ML20235F985

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Trip Rept of 870623 Visit to Culver City,Ca Re Testing of Conduit Clamps at Anco Engineers,Inc.List of Meeting Attendees Encl
ML20235F985
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 07/01/1987
From: Terao D
NRC OFFICE OF SPECIAL PROJECTS
To: Charemagne Grimes
NRC OFFICE OF SPECIAL PROJECTS
Shared Package
ML20235F988 List:
References
NUDOCS 8707140061
Download: ML20235F985 (29)
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NUCLEAR REGULATORY COMMISSION

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WASHINGTON, D. C. 20555 t

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Docket Nos'.: 50-4452 g7

'50-446, i

MEMORANDUM'FOR:- Christopher I.= Grimes " Director >

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Comanche Pesk Project Division.

Office of Special Projects

"THRU
--

James Ed Lyons, Assistant Director syff7 for Technical Programs m

Comanche Peak Project Division, OSP:

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i FROM David:Terao, Mechanical Engineer.

Comanche: Peak Project Division, OSP:

SUBJECT:

TRIP: REPORT

SUMMARY

ON ANC0 TESTING OF CONDUIT CLAMPS FOR' COMANCHE PEAK.

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10n June 23, 1987, the NRC staff-(D.'Terao and J. Lyons) and its consultant (Dr.

W.,P. Chen) discussed'with'TU Electric:the; testing of.CPSES conduit clamps to 4

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^be conducted at'ANC0 Engineers, Inc. (Culver City, CA). 'The two: types.of; conduit clamps which were scheduled to.bettestedLincluded UNISTRUT clamp types-P2558 and C708S.; The conduit. sizes ranged from 3/4-inch diameter to 5-inch diameter. with various bolt sizes.and baseplate anchorages. A total of 15 different test combinations were to be conducted at ANCO over a period of approximately.one month. The staff witnessed 3 of the'15 test combinations

, 2

'during its' visit.

The objectives'of the 15 conduit system tests-were.to establish a better defin-ition'of clamp capacities under simultaneously application of three orthogonal

, dynamics loadings gd to determine the torsional resistance 'of the clamps under seismic loadings. -

Conduit spans:of 14 feet were used;in the: test and' represent upper bound spans to those actually installed at CPSES. The conduits'~

were: filled with electrical wires.. The tests were conducted at three input amplitudes representing'approximately 1) SSE, 2) 1.5 x SSE (half level

' fragility), and 3) 2.0 x SSE-(full level fragility). Additional tests.with

~ added mass on the conduit spans to simulate higher SSE loadings - up to 4 x SSE

-Lwere also conducted to establish failure load levels in the conduit clamps.

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Previously, conservative static tests and three directional piston-driven

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cyclic' tests were conducted at Corporate Consulting' & Development Company, Ltd.

(Raleigh, NC) for'CPSES to establish. allowable'19 ads for conduit supports. These allowable loads are 'used in the project design criteria.

f However some conduit systems, specifically those with thennolag or thermo E

blanket, have calculated clamp loads in excess of.one or more allowable load. "The'ANCO tests were conducted to address these cases.

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L' The staff witnessed two tests - one at 1.5 x SSE and another at 2.0 x SSE.

Li During the first test (1.5 x SSE), one of the two bolts to which the clamp is secured, failed at the baseplate weld.

(The bolt is actually a short 1/4-inch diameter threaded rod which is fused to the basep' late by a special tool.) The cause of failure was attributed to improper installation of the bolt since the l

clamp in which the bolt failed cid not experience the maximum system load. A new bolt was reinstalled and the clamp system was tested at 2.0 x SSE. The bolt did not fail during the second test. Torsional slippage occurred during both tests in the.1-inch conduit system.

No torsional slippage was observed in the two 3/4-inch conduit systems. ANCO will use the test results to establish the torsional' resistance values for the clamps.

A final test report will be J

issued which will contain the results of the 15 conduit system tests.

During our visit, TU Electric also presented a summary overview of the cable tray dynamic-tests conducted by ANCO.- A video tape of the cable tray tests and previous conduit support tests were shown. The cable tray tests were conducted to-investigate the variation of clamping as a function of cable fill and to provide a basis fnr validating analytical models.

A total of 24-staff-hours were involved in this effort. No open or unresolved items were identified at this time since a more detailed review will be per-formed when a final test report is available for the conduit clamps. A list of attendees is included in Attachment 1 to this memorandum. A copy of the agenda and handout-is included in Attachment 2 to this memorandum.

8 David Terao, Mechanical Engineer Comanche Peak Project Division, OSP : List of Attendees : Agenda cc:

Dr. W. Paul Chen Energy Technology Engineering Center P. O. Box 1449 Canoga Park, CA 91304 i

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. Attachment 1

- Discussions at ANC0' June 23, 1987 w,

Name Affiliation l

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.Ebasco l

' S. W.. Harrison TV Electric J. W. Muffett

.TV Electric E. A;;Wais-Tenera

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George E. Howard

.ANC0 Engineers D.;W. Leigh

~TV Electric-QA' J. E. Lyons USNRC D. Terao

'USNRC-W P6ul-Chen

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Consultant'-

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N Distribution:

Do'ket File (50-445/446)~'

c CPPD readingi

.OSP' reading..

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e J. G. Keppler

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J. A..Axelrad C. I.- Grimes:

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. H. Schierling j

' Melinda Malloy:

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'D. Terao lJ. Lyons g

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F TU ELECTRIC COMANCHE PEAK.SES DISCUSSIONS AT ANCO LABS i

i JUNE 23, 1987 I

AGENDA 1

1.

' INTRODUCTION (JM) w 2'.

CONDUIT. SYSTEM VALIDATION PROGRAM CONDUIT CLAMP DYNAMIC TESTING

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3.

DESCRIPTION

'OF.

DYNAMIC C_O N D U I T. CLAMP.

TESTS (GH) l l

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    • RECESS TO OBSERVE '1/ 2 LEVEL FRAGILITY

. TEST **-

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4.

REVIEW OF PRELIMINARY CLAMP TEST RESULTS (EO) 1 5.

OVERVIEW OF CABLE TRAY DYNAMIC i

TESTS

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VIDEO TAPE VIEWING OF TRAY TESTS AND CONDUIT CLAMP TESTS ~ -

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    • RECESS TO OBSERVE FULL-LEVEL FRAGILITY TESTS **

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7 CONDUIT: VALIDATION' PROGRAM CONDUIT' CLAMP-DYNAMICLTESTINGL

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CONDUIT SYSTEMSECONSIST OF CONDUITS, CONDUIT.' SUPPORTS,

' JUNCTION B0XES,oVARIOUS, CONDUIT' SYSTEM HARDWARE, AND

. CONDUIT. CLAMPS..

  • - CONDijlTfCLhMPSL PROVIDE AD SUPPORT: POINT. BETWEEN ' THE CONDUI.T

/AND THE' CONDUIT? SUPPORT-STRUCTURE.

'THEY'ARE' ASSUMED TO'

PROVIDE RESTRAINTtIN' AXIAL, AND.TWO TRANSVERSE DIRECTIONS'.:

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_.l DESIGN' VALIDATION EFFORT HASiTO CONFIRM THAT THE CONDUIT SYSTCM u

IS CAPABLEn0F PERFORMING ITS FUNCTION DURINGlAND-AFTER POSTULATED,

' SEISMIC: EVENTS,

'AS PART OF.THIS CONFIRMATION IT IS NECESSARY

.'TO:SHOW(THAT CALCU' LATED LOADS:ATTHE CONDUIT-SUPPORT INTER-FACE.DUEiTO SEISMIC, EVENT Do.NOT EXCEED THE CLAMP / CAPACITY Li LOALS".1

'IN:.0RDER TO OBTAINLTHE ALLOWABLE CAPACITY LOADS,1 GENERALLY L

EITHER THE~ VENDOR' DATA,;IF'AVAILABLE, IS USED, OR-STATICLTESTS l

.WITH INDIVIDUALLY APPLIED LOADS ARE' PERFORMED.

-THESE LOADS

.s ARE THEN' USED. IN Tr1E INTERACTION FORMULA.

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  • - ThE'SESTATICTESTSWEREPERFORMEDATCCLAND'ARESHOWNON L

.- "THE~NEXT CHART.

THE INDIVIDUAL CAPACITY LOADS FROM:THESE

. TESTS ARE UPPER BOUND. VALUES.

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'IN. N ATTEMPT TO B' TTEii DEFINE THE' EFFECTS' 0F -SIMULTANE0USLY-A E

APPLIED 1THREE DIRECTIONAL-DYNAMIC LOADS ON THE CLAMP: CAPACITY LOADS, A'NEW SET OF TESTS WERE DEVELOPED AND PERFORMED AT CCL, i

THESE TESTS UTILIZED SIMULTANEOUSLY' APPLIED PISTON' DRIVEN CYCLIC LOADS, WITH ALRANGE OF 813 To-2439 COMPLETE CYCLES.

sTHE RESULTS OF'THESE TESTS ARE-VERY CONSERVATIVE AND MAY.BE i

CONSIDERED UNREALISTICALLY-LOW.

THESE LOADS,'HOWEVER, ARE l

ACCEPTED BY THE PROJECT AS THE ALLOWABLE LOADS AND ARE IN-r CLUDED.IN.THE CRITERIA DOCUMENTS.

h SOME CONDUlT SYSTEMS, SPECIFICALLY THOSE WITH THERM 0 LAG OR e

i THERM 0 BLANKET, HAVE-SHOWN CALCULATED CLAMP LOADS IN EXCESS 0F ONE OR MORE ALLOWABLE LOADS, AND THESE CASES ARE PUNCH-LISTED FOR POTENTIAL. MODIFICATION OR_UNTIL MORE REALISTIC CLAMP ALLOWABLES ARE DETERMINED.

ti DURING THE CONDUIT SYSTEM ISOMETRIC VALIDATION l EFFORT, THERE.

IS A NEED TO.SPECIFY A TORSIONAL STIFFNESS VALUE TO CLAMP-E

. CONDUIT !NTERFACE. POINTS FOR SYSTEMS WITH ONE OR MORE BENDS,

=lN ORDER'TO REALISTICALLY REPRESENT THE REAL BEHAVIOR.

TORSION-AL RESISTANCE CHARACTERISTICS OF CLAMPS USED ARE NOT READILY AVAILABLE AND CONSERVATIVE ASSUMPTIONS ARE OFTEN MADE.

j BECAUSE OF THIS NEED-FOR A BETTER DEFINITION OF CLAMP CAPACITIES UNDER SIMULTANEOUS APPLICATION OF SEISMIC LOADS, AND FOR DE-

. TERMINATION TORSIONAL PROPERTIES, IT WAS DECIDED TO PERFORM

' ACTUAL DYNAMIC SHAKE TABLE TESTS AT ANCO FACILITIES.

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DUE TO THE VARIETY.0F CONFIGURATIONS INVOLVED, IT WOULD HAVE l

BEEN VERY DIFFICULT TO COME UP WITH A PRACTICAL NUMBER OF TEST _ SPECIMENS WHICH WOULD BE REPRESENTATIVE SAMPLES FOR THE SEISMIC SHAKE TABLE PROOF TESTING.

THEREFORE, IT WAS DECIDED TO INSTRUMENT TEST SAi4PLES IN SUCH A WAY AS TO OBTAIN REACTION a

l LOADS EXPERIENCED BY THE CLAMPS DURING THE SHAKE TABLE MOTION.

I THE INPUT MOTION WAS SUCH THAT ITS SPECTRA WAS ENVELOPING THE RESPONSE SPECTRA APPLICABLE TO THE COMANCHE PEAK Pl. ANT.

BASICALLY FIVE TEST SET UPSs WITH THREE CONDUIT SPECIMENS EACHs WERE INCLUDED IN THE PROGRAM.

THE MATRIX OF VARIOUS TEST SPECIMENS ARE SHOWN IN THE NEXT SHEET.

1 i

IN ADDITION TO VARIOUS CONDUIT CLAMP BOLT SIZESs THE TEST SPECI-

)

MENS HAVE ALSO INCLUDED OTHER ATTRIBUTES SUCH AS DIFFERENT BOLT MATERIALS BASE MATERIAL BOLT TO BOLT HOLE DIMENSIONAL VARIATION, 0

90 OVERHANG, COUPLINGS AND SO ON.

l THE CONDUIT SPANS USED REPRESENT UPPER BOUND SPANS AS COMPARED TO THE ACTUAL INSTALLED SPANS.

MEASUREMENT OF TORSIONAL RESIST-ANCE CHARACTERISTICS WAS ALSO MADE POSSIBLE BY INSTRUMENTATION 0

AT THE SUPPORT NEAREST TO 90 ELBOW.

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23 Table 4.2 Ultimate Loads for Abrasive Conduit Clamps

'f Filler Clamp stiffestses (Ibs/in.) by Conduit Diameter (in)

Clamp Anchor Plate Bolt -

Type..

Type

' Thickness size 2*

2-1/2"

. 3" -

4" Di rect f on lb6D 4766 4349 Axlal C-7085 Nel s on.-

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.1/2 9776 13451 12717 Transverse

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12041 13199 vertical 3620 4700 4947 Axial

'C.708$

Nelson 1-5/6 sa6a 13172 73654 Transverse verttcai 3910

+ 5376 5272 Asial 9581 Transverse j

C-7085 UNISTRUT 1.

1/2

_12872

{,,[Id72 ve rt ic ai 3328 8644 4744 Axial

'C 708$

UNISTRUT.

1 5/8 18085 19259 161R7 Transverse 3

verticai 3820 4008 5265 Ax1al

{

i C-700$

HILT!

2' 1/2 13742 13681 12150 Transverse 9658 Ve rt ic a l l

Notet 1) L All bolt spacing is standard.

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.i 1 ALLOWABLE CLAMP LOADS U$. LNG. NELSON STUDS

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';CL AMP _. l :

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C 708S

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'! - --*--'- -- +---- '+-- ----- +- -- +---------+------+----

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l (!N)1l

'l80Lil.. LOADS..l80Lil' LOADS ~;10LTj LOADS' l BOLT E LOADS l a......+.........+.....+.........+......+.........+......+.........+......+.........y 1:

lAx!AL' '1 1 Ssv:

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l 560 l l.

9201

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270;;

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1360 l l'

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420 l l

920 l

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l 1100 l.

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<180 l3/8 l 760'; l/2 l

'900 1' 1

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190 l l

' 680 l 1

~ 840 l l

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1 1000 l-l

'1100 L

-l-76? l-l' 960 l 12 lIRANS l3/8 l 680 lI/2 l 1860 ! 5/8 l 1600 l 1/2J.i 980 ;.

1 lVERT l

l 700 l l

760 !

l

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1000 S..4.........+.....i.........+.....+.........+......+.........+......+.........+.

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l AXIAL

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1375 l l

765 t 850-l.

12 1/2 liRANS2 l3/8 l-800l1/2 1 12501.5/8 l 1550 l 1/2' l 940 l l

IVERT l

'l 800ll l

1200 l l

1600 l l-1900:j

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V l:

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j-460 l l

1634 l 770.l.

l.

750l 13' lIRANS-l3/8 !!

800 lI/2.!

1596 l 5/8 l 1506 l 1/2< l 900 l

...L l VERT l

l 800 l' l

3736 l l

50 5 7. - l -'

'2800 l

,......,.........+.....+.........+.....+.........+......+.........+......+.........i l

lAX!AL i

650 l 1640 l 785 L l

700 l l4 lIRANS l3/8'l 775 lI/2 l 1600 l.5/8 l 1400 ; 1/2 !

850-l

-l' l VERT 800 l l

1600 l l

5000 l l

2800 l

+......+.........+.....+.........+.....+.........+......+.........+......+.........+

l-l AXIAL l

l 675 l l

1624 l l

800 l l

650 l l3 lfRANS-l3/8 l 753lI/2 1 1538 ; 5/8 l 1300 ! I/2 l 800 !.

l l VERT l

l 2141 l l

1538 l l

4871 l l

2800 l i

+......+.........+.....,.........+.....+.........+......+.........+......+.........+

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l TABLE 4.2: CONDUIT TEST MAT I"

$y

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l l

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l s l l

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l i

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l l

l No.

l '(i n. ) l Type l (in.) l (in.)

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l ;{

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i l

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l l

lj i

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{

l i

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l I

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l I

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Test Procedure, Document No. A-000189, Pav,e 7 of 13L

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CONDUIT SYSTEM' TESTS FOCUS':

CONDUIT. CLAMP LOADS

- APPROACH:

INDUCE' MAXIMUM ACHIEVABLE-LOADS INTO MID-SPAN CLAMP

'l

. METHODS.:

(1). SSE AND FRA'GILITV -TESTS l

WITH LONG SPAN DESIGNS, MAXIMUM ELBOW OVERHANG (2)

REPEAT WITH-ADDED MASS (CHAINS)- TO -~~ DOUBLE WEIGHT / FOOT, INCREASING SUPPORT LOADS (3)

RELEASING END CLAMP-AXIAL RESTRAINT.TO INDUCE

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DIAMETER L

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TABLE A.1:

AS-BUfLT CONSTRUCT 20N DEVIATTONS (LOCAL DEVIATIONS)

FOR CASE 3 Gaps Between Edge Distance Partial Support Tray and Oversized Unused of Bolt Holes Penetration Number Tray Clamp Bolt Holes Bolt Holes Lessened Welds

$1 No No No No No S2 Yes, typical Yes, 3/4" es, two Ne No 1

3/8" maximum holes for unused bolt gap (see 5/8" $

holes (see Figure A.3).

bolts.

Figure A.4).

53 Yes, typical No No No Yes, 1/8" 3/8" maximum effective weld gap (see throat for Figure A.3).

groove joints (see Figure A.5).

S4 No Yes, 3/4" Yes, two Yes, approx.

No holes for unused bolt 0.06" (see 5/8" 4 holes (see Figures A.1 bolts.

Figure A.4),

and A.2).

SS Yes, typical Yes, 3/4" Yes, two No No 3/8" maximum holes for unused bolt gap (see S/8" $

holes (see Figure A.3).

bolts.

Figure A.4).

1 l

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I 1

M DOCUMENT #

A-000181 PAGED-A-24 I

______________________._______________________.___._j

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