ML17265A154

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Rev 1 to DA EE-92-089-21, Design Analysis Ginna Station Instrument Loop Performance Evaluation & Setpoint Verification.
ML17265A154
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Site: Ginna Constellation icon.png
Issue date: 09/16/1997
From: Randy Baker
ROCHESTER GAS & ELECTRIC CORP.
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ML17265A155 List:
References
DA-EE-92-089-21, DA-EE-92-89-21, NUDOCS 9802120053
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Text

Design Analysis Ginna Station Instrument Loop Performance Evaluation and Setpoint Verification Instrument Loop Number ( SG F464 )

Rochester Gas and Electric Corporation 89 East Avenue Rochester, New York 14649 DA EE-92-089-21 Revision~

( September 15, 1997 )

EWR 5126 Prepared by:

Design Engineer Date Reviewed by:

Independent Reviewer Date TECHNICAL INPUT FORM EIN FE 464 I FT 464 I FQ 464 g FC 464Ag FM 464AI FM 464B g FM 464C g FI 464 g FE 465 I FT 465 g FQ 465 / FC 4645 I FM 465AI FM 465B / FM 465CJ FI 465 ~

FE-474, FT-474, FQ-474/ FC 474AI FM 474Ag FM 474BI FM 474CI FI 474 g FE-475, FT-475, FQ-475/ FC 475Ag FM 475A~ FM 475B~ FM 475cg FI 475 KEYWORDS Instrument, Set oint, Uncertaint , Main Steam Flow CROSS REF CPI FLO 464'PI FT 464'PI FLO 465'PI FT 465 I CPI FLO 474@ CPI FT 474'PI FLO 475'PI FT 475'R 97 1174 PSSL 05 EWR/ 5126 PROPRIETARY YES NO OTHER COMMENT SUPERSEDES 98021200 53 98020b PDR ADQCK 05000244 P PDR Page 1 of 52

REVISION STATUS SHEET evision Affected N/A Original 1.1, 1.2, 5.1.1, Resolution of PCAQs 94-67,94-068 and ACTION Report 97-1174; Delete Attachments Ag Bg Cg and D 2.0, 9.9, 10.1, 11.0, Attachment 1 EWR 5126 Design Analysis DA EE-92-089-21 Page 2 of 52 Revision ~

INSTRUMENT PERFORMANCE EVALUATION AND SETPOINT VERIFICATION TABLE OF CONTENTS Section Title Page Instrument Loop Identification . . . . . . . . . . . . . . . . 1 1 .0 Purpose ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ e ~ ~ ~ ~ ~ ~ 5 2.0 References 5 3.0 Assumptz.ons 9 4.0 Block Diagram and Scope of Analysis C

5.0 Instrument Loop Performance Requirements . . . . . . . . . . . 14 6.0 Description of the Existing Instrument Loop Configuration 19 7.0 Evaluation of Existing Instrument Loop Configuration Against Documented Performance Requirements 22 Documentation of Loop Uncertainties 25 Loop Uncertainty Evaluation 35 10.0 Setpoint Evaluations 48 11.0 Conclusion 50 Attachment 1 52 EWR 5126 Design Analysis

.DA EE-92-089-21 Page 3 of 52 Revision ~

Instrument Loop Identification Calibration Procedure

~ ~

No.

==

Description:==

The Instrument Performance Evaluation and Setpoint Verification of the following equipment will be performed by this document:

i.

2 ~

3.

4 ~

5.

6.

7 ~

8.

9.

EWR 5126 Design Analysis DA EE-92-089-21 Page 4 of 52 Revision ~

1.O Purpose The purpose of this calculation is to determine the overall loop uncertainty associated with main steamline A flow measurement channel F-464. This loop provides safety-related main steam flow indication at the main control board for both normal and post-accident conditions, inputs to the ESF actuation circuitry for steamline isolation, and provides non-safety related input to the advanced digital feedwater control system, PPCS, and flow recorder FR-464. The safety-related portion of this loop is comprised of the venturi flow element, differential pressure transmitter, power supply, alarm bistable, multiplier/divider (which also receives an input from steam generator A pressure loop P468), square root extractor, current repeater, and the control room indicator. This portion of the process loop is the subject of this analysis.

1' Revision 1 of this analysis is for resolution of PCAQs94-067 and 94-068. This revision does not affect original Attachments A, B, and C, therefore, they are not reproduced in this revision. See Revision 0 for Attachments A, B, and C. Main Steam flow instrument loops F465, F474 and F475 are equivalent to loop F464 therefore, this analysis is applicable to loops F465, F474 and F475 as well.

2.0 References UFSAR Table 7.5-1, "Regulatory Guide 1.97 Revision 3/NUREG-0737 Comparison Table".

2. Regulatory Guide 1.97, "Instrumentation for Light Water-Cooled Nuclear Plants to Assess Plant and Environs Conditions During and Following an Accident", (Rev. 3, Dated May, 1983).
3. Improved Technical Specifications, R.E. Ginna Nuclear Power Plant Table 3.3.1-1 Reactor Trip System Instrumentation Table 3.3.2-1 ESFAS Instrumentation Table 3.3.3-1 Accident Monitoring Instrumentation 4 ~ Calibration Procedure CPI-FT-464, "Calibration of Steam Generator A Steam Flow Transmitter FT-464".
5. Calibration Procedure CPI-FL0-464, "Calibration of Steam Generator A Steam Flow Loop 464 Rack Instrumentation".
6. Steam Generator A Steam Flow Loop FT-464 Instrument loop Wiring Diagram, Drawing No. 11302-0364, Sheet 1.
7. 65P Panel-Mounted Indicating Milliammeters and Voltmeters, Product Specifications, PSS 2A-3B1 A, The Foxboro Co., Dated 1982.
s. Test Report of Seismic Vibration Testing of Specific Foxboro EWR 5126 Design Analysis DA EE-92-089-21 Page 5 of 52 Revision ~

Instruments, Dept. 383, Test Report No. TI-1070A, Dated 6/25/74.

TICP-3, Category II Pneumatic Calibrators, Rev. 11.

Guidelines for Instrument Loop Performance Evaluation and Setpoint Verification, Rev. 1.

ll. Main Steam F464 Block Diagram.

12. Precalculation Instrument Review Checklist for Instrument Loop MS F464, Dated 7/05/94.
13. RG&E Drawing No. 03023-018, "Environmental Qualification of Class 1E Equipment FT 464".
14. Memo from Gary A. Cain to Mr. Baker, "Request for letter stating calibration accuracies of Digital Multifunction Meters", Dated March 29, 1990.
15. TICP-4, Category II, Digital Multifunction Meter, Rev. 11.
16. RG&E UFSAR Tables:

3 '1-1 Environmental Service Conditions for Equipment Designed to Mitigate Design Basis Events.

7~2 1 List for Reactor Trip, ESF Actuation, and Containment Isolation.

7. 4-2 Safe Shutdown Instruments.

EOP Setpoint Database.

18. RG&E Dwg. No. 33013-1363, Sheet 6, "Logic Diagram Safeguarads Actuation Signals."
19. Foxboro Drawing No. CD-11, Interconnection Wiring Diagram Rack SD, Reactor Protection System, Sheet 2 of 3.
20. Main Steam P&ID, Drawing No. 33013-1231.
21. Foxboro Drawing No. CD-3, Interconnection Wiring Diagram Rack R-2, Reactor Protection System, Sheet 1 of 3.
22. Special Instruction G-3645, "Model 63S Rack Mounted Alarms Style A", The Foxboro Co., Dated 4/68.
23. Model 66A Square Root Converter, The Foxboro Co., Dated 3/67.
24. General Specifications, 66B Series Electronic Consotrol Current Repeater, GS 2A-2D1 A, The Foxboro Co., Dated 5/81.
25. Seismic Vibration Test of Specific "H" Line Instrumentation, The Foxboro Co., Dated 8/26/75.
26. Product Specifications "N-Ell and N-E13 Series d/p Nuclear EWR 5126 Design Analysis DA EE-92-089-21 Page 6 of 52 Revision ~

Electronic Pressure Transmitters", PSS 9-1B1 A, The Foxboro Co.,

Dated 87.

Foxboro Report QOAAC10, Rev. A, "Test Plan and Test Procedures for Class 1E Qualification of N-E10 Series Transmitters".

28. Steam Generator A Pressure Loop PT-468 Instrument loop Wiring Diagram, Drawing No. 11302-0368, Sheet 1 and Sheet 2.
29. Deleted
30. Precalculation Instrument Review Checklist for Instrument Loop SG P468, Dated 4/4/94.
31. Calibration Procedure CPI-PT-468, "Calibration of Steam Generator A Steam Pressure Transmitter PT-468".
32. Calibration Procedure CPI-PRESS-468, "Calibration of Steam Generator A Steam Pressure Loop 468 Rack Instrumentation".
33. Integrated System Performance Analysis SG 1A, Steam Flow FT-464, Dated 10/24/90.

3 4'. Foxboro General Specification, GS2A-5E2 A for Model 66D Series Electronic Consotrol Multiplier/Divider, Faxed information from Matt Griffin of the Foxboro Co., Dated 2/20/94.

Performance Test, Code, ANSI/ASME PTC Interim Supplement 19.5 on Instrument and Apparatus, Application, Part II of Fluid Meters,

'7. Sixth Edition-1971.

Hydraulic Institute Standards Centrifugal, Rotary and Reciprocating Pumps, 13'd. Centrifugal Pump Test Code.

38. Telecon with Fred Buse (Ingersol Rand-Dresser, Allentown N.J.)

Chairman, Hydraulic Institute Test Standard Committee by George Daniels, Dated 11/10/92.

39. Westinghouse Letter, To R. Baker, ADFCS Steam Flow Compensation, Dated 1/08/91.
40. Main Steam Inside Containment (EWR 2512), Drawing No. C-381-350, Sheet 1.
41. ITT Controls, Drawing No. T3B4DC2DD184910, Flow Venturi, Change No. 2.
42. Controlled Vender Manual, Vl.01-002, Book No. 1893, Type 66D Multiplier-Divider, The Foxboro Co.
43. Westinghouse Nuclear Energy Systems, Manual No. W-1001-s, FE-464 and FE-474, Received 2/24/70.

EWR 5126 Design Analysis DA EE-92-089-21 Page 7 of 52 Revision ~

44. Foxboro Product Specification PSS 2A-1Cl H for E13-DH, Foxboro Co., dated 1981.
45. Methodologies for the Determination of Setpoints for Nuclear Safety-Related Instrumentation, ISA-RP67.04, Part II.
46. Error analysis by George Daniels concerning density compensation, Dated 7/05/94.
47. Westinghouse correspondence NSD-SAE-ESI-97-513 from R.H.Owoc to R.Eliasz, dated 9/11/97.

EWR 5126 Design Analysis DA EE-92-089-21 Page 8 of 52 Revision ~

Assumptions The following inaccuracies for each component were assumed:

Transmitter FT-464 drift .254 for 12 months was specified in Ref. 26; 0.54 will be used for an 18 month .

interval.

Indicator FI-464 readability 1/2 subdivision (Reference 10 Section 10.5.2.3) 1/2 (.1X10 MPPH) or 1.324 Full Scale Rack equipment temperature effect is negligible Combined Rack drift 1.04 (F.S.) for 18 months Test Points TP/464, TP/464A and TP/468 resistor tolerances are

+1.04 LuD 'R FT-464: The drift, term of .54 for 18 months is conservative based on industry experience and the fact drift is not a linear function, accumulating most of the term in the first few weeks following calibration.

FI-464: Refer to Reference 10, Section 10.5.2.3; readability has been selected from the guidance provided in this section.

Temperature effect is considered negligible since rack components are located in the main control room and relay room which are controlled environments.

Combined Rack drift effect is based on similar equipment specifications and on sound engineering judgement.

Test resistor tolerance of +1.0% is based on sound engineering judgement and previous experience.

2. Normal ambient temperature in the Containment Building is 90'F.

RR:~~K:

This basis represents the mid-point of the design temperature of the Containment Building, 60'F 120'F (90'F + 30'F).

3. Assume the power supply effect is negligible.

2'mim.

Refer to Reference 26. The transmitter operates within stated limits of performance specifications for the variations in voltage supply. Based on similar equipment specifications and on sound engineering judgement, the power supply effect is considered negligible; For the same reason, resistive elements EWR 5126 Design Analysis DA EE-92-089-21 Page 9 of 52 Revision ~

in modules, and conductors have negligible effect on loop accuracy as long as the load is within the range specified for the transmitter and power supply.

4. The temperature effect on the test, point resistors is negligible.

RED 'l fl The test point resistors are located in the Relay Room which is a controlled environment. The normal temperature in the relay room is 70'F to 78'F; therefore, any change in resistance due to temperature is insignificant.

EWR 5126 Design Analysis DA EE-92-089-21 Page 10 of 52 Revision ~

400 Block Diagram and Scope of Analysis Ref; Precalculation Instrument Review Checklist Block Diagram for Steam Generator Instrument Loop F464.

CESC YENTIPV TUSE DES'IIR SVPPLY DESC:VERT. SCALE PCI.

LPO:VIESTNOHOVIC 4$ 4 Mf0: FOXPCR0 1450 MA. 45 ~ LPPH MCCEV SH IIN45 MODEL 4 I OATOH MFO'IFOXSORO MODEL! 55PA5V554V 1 PAN FT FM 4M 4$ 4 4$ 4 A

DESC: IAATPLEA OE$ C $ 0 RT,EXTRACT DESC: REPEAIER MFG:FOXSORO f

MFO; OXSOR 0 Mf0,'OXSOR 0 OESC Off, PRESS 'I RXHSIRT I ER MODEL'. NERO HI MOCEL: M<<ROIPI MODEL: IISROH H 50 HA 0 151 I N'0 MF0.'OISCR0 PI $ 0 IRI. STM. PRESS.

MODEL'HEIICMHOIOE 1050 RIA, 0 1400 PSIO MAHSTEAl ISOLATION HI STEAM fLOWAND LO T AVO (<<54$ DEC. F)

FC 4$ 4 OA MPPH (I 044 PR9 A Ss MPPH H5J IRAI MAHSTEMI ISOLATON OESC ALFRM I<<FO; FOIOOR 0 f

HHIISTEFM LOW MOOTL: MSORODHA fM 4$ l D

DESC REPEATER MFO.fOXSORO MODEL'SROH LEOTHD

'DEVCE MAYHOT AFFECT LODPACCVRACY SCOPE SOVHOARY DE5RCE DVTPUT LS NOT WITHPI THE SCOPE Of ANALYSO MAINSTEAMF464 BLOCK DIAGRAM MSFSSS.DWCP Figure 1 EWR 5126 Design Analysis DA EE-92-089-21 Page 11 of 52 Revision ~

4.1 Description of Functions Making reference to the Block Diagram, describe the instrument loop functions that are within the scope of the analysis using the format below.

4 ~ 1.1 Protection This loop provides input to the ESF steam line isolation logic as follows:

Upon dual alarm bistable FC-464A sensing current corresponding to a steam flow of 0.4 X 10 pph 9 755 psig (approximately 12.14 of rated power) a high steam flow signal is generated. This signal satisfies a two input "OR" gate, and along with a signal from the low T,~ interlock, provides the two inputs to a two input "AND" gate. With a high steam flow input and the T,> interlock enabled (two-out-of-four T~ s545), a signal xs generated through the "AND" gate. This signal will satisfy a two input "OR" gate, and serves as one of the two inputs to a two input "AND" gate. The other input to the "AND" gate is provided by the safeguards sequence actuation signal. With the safeguard sequence signal enabled and FC-464A sensing a high flow condition, a signal is generated through the "AND" gate and subsequent "OR" gate initiating a signal to cause a steamline isolation of loop A.

If steam flow increases above 3.6 X 10'ph 9 755 psig (approximately 109.1% of rated power), the second setpoint of dual alarm bistable FC-464A will be reached causing a High-High steam flow signal to be generated. This logic is similar to the above logic with the exception that a low T,q condition is not necessary to satisfy the above logic.

However, the safeguards sequence signal is still required to generate an initiation signal that will cause a steamline isolation of loop A.

4 ~ 1 2

~ Control This loop does not perform any safety-related control functions. However, this loop provides an input to the advanced feedwater control system which automatically maintains steam generator level within a programmed band during power operations.

4 1~3 Indication Instrument loop F464 provides control room indication (FI-464) of main steam flow (loop A) during both normal and post-accident conditions to control room operating personnel. This function of the instrument loop is safety-related, and hence, included in this analysis.

EWR 5126 Design Analysis DA EE-92-089-21 Page 12 of 52 Revision ~

Non safety-related alarms and status lights associated with this instrument loop are as follow:

S/G A Hi Steam Flow (Upon activation of either setpoint of FC-464A)

Hi Steam Flow Line A FC-464A (.4 X 10 pph 9 755 psig)

Hi-Hi Steam Flow Line A FC-464A (3.6 X 10 pph 9 755 psig)

EWR 5126 Design Analysis DA EE-92-089-21 Page 13 of 52 Revision ~

0 5.0 Instrument Loop Performance Requirements 5.1 Documenting the Design Requirements for Monitoring the Process Parameter 5~1 1 Identify Performance Related Design Bases Associated With the Instrument Loop:

Safety Classification (SR/SS/NS) as documented in the Ginna Q-list.

NUREG 0737/RG 1.97 as documented in Table 7.5-1, of the Ginna UFSAR.

UFSAR Table 7.5-1 lists the Main Steam flow loop FT-464 as an NRC Category 2, Type D variable. Type D variables are those variables that provide information to indicate the operation of individual safety systems and other systems important to safety. These variables are to help the operators make appropriate decisions in using the individual systems important to safety in mitigating the consequences of an accident. Category 2 variables require reliable power, seismic and nuclear qualification (if required), as stated in Table 1 "Design and Qualification Criteria for Instrumentation" of Regulatory Guide 1.97.

EQ ( per the 10 CFR 50.49 list )

Pressure transmitter FT-464 is identified as requiring environmental qualification in the EQ Master List found in Appendix E of the Quality Assurance Manual. The pressure transmitter has been environmentally qualified through a Foxboro Qualification test program (Reference 27).

Seismic Category Integrity Only /

( Seismic Class NS )

I/ Structural The seismic requirements for a R.G. 1.97, Category 2, Type D Variable are specified to be in accordance with R.G. 1.100 (ZEEE-344). The instrumentation for this loop are Foxboro nuclear grade components and have been seismically qualified (Reference 8, 25, 27).

Technical Specifications As identified by a review of Tables'.3.1-1, 3.3.2-1, and 3.3.3-1, of the Technical Specifications, this instrument channel is Tech. Spec. related. This flow channel is identified in Table 3.3.2-1 as ESF Actuation Instrumentation, and as such, is required to be operable whenever reactor coolant temperature is >350'F EWR 5126 Design Analysis DA EE-92-089-21 Page 14 of 52 Revision ~

with the main steam isolation valves open. Also, this table identifies operator actions to be implemented during limited operability of required instrument channels.

Table 3.3.2-1 identifies the setpoints and allowable values of the following safety functions:

High Steam Flow, dp corresponding dp corresponding coincident with Low to s0.4 X 10 pph to s0.55 X 10 pph (Changed to see Ref. 47 and

.66x10'ph; Attachment 1)

T,~ and SI 6755 psig;T~ a 545'F 6755 psig;T,~ a 543'F (Changed to 1005 psig; see Ref. 47 and Attachment 1)

High - High Flow, dp corresponding dp corresponding coincident with SI to s3.6 X 10'ph to s3.7 X 10 pph 8755 psig 6 755 psig UPSAR Per a review of Tables 7.2-1 and 7.4-2 of the UFSAR, Table 7.2-1 identifies this loop as having input to ESF actuation for steamline isolation (See Section 4.1.1 for a logic discussion).

EOP Per a Review of the Emergency Operating Procedures Setpoint Database, the EOP setpoints associated with main steam flow rate are listed below:

L.7 3.6 X 10 High-High steam flow for automatic steam line isolation. This setpoint is used to identify that steam line isolation conditions have occurred.

L.S 0.4 X 10 The high steam line flow setpoint for main steam line isolation. This setpoint is used in coincidence with low T,, to determine if steamline conditions have occurred.

EWR 5126 Design Analysis DA EE-92-089-21 Page 15 of 52 Revision ~

5~1~2 Description of Process Parameter:

Under normal conditions: Reference 16, Table 5.4-2 Temperature: 556 F T>>

514'F Full Load Pressure:

Flow: 3.29 X 10 h 770 si Under test conditions:

Same as normal conditions.

Under accident conditions, including which accidents:

Main Steam Rupture.

Temperature: c561 F

  • Pressure: c1140 si
  • Flow: e e te es e
  • Maximum lift setpoint and corresponding of the saturation main steam temperature.

safety valves 5 ~ 1.3 Description of Limits The limits of process control associated with this measured parameter are discussed and evaluated in Section 10.2.

5.2 Documenting the Environmental Conditions Associated With the Process Parameter 5 ' ' Identification of the Sensor Location:

Containment Building, Upper Level, near elevator.

5 2 2 Description of Environmental Service Conditions for the Sensor:

5 2 ' 1 Normal 5~2~2~1~1 Normal Operation, Inside Containment Reference f16 UFSAR Table 3.11-1.

Temperature: 60F to 120F Pressure: Atmospheric Humidity: 60> Nominal Radiation: Less than 1 rad/hr general. Can be higher or lower near specific components.

5~2~2~1 2 During Calibration Same as Normal Operation above.

EWR 5126 Design Analysis DA EE-92-089-21 Page 16 of 52 Revision ~

5.2.2.2 Accident, (LOCA) Inside Containment Reference g16 UFSAR Table 3.11-1.

Temperature: Figure 6.1-2 (286 F maximum)

Pressure: Figure 6.1-1 (60 psig maximum)

Humidity: 10.0>o Radiation: Tables 3.11-2 and 3.11-3; 1.43X10 rads gamma

2. 07X10 rads beta Flooding: 7-ft (approximately) maximum submergence elevation is 242 ft 8 in.

5~2~3 Identification of Other Components Locations:

Reference Procedure No. CPI-FLO-464 Lum~~m FC-464A Alarm Bistable Control Room, Reactor Protection Channel 1, Rack R2.

FM-464A Multiplier/ Control Room, Reactor Protection Divider Channel 1, Rack R2.

FM-464B Sqrt Extractor Control Room, Reactor Protection Channel 1, Rack R2.

FM-464C Current Repeater Control Room, Reactor Protection Channel 1, Rack R2.

FI-464 Indicator Control Room, MCB, Front Center Section.

5.2 ~ 4 Description of Environmental Service Conditions for Other Components:

5.2.4.1 Normal 5.2.4.1.1 Normal Operation, Main Control Room, Relay Room Reference g16 UFSAR Table 3.11-1.

Temperature: 50 F to 104'F Pressure: Atmospheric Humidity: 60% Nominal Radiation: Negligible 5.2.4.1.2 During Calibration Same as Normal Operation Above.

EWR 5126 Design Analysis DA EE-92-089-21 Page 17 of 52 Revision ~

5.2.4.2

~ ~ Accident, Main Control

~ ~

Room Reference g1'6 UFSAR Table 3.11-1.

Temperature: Less than 104'F Pressure: Atmospheric Humidity: 60> Nominal Radiation: Negligible Flooding N/A EWR 5126 Design Analysis DA EE-92-089-21 Page 18 of 52 Revision ~

6.0 Description of the Existing Instrument Loop Configuration 6.1 Summary of Process Measurement 6.1.1 Primary Element Information Manufacturer/Model No.

Size Specifications Ref. Section Piping Configuration/Element Description The venturi flow measurement device is located in the containment building, installed horizontally inline with the 30" main steam piping leaving the steam generator at elevation 314.651'.

Ref. Section 6 1' Sensor Information - Tag No. FT-464 6.1.2.1 Manufacturer/Model No. 0 0 0 Ref.~ Section

6. 1.2.2

~ ~ ~ Sensor Range 80 t Ref. Sec.

Sensor Span Ref . Sec.

6 1 ' Sensor Environmental Limits:

Description of Limits:

Press.

to Ref. Sec. ~~

~~

~~

Ref .

~~

Temp. 0 420 F Sec.

Radiation 2x10 R TID Ref. Sec.

Humidity Ref. Sec.

6~1~ 4 Associated Equipment. Environmental Limits:

Reference the Appropriate EQ Block Diagram EQ Block Diagram:

EWR 5126 Design Analysis DA EE-92-089-21 Page 19 of 52 Revision ~

6.2 Summary of Signal Conditioning and Output Devices:

6.2 ~ 1 Signal Conditioning/Output Device Information:

6~2 1~1

6. 2. 1. 2 ~ac~

6 0 6 0-0-5 0-5

-464 10-50mA 0 3.8 X 10 h 6.3 Scaling 6 ~ 3.1 Performing the Conversions:

FT-464 converts 0-959.5 inches of differential water pressure on the sensing diaphragm of the flow transmitter into a 10-50mA output signal. Since the flow rate and density of the process fluid (steam) both affect the differential pressure created across the venturi flow element, the transmitter's output (to indicator FI-464) is density compensated using an input from steam generator pressure loop P468. FM-464A performs this compensation using a straight line approximation of the relationship between steam pressure and fluid density (the error

'ssociated with this approximation is discussed in section 8.5). FM-464A receives input from flow transmitter FT-464 and pressure transmitter PT-468 to produce a density compensated current output as follows:

Iout = oH* ( 1 ~ 876*+oP ~ 0133 ) *40 + 10 where: I OU't = Current out of FM-464A.

>oH = Percent full Scale Current Input from FT-464 to FM-464A.

9p = Percent full Scale Current Input from P468 to FM-464A.

Since flow is proportional to the square root of differential pressure, FM-464B converts the 10-50 mA input signal from the multiplier/divider, FM-464A, into an output signal which is a square root function of the input signal.

FM-464C serves as an isolator for the output of the square root converter and as input to flow indicator FI-464. FI-464 converts the 10-50 mA signal from current EWR 5126 Design Analysis DA EE-92-089-21 Page 20 of 52 Revision ~

e repeater/isolator FM-464C into a flow indication of 0 3.8 X 10 pph.

Dual Alarm bistable FC-464A senses the 10-50 mA output of flow transmitter FT-464 and actuates at a current of a10.44 mA (corresponding to the differential pressure created by a steam flow of a 0.4 X 10 pph 6 755 psig) for High Flow Steam Line Isolation, and at a45.90 mA (corresponding to the differential pressure created by a steam flow of 3.6 X 10'pph 6755 psig) for a High-High Flow Steam Line Isolation.

See Section 4.1.1 for a detailed explanation of these logic signals.

EWR 5126 Design Analysis DA EE-92-089-21 Page 21 of 52 Revision ~

7e0 Evaluation of Existing Instrument Loop Configuration Against Documented Performance Requirements 7.1 Evaluating the Loop Configuration 7.1.1 Conformance with Design Basis Performance Requirements:

Does the existing design conform to the design basis performance requirements identified in Section 5.1.1 of the checklist?

Explain: The range, location of readout, and classification of the loop are consistent with the design basis requirements for providing both normal and post-accident indication of loop A main steam flow and, to provide safety-related input to the ESF actuation circuitry for steam line A isolation. The power for this loop is supplied by MQ-400A which is powered by class 1E bus f14 and is backed by 125V Vital Battery A this meets Regulatory Guide 1.97 requirements.

Safety Classification SR Reg. 1.97 Yes EQ Yes Seismic Yes Tech. Spec. Yes UFSAR Yes EOP Yes 7~1~2 Performance of Safety Related or Safety Significant Functions:

Can the existing loop adequately perform each of its Safety Related functions (protection, control, and/or indication)?

Explain: The design of this instrument loop is adequate to provide a 0 3.8 X 10 pph flow indication of main steam line A to control room operators during both normal,and post-accident conditions. Additionally, this loop will satisfactorily provide safety-related input to the ESF initiation circuitry.

7 1 3 Evaluating the Consistency of Instrument Loop Documentation Is the loop configuration shown in the calibration procedure(s) consistent with the applicable design drawing(s)? Are component. manufacturers and model numbers documented in the calibration procedure consistent with those shown on applicable design drawings? If significant inconsistencies exist, has reasonable assurance of the actual configuration been established? Have appropriate notifications been made regarding drawing changes?

Explain: The loop configuration shown in the calibration EWR 5126 Design Analysis DA EE-92-089-21 Page 22 of 52 Revision ~

procedure is consistent with the applicable design drawings.

Model numbers have been provided on the Precalculation Instrument Checklist.

7.2 Evaluating the Loop's Measurement Capability 7~2~1 Evaluating the Range/Span:

Is the calibrated span of the sensor and any indication devices (indicators, recorders, computer output points) broad enough to envelope all of the limits in Section 5.1.3 of the checklist?

Explain: The calibrated span of the flow transmitter and indicator is broad enough to envelope the limits and setpoints associated with this instrument loop.

7 ' ' Evaluating the Setpoint and Indicated Values vs. the Span:

Explain: The setpoint evaluation is included with the evaluation of the span/range provided in paragraph 7.2.1 above.

7 2 3 Reviewing the Units of Measure:

Are the units for the indicated values shown within the calibration procedures consistent with the EOPs?

Explain: The operator action points stated in the EOPs are in pounds mass per hour which corresponds with the scale of the control room indicator.

7.3 Evaluating the Calibration 7 ' ' Reviewing the Calibrated Components:

Is every applicable component and output calibrated?

Explain: Procedure CPI-FT-464 and CPI-FLO-464 ensures the calibration of the applicable safety-related components.

7~3 ~2 Reviewing the Primary Element:

Does the calibration of the sensor properly reflect the sizing of the primary element?

Explain: The sensors calibrated span (0 959.5" of H20) properly reflects the differential pressure created by main steam flow rates through venturi tube FE-464.

EWR 5126 Design Analysis DA EE-92-089-21 Page 23 of 52 Revision ~

7 3 3 Reviewing the Direction of Xnterest:

Does the calibration procedure exercise the components in the direction of interest?

Explain: The transmitter and indicator are calibrated both upscale and downscale. The alarm bistable is calibrated upscale for setting and downscale for resetting.

7 ' ' Evaluating the Scaling:

Are the scaling equations and constants described in Section 6.3 and 8.3.1 of this checklist consistent with the existing system performance requirements.

Explain: The scaling equations and factors are consistent with the system performance requirements. See Section 6.3 and 8.3.1 for a more detailed discussion.

7 ' ' Evaluating Calibration Correction Factors:

Describe any calibration corrections used to account for process, environmental, installation effects or for any special design features employed by the instrument. These include corrections within the calibration process for etc. Ensure any effect ~

elevation, static head, density, calibration temperatures, accounted for by the calibration process is included within the determination of the total loop uncertainty (See Section 9.9).

Explain: See Section 8.3 EWR 5126 Design Analysis DA EE-92-089-21 Page 24 of 52 Revision ~

8.0 Documentation of Loop Uncertainties 8.1 Documenting the Components of Sensor Accident Uncertainty (AEUp and AEUs) 8.1.1 Pipe Breaks Transmitter Accident Performance - FT-464 Analysis of environmental qualification test report data on Foxboro transmitters shows significant negative bias during the simulated LOCA exposure. These effects are described and tabulated in Reference 33. Two combination of bias and random error are observed. The effects occurring during the first two hours of LOCA testing at 340'F (Ginna peak is 286'F) are tabulated below as AB, (bias) and Crae, (random error). These errors are considered "worst case" and are used to evaluate the appropriate setpoints. The effects occurring after this, when test temperature is 240'F, are tabulated as AB2 (bias) and Crae2 (random error). These errors can be considered applicable (and conservative) for post accident setpoints not required during the initial (first two hours) accident recovery. Worst case errors are used unless otherwise noted.

Note: The environmental limits for a LOCA envelope the environmental conditions associated with a main steam line rupture, therefore the following uncertainties are conservative.

Accident Effect Uncertainty Reference/Section Tem erature Effect(Te) See Crae, N/A Pressure Effect(Pe) See Crae, N/A Radiation Effect(Re) See Crae, N/A Steam/Chem Spray(S/Ce) See Crae, N/A Accident Bias(AB,) -11.56> Full Scale Reference 33 Combined Random +0.824 Full Scale Reference 33 Accident Effect(Crae,)

(per ZEEE 323 tests)

Accident Bias(AB,) -2.264 Full Scale Reference 33 Combined Random +1.494 Full Scale Reference 33 Accident Effect(Crae~)

(per IEEE 323 tests)

EWR 5126 Design Analysis DA EE-92-089-21 Page 25 of 52 Revision ~

8~1~2 Seismic Event Seismic Effect Uncertainty Reference/Section Pressure Transmitter +1.00> Full Scale Reference 27 FT-464 (Se,,)

Alarm Bistable FC-464A +1.00~ Full Scale Reference 25 (See)

Multiplier/Divider +0.45% Full Scale Reference 8 FM-464A (Se>)

SQRT Extractor +1.00% Full Scale Reference 25 FM-464B (Se,)

Current Repeater +0.20: Full Scale Reference 25 FM-464C (Sel)

Flow Indicator +1.70> Full Scale Reference 8 FI-464 (Seg) 8.2 Documenting the Components of the Accident Current Leakage Effect (CLU)

Associated Equipment Uncertainty Reference/Section Accident Effects Cable Leakage(C1) See Total N/A Splice Leakage(Sl) See Total N/A Penetration Leakage(P1) See Total N/A Term Block Leakage(TBl) See Total N/A Conduit Seal See Total N/A Leakage (CS1)

Total Negligible Reference 33 8.3 Determining the Components of Process Measurement Uncertainty (PMU):

8' ' Documenting the Components of Process Measurement Uncertainty (PMU)

Process measurement uncertainty (PMU) in differential pressure flow measurement arises from several sources; manufacturing tolerances (e.g. dimensional, finish) of the flow element, the installation tolerances (e.g. centering, bore conformity to flow EWR axis), the uncertainty of fluid reference data related to flow 5126 Design Analysis DA EE-92-089-21 Page 26 of 52 Revision ~

(e.g. flow coefficients, viscosity), dimensional tolerances in piping, and uncertainty in flowing fluid state variables (e.g.

temperature, pressure, chemical composition). All of these effects result in flow measurement uncertainties that uniformly increase with flow rate (and differential head) and diminish as the flow rate goes to zero. This contrasts with the uncertainties associated with electronic components in the instrument loop which do not vary with flow rate or go to zero at no flow conditions. However, the net effect on total loop uncertainty is an amplification of the electronic errors at low flow rates due to error propagation through the non linear signal conditioning module (square root extractor). Certain error data is available as it applies to flow rate, while other data is published in a form directly related to head. The flow measurement uncertainty related to primary element (venturi tube) fabrication and installation tolerances is -0.2 + 0.5 percent of indicated full flow, as specified in Reference 43.

It is desirable to directly relate flow errors to head errors.

This is useful for converting errors to a common base so they can be combined. Reference 43 states that an installed error of

-0.2 + 0.5 percent of the "true" discharge coefficient is guaranteed. This is equivalent to a flow error at full flow. To convert the venturi flow error to a head error, the relationship between flow and head is used (Attachment D refer to Section 1.2):

5Q=100* [ (%head+She) /100- %head/100 j Where:

5Q = Flow Error in percent

%head = Percent head developed (ie. at 1004 flow, 100: head is developed)

She = Head Error in percent To obtain random "primary element accuracy (Pea)", in terms of head error, the equation above is solved as follows" g 0.5%=100*[ (100+hhe) /100-~100/100]

~100+hhe-~100=0. 05

@he=1.0% Full Scale EWR 5126 Design Analysis DA EE-92-089-21 Page 27 of 52 Revision ~

Based on elementary fluid mechanics"', the head error due to the various uncertainties in orifice fabrication and installation is given by:

She = constant><10 >Q at other flow rates.

The primary element accuracy can now be expressed in terms of the uncertainty related to head or flow. Other process measurement uncertainties are handled similarly.

(1) For more insight into this equation see Equation 2a of Attachment D, Part I, (see Section 1.2).

(2) See Equation 3 of Attachment D, Part II, (see Section 1.2).

The existing Ginna flow element calibration data is based on a single flow-differential pressure point for each orifice. For FE-464, this point is 3.8 MPPH 9 959.5 "standard"'" inches of water. Flowing fluid temperature effects are discussed below.

Calibration data was then generated using the formula:

where:

Q = Volumetric flow rate (MPPH)

C Constant determined by a single point.

specification (3.8 MPPH, 959.5" 9 755psig) h= Differential pressure in "standard" inches of water Y = Flowing fluid (water) specific weight (ibm/ft )

This calibration methodology is appropriate to the analog instrument loops used at Ginna Station, which provide flow ENR 5126 Design Analysis DA EE-92-089-21 Page 28 of 52 Revision ~

indication based on a single constant multiple of the square root of differential pressure. Since the discharge coefficient is essentially constant over the range of Reynolds numbers which corresponds to flow rates down to about 2 percent, this relation is an accurate model for (venturi tube) flow measurements at constant temperature.

There are certain random and systematic (bias) errors which are directly related to the Ginna calibration data and methodology (and related instrument design). These errors are described below:

The calibration instrument indicates differential pressure in inches of water at 68'F.

a 'o Calibration of the flow transmitter is based on a two point calibration equation (OMPPH, 0"H20; 3.8 MPPH, 959.5" of H,O 9 755psig). The full flow calibration point differs from the flow element data provided by Westinghouse, Reference 43 (3.8 MPPH, 945.5" of H20 9 755psig) . This results in a measurement bias of

-14" of H>O. Therefore:

Pma>> = -1.48*10 *(Q) 8 ' ' Documenting the Components of Process Measurement Uncertainty (PMU)

Effect Head Uncertainty Ref/Section Primary Accuracy Bias -1.48*10 *(Q) Section 8.3.

(Pma,)

Calibration Bias (Pma>>) -0.40*10 '*(Q) Section 8.3 Primary Element +1.PP*1P *(Q) Section 8.3 Accuracy, Random, (PeaR) 8.4 Documenting Measurement and Test Equipment Uncertainty (M&TEU) 8~4~1 Determining Measurement and Test Equipment Uncertainty (M&TEU) 8.4.1.1 Determining the Calibration Uncertainties (M&TEU):

For each component, identify the type of M&TE used for the calibration, the uncertainty attributed to the METE, and the associated reference/section numbers that provided the M&TE information.

~c~tp

~

FT-464 1) One Hewlett-Packard/3466A Multimeter EWR 5126 Design Analysis Revision DA EE-92-089-21 Page 29 of 52

Calibration of digital voltmeters per the requirements of TICP-4 (Reference 15) is +0.1% of input (full scale) plus 1 count (insignificant)

Accuracy = + .14 Full Scale Sce> + .1~ Full Scale FT-464 2) Pneumatic Calibrator, Ametek Model RK1100WC or equivalent, Category II Calibration by the Ametek pneumatic calibrator per the requirements of TICP-3 provides for a tolerance of 2 inches of water for a range up to 1000 inches of water.

(Reference 9)

Accuracy + 2.0" of H,O Sce2 + (2. 0/959. 5) *100% Full Scale Sce2 + 0.214 Full Scale FC-464A 1) One Hewlett-Packard/3466A Multimeter Calibration of digital voltmeters per the requirements of TICP-4 (Reference 15) is +0.1% of input (full scale) plus 1 count (insignificant)

Accuracy = + .14 Full Scale Rce, + .14 Full Scale FM-464A 1) Two Hewlett-Packard/3466A Multimeters Calibration of digital voltmeters per the requirements of TICP-4 (Reference 15) is +0.1~ of input (full scale) plus 1 count (insignificant)

Accuracy + .14 Full Scale Rce2 + .24 Full Scale FM-464B 1) Two Hewlett-Packard/3466A Multimeters Calibration of digital voltmeters per the requirements of TICP-4 (Reference 15) is +0.14 of input (full scale) plus 1 count (insignificant)

Accuracy + .14 Full Scale Rce, + .2~ Full Scale EWR 5'126 Design Analysis DA EE-92-089-21 Page 30 of 52 Revision ~

FM-464C 1) Two Hewlett-Packard/3466A Multimeters Calibration of digital voltmeters per the requirements of TICP-4 (Reference 15) is +0.14 of input (full scale) plus 1 count (insignificant)

Accuracy + .1% Full Scale Rce, + .2% Full Scale FI-464 1) One Hewlett-Packard/3466A Multimeter Calibration of digital voltmeters per the requirements of TICP-4 (Reference 15) is +0.1% of input (full scale) plus 1 count (insignificant)

Accuracy = + .1> Full Scale Rce5 + .1: Full Scale TP/464 1) 10Q Test Resistor TP/464 is used as a calibration point to convert the 10 50 mADC signal from the current generator into a 100 500 mVDC test point for monitoring.

Rce6 =+1.0% Full Scale; Assumption 1 TP/464A 1) 10Q Test Resistor TP/464A is used as a calibration point to convert .the 10 50 mADC signal from the current generator into a 100 500 mVDC test point for monitoring.

Rce, =+1.0< Full Scale; Assumption 1 TP/464B 1) 10Q Test Resistor TP/464B is used as a calibration point to convert the 10 50 mADC signal from the current generator into a 100 500 mVDC test point for monitoring.

Rce, =+1.04 Full Scale; Assumption 1 TP/464C 1) 10Q Test Resistor TP/464C is used as a calibration point to convert the 10 - 50 mADC signal from the current generator into a 100 500 mVDC test point for monitoring.

Rce, =+1.04 Full Scale; Assumption 1 EWR 5126 Design Analysis DA EE-92-089-21 Page 31 of 52 Revision ~

TP/468 1) 100 Test Resistor TP/468 is used as a calibration point to convert the 10 50 mADC signal'rom the current generator into a 100 500 mVDC test point for monitoring.

Rce'yo =+1 '+. Full Scale; Assumption 1 M&TEU Uncertainty Reference/Section Sensor Calibration +Os10>o Full Scale This Calc/Sec 8.4 Effect FT-464 (Sce,)

Sensor Calibration +0.21% Full Scale This Calc/Sec 8.4 Effect FT-464 (Sce,)

Rack Equipment +Os104 Full Scale This Calc/Sec 8.4 Calibration Effect FC-464A (Rce,)

Rack Equipment +0.20~ Full Scale This Calc/Sec 8.4 Calibration Effect FM-464A (Rce,)

Rack Equipment +0.20> Full Scale This Calc/Sec 8.4 Calibration Effect FM-464B (Rce3)

Rack Equipment +Os10~ Full Scale This Calc/Sec 8.4 Calibration Effect FM-464C (Rce4)

Rack Equipment, +0.104 Full Scale This Calc/Sec 8.4 Calibration Effect FI-464 (Rce>)

Rack Equipment +1.00% Full Scale This Calc/Sec 8.4 Calibration Effect TP/464 (Rce,)

Rack Equipment +1.00~ Full Scale This Calc/Sec 8.4 Calibration Effect TP/464A (Rce>)

Rack Equipment +1.00: Full Scale This Calc/Sec 8.4 Calibration Effect TP/464B (Rcea)

Rack Equipment +1.004 Full Scale This Calc/Sec 8.4 Calibration Effect TP/464C (Rce,)

Rack Equipment +1.00~ Full Scale This Calc/Sec 8.4 Calibration Effect TP/468 (Rceyo)

EWR 5126 Design Analysis DA EE-92-089-21 Page 32 of 52 Revision ~

8e5 Documenting Rack Equipment Uncertainty (REU)

REU Uncertainty Reference/Section Rack Equipment Accuracy +0.50% Full Scale Reference 22 FC-464A (Rea>)

Rack Equipment Accuracy +0.50> Full Scale Reference 34 FM-464A (Rea2)

Rack Equipment Accuracy +0.50< Full Scale Reference 23 FM-464B (Rea,)

Rack Equipment Accuracy +0.50> Full Scale Reference 24 FM-464C (Rea,)

Rack Equipment Accuracy +1.50'. Full Scale Reference 7 FI-464 (Rea>)

Rack Temperature Effect Negligible Assumption 1 (Rte)

Rack Power Supply Negligible Assumption 3 Effect (Rpse)

Readability (Rme,) +1 ~ 32+o Full Scale Reference 46 8.6 Documenting Sensor Uncertainty (SU)

Sensor Temperature Effect Ste +1% (~T Design Temp. of Bldg. / 110' [Ref. 27, Assumption 2])

Ste +.01 (30'F / 110'F)

Ste +.27~ Full Scale SU Uncertainty Reference/Section Sensor Accuracy (Sa) +0.655.'ull Scale

  • Reference 26 Sensor Static Pressure +0.274 Full Scale ** Reference 44 Effect (Sspe)

Sensor Temperature +0.27% Full Scale This Calc/Sec 8.6 Effect (Ste)

Sensor Power Supply Negligible Assumption 3 Effect (Spse)

Sensor Miscellaneous N/A N/A Effect (Sme)

  • Includes the effects of reproducibility +e154 and accuracy of +.5~. Note reproducibility includes hysteresis, repeatability, deadband and drift over a one hour period.

EHR DA 5126

'esign Analysis EE-92-089-21 Page 33 of 52 Revision ~

    • Based on a design SG pressure of 1085 psig and a 1.5%

pressure effect corresponding with a pressure variation of 6000 pounds (Ref. 44).

~ ~

8.7

~ Documenting

~

Drift Uncertainty

~ ~

(DU)

DU Uncertainty Reference/Section Sensor Drift(Sd) +0 '0~o Full Scale Assumption 1 Rack Equipment Drift +1.00~ Full Scale Assumption 1 (Red,) Path 1 Rack Equipment Drift +0.254 Full Scale Assumption 1 (Red>) Path 2 Rack Equipment Drift +0.75> Full Scale Assumption 1 (Red,) Path 2 8.8 Documenting Tolerance Uncertainty (TU)

TU Uncertainty Reference/Section Sensor Tolerance Effect +1.00% Full Scale Reference 4 FT-464 (St)

Rack Equipment Tolerance FC-464A (Ret,)

+1 ~ 00~o Ful l Scale Reference 5 Rack Equipment Tolerance +1.004 Full Scale Reference 5 FM-464A (Ret2)

Rack Equipment Tolerance +1.00: Full Scale Reference 5 FM-464B (Ret,)

Rack Equipment Tolerance +1.004 Full Scale Reference 5 PM-464C (Ret<)

Rack Equipment Tolerance +2.004 Full Scale Reference 5 FI-464 (Rets)

EWR 5126 Design Analysis DA EE-92-089-21 Page 34 of 52 Revision ~

9.0 Loop Uncertainty Evaluation Note: The following loop evaluation is performed using uncertainties measured in percent full scale.

e e In evaluating the loop uncertainty for the density compensated main steam line A flow rate indication, evaluate the signal conditioning performed by FM-464A it is necessary to (multiplier/divider) to determine its affect on loop uncertainty.

The signal conditioning performed by this device, as discussed in section 6.3, is shown below:

+o?out: = +oH*(1 876*4P

~ ~ 0133) where: ~I.n~ = Current out of FM-464A.

>oH Percent full scale head input from FT-464 to FM-464A.

Sp Percent full scale pressure input from P468 to FM-464A.

The output uncertainty associated with the above signal conditioning device can be derived using a simplified signal conditioning modeling equation. This is shown below:

C = A(Kg*B + K2) where: Kl and 2 = constants A,B = Variables C = Output as a function of A and B The derivation of the resultant full scale error "c" with input uncertainties "a" and "b" is performed below:

C + c = (A+a)*(K,*(B + b) + K2)

C + c = A*((KyB + Kgb) + K2) + a*((KyB +Kgb) + K2)

Combining terms:

C + c = (AK,B + AK2) + (AK,b + aK,B + aK,b + aK2)

Substituting C for (AK,B + AK2):

C + c = C + (AK b + aK B + aK b + aK2)

Therefore:

c = (AK,b + aK,B + aK>b + aK>)

Note: aK,b is the product of two errors; this term is negligible.

The above equation represents the uncertainty associated with the output of the simplified signal conditioning equation. The EWR 5126 Design Analysis DA EE-92-089-21 Page 35 of 52 Revision ~

uncertainty associated with the output of density compensation module FM-464A is obtained by performing the following substitutions:

A=%H a = 4H, B = %P b=KP, c = Output uncertainty Therefore:

c =Kg (+oH * ~oPo) + AH+ [ (Ky*~oP + K2) ]

where: ~oPo Multiplier input uncertainty from SG pressure loop P468

>oH, Multiplier input uncertainty from SG flow loop F464 Using the SRSS methodology this error equation can be written as:

c =[ (Ky

  • 4H * ~Pe) + +He (Ky
  • oP + K2) ]

By accumulating the errors prior to the multiplier/divider and processing them through the above equation, the corrected uncertainty out of the multiplier/divider is obtained.

The sources of uncertainty in flow rate measurement fall into two categories, with respect to flow rate itself. As discussed in Section 8.3, errors due to primary element fabrication and installation tolerances, and uncertainty in the flowing fluid parameters (Process Measurement Uncertainties) are functions of flow rate. These process measurement errors (PMUs) tend to be significant (and may dominate) the total loop uncertainty at high flows, and become less significant, and finally drive toward zero at very low flows. This contrasts with the uncertainties associated with electronic components in the instrument loop which do not vary with flow rate or go to zero at no flow conditions. The net effect on total loop uncertainty associated with electronic components is an amplification of the electronic errors at low flow rates due to error propagation through the non linear signal conditioning module (square root extractor).

In addition, differential pressure flow measurement instrument loops contain a non-linear signal processing element (the square root extractor) due to the relation between flow rate and differential pressure. This presents a problem in combining errors from different sources because uncertainties that are approximately normally distributed in the input signal to a non-linear device, are not normally distributed in the output signal.

The validity of combining uncertainty estimates using the square root of the sum of the squares (sometimes called the SRSS "method"), depends fundamentally on linear processing. This problem is sometimes avoided by approximating the characteristic EWR 5126 Design Analysis DA EE-92-089-21 Page 36 of 52 Revision ~

curve of non-linear devices by truncating the Taylor expansion at the first derivative (linearizing). For flow loops, this method can only be used with accuracy for errors at flow rates that are high relative to the instrument span. It is appropriately used in some process measurement calculations when the concern is only for errors near specific setpoints in the high flow region of the instrument span.

In these analyses, uncertainties are processed through the square root extractor using the general relation below which is documented in Reference 45 (Table 1 of Section 6.3.2 of draft report ISA-RP67.04, Part II).

SZ =100+ [ (%h+h ) 100-~%h/100]

where:

F = Flow error in percent span h = Head in percent span h, = Head error in percent span All uncertainties that affect the measurement signal prior to the input of the square root extractor are treated as head errors (converted from flow error, if necessary). Errors that affect the, output signal of the square root extractor, including the accuracy of the square root module itself, are processed linearly and can normally be combined using SRSS.

In order to accommodate the variability of uncertainties over the flow span, perform the non-linear transformations, and avoid a large volume of manual arithmetic, a computer program using the advanced spreadsheet environment (QUATTRO PRO) is used to process data. Data for the stated percent flow are listed in the following sections for reference and verification purposes.

Graphical representation of flow indication uncertainty over the entire flow span is shown in Figure 2. Computer program documentation is provided in Attachment C.

Instrument loop flow paths to be evaluated.

Path 1 Uncertainties affecting the output of FC-464A Flow Path 2 Uncertainties affecting the output of FI-464.

Flow Process Measurement Uncertainty (PMU)

Path 1 EWR 5126 Design Analysis DA EE-92-089-21 Page 37 of 52 Revision ~

Biases will be accounted for in Section 9.9.

PMU = (Pea)

PMU = +0.90~

Path 2 Biases for path 2 require insertion into error equations defined in Section 9.0 for both the multiplier/divider and the square root extractor. The calculated values of biases associated with this uncertainty path are stated in section 9.9.

PMU = (Pea)

PMU = +Oe76>o 9.2 Measurement and Test Equipment Uncertainty (M&TEU)

Path 1 M&TEU = +[(Sce,) + (Sce2) + (Rce,) + (Rce6) 2]

M&TEU = + [ (0. 10) + (0. 21) + (0. 10) + (1. 00) ]

M&TEU = +1 ~ 03 ~o Path 2 Input side of multiplier/divider M&TEUmi = +[(Sce,) + (Sce2) + (Rcet;) + (Rceyp)

= + [ (0. 10) + (0. 21) + (1. 00) + (1. 00)

]'&TEUmi

]

M&TEUmi = +1. 43 Output of multiplier/divider input side of square root extractor M&TEUi = +[(Rce>) + 2*(Rce,) ]

M&TEUi = +[(0.20) + 2*(1.00) ]

M&TEUi = +1.43 EWR 5126 Design Analysis DA EE-92-089-21 Page 38 of 52 Revision ~

Output side of square root extractor M&TEUo = +[(Rce,) + (Rce,) + (Rce5) + 2*(Rce,) + 2*(Rce,) ]

M&TEUo = +[(0.20) + (0.10) + (0.10) + 2*(1.00) + 2*(1.00) ]

M&TEUo = +2.01 9.3 Determining the Accident Environmental Uncertainties (AEU)

For Pipe Breaks:

AEUp =+[(Crae,) ] + AB AEUp =+[(0.82) ] + (-11.56)

AEUp =+0 ~ 82+o + ( 1 1 56) ~o For Seismic Events:

Path 1 AEUs = +[(Se,) + (Se,)

]'EUs

= +[(1.00) + (1.00) ]

AEUs = +1. 414 Path 2 Input side of multiplier/divider AEUsmi = +[(Se,) ]

AEUsmi = +[(1.00) ]"

AEUsmi = +1.00 Output of multiplier/divider input side of square root extractor AEUsi = + [ (Se2) ]

AEUsi = +[(0 ~ 45)

AEUsi = +0 '5 EWR 5126 Design Analysis DA EE-92-089-21 page 39 of 52 Revision ~

Output of square root extractor AEUso = + [ (Se3) + (Se4) ' (Sez) ]

AEUso = + [ (1. 00) + (0. 20) + (1. 70) ]

AEUso = +1.98 9.4 Accident Current Leakage Effect (CLU)

Path 1-2 CLU = Negligible (Reference 33) 9.5 Rack Equipment Uncertainty (REU)

Path 1 REU = +[(Rea,)

]'EU

= +[(0.50) ]

REU = + 0.504 Path 2 Input side of multiplier/divider There are no rack components prior to the multiplier/divider module FM-464A.

I Output of multiplier/divider input side of square root extractor REUi = + [ (Rea,) + (Rme,) ]

REUi = + [ (0. 50) + (1. 32) ]

REUi = + 0.50 Output of square root extractor REUo = + [ (Rea3) + (Rea,) + (Reaz) + (Rme2) ]

= + [ (0. 50) + (0. 50) + (1. 50) + (l. 32) 'EUo

]

REUo = + 2.12 EWR 5126 Design Analysis DA EE-92-089-21 Page 40 of 52 Revision ~

9.6 Sensor Uncertainty (SU)

Path 1-2 SU = +[(Sa)' (Sspe) + (Ste) ]

SU = +[(0.65) + (0.27) + (0.27) ]

SU +0 7 6+o

~

9.7 Drift Uncertainty (DU)

Path 1 DU = +[(Sd) + (Red,)

]'U

= +[(0.50) + (1.00) ]

DU = +1 ~

12'ath 2

Input side of multiplier/divider DUmi = +[(Sd) ]

DUmi = +[(0.50) ]

Output of multiplier/divider input side of square root extractor DUi = +[(Red2)

]'Ui

= +[(0.25) ]

DUi = +0.25 Output of square root extractor DUo = +[(Red,)

]'Uo

= +[(0.75) ]

DUo = +0.75 EWR 5126 Design Analysis DA EE-92-089-21 Page 41 of 52 Revision ~

9.8 Tolerance Uncertainty (TU)

Path 1 TU = +[(St,) + (Ret,)

]'U

= +[ (1. 00) + (1. 00) ]

TU = +1 ~ 4 1+o Path 2 Input side of multiplier/divider TUmi = +[(St,) ]

TUmi = + [ (1. 00) ]

TUmi = +1.004 Output of multiplier/divider input side of square root extractor TUi = +[(Ret2)']'

TUi = +[(1.00)

]'Ui

= +1.00 Output of square root extractor TUo = +[(Ret~) + (Ret,) + (Retz)']"

TUo = +[(1.00) + (1.00) + (2.00)']

TUo = +2.45 9.9 Calculating the Total Loop Uncertainties Provide the total loop uncertainty (TLU) for each end device for normal, seismic and accident conditions, as applicable.

Path 1 TLU = + (M&TEU + REU + SU + DU + TU + PMU ) + PMUbiyggs TLU = + (1.03 + 0.50 + 0.76 + 1.12 + 1.41 + 0.90 ) + PMUbfgRQJ I TLU(+) = (2.437) + Pma>> + Pma2B TLU(-) = -(2.437) + Pma>> + Pma2>

TLU(+) = (2.437) (-1.33) (-0.36)

~

+ +

EWR 5126 Design Analysis Revision DA EE-92-089-21 Page 42 of 52

TLU(-) = -(2 437) + (-1.33) + (-0.36)

~

TLU (+) = 0 ~ 74+o TLU( ) = 4 ~ 13 o Path 2 Input side of multiplier/divider MDIV = + (M&TEUmi + REUmi + SU + DUmi + TUmi + PMU )

MDIU = + (1-43 + NA + 0.76 + 0.50 + 1.00 + 0.76 )

MDIU = + 2.11 Output side of multiplier/divider MDOU = +3.40 (See Section 9.0)

Input side of square root extractor SRIU = + (M&TEUi + REUi + DUi + TUi + MDOU )

SRIU = + (1.43 + 0.50 + 0.25 + 1.00 + 3.40 )

SRIU = + 3.86

.Output of square root extractor SROU = 2.19 (See Section 9.0)

Output side of square root extractor SRSS = + (M&TEUo + REUo + DUo + TUo )

SRSS = + (2.01 + 2.12 + 0.75 + 2.45 )

SRSS = + 3.89 Total Loop Uncertainty TLU( ) = +(SROU + SRSS ) + TLUe TLU(+) = +(SROU + SRSS ) + TLUTE TLU(-) = -(2.19 + 3.89 ) + (-1.03)

TLU (+) (2.19 + 3.89 ) + (-1. 03)

TLU (-) -5.50 TLU (+) 3.43 EWR 5126 Design Analysis DA EE-92-089-21 Page 43 of 52 Revision ~

Path 1 TLUa =CLU+(AEUp + M&TEU + REU + SU + DU + TU + PMU ) +

PMUbgR,~~ + AB TLUa =0.00 + '(0.82 + 0.50 + 0.76 + 1.12 + 1.41 + 1.19 ) +

PMUbi+ AB TLUa (+) = 0. 45>o TLUa(-) = -16.484 Path 2 Input side of multiplier/divider MDIU = + (AEUP + M&TEUmi + REUmi + SU + DUmi + TUmi + PMU )

MDIU = + (1.49 + 1.43 + NA + 0.76 + 0.50 + 1.00 + 0.76 )

MDIV = + 2.26 Output side of multiplier/divider MDOU = +3.51 (See Section 9.0)

~

Input side of square root extractor

~

SRIU = +(M&TEUi + REUi + DUi + TUi + MDOU )

SRIU = + (1.43 + 0.50 + 0.25 + 1.00 + 3.51 )

SRIU = + 3.96 Output of square root extractor SROU = 2.25 (See Section 9.0)

EWR 5126 Design Analysis DA EE-92-089-21 Page 44 of 52 Revision ~

Output side of square root extractor SRSS = + (M&TEUo + REUo + DUo' TUo

)'RSS

= + (2.01 + 2.12 + 0.75 + 2.45 )

SRSS = + 3.89 Total Loop Uncertainty TLU (-) +(SROU + SRSS ) + TLUTE + AB TLU (+) +(SROU + SRSS ) + TLUs TLU (-) -(2.25 + 3.89 ) + (-1.03) + (-18.60)

TLU (+) (2 25

~ + 3 ~ 89 ) + (-1.03)

TLU (-) -24.12 TLU (+) 3.46 Path 1 1

TLUs = + (AEUs + M&TEU + REU' SU' DU + TU' PMU')' +

PMUbgsses TLUs = + (1.41 +. 1.03 + 0.50 + 0.76 + 1.12 + 1.41 + 1.19 ) +

PMUbisses TLUs(+) = (2. 92) + PMU~

TLUs(-) = (2.92) + PMU~

TLUs (+) = 0. 694 TLUs(-) = -5e164 Path 2 Input side of multiplier/divider MDZU = + (AEUs + M&TEUmi + REUmi' SU + DUmi + TUmi + PMU )

MDIV = + (1.00 + 1.43 + NA + 0.76 + 0.50 + 1.00 + 0.76 )

MDIU = + 2.33 Output side of multiplier/divider EWR DA 5126 Design Analysis EE-92-089-21 Page 45 of 52 Revision ~

MDOU = +3.56 (See Section 9.0)

Input side of square root extractor

~

SRIU = + (AEUsi + M&TEUi + REUi + DUi + TUi + MDOU

~ ~ ~ ~

)

SRIU = + (0.45 + 1.43 + 0.50 + 0.25 + 1.00 + 3.51 )

SRIU = + 4.00 Output of square root extractor SROU = 2.27 (See Section 9.0)

Output side of square root extractor SRSS = + (AEUs + M&TEUo + REUo + DUo + TUo )

SRSS = + (1.98 + 2.01 + 2.12 + 0.75 + 2.45 )

SRSS = + 3.89 Total Loop Uncertainty TLU(-) = +(SROU + SRSS ) + TLUTE TLU(+) = +(SROU + SRSS ) + TLUB TLU(-) = -(2.27 + 3.89 ) + (-1.03)

TLU(+) = (2.27 + 3.89 ) + (-1.03)

TLU(-) = -5.54 TLU(+) = 3.47 Where: TLUs The Total Loop Uncertainty Seismic TLUa = The Total Loop Uncertainty Accident CLU Current Leakage Uncertainty AEUs = Accident Environmental Uncertainty (Seismic)

AEUp = Accident Environmental Uncertainty (Pipe Break)

PMU Process Measurement Uncertainty REU Rack Equipment Uncertainty SU Sensor Uncertainty DU Drift Uncertainty TU Tolerance Uncertainty M&TEU= Measurement and Test Equipment Uncertainty EWR -5126 Design Analysis DA EE-92-089-21 Page 46 of 52 Revision ~

MDIU Uncertainty in equipment prior to the multiplier/divider MDOU Uncertainty out of the multiplier/divider SRIU Uncertainty in equipment prior to the square root converter (Head Error)

SROU Uncertainty in equipment prior to the square root converter (Flow Error)

SRSS Uncertainty in equipment including and after the square root converter (Flow Error) e 'c Path 1 - 12.1> Full Flow

&~6%5 Path 1 Z~~ 94 ~ 7+o l Ful Flow Path 2 9.10 Comparing the Reference Accuracy vs. the Calibration Tolerance From the calibration procedure(s), identify the calibration tolerance associated with each component. Next, obtain the reference accuracy associated with each component. Translate both effects into the equivalent units. Ensure that the calibration tolerance is greater than or equal to the reference accuracy for each component.

0 e c c c e c Therefore, the calibration is acceptable.

EWR 5126 Design Analysis DA EE-92-089-21 Page 47 of 52 Revision ~

10. 0 Set@oint Evaluations 10.1 Assigning the Limits For each instrument function, identify the associated limits and limit type.

3.6 X 10 h Inc 0.4 X 10 h Inc 3.7 X 10 h Inc 0.55 X 10 h Inc EOP Setpoints L.7 and L. 8 are operational setpoints with no basis that need verification. Additionally, normal instrument channel uncertainties, shown in Figure 1.0 (Conclusion; Section 11.0) of this evaluation, will cause no operational concerns.

High High Steam Plow Isolation dp corresponding to 3.7 K 10 pph at 755 psig = 910" of H20:

Maximum Acceptable Setpoint = Limit - TLU

= 910" of H>0 - (0.0413*959.5)" ofH,O 870 " of H20 The actual setpoint of FC-464A for the High-High steam flow trip is 45.9 mA which corresponds to a differential pressure of 861.5" of H20. This setpoint is below the maximum allowable setpoint and is therefore acceptable.

High Steam Plow Isolation with Low T ~

dp corresponding to 0.55 X 10'ph at 755 psig = 20.1" of H20:

Maximum Acceptable Setpoint = Limit - TLU 20 1n of H20 - (0.0229*959 5) n of H20

-1.87" of H20 The actual setpoint of FC-464A for the High steam flow trip is 10.44 mA which corresponds to a differential pressure of 10.55" of H,O. This is above the maximum setpoint calculated above, and therefore this setpoint is not acceptable. PCAQ 94-067 was issued to address this concern. Per Reference 47, the maximum allowable limit will be changed to .66x10'pm 8 1005 psig. PCAQ 94-067 is resolved in Attachment 1.

EWR 5126 Design Analysis DA EE-92-089-21 Page 48 of 52 Revision ~

Temperature Allowable Value Tech Spec Table 3.3.2-1 identifies the setpoint for the High Steam Flow with low T,, as having a setpoint of 545'F with an allowable temperature of a543'F. The uncertainty in T,~ (TC-401A) is +1.77'F (DA EE-92-091-21), therefore, this setpoint is acceptable. PCAQ 94-068 was originally initiated due to low existing margin, however, subsequent instrument drift studies have shown that uncertainty values are conservative. PCAQ 94-068 is therefore considered resolved.

10.2 Evaluating the Setpoint(s):

Compare the existing setpoint, reset point or indicated value within the calibration procedure with the maximum or minimum acceptable setpoint.

861.5 " of H 10.55" of H ~~

~~c 863.9" of 0" of H H ~~

EWR. 5126 Design Analysis DA EE-92-089-21 Page 49 of 52 Revision ~

11.0 Conclusion A review of the instrument loop performance requirements against the'existing loop configuration for F464 was conducted by this evaluation. The results of this review determined the safety related instrument channel F464 will provide satisfactory main steam flow indication, however the setpoint associated with ESF input for high steam line isolation required further review.

A review of the adequacy of the calibration activities and calibration procedure CPI-FT-464, "Calibration of Steam Generator A Steam Flow Pressure Transmitter FT-464" and calibration procedure CPI-FL0-464, "Calibration of Steam Generator A Steam Flow Loop 464 Rack Instrumentation", was also conducted under this Instrument Loop Performance Evaluation. All applicable safety related components are adequately calibrated up and downscale using correct calibration techniques.

The normal and accident total loop uncertainties for the steam generator flow indicator is graphically shown in Figure 1. These uncertainties are considered acceptable causing no operational concerns.

The high flow and high-high flow steam line isolation inputs were evaluated in Section 10.1 of this calculation. The High-High steam flow isolation setpoint was found to be acceptable. The High steam flow with low T,~ isolation setpoints required further review. Per Reference 47 and Attachment 1, a new maximum allowable limit for this setpoint has been specified, and the existing setpoint has been shown to be acceptable.

EWR 5126 Design Analysis DA EE-92-089-21 Page 50 of 52 Revision ~

Fl 464 Flow Indicator Error Curve 25 20 Q) 0 15 O

M 10 C

Q 0

0)

CL 20 25 0.00 0.38 0.76 1.10 1.50 1.90 2.30 2.70 3.04 3.42 3.80 Steam Flow Rate (MPPH)

Figure 2.0 EWR 5126 Design Analysis DA EE-92-089-21 Page 51 of 52 Revision ~

ATTACHMENT 1 IZCSot.wTioa uF tCACV 9Y-O&'7 MSL csv A(Cs((STEAM Pion v2(K LL2& T(d(V Q52~g g(5 /c/F o(e.( cd%~24 %ac>>~ kotc2 hocv(Ass~ 4l ieec 'Qh, GC- 0 5- t 0),

lee i dL'II dua l u cer4.' 4'o s Ro P ("9 c9 o4 FC.-'/&YA/'fo c

Cam 4C req(aCC4 La2o& a. SC<g'le WL24(Rl 2A~CCr4o~ky lb'-.95% Fc-w4'IA/8 = +'. 5(%

+Juan'7-g 4 T4 Qc2( use( r4<Q~ cog 4c Aijh 54an F(o2Rs scrape(4 'Lr N5'L is FC FT - ->QPC PIOI'SX TRIP (FS. -Q.9 ()

V~

QLL( "- -( Fs + FT a fc ) p Process BIases Tt Q=

+r "g.9 >+ .)5 ~ y .5( )

z,>>~

< reocsc glaseg I

TLLl.= +(.'fO + 'P~cc+S 82'cgc5:

Pouceos BIaces Po(aIe PPoaoos = ((.YSEx (% 2 (l (d )jt[ /2 (Tel(IS/ )j<<o EvAI uATC PeR A SF +ST/oe <IJT o F 0 'V ouIP/I( ((Z. (

~ I fu(( g(om)

TL(2= ~(9+cI(-,(9((E x(2.( )+( ~ 'YE x(2 I )= +l.'vo ( (-.ea22)

To4L 0 (crt-4y 2 d.~c4-0, /ooppot G.aveRT To 'bf: 2/F Wo.95 (SF (9I ) = I'o< 99(9)= .I wwc TL(d=c (.9oZ / oC DP s(o'a~ = 9'59.5 w c x (.9e2'/ - ~Z5Iawc loo -I.

hlEWRA)C. A~~ASt ~ Vht uE, FRO~ R6VCamVCt-. 17= .56MPP4= Z8.95 i' nag eV 4 7L(j= lo./o?, + ( 3 5 9'Io.( u= c9.0S Isu(c 2t'08]a/LalC I S LOESS THhhl ZSo'9g tNMC LIMNI Tq T'HERC RIR6, ACCGPTAP~.

EWR 5126 Design Analysis DA EE-92-089-21 Page 52 of 52 Revision ~

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