Coastal Region Tornado Damage
March 15, 2008
Plant McIntosh Steam Damage
Notes verbatim from steam plant log book
• Bad lighting strike on unit. Mw’s dropped to 5 MW and picked back up to 163 MW
• Ga. Control called at 9:58, requesting more voltage on machine and all CT’s
• Called 8-506-2874 about down line across plant access road 9:20 CST
• Lost generator breaker 75756 (South) during storm. Try to put it back in Per Joe Griggs.
• CC Site was badly damaged by a tornado? All workers Zittrouer, Duke, Atkins are all OK!
• W.O. #677 written for south generator breaker 75756 lost it during storm
• W.O. #678 Written for CT-1 cooling water fan
• W.O. #679 Written for leaking roof over turbine room floor
• W.O. # 681 written for cooling fans on CT-8
• Hold Tag put generator breaker 75756 (Per PCC)
Summary of storm damage at Steam and Combustion Turbine Site:
McIntosh steam and combustion turbine site had very little damage. The electrical feed to the administration
building as well as the combustion turbine site is currently not in service. An electrician is being called to
repair. The demineralizers for the combustion turbine site is currently not available. A water trailer is
being called to support demineralizer water needs. Otherwise, the units are all available for full load.
Plant Kraft Timeline
Kraft Event Timeline (some times are approx)
3/15 p.m. eastern
3/15 p.m. eastern
3/15 p.m. eastern
3/15 p.m. eastern
3/15 p.m. eastern
3/15 p.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
3/16 a.m. eastern
9:55
10:30
11:00
11:40
11:53
11:54
12:55
1:13
1:40
3:02
3:15
3:35
3:45
4:33
4:55
7:28
8:42
9:11
9:17
9:36
10:00
10:20
11:15
Units tripped on voltage swings and underfrequency
Unit 1 and Unit 3 LP hood relief diaphrams blew
115v feed restored to plant switchyard - from the Goshen line
Unit 3 station service restored
Unit 1 station service restored
Unit 2 Station service restored
Talked to William Mock
Talked to Doug Arnette
Fire in Unit 2
4102 auto transformer back
Talked to Craig Barrs
Fleet called for Unit 4
Fleet called for Kraft CT and Blvd 1-3
Blvd 1 online
Blvd 2 online
Blve 3 online
Got Unit 2 through critical speed, raising RPM's
Lost Blvd 2 - high vib #2 bearing, also high oil temp
Unit 2 online
Fire in Unit 4
Repairs to Unit 3 Diaphrams complete - releasing clearance
Blvd 2 back online - holding at 8mw watching oil temp and vibration
Fire in Unit 3
Plant McIntosh CC Tornado Damage
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Unit 11 Cooling tower totally destroyed
Unit 10 Cooling tower severely damaged
Fuel Oil MCC destroyed
Maintenance shop destroyed
Conexes filled with specialty tools and equipment destroyed
Equipment Storage Shed severely damaged
Water labs for both units damaged
Gas yard has suffered damage
Admin building has suffered damage
Several company and private vehicles damaged
Miscellaneous heavy equipment damaged
Other miscellaneous damage
Plant McIntosh CC Timeline
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At 20:46:55 Fuel Oil MCC became unresponsive
At 20:47:04 Unit 10 Cooling Tower indicated high vibration on several fans
At 20:47:10 Unit 11 Cooling Tower indicated high vibration on several fans
At 20:50:33 both Unit 11 Aux Circ Water Pumps tripped due to low basin level
which in turn tripped the steam turbine automatically
GPO investigated low basin level and found Cooling Tower destroyed
20:54:41 breakers opened on Unit 11 CT’s and fired shutdown initiated
Unit 10 began normal shutdown after damage was found
21:06:12 Unit 10 shutdown
Management notified
Gas yard leakage noted due to a damaged safety, manually isolated
Unit 11 Tower looking past CW pumps
Unit 11 Tower looking from Unit 10
Unit 11 Cooling tower from back road
Parts of Unit 11 Cooling Tower offsite.
Unit 10 Tower fans and shroud damage.
Unit 10 Cooling tower from U11
Fuel Oil MCC (pad left)
Fuel Oil MCC now in FO Tank basin.
Aerial View of Maintenance Shop
Rear View of Maintenance Shop
Fence line North of Unit 10
Tower across same fence line
These five Conexes were in a row
Natural Gas Yard damage
Unit 10 Tower, Maintenance shop and Equipment storage building.
Limb debris scattered though out plant.
Offsite debris also noted in several locations.
ERT Response trailer, part of U11 Tower debris.
Damage Assessments in Progress
• SCS Engineering and Marley Rep in route to assess options
regarding cooling towers.
• GE will provide assessment of any damage to gas turbines.
• HRSG damage to be assessed by HRST
• Alstom Steam Turbines to be assessed by Alstom
• Water Treatment Plant to be assessed by GE
• Gas yard will be assessed by AGL
• Electrical and structural support by SCS Engineering
• GPC Storm center is providing initial support.
• Southern Company insurance reps to be onsite tomorrow morning.