ML20100P917
| ML20100P917 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 01/16/1996 |
| From: | Van Wyk T COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20100P861 | List: |
| References | |
| NED-I-EIC-0208, NED-I-EIC-0208-R00, NED-I-EIC-208, NED-I-EIC-208-R, NUDOCS 9603110406 | |
| Download: ML20100P917 (31) | |
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Exhibit C NEP-12-02 Rzvision 0 COMMONWEALTH EDISON COMPANY CALCULATION TITLE PAGE CALCULATION NO. NED-I-EIC-0208 PAGE NO.: 1 of 30 m SAFETY RELATED D REGULATORY RELATED D NON-SAFETY RELATED CALCULATION TITLE:
Main Steam Tunnel Temperature Isolation Setpoint Error Analysis STATION / UNIT: LaSalle Units 1 & 2 SYSTEM ABBREVIATION: LD 1
EQUIPMENT NO.: PROJECT NO.: N/A TE- 1 ( 2 ) E31-N02 9A, B, C, D TE -1 ( 2 ) E31 -N03 0 A, B, C, D TS -1 ( 2 ) E31 -N615A, B, C, D REV: 0 STATUS: Approved For Use QA SERIAL NO. OR CHRON NO.
A n il l , ,
PREPARED BY: Thomas J.
Van Wyk [/k m d/d/M Ml Q ATE: t//6/f/
-v yv ( (
REVISION
SUMMARY
Initial Issue ,
i I
DO ANY ASSUMPTIONS IN THIS CALCULATION REQUIRE LATER VERIFICATION O YES a NO REVIEWED BY: II/ O b/u/h DATE: /[/d / 7 6 i
f REVIEW METHOD: OgrA fcgg gggjgg COMMENTS (C OR NC) : hC iA /
DATE: t-W-%
APPROVED BY: ,/'7./_dbf/~
9603110406 960301 PDR ADOCK 05000373 P PDR j
Exhibit C NEP-12-02 Rsvision 0 i
COMMONWEALTH EDISON COMPANY CALCULATION REVISION PAGE l l
CALCULATION NO. NED-I-EIC-0208 PAGE NO.: 2 of 30 )
REV: STATUS: QA SERIAL NO. OR CHRON NO. l PREPARED BY: DATE:
REVISION
SUMMARY
DO ANY ASSUMPTIONS IN THIS CALCULATION REQUIRE LATER VERIFICATION O YES O NO REVIEWED BY: DATE:
REVIEW METHOD: COMMENTS (C OR NC) :
APPROVED BY: DATE: l l
REV: STATUS: QA SERIAL NO. OR CHRON NO. ,
l
\
l PREPARED BY: DATE: (
REVISION
SUMMARY
- l DO ANY ASSUMPTIONS IN THIS CALCULATION REQUIRE LATER VERIFICATION O YES O NO REVIEWED BY: DATE:
REVIEW METHOD: COMMENTS (C OR NC) :
APPROVED BY: DATE:
i
Exhibit D NEP-12-02 R; vision O COMMONWEALTH EDISON COMPANY l CALCULATION TABLE OF CONTENTS PROJECT NO. N/A CALCULATION NO. NED-I-EIC-0208 REV. NO. O PAGE NO. 3 OF 30 DESCRIPTION PAGE NO. SUB-PAGE NO.
TITLE PAGE 1 REVISION
SUMMARY
2 TABLE OF CONTENTS 3 f i
CALCULATION SECTION 1.0 PURPOSE and OBJECTIVE 4 SECTION 2.0 METHODOLOGY and ACCEPTANCE 4 CRITERIA SECTION
3.0 REFERENCES
5-6 4.0 DESIGN INPUTS 7 l SECTION SECTION 5.0 ASSUMPTIONS 8 SECTION 6.0 INSTRUMENT CHANNEL 8 ,
CONFIGURATION l l
SECTION 7.0 PROCESS PARAMETERS 9 l l
SECTION 8.0 LOOP ELEMENT DATA 9-10 SECTION 9.O CALIBRATION INSTRUMENT DATA 11 ;
SECTION 10.0 CALIBRATION PROCEDURE DATA 12 SECTION 11.0 MODULE E.RRORS 13-26 l
SECTION 12.0 INSTRUMENT CHANNEL TOTAL 27 l ERROR l SECTION 13.0 ERROR ANALYSIS 28-29 SECTION 14.0 ERROR ANALYSIS
SUMMARY
& 30 CONCLUSIONS 1
SECTION 15.0 ATTACHMENTS J l
l
Exhibit E
[ NEP-1242 RIvi; ion 0 l
i COMMONWEALTH EDISON COMPANY Cf .ULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 4 of 30 1.0 PURPOSE / OBJECTIVE OF CALCULATION
! The purpose of this calculation is to determine the calibrated
! setpoint and allowable value for the Main Steam Tunnel Area Vent l High Differential Temperature Isolation instrument channels. This
- channel provides a Tech Spec setpoint and initiates a Group I l
isolation of the MSIVs and MSL drain valves on high differential temperature.
The calculation is valid under normal operating and accident environmental cenditions and allows for all normal operating and accident errors, thus ensuring Tech Spec compliance for the following instruments:
TE-1E31-N029A,B,C,D TE-2E31-N029A,B,C,D TE-1E31-NO30A,B,C,D TE-2E31-N030A,B,C,D TS-1E31-N615A,B,C,D TS-2E31-N615A,B,C,D 2.0 METHODOLOGY AND ACCEPTANCE CRITERIA The methodology used herein is based on Comed documents, References 3.2 and 3.3.
2.1 The evaluation of errors used to determine the " Total Error" (TE) is consistent with the above methodology with the following
- exception
(a) The calibration tolerance is assumed to describe the limits For a random error, this of the as-left component outputs.
corresponds to 100% of the population and can be statistically represented by a 3 sigma value. Per References 2 and 3, the " Setting Tolerance" (ST) is defined as a random error which is due to the procedural allowances given to the technician performing the calibration. For this calculation:
ST = calibration tolerance / 3 2.2 As stated in Section 1, the objective of this calculation is to determine the available margin between the analytical limit and the nominal Tech Spec Setpoint. The acceptance criteria for this calculation is that a positive margin is required.
l l
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REVISION NO. O
?
Exhibit E NEP-12-02 Revisimi 0 "
COMMOhWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 5 of 30
3.0 REFERENCES
3.1 ANSI /ISA-S67.04-1988, "Setpoints for Nuclear Safety Related Instrumentation."
3.2 TID-E/I&C-20, " Basis for Analysis of Instrument Channel Set-point Error & Loop Accuracy", Rev. O, dated 4/6/92.
3.3 TID-E/I&C-10, " Analysis of Instrument Channel Setpoint Error and l Instrument Loop Accuracy", Rev. O, dated 4/6/92.
3.4 LaSalle Station Procedures LIS-MS-10EA (Rev. 3), " Unit 1 Main Steam Tunnel Area Vent High Differential Temperature Isolation Instrument Channels A and C Refuel Calibration", dated 3/22/94.
LIS-MS-105B (Rev. 3), " Unit 1 Main Steam Tunnel Area Vent High Differential Temperature Isolation Instrument Channels B and D Refuel Calibration", dated 2/18/94.
LIS-MS-205A (Rev. 3), " Unit 2 Main Steam Tunnel Area Vent High Differential Temperature Isolation Instrument Channels A and C Refuel Calibration", dated 2/14/94.
LIS-MS-205B (Rev. 3), " Unit 2 Main Steam Tunnel Area Vent High Differential Temperature Isolation Instrument Channels B and D Refuel Calibration", dated 3/22/94.
3.5 LaSalle Station UFSAR, Rev 6, Tables 3.11-7, 16, 24, dated April 1990.
3.6 Riley Company; Instruction and Operating Manual, Model 86 Temp-Matic Thermocouple Monitor, Revision 1.
3.7 Commonwealth Edison Company Calculation No. NED-I-EIC-0255,
" Measurement & Test Equipment Accuracy Calculation For Use With CECO BWRs", Rev. O, CHRON # 208597.
3.8 Commonwealth Edison Company Instrument Database, Specific and i Supplemental Data Sheet for the follc'ing instruments: l TE-1E31-N029A,B,C,D TE-2E31-N029A,B,C,D !
TE-1E31-NO30A,B,C,D TE-2E31-N030A,B,C,D 1 TS-1E31-N615A,B,C,D TS-2E31-N615A,B,C,D 3.9 CECO Environmental Qualification Equipment Identification Binder, LaSalle Units 1 & 2, Project No. 6548/49-00, CQD File No. 017141, Rev. 05, Sheet D1 of D4, approval date 9/12/91.
1 3.10 GE Data Sheet Drawing No. 145C3224, " Temperature Element", Rev.
2, dated 3/22/74.
REVISION NO. O
Exhibit E NEP-12-02 R: villin 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 6 of 30 3.11 ASTM, American National Standard C96.2-1973, " Standard )
Temperature - Electromotive Force (EMF) Tables for l Thermocouples".
3.12 Sargent & Lundy Report SL-4493, " Final Report on Insulation Resistance and Its Presumed Effects on Circuit Accuracy LaSalle County Station", dated October 12, 1988.
3.13 Sargent & Lundy Calculation CID-MISC-01, " Instrument Loop Evaluation for Parasitic Resistance", Rev. O, dated 2/3/87.
3.14 Acton Environmental Testing Corporation Test Report No. 16436-82N, " Nuclear Qualification Testing of Temperature Measurement Devices Per IEEE Std. 323-1974 and IEEE Std. 344-1975", Revision 3, dated 1/31/84.
3.15 LaSalle Station Unit 1 Technical Specifications, as amended through Amendment 107, dated October 20, 1995, and LaSalle Station Unit 2 Technical Specifications, as amended through Amendment 93, dated October 20, 1995.
3.16 Transmation IS 1061 Thermocouple Calibrators Specification, Fluke 2160A Digital Thermometers Specification Data Sheets, and Fluke 8500A Digital Multimeter Resistive value Specification.
3.17 Comed Calculation BSA-L-95-05, rev. O. (for analytical limit) . ;
3.18 Record of telephone conversation with General Electric (Kaz Utsumi) stating that the Reference Accuracy for the Riley Temp-matic Model 86 in this application is 2% of span. This will be further documented in a letter from GE to follow. (Attachment 1).
I REVISION NO. O
Exhibit E NEP-12 02 R2vhion 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 7 of 30 4.0 DESIGN INPUTS 4.1 Thermocouple extension wire has the identical conductor types as the thermocouple and the thermocouple head terminals, and therefore there is no emf drop or rise at the point of connection on the thermocouple. Per Reference 3.6, the resistance drop of the extension wire will introduce an error of 13*F.
4.2 Temperature, radiation and humidity errors, when available from the manufacturer, were evaluated with respect to the normal operating conditions specified in the LaSalle Station EQ zones.
The EQ zone requirements for each instrument was obtained from the LaSalle County Station EQ zone maps.(Reference 3.5) 4.3 For a Type E thermocouple, the output span for O'F to 150 F is 5.067 mV, based on a reference junction temperature of 32*F.
Be:ause the installed reference junctions are not maintained at 32*F, the actual thermocouple output will vary by a constant equal to the emf developed between 32*F and the actual temperature of the reference junctions. Because the thermocouple output varies by a constant, the span of 5.067 mV remains the same, and is used in this calculation.
i l
I i
REVISION NO. O )
i
Exhibit E NEP-12-02 Revision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. .NED-I-EIC-0208 PROJECT NO. N/A PAGE 8 of 30 5.0 ASSUMPTIONS 5.1 Published instrument vendor specifications are considered to be 2 sigma values unless specific information is available to indicate otherwise.
5.2 Temperature, humidity and pressure errors have been incorporated -i when provided by the manufacturer. Otherwise, these errors are assumed to be included within the manufacturer's reference accuracy specification.
5.3 Evaluation of M&TE errors is based on the assumption that the test equipment listed in Section 9.0 is used. Use of test equip- l ment less accurate than that listed will require evaluation-of the effect on calculation results.
5.4 Drift error has been assumed to be 0.5% of Setpoint per 18 month, unless specified otherwise by the manufacturer. The calculated <
drift error will be adjusted for surveillance intervals of l greater or lesser length based on calibration frequency.
5.5 In accordance with Reference 3.7, it is assumed that the M&TE :
listed in Section 9.0 is calibrated to the required manufacturer's recommendations and within the manufacturer's required environmental conditions. As such, It is assumed that the calibration standard accuracy error of M&TE is negligible !
with respect to the other terms. l 1
i 5.6 Radiation induced errors associated with normal environments have been incorporated when provided by the manufacturer. Otherwise, these errors are assumed to be small and capable of being adjusted out each time the instrument is re-calibrated.
Therefore, unless specifically published by the equipment vendor, i the normal radiation errors can be assumed to be included within the instrument drift related errors.
5.7 A minimum temperature of 60*F was assumed for general access areas in the reactor building.
6.0 INSTRUMENT CHANNEL CONFIGURATION The MS Tunnel area differential temperature loop consists of two thermocouples each equipped with thermocouple extension wire, feeding a differential temperature switch.
REVISION NO. O
Exhibit E NEP-12-02 Redsim o COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 9 of 30 7.0 PROCESS PARAMETERS Temperature (Max) 212*F Pressure (Max) 40 PSIG for first 10 sec.
Radiation 1 x 10E7 Rads Relative Humidity Steam 8.0 LOOP ELEMENT DATA 8.1 PYCO Model 102-9039-11-6 Thermocouple (Reference 3.9)
From References 3.10, and 3.11, Thermocouple Type: Chromel-Const. (Type E)
Temperature Range: 32* to 600*F Accuracy: i 2*F 8.1.1 Environmental Data for Thermocouple Location Thermocouple Locations (Reference 3.8 and 3.9): Reactor Building, !
Main Steam Tunnel.
TE-1 (2 ) E31-N02 9A-D Local Mount EQ Zone HSC i TE-1 ( 2 ) E31-N03 0A-D Local Mount EQ Zone H5C Normal Operating Conditions for Environmental Zone H5C. l (Reference 3.5)
Temperature 60*F-130*F (Assumption 5.7)
Pressure -0.4" W.G.
Radiation 6 x 10' Rads (40-Year Dose)
Relative Humidity 20 - 95% l Accident Conditions for Environmental Zone H5C. (Reference 3.5)
Temperature 60'F-212 F (Assumption 5.7) ]
Pressure 40 PSIG for first 10 sec.
Radiation 1 x 10 7Rads (40-Year Dose) l Relative Humidity Steam I l
REVISION NO. O
Exhibit E NEP-12-02 <
Revision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 10 of 30 l
8.2 Riley Model 86, Temp-Matic Thermocouple Monitor (Reference 3.8) l From Reference 3.6, Reference Accuracy: i 2% of span (Ref. 3.18)
Repeatability: i 0.25% of span Hysteresis: i 0.1% of span Conformity: i 0.65% span Temperature Limits: 14* to 140*F Line Voltage Effect: i 0.5% of span over range of i
normal operating voltages Normal Operating Voltage: 120 VAC i 10%
Maximum loop Resistance: 500 0 Impedance: 250 KO l
8.2.1 Environmental Data for Temperature Switch Location Switch Locations (Reference 3.8): Unit 1/2 Control Room TS-1(2)E31-N615A,C 1 ( 2 ) H13 -P632 EQ Zone CIA TS-1 (2 ) E31-N615B , D 1 (2) H13-P64 2 EQ Zone CIA Normal Operating and Accident Conditions for Environmental Zone CIA. (Reference 3.5)
Temperature 72'F-74*F Pressure 0" to +0.25" W.G.
Radiation 1 x 10 3Rads (40-Year Dose)
Relative Humidity 35 - 45%
REVISION NO. O
ExhiWt E i NEP 12-02 l l
R; vision 0 l COMMONWEALTH EDISON COMPANY l l
! CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 11 of 30 9.0 CALIBRATION INSTRUMENT DATA Per the station procedures (Reference 3.4) the following devices may potentially be used as measurement and test equipment when performing calibrations on the devices within the subject instrument loop.
MTE2 n (Reference 3.7 and 3.16)
Fluke Model 8500A Digital Multimeter ;
Range 100 mVdc Resolution 0.001 mV Calibrated Accuracy i(0.005% reading + 8 counts)
Temperature Coefficient t(0.0003% rdg + 0.5 count) /*C (From O' to 18' and 28' to 5 0
- C) l l
1 l
+
1 REVISION NO. O
Exhibit E NEP-1242 Revision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 12 of 30 10.0 CALIBRATION PROCEDURE DATA The Instrument Calibration Procedures (Reference 3.4), provide the following:
Calibrated Span: Oo to 150*F Allowable Range: 2.143 to 2.248 mVdc (Setting Tolerance) (-0. 053/+0. 052 mVdc)
Nominal T. S. Setpoint: 65'F (2.196 mVdc) (Ref. 3.17)
Analytical Limit: 72.5'F (2.450 mVdc) (Ref. 3.17)
Calibration Frequency: Refuel (24 months)* j Late Factor: 25% (6 months)
- NOTE: Current calibration frequency is 18 months.
Calculation will use 24 months to be more conservative and to allow for the proposed 24 month fuel cycle.
REVISION NO. O
Exhibit E NEP-12-02 R: vision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 13 of 30 11.0 THERMOCOUPLE ERRORS (MODULE 1)
The thermocouple has an analog input and an analog output.
Therefore, it is classified as an analog module.
11.1 Random Error, Normal Operating Conditions (oln) 11.1.1 Thermocouple Reference Accuracy (RA1)
The thermocouple Reference Accuracy is determined by direct application of the Vendor's Specification listed in Section 8.1.
RA1 = i 2.0'F The Vendor's specification for accuracy is a 2a value.
(Assumption 5.1)
RAl gg = f (2. 0*F/2]
= i 1.0*F 11.1.2 Thermocouple Calibration Error (CAL 1)
The existing Station Procedures do not calibrate the thermocouples. Therefore:
CAL 1 = 0 11.1.3 Thermocouple Setting Tolerance Error (ST1)
Since the thermocouples are not calibrated, there is no setting tolerance. Therefore:
ST1 = 0 11.1.4 Random Input Errors (ainin)
The thermocouple is the first module in the loop. Therefore:
ainin = 0 REVISION NO. O l
ExhiWt E NEP-12-02 RIvision 0 l
l COMMONWEALTH EDISON COMPANY NED-I-EIC-0208 PROJECT NO. N/A PAGE 14 of 30 CALCULATION NO.
11.1.5 Resistance Drop of the Extension Wire (oRDin)
Since the thermocouple extension wires are made of the same material as the thermocouple itself, there is no emf rise or dren across the thermocouple head terminals. However, there is a resistance drop across the extension wire, which is routed through the reactor building and auxiliary building to the control room. Per Design Input 4.1, the resistance drop of thermocouple extension wire results in an error of 13.0'F.
ORDin = i 3.0*F The resistance drop value is a 20 value. (Assumption 5.1) 1 ORDin g ,3 = i 3.0*F / 2
= i 1.5'F 11.1.6 Calculation of Thermocouple Random Error (oln) j ain = i[(RA1)2 + (CAL 1)2 + (ST1)2 + (ainin)2 ,
( oRDin) 2) o.5
= i [ (1. 0
- F) 2 + (0)2 + (0)2 + (0)2 + (1. 5 F) 2 30.5
= i 1.802776*F 11.2 Random Error, Accident Conditions (ala)
For the purpose of this calculation, it is assumed that the random error determined for normal operating conditions (Section 11.1.6) is the same error that would occur during accident conditions since random errors are not dependent on the environmental conditions.
ola = 01n = i 1.802776'F
= 1 1.802776'F (5.067 mV/150*F) = 0.060898 mV REVISION NO. O
Exhibit E NEP 12-02 RIvision 0 j
COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 15 of 30 l
l 11.3 Non-Random Errors Normal Operating Conditions (Zeln) 11.3.1 The thermocouples are passive devices which produce a millivolt signal proportional to temperature. As such, they are not affected by the following non-random errors:
Humidity Errors: eHin =0 l Radiation Errors: eR1n =0 Seismic Errors: eSin =0 i Static Pressure Effects: eSPin = 0 l Ambient Pressure Errors: eP1n =0 l Power Supply Effects: eVin =0 ,
Drift: eD1n =0 l 11.3.2 Temperature error (eTin)
The thermocouples are designed to exhibit a precise temperature '
effect, which is used to develop the signal provided to the loop.
Since the thermocouples are designed to function in temperatures well above the system design temperature, there is no temperature error other than the accuracy error. Therefore, eTin = 0 11.3.3 Insulation Resistance Error (eIRin)
There are no terminal blocks in 100% relative humidity areas.
References 3.12 and 3.13 state that insulation resistance error for thermocouples is negligible, therefore, eIRin =0 11.3.4 Non-Random error for Normal Operating Conditions !
Eeln = eHin + erin + eSin + eSPin + eP1n + eVin + edin +
eTin + eIRin l
=0+0+0+0+0+0 +0+0+0 Eeln =1 0F l l
REVISION NO. 0
ExhiWt E NEP 12-02 Revision 0 COMMONWEALTH EDISON COMPANY CALCULATJ.ON NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 16 of 30 11.4 Non-Random Errors Accident Conditions (Zela) 11.4.1 Seismic Error (eSla)
Seismic testing was performed on selected Pyco thermocouple ;
models. Per Reference 3.14, the tested units demonstrated l consistent calibration readings both prior to and following l seismic tests. Therefore, seismic error is considered negligible. l 1
eSla = 0 i
11.4.2 Radiation Error (eRia)
There are no radiation errors described in the Vendor's specification for the thermocouple. Per Reference 3.14, the radiation dose rate for the exposure of the instrument was 0.80 x 106 rads per hour for 276.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, which resulted in a radiation dose of 2.2112 x 10s rads. Per Section 8.1.1, for accident conditions, a 40-year dose is 1 x 10 rads.
7 The test exposure was greater than the accident dose, therefore, radiation error will be considered to be negligible.
eRia = 0 11.4.3 The thermocouples are passive devices which produce a i millivolt signal proportional to temperature. As such, they )
are not affected by the following non-random errors:
Humidity Errors: eHla =0 Static Pressure Effects: eSPla = 0 ePla =0 ;
Ambient Pressure Errors: '
Power Supply Effects: eVla =0 Drift: eDia =0 11.4.4 Temperature error (eTin)
The thermocouples are designed to exhibit a precise temperature effect, which is used to develop the signal provided to the loop. Since the thermocouples are designed to function in temperatures well above the system design temperature, there is no temperature error other than the accuracy error. Therefore, eTla = 0 REVISION NO. O
Exhibit E NEP-12-02 RIvision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 17 of 30 11.4.5 Non-random error, Accident Operating Conditions Zela = eHla + eRia + eSla + eSPla + ePla + eVla + eDla
+ eTla + eIR1a
=0+0+0+0+0+0+0+0+0 Eela = i 0*F I
l REVISION NO. O
I Exhibit E NEP-12-02 RIvi:lon 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 18 of 30 11.5 TEMPERATURE SWITCH ERRORS (MODULE 2) 1 The temperature switch has an analog input and a discrete output. j Therefore, it is classified as a bistable module. )
11.5.1 Random Error (a2) 11.5.1.a Reference Accuracy (RA2)
Section 8.2 provides vendor's terms for reference accuracy, repeatability, hysteresis, and conformity. From Section 10.0, the !
calibrated span is 150*F. Per Assumption 5.1, the terms are considered l to be 2a values and will be combined using SRSS. Therefore, RA2 is !
determined as follows: !
)
In general:
RA2 = ((Ref. Acc.)2 + (Repeat.)2 + (Hyster.)2 ,
(Conformity)2]n RA2 = ((0.02 e 150*F)2 + (0.0025 e 150 F)2 + (0.001 e .
150*F)2 + (0.0065 e 150*F)2)n
= i 3.180212'F Per Assumption 5.1, the standard deviation for reference accuracy (RA2g,3 ) is RA2/2, therefore:
l RA2 g,3 = i ( 3 .180212 'F) /2
= 1 1.590106*F 11.5.1.b Calibration Error (CAL 2)
Per Reference 3.4, apply a test voltage to the switch through the resistance decade box while measuring the voltage with a DMM listed in Section 9.0, and recording the temperature at which the switch contact opens.
REVISION NO. O j
f Exhibit E l NEP-12-02 R; vision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 19 of 30 The Calibration Error consists of following errors:
l e DMM Error (MTE2 o ) present at the switch input e Calibration Standard Error (STD) 11.5.1.b.1 Measurement & Test Equipment Error (MTE2)
Determination of DMM error present at the switch input Fluke Model 8500A, (MTE2 g)
Reference accuracy (RAMTE) is equal to the Manufacturer's reference accuracy. For determination of RAMTE, the worst-case reading is that which is the highest value for the calibration limits in the instrument loop (5.067 mVdc). From the data in Sect. 9.0, RAMTE = f(0.005% reading + 8 counts)
= i[ (0. 00005) e (5. 067 mVdc) + 8 (0. 001 mVdc) ]
= i 0.008253 mVdc The standard deviation of reference accuracy (,R AMTE g ,3) is RAMTE/2 (Assumption 5.1). Therefore, RAMTE g ,3 =1 0.008253 mVdc / 2 = 1 0.004127 mVdc The temperature switch is calibrated in the control room which has an ambient temperature range of 73 i 1*F (Reference 3.5).
This temperature range is within the range given by the M&TE vendors where no temperature effect occurs. Therefore, there is no temperature effect for this application.
TEMTE g ,3 =0 REMTE, the reading error is defined as the least significant digit for a digital readout. Therefore, from Section 9.0, REMTE = 1 0.001 mVdc REVISION NO. 0
-)
Exhibit E NEP 12-02 R: vision O COMMONWEALTH EDISON COMPANY l
CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 20 of 30 ,
1 From Reference 3.2, the total measurement error for the calibration instruments listed in Section 9.0 is determined using the following equation:
MTE2, = i[(RAMTE g ,3 + TEMTEg,3)2 + (REMTE) 2] o.5
=i ((0.004127 mV + 0)2 + (0. 001 mV) 2) o.5
= i 0.004246 mV 11.5.1.b.2 Calibration Standard Error (STD2)
The error due to calibration accuracy of calibration equipment is assumed to be negligible (Assumption 5.5). Therefore, STD2 = 0 11.5.1.b.3 Determination of Calibration Error (CAL 2)
CAL 2 = [i(MTE2 o 2 + STD2 )2 ) %
(;t(0.004246 mV)2 + (0)20.5 3
CAL 2 =1 0.004246 mV 11.5.2 Setting Tolerance (ST2)
Per the allowable range tolerance data in Section 10.0, the setting tolerances for the switches are not equally negative and positive. For conservatism and to ease combining error terms, the greater of the two values for the switch will be considered as the setting tolerance. Therefore, ST2 = 1 0.053 mVdc Per Section 2.1, ST2 is considered a 3a value, therefore ST2 g,3 = ST2/3.
ST2 da) =i (0.053 mVdc)/3 = i 0.017667 mVdc REVISION NO. O
Exhibit E NEP-12-02 R villon 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 21 of 30 11.5.3 Random Input Error (ain2n)
The random error present at the input to the switch is due to the thermocouple and was calculated in Section 11.1.6. The scaling conversion is directly proportional due to the linearity of the devices. The value for al determined in Section 11.1.6 is provided in terms of the thermocouple output error. Therefore, ain = oin2n ain2n = i 1.802776*F 11.5.4 Determination of Total Random Errors (02n) 11.5.4.a Total Random Error (o2n)
In order to combine the random error terms, both calibration error and setting tolerance must be converted to degrees Fahrenheit. This is done by applying the error to the setpoint to determine a range, and then using the *F vs mVdc ratio from Design Input 4.3 to find the corresponding temperature change.
CAL 2 = i 0.004246mVdc e (150oF/5.067 mV) = 0.125696*F ST2 = i 0.017667 mVdc e (150*F/5.067 mV) = 0.523002*F 02n = [(RA2)2 + (CAL 2)2 + (ST2)2 + (ain2n)2)n
+ ( 0.12 56 96
- F) 2 + (0.523002*F)2 ,
= i (1.802776*F)
[ (1. 5 90106
- F))2 l
= 1 2.463284oF 11.6 Random Error, Accident Conditions (02a) l The temperature switch is located in a controlled environmental ,
area such that Normal Operating Conditions and Accident Condi- l tions are the same. Therefore, for the purpose of this calculation, since random errors are not dependent on environmental conditions, total random error for normal and accident conditions is assumed to be the same.
11.6.1 Total Random Error For Setpoint Margin Determination (02a) 02a = 02n = i 2.463284*F REVISION NO. O
! Exhibit E j NEP 12-02 l R: vision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 22 of 30 11.7 Non-Random Errors Normal Operating Conditions (Ze2n) 11.7.1 Humidity Error (eH2n)
There are no humidity errors described in the Vendor's specifi-cation for the temperature switch. These errors are assumed to be included in instrument reference accuracy (Assumption 5.2).
Therefore, eH2n =0 11.7.2 Temperature Error (eT2n)
The Vendor does not provide a temperature effect specification.
However, the operating temperature limits for the switch are from 14'F to 140*F. The normal operating ambient temperature at the switch location is 72'F-74'F (Section 8.2.1) which is bounded by the manufacturers specification. Therefore, eT2n =0 11.7.3 Radiation Error (eR2n)
There are no radiation errors described in the Vendor's speci-fication for the temperature switch. These errors are assumed to be included in instrument drift related errors (Assumption 5.6).
Therefore, eR2n =0 11.7.4 Seismic Error (eS2n)
A seismic event defines a particular type of accident condition.
Errors included on the instrument due to seismic vibrations are defined only for accident conditions and therefore, are not applicable during normal plant conditions.
eS2n =0 11.7.5 Static Pressure Offset (ESP 2n)
The temperature switch is an electrical device and as such is not affected by static pressure. Therefore, ESP 2n =0 REVISION NO. O
Exhibit E NEP 1242 R vision 0 COMMONWEALTH EDISON COMPANY l
CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 23 of 30 11.7.6 Pressure Error (eP2n)
The temperature switch is an electrical device and as such is not affected by ambient pressure. Therefore, eP2n = 0 11.7.7 Process Error (ep2n)
There are no process errors associated with the temperature switch. Therefore, ep2n = 0 11.7.8 Power Supply Effects (eV2n) l Per Section 8.2, the power supply effects are as follows:
eV2n = t[0.5% span] = 1(0.005 e 150*F] l
=1 0.75*F )
1 11.7.9 Temperature Switch Drif t Error (eD2n)
The vendor does not provide a drift specification for the switch I which is an electrical device. Therefore, it is assumed to be O.5% of setpoint per 18 months (Assumption 5.4). The calibration j frequency (SI) is 24 months and the late factor (LF) is 6 months. l Therefore, l l
l eD2n = t (0.5% (setpoint) /18 months) (SI) (1 + LF/SI) I
= f (0.005e (65*F) /18 months) (24 months) (1 + 6/24) i
=1 0.541667*F 11.7.10 Non-Random Input Error (ein2n)
The non-random input error is due to the thermocouple and was calculated in Section 11.3.4.
Zeln = ein2n = 0*F l
l REVISION NO. 0 1
1
ExhiWt E NEP-12-02 R; vision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208lPROJECTNO. N/A PAGE 24 of 30 11.7.11 Total Non-Random Error Normal Operating Conditions (Ee2n)
Ze2n = eH2n + eT2n + eR2n + eS2n + ESP 2n + eP2n + ep2n +
eV2n + eD2n + ein2n Ee2n = 0 + 0 + 0 + 0 + 0 + 0 i 0.75*F + 0 i 0.541667*F +
0
= i 1.291667*F 11.8 Non-Random Error, Accident Conditions (Ee2a) 11.8.1 Humidity Error (eH2a) 1 There are no humidity errors described in the Vendor's specifi- '
cation for the temperature switch. These errors are assumed to be included in instrument reference accuracy (Assumption 5.2).
Therefore, eH2a =0 11.8.2 Temperature Error (eT2a)
The Vendor does not provide a temperature effect specification.
However, the operating temperature limits for the switch are from 14*F to 140*F. The operating ambient temperature at the switch location is 72*F-74*F (Section 8.2.1). Therefore, eT2a =0 11.8.3 Radiation Error (eR2a)
There are no radiation errors described in the Vendor's speci-fication for the temperature switch. These errors are assumed to be included in instrument drift related errors (Assumption 5.6).
Therefore, eR2a =0 11.8.4 Seismic Error (eS2a)
The switch is seismically qualified and the vendor did not include any error due to a seismic event (section 8.2.1). l Therefore, eS2a =0 l
l I
REVISION NO. O
i ExhiWt E I NEP-12-02 R0 vision 0 COMMONWEALTH EDISON COMPANY l
CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 25 of 30 11.8.5 Static Pressure Offset (ESP 2a)
The temperature switch is an electrical device and as such is not affected by static pressure. Therefore, ESP 2a =0 11.8.6 Pressure' Error (eP2a)
The temperature switch is an electrical device and as such is not affected by ambient pressure. Therefore, eP2a = 0 11.8.7 Process Error (ep2a)
There are no process errors associated with the temperature switch. Therefore, ep2a = 0 l
11.8.8 Power Supply Effects (eV2a)
Per Section 8.2, the power supply effects are as follows:
eV2a = i[0.5% span] = 1(0.005 e 150*F]
= 1 0.75'F 11.8.9 Drif t Error (eD2a)
The drift error is calculated in Section 11.7.10 for normal conditions, and is the same for eccident conditions since drift is not dependent on the environment:
e2Dn = e2Da = 1 0.541667'F 11.8.10 Non-Random Input Error (ein2a)
The non-random input error is due to the thermocouple and was calculated in Section 11.4.5, and is used as input to the switch:
Eela = ein2a = 0'F REVISION NO. O
l Exhibit E NEP-1242 l Revision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 26 of 30 11.8.11 Total Non-Random Error Accident Operating Conditions (Ze2a)
Ze2a = eH2a + eT2a + eR2a + eS2a + ESP 2a + eP2a + ep2a + eV2a +
eD2a + ein2a Ze2a = 0 + 0 + 0 + 0 + 0 + 0 + 0 1 0.75'F i 0.541667'F i O'F
= 1 1.291667*F I
1 l
REVISION NO. O
Exhibit E '
, NEP 1242 R; vision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 27 of 30 12.0 TOTAL ERROR NORMAL OPERATING AND ACCIDENT CONDITIONS (TE) l The total error is determined as follows:
TE = 2e (02) + Ee2 12.1 Total Error, Normal Operating Conditions (TE2n)
From Section 11.5.4.a, 02n = i 2.463284 *F From Section 11.7.12, Ee2n - i 1.291667'F ten =i (2 e 2.463284*F) i 1.291667 F
= 1 6.218235'F )
12.2 Total Error, Accident Operating Conditions (TE2a)
From Section 11.6.1, 02a = 1 2.463284 oF From Section 11.8.12, Ee2a = i 1.291667'F tea =i (2 e 2.463284*F) i 1.291667*F
= 1 6.218235'F l
l I
REVISION NO. O
Exhibit E NEP 12-02 Revision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 28 of 30 13.0 DETERMINATION OF THE NOMINAL TRIP SETPOINT 13.1 Analytical Limit (AL)
From Section 10.0, AL = 72.5*F 13.2 Setpoint Margin (MAR)
For determining new nominal trip setpoints, margin is defined as 0.5% of process measured span.
MAR = 0.5% e 150 F
= 0.75'F 13.3 Determination of Nominal Trip Setpoint NTSP = AL - (tea + MAR)
= 72.5*F - (6.218235*F + 0.75'F)
= 65.531765'F REVISION NO. O I
Exhibit E NEP 12-02 l Ralsl:n 0 '
COMMONWEALTH EDISON COMPANY !
l CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 29 of 30 <
l 13.4 Allowable Value The allowable value for actuation on an increasing parameter is l given by: l l
For this calculation, the error term for calculation of the allowable value will include only the normal error terms for the temperature switch because the thermocouple is not part of the switch calibration process. Therefore:
1 02n = [(RA2)2 + (CAL 2)2 + (ST2)2]w
= i[(1.590106*F)2 + (0.125696 F)2 + (0.523002 F)2)w
= i 1.678621*F From Section 11.7.11:
Ze2n = i 1.291667*F Total error is determined as follows:
TE = 2e(o2n) + Ee2n
= 2e(1.678621*F) + 1.291667*F
= 4.648909*F AV = 65.531765*F + 4.648909*F l
= 70.180674*F j
~ 70.1*F i
l l
REVISION NO. 0 l
Exhibit E NEP 12-02 R vision 0 COMMONWEALTH EDISON COMPANY CALCULATION NO. NED-I-EIC-0208 PROJECT NO. N/A PAGE 30 of 30 14.0 Conclusions 14.1 Nominal Trip Setpoint This calculation determines a nominal trip setpoint for the Main Steam Tunnel Temperature Isolation Setpoint that ensures a high level of confidence that the Analytical Limit will not be exceeded under normal or accident operating conditions.
1 Recommended Nominal Trip setpoint s 65.6*F i 14.2 Allowable Value The recommended Allowable Values is s 70.1*F l
l REVISION NO. O
- z. - .- .i gn.. .w.n ,
(Att. l.D. Jnt f OL J k 3 Ca!c, Ne4_4.:.6.AeJ.,R.w.,J. __.].
=- ,, : n ,
Electn. cal / I&C Engineenng i l
Record of Telephone Conversation j Date: January 16,1996 l
With: Pete VandeVisse, Comed NES Pete Wicyk, Comed NES Dean Crumpacker, Comed NES Tom VanWyk, LaSalle Site Design Engineering ,
Jose Casillas, GE SanJose, Nuclear Energy Dept (408-925-6910) f Kaz Utsumi, GE SanJose, Nuclear Energy Dept (408-925-3707) l l
Subject:
Riley model 86 Temp-Matic Thermocouple Monitor Accuracy Conversation:
The Riley vendor manual for this model switch indicates that it may be used in applications with a maximum signal loop resistance of 500 Q. The LaSalle application for the Main Steam
%nnel Temperature Isolation Setpoint uses loop resistance of 500-10000. Comed asked GE whether a loop resistance greater than 5000 would effect the reference accuracy of the Temp-Matic.
GE responded that loop accuracies up to 10000 were acceptable, and that the associated reference accuracy, used in the GE methodology, was 2% of span. This reference accuracy was applicable provided that the loop resistance was calibrated out of the thermocouple channel calibration. NOTE: LaSalle calibration procedures are performed with a decade box substituting for the thermocouple during calibration, which removes the loop resistance from the calibration error.
Jose Casillas agreed to provide a letter to Comed by 1/17/95 documenting the reference accuracy of the Riley model 86 thermocouple monitor as discussed above.