ML20195G166

Monthly Operating Repts for May 1999 for Ehnp Units 1 & 2. with

ML20195G166
Person / Time
Site:	Hatch
Issue date:	05/31/1999
From:	Beard M, Sumner H SOUTHERN NUCLEAR OPERATING CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
HL-5795, NUDOCS 9906150255
Download: ML20195G166 (7)

Text

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. Lewis Summer Southern Nuclear

.9~ Vic) President Operating Company,Inc.

Hatch Project Support 40 invemess Parkway Post Office Box 1295 Birmingham. Alabama 35201 Tel 205.992.7279 Fax 205.992.0341 SOUTHERN h COMPANY Energy to Serve YourWorld*

June 11, 1999 Docket Nos. 50-321 50-366 HL-5795 U.S. Nuclear Regulatory Commission A'lTN: Document Control Desk Washington, D. C. 20555 Edwin 1. Hatch Nuclear Plant

! Monthly Operatina Reports Ladies and Gentlemen. i l

I l Enclosed are the May 1999 Monthly Operating Reports for Edwin 1. Hatch Nuclear Plant Unit 1, Docket No. 50-321, and Unit 2, Docket No. 50-366. These reports are submitted in accordance l with Technical Specifications 5.6.4.

Respectfully submitted, 42 1 H. L. Sumner, Jr.

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Enclosures:

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1. May Monthly Operating Report for Plant Hatch Unit I /

2. May Monthly Operating Report for Plant Hatch Unit 2 cc: Southern Nuclear Operatina Company l Mr. P. H. Wells, Nuclear Plant General Manager SNC Document Management (R-Type A02.001)

U. S. Nuclear Reaulatorv Commission. Washincton D. C.

Mr. L. N. Olshan, Project Manager - Hatch gh

\.)h . U. S. Nuclear Regulatory Commission. Region 11

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, Mr. L. A. Reyes, Regional Administrator Mr. J. T. Munday, Senior Resident luspector - Hatch Utility Data Institute. Inc.

Ms. Barbara Lewis - McGraw-liill Companies 9906150255 990531 ADOCK 05000321 3

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Enclosure I Plant Hatch Unit 1 Monthly Operating Report May 1999 {

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Table of Contents Page Operating Data Report El-1 i Unit Shutdowns and Power Reductions El-2 I

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OPERATING DATA REPORT Docket No.: 50-321 Unit Name: E.1. Hatch Unit 1 Date: 6/3/99 Completed By: Macon Beard Telephone: 212) 367-7781 x2878 Operating _ Status

1. Reporting Period: MAY 1999

2. Design Electrical Rating (Net MWe): 822.1

3. Maximum Dependable Capacity (Net MWe): 787 This Montb Year To Date Cumulative

4. Number of Hours Reactor Was Critical: 724.9 2,285.7 161,026.0

5. Hours Generator On Line: 700.6 2,116.7 155,434.3

6. Unit Reserve Shutdown Hcurs: 0.0 0.0 0.0

7. Net Electrical Energy Generated: 507,142 1,621,427 109,665,584 CHALLENGES TO MAIN STEAM SAFETY / RELIEF VALVES Date Tag No. Event Description No challenges this month.

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UNIT SHUTDOWNS Docket No.: _50 321 Unit Name: E. l. Hatch Unit 1 Date: 6/3/99 Completed By: Macon Beard Telephone: (912) 367-7781 x2878 Reporting Period: MAY 1999 Type Method of F: Forced Duration Shutting Cause/ Corrective Actions No. Date s: scheomo (Hours) Reason (1) Down (2) Comments99-002 990429 F 3.8 A 4 investigation into the cause of the Auto Voltage Regulator not responding properly continued. A blown fuse was replaced and the unit was successfully tied to the grid.99-003 990501 S 1.8 B 5 The Main Generator was removed from the grid for Turbine Overspeed Trip Testing.99-004 990507 F 37.8 G 3 The unit experienced an automatic reactor scram on high reactor pressure when the turbine control valves drifted closed due to a loss of EHC system pressure.

(continued below)

(1) Reason: (2) Mt1 HOD A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Trip / Scram C-Refueling 3-Automatic Trip / Scram D-Regulatory Restriction 4-Continuation E-Operator Training / License Examination 5-Other (Explain)

F-Administrative G-Operational Error (Explain)

H-Other (Explain)

CAUSE/ CORRECTIVE ACTION / COMMENTS:

99-004 (continued) The loss of EHC system pressure was caused by a Plant Equipment Operator closing a system supply valve while running a clearance for replacement of an out of service system fluid filter.

NARRATIVE REPORT Activities associated with the 18th Refueling Outage continued into the month of May. Shift tied the unit to the line on May 1 and began power ascension and testing activities associated with Extended Power Uprate. The "B"  ;

Circulating Water Pump was removed from service on May 3 to replace a damaged motor bearing. The unit

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Experienced an automatic reactor scram on May 7 due to personnel error (see description of event 99-004 l for details). The unit was retumed to service on May 8 and activities for power ascension and uprate testing I I

continued. The unit entered Extended Power Uprate operating conditions on May 12 and attained the new rated thermal power of 2763 MWth on May 20. Shift performed a minor load reduction to 2730 MWth late on May 20 to address a high bearing temperature alarm on the "A" Reactor Feed Pump. The unit was returned to )

rated thermal power on May 22. Shift also performed a load reduction to approximately 55% of rated on May 30 to perform a rod pattem adjustment, remove the "B" Reactor Feed Pump from service for repair of a leak on the seal water line, and repair oil leaks on the "B" Condensate Booster Pump. The unit was retumed to rated thermal power operation on May 31. Shift maintained operation at rated therrnal power for the rest of the month.

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l Enclosure 2 Plant liatch Unit 2 Monthly Operating Report May 1999 q

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Table of Contents )

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Operating Data Report E2-1  !

Unit Shutdowns and Power Rufuctions E2 2 1

OPERATING DATA REPORT Docket No.: 50-366 Unit Name: E.1. Hatch Unit 2 Date: 6/3/99 Completed By: Macon Beard Telephone: (912) 367-7781 x2878 Operating. Status

1. Reporting Period: MAY 1999

2. Design Electrical Rating (Net MWe): 859

3. Maximum Dependable Capacity (Net MWe): 855 Ibis Month Year To Dale Cumulative

4. Number of Hours Reactor Was Critical: 640.5 3,411.7 137,558.6

5. Hours Generator On Line: 548.6 3,280.6 133,379.5

6. Unit Reserve Shutdown Hours: 0.0 0.0 0.0

7. Net Electrical Energy Generated: 439,268 2,822,494 95,458,666 CHALLENGES TO MAIN STEAM SAFETY / RELIEF VALVES -

Date Tag No. Event Description 990505 2B21-F013A The unit experienced an automatic reactor scram due to turbine control valve 2B21-F013B fast closure when the generator tripped on a phase to ground fault. The fault {

2821-F0130 occurred when a tuming vane, located in the discharge of an isophase bus 2B21-F013D duct cooling fan, broke loose shorting a generator phase to ground. Nine of 2B21-F013F eleven safety relief valves lifted to relieve reactor pressure. Pressure did not ,

2B21-F013G reach the actuation setpoint for the two remaining valves. Failure of the 2B21-F013K turning vanes was attributed to a manufacturer error. It was determined that 2B21-F013L the vanes were not of the proper thickness for the application resulting in 2B21-F013M failure of some of their connecting points. Pieces of the broken vanes were retrieved and the remaining vanes removed from the isophase bus duct cooling system.

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UNIT SHUTDOWNS Docket No.: 50-366 Unit Name: E. l. Hatch Unit 2 Date: 6/3/99 Completed By: Macon Beard Telephone: (912) 367 7781 x2878 Reporting Period: MAY 1999 Type Method of F: Forced l Duration Shutting Cause/Conective Actions No. Date s: so dui.d (Hours) Reason (1) Down (2) Cornments99-002 990505 F 130.7 A 3 An Automatic reactor scram occurred due to turbine control valve f ast closure when the generator tripped on a phase to ground fault. The fault occurred when a turning vane, located in the discharge of the isophase bus duct cooling fan, broke loose shorting a generator phase to ground. Failure of the turning (continued below)99-003 990522 F 64.7 A 5 The Main Generator was removed from the grid to repair a hydrogen leak at the neutral bushing.

The leak was repaired and the unit retumed to service. Reactor power was mnintained at 10%

of rated while the generator was off-line.

(1) Reason: (2) METHOD A-Equipment Failure (Explain) 1-Manual B-Maintenance or Test 2-Manual Trip / Scram C-Refueling 3-Automatic Trip / Scram D-Regulatory Restriction 4-Continuation E-Operator Training / License Examination 5-Other (Explain)

F-Administrative G-Operational Error (Explain)

H-Other (Explain)

CAUSE/ CORRECTIVE ACTION / COMMENTS:

99-002 (continued) vanes was attributed to manufacturer error. It was determined the vanes were not of the proper thickness for the application. Pieces of the broken vanes were retrieved and the remaining vanes removed from the isophase bus duct cooling system.

NARRATIVE REPORT Unit 2 began the month of May operating at approximately 2708 MWth. The unit experienced an automatic reactor scram on May 5 when the generator tripped on a phase to ground fault (see description of event 99-002 for details). The unit was retumed to power operation on May 10 and attained maximum operating power of 2708 MWth on May 12. Shift began reducing load on May 21 to remove the generator from the grid and repair a hydrogen leak on the neutral bushing. The unit was retumed to the grid on May 25 and operation at 2708 MWth on May 26. Shift continued to maintain approximately 2708 MWth for the rest of the month.

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