ML20151U886

Forwards Addl Info Re Design of Plant Electrical Distribution Sys,Per 880627 Request

ML20151U886
Person / Time
Site:	Byron
Issue date:	08/05/1988
From:	Lentine F COMMONWEALTH EDISON CO.
To:	Murley T Office of Nuclear Reactor Regulation
References
NUDOCS 8808190289
Download: ML20151U886 (8)

Text

-

} Byron NuclearStation C mmonwmith Edison i

l

..' 4450 North German Church Road V

Byron, Illinois 610to August 5, 1988 Mr. Thomas E. Mutley Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Cournission Mail Station PI-137 Washington, D.C. 20555

Subject:

Byron Station Units 1 and 2 Loss of Offsite Power - Request for Additional Information

Reference:

June 27, 1988 Letter From L. Olshan to H. Bliss The referenced letter requested additional information concerning the design of the electrical distribution system at Byron Station. The attachment to this letter provides the requested information.

1 Sincerely yours, F. G. Lentine PWR Licensing Supervisor Attachment ec: Byron Resident Inspector L. N. Olshan - NRR (0947z/ll) 0l f0

' i y p$8190289e80805ADOCK 05000454 PDC

SARGENT O LUNDY

"" SM5 ATTACHMENT *A" Byron /Braidwood Units 1 & 2 NRC Let~ter Dated June 27,1988 Loss of Offsite_ Power FoHowup Request _ for Additional Information d

The enclosure in the subject NRC letter states that "both units normally operate from their unit auxiliary transformers. One of two offsite sources feeding through each unit's SAT serves as the normal immediate access feed to the ESF divisions of that unit; each unit's SAT then can provide the second source of power fo the other unit through its ESF buses by operator action (delayedaccess)

The above NRC statement indicates a misunderstanding of the Byron /Braidwood Auxiliary Power System configuration and design (e.g., the Class IE buses do not normally operate from the unit auxiliary transformers but from the system,

auxiliary transformers). Therefore,;in the interest of clarifying the

o Byron /Braidwood design prior to addressing the concerns raised by the NRCM P are first providing a brief ' description of the 4160V Class 1E Auxiliary Power System followed by the requested information regarding the ratings of the Class IE 4160V buses and main breakers.

1.

Descrioti_on_ of _41_60V Class IE Auxiliary Power System Figure 1 is a simplified single line diagram of the 4160V Auxiliary Power Systea installed at Byron /Braidwood Stations Units 1 & 2.

There is no provision for feeding a Class IE 4160V bus from a Unit Auxiliary Trans former (VAT).

The controls for the tie breakers between the Class 1E and non-Class 1E bures (i.e., breakers 1411,1421, 2411, and 2421;i4 "..

Figure 1) are interlocked so that they may be manually closed to provide diesel-generator power to selected non-1E loads) only when (a)(the VAT r m and SAT breakers of the non-1E bus are open, and (b) the class 1E bus unit cross-tie breakers are open (e.g., breakers 1431,1432,and1414,h' must all be open in order to close Breaker 1411).

In each case, power is rupplied to the 4160V Class 1E bus either (normally) by the associated System Auxiliary Transformer (SAT) of the unit, by automatic transfer to the diesel-generator upon loss of the SAT, or by manual transfer to the second source of offsita power (i.e., the associated SAT of the other unit) through the 4160V Class IE switchgear cross-tie breakers.

Each pair of SATs is sized to provide the total auxiliary power for;ong unit, plus the Class 1E auxiliary p(ower for the other unit.

In addition,;

each of the twc SATs is available through the 4160V Class IE switchgearS cross tie breakers) to all safety-related loads of one division for both' O units and, therefore, serves as the second source of offsite power to' theh '

other unit.

~

The Byron and Braidwood Class 11 Auxiliary Power System design meets the requirements of General Design criterion 17, 1

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a160V $witchgear Bus and._ Breaker Ratings The continuous current rating of each 4160V switchgear bus / breaker is 1200 amperes.

This rating is sufficient to carry the total coincidental load imposed on that bus by one unit in a normal full load operating mode, plus the total coincidental Class 1E lo3d imposed on that bus by the other unit in a normal, accident or safe shutdown mode.

The worst case Load Condition for the sunario described in the NRC letter would be represented by a loss of Coolant Accident (LOCA) on Unit 1 (Bus 141) and a "Winter" Full Load Condition on Unit 2 (Bus 241) at Syron Station.

Based on the Byron Station Electrical Load Monitoring System (ELMS), the following is the load Surmary for this load Condition (reference Figure 2, Pages 1, 2, and 3):

t A. 4160V Switchgear Bus 141 - Conditio'n' #5 (LOCA)

~

Full 1.oad Maximum Current Equipment No.

Load Description Brake HP or_ kVA PF(%)

Eff. (11 ( Amperes)

ISX01PA-M Essential Service 1143 HP 90.0 95.0 13BA Water Pump 1 A IS101PA Safety injection 405 HP 93.0 93.0 4BA

+ Pump.1 A

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1CV01PA Centrifugal Charging 660 HP 92.0 94.0 79A PG.) 1A iCS01PA-M Containment Spray 507 HP 93.0 93.0 61A Pump 1 A 1 AF01PA-M Auxiliary Feedwater 1165 HP 89.0 94.0 144A Pump 1 A OVA 01CA Auxiliary Building 291 HP 85.0 94.0 38A Ventilation System Supply Fan OA 1RH0lPA Res dual Heat Removal 400 HP

'J 2. 0 85.0 53A

'i' P0mp 1 A ICC01PA Component Cooling 390 HP 92.0 93.0 47A Pump 1 A OVA 02CA Auxiliary Building 429 HP 92.0 92.0 52A Ventilation Systen r h.w.6 r.

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CARGENT O LUNDY "IN[AE '

A. 4160V switchaear Bus 141 - Condition #5 (LOCA) (continued)

Full Load Maximum Current Equipment No.

Load Description Brake HP or kvA PF (%) Eff. (%)

(kperes) 0W901CA Control Room 345 HP 89.0 94.0 43A Refrigeration Unit 0A 480V Bus 131X 752 kVA 104A 480V Bus 131Z 431 kVA 6_0A Total Mperes =

867A

'i B. 4160V Switchaear Bus 241 - Condition #3 (Full Load Winter)

Full Load Current Equipment No.

Load _Desc_rtption_

Brake HP or kVA PF (%)

Eff. (%)

(Mpe_resl OVA 01CC Auxiliary Building 291 HP 85.0 94.0 38A Ventilation System Supply Fan OC 2CC01PA Component Cooling

;390 HP 92.0 93.0 47A Pump 2A OVA 02CC Auxfliary Building 429 HP 92.0 92.0 52A Ventilation System Exhaust Fan OC 480Y Bus 231X 548 kVA 76A 47A 480V Bus 2312 338 kVA Total Mperes =

260A Based on the aboYe, the maximum continuous load that will be seen by the 4160V Class 1E switchgear (Bus 241) and main breaker (2412) under this operating condition is 867A + 260A = 1,127 amperes.- This is below the switchgear bus and breaker continuous current rating of 1200A.

Therefore, "each ESF bus and the breaker feeding to the ESF bus from the startup traasformer are also rated to carry the auxiliary loads of one unit and the ESF loads of the other units,"

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Byron /Braidwood Units 1 & 2 Explanation of Load Conditions Used on EIRS 7

Load Condition 1 = Connected Continuous Load j

Load Condition 2 = Pull Load (Summer)

Load Condition 3 = Full Load (Winter)

Load Condition 4 = Start Up Lead Condition 5 = LOCA i

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