ML16341A844

7 to Updated Final Safety Analysis Report, Chapter 5, Table 5.1-1 - Potential Missiles Considered in Class I (Seismic) Structure Design. Page 1 of 2

ML16341A844
Person / Time
Site:	Cook
Issue date:	10/24/2016
From:	Indiana Michigan Power Co
To:	Office of Nuclear Reactor Regulation
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References
AEP-NRC-2016-42
Download: ML16341A844 (2)

Text

INDIANA AND MICHIGAN POWER D. C. COOK NUCLEAR PLANT UPDATED FINAL SAFETY ANALYSIS REPORT Revision: 24.0 Table:

5.1-1 Page:

1 of 2 POTENTIAL MISSILES CONSIDERED IN CLASS I (SEISMIC) STRUCTURE DESIGN ITEM DESCRIPTION WEIGHT VELOCITY IMPACT AREA ORIGIN Bolted Wood Decking 12' x 12' x 4" 450 lbs 200 mph 4 ft2 Tornado Borne Corrugated Siding 4' x 4' 100 lbs 225 mph 0.25 ft2 Tornado Borne Passenger Car 4000 lbs 50 mph traveling on the ground 10 ft2 Tornado Borne Schedule 40 Pipe 1 2 1/2" Dia x 8' 46 lbs 195 ft/sec 6.5 in2 Tornado Borne Reactor Control Rod Drive Mechanism 1623 lbs 25 fps for 3 ft travel to missile shield 11.3 in2 Reactor Coolant Pressure Driven after R. C.

Housing Mech. Failure UNIT 1 TURBINE 2 3 Vane of Last Stage Bucket 54 lbs 1170 ft/sec 0.82 ft2 Mech. Failure During Turbine Overspeed Last Stage Wheel Segment 120° Segment 8264 lbs 409 ft/sec 8.43 ft2 Mech. Failure During Turbine Overspeed 1 Considered as a missile only for design of the Auxiliary Building east of Spent Fuel Storage Pool.

2 Impact area for turbine items is the average of the minimum and maximum cross-section areas.

3 The missile information in this table is for the removed General Electric low pressure turbines as this analysis bounds other Unit 1 rotating elements. The current missile analysis for the low pressure turbines is based on the missile probability analysis discussed in Section 1.4.7.

INDIANA AND MICHIGAN POWER D. C. COOK NUCLEAR PLANT UPDATED FINAL SAFETY ANALYSIS REPORT Revision: 24.0 Table:

5.1-1 Page:

2 of 2 POTENTIAL MISSILES CONSIDERED IN CLASS I (SEISMIC) STRUCTURE DESIGN ITEM DESCRIPTION WEIGHT VELOCITY IMPACT AREA ORIGIN UNIT 2 TURBINE (2)

Vane of Last Stage Bucket 168 lbs 1135 ft/sec 1.87 ft2 Mech. Failure During Turbine Overspeed Disc 1 Segment 120° Segment 13,350 lbs 634 ft/sec 15.08 ft2 Mech. Failure During Turbine Overspeed Disc 2 Segment 120° Segment 12,100 lbs 574 ft/sec 13.92 ft2 Mech. Failure During Turbine Overspeed Disc 3 Segment 120° Segment 8,360 lbs 551 ft/sec 13.2 ft2 Mech. Failure During Turbine Overspeed Disc 4 Segment 120° Segment 16,600 lbs 595 ft/sec 15.7 ft2 Mech. Failure During Turbine Overspeed Note:

1. Miscellaneous missiles such as valve stems, bonnets, instruments wells, thimbles, and pipe rupture whip were considered in the design of the structures where applicable; however, tornado generated and turbine missiles, or radiation and structural considerations, generally, were the determining factors in the design of Class I structures.

2. The population of missiles used in the TORMIS analysis was based on a physical walk down of non-safety-related buildings, trailers, fencing, trees and parking lots within a 2000 feet radius of the plant. Also included were missiles from plant buildings with siding not designed for tornado winds. This walk down resulted in a potential missile population in excess of 55,000 objects.