ML20027D039
| ML20027D039 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 05/31/1982 |
| From: | Kong Y GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20027D035 | List: |
| References | |
| REF-GTECI-A-36, REF-GTECI-SF, RTR-NUREG-0612, RTR-NUREG-612, TASK-A-36, TASK-OR DRF-F13-00023, DRF-F13-23, NSE-50-0582, NSE-50-582, NUDOCS 8210280201 | |
| Download: ML20027D039 (31) | |
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MAa,_kw4 5 0042090 MSE-50-0582 DRF-F13-00023 May 1982 l
1 LIFTING DEVICES AND LIFTING POINTS STRESS ANALYSIS FOR REACTOR PRESSURE VESSEL HEAD STRONGBACK, STEAM DRYER / SEPARATOR SLING AND SERVICE PLATFORM TO COMPLY WITH NUREC 0612 POR PEACH BOTTOM UNITS 2 AND 3 Prepared by
. h.kO n k Y. H. Kong J
System Design 6 Analysis bb eL
_, Revieved by2.Y.(IdND Reviewed by 9
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J. F. Klappr'oth
- f. Choe, Ma//ger Service Licensing System Design & Analysis
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Approved by
/U _ h
/J. Brandon, Manage'r uclear Service Engineering Operation l
l 8210280201 821025 I
PDR ADOCK 05000277 P
PDR I
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0042090 IMPORTANT NOTICE REGARDING CONTENTS OF THIS REPORT NON.~$)
Please Read Carefully The only undertakings of General Electric Company with respect to information in this document are contained in the contract between Philadelphia Electric Company and General Electric Company (reference GE Proposal No.' 424-TY481-HEO) and nothing contained in this document shall be construed as changing the The use of this information by anyone other than Philadelphia contract.
Electric Company, or for any other purposes other than that for which it is intended, is not authorized; and with respect to any unauthorized use, General Electric Company makes no presentation or warranty, and assumes no liability as to the completeness, accuracy, or usefulness of the information contained in this document.
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0042000 TABLE OF CONTENTS P,,agt ABSTRACT 1
1.0 Introduction 2
2.0 NUREG 0612 and ANSI N14.6-1978 Guidelines 3
3.0 Conclusions 5
4.0 Recommendations 6
5.0 Record Search 9
60 Analysis 10 6.1 Assumptions 10 62 RPV Bead Strongback 12 6.3 Steam Dryer / Separator Sling 18 6.4 Service Platform Lifting Points 23 7.0 References 28 O
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0042090 ABSTRACT
'The stress analyses have been performed for equipment handling heavy loads to determine whether the GE supplied lifting devices and lifting points of the Reactor Pressure Vessel (RPV) head strongback, steam dryer / separator sling and service platform of Peach Botton Units 2 and 3 are in compliance with the recommendations of NUREG 0612. The analyses indicate that the RPV head strongback, dryer / separator sling, and the lif ting points of the service platform do not fully meet the guidelines set by NUREG 0612 but exceed the safety factor of the original design criteria to which the devices were designed and built. The components which do not comply with the NUREG 0612 guidelines'are identified. Recommendations to satisfy NUREG 0612 criteria are provided.
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0042090 10 INTRODUCTION In nuclear plant operation, maintenance, and refueling activities, besvy loads may be handled in several plant areas.
If these loads were to drop, they could impact on stored fuel, fuel in the core, or equipment that may be required to achieve safe shutdown or permit continued decay heat removal. 'If sufficient stored fuel or fuel in the core were' damaged and if the fuel is highly radioactive due to its irradiation history, the potential releases of radioactive material could result in cffsite doses that exceed 10 CFR Part 100 limits.
F6r the purpose of NUREG 0612 a heavy load is defined as a load whose weight is greater than the combined weight of a single fuel assembly and its handling tool.
The heavy load stress analysis of the lif ting devices and lif ting points are in response to Philadelphia Electric Company (PECO) request (reference 2) regarding the extent of compliance with the criteria of NUREG 0612 (reference 1).
The purpose of this heavy load stress analysis is to evaluate whether the GE supplied lifting devices and lifting points meet the criteria of NUREG 0612 sections 5.1.1(4), 5.1.6(1) and 5 1.6(3).
The workscope includes (1) search of existing QA records for material mechanical propdr~ ties and any material deviation, (2) field survey to document the hardware as-built configuration, (3) stress calculation to check compliance with NUREG 0612 criteria, and (4) identification of alternatives for PECO to evaluate if non-compliance is indicated.
The following lif ting devices and lif ting points are analyzed:
1.
EPV Head Strongback and Lif ting Points GE drawing #729E413 for both units (reference 3).
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2.
Steam Dryer / Separator Sling and Lifting Points CE drawing #730E146 for Peach Botton Unit 2 (reference 4)
GE drawing #762E152 for Peach Botton Unit 3 (reference 5).
3.
Service Platforz Sling
- and Lif ting Points GE drawing #719E129 for both units (reference 6).
2.0 NUREG 0612 AND ANSI N146-1978 CUIDELINES 1
The sections which are rel,ated to special lif ting devices and lif ting points are as fellows:
2.1 NUREC 0612 5 1.1(4) Special lifting devices should satisfy the aufdelines of ANSI N14.6-1978, " Standard for Special Lif ting Devices f or Shipping Containers Weighing 10,000 pounds (4500 kg) or More for Nuclear Materials." This standard should apply to all special lifting devices which carry heavy loads in areas as defined above. For operating plants certain inspections and load tests may be accepted in lieu of certain material requirements in the standard.
In addition, the stress design factor stated in Section 3.2.1.1 of ANSI N14.6 should be based on the combined maximum static and dynamic loads that could be imparted on the handling device based on charac-teristics of the crane which will be used. This is in lieu of the guideline in Section 3.2.1.1 of ANSI N14.6 which bases the stress design factor on only the weight (static load) of the load,and of the intervening components of the special handling device.
5.1.6(1) Lifting Devices:
(a) Special lif ting devices that are used for heavy loads in the area where the crane is to be upgraded should meet ANSI N14.6 1978, " Standard for Special Lif ting Devices for Shipping Containers Veighing 10,000 Pounds (4500 kg) or More for Nuclear Materials." As specified in Section 5.1.1(4) of this report except that the handling device should also comply with Section 6 of ANSI N14.6-1978.
If only a single lif ting device is provided instead of dual devices, the special lif ting device I
should have twice the design safety factor as required to satisfy the guidelines of Section 5.1 1(4). However, loads that have been evaluated and shown to satisfy the evaluation criteria of Section 5 1 need not have lifting devices that also comply with Section 6 of ANSI N14.6.
- The Service Platform Sling has been replaced with non-GE supplied equipment as indicated in Reference 7.
Therefore, conformance analysis is not iucluded.
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0042090 5.1.6(3) 12torfccing lift points cuch as lifting lugs or cask trunnions should also meet one of the following for heavy loads bandled in the area where the crane is to be upgraded unless the effects of a drop of the particular load have been evaluated and shown to satisfy the evaluation criteria of Section 5 1:
(a) Frovide redundancy or duality such that a single lif t point failure will not result in uncontrolled lowering of the load; lift points should have a design safety factor with respect to ultimate strength of five '(5) times the maximum combined concurrent static and dynamic load af ter taking the single lif t point failure, or (b) A non-redundant or non-dual lif t point system should have a design safety factor of ten (10) times the maximum combined concurrent static and dynamic loads.
2.2 ANSI N14.6-1978 (reference 14) i t
3.2 1 1 The load-bearing members of a special lif ting device shall be capable of lif ting three times the combined weight of the shipping container with which it will be used, plus the weight of intervening components of the special lifting device, without generating a combined shear stress or maximum tensile stress at any point in the device in excess of the corresponding minimum yield strength of their materials at construction. They shall also be capable of lifting five times that weight without exceeding the ultimate strength of the materials. Some materials have yield strengths very close to their ultimate strength.
When asterials that have yield strengths above 80% of their ultimate strength are used, each case requires special consideration, and the foregoing stress design factors do not apply. Design shall be on the basis of the material's fracture toughness, and the designer shall establish the criteria.
6.
Special Lif ting Devices for Critical Loads 6.1 General When special requirements call for the handling of a critical load, the crane performing the hoisting and transporting shall have special features, such as increased stress design factors or a dual-load path hoisting system. The special lifting device used with a crane such as this shall have either of the following:
(1) Load-bearing members with increased stress design factors for handling the critical load (2) A design such that while handling critical loads a single component failure or malfunction will not result in uncontrolled lowering of the load.
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0042090 6.2 Design CritGrio 621 A special lifting device designed with increased stress design f actors instead of a dual-load path shall have its load-bearing members designed with at least twice the normal stress design f actor for handling the critical load.
6.2.2 The attachment from a critical load handling crane with a dual-load path hoisting system to the special lifting device shall be such that two separate and distinct load paths are provided. ~In the event that one path fails, the second path shall continue to hold the shipping container for transport to a setdown area.
The dual-load path attachment points on the special lif ting device shall be so designed that each load path will be able to support a static load of 3W ("W" being the weight of the critical load, including intervening components of the lifting device) plus the impact load due to any weight transfer that occurs due to failure of one load path, without exceeding the yield point of the material.
6.2.4 In the event of a failure of one of the dual-load paths, the weight of the container is transferred from one load path to the other. Any expected increase in stress level shall be within design limits of all components, including those of the crane hoisting system. Provision should be made to minimize the time and distance for load transfer.
6.2.5 If it is intended that the load be shared between the two load paths by maintaining approximately zero slack in either path, then provision shall be included to allow for load-path slack takeup.
6 2.6 The special lif ting device shall be designed to maintain a vertical load balance about the center of lift during its normal attachment.
3.0 CONCLUSION
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The lif ting lugs of the RPV head and steam dryer / separator meet the NUREG 0612 criteria in that the maximum combined load does not exceed the allowable stress based on the ultimate strength of the material with dual load paths.
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0042090 The RPV hand otrengback, dryar/osp3 rotor sling cnd th? lif ting rings of the service platform do not comply with NUREG 0612 criteria in that the resulting stresses exceed the allowable stresses.
The components of the equipment which do not meet the criteria are tabulated in Tables 1 and 2. for the RPV head strongback and dryer /
separator sling. The lif ting rings of the service platform also do not meet the criteria.
4.0 RECOMMENDATIONS 4.1 RPV Head Strongback Preliminary calculations indicate that the strongback can be modified to comply with NUREG 0612 guidelines.
The suggested method of modification is (1) to weld a 1/2" thick plate along both sides of the webs for Sections A and B and on top and bottom for Section D (Figure 2) of the lif ting arms, (2) to replace the l" lifting lug plate with a thicker plate, (3) to replace the turnbuckles with higher rated safe working load turnbuckles, and (4) to replace lower book pin with stronger one.
4.2 Steam Dryer / Separator Sling The steam dryer / separator sling components which failed to satisfy the NUREG 0612 criteria are the wire rope assembly and the 6" wide flanged beam. The wire rope assembly consists of the 1-5/8" diameter 6x19 wire rope, open spelter socket, taper sleeve, thimble and turnbuckle. A larger diameter wire rope assembly, stronger socket pins and turnbuckles are needed to satisfy NUREG 0612 criteria. The 6" beam may be modified by velding a 1/2" plate on each side of the wide flanged beam to decrease the bending stress.
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T TAntE 1 0042090 RPV HEAD STRONGBACK REFERENCE IAAD PATH SATISFY NUREG 0612 SECTIONS Yes No RPV head lif ting lugs
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6.2.1 RPV head strongback hook pin (' lower)
/
6.2.2.1 (upper)
/
hook bor (upper)
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6.2.2.2
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(lower)
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Section A-A*
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6.2.2.3 B-B
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C-C
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D-D
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Lug plate
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6.2.2.4 Shackles
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6 2.2.5 Turnbuckles
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6.2.2.6 l
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- See Figure 2.
RPV Head Strongback Section layout.
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0042090 TABLE 2 STEAM DRYER / SEPARATOR SLING SATISFY NUREG 0612 REFERENCE 14AD PATH TES NO SECTIONS Dryer / Separator Sling Book Box
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6.3.1.1 Book Pin (Upper & Lower)
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6.3.1.2
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6.3.1.3 W Beam
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6.3.1.4 Socket
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,6.3.1.5 Socket Pins
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6.3 1.6 Wire Rope
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6.3 1.7 Turnbuckles Shroud Head / Separator Lifting
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IAIS Dryer Lif ting Lug
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6.3.2 O
0042090 i.3 Service Pintform Lif ting Rings One suggested modification to the service platform to satisfy NUREG 0612 criteria is to replace the three lif ting rings on the service platform with lugs made f rom 1" thick plate with lif ting eyes. With this modification, the hooks in the platform sling may have to be changed to accommodate pin connections.
50 RECORD SEARCH The available records of the* heavy load handling equipment indicates that the RPV head strongback and dryer / separator sling were fabricated at the manufacturer's site. The devices had been load tested, visual and spot dimension inspected before shipment to the reactor site. The load carrying members were inspected for permanent deformation from the load testing. No deformation or cracks were found.
Welding was performed according to the vendor welding procedures by qualified welders. The welder qualifications and approved welding procedures were in the QA record. The structure welds were inspected by magnetic partical method before and af ter the proof test by the manufacturer.
All materials, including structural channels and wide flanged beams (except the hook pins and lif ting rings) are carbon steel per ASTM A
- 36. The majority of the certified mechanical properties in the QA record are for non-essential load carrying members which are not being analyzed.
Most materials used are as specified in the parts list of the drawings or specifications, although a few of the materials were replaced by materials with equivalent mechanical properties.
F 0042090 60 ANALYSIS The RPV head strongback, dryer / separator sling and service platform lif ting rings were not designed for carrying critical loads. Even though the travel path of the crane which carries the heavy load does not pass over the fuel storage pool or the safe shutdown equipment, a
load drop could result in damage to equipment required for safe shutdown or decay heat removal, according to the Section 5 1.6(1) of NUREG 0612. Therefore, the above three heavy load handling devices are considered as carrying critical load >
61 Assumptions The RPV head strongback and the steam' dryer / separator sling are o
considered to be carrying critical load and provided with dual load paths. The lif ting devices should be capable of lif ting the combined static and dynamic loads with two arms (two lif ting points) without exceeding the allowable stresses. Therefore the allowable ' stresses are as follows:
For Lifting Devices (RPV head strongback and steam / dryer separator sling) dual load path * (Section 2 (5.1.6(1))
CAllowable = Q or cu whichever is smaller 3
5 where Cy yield strength Ou ultimate strength
- Dual load path - each load path will be able to support a combined static and dynamic load due to any weight transfer that occurs resulting from failure of one of the load paths.
0042090 Far Lif ting Paints (RPV hsad lif ting lugo and stoca dryer /separctor lifting lugs) dual load path (Section 2 (51.6(3b))
OAllowable = cu, 5
o The service platform lif ting rings were analyzed based on critical load criteria for a single load path. Therefore, the allowable stresses are:
callowable = cyr or 03: whichever is smaller 6
10 o
The allowable shear stress is half of the allowable tensile stress based on maximum-shear stress theory (reference 13).
o A single component failure in the lif ting device will not result in uncontrolled lowering of the load.
o For lif ting devices and lif ting points carrying a critical load with a redundant load path, the safety factor (with respect to the material ultimates strength) is five times the maximum combined static and dynamic loads.
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o The turnbuckles are assumed to evenly distribute the load among lifting lugs by achieving zero slack so that the lifting devices are horizontal during transportation.
o The dynamic load is 15% of the static load for a maximum crane speed of 5 FPM (reference 8).
o Conservative values of field seasured dimensions of Peach Bottom Units 2 and 3 were utilized for one set of stress calculations.
f These calculations are applicable to both units.
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0042090 o
Th2 hack box was d2 sign:d to cecomm:dste tha radundsnt crcna hook design which provides for at least two separate load paths.
o Usually the ultimate and yield strength from the actual material mechanical properties (if available) are higher than the values given in the ASTM specification. Therefore, if the calculated stress is higher than the allowable stress which is derived from the ASTM specification, the allowable stress derived from the actual mechanical properties was used.
6.2 RPV Head Strongback The RPV head strongback is designed for lif ting the RPV head and drywell head in conjunction with the crane hook. The single fa11ure proof hook is not in the scopt of this analysis. The strongback is a cruciform shaped structure with four equally spaced lif ting points and a hook box in the center for engaging it to the crane hook. Turnbuckles and shackles are suspended on each arm for engaging to the lif ting lugs of the RPV head (see Figure I for illustration). The maximum bending moment for this evaluation is considered to be the combined load concentrated on a span equal to the span of the RPV head lugs or the combined load concentrated on a span equal to the span of the drywell head lugs, whichever is greater.
RPV Head Weight Static weight by calculation (which agrees with the value in reference 1).=. 96 tons Combined Load = 1 15 (96 x 2000) = 220.8 kips 6.2.1 RPV Read Lifting Lugs (Quantity = 4)
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0042090
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LIFTINC ARtt CRANE DUAL M00A SUPPORT LEC M00m Pips e5 Mown IN5E RTED) i l
(TYPIC AL OF 71 i
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RPV HEAD STRONGBACK... -
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0042090 Materic1: SA302 GR.B (rafersnca 9)
Minimum Ultimate Stress = 80 kai Allowable Tensile Stress = 16 kai Allowable Shear Stress = 8 kai Applied Load per Lug = 110.4 kips Tangential Force on Lug = 84.2 kips Radial Force on Lug = 71.4. kips Tangential Homent = 673.6 in-kips Combined Tensile Stress = 11.34 ksi < 16 Kai (allovable Tensile Stress)
Tangential Shear Stress = 2.34 < 8 kai (allowable shear stress)
Bearing Stress in Lug = 6.8 < 16 ksi Tension Stress across Hole = 4.3 < 16 ksi Welds are fully penetrated and ultrasonically examined. No calculation is necessary.
Therefore RPV head lif ting lugs satisfies NUREG 0612 criteria.
6 2.2 RPV Head Strongback (CE Drawing #729E413) 6.2.2.1 Hook Pins (Lower Pin) (Quantity = 1) (GE Drawing #131C7969)
Material: ASTM A 519 Ultimate Stress = 120 ksi Yield Stress 'r 100 ksi Allowable Tensile Stress = 24 ksi l
Allowable Shear Stress = 12.0 ksi Estimated Static Weight of the Strongback = 17 tons Applied Load = 1.15 (96 + 17) x 2000 = 260 kips Shear Stress = 14.56 kai > 12.0 ksi (allowable shear stress)
, Bending Stress = 23.5 kai < 24 kai Therefore the lower hook pin does not satisfy NUREG 0612 cri teria.
Book Pins (Upp3r Pins) (Qu ntity = 2) 0042090 The same material is used for the upper hook pins as in the lower book pin. The applied load is reduced by half because two hook pins are supporting the same weight. Pins are undercut 1/4" for the book.
It is conservatively assumed that the undercut is 1/4" around the circumference Shear Stress = 7.28 < 12.0 ksi Bending Stress = 19.7 < 24 ksi Therefore the upper hook pin satisfies NUREG 0612 criteria.
6.2.2.2 Hook Box Material: ASTM A36 Ultimate Strength = 67.8 kai (from certified material properties)
Yield Strength = 43.8 ksi (from certified material properties)
Allowable Tensile Stress = 13.6 ksi Allowable Shear Stress = 6.8 ksi Allowable Bending Stress = 15.0 ksi for "1" sections Allowable Bearing Stress = 2 x a = 27.2 ksi Upper Hook Box Bearing Stress = 9.13 < 27.2 ksi Tensile Stress across the Hole = 6.6 < 13.6 ksi Shear Stress on Plate (tearout) =.81 < 6.8 kai Welds for Hook Box to Lifting Arm = 1 61 < 13.6 ksi Lower Hook Box Bearing Stress = 18.3 < 27.2 kai Tensile Stress Across the Hole = 9.3 < 13.6 ksi Shear Stress on Plate (tearout) = 517 < 6.8 kai The hook box satisfies the NUREG 0612 criteria.
~15-
f 6."2.2.3 Cruciform Arms 0042090 Sections A, B, C, D and E are shown on Figure 2.
Material: ASTM A36 (the allowable stresses are the same as hook box)
Section A Compressive Stress = 13.5 < 15 kai (allowable bending stress)
Tensile Stress = 19.4 > 15 ksi Section B Compressive Stress = 17.4_1 15 ksi Tensile Stress = 17.4115 ksi Section C Compressive 5 tress =963<15ksi Tensile Stress = 9.63 < 15 ksi Section D Compressive Stress = 10.68 < 15 ksi Tensile Stress = 15.81 115 ksi Section E Compressive Stress = 7.67 < 15 ksi Tensile Stress = 7.67 < 15 kai The local / lateral buckling, flange stress, web crippling and web depth have been examined and satisfy the AISC specifications (reference 10) for all above sections.
Sections A, B, and D of the cruciform arms do not satisfy NUREG 0612 criteria.
6.2.2.4 Strongback Lif ting Lugs Material: ASTM A36 Applied Load = 110.4 kips Bearing Stress = 11.11 (RPV Head) < 27.2 kai (allowable bearing stress)
= 8.68 (Drywell Head) < 27.2 ksi Tensile Stress in Plate = 27.19 1 13.6 ksi Shear Stress (tearout) = 6.8 - 6 8 kai Welds for plate to lif ting ars = 3680 lb/in < 3975 lb/in (3975 lb/in is for 3/8" fillet veld subject to transverse load)
-The strongback lif ting lugs do not satisfy NUREG 0612 criteria.,
0042090 M
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Figure 2.
RPV HEAD STRONGBACK SECTION LAYOUT "
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- 6.2.25 3" Ancher Shtekles Crosby Laughlin Cat. #213 Safe working load = 75 tons or 150, kips Applied load (dual load path) = 110.4 < 150 kips The anchor shackles satisfy NUREG 0612 criteria.
6.2.2.6 2-3/4" x 24" Turnbuckles Crosby Laughlin Cat. #G228 Safe working load = 75 kips Applied load = 110.4 > 75 kips The turnbuckles do not satisfy NUREG 0612 criteria.
6.3 Steam Dryer / Separator Sling The steam dryer / separator sling is designed to remove the steam dryer or steam separator assembly and to install it in the reactor pressure vessel during refueling.
The sling consists of a hook box, four wire rope assemblies, a cruciform-shaped structure and four sockets with pneumatically operated lif t pins which engage with the lif ting eyes of the steam dryer or shroud head / separator (see Figure 3 for illustration).
Steam dryer weight (CE drawing #731E711 & 731E157) =
90 kips at 237.5" span Shroud head / steam separator (CE drawing #729E476) =
139.6 kips at 224.75" span Estimated sling weight = 4 Kips l
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0042090
'6.3.1 Dryar/ Separator Sling 6.3.1 1 Hook Box (CE drawing #105D5028)
Material: ASTM A 36 Minimum Ultimate Strength = 58 kai (from ASIM spec.)
f Maximum Yield Strength = 36 ksi Allowable Tensile Stress = 11.6 kai Allowable Shear Stress = 5.8 ksi Shear Stress due to tearout (at hook pin hole) 5 19 (5.8 ksi (allodable shear stress)
=
Tensile Stress across hole = 3.35 < 11.6 i._
Bearing Stress at Plate = 11.75 < 23.2 ksi Welds for plate to hook box = 5 89 < 13.6 ksi The hook box satisfies NUREG 0612 criteria.
6.3.1 2 Book Pins (CE drawing #131C7969)
Material: ASIM A519 Yield Stress = 100 ksi Allowable Tensile Stress = 33.3 kai Applied Load = 166 kips Bending Stress = 27 6 < 33.3 ksi Shear Stress = 9.30 < 16.7 ksi The hook pins satisfy NUREG 0612 criteria.
6.3.1 3 6" W Beam Subject to eccentric loading For carrying the steam separator assembly l
Material: ASTM A36 Allowable Tensile Stress = 11.6 ksi 0
0042090 10" wios PINsUPPORT I
HOOK BOX r.
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1 SECTION A 3
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(FOURPLACES) bN SOCKET (TYPICAL OF 4)
AIR CONTROL VALVE r
100 PSI (7.03 kg/cm ) AIR SUPPLY CONTROL BOX
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Figure 3.
DRYER AND SEPARATOR SLING l i l
A116wJblo B:nding Strass = 13.11 kai Maximum combined stresses due to eccentric loading =
0042090 8.31 < 11 6 ksi (allowable stress)
The wide flanged beam satisifes the axial compression and bending requirements of reference 11 as follows:
f*FI =.13 <.15
[* + (( =.39 < 1.0 where fa = maximum axial stress ib = maximum bending stress Fa = allowable axial stress Fb = Allowable bending stress Therefore the vide flanged beams satisfy NUREG 0612 criteria when subject to combined axial compression and bending stresses for carrying the separator.
For Carrying Steam Dryer Assembly Maximum bending stress = 16. 55 > 13.1 ksi (allowable bending stress)
Maximum axial tension stress = 3.24 < 11.6 kai The vide flanged beams do not satisfy NUREG 0612 criteria. The higher maximum bending stress is contributed by the large moment arm when the dryer is carried.
6.3.1 4 Sockets Material: ASTM A36 Bending Stress on Lug = 3.43 < 11.6 kai Shear Stress on Plate = 1.08 < 5.8 kai (allowable shear stress)
Shear Stress in Eye = 5.50 < 5.8 kai Shear Stress at Pin Holea = 3.46 < 5.8 kai
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0042090 Tscsilo Stress ceroco Eya = 9.86 < 11.6 kai Bearing Stress in l' Plate = 20.75 < 23.2 kei Welds for Lug Plate to beam (applied stress) = 7.93 < 13.6 kai Welds for socket wall to lug plate (applied stress) = 1 94 < 13.6 kai The sockets satisfy NUREG 0612 criteria.
6 3.1.5 Socket Pin (GE drawing #117C4772)
Material: AMS 6414 RC 45-49 Ultimate Strength = 210 kai
- Applied Load = 80.27 kips Allowable bending stress (Plastic design) = 71.41 ksi Allowable Shear Stress = 29.67 ksi Bending Stress on Pin = 88.0 > 71.4 ksi Shear Stress on pin = 26.42 < 29.67 ksi The socket pins do not satisfy NUREG 0612 criteria.
6 3.1.6 Wire Rope Assembly 1-5/8" galvanized 6x19 wire rope Breaking Strength - 103 tons Fittings, such as the taper sleeve, rope thimble, are rated the same.
Applied Load = 90.7, kips Allowable Load = 103 x 2000/5 = 41.2 kips Applied Load > Allowable Load The wire rope assemblies do not satisfy NUREG 0612 criteria.
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I 0042090 "6 3 1 7 [urnbuck!ns (2-1/2" x 24") G228 Safe Working Load = 60 kips Applied Load = 90.7 > 60 kips The turnbuckles do not satisfy NUREG 0612 criteria.
6.3.2 Lifting Lug of the Separator / Dryer (CE drawing #135B9048)
Material: A276 or A479 TP304 J 30 ksi Minimum Yield Strength Minimum Ultimate Strength = 75 ksi m
fl
= 15 ksi
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Allowable Tensile Stress =
Tensile Stress on Lug = 5 5 < 15 ksi (allowable tensile stress)
Bearing Stress - 9.2 < 30 ksi Nut Thread Shear = 3.5 < 15 ksi Screw Thread Shear = 3 9 < 7.5 ksi Tensile Stress in Rod = 11.7 < 15 ksi Welds for Lif ting Lug to Nut (PB2)*
Actual Stress = 3.17 < 13.6 ksi Welds for 3" rod to shroud head (CE drawing #729E476)
Actual Stress = 9.2 < 13.6 ksi The Lifting Lugs satisfy the NUREG 0612 criteria.
6.4 Service Platform Lifting Rings (CE drawing #719E129)
The service platform is designed for general service during a reactor outage. The sling has been replaced with non-GE supplied equipment (reference 7). Therefore, compliance with NUREG 0612 criteria must be evaluated by the sling vendor. There are three lifting rings in the service platform. Two are inclined 45 degrees with respect to the 12" structural channel and one is vertical.
The vertical lifting ring is illustrated on Figure 4.
- Peach Botton Unit 3 lifting lugs are slightly different than Peach Bottom Unit 2 and are well within the safety margin. Therefore, no additional calculation is necessary. '-
0042090 3 * '$ V i N i c k:
rune
- z. Ase'o P
L f
_f l.
- l *
/
5 U
T Y P.
[
E LtF riHG RswG I Dih.
h5'TM
-+
h106,Ct020 STL
- 17. t ~4 0.'?
Ck mu ws.L Figure 4 From force analysis, the vertical ring experiences a higher load than the inclined rings, therefore, only the vertical ring is analyzed.
The ring is assumed as a rigid frame. The method given on Page 122 of Reference 11 vas used.
The drawing (reference 6) does not indicate if the ring material is hot or cold rolled steel of A108 C1020. The analysis assumes that the ring material is cold rolled steel, which gives the maximum yield and ultimate strength. The purpose of this assumption is to indicate that the combined normal stress and bending stress of the ring exceeds the maximum allowable stress with respect to the yield and ultimate strength.. _. -
--.O-.--
n--
r 1
0042090 A11cwsble stress with rcep2ct to yiold strsngth.
8.5 kai allowable
=
Allowable stress with respect to ultimate stress.
allowable =E{0
= 6 1 kai
=
Use 6 1 Kai for allowable tensile stress.
Allowable Shear Stress = 1/2 a - 3.1 ksi g
A11ovable bending Stress = (Shape Factor *) og
= (1.7)(6.1) = 10.37 Ksi The summary of reaction force and moments are as follows:
l
- Shape Factor for plastic design for circular cross Section is 1.7 (reference
- 12) Section 5
0042090 Fax t
g A
L X
F az =
L Lt l
X^
A B
O 8
h
~
1: 1
'M T
- H b L
e 3
A B
Y Vn 1
V S 4.21 in-kips H
=
g 4.82 kips V
=
A B
2.77 kips
=
g M,
5.63 in-kips
=
V
.97 kips
=
g H,
2.990 kipp.
=
g 3.0 inch
=
L 7.75 inch
=
3 d
1.0 inch
=
0'0491 in.
I
=
d/2.= 0.5 in.
C
=
I/C = 0.098 in.3 2
=,
l I
c 0042090
~
End "A"
4, p
k J
4 il l
3 7 = 4.71 > 3.1 kai A
Shear Stress =
Normal Stress = {A = 6.133 ksi Maximum bending Stress = +43 ksi Maximum combined Stress = 4 9'.14 > 10. 37 kai
~
End ~B" Normal Stress = 1 24 kai Bending Stress = + 57.43 ksi Maximum Combined Stress = 58.67 > 10.37 ksi Shear Stress - 5 08 < 3.1 ksi The lif ting rings of the service platform do not satisfy NUREG 0612 criteria.
e oW*.
0042090
7 0 REFERENCES 1.
NUREG 0612. " Control of Heavy Loads at Nuclear Power Plants".
July, 1980 2.
GE Proposal #424-TY481-HE0 " Analysis for Determination of Conformance of GE Supplied Lifting Devices to NUREG 0612", dated September 16, 1981 3.
RPV head strongback 729E413 4.
Steam Dryer / Separator Sling (PB2) 730E146 5.
Steam Dryer / Separator Sling (PB3) 762E152 6.
Service Platform (719E129) 7.
GE Letter G-BE-1-209, dated December 14, 1981 8.
CMAA Specification #70 9.
RPV Head Drawing 131873E Rev. 5 (A/E) 10.
The Manual of Steel Construction (AISC) 7th ed.
11.
Roark & Young " Formulas for Stress and Strain" 5th ed.
- 12. Mark's Mechanical Engineering Handbook, 7th ed.
13.
J. E. Shigley, " Mechanical Engineering Design", 3rd ed.
- 14. ANSI N14.6-1978,' American National Standard for Special Lif ting Devices for Shipping Containers Weighing 10,000 Pounds (4500 Kg) or more For Nuclear Materials" O
p # *~
~28-
.-