ML19326B741
| ML19326B741 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/30/1974 |
| From: | BECHTEL GROUP, INC. |
| To: | |
| Shared Package | |
| ML19326B722 | List: |
| References | |
| CON-6600 NUDOCS 8004170572 | |
| Download: ML19326B741 (22) | |
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ADDENDUM NO. 1 -
, TO REACTOR BUILDING COOL AIR SUPPLY DUCTS TESTING AND EVALUATION
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JOB NO. 6600- c ARKANSAS POWER AND LIGHT COMPANY ARKANSAS NUCLEAR ONE l UNIT I i
APRIL, 1974 PREPARED BY:
BECHTEL POWER CORPORATION P.O. BOX 3965 SAN FRANCISCO, CALIFORNIA 94119
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[ \ 4.0 Duct Test Description U
4.5 Test No. III was conducted on April 4, 1974. The
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test involved the vacuum pressure testing of a 30" x 30" x 10' - 8" long duct specimen with 1" x 1" x 1/8" angle stiffeners at 32 in. spacing. The test was carried out according to the procedure given in Appendix A.
5.0 Duct Test Results 5.3 Test ~No. III ,
C 5.3.1 Dect Specimen: 30" x 30" duct, stiffeners at 32" spacing. The duct was pressurized in 0.25 psi increments to failure. At pressures up to 2.0 psi, some twisting and bowing of the interior stiffeners was observed. At 2.21 psi, one leg of the first interior stiffener began to buckle at midspan. The duct did not collapse, howev'er, and continued to hold pressure until 2.30 psi when the other stiffeners buckled and the duct skin collapsed.
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4 6.0 Conclusions 6.5 The results of the vacuum pressure test on the 30" x 30" duct specimen. representing the Category II l
ducts showed that the failure pressure of the test specimen was 1.92 times greater than the maximum pressure differential applied to the ducts follow-
, ing a loss of coolant accident. Since the seismic
, loading on the ducts is small, a margin of safety j of 1.9 is considered to be reasonable and adequate -l to insure the integrity of the system. l 7.0 Corrective Action e
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p 7.7 The corrective action required for Category II ducts is similar to that outlined in Sections 7.1 through 7.4 and Section 7.6 of this report.
8.O Closecut Action The specific closeout action taken in the modification of all reactor building cool air supply ducts is summarized below. (Refer to Figs. 1 through 11 for stiffener and l
hanger numbers and locations). Dwg. 6600-M-198, sheet 2 was issued to cover all duct modifications.
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8.1 Stiffeners were added at the following locations:
Duct Location of New Stiffener A Between SA6 and HA2
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SA7 SA8
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SA8 SA9 V " "
SA10 " SAll
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SA14 " SA15
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HAS SA16 B " "
SB3 HB4
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HB5 SB6 I
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SB9 SB10
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SBl4 " HB7
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HB7 SB15
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HB1 HB2
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C hcl SC2
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SC2 HC2'
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HC2 SC3
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SC3 HC3 '
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D SD4 SDS
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E HE3 SE8
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SE13 " HE5
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} HE5 SE14
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SE15 32" Round Duct
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F SF2 SF3
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SF3 HF2 i
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O Duct Location of New Stiffener F Between HF3 and 32" Round Duct (2)
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HH1 HH2 8.2 Angles were added to the following stiffeners and hangers in order to provide stiffening around the entire circumference of the duct:
Duct Hanger / Stiffener No.
A HA3, HA4, HAS, HA6 B HB2, SB3, HB5, HB6 SB10, HB7, HB8 D SDl, HD3 E HE3, HE4, HES F HF2, HF3 H HH2, HH5 8.3 Welding between stiffener and duct or hanger and duct was added at the following locations:
Duct Hanger / Stiffener No.
A sal, SA2, SA3, SA4, SAS SA6, SA8, sal 2, SA14, SA15 SA17, SA18, SA19, SA20, SA21, SA22, SA23, SA24, SA25, HAl, HA7 B SB1, SB2, SB3, SB4, SB5, SB6, SB7, SB8, SB9, SB10, SBll, SB12, SB13, SB14, SB15, SB16, SB17, SB18, SB19, SB20, '
SB21, HB1, HB2, HB3, HB4,
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HBS, HB6, HB8 l
C SC2, SC3 D SDl, SD3, SD4, SD7 E SE7, SE8, SE9, Sell, SE12 i SE13 F SF2, SF3, SF4, SF5
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REVISED FIGURES AND TABLES 4
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D O O O TABLE I -
DUCT DESIGN REQUIREMENTS AND TEST RESULTS Maximum Dif ferential Pressyre Factor of Sa(ety ==
Stiffener Stiffener (P.S.I.) Test Pressure Category Duct Size A_J1e Size Spacing Design (LOCA) Test Design Pressure 1 (in.Xin.)
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I 17X12 1XIX1/8 48" 1.0 20X12 1XIX1/8 48" 1.0 20X16 1XlX1/8 48" 1.0 5.42 5.4 II 30X23 1XIX1/8 32" 1.1 2.30{$
j 1.9 jfi 30X30 1XIX1/8 32" 1.2 30X20 ! 32" 1.0 III 35X30 lff2X1f!2X1/8 1 4X1 ! 4X1/8 32" 1.2 2.82 2.3 IV 52X16 2X2X1/4 24" 1.3 -
60X32 2X2X1/4 24" 1.2 60X35 2X2X1/4 24" 1.3 60X40 2X2X1/4 24" 1.2 2.86 2.4*
V 12" Dia. Stiffeners at hanger 1.0 14" Dia. locations only. Maximum 1.0 16" Dia. hanger spacing 12'-0" 1.0 20" Dia. 1.1 32" Dia. 1.3 4.53 3.5
- Duct not tested to failure /i Revised 4/12/74
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/b INEvi5EO 4- Il TOR BUILDING pygggg i SUPPLY DUCTING bTS D AND E
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APPENDIX A 4
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REPORT ON DUCT TEST NO.1 ,
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P R O C 5'.D U R E :
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A ten (10) foot section of duct with four i.n t e rmedia t e
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2x2 inch angle supports was the subject of this test.
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The duct specimen had steel sections welded across each '
. end to create an air tight box. This " box" was placed in a vertical. position, long dimension vertical, and connected to a. vacuum pump at the lower end and a di f ferentla1 mercury
.monometer near the top. By creating a partial vacuum internally, the duct section was sul.jected to st resses c
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created by atmospheric pressure. The difference between
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internal and external pressures was measured on a differential mercury monome'ter. The monometer accuracy was within one ,
millimeter corresponding to a pressure of O'.019 psi.
/ \ RESULTS:
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MONOMETER PRESSURE .
LONG SIDE SHORT SIDE READING e GAGE 81 GAGE #2 (CM) (JPSI)
- 0.019) (INCllES ) (INCilES )
30.2,30.2 = 0.0 0.0 0.000 0.900 30.5,29.9 = 0.6 0.116 0.611 0.870 31.0,.29.4 = 1.6 0.309 0.500 0.820 32.1,28.3 = 3.8 0.735 0.450 : 0.738 33.0,-27.4 = 5.6 1.083 0.407 0.683 33.9,26.5 = 7.4 1.431 0.110 0.540 35.0,25.4 = 9.6 1.857 0.212 0.497 37.6,22.8 =14.8 2.862' *
- 33.9,26.5 = 7.4 1.431
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- Readings not recortled for na fety reannnt: . Obnerver was too close to duct and f ailure might result in injury.
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- Gage mount had moved; reading inaccurate. .
CONCLUSIONS:
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- 1. The subject duct did not fail or collapse in any way. ~
- 2. There was noticeabic diaphram type deflection of the
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REPORT ON DUCT TEST NO. 3 .
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I REPORT OF PHYSICAL '
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TESTS OF STEEL AIR DUCT i e
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FOR: The Genern . 4.ir Conditioning Company l-
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8107 Interstate 30 -
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Little Rock, Arkansas 72209 .
Attn: iIr. Jim Wellons , P.E. '
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COPIES TO: 2-Above
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h-Bechtel Power Corporation P.O. Box 459 c Russellville, Arkansas 72301 <
f Attn: Mr. Larry Tilley ,
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PURPOSE: The purpose of this test is to observe the behavior of a typical 30" x 30" x 10' - 8" ;
section of the reactor building cool air i supply ducting under vacuum pressure, and to determine fro = this behavior whether or
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not further modifications to the exist.ing 30" 7. 30" cool air supply diiets in the g i
reactor building are required. ,
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(J PROCEDURE:
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A ten foot eight inch section of duct with four intermediate 1 x 1 x 1/8 inch angle supports was the subject of this test. The I
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duct specimen had steel sections velded ac.ross each end to create an I i
- air'ti ht6 box. This ' box" was placed in a horizontal position, lon6 dimensiod horizontal, and connected to a vacuum pump at one end and a differential merc- mono =eter at the other. By cree. tin 6 a partie.1
' vacuum internally,*the duct section was subjected to stresses created
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by atmospheric pressure. The difference between internal and external i
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1 pressures was measured on a differential mercury conometer.
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monometer accuracy'as v within one millimeter corresponding:to a l
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pressure of 0.019 psi. The specimen was leak tested prior to testing. ';
RESULTS:
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FRESSUTC l PSI .
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I (I0.019) OCCURfaCE ,
0.00 1
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Hone O.25 None I 0 50 -
" Popping" sounds as sh".n concaved in. i
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1" x 1" an61e outer le;; cr.nt about 10 .
,1.25' Increased cant , some invcrd deflectica.
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, 1 75 Same, very notable deflection. !
2.00 Same 2.21 First failure of first interior stiffener, f; no local buckling.
2.30 {
s Final failure , complete buckling of 1" x 1" P <
angle. .
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CO."CLUSIO:;3 : ,
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- 1. The subject duct- failed at a pressure of 2.21 pri with najor .
p deflections on two sides cf the duct. 'i"ne finn 2
\ t failureindicatedf
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- by. local bucklint'. of the 1" x 1" an:Fles was rac . rdc'd at 2. 30 psi.
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(w-) 2. The mode of failure was similar to rectangula ducts tested and
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. reported under our report LR-79773, dated Februcry 27, 1974. I
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- 3. No velds failed. .
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TEST PROCEDURE l
for the !
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VACUUM PRESSURE TESTING l
of a ;
i 30" x 30" DUCT TEST SPECIMEN i i
of the REACTOR BUILDING COOL AIR SUPPLY DUCTING for the ARKANSAS NUCLEAR ONE - UNIT I for l
, ARKANSAS POWER AND LIGHT COMPANY
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Consisting of:
I Test Procedure - 3 pages Figures 1 and 2
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i x_s/ I. Purpose of Test -
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The purpose of this test is to observe the behavior of a typical 30" x 30" x 10' - 8" section of the reactor building' cool air supply ducting under vacuum pressure, and to determine from this behavior whether or not further modifications to the existing 30" x 30" cool air supply ducts in the reactor building are required.
c II. Test Description The test shall consist of applying increments of vacuum pressure to the test specimen which is shown in Figurrs 1 and 2. The pressure shall be increased in increments of 0.25 psi until the specimen fails
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The test specimen consists of a 10' - 8" long straight section of 30" x 30" ducting with 1" x 1" x 1/8" angle stiffeners around the circumference of the duct at 32" spacing.
III. Test Preparation
. l The test specimen shall be in the horizontal position I resting on support blocks located as shown in Figure 1.
- The test specimen shall be leak tested before testing.
An internal pressure of no greater than 1/2 psi shall be used during leak testing.
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Vacuum pressure in the test specimen shall be measured using a mercury U tube manometer.
IV. Data Acquisition The test specimen shall be pressurized in 1/4 psi in-crements until duct collapse is attained. At each in-crement of pressure, a visual examination of the test specimen shall be made and any evidence of stress con- c centration or other unusual behavior shall be recorded.
V. Test Report A test report shall be prepared showing all pertinent
data and test results.
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