ML18038A128

Forwards Response to IE Bulletin 79-27 Re Electrical Buses Powering safety-related & nonsafety-related Instrumentation & Control Circuitry.Info Suppls Util 851104 Response

ML18038A128
Person / Time
Site:	Nine Mile Point
Issue date:	01/17/1986
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Adensam E Office of Nuclear Reactor Regulation
Shared Package
ML17055B229	List: ML17055B228 ML18038A128
References
CON-IIT07-450-91, CON-IIT7-450-91 (NMP2L-0588), (NMP2L-588), IEB-79-27, NUREG-1455, NUDOCS 8602100282
Download: ML18038A128 (213)

Text

I REGULATO~INFORM*TION DISTRIBUTION TEM (RIDS)

ACCESSION NBR: 8602100282 DOC. DATE: '86/01/17 NOTARIZED: NO DOCKET 0 F'SCIL: 50-410 Nine Mile Point Nuc l ear Stati one Unit 2i Niagara Moha 05000410 AUTH. NAME AUTHOR AFFILIATION M*NGAN> C. V. Niagara Mohawk. Power Corp.

RECIP. NAME RECIPIENT AFFILIATION ADENSAMi E. G. BWR Prospect Directorate 3 A(s

SUBJECT:

Forwards response to IE Bulletin 79-27 re electrical buses powering safety-related 8c nonsaf et'-related instrumentation 8c control circuitrg. Info supp 1 s util 851104 response. gp/cr/i 0~

DISTRIBUTION CODE: B001D COPIES RECEIVED: LTR / NCL 1 TITLE: Licensing Submittal: PSAR/FSAR Amdts 5 Related Correspondence ZE:

NOTES:

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'7 MIIASAIRA Q PgQOQQg NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE. N.Y. 13202/TELEPHONE (315) 474-1511 January 17, 1986 (NMP2L 0588)

Ms. Elinor G. Adensam, Director BWR Project Directorate No. 3 U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Washington, DC 20555

Dear Ms. Adensam:

Re: Nine Mile Point Unit 2 Docket No. 50-410 Enclosed is the Nine Mile Point Unit 2 response to I.ED Bulletin 79-27 requested by your staff during the Instrument and Control Systems Branch Audit. This information supplements our previous response dated November 4, 1985. ten copies are provided for your use and information.

Very truly yours, C. V. Mang Senior Vice President NLR:ja Enclosure 1233G xc: R. A. Gramm, NRC Resident Inspector Project File (2)

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Ms. Elinor G. Adensam, Director BHR Project Directorate No. 3 U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue Hashington, DC 20555

Dear Ms. Adensam:

Re: Nine Mile Point Unit 2 Docket No. 50-410 Enclosed is the Nine Mile Point Unit 2 response to I.E. Bulletin 79-27 requested by your staff during the Instrument and Control Systems Branch Audit. This information supplements our previous response dated November 4, 1985. Ten copies are provided for your use and information.

Very truly yours,

-)ij(( lLIWLtl, C. V. Manganj Senior Vice President NLR:ja Enclosure 1233G xc: R. A. Gramm, NRC Resident Inspector Project File (2)

1J 2VBB-UPSlC TEST

SUMMARY

page 1

Purpose:

To prove that the DC logic power for the Exide UPS is powered from the B-phase maintenance supply and that a transient occurs on the maintenance supply it can if effect the DC logic such that it will trip the unit.

This test is done with the old internal logic batteries and then repeated with new ones. Each of the inverter trips will be tested to verify that each circuit is still intact will be except DCOV. An AC input transient to simulated to verify that the unit can "ride UPS out" a normal AC input transient without tripping. The K-5 relay pick up and drop out voltages and the DC trip-point of the DC logic will be recorded.

Results Summary:

1.) Xt was verified that the DC logic power supplies are fed from the B-phase maintenance supply.

2.) A rapid open and closing of the upstream normal AC input breaker to the UPS was done and the unit did not trip or go on battery. No noticeable effect was seen on the UPS output.

3.) Each inverter trip circuit except DCOV was tested and each functioned as designed.

4.) Fast transient tests:

With the old batteries still installed a voltage interruption of 100 150 msec duration was given to the AC input to the DC logic of UPS1C. The DC logic was initially at 19.86 VDC. The unit tripped 3 out of 4 times. This was done first with the loads on maintenance supply and then also with the loads on UPS power.

With the new batteries installed there was no trip when the fast transient test was performed 25 successive times. There were no trips but a repeated SCR short alarm occurred which is indicative of noise spikes within the unit.

page 2 5.) The K-5 relay drop out was recorded and was found to be below the trip point of the DC logic power.

6.) Normal transfers were done, UPS to maintenance and maintenance to UPS, with dead batteries and there were no trips of the UPS. The maintenance supply was opened with the UPS feeding the loads and no UPS trips occurred.

CONCLUSION This test. proves that the DC logic power is fed by the B phase maintenance power, and that it is susceptible to voltage transients on the maintenance supply. Ititmay be susceptible to other transients as well because is directly tied to maintenance supply. The test DOES NOT prove the level of susceptibility, that is, it does not prove that the transient was of any set voltage or duration.

The test implies that the batteries may have mitigated the trip but is not conclusive.

Each trip circuit was tested successfully so no failure to any of these occurred that caused the trip.

The fast open/close of the normal AC input breaker proves that the unit. would withstand an AC input transient without failure or without going on battery power.

page 3 Numerical Results:

1.) Fast Transient Tests a.) With existin batteries With loads on maintenance:

At 19.86 VDC (90.0 VAC) ~vari (150 msec.)

At 19.86 VDC (120 VAC) ~tri (150 msec.)

2.) With loads on UPS power:

2 Tries, 1 ~tri (200 msec.)

b.) With new batteries 1.) Approx. 20.0 VDC 25 times,

~no tri . (100 msec.)

2.) The DC logic trips at < 16.9 VDC. (with 84.59 VAC on input).

3.) K-5 relay drop out 45 VAC K-5 relay pick up ** not recorded 4.) The following trips tests were done:

a.) OV/UV b.) ACUV c.) ACOV d.) DCUV e.) Frequency fail f.) Logic Failure g.) Power supply failure h.) Clock failure 5.) The internal battery voltage was measured:

Positive +0.6 Negative +0.04

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Old Batter ,Volta e New Batter Volta e 1.) 1. 19 6.10 2.) 2.48 6.07 3.) 2.24 6.10 4.) 0 '7 6.09 5.) 0.79 6.10 6.) 1.78 6.12

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h On 8/15/91, troubleshooting was done on 2VBB-UPS1C as follows:

a.) With the unit on normal AC with DC and maintenance available an OV/UV signal was generated by opening the CB-3 toggle switch. The unit transferred to maintenance without generating a trip signal. This verifies that an output OV/UV will not cause a trip signal to be generated.

b.) With UPS1C on maintenance A27-S1 was opened with A27-CB1 closed. The logic power for the UPS went dead and shouldn't have. This is evidence that the UPS internal it batteries are dead.

When the UPS is down the internal logic is fed by ar internal power supply with internal battery backup. When the is UPS on line an auctioneering circuit should power the logic.

This auctioneering circuit was verified to be working by de-energizing the maintenance supply with the UPS running.

When this was done the logic remained powered up.

Although this is a deficiency it would not have contributed to the incident because the auctioneering circuit is working. (WR's are written to replace all UPS internal batteries).

c.) With all power sources available the maintenance supply feed was opened to verify the sync monitor circuit to the UPS.

When the breaker was opened the voltage difference alarm came in and the unit sync indication went out. On reclosing the maintenance feed it took 10-15 seconds for the UPS to re-sync to the maintenance supply.

d.) With the load on UPS with the UPS running on normal AC and the DC breaker closed the maintenance supply feed was de-energized. The normal AC was feed was opened. The unit ran at full load off DC (500 amps) for 10-15 minutes with no alarms and no trips.

e.) Put unit on maintenance supply with UPS running off normal AC and CB-2 (DC) open. Opened the logic power and verified that CB-1 will trip.

Put output on maintenance supply. With unit on normal AC and with DC breaker available, the AC output was lowered on the UPS. The AC undervoltage (ACUV) alarm signal was generated at 182 vac and after approximately 10 seconds the unit tripped.

g ) Restored unit to normal AC with DC available, load on maintenance. Raised output voltage to 220 vac and the AC overvoltage (ACOV) trip occurred.

h.) Unit was again restored with unit on normal AC and DC available, load on maintenance supply. Lowered the DC undervoltage (DCUV) caused a trip at 93 vdc.

i.) Due to the possibility of damage to the unit the DCOV (DC overvoltage was not verified. It was determined also that this condition was very unlikely to have occurred.

j.) The UPS was in its normal configuration on normal AC with DC and maintenance available. The upstream AC input breaker was opened and closed three times as rapidly's possible.

This caused an audible "bump" to the input transformer on inrush current but the unit did not transfer to DC nor did it transfer to maintenance. This verifies that unit can maintain the load under input transients. This does not necessarily simulate the actual transient the unit had seen.

Pfrel/1 I WR f190938, troubleshooting plan results, p ~ 5 1.) UPS1C visually inspected.

2.) With the unit running on normal power the K-5 (logic power supply input) relay is energized.

3.) Opened the maintenance supply feed to UPS1C (CB-1, 2VBB-XD501). K-5 relay de-energized. This was verified by opening and closing CB-1 on 2VBB-XD501 while watching the K-5 relay. Read the output paramaters with UPS1C maintenance supply open:

Voltage: Phase 1 to GND: 118.5 vac Phase 2 to GND: 119.5 vac Phase 3 to GND: 121.4 vac Frequency: 59.91 cycles DC Link Voltage: 140.08 vdc 4.) Reclosed the maintenance supply and the K-5 relay re-energized. This is verification that K-5 prefers to be powered from the maintenance supply feed any time that power source is available to the unit.

The SCR short light illuminated when the maintenance feed was restored to UPS1C.

5.) After a short duration with the unit running normally and no test evolutions being done the unit tripped (CB-1 trip, CB-2 trip, CB-3 opened) and the unit transferred to maintenance.

The following alarms were indicated:

1.) FREQUENCY FAIL (on A13A21) 2.) MODULE TRIP 3.) INVERTER OVERTEMP 4.) INVERTER LOGIC 5.) SCR SHORT NOTE: This trip, though, not purposely initiated at this time, is indication that a trip signal to the A13A21 card will initiate a logic trip and transfer the unit to maintenance successfully.

6.) Pushed the reset on the A13A21 card, SCR short cleared but no other alarms.

7.) Opened the P6 plug on CB-4 8.) Turned off A27-CB1 and A27-Sl killing logic power.

9.) Turned on A27-CB1 and A27-S1 (This was done to attempt to reset the logic.)

10.) The following alarms came back in:

1.) FREQUENCY FAIL (A13A21) 2.) MODULE TRIP 3.) INVERTER OVERTEMP 4.) INVERTER LOGIC NOTE: The fact that the alarms were reinitiated when the logic was re-energized is indication the trip stays latched in even if logic power is lost.

11.) Unlatched the motor operator off CB-$ .

12.) Re-installed the P6 plug to CB-4. The operator did not

reposition it'.self.

13.) Reset the motor operator back on CB-4

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Reprint of pages 7-13 of Troubleshooting Plan - WR 8190938

~ 18, 1991

l. Open P6 Block.

2. Open logic power to UPS1C.

3. Reset overtemp switch. (NOTE: IT IS NOT DEFINITE THAT IT WAS TRIPPED.)

Reset overtemp switch on LEG k4.

4. Put A13A20 on extender board.

5. Restore logic power and trace freq. fail signal through A13A20. Replace chips as required.

When logic was restored - all lights were restored.

6. Restore card in slot.

7. Restore logic power.

Attempted to restart unit - closed CB1, pushed module on and module tripped - freq, failed alarm, overtemp, module trip, Inverter logic alarms. No overtemp switches picked up (test each with fluke). See Step 4a (next page)

1I WR 8190938 TROUBLESHOOT SHEET Page 8 August 19, 1991 4a. Turn off logic.

, 4b. Put A13A20 on extender.

4c. Reset logic power

- module on light on 4d. PINS 16 and 46 on A13A20 okay 16 - low 46 - high Stopped testing to repair A13A20 board.

WR ¹190938 TROUBLESHOOT SHEET Page 9 August 19, 1991 Chips ¹1 and ¹4 (Ul and U4) Replaced on A13A20.

1 ~ Open P6 block.

2. Open logic power to UPS1C.

3. Put A13A20 on extender board.

5. Restore logic power.

No alarm found A13A20 chips Ul and U4 cold to touch

6. If alarms reset, close CB1, verify no alarms.

CB1 closed, no alarms found Module on pushed, no alarms with unit running CB2 closed - unit running normal Unit turned off, lock turned off Put A13A20 into slot - normal

7. Install variac on B-phase AC input to logic power supply.

Install GND to input of A27 - F3 (term ¹1)

Hot to input of A27 - F4 (term ¹1)

Remove A27 - F4 put VARIAC output on A27-F4 output (term ¹2) install oscilloscope AC input - Lead ¹243 DC (+) Logic Power - ¹200 7a. Turn logic power on restart unit:

Closed A27-Sl control batt. discharge, logic trip came on.

Closed A27-CB1 alarms clear Closed CB1 Pushed module on - unit running; no alarms Closed CB2

WR 8190938 TROUBLESHOOT SHEET Page 10 August 19, 1991 Steady State- 118.13 VAC to power supplies 19.86 VDC (+) DC logic Lowered VAC to DC P.S. - at 96 VAC, DC volts starts to drop

- at 84.59 VAC, DC volts went to 16.9 VDC unit tripped.

Alarms Power supply, failed inverter logic module trip (recorded (alarms) 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> later from memory)

At 84.59 VAC unit tripped DC went to 16.9 VDC Alarms - power supply fail, logic trip, module trip 12.

13.

14.

13a. With unit tripped open A27-CB1 (Battery Breaker) lowered AC input to power supplies At 45.0 AC, K-5 dropped - seen by logic (DC) power dropping - it dropped to approximately zero (K-5 relay drops out at 45 VAC)

WR @190938 TROUBLESHOOT SHEET Page 11 August 19, 1991

14. Reset logic (off) - A27-CBl and A27-Sl open.

15. Reset variac to 120 vac.

16. Turned logic off.

17, Close CB1.

18. Turned unit on.

19. Closed CB2.

20. Unit running - no alarms (load on Maint.)

21. Open switch on variac with voltage at - 90.00 vac

- opened and closed for 150 msec (Trace 7)

22. Unit tripped Alarms - power supply failed logic trip module trip SCR short

23. Reset logic and reset unit - CBl closed CB2 closed Unit running Variac reset to 120 VAC.

Open switch on variac for 100 msec. - open and closed Unit tripped, CB1 open (Trace 8)

CB2 open Module trip Logic trip

24. Restarted unit CB1 closed CB2 closed logic reset - no alarms Put output on UPS Power Attempted to transfer to UPS power - P6 Block was open - would not transfer

25. Turn unit Off, reset logic, turn logic on Put CB-4 Operator (screw motor) to on Put P6 block back in

WR ¹190938 TROUBLESHOOT SHEET Page 12 August 19, 1991

26. Open CB1 on 2VBB-XD501. No logic trip.

1. Maintenance out of limits (clears)

2. Voltage difference (locks)

- K-5 relay swapped to UPS power

27. Turn Maint. back on. All alarm clear after time delay.

28. Open switch on variac - sustained. No trip, horn sounded, K-5 relay transfers.

29. Flipped switch on variac (off and on) AC voltage down to 58 VAC (found loose lead on fluke

- not secure in plug)

Turned switch off - unit tripped - no lights

- fuse in Variac is still good

30. Restarted unit - leg fuse blown, alarm, impulse trip, Inverter fuse leg ¹5 fuse bad

31. Logic off, CB1 opened CB2 opened

32. Replaced Leg ¹5, fuse unit restarted, transferred to UPS power, all alarms clear.

WR ¹190938 TROUBLESHOOT SHEET Page 13 August 19, 1991

33. Open/Close variac switch - no trip SCR short alarm (200 msec)

Open/Close variac switch - unit trip, power supply fail, logic (inverter) module trip

- possibly 200 msec

(- trace cannot be read)

34. Restore AC logic as follows:

Remove lead from A27-F3 (team ¹1) - variac lead Remove lead from A27-F4 (team ¹1) - variac lead Remove lead from A27-F4 (team ¹2) - variac lead Re-install A27-F4 fuse 3S. Unit left off, load on maintenance

WR ¹190938 TROUBLESHOOT SHEET Page 14

%gust 20, 1991 1.) Measure each battery prior to installing in UPS1C:

1.) 6.10 2.) 6.07 3.) 6.10 4.) 6.09 5.) 6.10 6.) 6.12 2.) Using a leads lifted log replace the control batteries in UPSlC.

3.) Measure battery voltage on each battery removed from UPS1C:

1.) 1.19 2.) 2.48 3.)

4.) 0.17 5.) 0.79 6.) 1.78 4.) Install a variac on B-phase,AC input to logic power supply as follows:

a.) Attach variac input ground lead to input side of A27-F3 (term ¹1).

b.) Attach variac input hot lead to input side of A27-F4 (term ¹1).

c.) Remove Fuse A27-F4.

d.) Attach variac output lead on the output side of A27-F4 (term ¹2).

5.) Install Oscilloscope leads as follows:

a.) one input to scope on A27, lead ¹243 b.) other input to scope on A27, lead ¹200 (+ of DC logic)

WR @190938 TROUBLESHOOT SHEET Page 15 August 20, 1991 6.) Set variac for approximately 120 vac.

7.) Restart UPS1C and put load on UPS power, CB-3 closed.

8.) Slowly decrease AC voltage to the DC logic power supplies.

At 91.95 VAC, DC logic power dropped to 19.15 VDC At approx. 42.94, DC logic recovery to 18.10 VDC (K-5 transferred to UPS, No trip, Horn sounded) 9.) Verify K-5 relay transfers to UPS power.

At 42.94 DC dropped to approximately 17.8 or 17.9.

Turn VAC to 24.0 VAC (K-5 pulled in full) logic went to 19.76 VDC 10.) Restart UPS1C, as required, and put load on UPS power.

N/A Put variac to 120 VAC - per oscilloscope K-5 energized

- power supply on maint.

11.) Flip switch on variac rapidly off then on.

12.) Perform the operation in step 11 multiple times and record whether trips of unit occur.

(See page 15a) 13.) Shutting down unit opened CB2 opened CBl Alarms- power sync trip UV/OV transfer Inverter logic No module trip a.) Opened A27-S1 and A27-CBl Closed A27-Sl and A27-CB1 - alarms still in Opened A27-S1 and A27-CBl

WR ¹190938 TROUBLESHOOT SHEET Page 15a August 20, 1991 SEQUENCE NO. TIME TRIP REMARKS 150 - 200 msec no no SCR short came in 3 no SCR short no SCR short 5 no SCR short 6 no SCR short AC Volt dip to 81 VAC 7 no SCR 8 no SCR 9 no SCR 10 no No Alarm ll no SCR short 12 no SCR short 13 no SCR 14 no 15 no SCR 16 no SCR 17 no SCR 18 no SCR 19 no SCR 20 no 21 no 22 no SCR 23 no SCR 24 no SCR 25 no SCR

I>> 4 WR ¹190938 TROUBLESHOOT SHEET Page 16

~pet 20, 1991 14.) Shutdown unit and remove variac and oscilliscope as follows:

a.) Remove variac input ground lead to input side of A27-F3 (term ¹1).

b.) Remove variac input hot lead to input side of A27-F4 (term ¹1).

c.) Remove variac output lead on the output side of A27-F4 (term ¹2).

d.) Remove Fuse A27-F4.

e.) Remove oscilliscope lead on A27, lead ¹243.

f.) Remove oscilliscope lead on A27, lead ¹200 (+ of DC logic).

g.) Install the A13A21 circuit card on the extender card.

NOTED: Fuse A27-F4 left out - reinstalled.

WR @190938 TROUBLESHOOT SHEET Page 17 August 21, 1991

WR 8190938 'ROUBLESHOOT SHEET Page 18 August 21, 1991 1.) Repair the A13A21 board in UPS1C.

2.) Reinstall A13A21 board in UPS1C on the extender board.

3.) Attach a recording device on the output of the UPS and the maintenance output and prepare to record transfer.

4.) Turn logic power on to UPS1C.

5.) Measure voltage on A27-F4, term. 81 referenced to phase A, B, and C of the maintenance supply:

A27-F4 to Phase A: 212 VAC A27-F4 to Phase B; 0.2 VAC (This verifies DC power supplies fed by B-Phase)

A27-F4 to Phase C: 211 VAC 6.) Lift motor operator on CB-4.

6a.) Install P-6 block.

7.) Reset motor operator on CB-4.

8.) Restart UPS1C and put load on UPS power, CB-3 closed.

9.) Verify no alarms are present in UPS1C.

1 WR 8190938 TROUBLESHOOT SHEET Page 19 August 21, 1991 10.) Initiate each of the following trips and record the alarms found. Record at least one trip - transfer to maintenance.

a.) Frequency failure - not tested now - when A13A20 chip failed (earlier) fed frequency failure to A13A21 verifying logic b.) Logic failure- took pin low - unit did not trip

- possible probe not on ground

- second time took pin 6 low

- unit tripped

- logic fail, fan fail, module trip, inverted logic alarm Took board A13A21 off card cage extender - troubleshoot circuit. Alarm cleared by reinserting card. Unit restarting, load on UPS.

c.) Clock failed- took pin ¹32 low, unit tripped

- logic (inverter) alarm clock failed, module trip 16.) Restore A13A21 to the card cage slot.

17.) Restart unit and put loads on UPS power.

2VBB-UPS1D TEST

SUMMARY

page 1

Purpose:

To prove that the DC logic power for the Exide UPS is powered from the B-phase maintenance supply and that a transient occurs on the maintenance supply it can if effect the DC logic such that it will trip the unit.

This test is done with the old internal logic batteries and then repeated with new ones. The K-5 pickup and drop out voltages and the DC trip-point of the DC logic will be recorded.

Results Summary:

1.) It was verified that fed from the B-phase the DC logic maintenance power supplies are supply.

2.) Fast transient tests:

With the old batteries still installed a voltage interruption of 100 150 msec duration was given to the AC input to the DC logic of UPS1D. The DC logic was at, 20.9 VDC. The unit would not trip. The AC input voltage to the DC logic was then reduced such that the DC logic was at 20.0 volts. When the test was performed with the DC logic power at 20.0 VDC the unit tripped. This was done first with the loads on maintenance supply and then also with the loads on UPS power.

With the new batteries installed there was no trip when the fast transient test was performed though there was significant hits shown on the DC. logic power bus as seen by the oscilloscope.

3.) The K-5 relay drop out and pick up voltages were recorded and they were found to be below the trip point of the DC logic power..

4.) Normal transfers were done, UPS to maintenance and maintenance to UPS, with dead batteries and there were no trips of the UPS. The maintenance supply was opened with the UPS feeding the loads and no UPS trips occurred.

page 2 CONCLUSION This test proves that the DC logic power is fed by the B phase maintenance power and that it is susceptible to voltage transients on the maintenance supply. It may be susceptible to other transients as well because it is directly tied to maintenance supply. The test DOES NOT prove the level of susceptibility, that is, it does not prove that the transient was of any set voltage or duration.

The test implies that the batteries may have mitigated the trip but that is not conclusive.

g~

page 3 Numerical Results:

1.) Fast Transient Tests a.) With existin batteries With loads on maintenance:

At 20e9 VDC five tries, no trips.

At 20.7 VDC one try, one ~tri . (150 msec.)

2.) With loads on UPS power:

At 20.06 VDC one ~tri . (100 msec.)

I b.) With new batteries 1.) At 20.05 VDC Five tries, ~no tri s.

noticeable DC hit on each transient.

J 2.) The DC logic trips at <17.3 VDC. (with 84.5 VAC on input).

3.) K-5 relay drop out 42 VDC K-5 relay pick up 55 VDC 4.) The internal battery voltage was measured:

Positive +0.6 Negative +0.14 (the negative battery set was actually slightly positive).

5.) Individual cell voltages:

Old Batter Volta e New Batter Volta e

.254 6. 10 2.) .570 6.06 3.) 1. 03 6.10

.07 6.10 5.) 1.17 6.13

6.) 1.39 6. 09

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WR ¹190945 TROUBLESHOOTING PLAN Page 3 August 21, 1991 1.) Place the loads off UPS1D on maintenance power.

When unit put to maintenance, CB-4 failed to close. Lifted operator - Bkr.

closed (partial false signal to CB-4).

(Later found to be adjustment of CB-4 operator.)

2.) Open CB-2, CB-1, A27-S1.

3.) Measure and record DC logic power - (this is battery voltage)

(+20) = +.06V

(-20) = +.14V (* verified +.14 volts) 4.) Open A27-CBl.

5.) Measure voltage on A27-F4, term. ¹1 referenced to phase A,B and C of the maintenance supply:

A27-F4 to Phase A: 203.1 VAC A27-F4 to Phase B: 0.0 VAC (Phase B to DC power supplies)

A27-F4 to Phase C: 202.4 VAC 6.) Install a variac on B-phase AC input to logic power supply as follows:

a.) Attach variac output ground lead to input side of A27-F3 (term ¹1).

b.) Attach variac input hot lead to input side of A27-F4 (term ¹1).

c.) Remove Fuse A27-F4.

d.) Attach variac output lead on the output side of A27-F4 (term ¹2).

7.) Install Oscilloscope leads as follows:

a.) one input to scope on A27, lead ¹243 b.) other input to scope on A27, lead ¹200 (+ of DC logic)

4 WR 8190945 TROUBLESHOOTING PLAN Page 4 August 21, 1991 8.) Set variac for approximately 120 VAC.

9.) Lift motor operator on CB-4.

10.) Turn logic power on to UPSlD.

11.) Reset motor operator on CB-4.

12.) Restart UPS1D and put load on UPS power, CB-3 closed.

13.) Slowly decrease AC voltage to the DC logic power supplies.

Start 20.88 VDC at 98.13 VAC DC, power supply went down 20.59 VDC 14.) Record when DC voltage starts to drop-98.13 VAC 20.59 VDC 15.) If unit trips, record voltage at trip point-84.5 VAC Unit tripped. CB-4 failed to close - got CB-4 "ON" flag.

Alarms - vo! tage difference, maint. out of limits 17.3 VDC module trip, inverter logic alarm.

Power supply failed.

16.) If unit trips, lower AC input to K-5 relay until relay drops out.

At 56 VAC relay chattered, 8 VDC on logic At 42 VAC relay swapped - dropped Put reset back up - At 55 relay started to pickup At 75 VAC pulled in 17.) Restart unit, as required, and put the load on UPS power.

18.) Set variac at 120 VAC.

WR 45190945 TROUBLESHOOTING PLAN Page 5 August 21, 1991 19.) Open and close variac switch quickly. Record if trip occurs.

~~, ~ r'-/.~i)i Lipped once - no trip, SCR short alarm - 150 msec '(Trace O9) 20.) If trip does not occur attempt again.

2nd try - AC drops to 119.5 VAC, no trip (Trace @1) 3rd try - AC drops to 84.5 vac on fluke, no trip (100 msec) on oscilloscope - AC dropped 136 VAC, AC dropped 2,3 volts (from 20.9 VDC at start) (see 20a on next page) 20a.) 4th try - no trip 5th try - set variac to 95.0 VAC, VDC at 18.6 - unit tripped.

Power supply failed (Prior to switching variac)

Put unit on maintenance. Tried fast trip at 20.00 VDC - unit tripped.

21.)

22.)

23.)

24.)

25.)

26.)

27.)

28.) Measure each new battery prior to installing in UPS1D.

1.) 6.10 VDC 2.) 6.06 VDC 3.) 6.10 VDC

4) 6.10 VDC 5.) 6.13 VDC 6.) 6.09 VDC 29.) Shut logic power off.

Remove oscilloscope leads.

Remove variac leads.

30.) Install fuse F-4.

31.) Put loads on UPS power.

WR 8190945 TROUBLESHOOTING PLAN Page 6 August 21, 1991

• ANNOUNCE LOSS OF LIGHTS 1.) Place the loads off UPSlD on maintenance power.

2.) Open the P-6 block block on CB-4.

3.) Open CB-2, CB-1, A27-S1, A27-CBl.

4.) Install a variac on B-phase AC input to logic power supply as follows:

a.) Attach variac output ground lead to input side of A27-F3 (term @1).

b.) Attach variac input hot lead to input side of A27-F4 (term 81).

c.) Remove Fuse A27-F4.

d.) Attach variac output lead on the output side of A27-F4 (term k2).

5.) Install Oscilloscope leads as follows:

a.) one input to scope on A27, lead 8243 b.) other input to scope on A27, lead @200 (+ of DC logic) 6.) Set variac for approximately 120 vac.

7.) Lift motor operator on CB-4.

WR 8190945 TROUBLESHOOTING PLAN Page 7 August 21, 1991 8.) Reinsert the P-6 block on CB-4.

9.) Turn logic power on to UPSlD.

10.) Reset motor operator on CB-4.

11.) Restart UPSl D leaving loads on maintenance supply.

12.) Open and close variac switch quickly.

Record if trip occurs.

Adjust variac such that DC logic power is at 20.00 VDC AC at 91.28V Switch time - 150 msec DC at 20.07V At unit trip the following alarms observed: nmCE eS)

1. trip 3. SCR short

2. Inverter logic 4. Power supply failed 21.) Restart unit, as required and put loads on UPS.

• Breaker CB-2 failed to reset.

Breaker replaced per WR @177123.

22.) Open CB-1 on 2VBB-XD600 and verify that unit does not trip.

Unit did not trip. The following alarms were observed:

1. Voltage Difference

2. Maintenance out of limits 22.) While on UPS power without maintenance available record the following:

'PS output voltage: Phase A; 121.0 VAC Phase B; 120.0 VAC Phase C: 121.5 VAC DC Link voltage: 140.7 VDC UPS output Frequency: 59.93 HZ AC output 24.) Close CB-1 on 2VBB-XD600.

WR 8190945 TROUBLESHOOTING PLAN Page 8 August 21, 1991 25.) Adjust motor operator on CB-4 as required.

Unable to adjust at this time.

Restart unit, put load on UPS power - Lower reostat (variac) volts until DC logic is 20.00 volts VDC -20.06 VAC - 100.23

, Flipped variac switch on and off, unit tripped (100 msec.)

Alarms - module trip inverter logic power supply failed 26.) Transfer loads to Maintenance.

26.) Shut down unit including logic power and P-6 block.

27.) Open Ac input breaker, 2NHS-MCC006, 8-A.

29.) Using a leads lifted log replace the control batteries in UPS1D.

Bench Battery Voltage Readings - prior to installation 1.) 6.097 VDC 4.) 6.101 VDC 2.) 6.063 VDC 5.) 6.125 VDC 3.) 6.107 VDC 6.) 6.090 VDC 30.) Measure battery voltage on each battery removed from UPSlD:

1.) .254 VDC 2.) .570 VDC 3.) 1.03 VDC 4.) .07 VDC 5.) 1.17 VDC 6.) 1.39 VDC 31.) Set variac for approximately 120 vac.

32.) Restore P-6 block on CB-4.

33.) Lift motor operator on CBA.

WR ¹190945 TROUBLESHOOTING PLAN Page 9 August 21, 1991 34.) Turn logic power on to UPSlD.

35.) Reset motor operator on CB-4.

36.) Restart UPS1D and put load on UPS power, CB-3 closed.

Lower variac voltage to 99.03 VAC until DC logic voltage is approximately 20.05 VDC 37.) Flip switch on variac rapidly off then on.

38.) Perform the operation in step 11 multiple times and record whether trips of unit occur.

1. No trip, 100 msec No alarms

2. No trip No alarms

3. No trip SCR short alarm 4, No trip, 100 msec (noticeable DC hit) No alarms (Trace ¹3)

5. No trip, 150 msec (noticeable DC hit) SCR short alarm (Trace ¹5) 39.) Shutdown unit and remove variac and oscilliscope as follows:

a.) Remove variac output ground lead to input side of A27-F3 (term ¹1).

b.) Remove variac input hot lead to input side of A27-F4 (term ¹1).

c.) Remove variac output lead on the output side of A27-F4 (term ¹2).

d.) REINSTALL Fuse A27-F4.

e.) Remove oscilliscope lead on A27, lead ¹243.

f.) Remove oscilliscope lead on A27, lead ¹200 (+ of DC logic).

39a.) Restart unit and put loads on UPS power.

WR 0190945 TROUBLESHOOTING PLAN Page 10 August 21, 1991 40.) Static swithc is operating as noted by observation of static switch light on control module during UPS to maint transfer.

41.) Measure B-phase AC input voltage to DC logic power supplies 118.34 VAC Measure DC logic power with unit on line

(+2ov) 20.78 VDC

(-2ov) -20.86 VDC

~42.) Adjust motor operator on UPSlD Unable to adjust CB-4, Maintenance supply breaker. CB-4 requires replacement. Problem determined to be the breaker or the transfer motor operator. WR 177124 initiated to replace breaker CB-4.

(-Breaker replaced.)

43.) Perform transfer - UPS to maintenance Record transfer with visicorder

• NOTE: UPS output breaker CB-3 is sticking and requires replacement.

2VBB-UPS1A 1B 1G TEST

SUMMARY

page 1

Purpose:

To prove that the DC logic power for the Exide UPS is powered from the B-phase maintenance supply. The K-5 pickup and drop out voltages and the DC trip-point of the DC logic will be recorded for UPS1A, not for UPS1B and UPS1G. The internal batteries will be tested and replaced.

Results Summary:

1.) On UPS1A, logic UPS1B and UPS1G, it was verified that the power supplies are fed from the B-phase DC maintenance supply.

2.) The K-5 relay drop out and pick up voltages were recorded for UPS1A and they were found to be below the trip point of the DC logic power.

3.) On UPS1A, UPS1B, UPS1G, the maintenance supply was opened with the UPS feeding the loads and no UPS trips occurred.

4.) On UPS1A, UPS1B and UPS1G, the batteries were replaced.

CONCLUSION This test proves that the DC logic power is fed by the B phase maintenance power. It proves that the internal batteries were effectively dead. For UPS1A it proves that on a slow transient that the DC logic power will drop out before the K-5 relay will transfer to UPS power.

I page 2 Numerical Results:

1.) The UPS1A DC logic trips at (16.7 VDC. (with.75.6 VAC on input).

2.) UPS1A: K-5 relay drop out 47 VDC K-5 relay pick up 52 VDC 4.) The internal battery voltage was measured:

UPS 1A: Positive Negative UPS1B: Positive 0. 54 Negative 6.2 UPS1G: Positive 18.3 Negative 0.69

WR ¹162319 TROUBLESHOOT SHEET Page 3 August 23, 1991 1.) Place the loads off UPSlA on maintenance power.

2.) Pull the P-6 block to CB-4 3.) Open CB-2, CB-l, A27-S1.

4.) Measure and record DC logic power - (this is battery voltage)

+20 VDC Batt. +0.70 VDC

-20 VDC Batt. -1.15 VDC 5.) Open A27-CB1.

6.) Install a variac on B-phase AC input to logic power supply as follows:

a.) Attach variac output ground lead to input side of A27-F3 (term ¹1).

b.) Attach variac input hot lead to input side of A27-F4 (term ¹1).

c.) Remove Fuse A27-F4.

d.) Attach variac output lead on the output side of A27-F4 (term ¹2).

7.) Measure voltage on A27-F4, term. ¹1 referenced to phase A, B and C of the maintenance supply:

A27-F4 to Phase A: 206 VAC A27-F4 to Phase B: 0 VAC A27-F4 to Phase C: 208 VAC

WR ¹162319 TROUBLESHOOT SHEET Page 4 August 23, 1991 8.) Set variac for approximately 120 vac.

9.) Turn logic power on to UPS1A.

10,) Slowly decrease AC voltage to the DC logic power supplies.

120 VAC = 21.08 VDC 11.) Record when DC voltage starts to drop-92.42 VAC Logic trip 75.60 VAC 21.05 VDC Pwr Supply failed 16.70 VDC 12.) Lower AC input to K-5 relay until relay drops out and pickup.

47 VAC drop out 52 VAC pickup e

DO NOT PROCEED WI'I'HOUT NRC APPROVAL Received 13:15 8/23/91 13.) Shutdown unit and remove variac as follows:

a.) Remove variac output ground lead to input side of A27-F3 (term ¹1).

b.) Remove variac input hot lead to input side of A27-F4 (term

¹1).'.)

Remove variac output lead on the output side of A27-F4 (term ¹2).

d,) REINSTALL Fuse A27-F4.

14.) Repair UPS1A. ** CHARGER SUPPLY REPAIR ONLY **

Troubleshot UPSlA - no problem found. Suspect weak breaker ir. VBB-PNL301 (Bkr ¹1) trips at time - WR ¹195051 written to replace

WR ¹162319 TROUBLESHOOT SHEET Page 5 August 23, 1991 15.) Restart unit, as required, and put the load on UPS power.

16.) Open CB-1 on 2VBB-XD500 and verify that unit does not trip.

Unit did not trop Voltage difference alarm Maint out of limit alarm 17.) While on UPS power without maintenance available record the following:

UPS output voltage: Phase A: 118.8 VAC Phase B: 123.0 VAC Phase C: 120.2 VAC DC Link voltage: (as found) 135 VDC NOTE: WR ¹154535 written on (as left) 140.0 VDC 5/10/91 previous problem UPS output Frequency: 59.85 Hz 18.) 'lose CB-1 on 2VBB-XD600.

19.) Transfer loads to Maintenance.

20.) Open P-6 block on CB-4.

21.) Shut down unit including logic power.

22.) Open AC input breaker, 2VBS-PNL301, l.

23.) Measure each new battery prior to installing in UPSlA.

1.) 6.08 VDC 2.) 6.09 VDC 3.) 6.10 VDC 4.) 6.12 VDC 5.) 6.13 VDC 6.) 6.14 VDC

WR 8162319 TROUBLESHOOT SHEET Page 6 August 23, 1991 24.) Using a leads lifted log replace the control batteries in UPS1A.

25.) Measure battery voltage on each battery removed from UPS1A:

1.) 6.31 VDC 2.) 5.29 VDC 3.) 4.92 VDC 4.) 2.64 VDC 5.) 6.46 VDC 6.) 5.54 VDC 26.) Lift motor operator on CB-4.

27.) Reistall P-6 block on CB-4.

28.) Turn logic power on to UPSlA.

29.) Reset motor operator on CB-4.

30.) Restart UPS1A and put load on UPS power, CB-3 closed.

Supply breaker did not trip.

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WR g160944, troubleshooting plan, page 3 (8/26/91) 1.) Place the loads off UPS1B on maintenance power

• Visua1Ip'erify. that the static switch operates.

2.) Pull the P-6 block to CB-4

3. ) Open CB-2, CB-1, A27-S1.

4.) Measure and record DC logic power (this is battery voltage) 5.) Open A27-CB1.

6.) Measure voltage on A27-F4, term. g1 referenced to phase A, B and C of the maintenance supply: .

A27-F4 to Phase A: vh~

A27-F4 to Phase B: 0 0 vH~

A27-F4 to Phase C:

7.) Open AC input breaker, 2VBS-PNL301, 2.

8.) Measure each new battery prior to installing in UPS1B. pic 1.) <0)8 2-) 6l<8 3 )C.Ogq 4 )FOZ~-

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)f~ pq)',

9.) Using a leads lifted log replace the control batteries in UPS1B.

page 4 10.) Measure battery voltage on each battery removed from UPS1B:

11.) Lift motor operator on CB-4.

12.) Reinstall P-6 block on CB-4.

13.) Turn logic power on to UPS1B.

14.) Reset motor operator on CB-4.()<(

15.) Restart UPS1B and put load on UPS power, CB-3 closed. I I

I 16 ~ ) With loads on UPS power, open A27-Sl and verify no CONTROL BATTERY DISCHARGE alarm occurs.

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close $ 27-s1., '>>~g k;

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18. ) With loads on UPS poyer o en Cgy1 on 2VBB-XD601.

19. With loads on g (phys UPS 4) power q(QT~

without m5in enance available record

)

the following: ~

1 g.lI v Ac-pp UPS output voltage: @< Llo, l v Pc DC Link voltage: < 4.3 VJo.

UPS output Frequency:

r page 5 20.) Close CB-1 on 2VBB-XD601.

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WR ¹160946 TROUBLESHOOT SHEET Page 3 August 24, 1991 1.) Place the loads off UPS1G on maintenance power.

"Visually verify that the static switch operates.

2.) Pull the P-6 block to CB-4 3.) Open CB-2, CB-1, A27-S1.

Logic on- power supply failed, DC OV, Maint. out of limits, voltage diff output OV/UV, Inverter logic trip.

4.) Measure and record DC logic power - (this is battery voltage)

-20 VDC Batt. +0.69 VDC

+20 VDC Batt. +18.3 VDC 5.) Open A27-CB1.

6.) Measure voltage on A27-F4, term. ¹1 referenced to phase A, B and C of the maintenance supply:

A27-F4 to Phase A: 206.7 VAC A27-F4 to Phase B: 0.0 VAC A27-F4 to Phase C: 213.3 VAC 7.) Open AC input breaker, 2VBS-PNL301, 7.

8.) Measure each new battery prior to installing in UPS1G.

1.) 6.086 VDC 4.) 6.167 VDC 2.) 6.096 VDC 5.) 6.100 VDC 3.) 6.115 VDC 6.) 6.098 VDC

WR 8160946 TROUBLESHOOT SHEET Page 4 August 24, 1991 9.) Using a leads lifted log replace the control batteries in UPS1G.

Lead 256 to +20 VDC power supply had burnt log - screw was loose; other screws were tight, 10.) Measure battery voltage on each battery removed from UPSlG:

1.) +6.414 VDC 2.) +6.370 VDC 3.) +3.067 VDC 4.) +6.392 VDC 5,) +2 464 VDC 6.) +5.518 VDC 11.) Lift motor operator on CB-4.

12.) Reistall P-6 block on CB-4.

13.) Turn logic power on to UPS1G.

14.) Reset motor operator on CB-4.

15.) Restart UPS1G and put load on UPS power, CB-3 closed.

16.) With loads on UPS power, open A27-Sl and very no CONTROL BATTERY DISCHARGE alarm occurs.

No alarms or lights.

17.) Close A27-S1.

WR @160946 TROUBLESHOOT SHEET Page 5 August 24, 1991 18.) With loads on UPS power, open CB-1 on 2VBB-XD602.

Voltage difference, Maintenance out of limits alarms.

19.) With loads on UPS power without maintenance available record the following:

UPS output voltage: Phase A: 119.2 VAC Phase B: 121,6 VAC Phase C: 121.4 VAC DC Link voltage: 139.58 VDC UPS output Frequency: 59.91 Hz 20.) Close CB-1 on 2VBB-XD602.

313.367 R01 '30 DOCUMENTS NINE MILK POI>T NUCLEAII STATION CANTO 8S IIICO~~0 II~RIOT 10 Bf IIICCAPCRATII0 o 9~/T~MVPQAAAVIlOOISIQhTION a uAPMV aCCAW~'g0 iIACf 1 I aIIOT TO IR WCCHRXATKO, NOT TO QQ PO$ %0 CHA. AGED N2E35600IPW".UP001 2E a gJmMImaa/Z3TS~ OM Change UPS Logic Power Supply Q QXXREPZPZZCg CNLY This EDC is to change the Panel frcm the maintenance eauired ~r input for the UPS Logic Power aI'8 Relay supply (alternate 12OVAC pcwe") to the UPS invert output.

Technical Justification: 'Ihe use of the inverte output will prohibit transients on the mainten 1nce apply frcm az:Seating the Logic Pcker. 'Ihis change is reccmnended by Teide Electronics.

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I-

t page 1 Verify P-6 block open on CB-4 Verify logic power is off:

A27-CB1 open A27-S1 open

• CAUTION: RIGHT SIDE BUS CONNECTIONS ARE HOT INSTALL RUBBER BLANKETS.

Unplug the following plugs on A27:

0 1.) A27P3

~ 2. ) A27P4

" 3. ) A27P6 3

4.) A27P1 5.) A27P2

~ Remove A27 pan from unit Modify A27-K5 relay wiring per EDC Reinstall the A27 pan.

Reinstall following plugs:

1.) A27P3 2.) A27P4 3.) A27P6 4.) A27P1 5.) A27P2 Close A27-S1 (Leave A27-CB1 open) .

Verify mimic lights come on on the front panel.

Alarm horn will come in. (Reset as necessary)

page 2 Push relay A27-K5 in AND HOLD. Verify that lights go out.

Release relay A27-K5 and verify lights on.

I' 4 -'l +~ -

I

+i- 3>~

'-'ILES) come Re-energize the UPS on AC power, CB-2 open, with loads on maintenance.

Visually verify that, the A27-KS relay is energized.

Open A27-CB1.

Open the A27-Sl switch while monitoring A27-K5 and verify that the A27-K5 relay does not drop out.

Reclose A27-S1 and A27-CB1.

Lift the CB-4 motor operator.

Insert the P-6 block.

Reinsert the motor operator.

Close CB-2.

Transfer loads to UPS power and verify mimic lights are still on.

page 3 Transfer loads to maintenance power and verify that mimic lights are still on.

Place the transfer control switch in the AUTO RESTART position.

The unit will restart (after a time dealy) and retransfer to UpS powers

'I

~:- YORK:IN P" '36REsQ DATA SHEET::: .;:

a'R Z.v5 i5- <gKi A-8 I1ark No.

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REFERENCE DRAWINGS: (LISP BELOW) CteI1ENTS Prepared By Da<<:~/~ lech. Reviewer Ooio:~i~i>

Q This section N/A with No Plant Impact Reviewed with'Crew By: Supv/Chief Date: / /

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4 page 1 Verify P-6 block open on CB-4 Verify logic power is off:

A27-CB1 open A27-S1 open

• CAUTION: RIGHT SIDE BUS CONNECTIONS ARE HOT INSTALL RUBBER BLANKETS.

Unplug the following plugs on A27:

1.) A27P3.

2.) A27P4) 3 ~ ) A27P6 v

4. ) A27P1 g 5.) A27P2 ~

Remove A27 pan from unit:

Modify A27-K5 relay wiring per EDC Reinstall the A27 pan.

Reinstall following plugs:

1.) A27P3 2.) A27P4 3.) A27P6 4 ' A27P1 5.) A27P2 C lose A27-S1 (Leave A27-CB1 open).

Verify mimic lights come on on the front panel.

Alarm horn will come in. (Reset as necessary)

page 2 Push relay A27-K5 in AND HOLD. Verify that lights go out. '~~(

Release relay A27-K5 and verify lights come on. i C.Ml a-

~Psi~w ~c 4 ac, W'l'7 Ckf/

8~~J Re-energize the maintenance.

UPS on AC power, CB-2 open,2 i loads with oa s'on on Visually verify that the A27-K5 relay is energized.

ORen A27-CB1.

Open the A27-S1 switch while monitoring A27-K5 and verify that the A27-K5 relay does not drop out.

Reclose A27-Bl and A27-CB1.

Lift the CB-4 motor operator. pj)

Insert the P-6 block.

Reinsert the motor operator.

Close CB-2.

Transfer loads to UPS power and verify mimic lights are still on.

page 3 Transfer loads to maintenance power and verify that mimic lights, are still on. n Place the transfer control switch in the AUTO RESTART position.

The unit power.

vill restart (after a time dealy) and retransfer to UPS (Q

'I

...- . - -: .YORK lg PROGRESS DATA 9HEET-'. -.:. -...: .

St'n- I'L~O l~ wf~bo- uP~ig Permissible Reactor I'lode:

cl n" S I1ark No.

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Perry isslon Requested to 8 art y: Date. /QTtme-0 .

Permission Oranted to Start By: SSS Oat s gt trna:~Oe CSO Oats (A"Ai TIme:942.

llenotlllcations: 0 / S55 / C50 0 / SS5 / / SSS / CSO CONTINUED

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Prepared by. nate:M/M/& G Shellid Section hot'dan d with WA/Document on WA Technical Reviewer: ~

Date:X/W/ +< Remai'ks:..' '....

..: .. -:.:.:. Nnte: Thi below. sl jriaturi;. when slined,.

"- declares the equipaent operable af the

'-; ..-:::date hnd tlma spectfiid::.:-:.: '::

Reviewed by: '55S/S55'bate . / '.. ~

ji<ept0d Oy:......'I 55S l)ete: '/. /=, Time::

~l t l~l r,

IVIIE>>/L j /

U MOHAWK 5 GEE /Ebs pO) NT ff ) S I f 8" '

195012 ',

3. DEPARTMENT TO 00 WORK 4, PRIORITY OF WORK 5. UNIT: SI I ~2 gt/ITE

+Qs ELECTRICAL MAINTENANCE QI EMERGENCY 6. SYSTEM CODE T, COMPONENT NUMBEIT~XVFlX-<l SI<

QE QE Qs Qs MECHANICALMAINTENANCE INSTRUMENTATION & CONTROL DD URGENT((/DAY)

NECESSARY I(7 DAYS) r QE Qs COMPUTER QU Qs ISI QE AS TIME PERMITS I)7 DAYS) 18. SAFETY CLASS QSR QQ Pf'NSR QE Qs SECURITY I & C QE Qs FIRE Qt NEXT UNIT OUTAGE 19. FQ GYES PtJVO Qs Qs METER & TEST NEXT REFUELING OUTAGE 20. ASME COMPONENT 0 YES @40 QE Qs OTHER 21. CI EANNESS CLASS

9. EQUIPMENT TITLE

\

10. FAILURE DESCRIPTION AND LOCATION 11. NPRDS. SYMPTOM CODE 0 DESCRIPTION

-.-.:-"'.. 12. ORIGINATOR DATE + / ~ /

"".. l3. APPROVED'

~

.~

H DATEM /~+/Tl

/~/

14. W.R: RECEIVED.

15. PROCEDURE NOR / ~ ~~ " '

/

DATE""

/

'I~P" IN -" : '

DATE

/ ~,0 REQUIRED.

IB. tZOA NO11FIEDBYSUPV. O'A'NAME'7.

ACCOUNT. I I'I ' I I

7o =.o(

2Z QA REVIEW. QA

~; "-e ~4 2X'NSPECTION REOUIRED

~ I

'l YES

'I /~ IWT

"- .- - " ' / QPARTSEIPRQCEDUREGJORWGQMARKUPE3RWPONA~

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-24:.STAGEDBV .DATE ASSIGNED TO ' " ' ' ' ' OATEN'/ @ /Ll

2IE'NOTIRCATIONR OC OATS 27 CORRECTIVE ACTION

. TIME~

COBE'~ "

CÃfAT a>>i/Vi'.g~ DATE'rI /~/ ~

TIME/4SPI'.:

28: NPRDS CORRECTIVE'ACTION DESCRIPTION'cW

~~7 t  % ~ ~

P r

>>>> t

.-' 29. CAUSE OF FAII URE ~ 30. NPRDS FAILURE CODEgK9 OESSIIPTION ut QS

-::- 31. ATTACHMENTS 0 IDIAS

32. MARK UP NO'S2 MATERIALISSUES ES PROCEDURE CNECRUSTS RWP NO'S / /'CIR OINSPECTIONREPORTS NQ'S ~ ~ NCR r

33. CORRECTIVE ACTION COMPLETED NO'ATER

/~/

34. SUPERVISOR REVIEW. BY DATE~/~/ZC

~o 35. WORK ACCEPTED BY QA QNA DATE / 7 /

36. PMT REVIEW BY CIASSS/SSggUPV. DATE Z/~/~

~~~/

37. PMT PROCEDURE NO'S.

PMT COMPLETE VERIFIED BY I / / 0 PEAT TEST REPORT 0 NOT REOUIRGO 0 NA DATE~/ ~/~

39. ACCEPTED BY 0 SSS 0 SUPV. DATE / /

/s INST w O'YA

~r 40. NPRDS 0 NA SYSTEM CODE INIT. 41. INDEXED BY DOC. CONT. INIT.

OTS. ISO SYMSOI. IEIPMIIEIISS S2 OSS ISO/2 ~ SS

l1 page 1 Verify P-6 block open on CB-4 Verify logic power is off:

A27-CB1 open~g A27-S1 open 5' CAUTION: RIGHT SIDE BUS CONNECTIONS-ARE HOT INSTALL RUBBER BLANKETS'nplug the following plugs on A27:

1 ' A27P3 2.) A27P4 3.) A27P6

4. ) A27P

5. ) A27P2 Remove A27 pan from unit Modify A27-K5 relay wiring per EDC Reinstall following plugs:

1.)

2-)

A27P3 A27P4

~

3.) A27P6 4,) A27P1 5.) A27P2 Close A27-Sl (Leave A27-CB1 open). I Verify mimic lights come on on the front panel.

Alarm horn will come in. (Reset as necessary)

page 2 Push relay A27-K5 in AND HOLD. Verify that lights go out. b

.1 Release relay A27-K5 and verify lights come on.

Lift motor operator on CB-4'lug P-6 block in on CB-4 tor W~

Reattach motor er f'Nc C I Jg C.o C(4'~<4>4> on CB-4 P'(7 (gf. ~~a ~~a- egg 3~'~~

w4P. <4 0 VwIl f75 //P Pc+

4 c~,E the UPS s/~~7~r h~4 / ~~"~

i

~~F'e-energize 4 (~ M 2i ~ Z.4 i. MCC (C ng.V-lZ ~~

~) 6 J

~-a W4(M ~ ( p ug f

(/u/~r Visually verify that the A27-K5 relay is energized.

~~( ~ /

+/M tfL7~4 QI Open the A27-S1 switch while monitoring A27-K5 and verify the following:

a.) The A27-K5 relay does not drop out.

Reclose the A27-S1 switch.~~(o <>'7 ~Pi o/'~r egg (r

4-<

y ~

get c4,- Y 8- C Cg -y

@44(4'-

4(~~(f O~

With the UPS feeding the loads open A27-CB1.

Transfer loads to still on.

'ower ~ ~i/o~

and verify mimic lights are

f$ C/9/ page

~

3 w~i~ ~

Transfer loads to pover and verify that mimic lights 'are still on. ~iy ~ s ~i~

C ~,r mrL

~l fkyvf 53fl ~~ a ~ >rau+i Place A27-CB1 on. ~

l li L

4

. vfoRK lg PR06IIEss DATA'¹ppT.-':

>486 - KPS Ic f'ei missible Re.xtor I lode m Wit g l1ark No f'i ocedure 0 f/~ No.

QAII GHot Shutdown Q Otiier 0 EPN 0 Run QCold Shutdown Q Not Appllcabla Estimated Duration: QStart-up QRefuel DIV: 0 I 0 ll 0 ltl 0 0 Not Applicable (Equipment Out of Service)

HA Nark-up Required Yas 0 Ho EQUIPNENf II IPACT (LIST OUT OF SERYICE EQUIPNENT) PLANT INPACT (REQUIRES OPERATION'S INPUT)

REFERENCE DRAWINGS: (LIST BELOW) ONf1EHTS Prepared By Date: / 'lech. Aev lower Date:

hts s tl / with No P lant Impact Date:E/ / ~

Aevlewed with'Crew By: Supv/Chief Perraisslon Aequested to S Date:5/5/5 Tlute:4Z:/d Permtsston Granted to Start By: SSS By:

n t. I"rett:/ / /

lllcollons: D / SSS / CSO 0 / SSS cso~~'"'onol CSO CI SSS CSO C It HIVEl' BAG

~ os'A)NTNENgp, TFS]g .-

...

: PNT REQUIRED... ~sM o~~'.

TEST BEaUIAENENTS TEST 3ESUl TS PROCEDURES Defel I ed Performed By Yerifled By 0 No Step No.'s OW OYes ONo Step No.'s ONh GYes ONo GNa Step No.'s QWA GYes ONo G Set QNo Step No.'s O~ OYes OHo O Sat TESTS Test Acceptance Crt teria V Test OYes ONo O Test O Test 0 Test OYes GHo G Sat GYes GHo oI I ~

QYes OHo / /

Prepared by: ~ Date:LIBIM~ 0 ShIHod Section hei'4ael With WA/t? IcOeOnt en WR.

lechn teat Rev tewer: Date:4/ ~/M~ flbmal ks:

-Nbti:fhe below. at denature .when sfiroed.:

declares the equtpraant operable at the-

~ ~

. dale and lime s pactf tid::.: ..:

fteviewed by: ASSS/S5$ bale: J / $ >ept0d 9y: . '. - .. - - 558 90te: I. I . Itic:.: .

SARA NINE MILE MOHAWK

3. DEPARTMENT TO POINT 00 WORK 4. PRIORITY OF WORK r ia3i 5. UNIT: 01 g2 0 195013 g.

QL Qs Qs ELECTRICAL MAINTENANCE MECHANICALMAINTENANCE Q'MERGENCY Q2 URGENT((I DAY) oW 6.

7.

SYSTEM CODE COMPONENT NUMBER

'g Qs INSTRUMENTATION & CONTROL QI NECESSARY ((7 DAYS) 6. BIP NUMBER QL Qs COMPUTER QL Qs ISI ~ T E PERMITS {>7 DAYS) 18. SAFETY CLASS 0SR 00 ~SR QL Qs SECURITY I & C QL Qs FIRE UNIT OUTAGE 19. EQ 0 YES @NO QL Qs METER & TEST NEXT REFUELING OUTAGE 20. ASME COMPONENT 0 YES Qs

. NO QL Qs OTHER 21. CLEANNESS CLASS

9. EQUIPMENT TITLE:

10. FAILURE DESCRIPTION AND LOCATION 11. NPRDS. SYMPTOM CODE DESCRIPTION 5 Nn~

12. ORIGINATOR DATE&! / ~/

13. APPROVED DATE + / M /

14. W.FL RECEIVED DAT

/~'i "" '"

~ ~

16 0 QA NOTIFIED BY SUPV." 'DATE TIME QA NAME""'OT

/ ~ -.- C) REOUIRED T;w

'7. / ~

ACCOUNT-Wc7 .Y4 '--- -" -F4 I

'z~/~ I I I z-~o. cryo

' I JC 2 QA REVIEW QA. DATE'/~ cN

23. INSPECTION REQUIRED'-YES. ~O'" ~

1 '.TAGEDSY

-25. ASSIGNED

26. NOTIFICATIONS TO-

A QC'ATE

/'

'ATE~~

21. CORRECTIVEACTION"'.'26; NPROS. CORREDTIVEACTIONDOOEH

/ " 'IME

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'IPARTSC!PRQCEDURECIORWGTIMARRUPCIRWPCINA~

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DESCRIPTION SSS OAT~ 4

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29. CAUSE OF FAILURE 3K'NPRDS FAILURE CODE K8 DESCRIPTION h V ~

~, 0 ~ ~

31. ATTACHMENTS 0 MATERIALISSUES 0 PROCEDURE CHECKUSTS 0 INSPECTION REPORTS 0 LAS

.. 32: MARK UP NO'S /~ RWP NO'6 /' 'CIR NO'6 al w  ; NCR NO')wA4

~

33, CORRECTIVE ACTION COMPLE DATE~ /

34. SUPERVISOR REVIEW BY

35. WORK ACCEPTED BY QA ~A DATE 8 DATE /~/~

/ 7/

/

36. PMT REVIEW BY CIASSS/~SUPY. DATE >/ >C

'MT PROCEDURE NO'S. ~M/ L

/ 0 PMT TEST REPORT 0 NOT REOUIREO

38. PMT COMPLETE VERIFIED BY 0 NA DATE~/ ~/~~

39. ACCEPTED BY 0 SSS 0 SUPV. DATE / /

40. NPRDS 0 NA SYSTEM CODE INIT. 41. INDEXED BY DOC. CONT. INIT.

SIS ISB SYMBOL hUMBBR SS ~ 02 05S A09 SS

page 1 Verify P-6 block open on CB-4 Verify logic power is off:

A27-CB1 open

~

+

A27-S1 open

• CAUTION: RIGHT SIDE BUS CONNECTIONS ARE HOT INSTALL RUBBER ~

BLANKETS'nplug the following plugs on A27:

1 ' A27P3~

2.) A27P4+~

3.) A27P6 4.) A27P1 5.) A27P2 ~

Remove A27 pan from unit Modify A27-K5 relay wiring per EDC ~

Reinstall the A27 pan.

<~

Reinstall following plugs:

1.) A27P3

~

2.) A27P4 3.) A27P6 ~~

~

4 )

5.)

~ A27P1 A27P2 ~

Close A27-S1 (Leave A27-CB1 open).

Verify mimic lights come on on the front panel.. ~

Alarm horn will come in. (Reset as necessary)

page 2 Push relay A27-K5 in AND HOLD. Verify that lights go out.

Release relay A27-K5 and verify lights come on.

C,c.~>g C

< pS'~~

~2g ~~q ~ Cgl

~c sC < c. fY ~m~a Re-energize the UPS on AC power, CB-2 open, with loads on maintenance.

Visually verify that the A27-K5 relay is energized. +

Open A27-CB1.

Open the A27-S1 switch while monitoring A27-K5 and verify that the A27-K5 relay does not drop out.

Reclose A27-Bl and A27-CB1. ~

Lift the CB-4 motor operator.

insert the P-6 block.

Reinsert the motor operator. +

Close CB-2. ~

Transfer loads to UPS power and verify mimic lights are still on.

t' page 3 Transfer loads to maintenance power and verify that mimic lights are still on.

Place the transfer control switch in e AUTO REST position.

The nit will restart fter a time dea and retrans r to UPS power. g rJ - 3 )7+A )ceo 5W/c.~

I

.. posT.NAINTFNENGE:-TESTS::::.:-  :: PMT RFQlJIRED-.--. g Y<S: .. 0-TEST AEOU(AENENTS TEST '3ESUlTS PAOCEDUAES Deferred Sat Performed By Ver l fled By 0Nu Step No.'s OYes ONo 0 Sat Ste No.'s GYes QHo

..........................R..................................................................

0 No. Ste No.'s GYes QHo 0 Sat 0 No. Step No.'s QYes GHo N ~

TESTS Nr. 1 >'7lgglJyrgp Test Acceptance Crt teria 0 Test Q Yes Ho Sn Ll I- 0 Test K QYes QHo 0 Snt

'OC 0 Test K

Q.

0 Test 0 DY Dtl o8t~

QYes QHo Q Sat r

Prepared by: Date: ~ /M/9l .GShatied Section hot'Saeva with WA/Daciamlnt on WA Technical Aev lewer: Date:X/A/&< Remarks ~ ~ ~ ~ ~ ~ ~ ~ ~

.:.::: Note:-The heine. algnaturi;:i'lien.'lIned,

. declares the equipment operable af'the .

.: ..:::date and tlrria spectfjed::'..:::-'-:-: .:-..:

.4

)

Reviewed by: .

iSSSiSSS -Date'. i: i- hbCept0d 9y:......558 l70te: '/ / T line: '..

h

~

. WORK IN PR06REsQ.DATA leak'n LL~ Oi~ SHEET:'rricedure f'ei ~nissibie Re v.t~ r I Icde.

0 p¹ tlo.

Q All QHol Shutdown 0 Ottier Q Run QCold Shutdown 0 Not Applicable Estimated Duration: Q Slar t-up QAefuel OIY: Ql Q 11 Q Ill 0 M Q NotApplicable (Equipment Out of Service) clerk-up RequiredpAqe ClNo EQUIPNENf II1PACf (LIST OUT OF SERVICE EQUIPMENT) PLANT IMPACT (REQUIRES OPERATION'S INPUT)

REFERENCE DRAWINGS: (LIST BELOW) COI1t1EHTS d-AllR lhhksl gate. lech. Rev fewer Prepared By Tb s l n H/A with No Plant Impact Reviewed with'Crew By: Supv/Chtef Oate: / />

Perialsslon Requested to S art y- Date:E/ T tme~i Permission Granted to Start By: SSS Dais.2i@/2T 'lima: e/4:>M CSD >'aislo P lXP" Time CI / SSS / CSD Cl / SSS / Q'.'<'lsnoliiicallone:

CONT INl>¹O ON 8ACK

4

3. DEPARTMENT TO OO WORK QQS ELECTRICAL MAINTENANCE

4. PRIORITY OF WORK Q EMERGENCY

5. UNIT: 01

6. SYSTEM CODE Q Vg T Qi Qs MECHANICALMAINTENANCE Q2 URGENT I<1 OAY) 7. COMPONENT NUMBER%~V~(

~

Qi Qs INSTRUMENTATION & CONTROL QI NECESSARY (<7 DAYS) 8. BIP NUMBER Qi Qs COMPUTER Qi Ps ISI Qs 4@TIME PERMITS (>7 DAYS) 18. SAFETY CLASS QSR 00 IK(I)SR Qi Qi Qs Qs SECURITY I & C Qi Qs FIRE METER & TEST

+ UNIT OUTAGE NEXT REFUELING OUTAGE 19.

20.

EQ 0 YES I)QIO ASME COMPONENT 0 YES 2KNO Qi, Qs OTHER

21. CLEANNESS CLASS

9. EQUIPMENT TITLE:

10. FAILURE DESCRIPTION AND LOCATION 11. NPROS. SYMPTOM CODE CI

>c DESCRIPTION Zc e':

12. ORIGINATOR

13. APPROVED ~3 DATE PATE c8 2-/ 2 Z

/ ~ /~

/ Fj

14. W.R. RECEIVED

15. PROCEDURE NOS. / 2~I~4~ /

DATE~/~/~'

/ CI REQUIRED 0 QA NOTIFIED BY SUPV. - '.'~""..11ME 16- DA1'E '/ '

QA NAME

17. ACCOUNT I I

' ' ' ' I I I I I I

.i+'5 .',:.-. '-:g~ .-

.woo OA REVIEW QA DATE~'/~~~ ~+ 23'NSPECTIONREQUIRED': O:YES AWTIO I

'24 Sl'AGED BY ASSIGNEDTO B

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~ ~ ~ YI 26- NOTIPICATIONR QC. DATE 11ME DATE~/~2A E~ME NECE' 27' CORRECTIVE ACTION . 28. NPRDS CORRECTWEACT)CACOOE 'ESCRIPTION P~ k ZPVCM W /d Y,i \ ~

~ '.29. CAUSE OF FAILURE 30, NPROS FAILURE CODE CZ3 DESCRIPTION C CVY

~ r S l

31. ATTACHMENTS 0 MATERIALISSUES 0'PROCEDURE CH CRUSTS 0 INSPECTION REPORTS 0 LAS 0

32. MARK UP NO%/3J MEI/CZ RWP NO'S / ~ 4T'CIR NQ'S, NCR CORRECTIVE ACTION COMPLET BY OATW~

NO'3.

/~/

34. SUPERVISOR REVIEW BY DATE ~/~/~

35. WORK ACCEPTED BY QA 0 NA DATE E/MM/~

36. PMT REVIEW BY 0 ASSS/SSS~UPV. DATE~I~/~/

31 PMT PROCEDURE NO'S.~/P I / / 0 PMT TEST REPORT 0 2IOT REQUIRED

. PMT COMPLETE VERIFIEO BY 0 NA DATE +/ ~l ~ I

39. ACCEPTED BY 0 SSS 0 SUPV. DATE / /

I NIT

40. NPROS 0 NA SYSTEM CODE INIT. 41. INDEXED BY DOC. CONT. INIT.

BIB ISB SYMBOL IIUMBEASS ~ 22 0$ $ 409 ~ 8$

page 1 Verify P-6 block open on CB-4 Verify logic power is off:

l A27-CB1 open A27-S1 open

• CAUTION: RIGHT SIDE BUS CONNECTIONS ARE HOT INSTALL RUBBER BLANKETS'nplug the following plugs on A27:

1.) A27P3 2.) A27P4 3.) A27P6 4-) A27P1

5. ) A27P2 Remove A27 pan from unit Modify A27-K5 relay wiring per EDC Reinstall the A27 pan.

Reinstall following plugs:

1.) A27P3 2.) A27P4 3.) A27P6 4 )

~ A27P1 5.) A27P2 Close A27-Si (Leave A27-CB1 open).

Verify mimic lights come on on the front panel.

Alarm horn will come in. (Reset as necessary)

page 2 Push relay A27-K5 in AND HOLD. Verify that lights go out.Sit Release relay A27-K5 and verify lights come on.

C <~ e g>'a

~

I i'X~M ~C- E. Af Ry'fc ~~=~g aa

/

Re-energize the UPS on AC power, CB-2 open, with loads vn maintenance.

Visually verify that the A27-K5 relay is energized.

Open A27-CB1. p p Open the A27-S1 switch while monitoring A27-K5 and verify that the A27-K5 relay does not drop out.

Reclose A27-Sl and A27-CB1.

Lift the CB-4 motor operator.

Insert the P-6 block.

Reinsert the motor operator.I, Close CB-2.

Transfer loads to UPS power and veri'fy mimic lights are still on. (l~

page 3 Transfer loads to maintenance power and verify that mimic lights are still on. 5"p, Place the transfer control switch in the AUTO RESTART position.

The unit will restart (after a time dealy) and retransfer to UPS~ '<

power.

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. -:;: ~::: Ihl'ORK IN'PP. 9RESQ DATA 8HEET'-.:

fcf Wile l.~~i W VI g)1ark No.

E- ePSi(- See Procedure No.

Permi' QA)l Ule Re,z)or

) lode:

QHot Shutdown 0 Other .

Q EPN E'stimated Duration:

Q Run QCold Shutdown Q Not Applicable Q start-up QRefuel Ql Q II Q It)0 <A otAppllcable (Equ)ptnent Out of Service)

Mark-up Required pres Q Ho EQUIPMENr )nPAcr (LIST OUT OF Sf RY)CE Eau)PMENr) PLANT IMPACT (REQUIRES OPERATION'S INPUT)

REF ERENCE DRANINGs: (I.isr BE).ow) CoriNEHTS Prepared By Dale- I Tech. Rav iewel Date- /

0 f t ion NIA with No P lant I mpac Reviewed with'Crew By: Supv/Chio( OafeA/ /"

Pertaisslon Requested to St rt 8 . Dat: Time:Q:~

Permission Granted to Start By: SSS Date: hNTfme:~: CSO Date:~5/>i T)me:. ~~

Cennliflcallnna: CI / 55S / CSO 0 / SSS / CS / 555 /'" CSO CO)'lT INUED ON BACV

P08T:l1AlH7FNENGE:. TE8TS:::'.,".:

.  ::PAT. REQUIRED." oY<8 @No .

TEST REQUIREMENTS TEST RESUlTS PAOCEOUAES Deferred Sat Performed Sy Ver ifled By Q No. Step No.'s QYes GHo QNo Step No.'s DYes GHo QNo Step No.'s ONA OYes QHo 0 Sat QNo Step No.'s GYes GHo 0 Sat TESTS Test Acceptance Crt teria 0 lest 0 Yes Ho Sa't I- 0 Test aID QYes OHo 0 Sat Gf Ld 0 Test R

e OYes QHo 0 Sat 0;

0 Test QYes GHo 0 Sat Prepared by: Date: ~ /H/M~ QShiled section hot'4IIB with 1AtRIDoctsmbnt on WR 7 echni cat Reviewer: Date:X/+~/~~ Rema'res:

. '".':-Nnte: The below stgnaturi;:when slaned,.

declares the eguiptaent operab1e af'the .

.date and ttrria sjeelftid::-:.:-:

Reviewed by: . .

iSSSiSSS brie'.. i .i 5~ipted By: . - .'. - .. 5SS 00te:. /=/,-Tfme:-':

I UPS1A EFFICIENCY CALCULATIONS:

(8/91)

Input: Output:

Volts: Phase A: 600 ~

120 Phase B: 600 124 Phase C: 600 122 Amps: Phase A: 40 100 Phase B: 36 50 Phase C: 36 90 KW>=~I~ x Ex 1.73 x .f. (p.f. ~ = .8 9 full 1000 load) 1000 approx 1.0)

EFF = KW pUT KW ~ = 37.3 x 600 x 1.73 x .8 1000

= 30 '7 KW KW pUT 100 x 120 + 50 x 124 + 90 x 122 x 1. 0 = 29 18 ~ KW 1000 EFF = 29.18 ~94 ~ 2 30.97 Expected Eff: 82 4 9 1/2 load 84 4 9 full load

UPS1B EFFICIENCY CALCULATIONS:

(8/91)

Input: Output:

Volts: Phase A: 620 120. 5 Phase B: 610 122 Phase C: 600 121 Amps: Phase A: 48 95 Phase B: 44 75 Phase C: 46 90 KW ~ = ~I > x E x 1.73 x .f. (p.f. ~ = .8 9 full 1000 load) tl'000 approx 1.0)

EFF = KW ()~

KW ~ = 46 x 610 x 1.73 x .8 1000

= 38 '4 KW KW ()~ = 95 x 120.5 + 75 x 122 + 90 x 121 x 1.0 = 31 49 KW 1000 EFF = 31.49 81.11 38.84 Expected Eff: 82 4 9 1/2 load 84 4 9 full load

(<

UPS1C EFFICIENCY CALCULATIONS:

(8/91)

Input: Output:

Volts: Phase A: 605 119 Phase B: 600 120 Phase C: 600 122 Amps o Phase A: 90 180 Phase B: 84 160 Phase C: 86 165 KW ~ = ~I > x E x 1.73 x .f. (puff ~ = .8 9 full 1000 load) 1000 approx 1.0)

EFF KW KW ~ = 86.6 x 602 x 1.73 x .8 = 72 ~ 1S KW 1000 KW pUT '80 x 1 19 + 160 x 120 + 165 x 122 x 1 0 60 ~ 75 KW 1000 EFF = 60.75 72.15 84 '9 Expected Eff: 82 4 9 1/2 load 84 4 9 full load

V UPS1D EFFICIENCY CALCULATIONS:

(8/91)

Input: Output:

Volts: Phase A: 620 .121 Phase B: 610 119 Phase C: 605 121 Amps: Phase A: 74 135 Phase B: 70 155 Phase C: 70 ~

140 KW ~ = ~I > x E x 1.73 x .f. (p.f. > = .8 9 full 1000 load) 1000 approx 1.0)

EFF KW KW ~ = 71.3 x 612 x 1.73 x .8 = 60 ~ 39 KW 1000 KWo~= 135 x 121 + 155 x 119 + 140 x 121 x 1 0 = 51 73 KW 1000 EFF = 51.73 85.66 60.39 Expected Eff: 82 4 9 1/2 load 84 4 9 full load

\

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