ML20084L092
| ML20084L092 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/04/1984 |
| 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 30268, 83-11-#3, OL, OM, NUDOCS 8405140336 | |
| Download: ML20084L092 (21) | |
Text
-
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Consumers Power Company General offices: 1945 West Parnell Road, Jackson, MI 49201 e (5171788-0550 May 4, 1984 83-11 #3 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosavelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT DOCKET NOS 50-329 AND 50-330 POTENTIAL DEFECTS IN MECHANICAL SHOCK ARREST 0RS FILE:
0.4.9.83 SERIAL:
30268
Reference:
J W Cook letter to J G Keppler, same subject:
- 1) Serial 26651, dated January 6, 1984
- 2) Serial 28041, dated March 16, 1984 This letter, as were the referenced letters, is an interim 10CFR50.55(e) report concerning defective capstan springs in Pacific Scientific mechanical shock arrestors. The attachment to this letter describes the investigation of this concern and the corrective action taking place.
All suspected capstan springs are being inspected to determine whether cracks exist. A final decision on 10CFR50.55(e) reportability will be made when inspections have been completed.
Another report, either interim or final, will be sent on or before l
July 27, 1984.
JWC/AHB/cd l
Attachments:
- 1) MCAR 75, Interim Repot; 3, dated April 17, 1984 CC Document Control Desk, NRC RJCook, NRC Resident Inspector j
Washington, DC Midland Nuclear Plant 1
DSHood, USNRC Office of NRR INP0 Records Center 9@
8405140336 840504 MM
]
hDRADOCK05000g OC0584-0002A-MP01
r e
2 83-11 #3 Serial 30268 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, Esq_
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 Paton, 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 Washington, DC 20555 Washington, DC 20555 Dr Frederick P Cowan Ms Barbara Stamiris 6152 N Verde Trail 5795 North _ River Road Apt B-125 Rt 3 Boca Raton, FL 33433 Freeland, MI 48623 Mr Fred C Williams Dr Jerry Harbour Isham, Lincoln & Beale Atomic Safety & Licensing 1120 Connecticut Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission Washington, DC 20555 Mr James E Brunner, Esq Mr M I Miller, Esq
~
Consumers Power Company Isham, Lincoln & Beale 212 West Michigan Avenue Three First National Plaza l
Jackson, MI 49201 52nd Floor Chicago, IL 60602 j
-0C05S4-0002A-MP01 tm
3 83-11 #3 Serial 30268 Mr D F Judd Mr John Demeester, Esq
' Babcock & Wilcox Dow Chemical Building PO Box-1260, Michigan Division Lynchburg, VA 24505 Midland, MI 48640
'Mr Steve Gadler, Esq' Ms Lynne Bernabei
'2120 Carter Avenue Government Accountability Project St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 Mr P Robert Brown Clark, Klein & Beaumont 1600 First. Federal Bldg Woodward Ave Detroit, MI'48226 i
i r
- OC0584-0002A-MP01
Serial 30268 Bechtel Associpjpg gfessional Corporation 83-n #3 148I76
SUBJECT:
MCAR 75 Potential Defects in Mechanical Shock Arrestor Models PSA-1 and PSA-3 INTERIM REPORT 3 DATE:
April 17, 1984 i
PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 I
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 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 l
spring manufacturers.
ITT Grinnell has identified 283 shock arrestors furnished to Midland that contain suspect springs.
Summary of Investigation 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.
Subsequertly, PSA and ITT Grinnell have recommended that additional inspection / testing of suspect snubbers be performed. This is further addressed under 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.
0503u
k
[.
Bechtel Associates Professional Corporation j
l48178 lkO32l l
MCAR 75 Interim Report 3 j
Page 2 l
Root Cause As discussed in Attachment 2, the root cause of this problem has been
. traced to one of Pacific's subsuppliers and the manufacturing process the subsupplier used. The suspect process was as follows, t
a.
Cold draw round bar into rectangular form b.
Age harden the rectangular wire c.
Coil wire into a spring shape d.
Stress relieve t
e.
Silver plate i
A metallurgical evaluation concluded that the microcracks were caused by formation of_ spring tang after age hardening at 900F followed by silver plating.
i c
l-i l
Corrective Action l
1.
Field engineering has identified suspect piping shock arrestors on i
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 is being performed to determine that no other disciplines / areas on the Midland project have i
similar conceras. Any deficiencies found will be documented on a i
- NCR. This review will be completed by June 25, 1984.
2.
All suspect shock arrestor capstan springs will be inspected for cracks; all defective capstan springs will be replaced. This I
activity will be completed before fuel load, and will be tracked via NCR C-00949 (or any additional NCRs resulting from Item 1 above).
l 3.
Corrective actions taken by Pacific to preclude recurrence were to revise the manufacturing process and add further inspection
{
requir-' its.
The process now followed is a.
Cold draw round bar into rectangular form b.
Normalize the material i
r 0503u t
~, _ _ - - -
Bechtel Associates Professional Corporation IkOl[O Ih832j aCAR 75 Interim Report 3 Page 3 c.
Coil wire into a spring shape l
'd.
Age harden e.
Stress relieve f.
Silver plate h.
Nondestructive examination Reportability I
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.
_kffSubmittedby:
3 th
.B.
Poser A
Project Engineering Manager Approved by:
B.R. Klein l
Plant Design
'lef Engineer Approved by:
-LtA u
[
E.H. Smi6h" r
l' Enginee.' g Manager l
[
Concurrence by:
for M.A. Dietridh i
l Project Quality Assurance Engineer l
RFT/MS/rar*(PD)
I Attachments: 1.
ITT Grinnell letter to Bechtel, 10/5/83 (com 131017) 2.
ITT Grinnell letter to Bechtel, 3/6/84 (Com 144941) r 0503u
14832i ar pec 148178
- -.f I f I 1310l; 143930 i
ITTGrinnellCorporation Exemde 0/#cer M WertExchangeStreet Ptonidena, RhodeIsland02501 (401)831-7M October 5, '83 Bechtel Associates Professional Corp.
P.O. Box 100 t
Ann Arbor, MI 48106 Attn: Mr. E. M. Hughes - Project Engineer Re: MIDLAND PLANT - UNITS 1 & 2 I
n l
P.O. No. 7220-M-106-AC l
M
Subject:
Pacific Scientific Mechanical Shock Arrestors Model PSA-1 and PSA-3 O
Capstan Spring Potential Quality Problem Gentlemen:
o l
Attached please find a copy of Pacific Scientific's letter to us dated 9-21-83 O
(Attachment I) which identifies a potential quality problem with Size 1 and 3 Mechanical Shock Arrestor Capstan Springs. The scope of the problem is identi-S" fied on Page 4 of 5 of the attached report, and the arrestors supplied to ITT Grinnell are summarized on Page 5 of 5.
A review of our records indicates that the mechanical shock arrestors - as i
listed on Attachment II - have been supplied on the subject contract by ITT l
Grinnell. We are confident that Attachment II represents a complete listing of the arrestors supplied to your project, since of the (2,888) arrestors supplied to ITT Grinnell, all but (70) units (19 Size #1 and 51 Size #3) have been identified to a specific customer shipment. Any additional arrestors supplied to your project will be identified to your attention as soon as possible.
As a valued customer of ours, we are bringing this information to your atten-tion for appropriate action. We recomend that you contact the following -
directly - to resolve this problem:
Mr. Paul A. Hadnagy - Director Technical Operations or Nr. Peter M. Zatezalo - Director of Marketing t
148178' 148321 131017 143930 ocE f 33 i
Pacific Scientific Co.
1346 S. State College Blvd.
l Anaheim, CA 92803 i
Tel. No. (714) 774-5217 It is our position that all charges for this effort are to Pacific Scientific.'s account.
Please let us know if you require any additional information.
Very truly yours, P
I'IT]
q0RPORA' ' ION g
O k
(CI
'V N. A. DeCRIST0FAR0 (p Project Manager M
NAD/m (Att.)
IlO cc's w/Att.
R. Kon - Prov.
F. Shepard - Bechtel/ Ann Arbor D. Sewell - Warren O
B. Kelly - Prov.
P. Zatezalo - P.S. Co.
O P. Hadnagy - P.S. Co.
! O I
l l
l i
.. - - ~
I4832i
~
T,- U Kin Tech Divisi:n
$y I48l78
~ PB Cil:lC SCIENTIFIC i31017 143930 21 September 1983 t
N '. b'MN%
D. saw%
B.v-cu.Y ITT Grinnell 621 Dana Street N.E.
Warren, Ohio 44481 Attention:
Mr. T. Lauka i
Subject:
Pacific Scientific Mechanical Shock Arrestors Model PSA-1 and PSA-3 i
o
Reference:
Service Report No. SR83-01 Gentlemen:
to The attached report discusses potential problems with certain o
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 sr.ubbers to us for
- o inspection and repair as necessary.
If the snubbers are still l
in warranty (one year warranty if shipped prior to 1 April 1983 l
lO and five year warranty if shipped on or after 1 April 1983),
this will be dona at no charge to you--excluding freight.
Should the units be beyond the warranty period, there will be a $100.00 I
per unit charge, also excluding freight.
l l
All affected snubbers will be returned to you within 30 days aftep we receive them.
l The foregoing will apply to snubbers returned to us through 31 December 1984.
1 We apologize for any inconvenience this may cause you.
Very ruly yours, l
4 P. A. Hadnagy Director Technical Operations i
PAH:sf l
hrrAcrimeMT 5 1346 S. State College Boutavard, Anaheim, California 92803 (714) 774-5217, TELEX 65 5421 7c, / eF 8
, Kiridech'Divisian l4832i Pa CIFIC I48178 SCIE nTIFIC 131017 143930 sa s2-01 SHOCK ARRESTOR CAPSTAN SPRING SERVICE REPORT 1
During testing of Pacific Scientific Company's PSA-1 Shock Arrestors, part number 1801102-05, at Union Electric Callaway Station by Daniel International personnel, 4 of 7 snubbers tested revealed a broken capstan spring tang.
Pacific Scientific Company requested failed springs for indepen-dont mer.allurgic,a1 examination.
Failed components were returned to Pacific Scientific Company who forwarded broken springs to i
"Mettek",1805 E. Carnegie, Santa Ana, CA 92705, (714) 549-1083, for metallurgical and fracture analysis.
One spring exhibiting a visual crack in one tang (removed from FN.
snubber S/N 21524 which was returned by Union Electric) was in-l stelled by Pacific Scientific Co. into a snubber and subjected i
O 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 M
- test, This test cycles the snubber at 3 Hertz intervals from 3 to 33 Hertz for 10 seconds at each interval at 100%, 75% and O
50% rated loads, a total of 5940 cycles.
The cracked spring satisfactorily passed this test.
(
l c Springs from the identical lot as those that failed were traced I
to snubbers located at Kansas Gas & Electric Co. Wolf Creek iiO Station.
These were returned to Pacific Scientific for testing l3 and evaluation.
I Eleven (11) each 1801102-05 PSA-1 Shock Arrestors returned to Pacific Scientific Co. by Kansas Gas & Electric Co. Wolf Creek t
i 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 I
disassembled to a level permitting verification that the capstan spring was properly' installed and whole.
The Shock Arrestors j
were reassembled and subjected to a successful acceleration test I
at full rated load (1500 lbs.).
I l
l Following successful acceleration test, all eleven Shock Arres-tors were disassembled to facilitate visual and non-destructive examination of the capstan springs:
l S/N 21511 - No apparent visual defects.
Magnetic particle non-destructive examination revealed indications in both i
spring tangs with one tang exhibiting three separate indications.
Indications were suspected to be micro l
cracks.
T 1346 S. State College Boulevard, Anaheim, California 92803,(714)774 5217. TELEX 65 5421 7 g f-
paga 2 l43930
- SNOCK ARRESTOR CAPSTAN SPRING SERVICE REPOIC -,(Cont'd.)
t i31017 14832i S/N 21512 - No appar i ual defects.
Magnetic particle examina-l tion exhibited an indication of one micro crack on i
one tarig.
S/N 21513 - No apparent visual defects. ' No magnetic particle f
aramination indications.
i S/N 21514 - No apparent visual defects.
No magnetic particle I
examination indications.
l S/N 21515 - No apparent visual defects.
Both tangs exhibited l
a magnetic particle micro crack indication.
l l
S/N 21516 - No apparent visual defects.
No magnetic particle I
examination indications.
I i
l S/N 21517 - No apparent visual defects.
No magnetic particle i
examination indications.
j op :-
rw S/N 21518 - No, apparent visual defects.
Both tangs exhibited i
a magnetic particle micro crack indication.
' - ~
S/N 21519 - No apparent visual defects.
Both tangs exhibited j
l
~3 a magnetic particle micro crack indication.
j C3 S/N 21520 - No apparent visual defects.
One tang exhibited a l
magnetic particle micro crack indication.
l
\\
t S/N 21521 - No apparent visual defects.
One tang exhibited a
! C3 magnetic particle micro crack indication.
l t
l C3 Five (5) capstan springs exhibiting non-destructive magnetic i
particle examination indications were assembled 2nto a test anubber and subjected to a dynamic load of 1500 lbs. at fre-quencies of 3 to 33 Hertz intervals for 10 seconds each at 1001, 75% and 50% of rated load.
l The springs tested represented the " worst case" as determined I
by the non-destructive magnetic particle inspection.
They were l
S/Ns 21511, 21515, 21518, 21519 and 21520.
r Springs, S/Ns 21515 and 21518, survived the entire test (5940 I
l cycles).
Spring, S/N 21511, survived 533 full load cycles i
before 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 i
cracking during subsequent silver plating.
l l
"ih 3.e F l
I43930 14832l
' 53 3 SBOCK ARREyfQg gTAN SPRING SERVICE REPORT - (Cont'd.)
a51urgicalreportalsoexplans at, 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) r'upture.
This accounts for the ability of the springs to withstand the full load functional and dynamic load testing conducted and suggests that the useful life of springs which contain cracks remains to be substantial.
The capstan springs are manufactured for Pacific Scientific Co.
by a spring manufacturer.
These springs are supplied formed, stress relieved and 100% magnetic particle inspected to Pacific Scientific Co., who then subcontracts the springs for silver plating.
Pacific Scientific Co. part numbers for the capstan springs are as follows:
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.
Recommendations m
At your earliest convenience, return the affected snubbers to Pacific Scientific for inspection.
O Inspection will inelude 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
+.o be assessed by individual owners i
based on snubber system application and analysis of results of O
tests conducted on failed snubbers and reported herein.
l Affectec Serial Numbers l
PSA-1 Pacific Scientific Part No. 1801102-05 S/Ns 15672 thru 16921 ru sza o c, Ls i.
18211 thru 21160 21411 thru 22060 22311 thru 22710 Z178 u
2.tg t.o PSA-3 Pacific Scientific Part No. 1801106-05 i
S/Ns 21311 thru 21610 zosse uco 2 cst.jl qsg 24311 thru 25310
- 810 25361 thru 25960
)
27194 thru 28543 tozot 2.o 3$ 5" O
1.0 TS s
=2.o t,1 (.
4ri j
s.e 4eo
+ 1 t, se39 10(37 g 4..,s j
s o,..
ITT TrinnM
~ ATTACIDEENT & ~
[4832i
~
131017 1)
Model Number PSA-1 Part Number 1801102-05 and -07 i48178 14393'O serial numbers 16 st s tuo svuut 16667 thru 16733 16754 thru 16920 i
18346 thru 18445 18709 thru 18724 18725 thru 18735 18736 thru 18765 18766 thru 18908 19482 thru 19551 19552 thru 19576
(
19982 thru 20081 l
20418 thru 20547 20691 thru 20736 l
f 20961 thru 21060 21061 thru 21084 22443 thru 22542 l
22711 thru 22860 O
i e
, 79 O
l-(
2)
Model Number PSA-3 O
Part Number 1801106-05 and -07 l
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 i
21565 thru 21610 l
506 thru 510 (-07) l 486 thru 487 (-07) j 24311 thru 24410 21461 thru'21495 20302 thru 20395 i
20551 thru 20636 20398 thru 20400 l
/
l 7 s er f
/
3 s
NilNlJ ud I310I,,
I4832i a48178 ONTRACT:
- SIZE #1 PAGE: P 143930 0060 MD-A21 MIDLND 2-617-5-123 OC62 MD-A21 MIDLND 1-603-3-595 l
'8G74 MD-A21 MIDLND 1-616-4-526 l
19d2 MD-A21 MIDLND 1-616-4-526 l
8076 MD-A21 MIDLND 2-617-5-122
'8967 MD-A21 MIDLND 1-616-4-527 l!0072 MD-A21 MIDLND 1-616-4-539 i
' 9549 MD-A21 MIDLND 1-616-2-509 l!1004 MD-A21 MIDLND 1-616-2-509
!:1986 MD-A21 MIDLND 1-616-3-500 fle71 MD-A21 MIDLND 1-616-3-508 1963 MD-A21 MIDLND 1-691-2-512 0530 MD-A21 MIDLND 1-616-3-501
[ 0479 MD-A21 MIDLND 1-616-3-509 l 8034 MD-A21 MIDLND 1-616-3-509 1974 MD-A21 MIDLND 1-616-2-533
,0993 MD-A21 MIDLND 1-616-3-525 1529 MD-A21 MIDLND 1-616-4-542 l
8519 MD-A21 MIDLND 1-616-4-530 6520 MD-A21 MIDLND 1-616-4-530 0996 MD-A21 MIDLND 1-616-4-529 T970 MD-A21 MIDLND 1-616-4-529 92 MD-A21 MIDLND 1-616-4-530 l
1307 MD-A21 MIDLND 1-616-3-503 1972 MD-A21 MIDLND 1-616-3-507 8473 MD-A21 MIDLND 1-614-4-523 0991 MD-A21-MIDLND 1-616-4-536 M73 MD-A21 MIDLND 1-616-4-537 l
M83 MD-A21 MIDLND 1-616-4-541 M39 MD-A21 MIDLND 1-616-4-541 F990 MD-A21 MIDLND 1-616-2-582 l
T300 MD-A21 MIDLND 1-616-2-502 8863 MD-A55 MIDLND 2-617-5-131 8842 MD-A55 MIDLND 1-616-2-534
'8726 MD-A90 MIDLND 1-652-1-522 l
l8789 MD-A90 MIDLND 1-652-1-523
'0046 MD-A46 MIDLND 1-EBB-2-3-H4
! 8785 MD-A90 MIDLND 2-652-1-519 8824 MD-A90 MIDLND 2-652-1-520 f
8730 MD-A90 MIDLND 2-652-1-521 8721 MD-A56 MIDLND 1-638-14-501 9729 MD-A56 MIDLND 1-638-14-501 9711 MD-A56 MIDLND 1-638-14-503 8720 MD-A89 MIDLND 1-603-1-500 8712 MD-A89 MIDLND 2-639-14-500
'8732 MD-A89 MIDLND 1-603-2-38 i
9731 MD-A89 MIDLND 1-616-2-535 3716.
MD-AB9 MIDLND 2-652-1-504 3724 MD-A89 MIDLND 2-652-1-505
)
3715 MD-A89 MIDLND 2-652-1-596 3723 MD-A89 MIDLND 2-652-1-507.
1719 MD-A89 MIDLND 2-652-1-509
,7' [!
3722 MD-A89 MIDLND 1-652-1-510
'1713 MD-A89 MIDLND 1-652-1-511 m
1727 MD-A89 MIDLND 1-652-1-512 Oh(e i
I, i
F mMbue{
ik8Il8 I4037'.
)
131017 C(NTRACT:
MD SIZE #1 PAGE: 2 l
l 143930
' 18725 MD-A89 MIDLND 1-652-1-513 18733 MD-A89 MIDLND 1-652-1-514 10728 MD-A89 MIDLND 1-652-1-515
{
- -16425 MD-935 MIDLND SULK j
14558 MD-935 i
! 14843 MD-935 14782 MD-935 if467 MD-935 r
i 18487 MD-957 MIDLND NONE LISTED 19519 MD-996 MIDLND
=
19532 MD-996 i
19512 MD-996 19548 MD-996 i
19507 MD-996 19558 MD-996 l 19088 MD-996
! 19538 MD-996 1M36 MD-996
=
i 19495 MD-996 19496 MD-996 l17497 19499 MD-996 MD-996 I
l g98 MD-996 l 16593 MD-996 l ag548 MD-996 16532 MD-996 16547 MD-996 ig42 MD-996 e
l'8599 MD-996 Ig49 MD-996
'16548 MD-996 18588 MD-996 1C562 MD-881 MIDLND 2-619-6-189 l16441 MD-881 MIDLND 2-619-6-109 18349 MD-797 MIDLND NOT LISTED 18371 MD-979 l 18379 MD-979 l18481 MD-979 MIDLND BULK
{
l18486 MD-979 i
22%7 MD-D82 MIDLND NOT LISTED l22449 MD-DB2 MIDLND l 22451 MD-D82 22052 MD-D82 22455 MD-D82 22 56 MD-C82 MIDLND BULK i
12058 MD-C82 MIDLND
!2068 MD-D82
!2461 MD-C82
- 2462 MD-C82
.2464 MD-C82 MIDLND BULK 2066 MD-D82 2468 MD-D82 2469 MD-C82
,{
2478 MD-C82 l 2472 MD-C82
' t.
~2. O
131017 Md / "#
l48178 14832i DNTRACT:
MD SIZE 81 RAGE: 3
' 22473 MD-C82 22G74 MD-D82 22476 MD-C82 l
22078 MD-C82 l 22479 MD-C82
- 22488 MD-D82 22081 MD-C82 22082 MD-C82 I
22083 MD-D82 22084 MD-D82 22486 MD-C82 MIDLND BULK 22098 MD-C82 22491 MD-C82 22495 MD-C82 l
' 22496 MD-DB2 l
22585 MD-D82 22586 MD-C82 l20522 MD-B38 MIDLND 2-617-5-43 i22536 MD-DD2 sutM 1
=
l22717 MD-D81 22728 MD-D82 23722 MD-D01 49723 MD-D82 22738 MD-D81 L
NEP41 MD-D81 12742 MD-D01 l?2745 MD-D81 i!@747 MD-D01
!22749 MD-D01 i
,2t752 MD-D81 22753 MD-D81
,2f>63 MD-D01 i22771 MD-D81
'22776 MD-D01 i
22781 MD-D82 22783 MD-D82 22786 MD-D81
?2789 MD-DB2
?2798 MD-D82 12791 MD-DB2 22792 MD-D82
,?2793 MD-D82 i
22794 MD-D82
,?2795 MD-D82
'22796 MD-D82
,?2888 MD-D01
'2881 MD-D01 2882 MD-D82 i
! 2803 MD-D82 2885 MD-D81 2886 MD-D01 2807 MD-Del l 2888 MD-DB1
,(
L 2818 MD-D81 bb!
2811 MD-D02
m 2 /a w al
- 4g;7g CONTRACT
SIZE #1 RAGE: 4 b 2 8' I43930 22813 MD-D01 22815 MD-D82 22814 MD-D01 22817 MD-Del 22818 MD-D81
=
22819 MD-D82 22828 MD-D82 22821 MD-D81 22822 MD-D81
-22823 MD-D82 2282G MD-D81 22825 MD-D81 22827 MD-D01 22828 MD-Del 22829 MD-D01 22831 MD-D01
-22833 MD-D01 Q 34 MD-D01 22835 MD-D82 22838 MD-D01 22839 MD-D81 22850 MD-Del Q851 MD-D01 2n56 MD-D81 N MBER DF RECORDS FDUND:
189 O
O t
O r
i t
t I
F t4du
~4fhWS
/t,'y@;Mh V'O 'd
- 0"3't"ih'#fM"'**
e'
,5 W%
PSA105-R01 ITT GRINNELL CORPORATION PAGE l' *
[
10/03/83 PIPE HANGLR DIVISIUN - WARREN
,I J 06:09:08 PSA LUG BY LUNTR ACT y.-, y,-. m.
Wh CONTRACT MS - WIDLAND 1,
I ij
-- RF R t M ' NG DRDFR NO MARK 75KFTCH NUMBER 512E db 24318 E-MD-A21-00 2-632-2-23 3
- j
~~
u 24322 E-MD-A21-00 1-610-1-504 3
C3 E ' ' Mnm EUE9
.E')Y-MD-A 21-00
'l-616-2-505 m 3 N.
24353 l
()
fr
_ 24 354 - '
E-MD-A 21-0 0 1-610-1-503 3
E-MD-A 21-0 0 1-610-1-507
3 i
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ITTGrinnellCorporation Aim #wwerwenn MWestExdagekoet narch 6,
's4 honickna, ModeMudM1 Takp%me M01)811-M Bechtel Power Corporation P.O. Box 1000 Ann Arbor, MI 48106 t
Attn:
Mr. E. Poser Subjet.C : MIDLAND - UNITS 1 & 2 P.O. No. 7220-M-106-AC Gentlemen:
In response to your Telex BGH 1813 dated February 21,
'84, we would like to l
l provide the following clarifications:
l etence A concerns potential interference problems with clamps / rear brackets l
for GriE1nell Fig. 306/307 mechanical snubbers.
The root cause of this problem a tolerance stack-up problem that was not anticipated in the
\\
initial de ~ n of the attachments for these products. If the tolerances are l
fully evaluate n a worst case condition, a potential exists that the pivot l
mount or end cap the snubber may interfere with its mating attachment. If l
this were to happen, re would be a reduction in the included cone of action 1
that is provided to acco date anticipated thermal movements. Also, this l
interference would result in' slightly higher drag force on the piping system - but would not cause th nubber to malfunction.
l l
The corrective actions taken were to -
I
- 1) reduce the edge distances (the dist'ance from the centerline of the load stud to the edge of the clamp stoc'k) to slightiy over the code
- minimums,
- 2) we redesigned the rear brackets to configurations' that would be less sensitive to the large tolerances we had encountered 'i the past, and
- 3) we drew all combinations to scale with all tolerances consi ed and allowed for plus or minus 7 degrees of swing even though we on1Q recommend that plus or minus S degrees be used.
N N Reference B addresses the capstan sorinas 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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'148321
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To: Bechtel Pwr. Corp.
Page #2 Attn:
Mr. E. Poser March 6,
- 84 144941 148178 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, coli into spring, age harden, stress relieve, 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 comments or questions, please feel free to contact us.
Very truly yours, ITT GR CORPORA l' ION N
D_
t h __
M-N. A. DeCRISTOTARO N
Pro.fect Manager NAD/m (0329h) cc:
P. Straube-Bechtel T. Smith-Prov.
D. Powers-Prov.
P. Stanish-Prov.
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