ML20093H811
| ML20093H811 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 07/27/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-84-508-000 30356, 83-11-#4, OL, OM, PT21-84-508, PT21-84-508-000, NUDOCS 8410160391 | |
| Download: ML20093H811 (21) | |
Text
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3 4 Consumers Power James W Coon O h Vice President - Pmjects, Engineering and Construction General offices: 1945 West Pernali Road, Jackson, MI 49201 e (517) 788-0453
. July 27, 1984 83-11 #4 Mr. J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 POTENTIAL DEFECTS IN MECHANICAL SHOCK ARRESTORS FILE: 0.4.9.83 SERIAL: 30356
Reference:
J W Cook letters to J G Keppler, same subject:
- 1) Serial 26651, dated January 6, 1984
- 2) Serial 28041, dated March 16, 1984
- 3) Serial 30268, dated May 4, 1984 The referenced letters were interim 10CFR50.55(e) reports concerning defective capstan springs in Pacific Scientific uechanical shock arrestors.
This is a final report.
Because further investigation could not eliminate the possibility of eventual capstan spring failure in Midland equipment and because those failures could have prevented some mechanical shock arrestors from performing their intended safety functions, this condition is considered reportable under the requirements of 10CFR50.55(e). Attachment 1 describes the investigation of the concern and the correction actions that have been completed or planned.
JWC/AHB/cd
Attachment:
- 1) MCAR 75, Final Report, dated July 2,1984 CC: Document Control Desk, NRC Midland NRC Resident Office Washington, DC Midland Nuclear Plant DSHood, USNRC Office of NRR .INPO Records Center 8410160391 840727 PDR ADOCK 05000329 $@
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- 83-11 #4
' Serial 30356' OM/0L' SERVICE LIST Mr Frank'J Kelley ' Atomic Safety & Licensing Attorney General of the Appeal Board
, State of Michigan U S Nuclear Regulatory Commission Ms Carole Steinberg, Washington. DC 20555 Assistant' Attorney General Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI'48913- U S' Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr-Myron M Cherry, Esq Suite 3700 .
Ms Mary Sinclair Three First National Plaza 5711 Summerset Street-Chicago, IL 60602 -Midland, MI 48640 Mr Wendell H Marshall Mr William D Pa' ton,' Esq-RFD 10 Counsel for the NRC Staff Midland, MI 48640 U S Nuclear Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety-& Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission- U_S Nuclear Regulatory Commission East-West Towers, Room E-413 Washington, DC 20555 Bethesda, MD 20014 Ms Barbara Stamaris Dr Frederick P Cowan 5795 North River Road 6152 N Verde Trail Rt 3 Apt B-125 Freeland, MI 48623 Boca Raton, FL 33433 Dr Jerry Harbour Mr Fred C Williams Atomic Safety & Licensing Isham, Lincoln & Beale Bcard Panel 1120 Connecticut Ave, NW, Suite 840 U S Nuclear Regulatory Commission Washington, DC 20036 East-West Towers, Room E-454 '
Bethesda, MD 20014 Mr James E Brunner, Esq Consumers Power Company Mr M I-Miller, Esq
.212 West Michigan Avenue Isham, Lincoln & Beale
- Jackson, MI 49201 Three First National Plaza 52nd Floor Chicago, IL 60602 OC0784-0018A-MP01
. 3 83-11 #4 Serial 30356
-Mr D F Judd Babcock & Wilcox PO Box 1260 Mr John Demeester, Esq Lynchburg, VA 24505 Dow Chemical Building Michigan Division Mr Steve Gadler, Esq Midland MI 48640'-
2120 Carter Avenue St Paul, MN 55108 :Ms Lynne Bernabei Government Accountability Project Mr P Robert Brown 1901 Q Street,101
. Clark,'Klein & Beaumont. Washington, DC 20009 1600 First Federal Bldg
' Woodward-Ave Detroit, MI 48226 3/14/84 l
l OC0784-0018A-MP01 I
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-httachment 1-
-._,_ Serial.30356_. .. .
Bechtel Power Corporation
.I54982 . _
777 East Eisenhower Parkway Ann Arbor, Michigan asesAmeess: P.O. Box 1000, Ann Arbor, Michigan 48106
, ,_ July 2, 1984 BLC-20070 3+,7 Consumers Power Company -
1945 Parnall Road Jackson, Michigan 49201 Attention: Mr. J.W. Cook Vice President Projects, Engineering and Construction
Subject:
Midland Plant Units 1 and 2 Consumers Power Company Bechtel Job 7220 MCAR 75 - FINAL REPORT The Final Report for MCAR 75, concerning defective capstan springs in Pacific Scientific Company shock arrestors supplied to the Midland plant, is attached for your information and use.
Very truly yours, 7
John Rutgers I Proj ct Manager J R dkj -
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Attachment:
MCAR 75 - Pinal Report I '" ~'
CC: g . Bird JULC T J.T. Christy 3 " cak G.R. Eagle IM!TY kistaark R.J. Erhardt L. Gibson J.P. Knight D.T. Perry D.L.,Quanne B.W. Marguglio c R.A. Wells (all w/a)
Written Response Requested: No
i54980 Bechtel Associates Professional Corporation
SUBJECT:
MCAR 75 Potential Defects in Mechanical Shock Arrestor Models PSA-1 and PSA-3 FINAL REPORT
'DATE: July 2, 1984 PROJECT: Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Introduction This report addresses potentially defective capstan springs in Pacific
, Scientific Company (PSA) shock arrestors supplied to the Midland project. This has been identified as a 10 CFR 21 condition by Pacific Scientific.
Description of Concern Attachment 1 identifies certain Pacific Scientific Company mechanical shock arrestor Models PSA-1 and PSA-3 furnished to the Midland project by ITT Grinnell Corporation that may have cracked capstan springs. The suspect capstan springs were supplied to Pacific Scientific by one of two spring manufacturers. ITT Grinnell previously identified 283 shock arrestors furnished to Midland that contain suspect springc.
Subsequently, this number was reduced to 222 because of further investigation (reference: Attachment 2).
Susunary of Investination and Historical Background Pacific Scientific Company has investigated the subject deficiency and concluded that springs with possible cracks are limited to those supplied by one spring manufacturer. ITT Grinnell has identified those snubbers furnished to the Midland project that contain the suspect springs.
l Subsequently, PSA and ITT Crinnell have recorunended that additional inspection / testing of suspect snubbers be performed. This is further addressed unde.e the Corrective Action section of this report.
Analysis of Safety Implication ,
The possibility exists that cracks in the capstan springs could result in spring failure during dynamic loading, thereby potentially affecting the ability of the component to perform its intended safety function.
l 0503u L -
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Bechtal Associates Professional Corporation 154980 i MCAn n 154982 Final Report
-Page 2 Root Cause As discussed in Attachment 3, the root cause of this problem has been l traced to one of Pacific's subsuppliers and the manufacturing process the subsupplier used. The suspect process was as fo11cws:
.a. Cold draw round bar into rectangular form
- b. Age harden the rectangular wire
- c. Coil wire into a spring shape i d. Stress relieve
- f. Silver plate l
A metallurgical evaluation concluded that the microcracks were caused by formation of spring tang after age hardening at 900F followed by silver plating.
Corrective Action
! 1. Field engineering has identified suspect piping shock arrestors on l
Nonconformance Report (NCR) C-00949 issued December 13, 1983. ITT Grinnell was the sole supplier for Midland of snubbers (for piping) containing suspect capstan springs. A review was performed to determine that no other disciplines / areas on the Midland project have similar concerns. It was detenmined from this review that no other siellar concerns exist.
- 2. All suspect shock arrestor capstan springs will be inspected fer cracks; all defective capstan springs will be replaced. This activity will be completed before fuel load, and will be tracked via NCR C-00949.
- 3. Corrective actions taken by Pacific to preclude recurrence were to revise the manufacturing process and add further inspection requirements. The process now followed is:
- a. Cold draw round bar into rectangular form
- b. Normalize the material 4
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Bechtal Associates Professional Corporation 154980 ncAm 75 154982 Final Report Page 3
- c. Coil wira into a spring shape
- d. Age harden
- e. Stress relieve
- g. Silver plate
- h. Nondestructive examination Reportability Based on the safety implications, this deficiency was reported to the NRC as potentially reportable in accordance with Title 10 of the Code of Federal Regulations, Part 50.55(e) on December 7, 1983.
Submitted :
j, E.B. Poser Project Engineering Manager Approved by- *
- B.R. Klein Plant Design hief Engineer r-Approved by: _. /N -
EN-
.H. Smit'h Engineering Manager f
Concurrence by: n /w
[ 8fA. Dietrich Project Quality Assurance Engineer RFT/MS/rar*(PD)
Attachments: 1. ITT Grinnell letter to Bechtel, 10/5/83 (Com 131017)
- 2. ITT Grinnell letter to Bechtel, 4/10/84 (Com 147609)
- 3. ITT Grinnell letter to Bechtel, 3/6/84 (com 144941) 0503u o
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en.anor " / \
,t f"KinTech Divisi:n 54982 -
P B CIFIC
~ '
l SCIENTIFIC 143930 154980131017 -
21 September' 1983 . .- i i N -
N'. b.MN D. 5 swart 4, B wet LY l ZTT Grinnell -
621 D'ana Street N.E'. '
Warren, Ohio 44481 Attention: Mr. T. Lauka l
Subject:
Pacific Scientific Mechanical Shock Arre:stors
,, Model PSA-1 and PSA-3 o,
Reference:
Service Report No. SR83-01 Gentlemen: ,
i The attached report discusses potential problems with certain a serial number PSA-1 and PSA-3 snubbers. Our records indicate that the units shown on Attachment A are in the affected group and were delivered to you.
O At your convenience, please return these snubbers to us for o inspection and repair as necessary. If the snubbers are still O
in warranty (one year warranty if shipped prior to 1 April 1983 i and five year warranty if shipped on or after 1 April 1983),
this will be done at no charge to you--excluding freight. Should the units be beyond the warranty period, there will be a $100.00 per unit charge, also excluding freight.
All affected~ snubbers will be returned to you within 30 days aftep we receive them.
The foregoing will apply to snubbers returned to us through 31 December 1984.
We apologize for any inconvenience this may cause you.
'Very ruly yours, P. A. Hadnagy Director Technical Operations )
i PAH:sf Enclosure ##
1348 S. State College Boulevard, Anaheim, Cai!fornia 92803 (714) 774 5217. TELEX 65 5490
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154982 C L -
k54980 SCIENTIFIC.
131017 143930 Su sa-ol SHOCK ARRESTOR' CAPSTAN SPRING SERVICE REPORT During testing of Pacific Scientific Company's PSA-1 Shock Arrestors, part number 1801102-05, at Union Electric Callaway i Station by Daniel International personnel, 4 of 7 snubbers tested revealed a broken capstan spring tang.
Pa'cific Scientific Company requested failed springs for indepen-dont metallurgic,al examination. Failed components were returned to Pacific Scientific Company who forwarded broken springs to "Mattek", 1805 E. Carnegie, Santa Ana, CA 92705, (714) 549-1083, for metallurgical and fracture analysis.
h, One spring exhibiting a visual crack in one tang (removed from l
. snubber S/N 21524 which was returned by Union Electric) was in-O stalled by Pacific Scientific Co. into a snubber and subjected
, to a full load (1500 lbs.) acceleration test. This test was
_ repeated 5 times (10 full load cycles) with no_ failures. The -
cracked spring was then subjected to a dynamic load cycling PO test. This test cycles the snubber at 3 Hertz s.ntervals from I 3 to 33 Hertz for 10 seconds at each interval at 1004, 75% and 50% rated loads, a total of 5940 cycles. ,The cracked spring i satisfactorily passed this test.
o Springs from the identical lot as those that failed were traced O to snubbers located at Kansas Gas & Electric Co. Wolf Creek Station. These were returned to Pacific Scientific for testing
, e and evaluation. ~
4 Eleven (11) each 1801102-05 PSA-1 Shock Arrestors returned to Pacific Scientific Co. by Kansas Gas & Electric Co. Wolf Creek l Station were visually and functionally tested by Pacific Scien-l tific Co. personnel in the presence of KG&E and Union Electric Co. personnel.
All eleven PSA-1 Shock Arrestors (S/Ns 21511 thru 21521) were disassembled to a level permitting verification that the capstan spring was properly' installed and whole. The Shock Arrestors were reassembled and subjected to a successful acceleration test at full rated load (1500 lbs.).
Following successful acceleration test, all eleven Shock Arres-tors were disassembled to facilitate visual and non-destructive examination of the capstan springs:
S/N 21511 - No apparent visual defects. Magnetic particle non-l .
destructive examination revealed indications in both spring tangs with one tang exhibiting three separate
, indications. Indications were suspected to be micro cracks.
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l ,/ 1346 8. State College Boulevard, Anaheim, California 92803. (714) 774-5217, TELEX 65 5421
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143930
- - 15spSO
' SNOCK ARRESTOR CAPSTAN SPRING SERVICE REPORT --(Cont'd.) '
131017 ' .154982 S/N 21512 - No apparent visual defects. Magnetic particle'examina-l tion exhibited an indication of one micro crack on '
omai tang. ,
- S/N 21513 - No apparent visual defects. *No magnetic particle 4
' awamination indications.
S/N 21514 - No apparent visual defects. No magnetic particle examination indications.
S/N 21515 - No apparent visual defects. Both tangs exhibited e
. a magnetic particle micro crack indication.
S/N 21516 - No apparent visual defects. No magnetic particle examination indications.
! S/W 21517 - No apparent visual defects. No magnetic particle
! go . , examination indications.
n S/N 21518 - No apparent visual defects. Both tangs exhibited a magnetic particle micro crack indication.
y* S/N 21519 - No apparent visual defects. Both tangs exhibited l a magnetic particle micro crack indication. ,
!C S/N 21520 - No apparent visual defects. One tang exhibited a magnetic particle micro crack indication. .
O S/N 21521 - No apparent visual defects. One tang exhibited a o magnetic particle micro crack indication.
O Five (5) capstan springs exhibiting nen-destructive magnetic particle examination indications were assembled into a test snubber and subjected to a dynamic load of 1500 lbs. at fra-quencies of 3 to 33 Hertz intervals for 10 seconds each at 100%,
754 and 50% of rated load.
The springs tested represented the " worst case" as determined by the non-destructive magnetic particle inspection. They were i S/Ns 21511, 21515, 21518, 21519 and 21520.
Springs, S/Ns 21515 and 21518, survived the entire test (5940 cycles). Spring, S/N 21511, survived.533 full load cycles beforait both tangs failed. S/N 21518 survived 1800 full load cycles before one tang failed, and S/N 21520 survived 1850 full load cycles before one tang failed.
Metallurgical report by Mettek Material Engineering Technology Laboratories indicates spring cracking occurred because of stresses induced during spring forming which caused hydrogen cracking during subsequent silver plating.
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143930 Prg3 3 f54982 d 5 Q)cQ 3,,,,ppy pfp,, ,, MING SERVICE REPORT - (Cont'd.)
a urgical report also explains that, although the spring fracture face exhibited brittleness at the crack onset, the core of the spring was ductile and spring fracture was simple dimple (ductile) rupture. This accounts for the ability of the l springs to withstand the full load functional and dynamic load
~
l , testing conducted and suggests that the useful life of springs
- a which contain cracks r==mina to be substantial. .
l The capstan springs are manufactured for Pacific Scientific Co. !
l by a spring manufacturer. These springs are supplied formed, stress relieved and 1004 magnet!c particle inspected to Pacific- j
- Scientific Co. , who then subcontracts the springs for silver , ;
plating. Pacific Scientific Co. part numbers for the capstan -
springs are as follows: ,
i PSA-1 (1801613)
PSA-3 (1801614) e- Pacific Scientific is effecting corrective action with the spring manufacturer, the nature of which is not yet fully established.
O.
Escommendations n At your earliest convenience, return the affected snubbers to Pacific Scientific for inspection.
Inspection will include removal of spring to facilitate examina-tion for tang cracks by use of magnetic particle or liquid ,
o penetrant non-destructive examination.
O '
Urgency of inspection is to be assessied by individual owners based on snubber system application and analysis of results of O tests conducted on failed snubbers and reported herein.
- Affected Serial Numbers PSA-1 Pacific Scientific Part No. 1801102-05
- 8/Ns 15672 n rsu thru 16921
.. , o u, z.
18211 thru 21160 l 21411 thru 22060 22311 thru 22710 Illit ** Ith.D i s l PSA-3 Pacific Scientific Part No. 1801106-05 S/Ns 21311 thru 21610 gesar r m zoSGS 24311 thru 25310 ** 810 " zocgsr 25361 thru 25960
, 27194 thru 28543 #*
tosos. ,, 2.o 39f 2.o ff s
,, 2o634 s.e 4 eo 41 6 ** 'Il ta231 ..
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ATTAL.;5Mr.NT A
- 154980 131017 Model Number PSA-1 1)
Part Number 1801102-05 and -07
' serial Numbers 154982 143S3'O au ss s tsu suuut . .
t 16667 thru 16733 16754 thru 16920 '
i 18346 thru 18445 '
i 18709 thru 18724 19725 thru 18735 ~
l 18736 thru 18765 18766 thru 18908 -
j 19482 thru 19551 19552 thru 19576 ,
19982 thru 20081 20418 thru 20547 20691 thru 20736 -
20961 thru 21060 21061 thru 21084 22443 thru 22542 O -
22711 thru 22860 .
to C'
- 2) Model Number PSA-3 ~
O Part Number 1801106-05 and -07 O
Serial Numbers 28144 thru 28232 20637 27623 thru 27693 20700 27906 thru 27937 '20851 thru 20869 27696 thru 27738 20870 thru 20955 27739 thru 27905 25826 thru 25916 25444 thru 25498 25532 thru 25642 25646 thru 25759 25036 .
25393 thru 25443 24711 thru 24910 21565 thru 21610 506 thru 510 (-07) ,
486 thru 487 (-07) ,
24311 thru 24410 21461 thru'21495 20302 thru 20395 20551 thru 20636 .
20398 thru 20400 9P
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- emwcri HD .81zr e1 29.. .,4 MD-A21 MIDLND 2-417-5-123 143930
!S442 MD-A21 MIDLND 1-483-3-505 20074 MD-A21 MIDLND 1-414-4-524 21842 MD-A21 HIDLND 1-414-4-52d 20076 IS-A21 MIDLND 2-417-5-122 20907 MD-A21 MIDLND 1-414-4-527 20072 MD-A21 MIDLND 1-414-4-539 19549 MD-A21 MIDLND 1-414-2-589 21984 MD-A21 MIDLND 1-614-2-599 21884 MD-A21 MIDLND 1-616-3-500 21871 MD-A21 MIDLND 1-416-3-508 .
21843 MD-421 MIDLND 1-691-2-512 20530 MD-A21 MIDLND 1-416-3-501 20079 MD-A21 MIDLND 1-416-3-509 28034 MD-A21 MIDLND 1-616-3-509 21874 MD-A21 MIDLND 1-616-2-533 20993 MD-A21 MIDLND 1-414-3-525
!L129 MD-A21 MIDLND 1-616-4-542 20519 MD-A21 MIDLND 1-416-4-530 29520 MD-A21 MIDLND 1-616-4-530 20996 MD-A21 MIDLND 1-416-4-529
!T970 MD-A21 MIDLND 1-616-4-529 2M92 MD-A21 MIDLND 1-616-4-530 2'1997 MD-A21 MIDLND 1-616-3-503 2tr '2 MD-A21 MIDLND 1-616-3-507 26 3 MD-A21 MIDLND 1-614-4-523 20991 MD-A21 MIDLND 1-616-4-536
!)(73 MD-A21 MIDLND 1-616-4-537 28483 MD-A21 MIDLND 1-616-4-541
?@g39 MD-A21 MIDLND 1-616-4-541
!F990 MD-A21 MIDLND 1-616-2-582 12800 MD-A21 MIDLND 1-616-2-502 1C863 MD-A55 MIDLND 2-617-5-131 18842 MD-A55 MIDLND 1-616-2-534 18726 MD-A90 MIDLND 1-652-1-522 18789 MD-A90 MIDLND 1-652-1-523 20046 MD-A46 MIDLND 1-E88-2-3-H4 18785 MD-A90 MIDLND 2-652-1-519 1C824 MD-A90 MIDLND 2-652-2-520 18730 MD-A90 MIDLND 2-652-1-521 18721 MD-A56 MIDLND 1-638-14-501 18729 MD-A56 MIDLND 1-638-14-501 18711 MD-A56 MIDLND 1-638-14-503
_19720 MD-A89 MIDLND 1-603-1-500 18712 MD-A89 MIDLND 2-639-14-500 (6732 MD-A89 MIDLND 1-603-2-38 8731 MD-A89 MIDLND 1-616-2-535 8716 MD-A89 MIDLND 2-652-1-504 8724 MD-A89 MIDLND 2-652-1-505 815 MD-A89 MIDLND 2-652-1-506 E 3 MD-A89 MIDLND 2-652-1-507 8719 MD-A89 MIDLND 2-652-1-509 9722 3713 MD-A89 MD-A89 MIDLND MIDLND 1-652-1-510 1-652-1-511 m gL * [ ,
3727 MD-A89 MIDLND 1-652-1-512 i L Ch b
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~10725 MD-AS9 MIDLPG 1-452-1-513 18733 MD-489 p!00@ 1-452-1-514 1C728 MD-AS9 MIDLND 1-452-1-515 14425 MD-935 MIDLND BULK i 14558 MD-935 '" "
14843 MD-935
- l 16782 MD-935 "
i 14447 MD-935 "
<19407 MD-957 MIDLND NONE L!STED )
- 19519 MD-994 MIDLND =
19532 MD-99,4 * ~
19512 MD-994 "
195G8 MD-994
- 19047 MD-994 "
19550 MD-996
- I 19088 MD-994 "
19538 MD-994 * * '
,1g3S MD-996 *
!!9495 MD-996 "
l19496 MD-996 "
19499 MD-994 "
17159 7 MD-994 "
78 MD-996
- 1g4. 73 MD-994 "
,4 0 MD-994 "
l14s32 MD-996 "
'14547 MD-994 "
1M42 MD-996 "
1'M99 MD-996 "
1 @ 49 MD-996
- 14548 MD-996 "
15588 MD-996 "
16542 MD-881 MIDLND 2-619-6-109 1d441 MD-881 NIDLND 2-619-d-109 1C369 MD-797 MIDLND NDT LISTED 18371 MD-979 * "
- 18379 MD-979 " "
l18001 MD-979 MIDLND SULK
'18:04 MD-979 * *
- 22047 MD-D02 MIDLND NOT LISTED
- 22049 MD-De2 MIDLND "
l22 51 MD-D02 " *
- 22052 MD-De2 * *
!22455 MD-D02 * "
22454 MD-C02 MIDLND SULK
- 22458 MD-C02 MIDLND "
.22C40 MD-D82 * *
?20d1 MD-C02 * *
!2042 MD-C02 * *
!2 i MD-C02 MIDLND SULK
- 2*od MD-D02 * *
'2048 MD-D02 *
- 2449 MD-C02 " "
2470 MD-C02 * * *{
2472 MD-Ce2 " "
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- j. #s4380 I31017 154982fri,d /aud Comver. MD Stre Si enSr s
- 2. /s MD-C02 *
- l22074 HD-002 "
l l22074 MD-C02 i
- l l22078 MD-C02 *
- l l22479 MD-C02 * *
.- 1 22000 MD-DS2 *
- I 22 81 MD-C02 * "
22CS2 MD-C02 *
- 22003 MD-D02 *
- 22004 MD-D02 *
- l 22084 MD-C02 MIDLND SULK -
l 22090 MD-C02 *
- 22091 MD-C02 " "
22095 MD-C02 *
- 22094 MD-D02 * *
- 22505 MD-002 * "
22504 HD-C02 * * '
'29522 MD-838 MIDLND 2-617-5-43 22534 MD-DD2
- suLM '
l22717 MD-Del *
- i2[720 MD-D02 *
- l22722 MD-Det * "
l3RF23 MD-D02 * "
I22739 MD-Del " "
!3P"S1 MD-Del *
- L 21 .2 MD-D01 * "
!22745 MD-D01 *
- 2M47 MD-Del "
- 122749 MD-Del " "
'2tF52 MD-Del * "
l22753 MP-Del " "
i2EYd3 HD-D01 * "
l22771 MD-Del " "
,22774 MD-Del * "
22781 MD-D02 *
- 22783 MD-D02 " "
22786 MD-D01 *
- 22789 MD-D02 * -
22790 MD-D02 " "
22791 MD-D02 *
- 22792 MD-D02 * "
l22793 MD-D02 " "
l22794 MD-DB2 " "
22795 MD-002 * *
,22796 MD-DB2 "
- l22800 MD-DC1 "
l?2001 MD-D01 "
'?2802 MD-D02 " " -
?2803 MD-D02 * *
'!2305 MD-Del " "
' '1 6 MD-Det *
- 2 07 MD-Det * "
2808 2810 MD-D01 MD-Del
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2811 MD-D02 *
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CENT 1mCTs 79 t31017 SIZE S1 PASE 4 2k.13 MD-Del *
- 143930 22815 MD-DG2 * ~"
22814 MD-Det *
- 22817 MD-De1 *
- 22818 'MD-081 * * .<
22819 MD-D02 *
- 22828 MD-DG2 *
- 22821 MD-041 *
- 22822 MD-D91 " " '
22823 MD-002 " "
j 22820 MD-Del " " -
22825 MD-D01 *
- 22827 MO-Det *
- 22828 MD-Del " "
22829 MD-Det *
- 22831 MD-D01 *
- 22033 MD-D81 "
- Q 30 MD-Del " "
22835 MD-D82 *
- i 22838 MD-D01 " "
22839 MD-D01 * "
l28858 l
MD-Del " "
l Q851 MD-001 *
- za54 MD-Det * *
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24318 E-MD-A21-00 2-632-2-23 3 l E 24322 E -MD-A 21-0 0 1-610-1-504 3 C3 .
M.) ..'"y v.g. 77 y Eg :r D .=. F 1-616-2-5 0 5 : .r.. ,.' TF ~ 3 9 ^ ~ C "f, ; '9 :f.- i '
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. . .. . .....q Bechtel Job 7220 ' '
i 7.0. No. 722 6 .I PSA Capetse Spring'Probles i
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l' There are ao additions to previous listia8s of PSA Meenasiest . . . . . . . ,
Seubbers with potential capstaa spring problems which were supplied for , ,
the Midland Projoet by ITT Crianell Corp., Warren Chio. Neuever, per
- Pacifie Scientific Report 85-01, sev. 2, the following sinabbers' supplied *
? ' '
by ITT Ottemall, Warren, Okie have been deleted from the liet of Psa
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ITTGrinnellCorporation RpeHaprD% ion a WestEfahnpeSheet narch s o *84 Rodoknx,ModebluidM1 Takphone(401)811-M Bechtel Power Corporation ,
P.O. Box 1000 Ann Arboro M1 48106 Atta: Mr. E. koser subject: nzotrun - unTs 1 s 2 P.O. No. 7220-N-106-AC In response to your Telex BGH 1813 dated February 21, *84, we would like to provide the following clarifications:
Reference A concerns potential interference problems with clamps / rear brackets
=
for ITT Grinnell Fig. 306/307 mechanical snubbers. The root cause of this problem is a tolerance stack-up problem that was not anticipated in the initial design of the attachments for these products. If the tolerances are fully evaluated in a worst case condition, a potential exists that the pivot mount or end cap of the snubber may interfere with its mating attachment. If this were to happen, there would be a reduction in the included cone of action that is provided to accommodate anticipated thermal movements. Also, this
_ interference would result in a slightly higher drag force on the piping system - but would not cause the snubber to malfunction.
The corrective actions taken were to -
- 1) reduce the edge distances (the distance from the centerline of the loa:' .7tud to the edge of the clamp stock) to slightly over the code 2ainir umsa -
- 2) we redesigned the rear brackets to configurations that would be less sensitive to the large tolerances we had encountered in the pasta and
- 3) we drew all combinations to scale with all tolerances considered and allowed for plus or minus 7 degrees of swing even though we oniy recommend that plus or minus 5 degrees be used.
Reference B addresses the capstan springs in Pacific Scientific mechanicals with potential microcracks which could affect service life. The root cause of this problem has been traced to one of Pacific's subsuppliers and the manu-facturing process they used. The suspect process was to cold draw round bar into a rectangular shape, age harden the rectangular wire, coil into a spring
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s To: Bechtel Pwr. Corp. Page G2 March 6, '84 Attn: Mr. E. Poser 154982 N.'?.
v.
shape, stress relieve, inspect, and then silver plate. A metallurgical evalu-ation concluded that the microcracks were caused in the plating process. The corrective actions taken by Pacific to preclude recurrence were to revise the manufacturing process and add further inspection requirements. The process now followed is - cold draw round bar into rectangular form, normalize the mater-lal, coil into spring, age harden, stress zelieve, inspect, silver plate, inspect again. This process should eliminate the problem, however, if it does not, the additional inspection will identify if a problem exists.
Should you have any further connents or questions, please feel free to ccatact us.
Very truly yours, ITT GR CORPORA TION
. A
- 5. A. DeCRISTOFARO N Project Manager NAD/m (0329h) cc: P. Straube-Bechtel
- T. Smith-Prov.
D. Powers-Prov.
P. Stanish-Prov.
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