ML20112H106
| ML20112H106 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/28/1985 |
| From: | Horin W BISHOP, COOK, PURCELL & REYNOLDS, TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Mizuno G NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD) |
| References | |
| CON-#285-323 OL, NUDOCS 8504020134 | |
| Download: ML20112H106 (20) | |
Text
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~ ' ~'W Rl.T gR*$ O' R ECT S t A L <2o2> 857-9837 March 28, 1985 Geary Mizuno, Esquire U.S. Nuclear Regulatory Commission 7735 Old Georgetown Road Room 10107 Bethesda, MD 20814 Subj: Texas Utilities Electric Company, et al. (Comanche Peak Steam Electric Station, Units 1& 2); Docket Nos. 50-44 5-) Land 50-446-7)L
Dear Geary:
Enclosed for your records are three copies of a letter from Dr. Iotti and Mr. Finneran to Mr. Burwell transmitting additional material regarding the tests performed in connection with Applicants' motion for summary disposition concerning U-bolts acting as two-way restraints. This information was requested by David Terao. By copy of this letter I am also transmitting three copies of the letter to Mrs. Ellis. Sincerely, N C William A. Horiri Counsel for Applicants Hand Delivery cc: w/ Attachme-F Juanita Ellis (3 copies) w/o Attachm'. Remainder of Service List 8504020134 850328 PDR ADOCK 05000445 G PDR m
r TENAS UTILITIES GENERATING COMPANY P O box 1002 GI EN Ro!E. TEXAS 78043 March 26, 1985 Mr. Spotswood Burwell Licensing Project Manager U. S. Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 COMANCHE PEAK STEAM ELECTRIC STATION INFORMATION ON ITTG TESTS ON U-BOLTS
References:
- 1) Motion for Summary Disposition on U-Bolts Acting As Two-Way Restraints, dated May 24, 1984
- 2) Letter to NRC from Applicants transmitting responses to NRC questions, dated September 23, 1984 - Part B
Dear Mr. Burwell:
Attached please find two attachments which contain information requested by Mr. David Terao. Attachment A consists of original photographs of the tests conducted by ITT-Grinnell in March, April, 1984, the results of which have been reported in ITTG Product Engineering Report No. 562, included as Attach- ^ ment 1 to the Affidavit supporting reference 1. These are the photographs requested by David Terao. Attachment B is the complete supplement to the ITTG Product Engineering Re-port No. 562, which summarizes the tests set-up and results of additional ITT-Grinnell testing on normally loaded U-bolts. These further tests were intended to measure the stiffness of the U-bolts when loaded in their intended direc-tion in the range of the manufacturers' recommended maximum loads. This sup-plement had never been provided to the NRC in its entirety, but the pertinent results had been given to the Staff as part of Applicants' answers in reference 2. Please call if you need additional information. Very truly yours, f L Robert C. IottE cG-ohn C. Finneran. Jr. RCI/JCF/gh cc: W. Horin (for further distributien) A t)t t i m ee > % t at' TT A 4 m t *Til.018 0 m 9.8.9 0 '1 Nit ' t *t * %C l*S % Y
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d = a ff4 cb +k t'et ? STIFFNESS DETERMINATION OF FIGURE 137h U-BOLTS FOR THE COMANCHE PEAK STEAM ELECTRIC STATION TEXAS UTILITIES SERVICES INCORPORATED GLEN ROSE, TEXAS ITT GRINNELL CORPORATION PIPE HANGER DIVISION PIPING / STRUCTURAL ANALYSIS SECTION PROVIDENCE, RHODE ISLAND JUNE 19,1964 SUPPLEMENT TO : i Product Engineering Report No. So2 Prepared By: slo M Nicolas M. Patsalides, P.E. Sr. Analysis Engineer Cneckec By Thomas F. "Irimble, P.E. Staff Engineer Reviewed By: of Frank Vasiliadis, ?.E. Anal sis Sup visor Approved By: /./_, / Peter Staatsn Manager of Product Engineering Pipe Hanger Division, FS6E (
r e e- . TABLE OF CONTENTS Test Objective.........................................., 1 Test Set-Up.............................................., 1 Testing Procedure .......................................,, 1 Stiffness Determination.................................... 1 Test Measurements......................................... 2 Theoretical Stiffness Consicerations....................... 7 4 Table of Results.........................................., 9 'l ~ Photograpns of Test 10 ~. - / .' j I' b l h. 9-m g. N g. 2 ~< F s.
e TE5T OBJECTIVE The objective of the present tests is the evaluation of the stiffness of the ITT Grinnell Fig. 137N or equivalent U-bolts used at the Comanche Peak Station. The stiffness of the U-bolt will be computed in the normal direction only. This is the direction that the U-bolt was designed to resist movement in. TEST SET-UP The R ehle Testing Machine located in the Research, Development and Engineering Department of ITT Grinnell Corporation in Providence, Rhode Island,.will be used in the present tests. The test fixtures required to accommodate the entire testing were designed by ITT Grinnell engineers and built in a faoricating shop. For a detailed presentation of these fixtures see Product Engineering Report No. 562, dated . April 16, 1964, and titled " Testing of Figure 137N U-bolts for tne Comanche Peak Steam Electric Station, T.U.S.I., Glen Rose, Texas." More specifically, i the reader should refer to Appendiy III and to the schematic (Figure 3) on Page 5 of that report. TESTING PROCEDURE Testing consisted of loadir .-bolts in the normal direction and observing the displacement of the U-botcs for different normal loads. Normal loads were readily appliea by and reao on the cial of the Riehle Testing Machine. Vertical displacements were obtained through the use of dial gages placed ' appropriately on the testing fixture. STIFFNESS DETERMINATION U-bolt stiffness is determined through tne relationsnip K = P/x where "P" l represents an amount of normal force unich produces a cisplacement or ( cetlection "x". Units of "P" are usuaily pounas er KIP's ana units of "x'!,are inches. '[] Within the elastic range of a macerial or structure, increments in force ano displacement may be used in the stiffness relationship to give stiffness as, !i (" K= P L3./IN. or KIP /IN. 4x t I 1
e / Y Y L_ _J / / r1 1 I I I U U U U 4' PIPE U 2" P.J D 24' F !?E l' ROD U-80_T J-SOLT Under testing are a 4" pipe 1/2" rod U-bolt and a 24" pipe, 1" rod U-bcit. Th'e schematic diagrams above show the relative location of the dial gages. Normal loads applied are low enough to Keep the stresses in the U-bolts well within their elastic limits. For the 4" pipe 1/2" rod U-bolt the maximu= normal load applied is 10,000 lb and for tne 24" pipe 1" rod U-bolt the maximum normal load appited is 4,000 lo. Four tests were performed on the 4" pipe 1/2" roc U-bolt with one dial gage to measure aisplacements. On the 24" pipe 1" roa U-bolt, two tests were performed with two dial gages to average out the vertical displacements. TEST MEASUREMENTS The following two tables represent, in taoular form, the measurements taken during the testing using Brown & Sharpe dici incicators with 0.001 inct per division, and a full range of 1.0 inch. Inerefore, displacements as les as 5/10CSC tns of an inen (1/"0uu tr.) can te easily read. J 2 t_
4" PIPE 1/2" U-BOLT 3 NORMAL LOAD VS. VERTICAL DISPLACEMENT NORMAL VERTICAL DISPLACEMENTS (IN) LOAD (LB) TEST 1 TEST 2 TEST 3 TEST 4 500. .0070 .0120 .0125 .0125 1000. .0135 .0175 .0170 .0170 1500. .0160 .0200 .0190 .0190 2000. .0175 .0210 .0210 .0210 2500. .0190 .0230 .0225 .0225 3000. .0200 .0240 .0240 .0230 4000. .0220 .0260 .0255 .0250 5000. .0240 .0275 .0275 .0260 6000. .02o0 .0290 .0290 .0270 7000. .0280 .0300 .0300 .0285 8000. .0300 .0315 .0310 .0300 9000. .0320 .0235 .0330 .0320 10000. .0340 .0345 .0340 .0330 a
24" PIPE 1" U-BOLT NORMAL LOAD VS. VERTICAL DISPLACEMENT VERTICAL DISPLACEMENTS (IN) NORMAL TEST 1 TEST 2 LOAD (LB) GAGE 1 GAGE 2 AVERAGE GAGE 1 GAGE 2 AVERAGE 3000. .0110 .0090 .0100 .0120 .0120 .0120 6000. .0200 .0170 .0165 .0220 .0200 .0210 9000. .0290 .0255 .0273 .0290 .0280 .0285 12000. .0310 .0320 .0315 .0330 .0350 .0340 15000. .0370 .0375 .0373 .0370 .0400 .0385 18000. .0400 .0420 .0410 .0420 .0440 .0430 21000. .0430 .0460 .0445 .0450 .0475 .0463 24000. .0460 .0490 .0475 .0480 .0520 .0500 27000. .0490 .0530 .0510 .0510 .0550 .0530 30000. .0520 .0560 .0540 .0540 .0580 .0500 33000. .0560 .0000 .0580 .0580 .0020 .0o00 36000. .0590 .0030 .0010 .0610 .0050 .0o30 39000. .0620 .0660 .0640 .0640 .0680 .0600 42000. .0660 .0690 .0075 .0670 .0710 .0090 A
4" PIPE - 1/2" U-BOLT STIFFNESS K= dP LB./IN. or KIP /IN. Ax where A P = increase in normal force A x = increase in displacement taking A P = 10000 - 4000 = 6000 LB., then the increase in displacement x is, TEST 1 A x =.0340 .0220 =.0120 IN. TEST 2-A x =.0345 .0260 =.0085 IN. TEST 3 A x =.0340 .0255 =.0085 IN. TEST 4 4 x =.0330 .0250 =.0080 IN. Therefore, stiffness "K" is, TEST 1 K = 6000 /.0120 = 5.00 X 105 LB./IN. TEST 2 K = 6000 /.0085 = 7.06 X 105 LB./IN. TEST 3 K = 6000 /.0065 = 7.06 X 105 t3,j;3, TEST ~4 K = 6000 /.0080 = 7.50 X 105 LB./IN. 5 KAVERAGE = b.66 X 10 LB./IN m
e -l 24" PIPE - 1" U-BOLT STIFFNESS K= 4P LB./IN. or KIP /IN. Ax where $LP = increase in normal force A x = increase in displacement taking P = 42000 - 21000 = 21000 LB., then the increase in displacement x is, TEST 1 dL x =.0675 .0445 =.0230 IN. TEST 2 8 x =.0690 .0463 =.0227 IN. Therefore, stiffness "K" is, TEST 1 K = 21000 /.0230 = 9.13 X 105 LB./IN. TEST 2 K = 21000 /.0227 = 9.25 X 105 LB./IN. 5 KAVERAGE = 9.19 X 10 LB./IN r
l TREORETICAL STlFFNESS CONSIDERATIONS I i An approximate value for the U-bolt stiffness can be calculated using the theoretical formula for stif fness of a rod or beam under a tensile load. This formula is, LB./IN. K= AE = L where A = tensile area, IN.2 E = Young's modulus, LB./IN.2 L = length of rod, IN. In the case of the U-bolt, "A" is twice the tensile area of the cross section and "L" can be approximated as half the length of the U-bolt above the plate (see diagram). The theoretical and experimental results for the U-bolt stiffness compare favorably, considering the uncertainties of the theoretical approach, and the numan error factor in the testing procedure. 7
4-12 'd D E = 27,900,000 PSI n Ig r i U LJ d = U-BOLT NOMINAL DIAMETER, IN. D = PIPE OUTSIDE DIAMETER, IN. 11 = D/2, IN. = - II' / 4 ( D + d ), IN. 12 = 1 +1, IN. L' 1 2 A = 2 (IENSILE STRESS AREA), IN.2 U-BOLT d D 11 12 L A K = AE/L 4" PIPE 1/2" U-bolt 0.5 4.5 2.25 3.927 b.177 0.284 12.83 X 105 24" PIPE 1" U-bel: 1.0 24.0 12.0 19.e35 31.e35 1.212 10.o9 X 105 a.
o TABLE OF RESULTS THEORETICAL AND EXPERIMENTAL STIFFNESS VALUES EXPERIMENT THEORY U-BOLT K = d P/d x K = AE/L 4" PIPE 1/2" U-bolt 6.6b X 105 12.83 X 105 24" PIPE 1" U-bolt 9.19 X 105 10.69 x 105
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