ML20209H985
| ML20209H985 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 04/24/1987 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 2NRC-7-092, 2NRC-7-92, TAC-62917, NUDOCS 8705040166 | |
| Download: ML20209H985 (4) | |
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M 2NRC-7-092 Be r Valig No. 2 Unit Project Organization Telecopy 4 )
2 Ext.160 P.o. Box 328 Apri1 24, 1987 Shippingport, PA 15077 United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
SUBJECT:
Beaver Valley Power Station Unit No. 2 Docket No. 50-412 SER Confirmatory Item 34 Voltage Analysis -
Verification of Test Results NUREG-0800, PSB-1 Gentlemen:
The Emergency Bus Voltage Analysis Test and evaluation of results has been completed.
The network of a string of buses and the Class 1E and non-Class 1E motors selected for the test are shown in the attachment.
AC System Verification tests were performed on a string of buses originat-ing from the 138KV offsite power supply down to and including a 120/240V Class 1E panelboard.
This string was selected because it showed the lowest analyzed voltages at critical 120V loads.
The steady state portion of the te.;t was conducted with a minimum of 30%
loading at each bus level.
The motor starting transient portion of the test was conducted by first starting a Cooling Tower Pump (2CWS-P21A) followed by starting a Class 1E Service Water Pump (25WS*P21A) with 2CWS-P21A still running.
The measured loading recorded during these tests was then entered into the analytical program to calculate bus voltage levels.
The calculated bus voltage levels were then compared to the actual voltage measurements recorded during the test.
This comparison showed good correlation with the measured test val-ues never being more than 3 percent lower than the calculated results as required by PSB-1. The percentage differences are summarized here:
8705040166 870424 DR ADOCK 05000412 PDR
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United States Nuclear Regulatory Commission SER Confirmatory Item 34 Voltage Analysis - Verification of Test Results Page 2 Percentage Difference in Bus Voltage Levels V(%) = V(%) measured - V(%) calculated 4.16kV 4.16kV 4.16kV 480V 480V 240V Cases Bus 2A Bus 2B Bus 2AE Bus 2N MCC Bus PNL Bus All steady -1.16
-1.6 0.10
-0.50 0.15 0.16 state conditions 2CWS-P21A
-0.56
-1.29 1.13 1.91 1.55 1.70 1
start (2SWS*P21A off) 2SWS*P21A 0.36
-1.66 2.09 1.46 2.27 2.35 start (2CWS-P21A running) i Note:
Voltage (%) = Voltage in kV/ Base kV Voltage.
The differences observed, in percent, were then imposed onto the analyti-cal results, demonstrating that voltage levels at Class 1E equipment were never less than the minimum required for those loads.
Adjusted Bus Voltages are summarized here:
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United States Nuclear Regulatory Commission SER Confirmatory Item 34 Voltage Analysis - Verificaiton of Test Results Page 3 l
Adjusted Bus Voltages V Base Bus No V Adjusted (%)
V required (%)
4.16KV 508 (motor) 88.3 80 (motor start) 4.16KV 503 (motor) 82.3 80 (motor start) 480V 574 (motor) 77.5 73 (motor start) 480V MCC*2-E05 91.8 91.7 (steady state)
This testing meets the intent of NUREG-0800, PSB-1, item 4 in that it proves the validity of the analytical model utilized to predict voltage extremes in the AC power system.
Since the same modeling techniques were used for the balance of the AC power system, and redundant strings are designed in the same manner, results of testing another string could be expected to corre-late satisfactorily.
Because the measurements taken correlate with the analytical models, BVPS-2 complies with BTP PSB-1. DLC considers this matter closed.
l DUQUESNE LIGHT COMPANY By QL J. J. Carey v
Senior Vice President AND/ijr NR/AND/ITM/34 Attachment AR/NAR cc: Mr. P. Tam, Project Manager
- w/ attachment Mr. J. Beall, NRC Sr. Resident Inspector
- w/ attachment Mr. L. Prividy, NRC Resident Inspector
- w/ attachment INP0 Records Center
- w/ attachment
ATTACHMENT TESTED BVPS-2 NETWORK a
AND INSTRUMENT CONNECTIONS
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