ML20217J069
| ML20217J069 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/31/1997 |
| From: | Reagan J, Tuley C, Tamera Williams WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML19313D007 | List: |
| References | |
| WCAP-10992, WCAP-10992-R05, WCAP-10992-R5, NUDOCS 9710200071 | |
| Download: ML20217J069 (98) | |
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WESTINGHOUSE NON-PROPRIETARY CLASS 3 WCAP-10992 Rev.5
} WESTINGHOUSE SETPOINT METIlODOLOGY FOR PROTECTION SYSTEMS MILLSTONE NUCLEAR POWER STATION UNIT 3 24 MONTH FUEL CYCLE EVALUATION August 1997 T. P. Williams J. R. Reagan C. R. Tuley 1
E WESTINGHOUSE ELECTRIC CORPORATION Nuclear Services Division P. O. Box 355 Pittsburgh Pennsylvania 15230-0355
@ 1997 Westinghouse Electric Corporation All Rights Reserved
i.
ACKNOWLEDGEMENTS The authors.of this report wish to acknowledge N. Bhatt, D. Asay, S. V; Andre'and-M. T. Bowler for their cooperation and technical assistance throughout the Millstone Unit 3 Extended Surveillance Interval Program.
I k
9 i
TABLE OF CONTENTS 4
Section Title - Page 1.0 -
INTRO D U CTI O N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
- - - 1.1
- References / S tandards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2.0.- .COMEINATION OF UNCERTAINTY COMPONENTS . . . . . . . , . . . . . . . . . . . 3 2.1 - M e th od ology . . . . ._ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
- 2.2 Sensor Allowances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 .
2.3 . ic k Allo wance s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 i 2.4 4
Proce s s Allowance s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.5 Measurement and Test Equipment Accuracy . . . . . . . . . . . . , . . . . . ... . . 9 i
n 2.6 Re fe re n ce s / S tandard s . . . . . . . -. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . '10
- 3.0 PROTECTION SYSTEM SETPOINT METHODOLOGY . . . . . . . . . . . . . . . . . 11 3.1 argin Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 l 3.2 Definitions For Protection System Setpoint Tolerances . . . . , . . . . . . , . . 12 3.3 Cross Reference - SAMA PMC 20.1-1973 and ANSI /ISA-S51.1-1979 . . . 21
'3.4' References / Standards , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 22 i
4 4.0 APPLICATION OF THE SETPOINT METHODOLOGY . . . . . . . . . . . . , , . . 64 4.1 Uncertainty Calculation Basic Assumptions / Premises . . . . . . . . . . . . . . . 64 4.2 Sensor / Transmitter Operability Determination Program and Criteria . . . . . 66 4.3 Process Rack Operability Determination Program and Criteria . . . . . . . . . 68 4.4 Application to the Plant Technical Specifications . . . , . . . . . . . . . . . . . 70 2
4.5 References / Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 w
4
- APPENDIX A 4
- SAMPLE MILLSTONE UNIT 3 SETPOINT TECHNICAL SPECIFICATIONS A-1 l
1
.t 11
+
5 I
- 4 , . - - , - .- - - , , .,. . . - , , -,-.-x -.y,,,,- - ,
~ - . - .- - ~ . , . , - - - . . . - -- . - .. -
TABLE OF CONTENTS Section Title Page TABLE 31 POWER RANGE, NEUTRON FLUX - LOW & IllGH . . . . . . . . . . 23 TABLE 3 2 POWER RANGE, NEUTRON FLUX - HIGH N- 1 LOOP OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 TABLE 3-3 - POWER RANGE, NEUTRON FLUX HIGH POSITIVE AND N EG ATIVE RATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 TABLE 3-4 INTERMEDIATE RANGF. NEUTRON FLUX . . . . . . . . . . . ..... 26 TABLE 3-5 SOURCE RANGE NEUTRON FLUX . . . . . . . . . . . . . . . . . . . . . . 27
-TABLE 3-6 OVERTEMPERATURE AT (CORE BURNDOWN EFFECTS) (N LOOP) .................................. 28 TABLE 3-7 OVERPOWER AT (CORE BURNDOWN EFFECTS)
(N LOO P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 TABLE 3-8 OVERTEMPERATURE AT (CORE BURNDOWN EFFECTS) (N-1 LOOP) . . . . . ................ .......... 32 TABLE 3-9 OVERPOWER AT (CORE BURNDOWN EFFECTS)
(N - 1 LOO P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 TABLE 3-10 PRESSURIZER PRESSURE - LOW & HIGH (ROSEMOUNT I154GP9 TRANSMI1TER) . . . . . . . . . . . . . , , . . 36 TABLE 3-11 PRE 3SURIZER PRESSURE - SI (ROSEMOUNT 1154GPo TRANSMITTER) . . . . . . . . . . . . . . . , . . 37 TABLE 3-12 PRESSURIZER WATER LEVEL - HIGH (VERITRAK 76DPl TRANSMITTER) ...................... 38 TABLE 3-13 PRESSURIZER WATER LEVEL - HIGH
-(ROSEMOUNT I153HD5 TRANSMITTER) .................. 39 ill
i TABLE OF CONTENTS
- Section Title Page TABLE 3-14 STEAM GENERATOR WATER LEVEL - LOW-LOW (FLB) (ROSEMOUNT 1154DH4 TRANSMITTER) . . . . . . . . . . . . . 40 TABLE 3-15 STEAM GENERATOR WATER LEVEL - LOW-LOW (LONF) (ROSEMOUNT ll54DH4 TRANSMITTER) . . . . . . . . . . . . 42 TABLE 3-16 STEAM GENERATOR WATER LEVEL - HIGH HIGH (ROSEMOUNT 1154DH4 TRANSMITTER) ...............,,. 44 TABLE 3-17 REACTOR COOLANT PUMP UNDERSPEED . . . . . . . . . . . . . . , . 46 TABLE 3-18 CONTAINMENT PRESSURE - HIGH 1, HIGH 2, HIGH 3 (ROSEMOUNT 1153AB6 TRANSMITER) . . . . . . . . . . . . 47 TABLE 3-19 STEAMLINE PRESSURE - LOW SI (ROSEMOUNT 1153GB9 TRANSMITTER) .................. 48 TABLE 3 20 NEGATIVE STEAM PRESSURE RATE - HIGH , . . . . . . . . . . . . . . 49 TABLE 3 21 RCS LOW FLOW (N LOOP)
(ROSEMOUNT 1153HD5 TRANSMITTER) .................. 50 TABLE 3-22 RCS LOW FLOW (N-1 LOOP)
(ROSEMOUNT ll53HD5 TRANSMITTER) .............. ... 51 TABLE 3 23 TAVG, LOW AND LOW LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 TABLE 3-24 REACTOR PROTECTION SYSTEM / ENGINEERED SAFETY FEATURES ACTUATION SYSTEM CHANNEL UNCERTAINTY ALLOWANCES . . . . . . . . . . . . . . . . 54 TABLE 3-25 OVERTEMPERATURE AT CALCULATIONS . . . . . . . . . . . . . . . . . 56 TABLE 3 26 OVERPOWER AT CALCULATIONS . . . . . . . . . . . . . . . . . . . . . . . 59 iv d,
TABLE OF CONTENTS Section Tide Page i . TABLE 3 27 AP MEASUREMENTS EXPRESSED IN FLOW UNITS . . . . . . . . . . 61
~ TABLE 41 WESTINGHOUSE PROTECTION SYSTEM STS SETPOINT INPUTS . . . ................................ 73 APPENDIX A SAMPLE MILLS'iVNE UNIT 3 SETPOINT TECHNICAL i SPECIFICATIONS A-1 l
4 e
V
. ...m . _ . _ .. _.__ _ . _ _ _ . .. _. _ _ - . _ _ -. _ _ _ _ _ ._ _ ._ , _ . _ . .
}
m i
. 1.0
- INTRODUCTION .
- , ' In Generic Letter 91-04,l'l ths NRC has noted that uncertainty calculations should be ,
- performed in a manner which results in values at a high probability and a hi 1t co>.3dence .
level, he implication being a requirement for a more statistically rigorous calculation. In addition,' Generic 1.ctter 91-18:23 clarifies the NRC's definition of operability, in response to--
1 these documents, Westinghouse has modified the basic uncertaimy algorith 1. To address the requirements for a definitive _ basis for drift, explicit calculations were made to determine appropriate values for the transmitters and process racks.
- The basic Westinghouse approach to an uncertainty calculation is to achieve an understanding of the plant instrumentation; calibration and operability verification processes. The uncertainty
- algorithm resulting from this understaniing can be function specific, i.e., is very likely different for two functions if their calibration 'or operability determination processes are different. Effort is expended in determination.of what parameters are dependent statistically._
or functionally. Those parameters that are determined to be independent are treated -
accordingly. This allows the use of a Square Root Sum-Of-He-Squares (SRSS) summation of the various components. A direct benefit of the use of this technique is increased margin in the total allowance. For those parameters det rmined to be dependent, ~ appropri :
- (conservative) summation techniques are utilized. An explanation of the overall approach is provided in Section' 2.0, Section 3.0 provides a description, or definition, of each of the various components, to allow a clear understanding of the methodology Also provided is a detailed example of each setpoint margin calculation demonstrating the methodology and noting how each parameter value is utilized. In all cases, margin exists between the summation and the total allowance.
7 L
l-
- Section 4.0 provides a description of the methodology utilized in the determination of the
-Millstone Unit 3 Technical Specifications and an explanation of the relationship tatween a
- trip setpoint and an operability verification. An Appendix is provided noting a recommended set of Technical Specifications using the plant specific data and the revised Westinghouse l = approach that reflects the plant specific operability verification process, 1.1 References / Standards i
s ~[1]. Generic Letter 91-04,1991, " Changes in Technical Specification Surveillance Intervals to Accommodate a 24 Month Fuel Cycle."
[2] Generic Letter 91-18,1991, "Information to Licensees Regarding Two NRC Inspection Manual Sections on Resolution of Degraded and Nonconforming Conditions and on Operability."
2
- 2.0 - 1 COMBINATION OF UNCERTAINTY COMPONENTS 2.1 - Methodology He' methodology used to combine the uncertainty components for a channel is an appropriate combination of those proups which are statistically and functionally independent, nose . l uncertainties which are not independent are appropriately treated (or conservatively treated by arithmetic summation) and then systematically combined with the independent terms.
- he basic methodology used is the SRSS technique which has been utilized in other Westinghouse reports. This technique, or others of a similar nature, has been used in t
WCAP-10395 " and WCAP-8557L21 WCAP 8567 is approved by the NRC noting:
acceptability of statistical techniques for the application requested. Also, various ANSI,
- American Nuclear Society, and Instrument Society of America (ISA) standards approve the D fl. He use of probabilistic and statistical technique.s in determining safety-related setpoints basic methodology used in this report is essentially the same as that noted in an ISA paper presented in 1992"1 The relationship between the uncertainty components and the calculated uncertainty for a.
channel is noted in Eq. 2.1,
' CSA = ((PMA)' + (PEA)' + (SMTE + SD)' + (SLTE + SCA)* + (SPEl' +
. (STE)* + (SRA)* + (RMTE + RD)* + (RMTE + RCA)* + (RMTE +
RCSA)' + (RTE)'}"* + EA + BIAS (Eq 2.1) 3
where:
CSA = Channel Statistical Allowance
-PMA- = Process Measurement Accuracy PEA . = Primary Element Accuracy SMTE~ = Sensor Measurement and Test Equipment Accuracy SD = Sensor Drift SCA = Sensor Calibration Accuracy SPE- rSensor Pressure Effects STE = Sensor Temperature Effects SRA = Sensor Reference Accuracy RMTE = Rack Measurement and Test Equipment Accuracy RD = Rack Drift RCA = Rack Calibration Accuracy RCSA_ = Rack Comparator Setting Accuracy RTE - = Rack Temperature Effects l
-EA. = Environmental' Allowance BIAS =One directional, known magnitude As can be seen in the equation, drift and calibration accuracv allowances are treated as
.. dependent parameters with the measurement and test equipment uncertainties. The environmental allo' wance is not necessarily considered dependent with all other parameters. -
' but as an additional degree of conservatism is added to the statistical sum, Bias terms are one Tdirectional with a known magnitude and are added to the statistical sum. The calibration .
terms are treated in the same radical based on the Generic 1.etter 91-04"1 requirement for general trending. Millstone Unit 3 has identified that trending will be performed. 'Ihis results in a net reduction of the CSA magnitude (over that which would be determined if trending was not performed).
4-
- 2.2 - - Sensor Allowances -
Six parameters are considered to be sensor allowances: SCA, SRA, SMTE, SD, STE, and SPE'- I
- (see Table 3-24). Of these parameters, three are considered'to be independent (SRA, STE and SPE), and three are considered dependent with at least one other term (SCA, SMTE and_SD).
SRA.is the manufacturer's reference accuracy that is achievable by the device: .nis term is --
introduced to address repeatability and hysteresis concerns when only performing a single
. pass calibration, i.e., one up and one down."1 STE and SPE are considered to be independent
- due to the manner in which the instrumentation is checked;'i.e., the instrumentation is calibrated and drift determined under conditions in which pressure and temperature are -
jwmed constant. 'An example of this would be as follows. Assume a sensor is placed in j some position in the containment during a refueling outage. After placement, an instrument technician calibrates the sensor. His calibration is performed at ambient pressure and . '
- temperature conditions. - Some time later with the plant shutdown, an instrument technician checks for sensor drift. Using the same technique as for calibrating the sensor, the technician determines if the sensor has drifted. De conditions under which this determination is made are again ambient pressure and temperature. The temperature and pressure should be essentially the same at both measurements and thus should have no significant impact on the drift determination and are, therefore, independent of the drift allowance. For this evaluation, transmitter "as left / as found" data was evalnated to project a 30 month drift and process rack "as left / as found" data was evaluated for a 3 month drift for all channels noted in this document.
SCA SMTE and SD are considered to be dependent for the same reason that STE and SPE are considered independent; i.e., due to the manner in which the instrumentation is checked.
Instrumentation calibration techniques use the same process as determining instrument drift.
.That is, the end result of the two is the same. When calibrating a sensor, the sensor outpu'. is checked to determine' if it is accurately representing the input. The 'same is performed for a determination of the sensor drift. The "as left / as found" data are recorded to determine-whether the sensor has performed its intended function in the past and will it continue to perform this function for future cycles as specified by the manufacturer's specifications.
5
~
ne transmitter "as left / as found" data was evaluated for populatica normality and outliers -
and a 30 month uncertainty determined at a 95% probability and a 95% confidence level. -A similar evaluation was perfonned for the process racks for a 3 month uncertainty.~ The statistically derived calibration accuracy and drift values (for 30 months or 3 months, as appropriate) were combined 'with the measurement and test'eq'uipment accuracy term to form the dependent relationships. A hypothetical example of the impact of this treatment for a level transmitter is (sensor parameters only)f 4
r 7 +a,c
~SCA =
SRA =
SMTE =
SPE =
STE =
SD =
L J l
l excerpting the sensor portion of Equation 2.1 results in;
((SMTE + SCA)* + (SMTE + SD)* + (SPE)* + (STE)' + (SRA)')"'
or -
I l'" = 2.0%
Assuming no dependencies for any of the parameters results in the following:
((SCA)' + (SMTE)' + (SD)' + (SPE)' + (STE)' + (SRA)'}"* (Eq. 2.2)
- or -
I l'" = 1.5%
Thus it can be seen that the approach represented by Equation 2.1, which accounts for dependent parameters, results in a more conservative summation of the allowances.
o 6-
4 2.3 Rack Allowances Five parameters, as noted by Table 3-24, are considered to be rack allowances: RCA, RMTE, RCSA, RTE, and RD. Three of these parameters (RCA, RMTE, and RD) are considered to '
be dependent for much the same reason as outlined for sensors in Section 2.2 When calibrating or determining drift In the racks for a specific channel, the processes are performed at i.ssentially constant temperature; i.e., ambient temperature (which is reasonably controlled).
Because of this, the RTE parameter is considered to be independent of any factors for calibration or drift. However, the same cannot be said for the other rack parameters. As noted in Section 2.2, when calibrating or determining drift for a channel, the same end result is desired; that is, the point at which the bistable changes state. For this evaluatic>n, "as left /
as found" data was evaluated to project a calibration uncertainty, rack drift and a comparator .
setting accuracy based on the 3 mruth mrveillance interval requirement for each channel. l Based on this logic, th se frtors have been conservatively summed to form several independent groupings (see Equation 2.1). The inspact of this approach (formation of independent groups based on dependent compcnents) is significant. For the hypothetical example of a level transmitter channel, ushg the same approach outlined in Equations 2.1 and 2.2 results in the following:
r -
+a.c RCA =
RMTE =
RCSA =
RTE =
RD =
L J excerpting the rack portion of Equation 2.1 results in;
((RMTE + RCA)' + (RMTE + RCSA)' +(RMTE + RD)' + (RTE)')"
- or -
1 I ]~ = 1.S%
7 4
r ----.-,---w- y,---n , ., .,.,,.-.n,-,..g-, + - - - , - ,.,,.w--,.m-,, c.-~-,-w,, e,,---ww-.-,-, ., ,a, , , v. .-g+--r,-w,,rv,,-
4 Assuming no dependencies for any of the parameters yields the following less conservative resultst d
((RCA)' + (RMTE)* + (RCSA)* + (RD)* + (RTE)')N (Eq. 23) 1
. or *
/ /*" = /J%
~
Thus, the use of Equation 2.1 is conservative for rack effects and for sensor effects, j Therefore, accounting for dependencies in the treatment of these allowances provides a conservative result.
t 4
t 2A Process Allowances '
Finally, the PMA and PEA parameters are considered to be independent of both sensor and i
rack parameters. PMA provides allowances for the non instrument related effects; e.g.,
- neutron flux, calorimetric power uncertainty assumptions, fluid density changes, and temperature stratification assumptions. PMA may consist of more than one independent uncertainty allowance. - PEA accounts for uncertainties due to metering devices, such as elbows, venturis, and orifice plates. Thus, these parameters have been factored into Equation 2.1 as independent quantitles, it should be noted that treatment as an independent parameter does not preclude determination that a PMA or PEA term should be treated as a bias. - If that is determined appropriate, Equation 2.1 would be modified such that the affected term would l be treated by arithmetic summation as deemed necessary.
1 2
k l-g a
J 1
,, , , ~ . , ,,.r
._,_. _ . . _ _ . , _ . . , , ...,.,..,,r.,_ r. m , _,,,...,,,,.y_,.e.n_ . , _ . . . - _ _ . . ....___...,-.my
4 2.5 - Measurement and Test Equipment Accuracy .
Based on information from Northeast Nuclear Energy Company (NNECO), it was concluded that the equipment used for calibration and functional testing of the transmitters and racks does not meet SAMA Standard PMC 20.1 1973m with regards to allowed exclusion from the calculation. This implies that test equipment without an accuracy of 10% or less of the
- calibration accuracy is required to be included in the uncertainty calculations of Equations l
L 2.1, and 3.1. NNECO procedures were reviewed to determine the appropriate uncertainty for cach function evaluated, These M&TE uncertainties were included in the calculations, as -
seen on the tables included in this report, n
?i;
.i-9
. . - _ , = _ . -__ _ -
..ssi i . - - - - ' " -'- ----
1 l
2.6 References / Standards
[1] Grigsby, J. M., Spier E. M., Tuley, C. P... " Statistical Evaluation of LOCA Heat Source Uncertainty," WCAP 10395 (Proprietary), WCAP 10396 (Non Proprietary).
November 1983.
[2] Chelemer H., Boman, L 11., and Sharp D. R., " improved Thermal Design Procedure,"
WCAP 8567 (Proprietary), WCAP 8568 (Non Proprietary), July,1975.
[3] ANSI /ANS Standard 58.41979, " Criteria for Technical Specifications for Nuclear Power Stations."
[4] ISA Standard S67.04,1994, "Setpoints for Nuclear Safety Related Instrumentation Used in Nuclear Power Plants."
[5] Tuley, C. R., Williams, T. P., "The Significance of Verifying the SAMA PMC 20.1-1973 Defined Reference Accuracy for the Westinghouse Setpoint Methodology,"
instrumentation, Controls and Automation in the Power Industry, Vol. 35, Proceedings of the Thirty-Fifth Power Insrumentation Symposium (2d Annual ISA/EPRI Joint Controls and Automation Conference), Kansas City, Mo., June,1992, p. 497,
[6] Generic Letter 9104,1991, " Char.ges in Technical Specification Surveillance Intervals
~
to Accommodate a 24 Month Fuel Cycle."
[7] Scientific Apparatus Manufacturers Association, Standard PMC 20.11973 " Process Measurement and Control Terminology."
10
l l
3.0 PROTECTION SYSTEM SETPOINT METHOD 01,0GY '
3.1 Margin Calculation As noted in Section 2.0, Westinghouse utilizes the square root of the sum of the squares for summation of the various components of the channel uncertainty. This approach is valid where no dependency is present. Arithmetic summation is a conservative treatment when a dependency between two or more parameters exists. 'the equation used to determine the margin, and thus the acceptability of the parameter values used, is:
1 Margin = TA - ((PMA)* + (PEA)' + (SMTE + SCA)' + (SMTE + SD)* +
(SPE)" + (STE)* + (SRA)* + (RMTE + RCA)' + (RMT2 +
RCSA)* + (RMTE + RD)* + (RTE)') - EA BIAS (Eq. 3.1) where:
TA = Total Allowance (which is defined as) Safety Analysis Limit - Nominal Trip Serpoint, and_ all other parameters are as defined for Equation 2.1.
This equation is appropriate when trending of transmitter calibration and drift and process rack calibration and drift values is taking place. Using Equation 2.1, Equation 3.1 may be '
. simplified to:
Margin = TA CSA (Eq. 3.2)
Tables 3-1 through 3 23 provide individual component uncertainties and CSA calculations for the protection functions noted in Tables 2.21 and 3.3-4 of the Millstone Unit 3 Technical Specifications. Table 3 24 provides a summary of the Reactor Protection System /
Engineered Safety Features Actuation System Channel Uncertainty Allowances for Millstone Unit 3 and includes Safety Analysis and Technical Specification values. Total Allowance and 11 ae.---- up r--' -'wy-w-*'-W+- N-^-- - "'- *'
Margin. Westinghouse typically reports values in these tables to ,1e decimal place using the l
conventional technique of rounding down values less than 0.05 and rounding up values greater than or equal to 0.05. Parameters reported in Tables 31 through 3 24 as "0.0" have j been identified as having a value of s 0.04. Parameters reported as "0" or " " in the tables are not applicable (i.e., have no value) for that channel.
3.2 Definitions For Protection System Setpoint Tolerances To insure a clear understanding of the channel uncertainty values used in this report, the followirg definitions are noted:
a As Found The condition in which a transmitter, process rack module or process instrument loop is found after a period of operation. For example, after a period of operation, a transmitter was found to deviate from the ideal condition by 0.5% span. This would be the "as found" condition.
a As left he condition in which a transmitter, process rack module or process instrument loop is left after calibration or bistable trip setpoint verification. This condition is typically better than the calibration accuracy for that piece of equipment. For example, the permitted calibration accuracy for a transmitter is i0.5% of span, while the worst measured deviation from the ideal condition after calibration is +0.1% span. In this instance, if the calibration was stopped at this point (i.e., no additional efforts were made to decrease the deviation) the "as left" error would be +0.1% spa i.
12
a Channel
%e sensing and process equipment, i.e., transmitter to bistable, for one input to the voting logic of a protection function. Westinghouse designs protection functions with voting logic made up of multiple channels, e.g. 2/4 Steam Generator L4 vel Low Low channels must have two bistables in the tripped condition for a Reactor Trip to be initiated, a Channel Statistical Allowance (CSA)
,ne combination of the various channel uncertainties via SRSS. It includes both instrument (sensor and process rack) uncertainties and non instrument related effects
-(Process Measurement Accuracy). This parameter is compared with the Total Allowance for determination of instrument channel margin. .
m Environmental Allowance (EA)
De change in a process signal (transmitter or process rack output) due to adverse
- environmental conditions from a limiting accident condition. Typically this value is determined from a conservative set of enveloping conditions and may represent the following:
a) temperature effects on a transmitter, b) radiation effects on a transmitter, c) seismic effects on a transmitter, d) temperature effects on a level transmitter reference leg, e) temperature effects on signal cable insulation, and f) seismic effects on process racks.
13
a Margin The calculated difference (in % instrument span) between the Total Allowance and the Channel Statistical Allowance, a Nominal Trip Setpoint (NTS)
A bistable trip setpoint in plant Technical Specifications or plant administrative procedures. This value is the nominal value to which the bistable is set, as accurately as reasonably achievable.
s Normalization ne process of establishing a re!stionship, or link, between a process parameter and an instrument channel. This is in contrast with a calibration process. A calibration process is performed with independent known values, i.e., a bistable is calibrated to change state when a specific voltage is reached. This voltage corresponds to a process parameter magnitude with the relationship established through the scaling process. A normalization process typically involves an indirect measurement, e.g., determination of Steam Flow via the Ap drop across a flow restrictor. The flow coefficient is not known for this condition, effectivel /an orifice, therefore a mass balance between Feedwater Flow and Steam Row can be made. With the Feedwater Flow known through measurement via the venturi, the Steam Flow is normalized, a Process Loop (Instrument Process Loop)
The process equipment for a single channel of a protection function.
14
m Process Measurement Acetracy (PMA)
Allowance for non. instrument related effects which have a direct bearing on the accuracy of an instrument channel's reading, e.g., temperature stratification in a large diameter pipe, fluid density in a pipe or vessel.
m Primary Element Accuracy (PEA)
Uncertainty due to the use of a metering device, e.g., venturi, orifice, or elbow.
Typically, this is a calculated or measured accuracy for the device.
a Process Racks The analog modules downstream of the transmitter or sensing device, which condition a signal and act upon it prior to input to a voting logic system. For Westinghouse process systems, this includes all the equipment contained in the process equipment cabinets, e.g., conversion resistor, transmitter power supply, R/E, lead / lag, rate, lag functions, function generator, summator, control / protection isolator, and bistable for analog functions. The go/no go signal generated by the bistable is the output of the last module in the analog process rack instrument loop and is the input to the voting logic.
m R/E Resistance (R) to voltage (E) conversion module. The RTD output (change in resistance as a function of temperature) is converted to a process loop working parameter (voltage) by this analog module.
15 U
a Rack Calibration Accuracy (RCA)
The reference (calibration) accuracy, as defined by SAMA Standard PMC 20.1 1973 1H for a process loop string. Inherent in this definition is the verification of the following under a reference set of conditions; 1) conformity *,2) hysteresis
- and l
- 3) repeatability'i. %e Westinghouse definition of a process loop includes all modules in a specific channel. Also it is assumed that the Individual modules are calibrated to a particular tolerance and that the process loop as a string is verified to be calibrated to a specific tolerance. %e tolerance for the string is typically less than the arithmetic sum or SRSS of the individual module tolerances. Als forces calibration of the process loop without a systematic bias in the individual module calibrations, i.e., as left values for individual modules must be compensating in sign and magnitude.
l For an analog channel, an ind'vidual rnodule is typically calibrated to within [
t
]'", with the entire process loop typically calibrated to within [ ] '" .
m Rack Comparator Setting Accuracy (RCSA) he reference (calibration) accuracy, as defined by SAMA Standard PMC 20.1 197314, of the instrument loop comparator (bistable). Inherent in this definition is the verification of repeatabilityl under a reference set of conditions. For a single input bistable (fixed setpoint) the typical calibration tolerance is [ l'". his assumes that comparator nonlinearities are comper. sated by the setpoint. For a dual input bistable (floating setpoint) the typical calibration tolerance is [ l'".
his allows for nonlinearities between the two inputs. In many plants calibration of the bistable is included as an integral part of the rack calibration, i.e., string calibration.
16
m Rack Drift (RD)
The change in input output relationship over a period of time at reference conditions, e.g., at constant temperature. A typical allowance value assumed for this parameter is it.0% span for analog channels. An example of RD is: for an "as found" value of 0.5% span and an "as left" value of +0.1% span, the magnitude of the drift would be
{( 0.5) - (+0.1) = -0.6% span) in the negative direction. For this evaluation, a maximum surveillance interval of 3 months was assumed when projecting drift allowance, as noted in the uncertainty tables.
m Rack Measurement & Test Equipment Accuracy (RMTE)
The accuracy of the test equipment (typically a transmitter simulator, voltage or current power supply, and DVht) used to calibrate a process loop in the racks. When the magnitude of RMTE meets the requirements of SAMA FMC 20.1 1973W it is considered an integral part of RCA. Magnitudes in excess of the 10:1 limit are explicitly included in Westinghouse calculations, a Rack Temperature Effects (RTE)
Change in input-output relationship for the process rack module string due to a change in the ambient environmental conditions (temperature, humidity, voltage and frequency) from the reference calibration conditions, it has been determined that temperature is the most significant, with the other parameters being second order effects. For process instrumentation, a value of ( ]* is used for analog channel temperature effects. It is assumed that calibration is performed at a nominal ambient temperature of +70 'F with an upper extreme of +120 *F (+50 'F AT) and a lower extreme of +40 'F.
17
a Range he upper and lower limits of the operating region for a device, e.g., for a Pressurizer Pressure transmitter,1700 to 2500 psig, for Steam Generater Level, approximately .
120.8 to 31.5 inches of water column. This is not necessarily the calibrated span of the device, although quite often the two are close. For further information see SAMA PMC 20.1 1973'H.
l
-a Safety Analysis Limit (sal,)
The parameter value assumed in a transient analysis or other plant operating limit at which a reactor trip or actuation function is initiated, a Sent.r Calibration Accuracy (SCA)
The calibration accuracy for a Sensor or transmitter as defm' ed by the Millstone Unit 3 calibration procedures. For transmitters, this accuracy is typically [
]'" as defined by NNECO Procedures. Utilizing Westinghouse recommendations for RTD cross-calibrathn, this accuracy is typically [ ]+"for the Hot and Cold Leg RTDs.
m Sensor Drift (SD)
The change in input output relationship over a period of time at reference calibration
- conditions, e.g., at constant temperature. An example of SD is: for an "as found" value of +0.5% span and an "as left" value of +0.1% span, the magnitude of the drift would be ((+0.5) - (+0.1) = +0.4% span) in the positive direction. - For this evaluation, a maximum surveillance interval of 30 months was assumed when projecting drift allowance with exceptions as noted in the uncertainty tables.
18
m Sensor hieasurement & Test Equipment Accuracy (Sh1TE) ne accuracy of the test equipment (typically a high accuracy local rea.iout gauge and DVM) used to calibrate a sensor or transmitter in the field or in a call.bration laboratory. When the magnitude of SMTE meets the requirements of SAMA PMC 20.1 1973W it is considered an integral part of SCA. Magaitudes in excess of the 10:1 limit are explicitly included in Westinghouse calculations, a Sensor Pressure Effects (SPE)
The change in input-output relationship due to a change in the static head pressure l from the calibration conditions or the accuracy to which a correction factor is introduced for the difference between calibration and operating conditions for a Ap l transmitter.
l u Sensor Temperature Effects (STE)
The change in input-output relationship due to a change in the ambient environmental conditions (temperature, humidity, voltage and frequency) from the reference calibration conditions. It has been determined that temperature is the most significant, with the other parameters being second order effects. It is assumed that calibration is performed at a nominal ambient temperature of +70 'F with an upper extreme of
+120 *F and a lower extreme of +40 'F.
m Sensor Refe ence Accuracy The reference accuracy that is achievable by the device as specified in the manufacturers specification sheets. Reference (calibration) accuracy for a sensor or transmitter as defined by SAMA Standard PMC 20.1-19731 0 Inherent in this 19
__._.__.__.._.______.m_.__._______._- __
.i .
I definition is the verification of the following under a reference set of conditions; l)
- conformityl28,2) hysteresis"3 and 3) repeatability"I, This term is introduced into the 4
uncertainty calculation to address repeatability concerns when only performing a !
calibration, i.e., one up and one down or repeatability and hysteresis when performing -
! a single pass calibration in only one direction. .
s Span 1
4 The region for which a device is calibrated and verified to be operable, e.g., for a Pressurizer Pressure transmitter,800 psi, for Steam Generator Level, approximately 89.3 inches of water f column.. For Pressurizer Pressure, considerable suppression of the zero is exhibited. !
eSRSS- .
Square root of the sum of the squares,i.e.,
e=/(a)*+(b)'+(c)' f i
as approved for use in setpoint calculations by ISA Standard S67.041994 '1 1 a Total Allowance (TA)
The calculated' difference between the Safety Analysis Limit and the Nominal Trip Setpoint (SAL - NTS) in % instrument span. Two examples of the calculation of TA rte:
1 20 ;
e i
a Steam Gsnerator Level Low Low SAL 0% LVL NTS - 18% LVL TA 18% LVL If the instrument span = 100% LVL, then u - (18% imo_ (100% een) 18.0% w (100% im0 l
l a Pressurizer Pressure - Low Trip SAL 1860 psia NTS - 1900 psia TA 40 psia If the instrument span = 800 psi, then u - (40 8'de)(800pse)
. (100% een) - 5.0% w 3.3 Cross Reference - SAMA PMC 20.1 1973 and ANSI /ISA S51,1 1979 SAMA Standard PMC 20.1-1973, "Proceu Measurement & Control Terminology" is no longer ir print and thus is unavaikble from SAMA. It has been replaced by ANSI /ISA SSI.1 1979, " Process Instrumentation Terminology" and is available from the Instrument Society of America. Noted below is a cross reference listing of equivalent definitions between the two standards for terms used in this document. Even though the SAMA standard is no longer available, Westirghouse prefers and continues to use the SAMA definitions.
21
SAMA ISA Reference Accuracy"3 Accuracy Ratingl4 Conformity!23 Conformity, independent! 'l HysteresislH Hysterests"'I RepeatabilityNI Repeatability l "3 Test Cycle l 4 Calibration Cycle 0 23 Test Procedurest4 Test Procedures"21 Range" l Rangel "3 3.4 References / Standards
, ej Scientific Apparatus Makers Association Standard PMC 20.1 1973, " Process Measurement & Control Terminology", p 4,1973.
[2] Ibid, p 5.
[3] Ibid, p 19.
[4] Ibid, p 28.
[5] Ibid, p 36.
[6] Ibid, p 27.
[7] instrument Society of America Standard S67.04-1994, "Setpoints for Nuclear Safety-Related Instrumentation", p 18,1994.
[8] Instrument Society of America Standard S51.1-1979, " Process Instrumentation Termicology", p 6,1979.
l
[0] Ibid, p 8.
[10] Ibid, p 20.
[11] _lbid, p 27.
[12] Ibid, p 33.
l [13] Ibid, p 25.
- l. 22 l
l
TABLE 31 POWER RANGE, NEU1RON FLUX LOW & H10H l Parameter ADowance' Process Measurement Accuracy 5.u
( 1*"
(
r". !
l Primary Element Accuracy Sensor Calibration Accuracy I r" I Measurement & Test Equipment Accuracy I l'"
Sensor Pressure Elfccts Sensor Temperature Effects g pu Sensor Drift I r" Environmental Allow 1tnce Blas l
- Rack Calibration Rack Accuracy Measurement & Test Equipment Accuracy Comparator Rt.ck Temperature Effect Rack Drift L .
Tag No.) N41, N42 N43, N44
- In percent span (120% RTT')
Channel Statistical Allowance =
r ,*"
.L J
23
.__.________.__._._.m._ . . _ . . _ _ _ _ . _- . _ _ . _ . _ . . _ . . _ _ _ _
r i
i TABLE 3 2 l POWER RANOE. NEUTRON FLUX . H10H N.I LOOP OPERATION 4
j Parameter Allowance' i
. .u Process Measurement Accuracy j [ l'"
- j.o i
, Primary Element Accuracy Sensor Calibration Accuracy I .]'"
j - Measurement & Test Equigent Accuracy l
a
.I l'"
4'
- Tensor Pressure Effects i
f Sensor Temperature Effects
! [ l'"
j Sensor Drift g j.o Erwironmental Allowance Blas Rack Calibration-Rack Accuracy
- Measurement & Test Equipment Accuracy Comparator Rack Temperature Effect Rack Drift L -
Tag No.) N41, N47, N43, N44
- In percent span (120% R1T')
- Channel Statistical Allowance =
r 7'"
3 24
TAllt.E 3 3 M)WER RANOE. NEUTRON FLUX lilOH M)SITIVE AND NEOATIVE R A*IE l
Parameter Allowance
- l
. .a 7
Process Measurement Accuracy
(
).u Primary Element Accuracy l Ser sor Calibration Accu'7y I
j.o l bicasurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects '
I j.o Sensor Drift I
j.o Environmental Allowance Ilias Rack Calibration Rack Accuracy Measureinent & Test Equipment Accuracy Comparator Rack Temperature Effect Rack Drift
. J Tag No.) N41, N42, N43, N44
!
- In percent span (120% RTP) l Channel Statistical Allowance =
l r 1'"
l I
L j 25
- v' TABLE 3 4 INTERMEDIATE hANGE NEUTRON FLUX Parameter -Allowance
- Prtress Measurement Accuracy r 7'"
I j.u Primary Element Accuracy Sensor Calibration Accuracy
( )*"
Measurement & Test Equipment Accuracy Sennor Pressure Effects Sensor Temperature Effects
[ j.u Sensor Drift
-[ j.u Environmental Allowance Blas Rack Calibration
_ Ract Accracy-Measurement & Test Equipment Accuracy Comparator Rack Temperature Effect Rack Drift w .
Tag No.h . N35, N36
_ .* In percent span (120% RTP)
Channel Statistical Allowance =
e
, .4.0 J
26
TAllLE 3 5 SOURCE RANGE NEUTRON FLUX Parameter Allowanee*
Process hicasurement Accuracy I '
[
j.u Primary Ele sent Accuracy Sensor Calibration Accuracy
, I ju hicasurement & Test Eauipment Accuracy Sensor Pressure Effects Sensor Temperature Effects
[ j.u Sensor Drift
[ j.u Environmental Allowance Dias e
Rack talibration Rack Accinacy hicasurement & lest Equipment /.ccuracy a
Comparator y_ ,
Rack Temperature Effect Rack Drift L J 1ag No.) d31 N32
- In percent span (10' cps)
Channel Statistical Allowance =
r .o 1
J 27
4 TABLE 3 6 OVERTEMPERA1URE AT (CORE BURNDOWN EFFECTS) (N LOOP)
(Rosemount Model ll540P9 Transmitter for Pressurizer Pressure)
Assumes re normalleatlas of AT , T". and T' Parameter Allowance *
. . *u Process Measurement Accuracy _
i y'*
r" r
t l
g- pu I T"
! I r" t
[- r"
( r" l [ r" Primary Element Accuracy Sensor Calibration Acetuacy I r
g pu Sensor Reference Accuracy -
g pu Measurement & Test Equipment Accuracy g yu Sensor Pressure Effects Sensor Temperatuie Effects g pu Sensor Drift g pu
( r" Environmental Allowance
[_ p..
g yu Rack Calibration Accuracy
.g pu g.- pu
! 1" '
I r" I r"
- I. r"
. J 28
TAllLE 3-6 (contiaued)
OVERTEMPERATURE AT (CORE BURNDOWN EFFECTS) (N L N)P)
(Rosemount Model ll540P9 Transmitter for Pressurizer Pressures Assumes re normalltation of AT,, T", and T' Parameter Allowance
- Measurement & Test Equipment Accuracy 3.u l
[ ).u
- j.u g j.o
( ).u
( ).u 1
Comparator l
(included in string calibration) l l
Rack Temperature Effect l
l Rack Drift l
[ )** l
[ l'"
g j.u I l'"
L .
Tag Numbers TE411 A, TE411B, I'T455. N41 TE421 A TE421B, I'T456, N42
- In percent AT span (AT 903'F; Tavg .100'F; Pressure 800 pst; Power - 150% RTT*, Al 160% 41; 903'F span = 150% power)
Clwmel Statistical Allowance =
r l'"
l I
1 L l J
f 29
TABLI: 3 7 OVERPOWT't AT (CORE BURNDOWN EFFECTS)(N LOOP)
Amunes re mormallration of AT.. T", and T' Paranneter Allowance *
. . .o j Process Measurenwnt Accuracy g yu I
g r" 1 pu
_g pu I
g pu r"
! Primary Element Accuracy
)
Sensor Calibration Accuracy
[ l'"
t i Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperatute Effects Sensor Drift
( r" Environmental Allowance g p.,
Rack g Calibration Accuracy _ _ pu I r" g pu g pu Measurement & Test Equipment Accuracy
[ pu
! r" g yu Comparator (included in string calibration)
- Rack Temperature Effect Rack Drift I r" l r" L -
Tag Numbers 1E411 A,1TAllB, TE431 A, TE43tB. TE421 A, TE421B, TE441 A, TE441B
- In pexent AT span (AT . 90.3'F Tavg 100*F; Power .150% RTP; 903'F span = 150% power) 30
TAllLE 3 7 (continued)
OVERM)WER AT (CORE BURNDOWN EITECTS)(N LOOP)
Auumes re normallration of AT.. T", and T' Channel Statistical Allowance =
r , .r.
l l
l l
I l
(
31
TABLE 3 8 OVERTEMPERATURE AT (CORE BURNDOWN EITECTS)(N 1 L(X)P)
(Rotemeunt Model ll540P9 Tranunitter for Pressurizer Pressure)
Amumes re normalls.ation of 4T. T*. and T' Parameter Allowance
- 3.a Process Measurement Accuracy
[ j.u
_g j.u I l'"
I g l'".u 3
[. ]'"
1- l'"
g 3.u Primary Element Accuracy Sensor Calibration Accuracy I l'"
I l'"
l Sensor Reference Accuracy
[ ).u Measurement & Test Equipment Accuracy
[ ).u Sensor Pressure Effects Sensor Temperature Effects -
t l'"
Sensor Drift g j.u I l'"
Environmental Allowance I
g l'" j.o Pwk Calibration Accuracy g 3.u
! l'"
i P' g j.o g j.u
).o 32
.>_.._-.....m_-_.___._.._m__ - - . . . _ _ _ _ _ - -
TABl.E 3 8 (continued)
OVEREMPT INIURE AT (CORE BURNT'OWN EFFECTS) (N 1 LOOP)
(Rosetnount Model ll!40P9 Transmii.cr for Pressurizer Pressure)
Assumes re normalisatka of AT., T". sad T' b
Parmeneter Allowance *
. . .u Measwement & Test Equipment Accuracy g j.o
_g j.o I 1*"
g j.o g j.o Comparator--
(included in string calibration)
Rack Temperature Effect Rack I' rift
[ ]*
g jo I '
l*
g ).u
. J Tag Numbers W411A W411B.M455 N41 TE421 A, E421B, M456, N42 In percent span (AT 87.0'F; Tavg 100'F; Pressure 800 psi:
Power 150% RTP, Al *60% Al; 87.0*F span = 150% power)
Channel Statistical Allowance =
7 . .a 1
J 33
,_ _ ~ . . ~ . . _ _ _ _ -.-.. 2. _ _ _ _ - _ - _ . - - _ . - _ _ - - - - - - . - - - - . . - -
TABLE 3 9 OVERPOWER AT (CORE BURNDOWN EFFECTS) (N 1 LIX)P)
Amunes re normalization of AT , T", and T' P
Parasseter Allowance
- Process Measwement Accuracy r 1 *"
I l'"
g j.o g pu I r" I r" L ( r" Primuy Element Accuracy
- Sensor Calibration Accuracy-
- g. pu Measwoment & Test Equipment Accuracy Sensor Presswe Effects Sensor Temperatwe Effects
. Sensor Drift I r" Environmental Allowance. -
I d'"
Rack Calibration Accuracy ,
I
.g.
r" yu
[ pu I r" Meassement & Test Equipment Accuracy I r" g yu I r"
~ Comparator ' ,
- Oncluded in string calibration)
Rack Temperature Effect Rack Drift
[. pu I~ r" L J Tag Numbers . TE411 A, TE411B. TE431 A, TE431B, TE421 A.1E421B, TE441 A.1E441B -
- In percent AT span (AT 87.0'F; Tavg .100'F: Power .150% RTP; 87,0'F span = 150% power) 34 g
- I
TABLE 3 9 (continued)
OVERPOWTR AT(Core Burndown Effects)(N 1 LOOP)
Assumes re normalization of AT.. T", and T' Channel Statistical Allowance =
T ,~
1 l
l l
' J 35
- .~ - - . . . - - _- - . - . . - - . . . - . . . -
T k
TABLE 310 PRESfiURIZER PRESSURE . LOW & HlOH !
- (ROSEMOUNT 11540P91RANSMITTER)
Parameter Allowance *-
pu Process Measurement Accuracy '
Primary Element Accuracy Sensor Calibration Accuracy Sensor Reference Accuracy Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects Sensor Drift (30 months)
Environmental Allowance Bias g_ yu Rack Calibration Rack Accuracy-Measurement & Test Eqeipment Accuracy
- Comparator String Calibrated Rack Temperature Effect Rack Drift Tag No,k . YT457, PT458
' In percent span (800 psia)
Channel Statistical Allowance =
r' q +u L- 3 t
36
-_ _ _ - - _ . ~ _ . _ ._ . . . _ . , _ - . _ _ _ _ _ _ _ . . _ _ _ _ - _ . . ._ . . _ . . .
Y TABLE 311 PRESSURIZER PRESSURE - Si (ROSEMOUNT ll540P9 TRANSMITTER).
Parameter Allowance
- 7 5.a Process Measurement Accuracy -
.l l
- Primary Element Accuracy-Sensor Calforation Accuracy
] Sensor Reference Accuxy
- Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects
- Included in EA tenn Sensor Drift (30 months)
' Environmental Allowance -
[ j.u g j.u
[ l'"
l i Blas
[ ).u 1
- - Rack Calibration
' Rack Accuracy Measurement & Test Equipment Accuracy
+
Comparator String Calibrated-Rack Temperature Effect Rack' Drift -
l l L J Tag No.) - FT457. Fr458 l
- In percent span (800 psia)
, Channel Statistical Allowance =
r 7 '"
t l
l L I 1~ 3 l 37
TABLE 3-12 PRESSURIZER WATER LEVEL HIGH (VERITRAK 76DPl TRANSMTITER)
Paramieter Allowance *
, . .u Process Measurement Accuracy
[. j.u
( ]*"
Primary Element Accuracy-
. Sensor Calibration Accuracy Sensor Reference Accuracy Measurement & Test Equip.nent Accuracy
- Sensor Pressure Effects I
Sensor Temperature Effects Sensor Drift (30 months)
' Environmental Allowance Bias
.[ ]*"
g j.u Rack Calibration Rack Accuracy Measurement & Test Equipment Accuracy -
Comparator String Calibrated Rack Temperature Effect Rack Drift l L J
_ Tag NoA - LT-459-
- In percent span (100%)
Channel Statistical Allowance =
r- ,*
- I I
i l
1 L J i
38 N
l
~ TAdLE 313 PRESSURIZER WATER LEVEL . HIGH (ROSEMOUNT I153HD5 TRANSMITTER)
Parmemeter Allowance
- 3.u Process Measurement Accuracy-
[ j.o
(- j.o Primary Element Accuracy Sensor Calibration Accuracy Sensor Reference Accuracy Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects Sensor Drift (30 months)
Environmental Allowance Blas
[ j.o
.g j.o Rack Calibration Rack Accuracy Measurement & Test Equipment Accuracy Comparator String Calibrated Rack Temperature Effect '
Rack Drift' L J Tag Nol- LT-460, LT-461
- In percent span (100%)
Channel Statistical Allowance =
r 7'"
'I I
L I J
39
. . . . . - - . . . - - . - - . - . - . - ~ . - . - . . . - - . _ - . - . . - . . - . - - . - - . _ _ = .
TABLE 314 -
4 S1EAM GENERATOR WATER LEVEL - LOW LOW (FLB)
(ROSEMOUNT I154DH4 TRANSMITIER) . *
- Parameter Allowance
- T
- Process Measurement Accuracy l I l g- l'" j.o
- g j.o i l'"
. Primary Element Accuracy -
- -Sensor Calibration Accuracy
, Sensor Reference Accuracy l
~
l Measurement & Test Equipment Accuracy Sensor Pressure Effects -
Sensor Temperrture Effects included in EA term
~ Sensor Drift (30 months) 1 ' Environmental Allowance j.u g-
{- [ ]*"
j.u g- j ,
Blas
- I l'"
l
. R .ck Calibration Rack Accuracy
- Measurement & Test Equipment Accuracy
.' -IComparator String CaliNated Rack Temperature Effect 1
1- ' Rack Drift l l L J k
Tag No.i- LT517, LT518, LT519 LT527,LT528,LT529 LT537,LT538,LT539 LT547, LT548, LT549
'LT551 LT552,LT553 j LT554 F
- In percent span (100%)
i 40 1, .
TABLE 314 (continued)
STEAM OENERATOR WATER LEVEL LOW LOW (FLB)
(ROSEMOUNT ll54DH4 TRANSMITIER)
Gannel Statistical Allowance r y *u I
I I
I I
I
]
41
TABLE 315 STEAM GENERATOR WA1ER LEVEL - LOW. LOW (LONF)
(ROSEMOUNT 1154DH41RANSMITIER)
Parameter Allowance
- r Process Measurement Accuracy
[. ]*"
[ ]**
-[ ]**
g j.o Primary Element Accuracy
- Sensor Calibration Accuracy Sensor Reference Accuracy Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects Sensor Drift (30 months)
Erwironmental Allowance Blas
[ ' ]+"
Rack Calibration Rack Accuracy --
' Measurement & Test Equipment Accuracy Comparator String Calibrated Rack Temperature Effect Rack Drift L J Tag No.)- LT517 LT518 LT519 LT527, LT528, LT529 LT537, LT538, LT539 LT547, LT548, LT549 LT551,LT552,LT553 LT554
' In percent span (100%)
42 1
TABLE 315 (continued)
STEAM GENERATOR WATER LEVEL LOW-LOW (LONF)
(ROSEMOUNT ll54DH4 TRANSMITTER)
Channel Statistical Allowance =
r t
J l
1 43
TABLE 316_-
STEAM OENERATOR WA*IER LEVEL HIGH H10H-(ROSEMOUNT ll54DH4 TRANSMITIER)
Parasteter Allowance
- 3+u
- Process Measurement Accuracy I
g l'".o j
g j.o
[ ).u Primary Element Accuracy -
Sensor Calibration Accuracy Sensor Reference Accuracy
-Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects Sensor Drift (30 months)
Environmental Allowance Bias g j+u
_ Rack Calibration
- Rack Accuracy Measurement & Test Equipment Accuracy l Comparator String Calibrated Rack Temperature Effect Rack Drift L J Tag No,i - LT517. LT518 LT519 LT527, LT528, LT529 LT537, LT538, LT539 LT547, LT548, LT549 LT551,LT552,LT553 LT554
- In percent span (100%)
1 44
TABLE 316 (continued)
STEAM GENERATOR WAlliR LEVEL HIGH HIGH (ROSEMOUNT ll54DH4 TRANSh'ITTER)
Channel Statistical Allowance =
r , +u I
I I
I I I I
I I
' I J
45
- ... - . - - . - . . . - . - . - . - - . - - - ~ . - . . - . . .
i i
TABLE 317 REACTOR COOLANT PUMP UNDERSPEED Parasmeter Allowance *
~
r 1*
Process Measurement Accuracy {
< Primary Element Accuracy
, Sensor Calibration Accuracy 1 Sensor Reference Accuracy i
,i - Measurement & Test Eqalpment Accuracy Sensor Pressure Effects
. Sensor Temperature Effects Sensor D-ift (30 months) -
l Environmental Allowance Bias
, Rack Calibration Rack Accuracy Measurement & Test Equipment Accuracy
- Comparator l
String Calibr. ed 1 . Rack Temperature Effect i Rack Drift i
4 L J
- Tag No.) - SE495, SE496, SE497, SE498
- In percent span (81.013 - 106.329% RNS)
- Channel Statistical Allowance =
- r. j*
1 4
46
< , - - , , . . e e - - - - . ,-- - -
TABLE 318 CONTAINMENT PRESSURE . HIGH 1. HJOH 2 HIGH 3 (ROSEMOUNT ll53AB6 TRANSMITiliR)
Paranneter Allowance' 3 +u
- Process Measurement Accuracy ~
Primary Element Accuracy Sensor Calibration Accuracy Sensor Reference Accuracy Measurement & Test Equipment Accuracy Sensor Pressure Effects Sensor Temperature Effects Sensor Drift (30 months)
Environmental Allowance Blas
(. ]** l Rack Calibration Rack Accuracy Measurement & Test Equipment Accuracy Comparator.
' String Calibrated Rack Temperature Effect Rack Drift L J
' Tag No.h - m34, m35, m36, m37 -
- In percent span (60 psia).
- Channel Statistical Allow ~ance =
r 3*"
L J
47
_ _ _ _ _ _ , _._ _ .. __._.._.__._.._-.-___._m _ _ _-._. .__ __. . _ . -
4 4
1 L
TABLE 319 STEAMLINE PRESSURE - LOW S1 (ROSEMOUNT_ l1530B9 TRANSMITTER).
- Parasmeter Allowance
- i-q +u Process Measurement Accuracy a
Primary Element Accuracy Sensor Calibration Accuracy Sensor Reference Accuracy i
Measurement & Test Equipment Accuracy t
Sensor Pressure Effects '
f i _ Sensor Temperature Effects j Sensor Drift (30 months) j.
Environmental Allowance
. [- J'"
i 7 Blas l l [ l'"
-[ l'"
1 4: Rack Calibration
- - Rack Accuracy Measurement & Test Equipment Accuracy Comparator
- _ = String Calibrated _
- Rack Temperature Effect i
2- Rack Drift l 1- . J
. Tag No.h - FT514, FTS15, M516 PT524, PT525, Fr526
- PT534, PT535, PT536 I"T544, PT545 PT546
.
- In percent span (1300 psig)
Channel Statistical Allowcace =
r 7 '"
l 1 L J 4
48
- , - - ,e-. - . _ . . -.,-.,.4 ., .,-- y
1-d 5
TABLE 3 20 NEGATIVE STEAM PRESSURE RATE HIGH 4
Paratmeter Allowance
- r 3*
l - Process Measurement Accuracy
- Primary Element Accuracy
Sensor Calibration Accuracy
(-
4
_l
- 1. ]* I I
- Measurement & Test Equipment Accuracy
, l j : Sensor Pressure Effects
- Sensor Temperature Effects
[.
-jw Sensor Drift
'[
jw
' Environmental Allow 1mce Rack Calibrati<m Rack Accuracy -
. Measumment & Test Equipment Accuracy Comparator Rack Temperatme Effect Rack Drift I !
L J Tag No.) - FT514, PT515. PTS 16 FTS24, PT525, PT526 FT534, FT535, I"T536 -
PT544, PT545, PT546
- In percent span (1300 PSIG) -
Channel Statistical Allowance =
L I 3
49
A 5
i TABLE 3 21 -
RCS LOW FLOW (N LOOP) (ROSEMOUNT I153HD5 TRANSMITER)
Parameter Allowance
- r l'"
. Process Measurement Accuracy .
[. j.u
- [. ]*"
4 Primary Element Accuracy
.[ ]'"
- Sensor Calibration Accuracy i
[ . .
]+"
Sensor Reference Accuracy [ l'"
4 Measurement & Test Equipment Accuracy l
.(. j a
i- ' Sensor Pressure Effects
[- ]+"
l
. Sensor Temperatus Effects
[ .u
)
f Sensor Drift (30 months)[ ]'" l Erwironmental Allowance Blas [ ]**
i.
Rack Calibration 4 . Rack Accuracy [ ]'" '
1 Measurement & Test Equipment Accuracy [ ]'" l l
i( Comparator l 1- String Calibrated i
' Rack Tempe:ature Effect [ -]
Rack Drift [ ]'"
j -
.J
- Tag No.) - FT414, FT4i5, FT416, FT424, F' 25, FT426
- FT434 FT435, FT436, FT444, FT445, FT446
- In percent span (120% flow)-
! Channel Statistical Allowance =
i r- 7*"
i L l l
1 l
l L j N
4 50 1
.. . -~ ~ . ~ . . .- . . _ . - - - . . . ~ _ . . -
4-TABLE 3 22
- RCS LOW FLOW (N 1 LOOP) (ROSEMOUNT ll53HD5 TRANSMITIER)
Parameter Allowance * '
r 1 *"
Process Measurement Accuracy
[. ]*"
4 [ )*"
Primary Element Accuracy
[-- )*" i 4
--Sensor Calibration Accuracy
[- )*" l
- Sensor Referu.ce Accuracy [ ]*"
Measurement & Test Equipment Accuracy {
[ ]*" .
Sensor Pressure Effects i [ )*"
4 Sensor Temperature Effects j- -[ ]*"
]*"
d Sensor Drift (30 months)[
i ,
Environmental Allowance Bias [ )+u
$ Rack Calibration i Rack Accuracy [ ]+u Measurement & Test Equipment Accuracy [ ]*" -
Comparator String Calibrated '
4
- Rack Temperature Effect [ l'" f l I I Rack Drift [ ]*" . l l L J' i~
Tag No.) FT414, FT415. FT416, FT424 FT425, FT426 FT434, FT435, FT436, FT444, FT445, FT446
+
- 'In percent span (120% flow) .
Channel Statistical Allowance =
r1 7 '"
L J 51
.. ... = . -. - - - - - - . . - . - - . ~ . . .
. ~~ , . . ~ . - - - - . - . . - . . . . . . . . . -
1 2
, TABLE 3 23 -
TAVO, LOW AND L.OW LOW Parameter Allowance * '
r 7 "" - '
Process Measurement Accuracy (hot leg streaming)(pmalh)..
u . Beta (hot leg streaming stability introduced on the loss
- of a hot leg RTD)
Primary' Element Accuracy 1
Sensor Calibratica Accuracy (scartd)
} . Sensor Reference Accuracy (srartd) .
I Measurement & Test Equipment Accuracy (smte) l -
! Sensor Pressure Eftects -
i i Sensor Temperature Effects '
j- Sensor Drift (30 months) (sdrtd)
Environmental' Allowwce i
.Blas I l*
, Rack Calibration Accuracy l
- Tavg (tcal) >
[ R/E - (recal) l -
l l= - Alpha (accuracy of hot leg streaming bias on the loss '
- i. . of a hot leg RTD)
. Measurement & Test Equipment Accuracy Tavg (tmte) l R/E (remte)
Comparator.
P String Calibrated Rack Temperature Effect (trte)
Rack Drift (trd) l L .
Tag No.) 1E411, TE421. TE431 TE441 1
d 52
'. n.. - - - --- w N ,, . . . , . . -- ,..n . . , . . ~ . , , . , -------~wm,,.--,.n,. -- -
TAllLE 3 23 (continued!
TAVO, LOW AND LOW-LOW snd = (smtend + sdnd)2 + (scand + smtend)2 + stand' = 0,9 re = (remte + rerd)2 + (recal + remte)2 = 0.2 track = (tmte + trd)2 + tite' + (tcal + tmte)2 + alpha2 = 1.2 Channel Sististical Allowanct =
r ,-
I I
I I
)
53
..,s EsT*Guan>MowTARv class :
1 REACTOR PROTECTION SYS ACTUATION LYSTEM (
WILU SENSOR
~~
1 2 3 4 l 4 T EA$lJDE.NT PROCE18 MasARY a 1EST PROTECTKN O4ANPEL EASL7EdIO ELIENT CALBRA 1CW 'EFUENCE EQUFEWT MESS @E RW'ERATIJE ACCLAtCY A(XUuCV ACCLJuCY ACX2EMCY !.X13MCY EMECTS EFTECTS '
- 41) (1) W (1) W (1) 0) 1 POWER RAPGE. EUflOf FLLDI . MGH $ETPONT i POWER fuNGE EUT101 FLUK . LOW SETPOWT 8 POER RANGE, ifUTRON FLUK . St3M SETPCWT $ t LOOP) 4 W RANCE. EUTRCN FLUX . HKiH PC6mVE a PEGATfvE RATE S NTEMEVtATE RANGE, EUTRON FWK 4 SOURCE RAN(E, EUTRCN FWK T OER4nesuTufE AT af CHANPQ MLOOP)
TAVG CHAMG PEsalRCER PPE53L5tE CNANPQ Ra4 CHANPG
$ CE3FCNER AT ATCHAM G MLC@)
TesCHAM G 9 OWRTEW'ERATWlE AT t.
Mt LOCP) 10 OWFF0MER AT Mt LOOP)
- ti MEESLFER MES$lAE . LDN. EACTCR 1hF $0SEWOLNT 15eGPS XWrrfEM 12 PRESSLRCER PES $URE . HGL EAC10R TRF FIDEGOLNT 115eGP9 RMTTEM 13 PE53tRCER WATER LDEL . HIGH (VERffRAf(140P1 EMTTEM 14 PES $tRCER WATER LDEL - MQH pt06DONT 111305 KWTTIM 15 LOSS CF FLOW M A (OSGOUNT t1D05 XWT1ER to LOSS CF FLOW M1 LOCP) 7406EWOLNT t1G06 XMTIER) 17 $ TEAM GEE.1AKR WATER LEVEL. Lot
- LOW In FL3 POSEWOLNT I15eDHe XMTTER) l 14 STEAW GEETIA10R WARR LEVEL LonLOW tar LOE panrsin wT i154DHe KMTTER) 19 EACM COOLANT Pur L90ERSPGD 3 PtE3Sl54CER PFESSLJE LOW . $1 F0EGOLWT 115eGPS XMTTER) 21 STEAAtJE ME$$tJE . LOW lROGEWOLNT 1153GBs 1MTTEM 3 CONTAMENT MES$JE MGH 1 906G0LNT tts3 Ass XMTTEM D OCNTAhedENT PES $GE HIGH 2 540SEAOLNT tts3A86 IWTTE14)
M CXNTAMENT PE15t#E HGt 1 finrsin wT ttsnAga ggt 1Eq 5 IEGATWE $4AW MESSUFE RATE . HQH a sTuW EERAite WAuR IfyE . HGus2H FOSEWOUNT ttsou 1MTEM e Tava ton a towLOW NOTES t A61 VALLES W POICENT CF SPAft t as N0fto n Taste a64 CF M r s t[ r 17. [
1 AS NOTED M TABLIS ut Mc p4 W M PUNT TEOf4 CAL SPECFCATDE at r ai
- 11. [ r It (
- I F tt I r a(
a NOT usto a suffy ANe vsa, a as Notto a runs nai a nata ce M PsAR n( r T As NCmn m TAsLI u1, NCHES 140 2 CF M PUNT RCmCAL $PECFUTpa 14 g r it i t As NOTED M TAGLI ut, NOE3 4 40 4 CF M PUNT HCmICAL SPECFUTD6 11 [ r E[
E NOWE i EXCCAE Ra4 CCaFARSCW A$ MMO k TABLE 41 CF DE PUNT EQf4 CAL
$PECFICATICNL i
0 h
I 1
.w __
~
d 3-24 g((
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~
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DI M M M M 4) (1) p) p) 3R RlP 5% RTP s218% RTP L3 3 r .,P ...,P m. ,, ,
I m s n R1P sin . -
4
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m tDs) es) RmCtioN m (4 to l . . 2,.,. m o ,,
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E REACTOR PROTECTION SYS ACTUATION SYSTEM C MllM l SENSOR 1 2 3 4 6 4 7 nEA$WEnENT PROCESS PRSAARY & TEST PROTECTKm OWeG MEASJEnENT ELEnEMT OALSRATDs EFUEM2 EGKENT MEE$lfE TEleT8uTURE ACCLRACY ACCUMCY ACKXA4CY ACT.ARACY ACCIRAcY DTECT5 EFFECT5 I
_, 0) D) 0) M 0) M Ul t PJWER RAP 0E, EUT%N Rut . LOW SE150NT 3
POO RAMuf. EUTRCN FluK tos SETPONT M 1 LOC 81 4 80WER IUNGE, EVl10N PJ.!K . De34 POS'TNE 4 EGATNE RATE S NTUhEUlAR RAPGE. EUTRCm RuK 4 SCRJQ RANGE. EVitKm FLUK 7 OWEPTEhPOtATUFE &T af Q* EEL m )
TAVQCHAP9G PRESSJtER PESSGIE QWeG II.na OW4G 4 OVEWOWER4T 47DWeG MLOOP)
T.,oWeG 9 OVERTDdPERATIJE AT M1 LOCP) to 04WouER AT k1 LOOP) 11 PESSUER PE5SLfqE u)uL REACTOR TRP 50GFh0LNT ItNPS XnATTER 13 PESStJtER PES $UFE . HDt flEACKR TRP ftXEh0LNT INGPSIHrTTEM 13 PE3$UER WATER LEVEL . HOI (WUllTRAd( TEOP1 XndfTTER 14 PE53Wt2ER WATER LINEL 604 ftCEEnOLNT 115506 indr'TER 15 LOSS OF Row ft LOOP) 506EnKANT 11005 KnalTER) 16 LCES OF RCte M1 LOCP) If 06En0LNT 11905 EurfTEM
.7 STEAns GEERAKft WATER LEVEL. LDt%CW tw PJ ft06Ent1NT 115CH4 XWITTEM 10
$1EAM ENERAICR WATER LINEL. Lovstow km LCet FC6Enf0UNT 115aOH4 KMff1EM 19 SIEACER CCCRANT MadP UFOOtSPGD 3 PHESSL5tER PRESSLEE LCW . Si $4C6EHOLNT 115 CPS KMITTER) tt sTEAnUE PESRf & LOW ftCEEnONT 115X18e KurTTEM a cCNTAsadENT MEis.M DEQH 1 FOGEWOLNT 1153A88 KWITTER)
D CCNTAS4ENT PRES $GE HKiH t PCEEnalNT 1153A88 XMITTEM as CCHTAseENT PRES $LJE MGH 3 ftCMnONT 11SIAda XMfTEM s EGATNE 51EAM PEssure RATE . Hot a STEAM GEERATCR WATER LivEL = HKWE1H 506EMC1MT 115CHs xurTTEM )
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- 7. at (
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i PME5s EE 3-24
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3% RIP 39% RTP s&fn R19 && 3 I
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4 m an R1P snm Rn -
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- 5) af% SPAN EK.M $ PAN =
L3
- 8) 8B% $ PAN sgLM $ PAN -
N 4EnD3GN 90% MSO4 2dLfg must 42 t$
ten DESDI 8D% DEseN ackn DE$iGN 42 18 9% SPAN Et% $ Pet 217 fn IPAN E1 17 10% LPAN Ett $ PAN at?JnSPAN Lt 18 9E% 80e5 SLA Wel adL2% Nel 1.7 18 12 8SIA 1002 PS4A tieILS PS4A SLS 30 e PSG GEtt PSG adEL7 PEG 1E4 21 E7 *EIA 17.7 PSIA st?$ PSIA 13 33 18.7 AllA 17.7 PSIA s17.9 PSIA 13 D SL7 85!A EL7 PSIA 51ELS PSIA 13 30 m 100 PSift sleLS PSWS -
5 10% 5 PAN BL$% $ PAN ERILin SPAN 11$ 35 g) SEP F i S5F F 30018 1 -
N
-. 35R14 T - -
ai F F F MI F F at F a 98511ATDs fESISTANCE DEGRADATRse.llE.ATED AS A Ba3 F El I r al r F #l F Mi F st i F El P 7 026oo ' - '
TABLE 3 25 OVER1T.MPERATURE AT CALCULATIONS (Rosemount Il54GP9 Transmitter for Pressurizer Pressure) e The equation for Overtemperature AT:
AT (1 + t@
ate (1
- Ts3) g g, , (1 + TA (T - M + 4 (P - P) -f, (AI) )
(1 + TrT)
K i (nominal) = 1.20 Technical Specificat ion value Ki (max) =[ r" K2 = 0.02456/'F K, = 0.001311/ psi Vessel AT = 60.2 'P (N Loop)
Vessel AT = 58.0 'F (N.I Loop)
Al gain = 1.98% RTP/% Al e Full power AT calculation:
AT span = [
r" AT span = [
r" e Process Measurement Accuracy Calculations:
g yu
! r"
[ r"=
{ r"
=*
Presumes normalization of AT, and T to as found full power indicated values.
56
TABLE 3 25 (continued)
OVERTEMPERATURE AT CALCULATIONS (Rosemount 1IS4GP9 Transmitter for Pressurizer Pressure)
Al Incore / Excore Mismatch r *u l
J Al Incore Map Delta-1 r 3
+u l
I I
I l
l L
af Pressure Channel Uncertainties r 7'"
Gain = l L I J
r 1"
- SCA = l SRA =
SMTE =
STE = 1 l
SD =
I
' J r >'"
RCA = l l
RMTE = l l
RD = l 1 l I L J 57
TABLE 3 25 (continued)
OVERTEMPERATURE AT CALCULATIONS (Rosemount il54GP9 Transmitter for Pressurizer Pressure)
- Al Channel Uncertainties r 7
Gain = l L I J
r 7
RCA = l l I l RMTE = l l l l RD = l l L J
- Total Allowance r 7*
I l
J Same result for N-1 Loop s
58
. TABLE 3 26 l OVERPOWER ATCALCULATIONS e The equation for Overpower AT:
AT (1 + 1 8) - tv3 Ar, (1 + 5A , g, ((1 + 5A) T - % [T - f1)
K (nominal) ~ = 1.09 Technical Specification value K. (max) = [ ]*"
K. - = 0.0 for decreasing average temperature -
K3 = 0.02 for increasing average temperature (sec/'F)
K. = 0.0018/'F Vessel AT = 60.2 'F - (N Loop)
-Vessel AT = $8.0 *F (N 1 Loop)
C e Full power AT calculation:
AT span = [ 1**
AT span = [
]*"
a Process Measurement Accuracy Calculations:
I l'"
( 3
.u
[ l'"
( l'"
Presumes normalization of AT, and T" to as found full power indicated values.
59
.. U
i TAULE 3-26 (Continued)
OVERPOWER AT CALCULATIONS a Total Allowance r y .u l
l l
I I
I I
I
' I J
Same results for N 1 Loop 60
i TABLE 3 27
& MEAF"REMENTS EXPRESSED IN FLOW UNITS 1hc & accuracy expressed as percent of span of the transmitter applies throughnut the measured span,i.e.,
11.5% of 100 inches AP = tl.$ inches anywhere in the span. Because F8 = f(&) the same cannot be said for flow accurneles. When it is more convenient to express the accuracy of a transmitter in flow terms, the following method is used:
(p,)s . p, where N = Nominal Flow i
2 F,8F, = $LP, a
thus #F* . Eq. 3 27.1
- 2 F, .
,~)' tor at a point (not in percent) is:
- h. **. .**. Eq.32n
- f. F. 2 (F,)' 2 &,
.and
- a .
(F,)'
Eq. 3 27.3
- . (F )'
- where max = maximum tiow end the transmitter AP error is:
8.u(100) . percent enor in Full Scale AP (% t FS AP) Eq. 3 27A 61
therefwe:
y"' % e FS &P ,
$ , 100 ,, % 4 FS AP F.,,
F, 3,27,5 p* , (2)(100) , F' 2AP,,,
F,,, ,
I~ Enor in flow units is:
% v FS AP F.,.
--#F, = Fn
. (2)(100), F, , Eq. 3 27,6 Enor in percent nominal flow is:
8F, % e ps Ap F,,,
-F,(100) "
2 , F, Eq. 3 27.7 Enor in percent full span is:
% e Fs y F""
b(100)
F,,,
(100)
F,,,, , (2)(100), F, ,
% e Fs Ap F,,, . Eq. 3+27.8 2 , F, ,
Equation 3-27,8 is used to express enors in percent full span in this document.
62 a
.._. -- - . =, _.
This page intentionally left binnk 4
63
4.0 APPLICATION OF THE SETPOINT METHODOLOGY 4.1 Uncertainty Calculation Hasic Assumptions / Premises The equations noted in Sections 2 and 3 have several basic premises which were determined by a systematic review of the calibration and drift determination procedures utilized at Millstone Unit 3 and statistical evaluations of "as left" and "as found" data for the -
, RPS/ESFAS functions noted in Tables 31 through 3 24 of this document:
l
- 1) the instrument technicians make reasonable attempts to achieve the Nominal Trip Setpoint as an "as left" condition at the start of each process rack's surveillance interval,
- 2) the instrument technicians make reasonable attempts to achieve a nominal "as left" condition at the start of each sensor / transmitter's surveillance interval,
- 3) the process rack drift is evaluated (probability distribution function chvacteristics and drift magnitude) over multiple surveillance intervals,
- 4) the sensor / transmitter drift is trended over the fuel cycle and evaluated (probability distribution function characteristics and drift magnitude) over multiple fuel cycles,
- 5) the procc>s rack calibration accuracy is evaluated (probability distribution function characteristics and calibration magnitude) over multiple surveillance intervals, t
- 6) the sensor / transmitter calibration accuracy is evaluated (probability distribution I function characteristics and calibration magnitude) over multiple surveillance intervals, 64
- 7) the process racks (with the exception of the bistables) are calibrated using a one up (or one down) pass utilizing multiple calibration points (minimum 4 points and for many functions - 5 points, as recommended by ISA51,ll ").
- 8) the sensor / transmitters are calibrated using a one up (or one down) pass utilizing multiple calibration points (minimum 4 points and for many functions - 5 points, as recommended by ISASI.lm)
It should be t ;cd for (1) and (2) that it is not necessary for the instrument tectuacian to recalibrate a l
device or channel if the "as left" condition is not exactly at the nominal condition but is within the plus or minus of nominal "as left" pmcedural tolerance. As noted above, the uncertainty calculations l assume that the "as left" tolerance (conservative and non-conservative direction) is satisfied on a reasonable, statistical basis, not that the nominal condition is satisfied exactly. Westinghouse has statistically evaluated the "as left" condition for the RPS/ESFAS process rack channels and sensor / transmitters for Millstone Unit 3 over multiple calibration cycles. This evaluation detennined that the SCA and RCA parameter values noted in Tables 31 through 3 24 were satisfied on at least a 95% probability / 95% confidence level basis. For those instances where non conservative biases in calibration were noted, the biases were factored into the uncertainty calculations. Calibration biases for sensor / transmitters were considered as non-conservative since sensor / transmitter signals are used for both control and protection and could be concidered significant for control purposes, it is therefore necessary for the plant to periodically reverify the continued validity of these results. This prevents the institution of nonconservative biases due to a procedural basis without the plant staffs knowledge and appropriate treatment.
In summary, a sensor / transmitter or a process rack channel is considered to be " calibrated" when the two-sided "as left" calibratic.n procedural tolerance is satisfied. An instrument technician may detennine to recalibrate if near .Se extremes of the "as left" procedural tolerance, but it is not required.
2ecalibration is explicitly required any time the "as found" condition of .he device or channel is outside of the "as left" procedural tolerance. A device or channel may not be left outside the "as left" 65
tolerance without declaring the channel " inoperable" and appropriate action taken, nus an "as left" tolerance may be considered as an outer limit for the purposes of calibration and instrument uncertainty calculations As part of this effort, drift data ("as found" "as left") for the sensor / transmitters and the process
,; o o evaluated. Multiple surveillance intervals were evaluated to detennine the appropriate vame . Er /r.ft for a surveillance interval of 30 months (for sensor / transmitters) and 3 months (for analog pnwess rack modules), his evaluation determined that the SD and RD parameter values noted in Tables 31 through 3 24 were satisfied on a 95% probability / 95% confidence level basis for the projected surveillance intervals. Generic Letter 9104m requires that ddft be tracked or trended on a periodic t asis. %e equations used in Sections 2 and 3, assume that drift data is evaluated for continuation of the validity of the basic characteristics detennined by the Westinghouse evaluation.
His assumption has a significant beneficial effect on the basic uncenalnty equations t'tilized, i.e., it results in a reduction in the CS A magnitude.
4.2 Sensorfiransmitter Operability Iktermination Program and Criteria As a result of the review of the plant procedures, the equations noted in Sections 2 and 3 are significantly different from those used in previous Westinghouse uncertainty calculations. One aspect of the equations casily noted is the significance of the calibration process,i.e., it is treated as statistically independent of the drift detennination. Another aspect is that if drift and calibration are independent processes, then the determination of equipment operability is changed, i.e., it is not the arithmeti; sum of the two uncenainties. Millstone Unit 3 and Westinghouse have agreed upon a set of criteria that may be used for equipment operability detennination which are controlled by plant procedures and processes, as opposed to the plant Technical Specifications. De principle criterion for sensor / transmitter operability, as a fiist pass parameter, is drift ("as found" "as left") detennined to be within Sb where SD is the 95/95 drift value determined for that specific device, e.g., a Pressurizer Pressure transmitter. This would require the instrument technician to record both the "as left" and "as G5
found" conditions and perform a calculation in the field. This field calculatiors has been determined to be impracticable at this time since it would require having the "as left" value for that device at the tirne of drift detennination and becomes a records availability / control problem. An altemative is the use of a fixed magnitude, two-sided "as found" tolerance about the nominal value. It was agreed that a reasonable value for this tolerance is Sh1TE + SD, wnere SD is again the 95NS drift value and Sh1TE is as defined in the uncertainty calculations and identified in the hilhstone Unit 3 procedures reviewed by Westinghouse. The value of this sum is explicitly noted for each RPS/ESFAS function in Table 41 of this document. This criterion can then be incorporated into plant function specific calibration and drin procedures as the defined "as found" tolerance about the desired, nominal value.
l j
A second criterion is the ability to calibrate the sensor / transmitter witidn the two sided "as left" l
tolerance, if the device drift is found outside the ShiTE + SD (or "as found") criterion, the drift characteristics may be evaluated incorporating the previous experience for that specific device. The irsponse time characteristics may also be evaluated on a qualitative and if necessary, a quantitative basis. it has also been agreed by hiillstone Unit 3 and Westinghouse that mordtoring the sensor / transmitter response with the average of its peer devices, utilizing data available ordine, periodically over the entire cycle is an additional check on operability. This additional check provides a reasonable substitute for the use of a relative SD tenn (as recommended in the Westinghouse paper W
presented at the ISA/EPRI conference of June,1994 ). When an appropriate acceptance criterion is utilized,it then allows the use of Sh1TE + SD as a first pass operability criterion. The acceptance criterion agreed upon between hiillstone Unit 3 and Westinghouse is a relative deviation of 0.5 %
span from the beginning of cycle difference value. A relative shift of tids magnitude has been determined to be an appropriate indication of device drift warranting further investigation.
It is believed that the hiillstone Unit 3 systematic sensor / transmitter program of drift and calibration review is acceptable as a set of first pass criteria. hiore elaborate evaluation and more frequent ordine monitoring may be included, as necessary, if the drift is found to be excessive or the device is found difficult to calibrate. To provide additional confidence in the evaluation process, hiillstone Unit 3 has agreed to utilize a function indication match criterion at the beginrdng of each cycle to determine the 67
acceptability of the calibration process for the transmitter and that portion of the channel encompassed thmugh the indicator Based on the above, it is believed that the total program proposed for htillstone Unit 3 will provide a more comprehensive evaluation of operability than a simple detennination of an acceptable "as found",
4.3 Process Rack Operability Determination Program and Criteria A similar program to that descr'. bed for sensor / transmitters has been determined for the process racks.
Ilowever, since the surveillance interval for the process racks is significantly shorter ti an the sensor / transmitter (3 months vs 30 months) and the process racks are accessible at power, the program does not have to be as comprehensive. The parameter of most interest as a first pass operability
! cnterion is drift ("as found" "as left") fc,and to be within RD where RD is the 95/95 drift value i detennined for that charmel. Ilowever, this has the same difficulties as the drift detem'ination for a sensor / transmitter, i.e., records of the "as left" condition must be available for field use in a calculation with the same records availability / control problems. A similar attemative may be used for the process racks as was agreed cpon for the sensor / transmitter, a fixed magnitude, two-sided "as found" tolerance about the nominal trip setpoint. Presuming similarity with the transmitter program, it would be reasonable for this "as found" tolerance to be Rh1TE + RD, where RD is the 95/95 drift value and Rh1TE is as defined in the uncertainty calculations and identified in the hiillstone Unit 3 procedures reviewed by Westinghouse. His value is explicidy noted for each RPS/ESFAS function in Table 41 as the Rack Operability column. Ilowever, comparison of this value with the "as left" tolerance utilized in the plant procedures and the Westinghouse uncertainty calculations will note diat diis "as found" tolerance is less than the "as left" tolerance. His is due to the fact that RD is a relative drift magnitude as opposed to an absolute drift inat,nitude and that the process racks are very stable, i.e., do not drift much. Thus it is not reasonable to use this criterion as an "as found" tolerance in an absolute sense as it conflicts with the second criterion for operability determination. Dat is, a channel could be left near zero, found outside the absolute drift criterion yet be inside the calibration criterion and not actually have exceeded the relative drift criterion. Therefore, a more reasonable approach for the plant staff was determined. The "as found" criterion based on absolute magnitude is the same as the 68
"as left" criterion, i.e., the allowed deviation from the Nominal Trip Setpoint on an atelute indication basis is plus or minus the "as left" tolerance. A process loop found inside the "as left" tolerance on an indicated basis is considered to be operable. A charmel found outside the "as left" tolerance is evaluated and recalibrated. If the channel can be retumed to within the "as left" tolerance, the channel is considered to be operable. %is criterion can then be incorporated into plant, function specific calibration and drift procedurcs as the defined "as found" tolerance about the Nominal Trip Setpoint.
At a later date, once the "as found" data is compiled, the relative drift ("es fourv!" "as left") can be calculated and compared against the Rack Operability column of Table 41. His comparison can dien be utilized to ensure consistency with the al.sumptions of the uncertainty calculations documented in Tables 31 through 3 24. Since the channel was left within the calibration tolerance, any determination that Table 41 criteria were exceeded would result in a conclusion that die affected hardware should be watched more closely. A channel found to exceed the criteria of Table 41 multiple times should trigger a more comprehensive evaluation of the operability of the channel.
The second criterion used for operability determination is the ability to calibrate the process rack channel widdn the two-sided "as left" tolcrance, if the channel relative drift is determined to be outside the RMTE + RD (or operability) criterion, the drift characteristics may be evaluated incorporating the previous experience for that specific channel. he response time characteristics for the channel (or individual process rack module) may also be evaluated on a qualitative and if necessary, a quantitative basis. Dere is not as much information to be gained by evaluating channel to average of peer channels utilizing control boani or process computer indication due to the difference in uncertainty significance, i.e., the uncertainty associated with a control teard indicator is significantly larger than the uncenalnty associated with a trip blstable. Derefore channel to charmel or average of channels comparison is not expected to provide significant indication of operability of the process racks in any way other than in a gross manner. Thus no recommendations have tren made in performing this process foi the racks. (It should be noted that this type of comparison is considemd beneficial for transmitters and is included for that purpose in Section 4.2 by Millstone Unit 3 and Westinghouse).
69
11 is believed that the Millstone Unit 3 systematic program of drift and calibration review proposed for the process racks is acceptable as a set of first pass criteria. More claterate evaluation and monitoring may be included, as necessary, if the drift is found to be excessive or the channel is found difficult to calibrate. Based on the above, it is believed that the total process rack program proposed for Millstone Unit 3 will provide a more cornprehensive evaluation of operability than a simple determination of an acceptable "as found".
4.4 Application to the Plant Technical Specifications l
i ne drift operability criteria noted for the process racks in Section 4.3 are based on a statistical evaluation of the perfonnance of the installed hardware. Bus the values can change if the Measurement and Test Equipment is changed. or the procedures used in the surveillance process are changed significantly and particularly if the process rack modules themselves are changed, e.g., from pure analog to a mixture of analog and ASIC (Application Specific Integrated Circuit) modules.
Derefore, the operability criteria are not expected to be static, in fact they are expected to change as the characteristics of the equipment change. his does not imply that the criteria can increase due to increasingly poor performance of the equipment over time. But rather just the opposite. As new and better equipment and processes are instituted the operability criteria magnitudes would be expected to decrease to reflect the increased capabilities of the replacement equipment. For example, if die plant purchased some fonn of equipment that allowed the determination of relative drift in the field, it would be expected that the Rack Operability column values of Table 41 would then be used as the "as found" acceptance criteria in the plant procedures.
Sections 4.2 and 4.3 are basically consistent with the recommendations of the Westinghouse paper presented at the June 1994, ISA/EPRI conference in Orlando Fim. Therefore, consiaent with this paper, Westinghouse recommends revision of Specification 2.2.1, " Limiting Safety Systern Settings -
Reactor Trip System Instmmentation Setpoints", Specification 3.3.2, " Engineered Safety Features Actuation System Instrumentation - Limiting Condition for Operation", Table 2.2-1 " Reactor Trip 70
System instnunentation Setpoints" and Table 3.3 4 " Engineered Safety Features Actuation System Instrumentation Trip Setpoints". Appendix A provides the Westinghouse recommendations for revision of these two specifications and tables. Tt'>le 3 24 (Column 16) and Table 4-1 of this l
document pmvide the recommended Nominal Trip Setpoint for each RPS/ESFAS protection function, which was utillzed in the Westinghouse uncettainty calculations and deter.sined to N acceptable for use. Table 41 also notes the Westinghouse recommended operability (dtda for ca h RPS/ESPAS protection function sensor / transmitter and process rack channel. These reconte:*.xla lons are specific to each input for multiple input functions and should be placed in the plant pro ( tduits and maintained under plant administrative control. This is consistent with the bases sections fc r the two specifications
- provided in Appendix A. ' in addition, the plant operability detennination processes described in Sections 4.2 and 4.3 are consistent with the basic intent of the ISA papef and the bases sections for the two specifications provided in Appendix A.
71
w
4.5 References /Standt.rds 11]
instmment Society of America Standard SSI.1 1979, " Process instmtrentation Tenninology",
p 33,1979.
[2] Ibid
[3] Generic Letter 9144,1991, "Clwiges in Technical S !ccification Sutveillance Intervals to Accommodate a 24 month Fuel Cycle."
- [4] Teley, C. R., Williams, T. P., "The Allowable Value in the Westinghouse Setpoint Methodology Fact or Fiction?" presented at the Thirty Seventh Power Instmmentation l
Symposium (4* Annual ISA/EPRI joint Controls and Automation Conference), Orlando Fl.,
June,1994.
[5] Ibid
[6] Ibid 72
wr$7mGH0uSE nan PsenaETART class 3 Pace n TABLE 4-1 WESTINGHOUSE PflOTECTION SYSTEM STS SETPOINT D.' PUTS M!LLSTGNE UNIT 3 FROTECTON OMNNEL SENSOR RACK NSTRWENT forTut OPERALUTY OPERABUTY SPAN TRIP (1E) (1.9) SETPONT POWER RANGE. NEVm0N FLUX - MGM SETPCBtf -
94% SPAN tm RTP 1 son RTP 2 POWE14 RANGE NEUTRON FLUX - LOW SETPOINT - g4% SPAN 7J0% RTP 2% RTP 2 3 POWER RANGE NEUTRON FLUI . MGH SETP0mi is t LOOP) - 0 4% SPAN 12M R*P en R'P 3 4 POWER RANT. MEUm0N FLUX - MGH POSmWE 8 WGfnT RATE - 04% SPAN tm Rt? 5 M RTP 4 s mTEmdEDIATE RANGE. ILGTRON RUX - 9 4 SPAN 12n RTP 2% RTP S e SOURCE RANGE NEUTRON RUX - 0 M SPAN 2OE.08 CPS tGE.8 CPS 6 7 OVERTEWTRATURE AT AT 04ANNEL - (11) 94% SPAN C) R8ECT10fes) T F4LOCP)
TAVG CHANNEL - pt) e 4 SPAN PRESSURIZER PRESSU5E CHA9MEL 00SENOL9st t754GP9) t M SPAN PGl 82% SPAN SAO CHfL'8EL - 9 4 SPAN 8 OVE31 POWER AT AT CHANIEL - (11) 04% SPAN QB F1.PICTIONF) 4 FLOOP)
Tess CHAfsEL - (f f) e 4% SPAN 9 OVERTEldPERATURE AT AT CHANNEL - (f f) S M SPAN 98) FUNCTIONN) 9 FI LOOP)
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APPENDIX A l
l I
SAMPLE MILLSTONE UNIT 3 SETPOINT TECHNICAL SPECIFICATIONS A1
SAFETY UMITS AND UMITING SAFETY SYSTEM SETTINGS 2.2 UMITING SAFETY SYSTEM SETTINGS REACTOR TRIP SYSTEM INSTRUMENTATION SETPOINTS 2.2.1 The Reactor Trip Sysiem Instrumentation Channel and Interlock Channel shall be OPERABLE.
APPLICABILITY: As shown for each channelin Tabie 3.3-1.
ACTION:
- a. With a Reactor Trip System Instrumentation Channel or Interlock Channel Norninal Trip Setpoint inconsistent with the value shown in the Nominal Trip Setpoint column of Table 2.2-1, adjust the Setpoint consistent with the Nominal Trip Setpoint value.
- b. With a Reactor Trip System Instrumentation Channel or Interlock Channel found to be inoperable, declare the channel inoperable and apply the applicable ACTION statement requirement of Specification 3.3.1 until the channelis restored to OPERABLE status.
A2
TABLE 2.81 REACTOR TRIP SYSTEM INSTRUMENTATION TRIP SETPOINTS functional Unit Nominal Trio setooint Allowable Value
- 1. Monval Reactor Trip N.A. N.A.
- 2. Power Range, Neutron Flux, High Setpoint
- 1) Fout Loops Operating 109% of RTP* 5109.6% RTP'
- 2) Threr Loops Operating 80% of RTP* 5 80.6% RTP*
Low Setpoint 25% of RTP* 5 25.6% RTP'
- 3. Power Range. Neutron Flux. 5% of RTP' with a 5 5.6% RTP' with a High Positive Rote time constant 2 2 seconds time constant 2 2 seconds i
l 4. Deleted
- 6. Source Range. Neutron Flux 10** cps 51.06 x 10** cps
- 7. Overtemperature AT o Four Loops Operating
- 1) Channals L 11 See note 1 See note 2
- 2) Channels lit, IV See note 1 See note 2
- b. Three Loops Operating
- 1) Channels 1.11 See note 1 See note 2
- 2) Channels ill IV See note 1 See note 2
- 8. Overpower AT See note 3 See note 4
- 9. Pressurizer Pressure - Low 1900 psia 21897.6 psto
- 10. Pressurizer Pressure - High 2385 pslo 5 2387.4 pslo
- 11. Pressurizer Water Level- High 89% of 5 89.3% of instrument span instrument span
- 12. Reactor Coolant Flow - Low 90% of loop 2 89.8% of loop design flow" design flow RTP Roted Thermal Power
- Minimum Measured Flow Per Loop = 1/4 of the RCS flow rate limit as listed in Section 3.2.3.1.o (four loops operating); 1/3 of the RCS flow rate limit as listed in Section 3.2.3.2.0 (three loops operating).
A3 Y.19
PEACTOR TRIP $YSTEM lt4STRUMENTATION TRIP $ETPOINTS functional Unli Nominal Trio Sefpg]n) Allowcble Valog
- 13. Steam Generator Water 18.1% of narrow 217.8% of narrow level Low Low range instrument span range instrument span
- 14. General Warning Alarm N.A. N.A.
- 15. Low $haf t Speed - Reactor 92.4% of RNS 2 92.2% RN3 Coolant Pumps
- 16. Turbino Trip
- a. Low Fivid Oil Pressure 500 psig Provided by plant
- b. Turbine Stop Valve Closure 1% open
- 17. Safety injection input N.s. N.A.
from ESF
- 18. Reactor Trip System Interlocks
- a. Intermediate Range 1 x 10"' omps 2 9.1 x 10* Amps l Neutron Flux. P-6
- b. Low Power Reactor Trips Block. P-7
- 2. P-13 input 10% RTP* Turbine 510.6% RTP*
. Impulse Pressure Equivalent
- c. Power Range Neutron Flux. P-8
- 1) Four Loops Operating 37.5% of RTP* 5 38.1% RTP*
- d. Power Range Neutron 51% of RTP* $ 51.6% RTP' Flux. P 9
- e. Power Range Neutron 9% of RTP 2 8.4% RTP' Flux. P 10 (Note 6) 19, Reactor Trip Breakers N.A. N.A.
- 20. Automatic Trip and interlock N.A. N.A.
Logic
- 21. Three Loop Operation N.A. N.A.
Bypass Circuitry RTP - Roted Thermal Power A4
TABLE 22-1 (Continued)
TABLE NOTATION NOTE 1: OVERTEMPERATURE AT AT (I + Tr 5) s (r, - K (1 + TJ) (T - T) + K3 (P - P) -f, (A1) }
AT, (1 + T 23) 2(I + T sS)
Where: AT is measured Reactor Coolant System AT, 'F; AT, is loop specific irdcated AT at RATED THERMAL POWER, 'F; 1 + t,S is the function generated by the Lead-lag cocpersator on measured AT; 1 + T,S t,, and T, are the time constants utilized in the lead-lag compensator for AT, t,2 8 secs., r, s 3 secs; K, s 1_20 (Four Loops Operating), s 120 (Three Loops Operating);
K,2 0.02456fF; 1+tS is the function generated by the lead-lag coiripersator for T,g 1+T 3 S t., and t 3are the time constants utilized in the lead-lag compensator for T, , T,2 20 secs _, T3 s 4 secs.
T is measured Reactor Coolant System average temperature. 'F; T' is loop specific indicated T, at RATED THERMAL POreR, s 587.1'F; K32 0.001311/ psi P is measured pressurizer pressure, psia; A-5
TABLE 2.2-1 (Continued)
TABLE NOTATION (Contned)
NOTE 1: (continued)
P'is nominal pressurizer pressure, 2 2250 psia; S is the Laplace transform operator, sec-';
and f,(AI) is a function of the indicated difference between top and bottom detectors of the power range neutron ion cheid#,s; with . w.-sr4 gains to be selected based on measured instrument response dunng plant startup tests calibrations such that-(1) for q - g between -26 percent and +3 percent, f,(AI) 2 0 (where q and q are giu.,ii RATED THERMAL POWER in the uppor ar'd lower halves of the core, rewtively, and q + 4 is the total THER7 AL POWER in perwii RATED TPERMAL POWER; (2) for each percent that the magnitude of (q - q,) exceeds -26 percent, the AT trip setpoint shall be automaticaliy reduced by 2 3.55 percent of its value at RATED THERMAL POWER.
(3) for each percent that the magnitude of (q - 4) exceeds +3 percent, the AT Trip Setpoint shall be auteiretically reduced by 21.98 percent of its value at RATED THERMAL POWER.
NOTE 2:
The channers maximum as left trip setpoint shat! not exceed its computed Trip Setpoint by more than the folic-; rig, J.4% AT span for the AT channel, 0.4% AT span for the Tavg channel,0.4% AT span for the Pressurizer Pressure channel and 0.8% AT span for the f(Al) channet A-6
TABLE 2.2-1 (Continued)
TABLE NOTATION (Continued)
NOTE 3: OVERPOYER AT A T (1 + T 5) s T8 -
AT, (1 + Tf) (I, - r((1 3
+ rf)) T - r, [T - 7"] }
Where: AT is measured Reactor Coolant System AT, "F; AT,is loop specific indicated AT at RATED THERMAL POYER,'F; 1 + T,S is the function generated by the lead-lag compensator on measured AT; 1+TS 2 T, and T2 are the time constants utilized in the lead-lag compensator for AT, t,2 8 sec, T2s 3 sec; K, s 1.09:
K3 2 0.02rF for increasing T, and K, s O for decreasing T,g TS 7
is the function generated by the rate-lag compensator for T,:
1+TS 7 17 is the time constant utilized in the rate-lag coe ansator for T,, t,210 sec; T is measured average Reactor Coolant System temperatee; *F; A-7
TABLE 2.2-1 (Continued)
TABLE NOTATION (Continued)
NOTE 3: (continued)
T' is loop specific indicated T, at RATED TiiERMAL POVER, s 587.1*F; K 2 0.00180FF when T > T' and K, s OFF when T s T*;
d S is the Laplace transform operator, see .
NOTE 4: The channers maximum as left trip setpoint shall not exceed its computed Trip Setpoint by more than 0.4% AT span the AT channel and 0.4% AT span for the Tavg channel.
NOTE 5: Setpoint is for increasing power.
NOTE 6: Setpoint is for decreasing power.
A-8
2.2 UMITING SAFETY SYSTEM SETTINGS BASES 2.2.1 REACTOR TRIP SYSTEM INSTRUMENTATION SETPOINTS The NominalTrip Setpoints specified in Table 2.21 are the nominal volves at which the reactor trips are set for each functional unit. The Allowable Values (NominalTrip Selpoints i the calibration tolerance) are considered the Limiting Safety System Settings as identified in 10CFR50.36 and have been selected to ensure that the core and Reactor Coolant System are prevented from exceeding their safety imlis during normal operation and design basis ant'cipated operational occunences and to assist the Engineered Safety Features Actuu,Dn System in mitigating the consequences of accidents. The Selpoint for o Reactor Trip System or interlock function is considered to be consistent with the nominal value when the measured "as left" Selpoint is within the administrativeY controlled (i) calibrollon tolerance identified in plant procedures (which specifies the difference between the Allowable Value and NominalTrip Setpoint). AdditionalY, the NominalTrip Setpoints may be adjusted in the l conservative direction provided the delta between the NominalTrip Setpoint and the i Allowable Value remains unchanged.
I Maintenance and Test Equipment accuracy is administratively controlled by plant procedures and is included in the plant uncertainty calculations as defined in WCAP-10991. Operability determinations are based on the use of Maintenance and Test Equipment that conforms with the occuracy used in the plant uncertainty calculation.
Maintenance and Test Equipment should be consistent with the requirements of ANSI /
ISA 51.1-1979 or the most accurate practicable.
The Allowable Value spesified in Table 2.2-1 is the initiot volve for consideration of channel operability, if the process rock bistable setting is measured within the "as left" calibration tolerance, which specifies the difference between the Allowable Value and Nominal trip Setpoint, then the channells considered to be operable.
AdditionalY, on administratively controlled limit for operability of a device is determined by device drift being less than the value required for the surveillance interval. In the event ihe device exceeds the administrativeY controlled limit, operability of the device may be evolvoted by other device performance characteristics, e.g., comparison to historical device drift data, calibrollon characteristics, response chorocteristics cad short term drift characteristics. A device (RTD, relay, transmitter, process rock module, etc.), whose "as found" value is in excess of the caEbration tolerance, but within the operability criteria (administrativeY controlled limit), is considered operable but must be recalibrated such that the "as left"value is within the two sided (1) calibration tolerance. Plant procedures set administrative limits ("os left" and "os found" criteria) to control the determination of operability by setting minimum standards based on the methodology in WCAP-10991 and the uncertainty volves included in the determination of the Nominal Trip Seipoint, and allow the use of other device characteristics to evaluate operability. REPORTABLE EVENTS are identified when the minimum number of channels required to be operable are not met.
A9 j
j
LIMfilNG SAFETY SYSTEM SETTINGS BASES 2.2.1 REACTOR TRIP SYSTEM INSTRUMENTATION SETPOINTS (Continued)
The methodoivgy, as defined in WCAP-10991 to derive the NominalTrip Setpoints, is based upon combining all of the uncertainties in the channels. Inherent in the determination of the NominalTrip Setpoints are the magnitudes of these channel uncertaintles. Sensors and other instrumentation utilized in these channels should be capable of operating within the allowances of these uncertainty magnitudes.
Occasional drift in excess of the allowance may be determined to be acceptable based on the other device performance characteristics. Device drift in excess of the allowance that is more than occasional, may be indicative of more serious problems and would warrant further investigation.
The various reactor trip circuits automallcally open the reactor irlp breakers whenever a condition monitored by the Reactor Trip System reaches a preset or calculated level. In addition to redundant channels and trains. the design approach provides l Reactor Trip System functional diversity. The functional capability at the specified trip l setting is required for those anticipatory or diverse reactor trips for which no direct i credit was assumed in the safety analysis to enhance the overallreliability of the i
Reactor Trip System. The Reactor Trp System initiates a turbine trip signal whenever reactor trip is initiated. This prevents the reactivity insertion that would otherwise result from excessive Reactor Coolant System cooldown and thus ovolds unnecessary actuation of the Engineered Safety Features Actuation System.
A 10
lt1SIRUMENTATION 3/4.3.2 ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.2 The Engineered Safety Features Actuation System (ESFAS) instrumentation enannels and interlocks shown in Table 3.3 3 shall be OPERABLE.
APPLICABILITY: As shown in Toble 3.3-3.
ACTION:
i c. With on ESFAS Instrumentation Channel or Interlock Channel NominalTrip Setpoint inconsistent with the value shown in the NominalTrip Setpoint column of Table 3.3 4, adjust the Setpoint consistent with the NominalTrip Setpoint volve,
- b. With on ESFAS Instrumentation Channel or Interlock Channel found to be inoperable declare the channelinoperable and apply the applicable ACilON statement requirements of Table 3.3-3 until the channelis restored to OPERABLE status.
A 11
INSTRUMENTAllON '
SURVEILLANCE REQUIREMENTS 4.3.2.1 .
Each ESFAS instrumentation channel and interlock and tha automatic actuation logic and relays shall be demonstrated OPERABLE by the performance of ine ESFAS Instrumentation Surveillance Requirements specified in Table 4.3 2.
4.3.2.2 The ENGINEERED SAFETY FEATURES RESPONSE 11ME' of each ESFAS function shall be demonstrated to be within the limit at least once per 24 months. Each fest shallinclude at least one train such thol both trains are tested at least once per 48 months and one channel (to include input relays to both trains) per function such that allchannels are tested at least once per N times 24 months where N is the total number of redundant channels in a specific ESFAS function as shown in the ' Total No.
of Channels" column of Table 3.3 3.
1 A 12
TABLE 3.3-4
[L{GltfEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION TRIP.$ETPOINTS Functional Unli Nomino! Trio Sec. q]DJ Allowable Volug
- 1. Safety injection (Reactor Trip. Feedwater isolation. Control Building isolation (Monvolinitiation Only), Start Diesel Generators, and Service Water)
- a. MonvolInitiation N.A. N.A.
- b. Automatic Actuation Logle N.A. N.A.
- c. Containment Pressure High-1 17.7 psia 517.9 psia
- d. Pressurizer Pressure Low 1) 2)
Channels I and 11 Channels lil and IV 1892 psia 1892 psia 21889.6 pslo 21889.6 psia
( -
- e. Steamline Pressure - Low 658.6 psig* 2 654.7 psig*
- 2. Containment Spray (CDA) =
l o. MonvalInitiation N.A. N.A.
- b. Automatic Actuation Logic N.A. N.A.
j and Actuation Relays
- c. Containment Pressure - High-3 22.7 psia 5 22.9 psia l 3. Contolnment isolation
- a. Phase "A" Isolation
- 1) Monval Initiation N.A. N.A.
- 2) Automatic Actuation Logic N.A. N.A.
and Actuation Relays
- 3) Safety injection See item 1 above for all Safety injection Trip Setpoints,
- b. Phase "B" Isolation
- 1) Manual Initiation N.A. N.A.
2l Automatic Actuation Logic N.A. N.A.
and Actuation Relays
- 3) Containment Pressure - 22.7 pslo 5 22.9 pslo High-3 A 13
TABLE 3.3-4 (Continued)
LtfQlNEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION TRIP SETPOINTS functional Unit Nominal Trio Setoolnt Allowable Volyg
- 4. Steam Line isolation
- o. Manual initiotion N.A. N.A.
- b. Automatic Actuation Logic N.A. N.A.
and Actuation Relays
- c. Containment Pressure High-2 17.7 psic 517.9 pslo
- d. Steamline Pressure Low 658.6 psig' 2 654.7 psig' O. Steam Line Pressure - 100 psih" 5103.9 psi /s" Negative Rate - High
- 5. Turbine Trip and feedwater isolation
- a. Automatic Actuation Logic N.A. N.A.
Actuation Relays
- b. Stoom Generator Water 80.5 % of 5 80.89. of Level-High-High (P-14) narrow range narrow ronge instrument span instrument span
- c. Safety injection Actuation Logic See item I above for all Safety injection Trip Setpoints,
- d. Tavg Low Coincident with Reactor Trip (P-4)
- 1) Four Loops Operating 564'F 2 563.6*F
- 2) Three Loops Operating 564'F 2 563.6'F
- 6. Auxillary Feedwater
- o. Manual Initiation N.A. N.A.
- b. Automatic Actuation Logic N.A. N.A.
and Actuation Relays
- c. Steam Generator Water Level-Low-Low
- 1) Start Motor- 18.1 % of 217.8% of Driven Pumps narrow range narrow range instrument span instrument span A 14
TABLE 3.324 (Continusd)
ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION TRIP SETPOINTS -
Egncilonal Unit ~ NominalTrio Setoolnt Allowable Value
- 6. Avtliary Feedwater (continued)
- 2) Stort Turbine- 18.1 % of- 217.8% of Driven Pumps narrow lange narrow range instrument span instrument span d; Sately injeciloa See item 1 above for all Sofety injection Trip ,
Setpoints,
- e. Lcss of Offslie Power 2800V "*
Stnri Motor Driven Pumps
- f. Containment Depressurization See item 2 obove for all CDA Trip Setpoints.
Actuation (CDA) Stort Motor-Driven Pumps
- 7. Control Building Isolation
- a. Monval Actuaticn N.A.
b, N.A.
Manual Safety injection N.A. N.A. -
Actuation
- c. Automatic Actuation Logic N.A. N.A.
anc Actuation Relays
- d. Containment Pressure - 17.7 pslo s 17.9 pslo High-1
- e. Control Bu0 ding inlet 1.5 x 104 pel/cc *"
Ventilation Radiation
- 8. Loss of Power
- a. 4 kV Bus Undervoltage *" "*
(Loss of Voltage) b, 4 LV Bus Undervoituge "* **
(Grid Degraded Voltage)
- 9. ' Enginevred Safety Features Actuation System Interlocks ,
- o. Pressurizer Pressure. P-11 1999.7 psia 5 2002.6 pslo
- b. Low-Low Tovg. P-12 553*F 2 552.6*F
- c. ' Reactor Trip, P-4 N.A. -N.A.
- 10. Emergency Generator Load N.A. N.A.
Sequencer I_
A-15
TABLE 3.3-4 (Continued)
Tg,6, [JOTATIONS Time constants villized in the lead 4ag controller for Steam Line Pressure-Low are it 2 50 seconds and t:5 5 seconds. CHANNEL CAllBRATION shall ensure that these time constants are adjusted to these valves.
The time constant utilized in the rate-lag controller for Steam Line Pressure - Negative Rate - High is greater than or equal to 50 seconds. CHANNEL CAllBRATION shall ensure that this time constant is adjusted to this valve.
To be prostJed by plant.
t A-16
. ~ - - - - - - -- ~ . - . - . . . - -- . - -
3.4.3 INSTRUMENTATION BASES 3/4.3.1 and 3/4.3.2 REACTOR TRIP SYSTEM INSTRUMENTATION AND ENGINEERED SAFETY FEATURES ACTUATION 3YSTEM INSTRUMENTATION The OPERABILITY of the Reactor Trip System and the Engineered Safety Features Actuation System instrumentation and interlocks ensures that: (1) the associated ,
action and/or Reactor trip will be initiated when the perameter monitored by each ,
- channel or combination thereof reaches ib setpoint, (2) the specified coincidence '
logic is maintained. (3) sufficient redundancy is maintained to permit a channel to be out of service for testing or molntenance, and (4) sufficient system functional capability is available from diverse parameters.
The. OPERABILITY of there systems is required to provide the overallreliability, redundancy, and diversity assumed available in the facility' design for the protection and mitigation of accident and transient conditions. The integrated operation of each of these systems is consistent with the assumptions used in the safety analyses.
The Surveillance Pequirements specified for these systems ensure that the overall i
system functional capability is maintained ccmparable to the original design standards. The periodic. surveillance tests performed at the minimum frequencies are-j sufficient to demonstrate this capab!Gty.
The Engineered Safety Features Actuation System NominalTrip Setpoints specified in Table 3.3-4 are the nominal values at which the bistables are set for each functional
- Unit. The Allowable Values (NominalTrip Setpointsi the calibration tolerance) are -
. considered the Limiting Safety System Settings as identified in 10CFR50.36 and have 4
4 been selected to mitigate the consequences of accidents. A Selpoint is considered to be consistent with the nominal value when the measured "as left" Selpoint is within the administratively controlled (i) calibration tolerance identified in plant procedures (which specifies the difference between the Allowable Value and NominalTrip i Setpoint). Additionally, the NominalTrip Setpoints may be adjusted in the conservative direction provided the delta between the NominalTrip Seipoint and the Allowable Value remains unchanged.
Maintenance and Test Equipment accuracy is administratively controlled by plant
- procedures and is included in the plant uncertainty calculations os defined in WCAP--
10991. Operability determinations are based ci, the use of Maintenance and Test
_ Equipment that conforms with the accuracy used in the plant uncertainty calculation.
. Maintenance and Test Equipment should be consi* tent with the requirements of ANSI /
ISA 51.1-1979 or the most accurate practicable.
The Allowable Value specified in Table 3.3-4 is the initial value for consideration of channel operability. If the process rock bistable setting is measured within the "os left" calbration tolerance, which specifies the difference between the Allowable Value and NominalTrip Setpoint, then the channelis considered to be operable.
Additionally, on administratively controlled limit for operability of a device is i
t A-17
INSTRUMENTATION BASES
' 3/4.3.1 and 3/4.3.2 REACTOR TRIP SYSTEM INSTRUMENTATION AND ENGINEERED SAFETY FEATURES ACTUATION SYSTEM INSTRUMENTATION (continued) determined by device drift being less than the volve required for the surveillance interval in the event the device exceeds the administratively controlled limit,
' operabi0ty of the device may be evaluated by other device performance characteristics, e.g., comparison to historical device drift data, caHbratiori characteristics, response characteristics and short term drift characteristics. A device (RID, relay, transmitter, process rock module, etc.), whose "as found" value is in excess of the calibration tolerance, but within the operabiHty criteria (administratively controlled limit),is considered operable but must be recolibrated such that the "os left" value is within the two sided (1) coEbration tolerance. Plant procedures set I
administrative limits ("os left" and "as found" criteria) to controi the determination of operability by setting minimum standards based on the melnodology in WCAP-10991 and the uncertainty values included in the determination of the NominalTrip Setpnint, and allow the use of other device characteristics to evaluate operability. REPORTABLE EVENTS are identified when the minimum number of channels required to be operable are not met.
The methodology, os defined in WCAP-10991 to derive the Nominal Trip Setpoints, is based upon combining all of the uncertainties in the channels. !nherent in the determination of the NominalTrip Setpoints are the magnitudes of these channel uncertainties. Sensors and other instrumentation utilized in these channels should be capable of operating within the allowances of these uncertainly magnitudes.
Occasional drift in excess of the allowance may be determined to be acceptable based on the other device performance characteristics. Device drift in excess of the allowance that is more than occasional, may be indicative of more serious problems and would warrant further investigation.
1 i
A-la
_-