ML20058M171

Second-Level Undervoltage Relay Setpoint

ML20058M171
Person / Time
Site:	Quad Cities
Issue date:	05/20/1992
From:	Schiavoni R SARGENT & LUNDY, INC.
To:
Shared Package
ML20058M143	List: ML20058M140 ML20058M145 ML20058M149 ML20058M154 ML20058M158 ML20058M164 ML20058M167 ML20058M171 ML20058M174
References
8913-73-19-4, 8913-73-19-4-R01, 8913-73-19-4-R1, NUDOCS 9310040050
Download: ML20058M171 (23)

Text

.

487171 i

s S&L Letter No. Q1479E J

i May 26, 1992 i

Project No. 8913-73 Commonweal [hEdisonCompany Quad Cities Station - Unit 2 Second-LevelUndervoltageRelak Satpoint QA Calculation, Revision 1

?

Mr. M. L. Reed Electrical /I&C Design Superintendent Nuclear Engineering Department Commonwealth Edison Company 1400 Opus Place, Suite 400 Downers Grove, Illinois 60515

Dear Mr. Reed:

Enclosed is a copy of Design Input Transmittal (DIT)

QC-EXT-0063-01 which transmits Sargent & Lundy Calculation 8913-73-19-4, Revision 1, dated May 20, 1992, 1

entitled " Calculations for Second-Level Undervoltage Relay Setpoint."

The locations of the calculation purpose, methodology, assumptions, and any engineering judgements are referenced in the enclosed DIT.

As requested, the calculation follows the general guidelines contained in Commonwealth Edison Company (CECO) internal standards for instrument setpoint accuracy TID-E/I&C-20 and TID /I&C-10 in developing the degraded voltage relay setpoint.

The scope of this calculation is to determine a degraded voltage relay setpoint based on a Post-LOCA Auxiliary System Voltage as Analysis.

As we have discussed, a degraded voltage relay.setpoint based on the results of Post-LOCA Steady-State Analysis can only be considered an interim setpoint.

The setting does not address the voltage requirements associated with block-motor starting or evaluate possible motor tripping if bus motor voltage dip is low enough to delay motor acceleration.

The setpoints recommended in the calculation are ' based on minimum acceptable Post-LOCA 4160 V switchgear voltages of 3820 V at j

D JSAiSDESOSoofS4y IIh P

b 9

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1g7373 Mr.

M.-L.

Reed S&L Letter No.-Q1479E Commonwealth Edison Company May 26, 1992 Page 2 i

~

Bus 24-1.

Bas,ed on the setpoint error determined in the calculation, the maximum voltage at the 4160-V safety-related switchgear required to reset the relay is about 3~928 V or 94.4%

of 4160 V.' This means that a voltage dip during a motor start or other trap /sient which results in the relay dropping out must recover above the reset point to avoid a spurious trip.

Therdfore, it is prudent to administrative 1y monitor the' voltage at the 4160-V buses as a precaution so that potential voltage concerns can be predicted and concerns can be predicted and corrected prior to actuation of the relay which can result in'a unit trip.

If you have any questions, please contact me at (312)269-6246.

Yours very truly, R. M.

Schiavoni Senior Electrical Project Engineer t

RMS:mco In duplicate Enclosure q#qc2761.ep Copies:

)

BWR Systems Design Superintendent (H. L. Massin)

(1/1/0)

CHRON System (1/1/1) i BWR Technical Lead Engineer (M. S. Tucker)

(1/1/0)

Site Engineering Supervisor (C. A. Moerke)

(1/1/0)

~

Asst. Supt. of Work Planning (W. McGaffigan)

(1/1/0)

Acting BWR Systems Design Supervisor (B. M. Wong)

(1/1/0)

R. H. Jason (1/1/0)

T. J. Ryan (1/0/0)

~

E. Schumacher/T. R. Eisenbart/ File (1/1/1)

S.

Z. Haddad (1/1/0)

.L O i J ( L SARGENT & LUNDY DESIGN INFORMATION TRANSMITI AL ENGINEERS X

SAFETY-RELATED NON-SAFETY-RELATED DIT No. - OC-EXT-0063-01 Page 1

of 1

CLIENT Commonwealth Edison Company To M L. Reed STATION O$ad Citib UNIT (S) 2 PROJECT NO(S) 8913-73 SUBJECT Transmittal of Calculation 8913-73-19 4 Revision 1. Dated May 2d.1992. 'Second Level Undervoltace Relav Setooint."

i

/

/

MODIFICATION OR DESIGN CHANGE NUMBER (S) N/A de/

R. M. Schiavoni EPED f

4~~

5/26/92 PREPARER (PLEASE PRINT NAME)

DIVISION PREPARDUS SIGNATURE ISSUE DATE STATUS OF DG3ORMAT10N (nus informadon is approved for use. Design informs 6on, approved for uu, that contains assumptaons or is prehminary or requires further verifica6on (review) shall be so iden6 fad.)

This information is approved for use. Several assumptaons used in the calcula6on listed below require verifcanon.

This informanon is provided in accordance with the terms and condr6ons of the service egnement/ contract between Sargent & Lundy (S&L) and its client governing the sanociated services. With respect to any third party use, $&L does not assume obliga6on to said third party as to the accuracy, completeness, usefulness, or sc,niuLL,iq nature of such information.

IDElff1FICAT10N OF' HIE SPECIFIC DESIGN DG3ORMAT10N TRANSMITIED AND PURPOSE OF ISSUE (List any supporting documents enached to DIT by its title, revision and/or ina e date, and total saamber of pages for each supporting document.)

This DIT transmits to Commonwealth Edison Conpany (Ceco) the following calculanon:

Calculadon 8913-73-19-4, Revision 1 dated May 20,1992, "Second level Undervohage Reisy Setpoint.*

'Ibe purp we, athodology, and assumptions can be found in the following calculation sectaons and pages:

{

Sc'velh ? ac: Section IV, Page 4 1

i

'4sthodology. Secuon Vm, Pages 11 and 12

]

Assungtions and Engmaering Judgements: Section VI, Pages 8 and 9 Conclusions /Rocommenda6ons: Secnon X. Page it This DIT supersedes Drr No. QC-EXT-0063, issued April 21,1992, which transmined Revision 0 of this calcula6on. The changes made in Revision I of this calculanon are identined an its Revision Summary.

C-i SOURCE OF DGORMATION Calc. No. 8913-73-19-4 1

5/20/92 Report No N/A Rev. and/or date Rev. and/or date Other DESTRIBUTION See SAL 'ammer No. Q147PE, Daned May 26,1992.

Form OQ 3.17,1 Rev,2

)

187171 t

Calc. for iscsad-level unearvoltage Cale, no. 83 3-73-19-4 SARGENT& LUNDY

a. lay setpoint a :e c/7, /r, c Rev. I

1. _

2~J>

EPvCWfEERS.

X Safety-telated hon-$sfaty-telated rege i of 20 Client Commonwealth (dison Company h[Mktb4M Date5falCfil.

Prepared spy Project Quad Cities urnit 2, Division 14 Soviewed by %

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bate 26/N Proj. No. 8913-73 Equip. No.

Approved by.. [ L/,.'s-a DateT[1 !7L

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L

/ REVISION

SUMMARY

Rev. O, First Issue, Pages 1-20 Rev.

1, Pages 1-20 This calculation has been revised to include the latest information contained in new References R and S.

Reference R defines a new higher minimum ambient temperature.

Reference S defines a new range of temperature rise within the switchgear cubicle which is the relay environment.

Consequently, the relay setpoints calculation (Section IX) and conclusions / recommendations (Section X) have been revised.

Assumption A.3 in Section VI has been deleted because of the new information contained in Reference R.

Other appropriate changes have been made in other parts of this caluclation.

These changes are identified by a vertical line in the margin.

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Calc. For Second level Undervoltage Calc. slo. 89t]-73 89-4 l

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DGNERS !.

X Safety-telated 36an-$a f ety-telated Page 2 of 20 Client Coemonwealth Edison Company hdOf9L Prepared try 4

M hate Proj.ct ouJo citi. 'innit 2, oi.iiion s e a.. e4i,y MwA 8 8 Y -

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ME[HODOFREVIEW II.

OA CALCULATION REVIEW CHECKLIST

[

TYPE OF CALCULATION O Hand-Prepared Design Calculation Only

.O Computer-Aided Design Calculation Only iO Both hand-Prepared and Computer Aided Design Calculation tFOR HAND-PREPARED DESIGN CALC FOR COMPUTER-AIDED DESIGN CALC (check the appropriate items)

(check the appropriate items) t

g Detailed review of the O A review to determine if the engineering design original calculation.

and analysis computer program (s) used have.been i

validated and documented and that the "O

Review by an alternate, calculation, regardless of the program simplified or approximate used.contains all the necessary documentation method of calculation.

for reconstruction at a later date.

(MUST BE PERFORMED)

D Review of a representative sample of repetitive D

calculations.

A review to verify that the computer program is:

suitable to the problem being analyzed.

(MUST BE PERFORMED)

$ Review of the calculation

~

against a similar calculation D A review to determine if the input data as previously performed.

specified for program execution is consistent with the design input, correctly defines the problem for the computer program algorithm and is sufficiently accurate to produce results within any numerical limitation of the program..

(MUST BE PERFORMED)

O A review to verify that the results obtained from the program are correct and within stated 4 n

g g p gr./g w u, assumptions and limitations of the ro ran and '

1. d4 -

are consistent with the input. (MUS B PERFORMED)

O Validation documentation for te>4orary changes !.

to listed programs or developmental

)rograms ort unique single applicatior, programs siall be reviewed to assure that methods used adequately {

validate the program for the intended s

application.

(WHERE APPLICABLE)

-REVIEWER:

a, DATE:

1. f-2<'- y 2_

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187:171 Ceic. r.r. second-i i une.r ite,.

Ceic. no, esis-n.i3-4 SARGENT& LUNDY, l a.ie, s.tpoint -

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ENGNEERS L

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K Safety-telated hen-$afety-talsted Page 3 of 20 i

Client Commonwealth Edison Company Propered by hete 2

Project Que4 Citiestucit 2. Division 18 novieeed by note Proj. ha. 891]-73 Egeip. he.

Approved by hete t

(III.

TABdE OF CONTENTS r

Section Contents

. Pace No.

.i I.

REVISION

SUMMARY

I II.

METHOD OF. REVIEW 2

i -

i III.

TABLE OF CONTENTS 3

l i

v e

IV.

SCOPE / PURPOSE.

4 i.

-1 l.

V.

INPUT DATA I

i 5

VI.

ASSUMPTIONS 1

'8

't VII.

ACCEPTANCE CRITERIA 10 VIII. METHODOLOGY i

11 s

IX.

CALCULATION i

13 X.

CONCLUSIONS / RECOMMENDATIONS.

18 j

XI.

REFERENCES 19 l

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1.. A 7 -

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.a,.._s EfCsW6ERS t i E

infety-taleted hen-Safety-taleted Popo 4 of 20 Client Commonwealth Edison Company Prepared by note j

Project Oudd Cities' Unit 2, Divlaion tI hevieund by note PreJ. me. ss:3'-73 ti,uip. no.

appre.ed by note SI' COPE / PURPOSE IV.

i l

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'The scope and purpose of this calculation is to determine a setpoint for the second-level undervoltage relays at Quad.

Cities Unit 2 Division II Bus 24-1 based on post LOCA voltage analysis.

This setting will be reevaluated based 1

on an expanded scope analysis of the auxiliary power system or a redesign of the second-level undervoltage relay scheme.

The setpoint will consider the setpoint error of.the.

circuit that monitors the voltage at the 4.16'kV safety-related switchgear.

The circuit consists of a GE type JVM-l l

3, 4200-120 volt potential transformer (PT) (catalog number i

643X94) and an ABB/ITE-27N undervoltage relay (catalog number 411T4375-L-HF-DP).

j c

The calculation is essentially based on the approach i

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adopted in a similar calculation for Dresden Unit.2 (Reference M) and addresses-the following topics:

1 Instrument channel configuration, Process range and Analytical Limit, Loop element data, i

~

Calibration instrument data, Assumptions,

.i Scaling considerations (PT ratio),

Process errors,

- t Trip unit errors,

' a' Calibration setpoint and Allowable Value.

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187171 Calc. For iscond-laws 1 undervoltage Calc. see.- 831).73-19 4

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safety-talsted Ilon-Safety-taleted Page 5 of to

'l Client Commonwealth Edison Company Propered by mete Project Quad: Cities un,it 2,--Division 11 heeleued by hete

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Proj. tie. 8913-73 Eguip. tho.

Appresed by note i

V IkPUTDATA s

i A.

Instrument Channel Configuration (per Reference A.1)

The ABB/ITE 27N undervoltage relay trip unit is fed-from a 4200-120 volt PT.

The 4200 volt side of the.PT is connected to two phases of the 4160 volt i

source at the safety-related switchgear.

The trip unit'is connected to the 120 volt side of the PT.

The trip unit is powered by a 125 volt de source.

B.

Loop Element Data (per Reference A.2, F, G, H, and P) 1.

The PT is a GE, type JVM-3, catalog number 643X94, as per Assumption A.6.

(See Ref. G).

i.

Voltage ratio:

4200-120

(

Accuracy class:

0.3 W,X,M,Y Frequency:

50 Hz,'60 Hz

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Thermal Rating:

750 VA 6 30*C Ambient 500 VA 6 55*C Ambient BIL:

60 kV 2.

The trip unit is an ABB/ITE,. type 27N undervoltage

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relay with a Harmonic Filter (catalog number y

411T4375-L-HF-DP, Ref. A.2) i Setooint Rances j

Pickup:

70 V - 110 V i

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j Dropout:

70% -

• 99.0% of Pickup j

i Dropout Delay:

1 - 10 sec.

i

• Note: Difference between pickup and dropout i

can be set as low as 0.5%.

t ODeratino Ranoes I

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Control Voltage:

38-58 Vdc (48 Vdc nominal 100-140 Vdc (125 Vdc nom.)

l-

)

3 Temperature:

-20 to +55*C (normal)

-30 to +70*C (accident)

Seismic:

6g ZPA Humidity:

0 to 100% no condensation.

(Reference 0, Section 10.3) j Pressure:

Atmospheric, to 5000 ft Radiation:

Gamma 100k rads over 40 yrs.

1 0

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<a' Calc. For $scond-level Undervoltage Celt, the. 8913-73 15-4 72-C ;;~j SAFGENT& tm i

a.i y s.tpoint to.. i ses.-

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K infety-taleted han'lafety-taleted Page 6' of 20 CITeiit Commonwealth Edison Company Prepared by tote Pre}ect Quad JCitles Unit 2 Division 18 novisued by' bete Proj.he.8913-7)

Eguip. he.

Approved by tote 1

V IdPUT DATA fcont.)

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B.

Loop Element Data (cont.)

8 Repeatability Tolerances

@ const temp & const control volt:

+/-0.1%

for volt. range 100 - 140 Vde:

+/-0.1%

i for temp. range +10 to +40*C:

+/-0.41-i 0 to +55*C:

+/-0.75%

-20 to +70*C:

+/-1.50%

The 3 tolerances are cumulative and are considered to be 2(a) values (see Assumption j

B.1 and Reference B).

For the tolerance oir temperature range, the i

repeatability effect is linear over the range

~

of 0 to +55'C, as indicated.in References H-and-I.

C.

Calibration Instrument. Data (per References _D and Q)

It is assumed that a Fluke 45 Digital Multimeter will-

[

be used for the calibration of the trip unit (see Assumption A.4).

1 F;ference Accuracy:

+/-0.2% + 10 digits l

7.ull Scale:

300 Vac, 5 digits Minimum Gradation:

0.01 V

+

l D.

Ca'.ibration Procedure Data 4

i The setting tolerance when setting the trip unit i

voltage is considered to be 0.2 V or about 0.182% for a 1-setpoint near 110 V.

(Refer to Assumption A.1) i

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187171 Cats. For $scond-lev 2l bndervoltage Calc. sho. 8913-73-19-4

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._yl SARGENT& LUNDY li Relay setpoint see. i not.

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1afety-tolsted 16an-Sa f ety-telated Page 7 of 20 i

Client commonwealtti Edison Company P,epared try note Project Quap Citiss Upit 2, Division If Reviased try bote Proj.16o. 8913-73 Equip. 160.

Approved try Date L

INPUT DATA (cont.1 I

/E.

Station Data The circuit for the process is located entirely in the Turbine Building in Environment Zone 35 per Reference A.2.

R e following are the conditions that the circuit 1

will be subject to:

7 E

Normal Conditions Control Voltage Range:

100-140Vdc (see Assumption A.2) 1 l

Temperature Range:

+18. 33 *C - +4 0 *C ( see Ref. R )

t Humidity Range:

0 - 90%

Radiation Level:

<10k rads over 40 years Accident Conditions Control Voltage Range:

100-140Vdc (see Assumption A.2) l Temperature Range:

+18. 33 *C - + 4 0 *C ( see Ref. R )

Humidity Range:

0 - 100% non-condensing As noted in Reference S, the maximum actual temperature inside the cubicle where the relays are installed will be approximately 2.78'C higher than the ambient temperature outside the cubicle.

The minimum actual temperature inside the cubicle where the cubicles are installed will be 0.39'C higher than the ambient temperature outside the cubicle.

Therefore, the relays 5

will experience temperatures in the range of 18.72*C to 4 2. 78'C.

The relay has 2.lready been qualified for humidity variation, seismic events, radiation exposure, and pressure varistion as discussed in References A.2, F,

and O.

3 n

F.

Allowable Value of Switchgear Voltage i

Based on References E and L and Assumption A.7 the 4

minimum voltage required at the 4160 V safety-related switchgear for adequate auxiliary system performance i

is :

i 3820.0 V at 4160 V at Switchgear 24-1 (~Div II) i

=

4 l

l

r 1Di-.

Calc. for 5scond lo,al undervoltege Calc. No. 8983-73-19-4

_,.i l,SARGENT& LUNDY !'

a.iar setpoint too, i note

' 5.

r~; ENGPEERSIJ K

Safety-telated han-Safety-Related Page 8 of 20 Client Commonwealth Edison Company Prepared by Date ProJeet Quatt Cities voit 2. Division tt so,leved by nate Proj. No. 89f3 13 feuip. No.

Approved by Gate VI.

ASSUMPTIONS I

A.

-Assumptions requiring verification

~

J 1.

The setting tolerance used for setting the trip unit voltage is assumed to be +/-0.2 V, which corresponds to about +/-0.182% for a setpoint expected to be near 110 V.

2.

The de control voltage for the undervoltage relays will be within the relay's acceptable range of 100-140 Vdc during both normal and accident conditions.

l 3.

Deleted.

4.

It is assumed that the relay is a Fluke 45 Digital Multimeter.the voltmeter used for setting It is also assumed this voltmeter has been set to a user selected reading rate of 5 (medium) readings per second.

5.

It is assumed that the multimeter is calibrated to meet its technical accuracy specifications as identified in the Fluke 45 literature (Reference D).

Furthermore, it is assumed that the relay is calibrated at a temperature that is within the range of 21 to 24*C.

This assumption is necessary to limit the conservatism in the error due to relay temperature effect to a reasonable level.

6.

It is assumed that the pts on bus 24-1 are the same type and catalog number as the pts on bus 21.

Walkdown data for pts on bus 21 is provided in Reference N.

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187171 Calc. For $scond-level Urderwoltage Calc. tho. 8913-73-19-4 SARGENT& LUNDY l!

meley seepoiat me.. i net.

DONEIRS lI K

Safety-telated thon-5sfaty-taleted Pope 9 of 20 Client Commonwe.ith Edison Company Prepared try tete Project Quad Cities Smit 2, Division il i

Reviewed Ipy hete PreJ. Ilo. 8913-73 Egelp. sie.

Approved try Sete VI.

A SUMPTIONS fcont.)

9

/

A.

Assumptions requiring verification (cont.)

r 7.

The DG HVAC supply fan and RHRS Emergency AHU 2B need be considered in determining the minimum required not

- 4.16 kV system voltage.

~~

B.

Assumptions not requiring verification 1.

It is a general practice for vendors to provida

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device reference accuracy as a 2 value.

Therefore, all reference accuracy (a)specifications, unless otherwise noted, are assumed to be 2(a) values.

Thus, the standard deviation, o, of an instrument's error is one half of the reference accuracy provided by the vendor.

(Ref.

B, Exhibit 1

B, Page 4 of 7.)

2.

The error due to calibration standards is considered negligible.

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1 Cats. For Second level undervoltage Calc. no. 8983-73-19-4

} N& Lm I ser.y se: point nee. i - net.

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t x. Safety-telated hen-Safety-telated Page 10 of 20 t

I Client Commonwealth Edison Company Prepared by hate ProJoct Quod Cities Weit 2. Division it keviouse by I

tete

. Proj. he. 8983-73 Eguip. he.

Approved by hate VII. AbCEPTANCE CRITERIA i

"The relay setpoint will be chosen such that a

i possible voltage for Telay operation, the lowest

-l error, will be no lower than the Analytical Limit asconsidering setpoint identified in Section V.F of this calculation:

3820.0 V at 4160 V Switchgear 24-1 (Div II) 5

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$2cond-level Undervoltage Cats. he. B913-73 19-4 l SARGENT& LUNDY Refer setpoint no. i net.

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1afety-telated hen-1sfety-Related Page 11 of 20 l

Client Commonwealth Edison Company Prepared by Sete Project Quad Cities IW ' 2;~ Division if Revieund by Date Proj. no. 8913-73 Eguip. ho.

Approved by Date I

VIII. M5THODOLOGY 9

The methodology for determining the setpoints is based on v

/

the methods in References B & C.

The nomenclature for the relay setpoint terms, such as pickup, dropout, and reset is taken directly from the relay instruction bulletin (Reference P).

i A.

The error associated with the PT will be established.

I The error for the PT is classified as a non-random process error and will be based on the accuracy assigned to the PT by the manufacturer.

It is not i

expected that the PT performance will be significantly affected by environmental factors.

Therefore, no additional error for the PT will be introduced for environmental factors.

B.

The error associated with the second-level undervoltage relay will be established.

The following items will be considered in determining the setpoint error as a result of the relay:

Reference accuracy (defined by the mfr as repeatability i

at constant temperature and constaat control voltage)

Calibration instrument error (defined by the mfr)

Temperature effect (defined by the mfr as repeatability over temperature range)

Control voltage effect (defined by the mfr as repeatability over the allowable de control power range)

Relay setting tolerance (see Assumption A.1)

Reference accuracy, Calibration instrument error, and a

~

relay setting tolerance are classified as random errors, and will be combined by the " Square root of the sum of the squares"(SRSS) method.

H Temperature effect and control voltage effect are i

classified as non-random errors since their variation is linear and their effect can be predicted.

(See References H and I) t 4

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calc. no. 8913-73-19-4 SARGENT& LUNDY-l nes.y setpoint g

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.2 no,. i see X-Safety-Related han-$afety-taleted Peps 12 of 20 C Cent Commonwealth Idison Company-h Propered by hete f

i Project Ouad cities unit 2, civision #1 eeviewed by not --

Proj. no. 8913 73 Eguip. sea.

appre ed try Lee I

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VIII. MdTHODOLOGY (cont.)

' s I

i The-following items will be evaluated for their effect l

i on the relays' functional c=pability:

Seismic error Humidity error t

i Pressure error l

)

Radiation error Drift error C.

The errors identified above will be combined into total' a

error by adding the total random error to the total 1

non-random error (per Reference ~B, Exhibit F).

I l

All random error values as published by the manufacturer are considered to be a 2*(a) value, or j

twice the standard deviation When the random errors are com(bined by the SRSS method, refer to As1 the o values, or half of the published values, are

.i used.

The outcome of the SRSS method is then doubled in accordance with the methodology described in Ref.

B, Page 2 of 4 l

Exhibit F, All non-random error will be added together by straight i

i addition.

I D.

The nominal dropout for the undervoltage relay will be

.I determined by adding the total error to the Analytical j

Limits.

No margin will be considered in this calculation since all applicable components in the l

circuit have been accurately represented.

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Calc. no. 8913-73-t9-4

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a.i.r setpoint j

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K 56fety-taleted' ben-Sofety taleted Page 13 of 20 Client Commonwealth idison Company Propered I,y Sete ProJoctQuadCities$ nit 2. Division iI hoviseed by hate Proj. he. 8913 73 Eguip. he.

Approved by

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IX.

CALCULATION

/

A.

The PT has a standard published error of +/- 0.3%.

f Experience has shown that than the standard published error.the error is normally. smaller The operating i

voltage will be lower than the rated voltage of the PT.

the actual error will be lower than the Therefore, published error at rated voltage.

We expect that the i

burden on the PT is within the standard test burden of the PT.

Therefore, the maximum error of +/- 0.3% will be considered in this calculation.

PT testing would

~,

have to be performed to justify a smaller error.

The error contributed by the PT is considered to be a process error since the PT is not a calibrated device.

This is classified as a non-random error.

(See i

Assumption A.6.)

~

?

B.

The error introduced by the second-level undervoltage i

relay is developed below:

s 1.

Reference accuracy (assumed to be a 2*a value):

f i

Repeatability at constant temperature and constant control voltage is +/-0.1%

Therefore, a for reference accuracy is 0.05%

i 2.

Calibration Instrument error (assumed 2*a values):

l The reference accuracy at medium sampling rate of a 2

60 Hz voltage signal is +/-(0.2% of reading + 10 least significant digits).

The linear resolution at medium samplin rate on the 300 V range is 0.01 i

V.

Thus, each di it corresponds to 0.01 V.

Therefore, the re erence accuracy is +/-(0.2% of reading + 10*0.01 V).

[

8-If the relay is set near 110V, then 10*0.01V or j

O.lv is equivalent to about 0.0911.

Thus, the 2*a reference accuracy is 0.2911.

5

}

t Since the instrument has a digital readout, there is no reading error.

Also, since the calibration instrument and the.

relay are calibrated within the allowable range as specified by the calibration instrument manufacturer, there is no temperature effect for i

the calibration instrument.

(See Assumption A.5) t i

!w.

~.

1 A 7. 1 7, _1 Calc. For iscond-level Underwoltage Calc. alo. 8913-7)+t9-4

'O.

SARGENT& LUNDY g

a. ley setpoint see. i 5.te s : _~ ~

n EhG:NEERS ii K

$ef ety4eleted han-$efety-Raleted Pope 14 ef 20 Client Commonwealth faison Company Prepared try Bete Project Quad Cities bait 2. Division it havismed try Date Proj. No. 8313-7)

(guip. ho.

Approved Ipy Bete IX.

C LCULATION fcont.)

I Then the 2*a calibration error is 0.291i, and a for the calibration error is 0.146%

3.

Temperature effect:

1 The temperature effect is published as +/-0.75%,

and the absolute effect is 1.5% over the temperature range of 0 to +55'C as discussed in section V.B of this calculation.

Per References H

~~

end I the relay operating voltage increases or decreases approximately at a rate of 0.0273%/*C over the O to +55'C temperature range.

The actual pickup and dropout voltages are lower than the setpoint values if the operating temperature is higher than the temperature at which the relay was calibrated.

Similarly, the pickup and dropout voltages are higher than the setpoint value if the operating temperature is lower than the calibration temperature.

l Then, for a temperature range of +18.72 to +42.78'C and a relay calibration temperature range of 21 to 24*C (per Assumption A.5

),

the temperature effect is developed below:

Negative Temperature Effect:

In determining the error due to relay negative temperature effect, it will be considered that the relay is calibrated at a temperature of 24*C (see Assumption A.5). This will provide a conservative i

reference point from which the temperature effect a

for the relay can be incorporated into the determination of the maximum dropout of the relay.

24*C, a larger portion of the error used in the At calculation for relay temperature effect will be positive, whie.h will provide a conservative nominal dropout.

Neg. Temp. effect = ( 24-18. 72*C)

• 0. 0273 %/*C =

0.144%

~

4 b

1871((

I Calc. For 52cond-level Underweltage

?

g,, g, g,3, l M W *LUND[

l noia, setpo;nt 4

j se. I neto X

1afety-telated inan-Sofety &olated Pege 15 of 2D Client Commonwealth (dison Company i

Propered by thate Project Quad Citles ooit 2. Division il Reviound by

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. Proj. Ilo. 8913-73 Equip. 16o.

Aporoved by tete IX.

C LCULATION (cont.)

I

/

Positive Temperature Effect:

In determining the error due to relay positive i

temperature effect, it will be considered that the relay is calibrated at a temperature of 21*C (see Assumption A.5). This will provide a conservative reference point from which the temperature effect for the relay can be incorporated into the determination of the nominal dropout of the relay.

At 21*C rather than 24*C, a larger portion of the error used in the calculation for relay temperature effect will be negative, which will provide a conservative determination of the relay nominal dropout setpoint.

Pos. Temp. effect = ( 4 2. 78-21*C)

• 0. 0273 %/*C =

0.5951 Thus, the temperature effect is -0.595%

This is classified as a non-random erro/+0.144%

r.

(

4.

Control voltage effect is +/-0.1% over the de l

j control voltage range of 100-140 Vdc.

This is classified as a non-random error.

(See Ref. P).

5.

The Relay settin Assumption A.1).g tolerance is +/-0.182%This is a random error.(per Thus, a for the setting tclerance is 0.0911.

1 6.

By comparison of the acceptable relay conditions provided in Section V.B.2 with the expected station conditions provided in Section V.E, it is evident that no effect on functional capability is introduced as a result of pressure variation or a

humidity variation.

7.

As discussed in Reference A.2, Section 2.7, no 4

effect on functional capability of the relay is

)

introduced as a result of a seismic event since the relay capability envelops the seismic requirement for the relay locations.

8.

According to Reference H, nodri[ terror is expected for the relay as long as the relay is calibrated at reasonable intervals /

1

187171

=

Calc. for Second-level unoersoltage Calc. ho. 8913-73-19-4 lSARGENT&LUNDY nelay setpoint a= --

tee. i nate

-n Safety-telated

- Ihan-Safety-telated Page if, of 20 Client Comecaiwealth (dison Company 1

Propered try

'Date Project QuedlCities Unit 2, Division Ii teviamed kr Bete Proj. slo. 8913 71 (guip. the.

Approved try Date IX.

CA'LCULATION fcont.)

)

C.

The random and non-random errors determined above are now combined.

Negative Non-random error = 0.3% (from PT) + 0.595%

(from relay temperature effect) + 0.1% (from relay control voltage effect).

Positive Non-random error = 0.3% (from PT) + 0.144%

(from relay temperature effect)

+ 0.1% (from relay control voltage effect).,

,f Negative Non-Random Error = 0.9951 Positive Non-Random Error = 0.544%

Random error is determined by the " Square-root of the i

Sum of the Squares" method.

The random errors include relay reference accuracy, calibration instrument error, and relay setting tolerance.

i Random error = t/ ( 0. 05 % ) 2 (0.146%)2 +(0.091%)2 =

• 0.17 9 %

I

+

Then the Total Error is calculated using:

Total = Non-Random + 2* Random i

Total Negative Error (TNE)=(1.00t+280.181)= 1.36%

Total Positive Error (TPE)=(0.54t+2*0.18%)= 0.90%

a

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• EleGWEERS u I

X' Safety-Related man-Safety-holsted Pap 17 v8 20 -

.i CI'ent Comeonweatth Edison Coopany h

Prepared by hets i

Project Qu'ad Cities Ondt 2,71 vision il heelsend by tete Proj. me. 8913-73 Eguip. he.

Approved by tote IX.

CdLCULATION fcont.)

i t

I f

D.

The nominal dropout setpoint is then calculated below:

4160 V Svar 24-1 ( Div. II)

Nominal Dropout (DO) =-Allowable Limit (AL) + TNE (in %

of DO)

-= 3820/(1.0-0.0136)

I

= 3873 V i

Nominal Relay Dropout-Setpoint

= 3873/35 110.65 V (rounded to nearest

=

hundredth volt) i (Note : 35 is the PT ratio) 1 c

Nominal Pickup 3873/0.995

=

3892 V

=

e From the nominal dropout, the maximum dropout and pickup voltages can be determined:

3 Max. Dropout Nominal Dropout + TPE (in 1 of DO)

=

3873 * (1.0 + 0.009)

=

3908 V j

=

),

Max. Pickup

= Max. Dropout / (dropout / pickup ratio)

I

=-3908.0 V / 0.995 3928 V

=

{

(The Max. Pickup is the relay Max. Reset Voltage) j i

,1 i

r.

5 l

(

.i j

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'l t

i f

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8 i

h i

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i i

l 0

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9 1R7iri Calc. For iccond-level Undervoltage Fl-Calc. Ito. 8913-73-19-4 SARGENT& LUNDY I telar seapoint' L

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me.. i ~ ist.

K-Safety-telated alan-Safety-Asiated Page t8 of 20 Client Commonwealth Edison Comoany Prepared try Date Project Quad Cit ies Unit 2, Division il noviamed try hete Proj. elo. 8313-73 feuip. Ilo.

Approved irr hate L,

CONCLUSIONS / RECOMMENDATIONS t

Based on the methods described in References B & C and-the assumptions in nection VI.,

the following is the undervoltage relay: recommended setting for the Division II second-level 4160 V Swor 24-1 ( Div. II)

Nominal Dropout 110.65 V

=

Set the Dropout / Pickup Ratio to the maximum published value of 99.5%, the pickup setpoint is calculated:

E Nominal Pickup Setpoint = 110.65 V / 0.995 = 111.21 V r

The delay setting for the relay was not analyzed in this i

u.':ulation nor was it intended to be.

Thus required per the Quad Cities Unit 2 Technicalthe relay should b Specifications (Reference K), which is 7 seconds.

Please utilize the Instruction Bulletin I.B.

7.4.1.7-7, Issue D (Reference P) when setting the relay since the based on this instruction bulletin.setpoints and setpoint terminolocjy in l

l i

f i

l l

1

- t l

l 3

l l

i f,

i i

Calc. For Second-level Under,altage Cale. he. 8913-73-19-4

& LUNDY telay setpoint as.. I note 2 EfGE.ERS x

Safety-talated han-safety-Related Page 19 of 20 Client Come mwealth Edison Company Propered by Bate Project Quad Cities Unit 2. Division il tevleued by hate Proj. No. 8913-73 feuip. No.

Approved by l

Date t

XI.

REFERENCES A.

DIT Number QC-EPED-0558-00, entitled "ITE-27N UV Relay and PT Technical Data (S/D Info.)", dated 5-14-92.

The following is included in the DIT:

1.

Quad Cities Unit 2 Drawings:

a.

4E-2301, Sh.

3, Rev. X b.

4E-2334, Rev. R c.

4E-2346, Sheet 2, Rev. AE 2.

Work Request Number MPC Nos. PO4-1-91-105 and PO4-2-91-105, entitled " Minor Plant Design Change Package for Commonwealth Edison Company, Quad Cities Unit 2, Replacement of Second-level Undervoltage Relays," dated 3-4-92.

3.

Information on ITE-27N Relay lB.

CECO document Number TID-E/I&C-10, Rev.

O, entitled ~

" Procedure for Analysis of Instrument Channel Setpoint Error and Instrument Loop Accuracy", dated 12-01-91.

lC.

CECO document Number TID-E/I&C-20, Rev. O, entitled

" Basis for Analysis of Instrument Channel Setpoint Error and Instrument Loop Accuracy", dated 12-01-91.

D.

Facsimile from S. Gaconis of CECO-NED to A. Runde of S&L-EAD dated 1-24-91, containing pages 58 and 59 of s

the 1992 Fluke /Phillips Test & Measurement Catalog.

E.

S&L Calculation Number 8913-73-19-1, entitled " Calc.

for Minimum Operating Voltage at 4.16 kV Bus 24-1 for Quad Cities 2/II Safety-related Continuous Loads," approved 4-15-92.

3 F.

ABB document number RC-50.1-A, entitled " Equipment 1

3 Performance Specifications, 27N Undervoltage Relay."

G.

Fax from GE dated 4-13-92, providing information on 3

type JVM-3 Potential Transformers.

t H.

Memorandum of Telephone Conversation betyeen S.

i Boats of ABB and A. Runde of S&L concerning ITE-27N relay '

characteristics, dated 1-23-92.

i I

?

,r i

l

187171 Calc. For i cana-iscal uncornittge Calc. ano. 89f3-73-l?-4

, l SARGENT& LUNDY } ) a.i.y s.tpoint d -:auomU e,e,. i n.to X

Safety-talated non-lafety-Related Page 70 of 20 Client Commonwealth Edison Company Prepared try Date Project Quad Cities Unit 2. Division 11 kevleumd try Date P,oj. 360. 8913-73 E wip. Ibo.

Approved Ipy Date XI.

RfFERENCES (cont.)

/.

Memorandum of Telephone Conversation between C.

of ABB and H.

Downs Ashrafi of S&L concerning effect of temperature on the ITE-27N relays with Harmonic Filter Units, dated 3-30-92.

lJ.

Deleted.

K.

Quad Cities Unit 2 Technical Specification Number DPR-29, Amendment No.

114, Table 3.2-2.

This reference delay requirement. indicates the second-level undervoltage relay time L.

Memorandum of Telephone Conversation between S. Gaconis of CECO and W.G.

2/ Division II Bloethe of S&L regarding Unit 4-1-92.

ELMS Degraded Voltage Calculation, dated M.

S&L Calculation Number 8982-13-19-6, Rev.

1, entitled "Second-level Undervoltage Relay Setpoint,"

Dresden Unit for 2," approved 1-29-92.

N.

Fascimile from S. Witt to J. Wisniewski on PT walkdown data for Qiad Cities, 4 kV bus 21, dated 4-3-92.

O.

Main Line Engineering Associates MLEA 91-014 for Commonwealth Edison Company, entitled (MLEA) Calcu

" Environmental Qualification of Dresden Second Level Undervoltage System and E Environmental Conditions,quipment for RWCU Line break

" dated 1-23-92.

P.

ABB Instruction Bulletin Number I.B.

for ITE-27N relays and others.

7.4.1.7-7, Issue D Q.

Summary of Telephone conversation between R.

of Fluke and A.

Gesinger K. S. Chaudhary of S&L concerning the error calculation of the Fluke 45 meter, dated 4-13-92.

5 R.

DIT No. OC-EPED-0565-01, Temperature," dated 5-13-92." Reactor Building Minimum S.

DIT No. BB-EPED-0178, Calculation Input Data," dated 5-7-92."Undervoltage Relay Accuracy This DIT contains information regarding the actual temperature rise in the switchgear cubicle.

2

~