ML18086B724

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Annual Operating Report
ML18086B724
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 03/27/2018
From: Lippard G
SCANA Corp, South Carolina Electric & Gas Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML18086B724 (7)
v • d • e


Text

George A. Lippard Vice President, Nuclear Operations 803.345.4810 March 27, 2018 A SCANA COMPANY U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Dear Sir/Madam:

Subject:

VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 DOCKET NO. 50-395 OPERATING LICENSE NO. NPF-12 ANNUAL OPERATING REPORT Enclosed is the 2017 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 Specification 6.9.1.4.

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

SBR/GAL/bb Attachment c: J. E. Addison J. C. Mellette W. K. Kissam C. Logan (ANI)

J. B. Archie Marsh USA, Inc.

J. H. Hamilton NRC Resident Inspector W. M. Cherry NSRC G. J. Lindamood RTS (LTD 292)

C. Haney File (818.02-10, RR 8225)

S. A. Williams PRSF (RC-18-0032)

K. M. Sutton V. C. Summer Nuclear Station

  • P. 0. Box 88
  • 2906S
  • F (803) 941-9776
  • www.sceg.com

VIRGIL C. SUMMER NUCLEAR STATION UNIT 1 2017 ANNUAL OPERATING REPORT

Document Control Desk LTD 292 RC-18-0032 Page 1 of 5 PREFACE The 2017 Annual Operating Report for the Virgil C. Summer Nuclear Station Unit 1 is hereby submitted in accordance with Technical Specification 6.9.1.4 under Docket Number 50/395 and Facility Operating License NPF-12.

Document Control Desk LTD 292 RC-18-0032 Page 2 of 5 TABLE OF CONTENTS SECTION TITLE PAGE 1.0 Introduction 3 2.0 Operational Data 3 3.0 Operating Summary 3 4.0 Failed Fuel 5

Document Control Desk LTD 292 RC-18-0032 Page 3 of 5

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, 2017, the station operated at a capacity factor of 81.7% (using maximum dependable capacity) and a unit availability of 80.8%.

The reactor was critical for a total of 7125.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />, the generator remained on line 7078.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and the total gross electrical energy generated for 2017 was 7,190,539 MWH.

3.0 OPERATING

SUMMARY

VCSNS Unit No.1 operated at 100% power from January 1st through April 4th. On April 4th power was reduced to 85% to support main steam safety valve testing. The unit remained at 85%

power through April 7th when the unit was taken off-line to begin Refueling Outage Twenty-Three (RF-23). The main generator breaker was opened on April 8th at 0121 hours0.0014 days <br />0.0336 hours <br />2.000661e-4 weeks <br />4.60405e-5 months <br />. The outage was completed on June 1st at 1159 hours0.0134 days <br />0.322 hours <br />0.00192 weeks <br />4.409995e-4 months <br /> when the main generator breaker was closed. Power was restored to 100% on June 4th.

VCSNS operated at 100% power from June 4th to June 29th. On June 29th the plant was automatically shutdown. The shutdown resulted from a loss of feedwater flow to "B" Steam Generator caused by a spurious closure of "B" loop feedwater flow control valve. The main generator breaker was opened on June 29th. The solenoid valve was replaced and the main generator breaker was closed on July 1st. Reactor power was restored to 100% on July 2nd.

VCSNS operated at 100% power from July 3rd to August 28th. On August 28th the plant shutdown automatically. The main generator breaker opened on August 28th. The shutdown resulted from a main transformer lockout caused by failure of the high side middle phase lightning arrestor. The apparent cause was moisture intrusion into the arrestor that caused a fault. The arrestor and high side bushing were replaced. The main generator breaker was closed on September 8th. Reactor power was restored to 100% on September 9th.

VCSNS operated at 100% power from September 9th to November 7th. On November 7th the plant automatically shutdown. The main generator breaker opened on November 7th. The shutdown was caused by Inverter XIT05905 failing to swap-over to alternate supply which resulted in a loss of control power to feedwater pump digital control cabinets. Main feedwater pumps tripped causing a turbine trip and reactor trip. Reactor power was restored to 100% on November 11th. The plant operated at 100% power for the remainder of 2017.

Document Control Desk LTD 292 RC-18-0032 Page 4 of 5 Refueling Outage 23 Summary The main generator breaker was opened on April 8th at 0121 hours0.0014 days <br />0.0336 hours <br />2.000661e-4 weeks <br />4.60405e-5 months <br />. The outage duration was scheduled for 58 days. The main generator breaker was closed on June 1, 2017 at 1159 hours0.0134 days <br />0.322 hours <br />0.00192 weeks <br />4.409995e-4 months <br />.

Major work included:

  • Reactor Vessel Head Replacement
  • Reactor Vessel Head Service Structure Replacement
  • Emergency Feedwater "A" Train Cured in Place Pipe (CIPP)
  • Emergency Feedwater Recirculation Orifice Phase 2
  • Fukushima FLEX modifications Refueling Outage 23 duration was 54 days 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> and 38 minutes. Personnel exposure in 2017 due to the outage was approximately 42.247 Rem.

Forced Power Reduction >20% Exceeding 4 Hours On June 29th the plant shutdown automatically. The shutdown resulted from a loss of feedwater flow to "B" Steam Generator caused by a spurious closure of "B" loop feedwater flow control valve. The main generator breaker opened on June 29th. The solenoid valve was replaced and the main generator breaker was closed on July 1st. 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 total outage duration was 18.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

On August 28th the plant shutdown automatically. The main generator breaker opened on August 28th. The shutdown resulted from a main transformer lockout caused by failure of the high side middle phase lightning arrestor. The apparent cause was moisture intrusion into the arrestorthat caused a fault. The arrestor and high side bushing were replaced. The main generator breaker was closed on September 8th. 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 total outage duration was 257.6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

On November 7th the plant shutdown automatically. The main generator breaker opened on November 7th. The shutdown was caused by Inverter XIT05905 failing to swap-over to alternate supply which resulted in a loss of control power to feedwater pump digital control cabinets. Main feedwater pumps tripped causing a turbine trip and reactor trip. The main generator breaker was closed on November 10th. 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 total outage duration was 59.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

Document Control Desk LTD 292 RC-18-0032 Page 5 of 5 4.0 FAILED FUEL VCSNS did not have any indications of failed fuel in 2017.

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