ML19221A922
| ML19221A922 | |
| Person / Time | |
|---|---|
| Issue date: | 02/28/1976 |
| From: | NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | |
| References | |
| REGGD-O1.104, NUDOCS 7907100383 | |
| Download: ML19221A922 (10) | |
Text
n U.S. NUCLEAR REGULATORY COMMISSION February 1976 REGL LKTORY GUBDE OFFICE OF GTANDARDS DEVELOPMENT REGULATORY GUIDE L104 OVERHEAD CRANE HANDLING SYSTEMS FOR NUCLEAR POWER PLANTS A. INTRODUCTION General Design Criterion I, "Quahty Standards and certain specified systems or components he in accor-Records," of Appendix A, " General Design Criteria for dance with generally recognized codes and standards.
Nuclear Power Plants," to 10 CFR Part 50, "Licensmg This guide describes methods acceptable to the NRC of Production and Unlitation Facilities," sequires that staff for complying with the Commissips's regulations structures, systems, and components tmportant to safety with regard to the desipi, fabricati%nd testing of be designed, fabricated, erected, and tested to quality overhead crane systems used fojrdoct% fueling and standards commensurate with the importence of the spent fuel handling operations. TNa uide Y lies to all safety function to be performed. General Design Cri-nuclear power plants for w licants elect to terion 2, " Design Basef, for Protection Against Natural provide a single-failureppc),
crane handling Phenonwna," requires that structures, systems, and com-system.
g ponents important to safety be designed to withstand the effects of natura! phenomena such as earthquakes ON General Design Critenon 5, " Sharing of Structures, I
sf critical loads can be accom-Systems, and Components." prohibits the sharing of The
.q ety features to the handling equip-structures, systems, and coraponents important to safety plishe by '
among nuclear power units unless it can be shown that men -
ad2 s cial features to the structures and reas e hi the criticalload is carned, or a combin-such shanng will not significantly impair their ability to wo, thus enabling these areas to withstand perform their safety functions. In addition, General
. of a load drop in case the handling equipment Design Cnterion 61, "Iuel Storage and Handhng and
' t R. dioactivity Control," requires, in part, that eq f This guide covers criticalload handling equipment lose plants whcre reliance for safe handling of cri-storage and handling systems be designed to er re r
adequate safety under normal accident conditig s
"I loads will be placed on the overhead crane system
=
' y makingit single failure proof.
Ilegu!atory Guide 1.13, "Spe nt Ft St se Facility Design hasis," describes method ep ie Overhead crane handling systems are often used for to the NRC staff for complyir g with the Corr m
'on's handling critical items at nuclear power plants. The regulations witis regard to the construction of spent handling of critical loads such as a spent fuel cask raises fuel storage fauhties and2N)handhng systems.
the possibility of damage to the safety related systems, 9 pg structures, and equipment under and adjacent to the path en which it is transported should the handling w
w Appendix D, g,g, Qance Criteria for Nu-system sufTer a breakdown or malfunction during this clear Power PlantsOnd FJ o seprocessing Plants," to 10 hand'ing period. Definitions of critical items or cntical CFR Part 50pquQ in rt, that measures % estab-loads should be submitted in the PSAR.
liched to eg*keptr4,r esign, materials, fabrication, special procoq insulhtion, testing. and opera'. ion of Design Criteria structure s, sy#
s, and componmts important to safety. includin g sne handling systems. Section 50.55a, To provide s consistent basis for selectme equip
" Codes and Straards," of 19 CFR Part 50 requires that ment and comp 3nents for the handling of cntical loads design, fabricaaon, installation, testing, or inspection of a hsi cf mdes, standards ed recamineded practices USNRC RE gut ATORY GUIDES C o-.m..aos e ti.
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4 generally available to industry is appended to this guide.
ensure the absence of limeDar teanng in the base metaJ The applicable requirements of these standards and re-and the soundness of the weld meta!. Other problems commendations should be used to the maximum ex' nt with weldmg of low. alloy steels can occur if the base practical to obtain quality construction. Where dif-metal temperature is not properly controlled during ferences or conflicts in interpretation exist betwen the weldmg and the postweld heat treatment. Regulatory codes standards, or recommendations, use of the mos-Guide 1.50, " Control of Preheat Temperature for Weld-strinFent requirement is recommended. Ilowever, special ing of l_ow. Alloy Steel,' identifiet this potential prob-features should be added to prevent and control or stop tem and indicates an acs.eptable proced ne for obtaining inadvertent ope:ation ad malfunction of the load-sound welds in low alloy steelt support ng and -moving components of the handling system.
Cranes are generally fabncated from st ructural shapes and plate roued from mild steel or low-alloy steel.
When an everhead crane hindling system wiu be Some cf thue steel parts exceed % inch in thickner* and used dunng the plant construction phase prior to its may have br:ttle fracture tendencies dunng some of the intended service in the operating plant, separate perfor.
intended operatmg temperatures, so that testmg of the mance specifications are needed to reflect the duty material toughness becomes necessary. Specificauy, the cycles and loading requirements for each service. At the nil.ductihty trans; tion temperature (NDTf) should be end of the construction penod, changes to the crane determined.
system may be required to redlect the specifications for the permanent operating plant condition. For exaraple, Safety Features if the spedfications for the size of the hoist drive motor differ sufTiciently for the two applications, the raotor General. Numerous applications have been reviewed and the affected control equipment would have to be by the staff, and the need for inclusion of certam saferv replaced or char ged for the cperating plant phase. Fea-features and the magnitudes of specific operational tures and functions needed for the cranes during the limits to provide adequate safety have been determined plant construction period are not considered in this guide except where t'te use of the crane may iniluence It is important to prevent the relea.e of radio-its design and operation for the permanent plant opera-activity in case of failure, inadvertent ope ation, mab tion.
function, or loss of load, and it may be nscessary to include special features and provisions to preclude Overhead crrnes may be operating at the thne when system incidents tnat would result in release of radio-an earthquake occurs. Therefore. '" cranes should be activity.
designed to retain centrol of and hold the load, and the bridge and trolley should be desi;;ned to remain in place A crane that has been immobuired beuuse of mal-on their respectne runways with their wheels prevented function or future of controls or components while from leaving the tracks duting a setsmic event. If a holding a critical load shotdd be able to set the load seismic event comparable to a safe shutdown earthquake down while recairs or adjustments are mare. This can be (SSE) occurs, the bridge should remain immobile on the accomplished by inclusion of features that will permit runway, and the trolley with load should remain im-manual operation of the hoisting system and the bndge mobile on the crane girders.
and trolley transJer mechanisms by means of ancillary, auxiliary, or emergency devices.
Since all the crane loading cycles will produce cyclic stress, it may be necessary ta investigate the potential A crane handling system includes all the structural.
for failure of the metal due to fatigue. When a crane wiu mechanical, and electrical components that are needed be used for the construction period, it will experience to lift and transfer a load from one location to another.
additional cyclic loading, and these loads should be Primary or principal load beanng components, equip-added to the expected cyclic loading for the permanent ment, and subsystems such as the dnving equipment, plant operation for the fatigue evaluation.
drum, rope reeving system, control systems. and brakmg means should receive special attention.
Materials and Fabrication All auxiliary hoisting systems of the main crane Bridge and trouey structures are cenerally fabricated handling system that are employed to hft or assist m 1 wc! ding structnni shapes together. Problems have handling critical loads should be provided with the same 9
been expenenced with weld jotnts bciween rolled strue safety features as the rest of the main crane handhng tural membett Specificauy, subsurface lameUn tranng system.
has occurred at the weld joints during fabrication ad the load-beanng capacity of the joint has thus been re-floisting niachinery. Proper support of the rope duced Raihography or ultrasonic inspection. as appro-drum is necessary to ensure that they would be retamed pnate, of au load-bearing weld joints would help to and prc,cated from fathng or disengaging from then 126 148
braking and control system in case of a shift or bearug Selection of hoisting speed is infh'enced by such failure. Two mechanical holding brakes ia the hoisting it ms as reaction tin e for corrective action for the hoist-I rystem (raising and lowering) that are automatically ac-mg movement and the potertial behavior of a tailed tivated when electnc power :s off or when mechanicauy rope. To Present or lunit damaging effects that may re-tripped by overspeed devices or overload devices in the sult from dangerous tope spinoff in case of a rope break, hoistmg system wul help ensure that a critical load will the hasting speed should be limited. A 5 fpm hoisting be safely held or controUed in case of failure in the speed hmit is an acceptable limit. The rope traveling mdividual load beanng parts of the hoisting machmery, speed at the drum is higher than at other poin's in the reevmg system, and the potential for damage due to rope Each holding brake should have more than fuu-load flailin;; and interference with other parts of the system stopping capacit, but should not have excessive capacity should be considered. Conservative industry practice that could cause damsge through sudden stopping of the limits the rope hne speed to 50 fpm at the drum as a hoisting machmery. A brake capacity of 125% to 150%
conservatrve approach.
of the breakdown torque developed by the motor at the point of brake application has been determined to be Power trantmission gear trains are often supported accept able, by fabricated weldme.its of structural parts. The proper abgnment of shifts and gears depends on the adequacy Manual operation of the heisting brakes may be of bearings and their st.ppcrts to maintain correct abgn-necessary durir.: an err.ergency condition, and provision ment of all components. The proper functioning of the for this should be included in the design conditions.
hoisting machinery during load handlinh can best be en-Adequate heat diss'pation from the brake should be en-sured by providing adequate support strengtn and proper sured so that damage does not occur if the lowering alignment of the individual comnonent parts and the v-locity is permf tted to increase excessively. Features welds or bolting that Smds them together.
rhould be included in the manual control of the brake to limit the lowring sp-ed. A limiting velocity of 3.5 fpm Bridge and Trouey. Failure of the bridge and trouey has been determmed to be acceptable for trouble-free travel to stcp when power is shut off could result in operation.
uncontrolled incidents. His would be prevented if both bridge and trolicy drives are provided with control and Component parts of the vertica! hohting mechanism holding braking systems which will be automatically are important. Specifica))y, the rope and reeving system applied when the power is shut off or if an 'verspeed or deserves special unsideration during design of the sys-overlord condition occurs because of malft 'ction or
'em. The election of the hoisting rope which is a "run-failure in the drive system. Sufficient braking ca#;
ning see" should include consideration of size, con-would be needed to overcrme torque developed by the struction, lay, and r. eans of tubrication to provide for drWe motor and the power necessary to decelerate the the efficient working of the strands and in'ividual wires.
bridg2 or trolley with the attached laad to a complete The load-carrying rope will suffer accelerated wear if it stop. A holding or control capacity of 100 percent et rubs excessively on the sides of the grooves in the drum the maximum torque developed at the point of brake and sheaves due to improper alignment or large fleet application would be an acceptable capacity for each angles between the grooves. The load-carrying rope will braking system. Drag-type brakes are subject to excessive furthermore suffer shock losing if it is partly held by wear, and the need for frequen; service and repair tends friction on the groove wall and then suddenly releascd to to make this type of brake less reliable; they therefore enter the bottom of the groove. The rope can be should not be used to control movements of the bridge protected by the Cection of conservative fleet angles.
and trolley.
Ropen may also snff r damage di e to excessive strsin dev-loped if the cable construction and the piten The travel speed of the trolley and bridge will in-diameter of the sheaves are not properly selected.
fluence the operation of the crane as well as the equip-Fatigue stress in ropes can b-minimized when the pitch ment design and selection. Numerous crane applications dameter af the shea,es are selected large enough to have been studied and it has been concluded that the produce only nominal stress levels. The pitch diameter travel speed for nuclear power plant application should of the sheaves should be larger for ropes rnoving at the be conservat vely selected. Trolley and bridge speed highest velocity near the drum and can be smaller for limits of 30 fpm and 40 fpm, respectively, have been sheav-s used as equalizers where the rope is stationary.
determmed to be acceptable.
Equaber, for stretch and load on the rope reevmg Drivers and Controls. Of the basic types of electric astem may be of either beam or sheave type. A dual drive motors available for crane operation, the series-rope reeving system with individual attaching points and wound a.c. or d.c. motors or shunt-wound d.c. mators means f or balancing or "stributing the load betwen the are readily adaptable to various control systems, and two operating rope i.smg systems will permit either either of these types wauld be acceptable Compound-rope system to hold the critical load and maintain bal-wound motors should not be used because of difficulty ance in case of tailure of the other rope syste m.
in control of *he breakdown torque. The horsepower 26 149 1.104d
a ratmg of the driving motor should be matched with the C. REGULATORY POSITION caJculated requirement that considers the design load and acceleration to the design hoisting speed. Over-When an appli; arc chcoses to provide ssfe handhng powenng of the hoisting equipment wouldimpose addi-of cntical loads by making the overheao crane handhng ticnal strain on 'he machine y and load-carrying devices system smgle-fadure proot rather than by addmg special by increasig the hoisting acceleration rate. A motor rat-features to the structures and areas over which the criti-ing lir.uted.o 1IM vr' the design rating would provide cal ioad is carried, the system should be designed so that adequate power without Mss of flexibility and would be a single failure mil nut result in loss of the capability of accepul.
the handling system to perform its safety functions.
Norma!!), a crane sys:em is equipped witi mechani-Gverhead ciane he.ndling sys;e:ns used for handhng i
cal and electrical limiting devices ta shut off Nwer to entical loads (followmg construction) such as loads dur-driving moters when the crant hook, trolley, and brid;c ing reactor refuebng and spent fuel handirig should be epproach the end of travel or when other parts of 'he designed, fabricated, installed, inspected, tested, and crane eystem would be damaged if power was not sr,ut operated in accordance with 'he follomng:
off. It is prudent to include afety devices in the control system for the crane, in addition to the limiting devices.
1.
Perfotmance Specificadon a id Design Cntena for the purpose of ensunng tuat the controls will retum to or rnaintam a safe hold 2ng pos. tion in case or malfunc-a.
Feparate performan:e sp cificath rs that tion, inadvertent operation or failute, or overspeed and ara required to deveiop design criteria should be pre-overtorque conditions. Overpour and ovs. speed con-pared for a permanent crane that is to be used for con-ditions should be considered aui operating hauru as they struchon prior to use fcr plant operatwn.The allowable may increase the haurd of malfunction or inadvertent design stress hmits shoidd be identical for both cases.
operation. It is essential that the controls be capable of and the sum total of simultaneously aophed h> ads should stopping the hoisung rrevement within amounts of not result in stress levels causing permanefit detormation movement that damage would not occur. A 3-inch maxi-other than localized strain concentration m any part of mum hoisting movement would be an acceptable stop-the handling systent pmg distance.
b.
The operating environment, includmg max.
Operational Tests imum and mimmum pressure, temperature, humidity, and emergency cotrosive or hazardous conditions.
Operatienal tests of crane systems should be per-should be specified for the crane and hfting fixtures.
formed tc verify the proper functioning oflimit switches and safety davices and the aoility to perform as de-(1) Closed box sections of the crane struc-signed. Ilowever, special arrangements rity have to be ture should be vented to avoid collapse dunng contatn-made to test overload and overspeed sensing devices.
ment pressurization. Liainage sho-dd be proaded to avoid standing water in the crare sttucture.
Exhting flandling Systerr.:
(2) Mmimum operatm g temperatures it mw be necessary to determine the extent to should be specified in order to reduce the possibihty of which an existing handling system and the treas in w+1ich bnttle fracture of the ferritic ioad-carrying members of
'ie load is trtnsported may require that the crane the crane. Materials for structural member essential to handling sy: tem be sinde failure proof Therefor *, a structural integrity should be impact tested unless ex-detailed inspect 2on may be necessary to deteimine the empted by die provisions of paragraph AM-218 of the condition of each crane pnor to its ccntimLd use and to ASME Code, Section Vlli, Division 2. Ilowever, the define the portion of the system that may need
" minimum design temperature" as used therem should alteration, addition, or replacement in order to ensure its be defined as 60 F below the nunimum operatmg tem-abihty to perform acceptable handhi.g of criti:al loads.
perature. Either drop weight test per ASTM L-208 or Giarpy tests per ASTM A 370 may be used for impa t Quality Assurance testing. The mmimum drop weight test requirement should be nd ductihty transition temperature (NDT11 Althouch ;rane handhng sy stems for critical loads not less than 60 F below tne minimum operatmg tem-are not required f or the direct operatwn of a nuclear Prature Mmtmum Charpy V-notch impact test require-power plant. the nature of their function riakes it necev ments should be ihow men m leic \\M 211 1 of the saa to ensure that the desired quahty lesel c attained A ASME Code. Sestion Vill. Dmsion 2. which should N quality nsurance Procram should be establided to the met at a temperature 60T helow the nunimum operat extent necessary to inJuJe the recommendatioas ol thu me temperature Alternative methods of tracture anal guide for the design, tabncation. mstallation. testing y sis that a;hieve an equivalent maran of safets naimt and ope ation of crane handhne systems for safe fracture mas be used if they mclude touchness measur; handhng of enticalloads ments on ehh heat of steel used m stm ' d a nm' 126 150
a essential to structural integrity. In addition, the fracture b.
Auxiliary wstems. dual components. or an analysis that provides the basis for setting minimum cdla y 9 stems shouy he prouded so that mma operating tempetatures should include consideration of subsystem or component f at!ure, the load will ir stress levels; quali*y control; the mechanical checking.
retamed and held in a stable or immobile safe positwn testing, and preventive maintenance program; and the Means should be provided for usmg the de c.
temperatures at which the design rated load test is run vices required tn repairing, adjusting, or replacmg the relative to operating temperature.
failed component (s) or subsy stem (s) when fadare of an (3) As an alternative to the recommenda.
active component or subsystem has occurred and the tions of regulatory position C.I.b.2, the crane and lifting load is supported and retained in the safe (temporary I fixtures may be subjected to a cold proof test as des.
position with the hand!mg system immobile. As an alt r-cribed in regulatory position C.4.d.
native to repaanng the crane m place, means may be provided for safely moving the immobilized handimg (4) Cranes and lifting fixtuc-s made of system with load to a safe laydown area tha: has been low-alloy steel such as ASTM A514 should be sabjected designed to accept the load while the repurs are being made.
to the cold proof test described in regulatory position C.4.d.
d.
The design of the crane and its ope atmr c.
The crana should be classified as Seismic area should include provisions that will not ic~ur the Category I and shotdd be capable of retaining the max-safe operation of the reactor or release radmactnity imt'm design load during a safe shutdown earthquake when corrective repairs, replacements, and a ljustments (SW), uhough the crane may not be operab?e after the ate being made to place the crane Isrdhng system Lck seismic event. Tne oridge and trolley shotJd be prcvided inte service after comjorent fai'me(s).
with means for preventing them from leaving their run-ways with or witnout the design load during operation 3.
Equipment Selection or under any seismic excursions. The design rated load plus ope'ational and seismically induced pendulom and Dual load attaching points (redundant de-a.
swinging load effects on the crane shou 2d be considered sign) shc uld be provided as part of the load block essem "i the design on the trciley, and they should be added to bly which is designed so that each attachmg point mil h-9 the trolley weight for the design of the bridge.
able to support a static load of 3W (W is weight of the design rated load) without permanent deformatmn of d.
All weld joints for load-bearing structures any part of the load block assembly other than locali/ed including those susceptible to lamellar ieanng should be stratn concentration in areas for which additional mate mspected, including nondestructive examination for nal has been provided for weu.
soundness of the base metal and weld metal.
b.
Lifting devices that are attached to the A fatigue analysis should be considaed for load block such as lifting beams, yokes, ladle or trunmon e.
the critical load-bearing structures and components of type hooks, slings, toggles, and clevises should he of re-the craae handdng systerrt The cumulative fatigue usage du-dant design wit *1 dual or auxilisry device or combina factors should reflect effects of the cyclic loading from tions thereef. Each device should be designed to support both the construction and operattng peric,ds.
a stat,c load of 3W without permanent deformation.
The vertical hoisting (raising and lowennN f.
Preheat and postheat treat;nent (stress re-c.
lief) temneratures for all weldments shc,uld be specified mechanism which uses rope and consists of uppe-in the weld procedure. For low alloy steel, the recom.
sheaves (head block), lower sheaves (load block),
mendations of Regulatory Guide 1.50, Control of Pre.
rope reeving system, should provide for redundantly heat Temperature for Welding of Low Alicy Steels."
signed dual hoisting means. Maximum hoisting speed should be no greater than 5 fpnt should be applied.
2.
Safety Features d.
The head and load blocks should be &
signed to maintain a verticalload balance about the ten a.
Ihe autonmic controb and limiting de-ter of lift from load block through head block and hase vices should be des gned so that when disoroers due to a reeving system of dual design. The load hhxi sho.d.f inadvertent operation, component culfunction, or dis-mamtain abgnment and a position of stabihty mth arrangement of subsystem control functions occur smgly either system being able to support 3W within the break or in combinaima during the load handitng and fadure ing strength of the rope and maintam load stahthty amt has not occurred m either subsystems or components, vertical abgnment trom senter of head blod through au these disorders will not prevent the handling system hoisting components through the center of grantv of th-from being maintained at a safe neutral holding asnion.
load.
126 1r*J I l(14A
e.
Design of the rope reeving system (s) should geometnc configurr. tion of the attaching romts should be dual with each system providing separately the load be made before and after the test and should be tub bahnte on the head and load blocks through cenfigura-lowed by a nondestructive mmination that should con-tion et ropes and rope equalizer (s). Selection cf the sist af cem'otnations of magnetic particle, ultrasonic.
hoistmg rope or runnhg rope shculd include considera.
radioguph, and Jye penetrant examinations to verify tion of the size, construction, lay, and means or type of
- he soununess of f abacation and ensure the integrity of lubrication to maintain efficient working of the indivi-this p.ma of the hoisting system. The resuhs of exanu-dual wire strands when each section of rope passe' over nation, should be documented and recorded for the the individual sheaves during the hoistmg or'eratfor.. rhe hoistmg system for each overhead crane.
effects of impact loadings, acceleration. A emergency h.
Means should be provided to sense such stops should be included 'n selection M rope eM reeving systems. The wire rope should be o x 37 IWRC (iron items as electnc current. temperature, overspeed over-wire rope core) or comparate classification. The lead loadmg, and overtravel. Contrc!s should he provided to line stress to 'he drum during hoisting (dynamic) at the absorb the kinetic energy of the rotating machinery and maximum design spe(d with the design rated load should s' p the heisting movement within a maximum of 3 not exceed 20% of the manufa:turer's published rated inches of vertical trasel through a combination of clec strengdi. Une speed during hoisting (raising or lowering) trical power controis and mechanical braking systerns Jtould not exceed 50 fpm.
and tornue controls if onc rope or one of the dual reev-ing system should fad or if overloading or an oversoeed c ndition should occur.
f.
The maximum fleet angle from drum to lead sheave in the load block should not exceed 3 %
- i. The control systems should be designed m degrees at any one point during hoisting and should have a combination of electrical and mechanical systems and ordy one 180-degree reverse bend f or each rope leaving may include such items as contactors, relays, resistors.
the drum and reversing on the first or lead sheave on the and thyristors in combination with mechanical devices load block with no other reverse bends other than at the and nEch nical braking systems. The electric controls equaluer if a sheave equalizer is used. The fleet angles should be selected to provide a ma.ximum breakdowTi between individual sheaves for rope should not exceed torcpe limit of 175% of the required rating for a c l-4 degrees. Equalizers may be of the beam or sheave motors or d.c. motors (series or shunt wound) used for type or ccmbinations thereof. For the recommended 6 x the hoisting drive motor (s). Compound wound d.c 37 IWRC classification wire rope, tne pitch diameter of motors should not be used. The control system (s) pro-the lead sheave should be 30 times the rope diameter f '
vided should include consideration of the hoisting the 180-degree reverse bend,26 times the rope diameter (raising and lowenng) of all loaas, mcluding the maw for running sheaves and drum, with 13 times the rope mum desi n rated load, and the ef fects of the inat2a of g
diameter for equalizen. The pitch diameter is rnessured the rotating hoi $ ting machinery such as motor armature.
from the center of the tope on the drum or sheave shafting and couptmR Few reducer, and drum.
groose through the center of the drum or sheave to the center of the rope on the opposite side. The dual reeving j
The mechanical and structural components system may be a single rope from each end of a drum of the complete hoistmg system should have the re-terminating at one of the blocks or equalizer with pro-quired strength to resist fadure if the hoistmg system visions for equalizing beam type load and rope stretch.
should "two block"3 or if " load hangup"2 should occur wth each rope designed for the total load, or a 2-rop 2 dunng hoistmg The designer should provide means system may be used from each drum or separate drums withm the reeving system located on the head or on the u3mg a sheave equalizer or beam equalizer, or any other load block combinations to absorb or control the kinetic combination which provides :wo separatr. and complete energy of rotating machinery prior to the incident of reeving systems.
two blocking or load hangup. The location of mechan-ical holdmg brakes and their controls snouH ptoude g.
The porticas of the vertical hoisting system positive, reliable, and capable means to stop and hold components, which include the head block, rope reeving the hoisting drum (s) for the conditions descrBed in the system, load block, and dual load-attaching device, design specification and regulatory positions I and 2.
should each be designed to sustam a test load of 2003 of This should include the maximum torque of the dnymg the design rated load. Each reeving system and each one of the load-attaching devices should bs as.embled with approximately a 6-inch clearance between head and load blocks and should support 200% of the design rated load I"Two blockmg" n the art of murmed hooting m whu h f a f
without permanent deformation other than localized I ad t 1 (k and head block awemblies arc brought mto pbs shal strain con. centration or localized deer 3dation of the com-block and creatmg @ot k toads to rope and reevmg mtem.
ponents. A 2001 static-type load test should be pet-2..b.ad harcup" h the act in w hic h tP e load t loc k and or ti ut n formed for each reevmg system and a load-attaching stopped danny tontmg by cataneis n>ent w oS f nel e ts point at the manufacturer's plant. Measurements of the theret9 overloadmg the hohtirz mtem.
3 I mtn
P motor if a malfunction occurs and power to the dnving dnv.ng motor and gear reducer for trouey and bndre motor cannot be shut off.
mction of the overhud bridge crane should not exceed 110% of the calculat:d honepower requirement at mau k.
The load hoisting drum on the trouey mum speed with d~ign rated Imd attache 1. Incremental should be provided with structural and mechanical or fractiaru! mch rmvemants. when required should k safety devices to prevent the drum frem dropping.
provided by such items as variable speed or inching disengaging from its holdmg brake system, or rotatmg.if motor drives. Control and holdmg orakes shoulf cach he the drum or any portion of its ahaft or bearngs should rated at 100% of maximum drive torque at the b nt of i
fail or fracture.
application. If two mechanical brakes. one for mntrol and one for holding,.re provided, they should ac ad-1.
To preclude excessive breakdown torque, justed with one brake in each system for both the trouey the honepower rating of the electric motor dnve for and bndge leading the other and should be activated by hoisting sboJd not exceed 1107 of the calculated de-release or shutoff of power. The brakes should also be ugn horsepower required to hoist the desis;n rated load mechanically tripped to the "on" cr "holdmg" position at the maximum design hot
- speed.-
in the event of a malfunction in the power supply or an overspeed condition. Provisions should be made for
- m. The minimum hoisting braking system manual operation of the brakes.The holdmgbrake should should include one pour control braking system (not be desiped so that it cannot be used as a foot operated mechanical or drag brake type) and two mechamcal slowdown brake. Drag brakes should not be used. Oppo-holdmg brakes. The holding brakes should be activated site wheels on bridge or trouey that support bridge or when power is off and should be automatically mechani-trolley cn their runways should be matched and have cauy tripped on overspeed to the fullhol. ling position if identical diameters. Trolley and bridge speed should be malfunction occun in the electrical brake controls. Ea.h limited. A maximum speed of 30 fpm for the trolley and holding brake should be designed to 125%150% of the 40 fpm for the bridge is recommended.
maxirnum developed torque at point of application (lo-cation of th." brake in the mechanical drive). The mini-q.
The complete operating c;ntrol system and mum design requirements for braking systems that w;11 provisions for emergency controls for the overhead crane be operable for emerg:ncy lowering after s sinh e brake handling system should be located in the main cab on l
failure should be two holdmg brakes for stopping and the bndge. Additional cabs located on trolley or !itting 9
controlhng drum rotation. Previsions should be made for devices should have complete control systems similar to manual opeiation of the holding brakes. Emergency the bridge cab. Manual controls for hoisting and trolley brakes or holdmL brakes whkh are to be used fu movement may be provided on the trolley. Manual con-manual lowenng should be capable of operation with trols for the bridge may be located on the bridge. Re-full load and at full travel and provide adequate heat mote control or pendant control for any of these mo-disnpauon. Desijm for rosnual brake operation during tions should be identical to those provided on the bridge emergency iowering should include features to limit the cab contral panel. Provisions and locations should be lowering speed to less than 3.5 fpra.
provided in the design of the control systems for devices for emergency control or operations. ljmiting devices.
The dynamic and static alignment of all mechanical and electrical, should be provided, 'ndicate n.
hoisting machiner; components including geanng, shaft-and control or prevent overtravel and over 4 of ing, couplings, and bearinFs should be maintained hoist (raising or lowenng) and for both tr and throughout the range of loads to be lifted, with all com-bridge travel movements. Buffers for bridge and trolley ponents positioned and anchored en the troUey ma-travel should be included.
chinery platform.
Increment drives for hoisting may be pro.
r.
Safety devices such as hmit type switches o.
vided by stepless controls or inching raotor drive. Plug.
provided for malfunction, inadvertent operation, or fail-ging should not be pernutted. Controls to prevent plug.
ure should be in addition to and separate from the limit-3 gng should be included in the electncal circuits and *he ing means or devices provided for operation in the afore-control system. Floating point in the electrical power mentioned. These would include buffers, bumpers. and 4
system when required for bridge or trouey movement devices or means provided for control of mrdiunction(s).
should be provided only for the lowest operating speeds.
s The operating requirements for all travel p.
To avoid the possibility of overtorque movementt (vertical and ho izontal movements or rota-w'thm the control system the horsepower rating of the tion, singly or in combination) incorporated m the de-sign for pe manent plant cranes should be clearly de-hmng is the momentary oppbcation of fu11line power to the fined in the operating manual for hoisting and for trolley drwe motor for the purpose of promottng a hmited movement.
and bridge travel. The designer should establish the max-
%t punt m the West range of movement control at which imum working load (MWL). The MWI should not be less rmr n on, wn an off and motors in: not energued.
than 85% of the design rated load (DRL) capacity for I'
\\26 \\ D 1.104 7
R the new crane at time of operation. The redundancy in prngram based on the ap[ roved test results and miomw design, design factors ; election of components, and tion obtatned during the testing;it should melude w bdance of auxiliary-ancillary and dual items in the de.
item, as sermin. repan a.d replasement requiremcw dgn and manufacture will provide or dictate the maxi.
sisual examinations, myec uon s, checkmg. rne asm e mum working load for the entical load handlir,g crane ments, problem diagnosis, nondestruetne exarrunatioi.
systems. The MWL should not exceed the DRL for the crane performance testing. and specialinstructions.
Overhead Crane Handling System.
Information concerrung proof testmg on t.
When the permanent plant mane is to be components and subsystems as required and performed used for construction and the operating requirements fcr at 'he manufacturer's plant to senfy the abibt> of comtruction are not identical to those required for pre.
compnents or subsystems to perform should be and manent plant service, the construction operating require-able fe the checking and testmg performed at the Fla c ments should be completely defined separately. The ofinstallation of the crane system.
crane should be designed structurally and mechanically for the construction loads, plant service loads, and their functional performance requirements. At the end of the b.
The c ane system should be prepared for construction period, the crane handling system should the static test of 125% of the design rated load. The tests be adjusted for the performance requirements of the should include all positions of hoisting, lowenng, and nuclear power plant service. The design requirements for trolley and bridge travel with the 1257 rated load and conversion or adjustment may include the replacement other positions as recommended by the designer and of such items as motor drives, blocks, and reeving sys.
rannufacturer. After satisfactory completion of the tem. After construction use, the crane should be thor.
125% static test and adjustments required as a result of oughly inspected by nondestructive examination and the tes', the crane handling system should be given full performance tested. I' allowable design stress limits are performance tests with 10M of the design rated load for to be exceeded during the construction phase, added au speeds and motions for which the syst mis designed inspection supplementing that of regulatory position This should include venfying all hmiting and safety on.
C.I.d should be considered. If the load and performance trol devices. The crane handling system with the design requirements are different for construction and plant rated load should demonstrate its ability to lower and service periods, the crane should be tested for both move the load by minual operation and with the use of phases. Its integnty should be verified by designer and emergency operating controls and devices that have been manufacturer with loat' testing to 125% of the design designed into the handling system.
rated load required for the operating plant before it is The complete hoisting machinery should used as permanent plant equipment.
be aDowed to "two block" during the hoisting test (load block limit and safety devices are bypassed). This rest.
conducted at slow speed without load, should provide u.
Installation instructions should be provided by the manufacturer. These should include a full expla.
assurence of the integrity of the design, the equipment, nation of the crane handling system,its controls, and the the controls, and the overload protection devites The test should demonstrate that the maximum torque that limitations for the system and should cover the require.
ments for installation, testing and preparations for oper.
caa be developed by the dnving system. mclutng the inertia of the rotating parts at the overtorque co tditar.
ation.
wdl be absorbed or controlled prior to two. block:nc 4 Mechanical Check. Testing, and Preventive The complete hoisting machinery should be tested for Maintenance abihty to sustain a load hangup condition by a test in which the load block attaching points are secured to a A complete mechanical check of all the a.
fixed anchor or excessive load. The drum should be ce crane systems as installed should be made to verify the able of one fuu revolution before startmg the hetme method at instauation and to prepare the crane for test.
testing c-The preventive maintenance propam ret-During and after installation of the crane ormnended by the designer and manufacturer snould the proper assembly of electrical and structural com-also presenbe and estabhsh the MWL f or which the crane ponents should be verified. The integrity of all control.
will be used. The maximum workmg load should be operating, and safety systems should be verified as to plainly marked on each side of the crane for each hout-satisfaction of instauation and design requirements-ing unit. It is recommended that the cntical load handling cranes should be continuously mamtained at The crane designer and urane manufacturer DRL capacity.
hould provide a manual of information and procedures for use in checking. testing. and operating the crane. The d.
The cold proot test provided f or m rteula nunaal should also desenbe a preventive maintenance tory positions C.I.b.3 anj 4 should consnt of a penoda gsp
4 dummy load test as follows: Metal temperature of the 1.
Except in those cases in which the appbcant structural members ts:ential to the structural integrity proposes an aJtemathe method for complytng with spec-of the crane handling system should be at or below the ified portions of the Commission's regulatierm th:s guide muumum openting temperature The corresponding will be used in the evaluation of desgn, fabncation. w dummy load should be equal to 1.25 times the max-sembhng, and use of cane systems for entical load imum working load (MWL). If it is not fessble to handling ordered after September 1,1976.
achieve the minimum operating temperature during the teet, the dummy load should be incresud beyond the
& sign rated load 1.5 percent per degree F temperature 2.
For crane handing systems ordered prior to difference. Test frequency should be approximately 40 September 1,1976:
mcriths or less;howver, crane handling systems that an und less frequently than once every 40 months may be grven a cold proof test prior to each use. The cold proof a.
Regulatory pontions C 1, C.2. C.3. and C.4 test should be followed by a nondestructive exarrnnation M11 be used in evaluating crane handling systems that of critical areas for encks.
have been ordered but are not yet assembled.
5.
Quality Assunnce b.
All regulatory pontions except C.I.f. C.3 c.
f, and q will be used in evaluating crane handling systems a.
To the exte-t necessary, applicable pro-that hzve been assembled or may have been used for curement documents should require the crane manufac-handling heavy loads dunng plant construction. Regula-tunt to provide a quality assurance program consatent tory positions C.I.f. C.3.c, f, and q will be used by the with the pertirient provisions of Appendix B. " Quality NRC staff to detemune the extent of changes or modifi.
Assurance Cdteria for Nuclear Powr Plants and Fuel cations necessary.
Reprocescng Plants," to 10 CFR Part 50.
All regulatory positions except C.I.f-C.2.a.
c.
b.
The program should also address each of b, c, and d; C.3.a. b, c, e, f, g, j, n, o, p, q, r, and t will he the recommendaticms in regulatory postions C.1, C.2, used in evaluating crane handling systems that will be or C.3, and C.4 an being used to hsndle heavy loads that are defined as D. IMPLEMENTATION critical. Regulatory positiens C.I.f; C.2.a. b, c. and d, C.3.a. b, c, e, f, g, j, n, o, p, q, r, and t will be usea by The purpo6e of this section 1 to provide informa-the NRC stafY to determine the extent of changes or tion to appicants and licensees reg 2rding the NRC staff's modifications necenary to meet the intent of the regula-plans for using this regulatory guide.
tory podtions.
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APPENDIX ENGINEERING, MANUFACTURING, AND OPERATING STANDARDS, PRACTICES, AND REFERENCES AISE A ssociation ofIron and Steel Engineers (Std.
SAE Society of Automotive Engineers, "Stan-No. 6) dards and Recommended />actices" General items for overhead cranes and Recommendations and practices for wire specifically for drums, reeving systeps, rope, shafting, lubrication, fasteners, blocks, controls, and electrica!, mechani.
materials selection, and load stability.
cal, and structural components.
Copies may be obtained from the Society Copies may be obtained from the Asso-at 400 Commonwealth Dnve, Warrendale, ciation at 3 Gateway Center, Pittsburgh,
/ernsylvania 15096.
Pennsylvania 15222.
CMAA Cyane Manufacturers A ssociation of A meriar AISC American Institute of Steel Construction, (CtfAA 70)
Manual of Stee/ Corrtr.ection-Guide for preparing functional and per-Runway bridge desi badings for impact formance specification and component and structural suppo:.5.
setection.
Copies may be obtained from the Copies may be obtained from the Asso-Institute at 101 Park Avenue, New York, ciation at 1326 F ~
Road, Pitta New York 10017.
burgh, Pennsylvar..,2 3 8.
ASME American Society of Mechanical Engineers NEMA Nc.tional Electrical Manufacturers A sso-References for testing, materials, as~l ciation mechanical components.
Copies may be obtained from the Society Electrical motor, control, and component selections.
at United Engineering Center, 345 East 47th Stieet, ' New York, New York Copies may be obtained from the Asso-10017.
ciation at 155 East 44th Street, New York, New York 10017.
ASTM American Society for Testing and Materials WRTB Wire Rope Technical Board and their manu-Testing and selection of materials.
Copies may be obtained from the Society factunng members for selection of rope, at 1916 Race Street, Philadelphia, Penn.
reeving system, and reeving efficiencies.
sylvania 19103.
Copies may be obtained from the Board at 1625 ist Street, NW., Washington, ANSI A merican Natio nal Standards Institute (A 10.
D.C. 20006.
B3, B6, BIS. B29. B30, and N45 series)
Mill Materials Handling Institute and their mem-N series of ANSI standards for quality ber associations such as Amencan Gear control. ANSI consensus standards for Manufacturing Association for gears and design, manufacturing, and safety.
gear reducers, Antifriction Bearing Manu-Copies may be obtained from the Insti-facturers Association for bearing selec-tute at 1430 Broadway. New York, New tion, e tc.
York 10018.
Copies may be obtained from the Insti-lEEE Institute of Elect ical and Electronics Engi-tute at 1326 Freeport Road, Pittsburgh, neers Pennsylvania 15238.
Electrical power and control systems.
WRC Welding Research Council, "Controlof Steel Copies may be obtained from the Insti-Construction to Acond Brittle Fracture."
tute at United Engineering Center, 345 East 47th Street, New York, New York Copies may be obtained from the Council 10017.
at United Engineering Center, 345 East 47th Street, New York, New York AWS American WelJing Societv (D1.1.72-73/74 l 00g 7.
revisions)
Fabrication requirements and standards WRC Welding Research Council. Bulletm #168, for crane structure and weldments.
"Lamellar Tearing. "
Copies may be obtained from the Society Copics may be obtained from the Council at 2501 NW 7th Street, Miami, Florida at United Engineering Center, 345 East 33125.
47th Street, New York, New York EEI Edison Electricalinstitute 100I7-Electrical Systems.
Copies may be obtained from the Insti-tute at 90 Park Avenue, New York, New Regulatory Guide 1.50, " Control of Preheat Temperp.p-York 10016.
ture for Welding of Low Alloy Steel '
}h k3 1.104 10
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