ML20214T588

Long Term Support of Cables in Vertical Cable Trays

ML20214T588
Person / Time
Site:	Vogtle
Issue date:	05/26/1987
From:	GEORGIA POWER CO.
To:
Shared Package
ML20214T563	List: ML20214T559 ML20214T588
References
NUDOCS 8706100332
Download: ML20214T588 (25)

Text

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V0GTLE ELECTRIC CENERATING PLANT UNITS 1 AND 2 GEORGIA POWER COMPANY LONG TERM SUPPORT OF CABLES IN VERTICAL CABLE TRAYS BECHTEL WESTERN POWER CORPORATION MAY 26, 1987 8706100332 yO M PDR ADOCK OsOOO424 p PDH

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TABLE OF CONTENTS Page ,

1.0 Introduction 1 2.0 Methodology 2 3.0 Long Term Support of Cables in Long Vertical Trays 3 3.1 Description of Stainless Steel Cable Ties 4 ,

l 3.2 Testing on Stainless Steel Cable Ties 5

} 3.2.0 Test Set-up 5 t

i 3.2.1 Test Series 1 5

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3.2.2 Test Series 2 6 3.2.3 Test Serics 3 e7 3.3 Load capacity of Stainless Steel Cable Tie 7 i

! 3.3.1 Capacity of the Cable Tie - Strength Considerations 7 I

3.3.2 Capacity of the Cable Tie - Cable Damage 9.

l Considerations I

3.4 Safety Factors Under Design Loading Condition 11 3.5 Installation of Stainless Steel Cable Ties 11

] 4.0 Conclusion 12 i

l Tables 13.

4 l Figure 19 t

l Appendix A A-1 I

Attachment - Panduit Catalog Excerpts Att.-1  !

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,2 LONG TERM SUPPORT OF CABLES IN VERTICAL CABLE TRAYS

1.0 INTRODUCTION

In Supplement 4 to Vogtle Safety Evaluation Report (SSER 4), the Nuclear Regulatory Commission (NRC) staff identified an open item i ,

regarding the seismic adequacy of plastic cable ties used to support Seismic Class 1E cables in long vertical cable trays. 'Long vertical -

cable trays are defined as those which exceed 25% of the support spacing intervals shown in Table 300-19(a) of the National El ctric ,

Code, (eg: for trays containing cables with No. 18 through No. 0 ,c copper conductors, a long vertical tray is any riser greater than or equal to 25 ft). In response to this open item, Georgia Power Company (GPC) initiated a two-part program. The first part addressed the use of Panduit plastic ties for the short term, i.e., for the 7,

first fuel cycle. The second part, which is the long term program. -

is to address the adequacy of the cable ties over the life of the i facility.

In letter GN-1247 dated December 22, 1986, GPC provided the technical <

N justification for the use of Panduit plastic cable ties for the short term. This response addressed all the concerns raised in the NRC

• 1etter dated December 3, 1986. Based on the evaluation of this '

response, the NRC staff concluded in SSER 5 that the use of Panduit

~h plastic cable ties was an acceptable method of seismically supporting ,

cables in vertical cable trays. The staff identified the long term adequacy of the plastic cable ties as a confirmatory issue for the e

s I period beyond first fuel cycle. Specifically, the long-term aging 4608V 1

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and relaxation effects on the adequacy of the plastic cable ties had to be addressed by GPC by June 1, 1987.

2.0 METHODOLOGY s The methodology used to support the cab 1@ in long vertical trays for the long-term will be the same as that used for the short-term, i.e.,

['q use of cable ties. However, ra her than having to establish the long-term aging and relaxation etfects on the Panduit plastic cable ties, GPC intends to use Panduit stainless steel cable ties for the long-term support of cables. Thus, the issue of long-term aging and relaxation effects on cable. tie performance is eliminated as an .,

issue, since stainless steel ties are notiaffected by these factors.

s in 'order to qualify stainless steel ties, for <iupport of cables in long verticai trays, the issues raised by the NRC staff,on the short-term support of cables using Panduit plastic cable ties in ..

their letter dated December 3, 1986 and the response provided by GPC

' in' letter GN-1247 dateJ December 22, 1986 have been reviewe The following are the highlights of this evaluation done for thE short-term support using Panduit plastic cable ties.

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o Adequacy of the cable ties can be determined based on the capeity of an individual cable tie and the associated tributary

[ loading on that tie. This is supported by the observed flexibi1{tyofthecablesunderdynamictesting.

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i o The capacity of the cable tie can be determined from static testing by applying a cyclic pull-out load along the length of the cable bundle. This method applies the load to the cable tie in the most unfavorable direction. The earthquake design load on the cable tie can be calculated using the equivalent static method.

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4 o Slippage of inner cables relative to the bundle was determined 1

not to be a credible concern.

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.o Establishment of an adequate safety factor should take into l

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consideration the as-built cable tie spacing and cable bundle l I

diameters. l l

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The above conclusions and requirements are also applicable to the I Panduit stainless steel cable ties, with the proviso that static cyclic pull-out testing be performed on this tie to determine its load capacity. Additionally, the maximum allowable loading on the tie should be such that no unacceptable cable damage occurs under design loading conditions.

I 3.0 LONG TERM SUPPORT OF CABLES IN LONG VERTICAL TRAYS l In order to eliminate the long term environmental effects as a potential concern. GPC has decided to use Panduit stainless steel cable ties to support the cables in long vertical trays. This-section describes the stainless steel cable tie, the testing done to determine its load capacity, the calculation of safety factors under design conditions, and the installation procedure to be used.

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3.1 Description of Stainless Steel Cable Ties The Panduit stainless steel ties to be used for the long term support of vertical cable at VEGP are constructed out of non-magnetic type 302/304 stainless steel having a rated tensile strength of 125,000 to 150,000 psi (at 73*F). VEGP will use Panduit part number MLT*H-LP ties that are 0.31 inch wide, 0.01 inch thick and are of varying lengths, as required (the

• is to be replaced with the maximum allowable bundle diameter, e.g. , 2, 4, 6, etc. , inches in diameter).

The locking mechanism on the tie utilizes a stainless steel ball that is permanently entrapped in the head portion of the mechanism. When locked on a bundle, the ball, working in conjunction with an angled ramp on the head, provides a positive mechanical wedge locking action that secures the tie in place. The tie is installed under tension with a Panduit installation tool that automatically applies proper tension in the tie before cutting the excess tie length. When installed over resilient material (such as cable), the cut edge of the tie is flush with the locking mechanism thus preventing any sharp edges from coming in contact with adjacent cables. Excerpts from the Panduit catalog are included as attachment to this report for reference.

Panduit maintains an internal quality control program to ensure that the stainless steel ties are manufactured to high quality standards f rom quality controlled raw materials. Material certifications l

showing the analysis of material are maintained by Panduit.

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3.2 Testing on Stainless Steel Cable T!as 3.2.0 Test Set-up The test set-up (see Figure 1) used for the stainless steel tie testing is the same as that used for the testing of plastic cable ties. A section of cable tray was oriented in the horizontal position and inverted so that the cable weight would hang from the cable tie. The hanging cable weight simulates the lateral seismic loads (resultant of two horizontal earthquake components) on vertical cables. The distance of 17' between the pulleys provided a 1.7g resultant lateral load on the tie for a 4'-0" standard tie spacing.

Dynamometers were installed at each end of the cable to monitor the axial load being applied to the cable. The dynamometer has a drag device that indicates the force (e.g., 220 lbs) being applied at tie failure.

3.2.1 Test Series 1 As was done for the plastic cable tie testing, four VEGP cable configurations were tested: a small cable (A27 cable code, 0.144 lbs/ft., 0.487" dia.); a large cable (81L cable code, 1.34 lbs/ft.,

0.964" dia.); a small bundle of 4 cables (1.02 lbs/ft.: 1.38" dia.

total); and a large bundle of 34 cables (5.1 lbs/ft., 3.25" dia.

total). These configurations were selected as a representative cross section of bundle sizes installed at Vogtle.

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I Reverse loading techniques were employed in_these tests; that is, the load was applied in one direction and then in the reverse direction.

Loading was increased in 25 lb increments af ter testing in each direction was completed, until failure of the cable tie occurred.

Test results for this test series on the four cable configurations are presented in Table 1. Evaluation of these data to determine the load capacity of the stainless steel cable tie is presented in Section 3.3.1.

3.2.2 Test Series 2 In the process of performing Test Series 1, it was observed that significant cable damage occurred at a load above 250 lbs in one of the 34 cable bundle specimens. Therefore, a second test series was l

Initiated on the 4-cable and 34-cable bundles, with the objective of i

establishing a limiting load up to which unacceptable cable damage does not occur and thus eliminating the possibility of unacceptable l l

damage as a concern. l 1

l Since it is difficult to examine the cables for damage during the test without disturbing the cable tie, the following approach was used. A target load value of 225 lbs was pre-selected as the anticipated upper limit of the capacity that would be required.

Starting at a load of 150 lbs, alternating the load left and right, the loading was increased by increments of 25 lbs until tie failure or 225 lbs was achieved, whichever occurred first. The cables were then examined to determine whether any cables were damaged.

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Test results from this test series are presented in Table 2. None of-the test specimens showed any unacceptable cable damage, even when 1

they were subjected to a load of 225 lbs. Further discussion on this subject is provided in Section 3.3.2. l 1

3.2.3 Test Series 3 i

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Since the governing design cases occur with larger diameter cable bundles (because of greater weight per foot), it was decided to test l a 47-cable bundle (7.8 lbs/ft, 4" dia. total) for cable tie capacity. Starting at a load of 75 lbs, alternating the load left l and right, the loading was increased by increments of 25 lbs until tie failure occurred.

l Test results from this test series are presented in Table 3.

Examination of the test specimens showed that none of the cables )

i exhibited unacceptable cable damage. Evaluation of these test l

results to determine the load capacity of the cable tie is provided in both Sections 3.3.1 and 3.3.2.

3.3 Load Capacity of Stainless Steel Cable Tie 3.3.1 Capacity of the Cable Tie - Strength Considerations In this section, the results from Test Series 1 and 3 are evaluated to determine the design load capacity of the cable tie.

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Table 4 provides the sample mean, standard deviation and mean minus one standard deviation values of load capacity of test samples for the five configurations of cables / bundles. In addition, the safety factors under dead load and Safe Shutdown Earthquake (SSE) Joad, using the nominal tie spacing of 4'-0" and maximum applicable seismic acceleration, are provided in this table. The safety factors were calculated using sample mean minus one standard deviation load as the capacity of the cable tie. It is seen from this table that, due to the high safety factors (i.e. 10 or greater), the small cable, large cable and the 4-cable bundle need no further evaluation.

The test data obtained from testing of 34-cable and 47-cable bundles (20 specimens f rom Test Series 1 and 3) are used as the basis for determining the design load capacity of the large cable bundle tie.

Test Series 2 (Table 2) values are not included in the above sample simply because tne test was not designed to establish tie capacity.

As described in Section 3.2.2, the purpose of Test Series 2 was to explore the damage to the cables at a preselected level of loading.

First, the mean load capacity and standard deviation are calculated for the 20 specimens. The sample mean load capacity is 278.3 lbs and l

the sample standard deviation is 49.5 lbs. From these, the mean load I capacity and standard deviation for the total population at a 95%

confidence limit are calculated using the methodology described in Appendix A.

For design purposes, the mean and standard deviation have been calculated for the total population of stainless steel cable ties in 4608V 8

the plant. For the total population of large bundles, the mean load capacity is reduced to 259.1 lbs. and the standard deviation is increased to 67.8 lbs at 95% confidence limit. The mean minus one standard deviation load is 191.3 lbs.

For design purposes, 175 lbs. will be used for large cable bundles as the conservative design load capacity for the stainless steel cable ties. This is the minimum load achieved in the testing of 34-cable and 47-cable bundles considering all of the test data, including Test Series 2. This corresponds to a mean minus 1.24 standard deviations. This value is well below the 250 lbs specified by Panduit as the minimum loop tensile strength based on mandret tests.

3.3.2 C.ipacity of the Cable Tie - Cable Damage Considerations The examination of cable specimens from Test Series 2 and 3 shows that cable damage is not a credible concern for loads within the design load capacity used for the cable tie. Prior to beginning test series 2 and 3, damage levels were defined as follows:

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1) Abrasion - Slight blemishes / roughening of the cable jacket surface. May include indentations.

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2) Nick - Damage consisting of surface type cuts in the cable jacket that do not significantly penetrate the jacket.

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3) Slice - Cable jacket damage in which the Jacket is significantly penetrated but is not cut through to the cable shield (if applicable) or conductor insulation.

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4) Damaging Cut - Damage consisting of' cuts in the cable jacket  !

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that completely cut through the jacket exposing or damaging the 4

cable shield (if applicable) or conductor insulation.

Acceptability of any cable jacket damage was determined by a l registered professional electrical engineer based on a visual 1

inspection of the tested cables. Damage levels 1 through 3 were -

considered to be acceptable damage since they do not affect electrical performance of the cable. No unacceptable damage was 4

found in any of the tests performed in Test Series 2 or 3. Details of the results of these test programs are provided in Tables 2 and 3.

1 i As shown in Table 2, the 4-cable and 34-cable bundles wnen subjected to loading up to 225 lbs. did not show any unacceptable cable 1

damage. For the nominal spacing of 4'-0" and under the maximum applicable SSE acceleration, the load of 225 lbs. corresponds to a safety factor of over 15 for the 4-cable bundle and over 3 for the 34-cable bundle. The 47-cable bundle specimen (refer to Table 3),

I j when subjected to loading of up to 400 lbs corresponding to a safety

!~ factor of over 3, did not exhibit any unacceptable cable damage.

Therefore, based upon the damage testing performed and the 1

conservative design load capacity of 175 lbs. used for the cable ties, the occurrence of unacceptable damage to the cable is not

) considered credible.

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3.4 Safety Factors Under Design Loading Condition f

Considering the fact that the sample mean and standard deviation were modified to extrapolate to the total population and that a design value of 175 lbs was conservatively selected, it is concluded that a safety factor of 1.3 is more than adequate.

i For illustrative purposes, the safety factors of'the test samples are calculated using a nominal 4'-0" tie spacing and the maximum applicable plant seismic accelerations and are shown in Table 5.

(The plant has been divided into three seismic zones, Zone I, Zone II and Zone III, with Zone III having the highest accelerations. The

acceleration values applicable for seismic Zone III were used. ) As ,

i seen from this table, the sample cables have safety factors significantly higher than 1.3. However, the safety factors for i actual plant conditions will vary depending on the bundle weights and t

the associated cable tie spacings (within a range of 3'-6" to 5'-0")

and the associated seismic acceleration values for the applicable 1

plant locations. Nevertheless, a minimum safety factor of 1.3 will be maintained for all cases.

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3.5 Installation of Stainless Steel Cable Ties 1

Prior to the installation of the stainless steel ties, craftsmen will be trained in the installation criteria and the proper use of the Panduit installation tool. Prior to shipment, each tool is l

calibrated by Pandult. The tool will be used within the calibrated life recommendations made by Panduit.

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Where required in Unit 1, the existing bundle sizes and/or tie spacing will be adjusted during the installation of the stainless steel ties to maintain the required 1.3 safety factor. Installation of these ties will be completed prior to the restart of Unit I after the first refueling outage.

In Unit 2, which does not have significant quantities of cable installed at this time, nylon ties will be used for interim support and for cable placement to maintain bend radius, neatness, etc.

Installation of stainless steel ties will be performed during the final stages of construction in accordance with the schedule for area turnover to operations. Bundle size and tie spacing will be controlled during the installation of the stainless steel ties such that the above safety factor requirement is met.

Table 6 provides an exampic of the type of guidelines that will be used to ensure that bundle sizes and tie spacing will provide the required safety factor. Quality Control verification of bundle diameter and tie spacing conformance to design requirements will be performed after installation of the stainless steel ties.

4.0 CONCLU$ ION It is concluded that use of Panduit stainless steel ties in the manner described in this report provides conservative long-term support of the cables in long vertical cable trays.

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TABLE 1 TEST SERIES 1 - RESULTS MAXIMUM LOAD PRIOR CABLE TO FAILURE FAILURE MODE (LBS) i i

A27 Small Cable 75, 125, 150 Slip at the tie 0.144 lbs/ft. .150, 150 0.487" dia.

1 81L Large Cable 200, 225, 225 Tie failure 1.34 lbs/ft. 250, 250, 175 0.964" dia. .

4-cable Bundle 225, 250, 225 Tie failure 1.02 lbs/ft. 225, 250 1.38" bundle dia.

34-cable Bundle 250, 300, 275 Tie failure i 5.1 lbs/ft. 220, 220 3.25" bundle dia. 300, 300, 250 225, 250 l

NOTES: Most of the tie failures occur as a result of the failure of the latch mechanism.

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TABLE 2 TEST SERIES 2 - CABLE DAMAGE DATA 1

CABLE LOAD ACHIEVED IN LBS (DAMAGE LEVEL) 4-cable Bundle 150 (2), 175 (2), 175 (2), 175 (2), 200 (2),

1.02 lbs/ft. 150 (2), 150 (1), 150 (1), 175 (1), 150 (2),

i 1.38" bundle dia. 225 (2',, 150 (2), 200 (2) 34-cable Bundle 175 (1), 200 (2), 225 (1), 225 (1), 175 (1),

5.1 lbs/ft. 225 (2), 225 (1), 175 (1), 200 (1), 225 (1),

3.25" bundle dia. 225 (1)

Damage Levels: 1) Abrasion 2) Nick 3) Slice 4) Damaging Cut See Section 3.3.2 for detailed description of damage levels Damage levels 1 through 3 are acceptable damage levels since they do not affect the electrical performance of the cable.

NOTE: The tests for which 225 lbs. is identified as the load achieved were concluded even though no tie failure occurred.

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l TABLE 3 TEST SERIES 3 - RESULTS I

i MAXIMUM LOAD PRIOR CABLE TO FAILURE FAILURE MODE I '

(LBS) 4 47-cable Bundle 225, 275, 225 Tie failure 7.8 lbs./ft 325, 250, 400 (Mostly, failure 4" bundle dia. 325, 275, 325 of the latch 350 mechanism) i NOTES: No unacceptable cable damage.was observed in any of the above specimens.

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TABLE 4 '

i LOAD CAPACITY OF TEST SAMPLES SAFETY FACTOR STANDARD MEAN USING 4'-0" TIE MEAN DEVIATION MINUS SPACING LOAD (SIGMA) SIGMA DEAD DEAD + SSE

, CABLE LBS LBS LBS LOAD LOAD

A27 Small Cable 130 32.6 97.4 168 47 1

0.144 lbs/ft 1

81L Large Cable 220.8 29.2 191.6 36 10 1.34 lbs/ft 4-cable Bundle 235 13.7 221.3 54 15 1.02 lbs/ft.

34-cable Bundle 259 32.9 226.1 11 3.1 5.1 lbs/ft i

47-cable Bundle 297.5 57.1 240.4 7.7 2.1 7.8 lbs/ft l

4 1

NOTES: Safety factors were calculated using mean minus sigma load as the l capacity of the cable tie.  !

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TABi.E 5 SAFETY FACTORS OF TEST SAMPLES'**

SAFETY FACTOR USING 4'-0" TIE SPACING DESIGN LOAD CAPACITY DFAD DEAD + SSE CABLE (LBS) LOAD LOAD A27 Small Cable 75 130 36 0.144 lbs/ft 175'*'

81L Large cable 33 9 1.34 lbs/ft 4-cable Bundle 150'*' 37 10 1.02 lbs/ft 34-cable Bundle 17 5 ' ' '. 8.6 2.4 5.1 lbs/ft 47-cable Bundle 175 5.6 1.6 7.8 lbs/ft NOTES: (1) Safety factors were calculated using the design load capacity identified in this table.

4 (2) Design load capacity is taken as the minimum of the maximum loads successfully achieved prior to failure.

(3) Design load capacity is based on the statistical evaluation (Section 3.3.1) with additional conservatism to reflect the minimum of the maxisum loads successfully achieved in the test *ng of large cable bundles.

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i TABLE 6 TYPICAL CABLE BbNDLE DIAMETER CRITERIA CABLE TYPE: CONTROL AND INSTRUMENT SAFETY FACTOR 1.3 TIE CAPACITY: 175.0 CABLE TIE USED: PANDUIT MLT*H-LP (STAINLESS STEEL)

TIE BUNDLE DIAMETER SEISMIC SPACING (INCHES)

ZONE (FEET) LBS/FT SEE NOTE 1 I 3.5 20.1 5.6

, 4.0 17.6 5.3 4.5 15.7 5.0 5.0 14.1 4.7 II 3.5 12.9 4.5 4.0 11.3 4.2 4.5 10.0 4.0 5.0 9.0 3.8 III 3.5 10.7 4.1 4.0 9.3 3.8 4.5 8.3 3.6 5.0 7.5 3.4 NOTE: 1. Bundle diameters shown are for the densest control or instrument cable used in safety related applications.

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has a X 2 distribution and hence o1 5A (largest standard deviation) xe 2

For a sample size of 20, x 0.05 = 10.1 (19 degrees of freedom), and X = 3.18. At this confidence limit O.05 = V1 I o<

/19 -S = 1.37 S 3.18 i

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radiation, or temperature extremes exist a Use indoors, outdoors orf M85 @

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• HWCUIT Stainless Steel Clamps and Strapping PAN-STEEL ~ CLAMPS Bias Tip oesign  %"l*llell,",'l$' :o instatiation This tip des.gn

-STOCK SIZES /  !=";'n"*'!"re,s f tne initialinserton force

• Speed installation time-no pre-assembly required. required The smarier standard size provides these features a Supplied in dispenser boxes.

• tn ene sc,uare to cesign 4 Max Min. l.oop -

PANDUli Part Number -  : Bur. die ,

• Approv. . Approx.- Tensile f , flecommended 302/304, - . 316- , mDia. C 'Lengt.. Width Strength . f PANDUlT*

Stainless - ~- Stainless In. s . In. -

In.. Lbs.A- . Insta'tation

' Steel ~ Steel (mm) - * (mm) - (mtr) (N)' Tool Part No. Package Oty.

Standard Cross-section-Minimum Bundle Diameter .75" (19mm) 1 CE l l

MLT2S-CP MLT2S-CP316 2.00 (50) 7.9(201) 100

.18 100 O 100 MLT4S-CP MLT4S-CP316 4.00(102) 14.2(360) STMT or t4 6) (4451 HTMT 100 MLTCS-CP MLT6S-CP316 6.00(f 52) 20.4 (520)

MLT8S-CP MLT8S-CP316 8.00(203) 26.8(679i 100

Heavy Cross-section-Minimum Bundle Diameter 1.00" (25mm)

Gl{,f[; * ' ' V jff V V f -

MLT2H-LP MLT2H-LP316 2.00 (50) 7 9(201) 50 I

MLT4H-LP MLT4H-LP316 4 00(102) 14.3(362) - 1 GS4MT 50 i

MLT6H-LP MLT6H-LP316 6 00(152) 20 5(521) ('7 ) (111b 50 J 3 'hT or MLT8H-LP MLT8H-LP316 8 00(203) 26 8(6791 50 MLT10H LP MLT10H-LP316 10 00(254) 33 0(638) 50 xv8.m e,es in aceo,oance wm uit smno oc s%o m., ore,s cusiom sec cr.s car o. ,earutarvan-eva ci rec ory ior er -s.m ece-am <"s

-Continuous Banding

• Provides custom large s.ze diameters.

= Gives versatility on the job site for any diameter with minimum inventory

• Two styles of closures, each with the unique PAN-STEEL locking feature.

MBH Banding Heavy cross-section .31* (7.9mm) wide,302/304 mater;al Bn supplied in reels of 1000 f t. (304.8m). To use, pull out as much banding as needed*; cut of f with GS4MT tool with the CAMT accessory (or w th shears) and install with r: Panduit ' i Pkg.

MTHH or MLTHC cicsure method. l Part Number l Oty_

' 000 j Banding Closure 'Determerng Length Required] l VBH M g g Diarr aer (anches) x 314 MTHH + 3 nches

}

MBH ,

MLTHC DAnew Onenes) x 314

-9 inches na

.- MTHH Bending Heads Individual locking heads. Io use. slip he&d Onto Danding; Panduit Pkg. 7 y turn back extended band to hold head in place Part Nutrber Oty .

M T HH-C 100

.g  ; install upside 00wn 10 V

. . - - -- ' i' disengage 001:

g" MLTHC Coupler An alternative closure metncd The coup.ers ~5dult Pkg.

. are pre-assemoied 12" (304.8mm) length? witn Part humber Oty.

herJs attached at both ersds. This convenent ~lTHC.[P V 50 trette,d saves pn banding and is faster to 4 sit --

insta.i

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