ML20097F541

Monthly Operating Rept for May 1992 for VC Summer Nuclear Station

ML20097F541
Person / Time
Site:	Summer
Issue date:	05/31/1992
From:	Haltiwanger J, Skolds J SOUTH CAROLINA ELECTRIC & GAS CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9206150352
Download: ML20097F541 (6)

Text

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Stuth Cathne ElectHC & Gas Comptny John L. Skolds P.O Box 68 Vee Ptstid*nt Jennonsyme. Sc 290$$

Nuclest Operstens (803) 3454 040 t

SCE&G

-l June 10,1992 i

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Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555 Attention: Director, Office of Resource Management

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Gentlemen:

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Subject:

VIRGIL C. SUMMER NUCLEAR STATION DOCKET NO. 50/395 OPERATING LICENSE NO. NPF-12 1

MAY MON 1HLY OPERATING REPORT.

Enclosed is the May 1992 Monthly Operating Report for the Virgil C. Summer-Nuclear Station Unit No. 1.

This submittal is made in accordance with.the requirements of Technical Specifications, Section 6.9.1.10.-

j If there are any questions, please call me at your convenience.

-f Very truly yours, i

-John L. Skolds.

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NUCLEAR EXCELLENCEl A SUMMER-TRADITION!

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I Director, Office of Resource Managemont May Monthly Operating Report Page 1 ATTAC!! MENT 1 AVERAGE DAILY UNIT POWER LE*/EL DOCKET NO.

50/395 UNIT V. C. SUMMER I DATE 6/ 2/92 COMPLETED BY J. W.

HALT!WANGER TELEPHONE (803) 345-4297 MAY 1992 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL (MWe-Net)

(MWe-Het) 1.

890 17.

-24 2,

889 18.

~37 3.

890 19.

-37 4.

889 20.

-35 5.

890 21.

-35 6,

889 22.

50 7.

890 23.

521 8.

889 24.

882 9.

890 25.

885 10, 890 26, 887 11.

867 27.

888 12.

22 28.

890 13.

-24 29.

888 14.

-16 30.

889 15.

-15 31.

887 16.

-17 s

l Director, Office of Resource Management May Monthly Operating Report Page 2 ATTACHMENT !!

OPERATING DATA REPORT DDCKET NO.

50/395 UNIT V. C. SUMMER !

DATE 6/ 2/92 COMPLETED BY J. W.

HALTIWANGER TELEPHONE -(503) 345-4297 OPLRATING STATUS

1. Reporting Period May 1992 Gross Hcurs in Reporting Period 744-

2. Currently Authorised Power Level (MWt):

2775 Ham. Depend, Capacity (MWe-Met):

885 Jesign Electrical Rating (MWe-Net):

900-

'3.

Power Level to Which Restt icted (If Any)(MWe-Met) - N/A 4 Reasons for Restrictions._ N/A THIS MONTH YR TO DATE CUMULATIVE

5. Number of Hours Reactor Critical 513.1 3416.1.

58040.7 6.. Reactor Reserve Shutdown Hours 0.0 0.0 0.0

7. Hours Generator on Line 492.6 3395.6 56883.3

8. Unit Reserve Shutdown Hours 0.0 0.0 0.0

9. Gross Thermal Energy Generated (MWH)- 1314957 9252816 147821583-

10. Gr'oss Electrical Energy (MWH) 438430 3099000 48984399

11. Net Electrical Energy Generated (MWH) 413060 2965347 46512629-

12. Reactor Service Factor 69.0 93.7 18.7

13. Reactor Availability Factor 69.0 93.7 78.7 14.. Unit Service Factor 66.2 93.1 77.1

15. Unit Availability Factor 66.2

'93.1 77.1

16. Unit Capacity Factor (Using MDC) 62.7 91.

71.2

17. Unit capacity Factor-(Design MWe) 61.7 90.3 70.1

18. Unit Forced Outage Rate 0.0 0.G 6.4

19. Shutdowns Scheduled Over Next 6 Months (7ype,- Date & Duration-of Each):

NOME

- 20. If Shut-Down at End of Report Period, Estimated Date of Startup:

N/A

21. Units in Test Status (Prior to Commercial Operation):

N/A 3.

-(

Director, Office of Resource Management May Monchly Operating Report Page 3 ATTACHMENT III UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO.

50/395 UNIT

f. C. SUMMER I DAT5 6/ 2/92 COMPLETED 8Y J. W. HALTIWANGER TELEPPJNE (803) 345-4297 MAY 1992 NO.

DATE TYPE DURATION REASON NETHOD CORRECTIVE ACTION /COKMENTS 2 920512 S

251.4 A

1 REPAIR S/G MANWAY STEAM LEAK 1.0 REASON As Equipment Failure B: Maintenance or Test C Refueling Di Regulatory Restriction El Operator Training and License Examination F Administrative G Operational Error H: Other (Explain) 2.0 METHOD 1: Manual 2: Manual Scram 3: Automatic Scram 4: Continuation (Use initial Date) 5: Power Reduction (Duration 0.0)

9. Other (Explain) m

Director Office of Resource Management May Monthly Operating Report Page 4 ATTACHHENT IV NARRATIVE

SUMMARY

OF OPERATING EXPERIENCE DOCKET NO.

50/395 UNIT V. C. SUMMER 1 DATE 06/02/92 COMPLETED BY J. W. HALTlWANGER TELEPHONE (803) 345-4297 MAY 1992 Virgil C. Summer Nuclear Station operated at approximately 100% power for the first 10 days of May.

Power was reduced on May 11 to repair a secondary steam leak on a "B" steam generator manway. The main generator breaker was opened at 0418 on May 12 Mode 3 was entered at 0600..The plant was cooled down to Mode 5.

During this shutdown, several moisture separator reheater tubes were plugged.

On May 20 at 0415 hours0.0048 days <br />0.115 hours <br />6.861772e-4 weeks <br />1.579075e-4 months <br />, the plant entered Mode 2.

During troubleshooting of a power range drawer, the power to a intermediate range channel sharing a common power supply was momentarily interrupted. The reactor tripped from approximately 3% power.

On May 21 at 0008 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, the plant again entered Mode 2. _In preparation for connecting the generator to the grid, with feedwater (FW) temperature at 250*F and decreasing, reactor power was increased to approximately 30% with the steam dump to the condenter in order to maintain FW flow above the minimum 13% FW isolation setpoint (FW isolation occurs when FW temperature is less than 225'F with flow less than 13%). While the turbine was rolling up, the main steam power operated relief valves (PORV) cycled open and closed several times due to main steam system overpressure. As a result of the PORV oscillations. FW flow to "C" SG decreased below 13%, and before it recovered to greater than the 17% low flow reset, FW temperature dropped below 225'F causing FW isolation to "C" SG. An attempt to reduce power to shift FW to the-SG to.EFW system was made but "C" SG. level fell below the lo SG 1evel reactor trip setpoint before this could be accomplished, and a reactor trip occurred from 9% power. Subsequent testing revealed that the main condenser dump valves were'not opening fully; the valve controls were repaired.

On May 22 at 0947 hours0.011 days <br />0.263 hours <br />0.00157 weeks <br />3.603335e-4 months <br />, the reactor was taken critical. The main generator breaker was closed at 1542 hours0.0178 days <br />0.428 hours <br />0.00255 weeks <br />5.86731e-4 months <br /> that day.

The plant operated at approximately 100% power from May 24 through the end of the month.

l O

^

MISCELLANEOUS OPERATING STATISTICS THRU May 1992 VIRGIL C SUMMER NUCLEAR STATION, UNIT 1 OPERATING STATUS Currently Authorised Power Level (MWt):

2775 Max. Depend. Capacity (KWe-Net):

885 Design Electrical Rating (MWe-Net):

900 Gross Maximum capacity (MWe):

930 Gross Dependable Capacity (HWe):

921 L2FE FISCAL YEAR 12 MONTH 3 MONTH OF PLANT TO DATE TOTALS TOTALS Number of Hours Reactor Critical 65373,5 6504.7 7224.7 1976.1 Reactor Reserve Shutdown Hours 0.0 0.0 Hours Generator on Line 63882.7 6313.3 7033.3 l?55.6 Unit Reserve Shutdown Hours 0.0 0.0 Gross Thermal Energy Generated (HWH) 162432110 16915547 18888872 5284513 Gross Electrical Energy (KWH) 53764909 5661400 6323190 1766380 Net Electrical Energy Generated (MWH) 51005355 5396943 6032099 168A935 Reactor Service Factor 78.2 80.7 Reactor Availability Factor 78.2 80.7 Unit Service Factor 76.4 78.3 Unit Availability Factor 76.4 78.3 80.1 88.6 Unit Capacity Factor (Using MDC) 68.9 75.6 77.6 86.4 Unit Capacity Factor (Design MWe) 67.8 74.4 Unit Forced Outage Rate 6.7 0.8 0.7 Forced Outage Hours 4567.3 50.8

$0.8 0.0 Scheduled Outage Hours 15167.0 1699.9 1699.9 251.4 Equipment Forced Outages 2

0 Equivalent Unit Derated Hours

• 478.29 302.10 Equivalent Seasonal Derated Hours

• 41.99 11.7)

Equivalent Availability Factor

• 74.1 74.4 Equivalent Unit Derated Hours

• for Month:

270.1 Equivalent Seasonal Derated Hours

• for Month:

4.8 Equivalent Availability Factor

• for Month:

29.3 Equivalent Availability Factor

• for 36 months:

80.6 Year-to-Date Equivalent Availability Factor *:

84.3 Equipment Forced Outages per 1000 Critical Hours:

0.277 Equipment Forced Outages Year-to-Date:

0 Total Forced Outages Year-to-Date:

0

• Based on INPO Detailed Descriptions of Overall Performance Indicators and Other Indicators - December 1987 g

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