ML20059L034

Forwards Addl Station Blackout Info Re Diesel Loading & Alternate Ac Analysis,Per 900404 Meeting.Info Will Be Helpful When Evaluating Unit O Diesel Generator cross-tie Mod

ML20059L034
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	09/20/1990
From:	Chrzanowski R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9009260082
Download: ML20059L034 (12)

Text

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i Commonwealth Edison l

/, 34X) Opus Place i

. 8

/ Downers Cr;ve,Illin:Is 60515 September 20, 1990 Documont Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 i

Subject:

Eion Station Units 1 and 9 Additional Station Blackout Information On Diesel Loading and Alternate AC Analysis HEC _.DAChtL.RQad.0-21 Land 50-304 Gentlemen:

During a meeting held on April 4, 1990, between Commonwealth Edison l

and the NRC questions arose regarding Station Blackout information on diesel k

generator loading for Zion Station.

This information will also be helpful when evaluating the Unit "0" diesel generator cross-tie modification that was discussed at the meeting.

The following information is provided fran the Station Blackout Analysis Report for Elon Station.

1)

Diesel Generator Loading Evaluation Thi purpose of this evaluation was to determine if emch diesel generator at Zion Station is adequately sized to bring the Station safely to a hot standby condition.

Table 9-1 identifies the particular diesel, bus, loading, efficiency and margin.

L 2)

Alternate AC Analysis The purpose of this analysis is to evaluate the Alternate AC response of Elon Station to a station blackout utilizing diesel generater "0" as the Alternate AC source for the blacked out unit. This analysis identifies the blackout out unit, DG 0, major components, manual actions, processes not available and miscellaneous issues.

(Table 3-5 and 3-6),

3)

Distribution of ECCS Loads on EST Buses This attachment contains information from the Electric Lvad Monitoring System (ELMS) detailing the loacings of each diesel generator in Kilowatts rather than horsepower and the percentage of load based on rated capacity of the diesel generator.

This data indicates adequate diesel capacity with significant reserve.

Please direct any further questions regarding this matter to this uffice.

Very truly yours I,

R.A.

hrzanows i Nuclear Lice sing Administrator cc:

Zion Resident Inspector C.

Patel - NRR Region III Office ENLD:ID-293 90092600i32'900920 PDR ADOCK 05000295 P

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9.2 Diesel Generator Loading 9.2.1 Obiective t

The purpose of this analysis was to determine if each diesel generator at Zion Station is adequately sized to safely bring the station to a hot standby condition.

The results of f

this analysis are used in section 2 of this report to determine the station's Emergency AC' Power Configu.ation Group as defined in Regulatory Guide 1.155 TaLle 3.

9.2.2 Evaluation This evaluation was performed to verify that arch diesel l

generator is sized adequately to bring the unit to hot standby when utilizing only the minimum safe shutdown equipment.

For each diesel genera' tor, Diesel Loading Table 8.4.2-1 from the Updated Final Safety Analysis Report was used to determine the bus loading during shutdown.

The summation of each bus load was determined and compared to the diesel generator loading capabilities.

Even, utilizing a

relatively conservative efficiency factor of 90% it was found that each diesel generator is adequately sized to supply the loads required for a station blackout event.

Table 9-1 of this report provides the loading assessment and ensures that each diesel is adequately sized to support it's required loads.

9.2.3 Conclusion The information in Table 9-1 presents the reyuired support documentation which confirms that any one diesel can

i supply the required power te safely shut down the unit to a hot standby condition.

This information was incorporated into Sections 3 and 4 of this report to determine the minimum EDG assessment and Alternate AC capability for the station.

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i TABLE 9-1 ZION STATION Loading of Diesel Generators for Station Blackout j

,e lL DG 0 Bus 147 Maximum Minimum Total i

Primary Loads BHP Each Recuired BHP l

Charging Pump 600 1-600

. Component Cooling..

.300 1

300 Water Pump-e Service Water Pump 1500 1

1500

\\

480V Auxiliary' Transformer 1730 1

1730 i

Total BHP on Diesel 4130 Total Motor Output = (.746)x(BHP) 3081'kW Total Motor Input 0 90% Eff.

3423 kW DG Rating 4000 kW

^'

DG Margin 577 kW l

Bus 247 Maximum Minimum Total Primary Loads BHP Each Required BHP-

)

Charging Pump 600 1

600 Service Water Pump 1500 1

1500 480V Auxiliary Transformer 1471 1

1471 Total BHP on Diesel 3571 J

Total Motor Output = (.746)x(BHP) 2663 kW Total Motor Input 0 90% Eff.

2959 kW DG Rating 4000 kW DG Margin 1041 kW t

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Page 1 of 3

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s DG 1A Bus 148 Maximum Minimum Total Primary Loads BMP Each Required BH7f_

Safety Injection Pump 400 1

400 Component Cooling Water Pump 300 1

300 Service Water Pump 1500 1

1500 480V Auxiliary Transformer 2505 1

2505 Total' BHP on Diesel 4705 Total Motor Output = (.746)x(BHP) 3500 kW Total Motor Input 9 90% Eff.

3899 kW DG Rating 4000 kW DG Margin 101 kW DG 1B Bus 149.

Maximum Minimum Total Primary Loads BMP Each Required BHP

)

Charging Pump 600 1

600 1

Component Cooling Water Pump 300 1

300 Service Water Pump 1500 1

1500 480V Auxiliary Transformer 1721 1

1721 Total BHP on Diesel 4121 i

Total Motor Output = (.746)x(BHP) 3074 kW-Total Motor Input 9 90% Eff.

3416 kW DG Rating 4000 kW DG Margin 584 kW Page 2 of 3 n

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-l DG 2A Bus 248 Maximum Minimum Total

)

Primary Loads BHP Each Reauired BHP j

i Safety Injection Pump 400 1

400 j

Component Cooling Water Pump 300 1

300 Service Water Purap 1500 1

1500 480V Auxiliary Transformer 2194 1

2194 Total BHP on Diesel 4394 Total Motor Output = (.746)x(BHP) 3278 kW Toici Motor Input 9 90% Eff.

3642 kW l

JG Rating 4000 kW DG Margin 358 kW DG 2B Bua 249 Maxintim Minimum Total Primary Loads BHP Each Required BHP Charging Pump 600 1

600 Component rooling Water Pump 300 1

300 Service Water Pump 1500 1

1500 480V Auxiliary Transformer 1853 1

1853 w

Total BHP on Diesel 4253 Total Motor Output = (.746)x(BHP) 3173 kW Total Motor Input 9 90% Eff.

3525 kW DG Rating 4000 kW DG Margin 475 kW Page 3 of 3

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TABLE 3-5

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ZION STATION UNIT 1 ALTERNATE AC ANALYSIS Available Diesel DG 0 l

1).

Maior~ Components to be Utilized Charging Pump 1B (1VC007)

Service Water Pump 1A (1SWOO1).

Component Cooling Water Pump OE (OCC007)

Turbine-Driven Auxiliary Feedwater Pump 1A (1FWOO4)

Diesel Generator 0 povering 4kV ESF. Bus 147 Steam Ge'nerator 1A for decay heat removal 2)

Local Manual Action (s) o Open access.and cabinet / panel doors in the Main Control Room and' Auxiliary Electric Equipment Room (if Unit 2 l

Diesel Generator 2B is not available).

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o. Manually close either 1MOV-SWO100 or 1MOV-SWO115 to 1

isolate service water to Turbine Building.

s-o Locally cross-tie de bas 011-2 (OLP52) to de bus 111 (1CB63) to provide long-term RCS cold leg temperature

]

(Teold) indication.

Avpb e

o Within four

ho6rs, establish CST level indication or transfer AFW pump suction to service water.

The TDAFW pump requires local operation of 1MOV-SWO102 and 1MOV-FW0075 to. provide suction from service water.

1 3)

Processes Not Available o

Remote CST level indication o

Control Room and AEER HVAC (assuming additional single failure in Unit 2) 4).

Miscellaneous Issues

. o Control Room and AEER HVAC could be s'upplied from Unit 2, Diesel Generator 2B 4 o A Unit 2 exhaust fan should be utilized for Auxiliary Building ventilation (total of two are required).

Either diesel generator from Unit 2

can supply power to the required exhaust fan.

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i TABLE 3-6 i

ZION STATION UNIT 2 ALTERNATE AC ANALYSIS 1

)

i Available Diesel-DG 0 1

1)

Maior Components to be Utilized Charging ~ Pump 2B (2VC007) i Service Water Pump 2A (2SWOO1)

Turbine-Driven Auxiliary Feedwater Pump 2A (2FWOO4)

Component Cooling Water. Pump C or D (Unit 1) f Diesel. Generator 0 powering 4kV ESF Bus 247 l

Steam Generator 2A for decay heat removal l

2)

Local Manual Action (s) o Open access and cabinet / panel doort in the Main Control Room (if Unit 1 Diesel Generator 1A is not available).

o Open access and cabinet / panel doors in the Auxiliary Eleictric Equipment Room (if Unit 1 Diesel Generator 1B v.

's.'

is not available).

l o

Manually close either 2MOV-SWO100 or 2MOV-SWO115 to isolate service water to Turbite Building.

o Locally cross-tie de bus 011-1 (OLP51) to de bus 211 (2CB63) to provide long-term RCS cold leg temperature (Teold) indication, o

Within four' hours, establish CST level indication or transfer AFW pump suction to. service water.

The TDAFW pump requires local operation of 2MOV-SWO102 and 2Mov-FWOO75 to provide suction frra service water.

3)

Processes Not Available o

Rerote CST level indication o

Control Room or AEER HVAC (assuming additional single I

failure in Unit 1) i i

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9 TABLE 3 cor.tinued

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ZION STATION UNIT 2 4)

Miscellaneoie Issues o

AEER HVAC could be supplied from Unit 1, Diesel Generator 1B o

component cooling water will be supplied from a Unit 1 CCW pump (OCC005 or OCC006) o Control Room HVAC could be supplied from Unit 1, Diesel Generator DG 1A o

A Unit 1 exhaust fan should be utilized for-Auxiliary Building ventilation (total of two are required).

Either diesel generator from Unit 1

can supply power to the required exhaust fan.

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DISTRIBUTION OF ECCS LOADS ON ESF BUSES with KW LOAD AND % GENERATOR RATING i

UNIT 1 l

L-D/G 0 D/G 1A D/G 1B Bus 147 Bus 148 Bus 149' Chg 18 396.0 CS IB 373.8 Chg 1A' 396.0 1

l SW IA 948.6 SW IB 948.6 SW IC 948.6 1^

j SI 1A 287.5~

SI IB 287.5

-RHR 1A.

270 1

CS 1A 373.8 RHR IB 270 AFW IC 406 CC-OE 217.5 AFW IB 406 CC OC 217.5 480V XFMR 313.0 CC OD 217.5 480V XFMR-611-480V XFMR 781.0 TOTAL 2536.4 KW 3284.4 KW 2849.1 KW j

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% OF GEN RATED J

1 63.4%

82.1%

71.2%

i GENERATOR-RATING = 4000KW 1

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DISTRIBUTION OF ECCS LOADS ON ESF BUSES with KW LOAD AND % GENERATOR RATING l

UNIT 2 D/G 0 D/G 2A D/G 28 j

I Bus 247 Bus 248 Bus 249 i

Chg 2B 396.0 CS 28 373.8 Chg 2A 396.0 SW 2A 948.6 SW 28 943.6 SW 2C 948.6

.SI 2A 287.5 SI 2B 287.5 RHR 2A 270 t

CS 2A to373.8 RHR 2B 270 AFW 2C 406 i

AFW 2B 406 CC OA 217.5 480V XFMR 301.0-CC OB 217.5 480V XFMR 587 480V XFMR 779.0 TOTAL 2306.9 KW 3282.4 KW 2825.1 KW

% OF GEN RATED l

t 57.6%

82.1%

70.6%

i GENERATOR RATING - 4000KW

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