of the power range and the current data of the ionization chamber of the nuclear instrument, wherein the parameter data before modification of the power range at least comprises the corrected nuclear power coefficient Gk0 before modification, and the nuclear power value before modification and the instantaneous nuclear power value to be modified are calculated; the first nuclear power deviation is calculated again; the relationship between the first nuclear power deviation and the preset nuclear power deviation is judged; if it is within the preset nuclear power deviation, the first group of intermediate parameter data is calculated according to the nuclear power value before modification, the instantaneous nuclear power value to be modified and the parameter data to be modified of the power range; the first group of intermediate parameter data can prevent the unnecessary power change rate fast alarm caused by the short-time nuclear power indication deviation being too large due to the parameter modification.

[0134] It can be understood that the above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application should belong to the scope of the claims of the present application.

Claims

1. A method for adjusting parameter data of a nuclear instrumentation system, characterized in that, include: S1: Obtain the parameter data before the modification of the power range, the parameter data to be modified of the power range, and the current data of the nuclear instrument measured in the ionization chamber, wherein the parameter data before the modification of the power range includes at least the modified nuclear power coefficient Gk0 before modification. S2: Calculate the original core power value based on the parameter data of the power range before modification and the current data; S3: The instantaneous nuclear power value to be modified is obtained based on the modified nuclear power coefficient Gk0 before modification, the parameter data of the power range to be modified, and the current data; S4: Calculate the first nuclear power deviation based on the nuclear power value before modification and the instantaneous nuclear power value to be modified; S5: Determine the relationship between the first core power deviation and the preset core power deviation; S6: If it is within the preset nuclear power deviation, calculate the first set of intermediate parameter data based on the nuclear power value before modification, the instantaneous nuclear power value to be modified, and the parameter data to be modified for the power range; S7: Use the first set of intermediate parameter data and the parameter data to be modified for the power range of the power range to adjust the core power in sequence so that the deviation of the core power in each adjustment is within a safe range.

2. The method for adjusting nuclear instrument system parameter data according to claim 1, characterized in that, The parameter data obtained before the modification of the power range also includes: the upper coefficient K of the power range before modification. U,0 And the lower coefficient K of the power range before modification L,0 ; The parameter data to be modified for the power range includes: the upper coefficient K of the power range to be modified. U,2 Proposed modification to the lower coefficient K of the power range L,2 And the proposed modification of the nuclear power factor Gk2; The measured current data of the ionization chamber by the nuclear instrument includes: upper current data I U Lower current data I L .

3. The method for adjusting nuclear instrumentation system parameter data according to claim 2, characterized in that, S2 includes: adjusting the upper coefficient K of the power range before modification. U,0 The lower coefficient K of the power range before modification L,0 The modified nuclear power coefficient Gk0 before modification, and the upper current data I. U The lower current data I L Substituting into the first preset formula, we obtain the nuclear power value Pr0 before modification; The first preset formula is: Pr0=Gk0×(K U,0 ×I U +K L,0 ×I L )。 4. The method for adjusting nuclear instrument system parameter data according to claim 2, characterized in that, S3 includes: modifying the original nuclear power power coefficient Gk0 and the upper power range coefficient K to be modified. U,2 The proposed modification of the lower coefficient K of the power range L,2 The upper current data I U and the lower current data I L Substituting into the second preset formula, the proposed instantaneous nuclear power value Pr2 is obtained; The second preset formula is: Pr2=Gk0×(K U,2 ×I U +K L,2 ×I L )。 5. The method for adjusting nuclear instrumentation system parameter data according to claim 2, characterized in that, The set of intermediate parameters includes: the upper coefficient K of the first intermediate power range. U,1 The lower coefficient K of the first intermediate power range L,1 And the first intermediate correction nuclear power coefficient Gk1.

6. The method for adjusting nuclear instrumentation system parameter data according to claim 5, characterized in that, S6 includes: If the nuclear power deviation is within the preset nuclear power deviation, the nuclear power value Pr0 before modification and the instantaneous nuclear power value Pr2 to be modified are substituted into the third preset formula to obtain the first intermediate coefficient K; Multiply the first intermediate coefficient K by the upper coefficient K of the power range to be modified. U,2 Obtain the upper coefficient K of the first intermediate power range U,1 ; Multiply the first intermediate coefficient K by the lower coefficient K of the power range to be modified. L,2 Obtain the lower coefficient K of the first intermediate power range L,1 ; The first intermediate modified nuclear power coefficient Gk1 is obtained by dividing the proposed modified nuclear power coefficient Gk2 by the first intermediate coefficient.

7. The method for adjusting nuclear instrumentation system parameter data according to claim 6, characterized in that, The third preset formula is: Wherein, Pr0 is the nuclear power value before modification, Pr2 is the instantaneous nuclear power value to be modified, and K is the first intermediate coefficient.

8. The method for adjusting nuclear instrumentation system parameter data according to claim 1, characterized in that, The method further includes: S8: If the deviation is greater than the preset nuclear power deviation, calculate the second set of intermediate parameter data and the third set of intermediate parameter data based on the nuclear power value before modification, the instantaneous nuclear power value to be modified, and the parameter data to be modified for the power range. S9: The core power is adjusted sequentially using the second set of intermediate parameter data, the third set of intermediate parameter data, and the parameter data to be modified for the power range, so that the deviation of the core power in each adjustment is within a safe range.

9. The method for adjusting nuclear instrumentation system parameter data according to claim 8, characterized in that, The second set of intermediate parameter data includes: the upper coefficient K of the second intermediate power range. U,1.1 The lower coefficient K of the second intermediate power range L,1.1 Second intermediate correction nuclear power coefficient Gk 1.1 ; The third set of intermediate parameter data includes: the upper coefficient K of the third intermediate power range. U,1.2 The lower coefficient K of the third intermediate power range L,1.2 Second intermediate modified nuclear power coefficient Gk 1.2 .

10. The method for adjusting nuclear instrumentation system parameter data according to claim 9, characterized in that, S8 includes, if the deviation is greater than the preset nuclear power deviation, substituting the nuclear power value Pr0 before modification and the instantaneous nuclear power value Pr2 to be modified into the fourth preset formula to obtain the second intermediate coefficient K1; Multiply the second intermediate coefficient K1 by the upper coefficient K of the power range to be modified. U,2 Obtain the upper coefficient K of the second intermediate power range U,1.1 ; Multiply the second intermediate coefficient K1 by the lower coefficient K of the power range to be modified. L,2 The lower part of the second intermediate power range K is obtained. L,1.1 ; Dividing the proposed modified nuclear power coefficient Gk2 by the second intermediate coefficient K1 yields the second intermediate modified nuclear power coefficient Gk. 1.1 ; Substituting the original nuclear power value Pr0 and the proposed instantaneous nuclear power value Pr2 into the fifth preset formula, we obtain the third intermediate coefficient K2. Multiply the third intermediate coefficient K2 by the upper coefficient K of the power range to be modified. U,2 Obtain the upper coefficient K of the second intermediate power range U,1.2 ; Multiply the second intermediate coefficient K2 by the lower coefficient K of the power range to be modified. L,2 Obtain the lower coefficient K of the second intermediate power range L,1.2 ; Dividing the proposed modified nuclear power coefficient Gk2 by the second intermediate coefficient K2 yields the second intermediate modified nuclear power coefficient Gk. 1.2 ; The fourth preset formula is: Wherein, K1 is the second intermediate coefficient, Pr0 is the nuclear power value before modification, and Pr2 is the instantaneous nuclear power value to be modified; The fifth preset formula is: Wherein, K2 is the third intermediate coefficient, Pr0 is the nuclear power value before modification, and Pr2 is the instantaneous nuclear power value to be modified.

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