ML19260C091

Forwards Review & Analysis of Station Electrical Distribution Sys.Review & Analysis Confirmed Adequacy of Offsite Power Sys & Onsite Distribution Sys

ML19260C091
Person / Time
Site:	Farley
Issue date:	12/11/1979
From:	Clayton F ALABAMA POWER CO.
To:	Gammill W Office of Nuclear Reactor Regulation
References
NUDOCS 7912180542
Download: ML19260C091 (8)

Text

-* . Alaoama Power Company 600 North 18th Street Post Office Box 2641 Birmingham, Alabama 35291 Telephone 205 3215M1 No c Pr sid nt OO O E the southern electnc sg em December ll, 1979 Docket No. 50-348 Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Attn: Mr. William Gammill

Dear Mr. Gammill:

ADEQUACY OF STATION ELECTRICAL DISTRIBUTION SYSTEMS VOLTAGES Enclosed is Alabama Power Company's response to your letter of August 8,1979 requesting a review of the adequacy of station electrical distri-bution systems. The review and analysis confirmed the adequacy of the off-site power system and onsite distribution system.

If you have questions, please advise.

Yours very truly,

^ - _^

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_ J- '

em n a h4A -

F. L. Clayton, Jr. .

FLCJr/TNE:bhj Enclosure cc: Mr. R. A. Thomas Mr. G. F. Trowbridge

/

h"$ r 1609 211 7912180 S N

ENCLOSURE The analysis consisted of the following:

A. Determination of the worst case anticipated transient condition and

1. calculation of the steady state voltages prior to the transient.

2. calculation of the voltage conditions during the transient.

3. calculation of the steady state voltages after the transient.

B. Determination of the anticipated light load condition, and calculation of the maximum expected voltages for this condition.

C. Verification of the analytical method used for calculating voltage drops by test.

The single line diagram depicting the worst case anticipated transient condition is shown on the attached sketch entitled " Case A-2". The postulated conditions for this case are as follows:

1. Unit Auxiliary Transformers l A and 18 are out of service for Unit 1 and Unit 1 is operating at full power with all required auxiliary loads connected to Startup Auxiliary Transformers l A and 1B prior to the transient.

2. The transient condition which subsequently occurs consists of:

a. LOCA - resulting in simultaneous start of all required LOCA loads.

b. Unit auxiliary running loads remain on buses.

c. Starting of 3,000 hp Condensate Pump ittor coincident with the start of LOCA loads.

d. Unit 2 is in the Emergency Shutdown condition.

3. The 230 KV switchyard is at the minimum expected voltage based on grid stability analysis before, during, and after the transient.

The voltage results of the computer analysis performed for " Case A-2" are shown on the attached voltage profiles, Sketch SKE-1002, Rev.1, Sheets 1 and 2, for the steady state condition prior to the transient, for the transient condition, and for the steady state condition after the transient. For the 600 volt and 208 volt systems, the voltage drops were computed for the worst Load Center and Motor Control Center distribution network based on loading and distance of cable routing.

The results of the computer analysis depicting the voltages at the instant of simult'a neous motor starting are shown on voltage profile SKE-1002, Rev.1, Sheet 2, (Case A3). As shown on voltage profile SKE-1002, Sheet 2 (Case A3), all motor 1609 212

terminal voltages are above the minimum momentary motor starting voltage and running voltage of 75% and the motor contactor pickup voltage of 71% for safeguard motors. The voltage-time settings for the 4.16 KV Emergency Bus Undervoltage (loss of voltage) relays have been selected to avoid separation of the safety buses from offsite power during the transient conditions postulated.

The calculated steady state voltages on the distribution system prior to the start of the LOCA loads and Condensate Pump Motor, and the steady state calculated voltages on the distribution system after the LOCA loads and the Condensate Pump Motor are running are shown on SKE-1002, Rev.1, Sheet 1. The steady state motor terminal voltages before and after the motor starting transient are above 90% of the continuous voltage rating of the safeguard motors. For the steady state conditions, the voltage-time settings of the 4.16 KV Emergency Bus Undervoltage (Degraded Voltage) relays have been selected to avoid separation of the safety buses from offiste power.

The single line diagram for the anticipated light load condition is shown on the attached sketch entitled " Case C". The postulated conditions for this case are as follows:

1. Unit 1 is on post-LOCA after Plant Shutdown with lighting and HVAC loads running.

2. Unit 2 is in the refueling mode with lighting and HVAC loads running.

3. The 230 KV Switchyard is at the maximum expected voltage based on grid stability analysis.

The voltage results of the computer analysis performed for " Case C" are shown on the attached voltage profile sketch SKE-1000, Sheet 3. The motor terminal voltages for all safeguard motors are within 110% of the continuous voltage

' rating of the motors.

A test was performed at Farley Nuclear Plant Unit 1 to verify ,that the analytical method used for calculating the voltage cases described above is valid. A 7,000 hp Circulating Water Pump Motor connected to 4.16 KV Bus 1B was started, and the voltage on the high voltage side of Startup Auxiliary Transformer 1B and the voltage on 4.16 KV Bus 1B were recorded for the motor starting condition.

The transformer low voltage winding which supplies the 7,000 hp motor was unloaded prior to the motor starting test. This test case was modeled on the voltage drop computer program, and the calculated voltage on 4.16 KV Bus 1B at the instant of motor starting was within 0.3% of the measured bus voltage for this condi tion. Therefore, the computer program provides satisfactory results.

Based on the results of the analysis described above, it can be concluded that the Farley station electric distribution system is of sufficient capacity and capability to automatically start and operate all required safety loads within their required voltage ratings for the anticipated transient and steady state conditions assuming all onsite sources of AC power are not available.

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