ML20086A300

Reactor Bldg Crane & Cask Yoke Assembly Mods

ML20086A300
Person / Time
Site:	Dresden, Quad Cities
Issue date:	10/31/1994
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20086A284	List: ML20086A283 ML20086A300
References
NUDOCS 9507030154
Download: ML20086A300 (7)

Text

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Dresden Special Report No. 41 Ouad Cities Special Report No. 16 REACTOR BUILDINE CRANE AND ,

CASK YOKE ASSEMBLY MODIFICATIONS AEC Dockets '

50-237 50-249 50-254 -

50-265 .

Cosmonwealth Edison Company October, 1974 4

9507030154 950627 PDR ADOCK 05000254 P PDR

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TABLE OF CONTENy Section Page l.0 INTRODUCTION 1 t 2.0 REACTOR BUILDING CRANE 2 2.1 Description of Modifications 2 2.2 Dual-Load Path Hoist System 6 2.3 Control system 13 3.0 TEST PROGRAM 23 3.1 Component Adequacy 23 3.2 Component Failure Analysis 24 l' 3.3 Quality. Assurance 25 ,

4.0 SAFETY FEATURES . 31 4.1 Description of Load Carrying Path 31 4.2 Lead Line safety Factors 34 5.0 CASK 36 5.1 cask Description -

36 5.2 Cask Lifting Yoke 36 5.3 Cask Handling Safety Criteria 30 6.'0 CONSTRUCTION SCHEDULE i 40 APPENDIX 41 l

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1.0 INTRODUCTION

To preclude the possibility of dropping a spent fuel cask during handling cperations over the spent fuel pool, modifications will be made to the existing Reactor Building Crane and Cask Yoke Assembly.

Crane modifications shall consist of a new trolley utilizing a dual-load path hoisting system for the main hoist.

This system will be available to prevent all postulated credible singin-component failures over the entire supporting load path; from th'e cask supporting system through the redundant cask lift-ing yoke, the redundant hook, the dual-load path hoisting system to the crane bridge structure.

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2.0 REACTOR BUILDING CRANE 2.1 Description of Modifications The existing reactor building crane is a single trolley, overhead electrical traveling-type, with both a main hoist ,

and auxiliary hoist. The existing trolley will be replaced by a new trolley containing a dual-load path hoist system for the main hoist and a standard arrangement for the i auxiliary hoist. Design requir'ements are as follows:

t A. The entire crane trolley and existing bridge girders will be reviewed for the revised trolley weights in .!

conjunction with the lifted load requirements to establish compliance with CMAA #70 permissible stress ranges. Calculations to be performed by Whiting Cor-poration will also determine the maximum vertical loadings with impact for the bridge girders, as de- ,

fined in section 70-3 of CMAA #70. Design values for operation conditions plus seismic will be based on .

AICS code requirements for OBE and 90% of the minimum yield strength of the material used for DBE. The exact '

values will be provided by. Whiting Corporation with the Component Failure Analysis for this submittal at a later '

date.

i B. The main hoist capacity will be 125 tons and the auxili-ary hoist capacity will be 5 tons. Crane stapless vari-able speeds (maximum) have been established as follows:

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Br'idge -- 50'fpm at full load $

Trolley

-- 33 fpm at full load Main Holst -

5.75 fpm at full load  !

i 17.25 fpm at no lead Auxiliary Hoist -- 30 fpm at full load 90.fpm at no load ,

The new trolley with its dual load path hoist system l weighs 116,000 lbs. which is a 25,000 lbs. increase over the weight of the existing trolley. All calcu-lations and analysis will take this weight increase '

into account. The existing bridge crane and associ- '

ated crane runway support structures will' be evalu-I ated to determine if any revisions will be required i

for handling the new trolley with its increased' weight. i All analyses performed relative to the cask handling procedures will base load values on the details of the ,

National Lead ~10/24 Cask. Should larger casks be placed into service, compatibility wi,th ,the stipulated '

safety requirements will be established.

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All crane parts shall equal or exceed design criteria as established by CMAA Specification 970, and shall be compatible with the requirements of the occupational safety and Health Act of 1970 and'as amendsJ In 1971, as well as ANSI B 30.2.0. t

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1. Motors - General Electric, ' open ball bearing, drip proof,

, solid frame, shunt wound, crane type motors, with Class a non-hydroscopic insulation, rated 30 minutes. Motors will comply.with NEMA standa rds. Auxiliary hoist motor to be gearhead type.

2. C'ontrollers -- Existing Maxspeed 320 system for .

hoists, with existing, transfer switch for auxili-ary hoist control from main hoist. Existing Max-s speed 100 for trolley and bridge controls.

3. Switchboard -- The existing units have been reused. 1

4. Magnetic Brakes -- Two (2) 'Ceneral Electric 'IC-9528

-f A-103 16 inch DC magnet operated electric shoe type 1 brakes for main hoist. Two (2) Ic-9528 A-102 13 inch DC magnet operated electric shoe type brakes '

for auxiliary hoist. ' .

5. Trolley Type - - Four (4) motor type with welded i

eteel framer center to center of trolley raile shall be 17'-0". .

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6. Trolley Drive - Enclosed speed reducer type plus an enclosed Abart speed reducer located between motor and trolley drive.

7. Wheels -- 27 inch diameter fabricated fras rolled steel rim toughened material.

8. Drum - 58 inch diameter fabricated from steel j

materials for main hoist. 21 inch diameter fabri-cated from stainless steel for auxiliary hoist.

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9. Holst Ropes -- Main hoist shall consist of;12 i i

I parts 1-1/4 inch diameter Monitor AAA type I.W.R.C.  !

-Auxiliary hoist shall consist of 1 part 7/8 inch I' diameter A 304 stainless steel with I.W.R.C. Main  !

hoist ropes attached to a specially damped equal-  !

.iser assembly with unbalanced condition limit switch cut-offs.  :

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10. Limit Switch -- Weight, type control circuit switch '

plus screw type for upper and lower hoist limits i i

and centrifugal overspeed switch for lowering. t

11. Load Block -- Dual load path type with bronze bushed sheaves for main load block and with forged i i

steel main hook. stainless-steel yoke and hook for i

auxiliary hoist.

12. Trolley Brakes -- one (1) IC-9516Ll60 and one (1)

IC-9516-161 DC solenoid operated electric shoe typs ,

brakes.

13. Collectors -- Double set of Insul - 8 shoe type.

14. Stops -- rour (4) spring type trolley bumpers.

15. Main Holst Inching Drive and Controls -- AC squirrel cage continuous duty 5HP motor with independent con-trols.

16. Load Sensing readout with high and low limit cut-offs.

D.

Electrical power as presently provided for the existing Reactor Building Crane will be adequate for all opera-tional requirements of the cask handling system.

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