RC-11-0050, 2010 Annual Operating Report

2010 Annual Operating Report

ML110940028
Person / Time
Site:	Summer
Issue date:	03/31/2011
From:	Gatlin T South Carolina Electric & Gas Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RC-11-0050, RG 1.016
Download: ML110940028 (9)

Text

Thomas D. Gatlin Vice President,Nuclear Operations 803.345.4342 SCE&G A SCANA COMPANY March 31, 2011 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ANNUAL OPERATING REPORT Enclosed is the 2010 Annual Operating Report for the South Carolina Electric & Gas Company Virgil C. Summer Nuclear Station Unit No. 1. This report is being submitted in accordance with Technical Specifications 6.9.1.4 and Regulatory Guide 1.16.

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

Very truly yours, Thomas D. Gatlin SBR/TDG/wm Attachment c: K. B. Marsh M. L. Thomas S. A. Byrne K. M. Sutton J. B. Archie D. L. Abstance N. S. Cams E. Everett J. H. Hamilton Marsh USA, Inc.

R. J. White NRC Resident Inspector W. M. Cherry NSRC V. M. McCree RTS (LTD 292)

R. E. Martin File (818.02-10, RR 8225)

REIRS Project Manager PRSF (RC-1 1-0050)

/ý-Od Virgil C.Summer Station - Post Office Box 88 -Jenkinsville, SC. 29065

• T(803) 345-5209

VIRGIL C. SUMMER NUCLEAR STATION 2010 ANNUAL OPERATING REPORT

Document Control Desk LTD 292 RC-1 1-0050 Page 2 of 8 PREFACE The 2010 Annual Operating Report for the Virgil C. Summer Nuclear Station is hereby submitted in accordance with Technical Specifications 6.9.1.4 and Regulatory Guide 1.16 under Docket Number 50/395 and Facility Operating License NPF-12.

Document Control Desk LTD 292 RC-1 1-0050 Page 3 of 8 TABLE OF CONTENTS SECTION TITLE PAGE 1.0 Introduction 4 2.0 Operational Data 4 3.0 Operating Summary 4 4.0 Exposures 6 5.0 Failed Fuel 6 ATTACHMENTS

1. 2010 Man-Rem Report

Document Control Desk LTD 292 RC-1 1-0050 Page 4 of 8 ANNUAL OPERATING REPORT

1.0 INTRODUCTION

The Virgil C. Summer Nuclear Station (VCSNS) utilizes a pressurized water reactor rated at 2900 MWT. The maximum dependable capacity is 966 MWe.

The station is located approximately 26 miles northwest of Columbia, South Carolina.

2.0 OPERATIONAL DATA For the reporting period of January 1 through December 31, 2010, the station operated at a capacity factor of 100.3% (using maximum dependable capacity) and a unit availability of 99.1%. The reactor was critical for a total of 8709.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, the generator remained on line 8681.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and the total gross electrical energy generated for 2010 was 8,822,600 MWH.

3.0 OPERATING

SUMMARY

The Virgil C. Summer Nuclear Station (VCSNS) Unit No.1 operated at 100% power from January 1st through February 4 th. On February 4 th the plant was taken offline to repair the switchyard disconnect 8901. Reactor power was restored to 100% on February 6 VCSNS operated at 100% power from February 6 th to April 2 nd. On April

, power was reduced to approximately 86% to resolve an emergent issue in the Emergency Feedwater System. Reactor power was restored to 100% on April 2 . VCSNS operated at 100% reactor power from April 2 nd to April 23r when power was reduced to approximately 90% to perform the quarterly main turbine tests and planned maintenance to tune the feedwater regulating valves and perform 230 kV line work. Power was restored to 100% on April 24th.

VCSNS operated at 100% power from April 2 4 rd to June 1 st. On June 1st, reactor power was reduced to approximately 88% due to a "C" Feedwater pump trip which was caused by a failed Hydraulic Servo Slave (HSS) card.

The failed HSS card was replaced and the leaking inboard seal on the "D" Feedwater Booster Pump was also repaired during the down power.

Reactor power was restored to 100% on June 3 rd.

Document Control Desk LTD 292 RC-1 1-0050 Page 5 of 8 VCSNS operated at 100% power from June 3rd to July 3 0 th. On July 3 0th, reactor power was reduced to 90% to maintain the circulating water discharge temperature under 113 degrees F for National Pollutant Discharge Elimination System (NPDES) permit compliance. Reactor power was restored to 100% on August 4th.

VCSNS operated at 100% power from August 4th to August 13th. On August 13th reactor power was reduced to approximately 96% to maintain the circulating water discharge temperature under 113 degrees for NPDES permit compliance. Reactor power was restored to 100% on August 1 5th.

VCSNS operated at 100% power from August 15th to August 2 2 nd when power was reduced to approximately 95% to maintain the circulating water discharge temperature under 113 degrees for NPDES permit compliance.

Reactor power was restored to 100% on August 27th.

VCSNS operated at 100% power from August 2 7 th to September 2 3 rd. On September 2 3 rd, the plant was taken offline to repair the "A" reactor coolant pump motor oil leak. The repair was completed and reactor power was restored to 100% on September 2 6 t. The plant operated at 100% power for the remainder of 2010.

Forced Power Reduction >20% Exceeding 4 Hours On February 4th, the plant was taken offline to address an issue with a Disconnect Switch (XDS8901) on the main outgoing power line. While performing a routine surveillance with a thermography camera, a technician noted a high temperature condition on the center phase of this 230KV switch. Additional investigation indicated that the center phase contact was not fully seated in the switch "jaws!'. The consequence of this switch opening under load would have been a large arc flash which could have caused significant damage to switchyard components, and posed a threat to plant personnel. The main generator was synchronized to the grid on February 5th at 1214 hours0.0141 days <br />0.337 hours <br />0.00201 weeks <br />4.61927e-4 months <br />. Reactor power was restored to 100% on February 6 th at 1453 hours0.0168 days <br />0.404 hours <br />0.0024 weeks <br />5.528665e-4 months <br />. This outage did not result in any single release of radioactivity or single radiation exposure that accounted for more than 10% of the allowable annual values. The duration of the down power was approximately 17.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.

On September 2 3 rd, the plant was taken offline to repair a motor oil leak on "A" Reactor Coolant Pump. The reactor returned to criticality on September 2 5 th at 0655 hours0.00758 days <br />0.182 hours <br />0.00108 weeks <br />2.492275e-4 months <br />. The main generator was synchronized to the grid on September 25th at 1526 hours0.0177 days <br />0.424 hours <br />0.00252 weeks <br />5.80643e-4 months <br />. Reactor power was restored to 100% on

Document Control Desk LTD 292 RC-1 1-0050 Page. 6 of 8 September 2 6 th at 1057 hours0.0122 days <br />0.294 hours <br />0.00175 weeks <br />4.021885e-4 months <br />. This outage did not result in any single release of radioactivity or single radiation exposure that accounted for more than 10% of the allowable annual values. The duration of the down power was approximately 60.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

4.0 EXPOSURES Attachment I lists the number of station, utility, and other personnel (including contract personnel) receiving exposures greater than 100 mrem/year and their associated man-rem exposure according to work and job function. The exposures reported are estimated doses based on electronic dosimeters.

5.0 FAILED FUEL VCSNS did not have any indications of failed fuel in 2010.

Document Control Desk LTD 292 RC-1 1-0050 Page 7 of 8 ATTACHMENT I TO 2010 ANNUAL REPORT

Document Control Desk LTD 292 RC-1 1-0050 Page 8 of 8 South Carolina Electric & Gas Company V. C. Summer Nuclear Station Personnel and Man-Rem by Work and Duty Function Regulatory Guide 1.16 Annual Report for 2010 Number of Personnel Over 100 mRem Total Man-Rem Work and Job Function Station Utility Contract Station Utility Contract Workers Workers Workers Workers Workers Workers Inservice Maintenance Engineering Personnel 0 0 0 0.000 0.000 0.000 Health Physics Personnel 0 0 0 0.000 0.000 0.000 Maintenance Personnel 0 0 0 0.000 0.000 0.000 Operations Personnel 0 0 0 0.000 0.000 0.000 Supervisory Personnel 0 0 0 0.000 0.000 0.000 Reactor Operations & Surveillance Engineering Personnel 0 0 0 0.003 0.000 0.000 Health Physics Personnel 0 0 0 0.060 0.000 0.000 Maintenance Personnel 0 0 0 0.240 0.000 0.011 Operations Personnel 0 0 0 0.093 0.000 0.005 Supervisory Personnel 0 0 0 0.002 0.000 0.000 Refueling Engineering Personnel 0 0 0 0.000 0.000 0.000 Health Physics Personnel 0 0 0 0.000 0.000 0.000 Maintenance Personnel 0 0 0 0.000 0.000 0.000 Operations Personnel 0 0 0 0.000 0.000 0.000 Supervisory Personnel 0 0 0 0.000 0.000 0.000 Routine Maintenance Engineering Personnel 0 0 0 0.003 0.000 0.047 Health Physics Personnel 0 0 0 0.357 0.000 0.000 Maintenance Personnel 1 0 0 1.315 0.000 0.346 Operations Personnel 0 0 0 0.303 0.000 0.050 Supervisory Personnel 0 0 0 0.004 0.000 0.001 Special Maintenance Engineering Personnel 0 0 0 0.000 0.000 0.000 Health Physics Personnel 0 0 0 0.000 0.000 0.000 Maintenance Personnel 0 0 0 0.000 0.000 0.000 Operations Pefsonnel, 0 0 0 0.000 0.000 0.000 Supervisory Personnel 0 0 0 0.000 0.000 0.000 Waste Processing Engineering Personnel 0 0 0 0.000 0.000 0.000 Health Physics Personnel 0 0 0 0.300 0.000 0.002 Maintenance Personnel 0 0 0 0.008 0.000 0.000 Operations Personnel 0 0 0 0.001 0.000 0.000 Supervisory Personnel 0 0 0 0.009 0.000 0.000 Total Engineering Personnel 0 0 0 0.006 0.000 0.047 Health Physics Personnel 0 0 0 0.717 0.000 0.002 Maintenance Personnel 1 0 0 1.563 0.000 0.357 Operations Personnel 0 0 0 0.397 0.000 0.055 Supervisory Personnel 0 0 0 0.015 0.000 0.001 Grand Total 1 0 0 2.698 0.000 0.462