ML19338F061

Test Rept:Verification of Adequacy of Calculations for Sequoyah AC Auxiliary Power Sys.

ML19338F061
Person / Time
Site:	Sequoyah
Issue date:	10/02/1980
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19338F057	List: ML19338F056 ML19338F061
References
NUDOCS 8010070479
Download: ML19338F061 (13)

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SEQUOYAH NUCLEAR PLANT UNIT 1

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TEST REPORT: verification of the Adequacy of Calculations for the Sequoyah AC Auxiliary

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OCTOBER 2,1980 8010070g;rgj

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TABl.E OF C0" TENTS .-

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I. Sumary II. TVA Conformance to NRC Staf f l'osit ion 4 - TVA propa. int t . at

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method III. Data Sheets:

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Tabic 1: Test Configuration 1 Table 2: Test Configuration 2 IV. References and Test Results a

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I. Summary

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On July 12, 1980 and July 16, 1980, TVA conducted tests on the Sequoyah Nuclear Plant AC auxiliary power system. The purpose of the tests was to collect data ( current, voltage, kilowatts, and running motors ) for a specific load configuration on a specified part of the power system.. Calculations were made for the same loading configuration on the same portion of the power system. The measured values were compared to the calculated values.

In all cases the calculated values were within the specified

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acceptance criteria for this verification exercise. Five percent

. was established as the maximum acceptable difference. As recorded in Section III of this report, the maximum deviation between an installed board voltmeter reading and its corresponding calculated voltage was less than two percent of the observed voltage. All voltmeter readings were near midscale. TVA believes that this exercise i establishes the adequacy of the analytical. methods ured in the design of the AC power systems for its power plants.

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II. TVA Conformance to NRC Staff Position 4 -

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A. Staff Position 4: Optimization of Transformer Tap Settings The voltage Icvels at the saf ety-related buses should be optimized for the full load and minimum load conditions that are expected throughout the anticipated range of voltage variations of the power source by appropriate adjustment of the voltage tap' settings of the intervening' transformers. Ve require that the adequacy of the design in this regard be verified by actual measurement and by correlation of measured values s analytical results. Provide a description of the

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method for making this verification and, before initial reactor

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, power operation, provide the documents required to establish that this verification has been accomplished,

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B. TVA's Proposed Method of Testing:

The requirements set-forth above are not feasible nor realistic before initial reactor power operation, with the exception of optimizing the transformer taps for minimum load conditions.

Af ter reactor power is established, measurements could be taken for certain kinds of l'o ading such as normal operation, normal shutdown, etc. , but there would be no way to load the I =

system with all the emergency loads associated with an emergency

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4 shutdown. In light of the above, our proposed method of verifying the adequacy of the design as calied for in the staff position is as follows:

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For a given time, the configuration for a specified part

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of the auxiliary power system will be recorded along with data (current, voltage, kilowatts, and running motors) taken at specified medium- and low-voltage boards, and applicable grid ar.d/or generator voltages. Using this information, along with manufacturer's data for motors, transformers, etc., voltages will be calculated for the above boards using manual and computer-assisted methods.

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Acceptance et?;eria for comparing the calculated voltages

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accuracy is established and before calculations are made.

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Once the calculation methods are verificJ by comparison i

within the acceptance criteria, calculations performed

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previously by th'e same methods to predict operating

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vo1Iages and to verify transformer tap optimization for

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other conditions, loading, or configurations of the auxiliary power system, such as 2 unit trips, LOCA, etc.,

will be considered valid.

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Data to be recorded Data Pofnts Voltage Current f }@[ Cloned Breakers 161-kV Crid X Start Bus B X X X 6.9-kV Unit Ed IB X X X X 6.9-kV Shu tdown Bd 1A-A X X X X 480-V Shutdown Bd 1Al-A X X X X 480-V Reactor Vent Ed 1A-A X X X X

' One Motor From Each Selected Board X (Measured at motor terminals) i e

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C. Tests Conducted :

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The requirements for the testa defined above were Jr. ciporated in a special raaintenance Instruction in accordanco vi: 1 TVA's

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catablished procubires. Spec tal ?!a intenance in it suc

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SMI-0-317-13, was written to incorporate the re.piir. c ta of EN DES. This di unent was rev Icwed and appreve.1 **y t it Plcnt Operating Review Committee (r011C) before imple~entat i. te': Ling was accomplished at the plant on July 12 and lo. I '.W* . Th+ is e

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tests were conducted as follow:

Test I conducted on July 12, 1980 - Tent Coniis: ara _ti.r 1_ ,

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This test, as described inore fully in the special tair.t enance instruction, was with 6.9-kV unit boards 1B and ID conrected

• to the start hus B through CSST B x-winding with v-vir.:ing unloaded. Measurenents for voltages, current, hi i oin : t s ,

power factor, and recording of closid breakers were taien in i

accordance with the points of measurement tal le (at:qe! cd) .

Board met.crs, Ehere available, were utilizcJ aloan vit: brn:- h recorders and temporary meters. A complete list of . g:!pnent 1 .

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used is listed in the test instruction.

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h Tent 2 conducted on July 16, 1980 - Tes t Ccnf i+;a:;a,t i y 2,

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This test, as described tuore fully in the special r.i: enance 1

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instruction, was with 6.9-kV unit boards 1B and !B . er . eted ~

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to start hus H through CSST B x-winding. Thr.iu.h C.:PI P.

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y-windir.g, 6.9-kV unit 1 oards IA and 1C were connect in to

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start bus A.  !'nf t. 2boardsandconm.inboaro)t,ere Iac' icd through their respective USST's. Measurement < fier ve!: age 44, currents, kilowatts, power factor, and recordinr. of riosed breakers were taken in accordance with the peit:t , of asurenant

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In addition, a 6.6-kV and 480-V motor were started ar. the results recorded.

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Points for Meanu.c. ment ,-

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- Sequoyah Nuclear Plant, tinit 1 f e

Va rtureter Recor.1 >r

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Data Points VM AM k'M PF l'et er _

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. ' Start Bus A XE XE XE X X Start Bus B XE XE XE X X 6.9-kV Unit Bd 1A XE XE XE 7 XI

'6.9-kV Unit Bd 1B XE XE XE X X X X!

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6.9 kV Unit Bd 1C XE XE XE X- XI 6.9-kV Unit Bd 1D XE XE XE X XI

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'6.9-kV Motor Term X X X

1. 6.9-kV Sd Bd 1A-A XE XE XE X X ': XI

'480V Sd Bd 1 A1-A XE XE XE X X X

1. 480V Sd Bd 1A2-A XE XE XE M

'P.eac Vent Bd 1A-A X X X X X Y

. 'l;80V !!otor Term X X X

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'C&A Vent Bd 1A1-A~ X . X

'REAC MOV Bd 1A1-A X -

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'DSL Aur Bd 1A1-A X X i 'ERCW MCC 1A-A XE XE Y i

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XE: ExistingIndicatinginstrument

X: l'oninutalled Indicating Ir.strument

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8: Train A Only Tests 1 & 3 1 I

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m III. DATA SHEET _

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A. Table 1 ,

Station-service bus voltage supplied from CSST B observed reading versus calculated results

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Test configuration 1 161-kV Grid ac 163-kV

- CSST B voltage tap ratio: 156975-V to 6900-V

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Obcerved Results+

Calculated Results Load Voltage Load MW Mtr/ Meter Brush Rec

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Board MW# 9' Voltage Brush 0+ V VAB/VBCX L

6.9-kV Start Bd A 0 0 71,52 0 0 7200 NC .

6.9-kV Start Bd B 13 95 22.92 7011 12/13 2 21 7000 6573/6363

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6.9-kV Unit Bd 1B - -

7011 7.8/7 9 24 7130 6766/6681 6.9-kV Sd Bd 1A-A 2.89 26.1 7004 2.6/1.7 24 7000 -/7042 480V Sd Bd 1Al-A .817 30.78 495 .67/.69 24 495 495/491 480V Reactor Vent Bd 1A-A .072 26.59 483 -/.096 35 434 443/452

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Station-service bus voltage supplied from CSST B observed readings versus calculatei

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Test configuration 2 161-kV Grid at 164.5-kV CSST B voltage tap ratio: 156975-V to 6900-V-Observed Beruits+

C,1culated Resulte Load Voltage

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M4 Mtr/ Me;er Brush Rec Load MW Voltage Brush $+ V VAB/VBCX

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6.9-kV Stare, Bd A 15.4 24.1 7044 10/ . - 7003 -

6.9-kV Start Ed B 15.4 21.2 7057 13 7/14.4 24 7090 6999/6999 6.9-kV Unit Bd 1B - -

7057 7.3/8.16 27 701] 6787/6570

• 6.9-kV Sd Bd 1A-A 2.94 26.5 7049 2.4/2.21 28 7103 6787/699c 480V Sd Ud 1Al-A 94 30.4 493 .65/.72 36 S90 502/495 480V Reactor Vent Bd 1A-A .072 26.6 NC -/.096 49 439 467/.

Start of ERCW pp QA (Motor term V) 6763 6787 Start of AB Gen Sup Fan 1A (Motor term V) 449 466 Load in MW at an angle 9 where Cos 9 equals the pewer factor.

The load and voltage results indicate meter readings versus the brush r? corder r ead:

Voltage between A to B phase and b6 tween B to C phase.

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<v n IV.. REFERENCES AND TEST RESULTS

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p, . . , A. Purpos'e , , , , ,

.Toverifytheadequacyofthedesignreview

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calculations for Sequoyah Nuclear Plant's ac '

auxiliary power system.

-B. Requirements-

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To satisfy NBC Staff Position 4, FSAR QP.33; C. Sources

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TVA (Sequoyah Nuclear Plant) drawings i

i Main single lines 45N504 45N505 45N506

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AC APS key diagram' 15!1500 3

6.9-kV switchgear single' lines . 45N713 l 45N721-1 45N724-1 l 480-kV switchgear and MCC 45N749-1,2

single lines 45N751-1,2

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45N756-1.2

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45N755-1,2 45N732-1,2

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45N779-1

. 45N765-B,9 45N1755-1 i Manufacturer's drawings 33-47035-E62 contract 71-54499 807141-?,3,4

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Manufacturer's motor data sheets-Manufacturer's transformer test sheets t

Sequoyah cable routing schedules

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FSAR

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D. Discussion of Test .

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July 12 ar.d .luly 16, 1980.

1. Accuracy n'~ equipment.

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A. Board meters were of the 3-percet.t clavs.

B. Brush recorders were of the 3-percent cla w .

, C. Ammeters, voltmeters, and power fac*or neters connected temporarily to the boards vere of the 3-percent class.

2. Results.

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Typically, the readings from the board roters and auxiliary supplied neters yicided more conr.istent resul:3. The brush recorded results are generally within 3 n.reent of the meters but did not yield consister.t resalt,. For the second test, ac RMS calibr.ition vol tages wer<. m ..rde.! at cach station but drif t of the brush trae:r.y.s 1:eri noticed

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within minutes of calibration. .\1so, "I and cl n.acc.:racies cxisted. The board rceters vera calibrated an th. rocrd

• whereas the brush recorders were calierat.:d in :3.e 1e.

The current input into the brush rcem di r- wt r : . ; so e

modified by Insertion of a special madt- shunt.

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Starting motor voltage dip values were not rel):.1.i v established by test because of limitat tens in r l.e- I ns t rumen t-capabilities. In both cases, the dip us.s o.ily t i r approximately one cycle.

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. 3. Acceptance criteria.

For this rest, the accuracy of t he installe.' h w i voltmeters was limiting. Five ocreent of t he b . nl voltmeter reading is established as the. n.1::imu.- ' rceptable difference between measured voltage c.nd c.ilculattt m.tane.

E. Results:

1 See sheet 9 for comparison of voltanes between calcaic:t ed and

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measured methods.

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Conclusions:

In all cases, the dif ferences between calcula tt-d .tnd rt asured l voltages were .lcss than the established limit.

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