ML20070T110
| ML20070T110 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/30/1983 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 20685, 83-01-#1, 83-1-#1, 83-1-1, NUDOCS 8302080205 | |
| Download: ML20070T110 (10) | |
Text
e
@ Consumers POVver James W Cook Vice President - Projects, Enginee,ing and Construction General offices: 1945 West PerneH Road, Jackson, MI 49201 e (517) 788 0453 January 30, 1983 83-01 #1 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR C0 GENERATION PLANT DOCKET NOS 50-329 AND 50-330 POTENTIAL 50.55(e) ON LOOSE LOCKING CLIPS IN INSTRUMENT CABINETS FILE:
0.4.9.73 SERIAL:
20685
References:
- 1) Letter, B&W to CPCo, CPCO-4095, dated Decembet 8, 1982
- 2) Letter, B&W to CPCo, CPCO-82-258, dated November 30, 1982 This letter 1s an interim report on the potential 50.55(e) condition concerning loose locking clips (Tinnerman Speed Nuts) which was reported to Mr R Gardner of your staff on January 4, 1983. Reference 1 (Attachment A) informed Consumers Power that B&W considered loose locking clips a condition reportable under 10CFR21 and that they were notifying the NRC of the problem. Reference 2 (Attachment B) was their notification to us that they were evaluating the condition through their " Preliminary Safety Concern" system. Reference 2 provides a description of the specific locking clips in question and the possible results of a locking clip coming loose rhich in turn could disable a safety system.
Our initial investigation, in response to B&W's early correspondence on the possible problem, resulted in the conclusion that we did not have the (aluminum finish) speed nuts which was the specific subject of their concern. Our potential 50.55(c) was made as a result of determining that we had some loose locking clips but of apparently a different part number than what was reported in the referenced letters. Attachment C provides the description of the specific nonconforming conditions found in the NI/RPS and ECCAS cabiners.
The investigation to date by Consumers Power Company, Bailey Controls Company, and Babcock & Wilcox has determined that the flat black and olive drab' speed nuts are the correct part number, and that the deficiency resulted from improper installation in that the speed nuts which were observed to be loose had indications of not being seated properly.
8302080205 830130 PDR ADOCK 05000329 f[Q g }gg}-
5 PDR OC0183-0055A-MP01
2 Serial 20685 83-01 #1 The next report, either interim or final, will be sent on or before April.1, 1983.
It will cover the inspection and repair activities required to bring the panels into conformance, WRB/lr Attachments: A) B&W Letter to CPCo, Dated 12/8/82, Serial CPC0 4095
~
B) B&W Letter to CPCo, Dated -11/30/82, Serial CPCO-82-258 C) CPCo Ncuconformance Report No M03-9-3-004, Dated 1/7/83 CC: Document Control Desk, NRC i
Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant 1
CBechhoefer, ASLB Panel RSDecker, ASLB Pancl-FPCowan, ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair
-BStamiris CRStephens, USNRC WDPaton, Esq, USNRC FJKelley, Esq, Attorney General SHFreeman, Esq, Asst Attorney General tandarshall GJMerritt, Esq, TNK&J Great Lakes QA Managers t
t f
OC0183-0055A-MP01 l
Attachm:nt A Serial 20685 7
Babcock & Wilcox w.., p.,,., o.o.,,$1 83-l
.n oi,i.i.n a McD.rmott company 3315 Old Forest Road P.O.6ox1260 Lynchburg, Virginia 24505-1260 (804) 385-2000 December 8,1982 CPCO: 4095 File: 12B/T1.2
~
Consumers Power Company 1945 Parnall Road Jackson, MI 49201 Attention:
E. T.f. 'SEf1MF Manager, Safety & Licensing Departments
Subject:
Consumers Power Company Midland Plant, Units 1 and 2 LOOSE LOCKING CLIPS IN INSTRUMENT CABINETS (PSC-13-82)
Reference; B&W letter to T.J. Sullivan, dated 11/29/82,CPCO-82-258.
Dear Dr. Sullivan:
This letter is to inform you that B&W has completed the evaluation of the subject concern.
In consideration of the comon mode failure potential that loose clips could disable a safety system, we find it reportable under 10CFR21. We are, accordingly, notifying the NRC of this problem.
' ' I~
Adescriptionoftheconcernbsprovidedinthereference'letteranda d
Service Bulletin previously' issued is attached.
Both recommend that an f-
" inspection be conducted in your.NNI, ESFAS, and RPS cabinets and, that
/ El ",^
all spbed nuts No. C7818-014-67 (aluminum finish) be rep,1 aced with'No.
C185-014-4 (dull, dark finish).
If you desire further information, please contact the undersigned at-804-385-2207.
i Re:;Dectfully,l&L er i
D.
J.D. Agar Project Engineer For:
D.F. JUDD SENIOR PROJECT MANAGER Attachments JDA/leh cc:
RC BAUMAN WH SPANGLER g/
RL SAKER ID GREEN
l.L':'.O W W.-
I f.-
.,,w.n e.
.l V
sd 2.Jr.vu m au
~.
25 003
- l 5--., -
f-M l.% S
"-Y h
...-. m
=
[
).
TERMINATION PANEL SPEED NUTS A.
Description of Problem I
.1 Some termination panels in the ICS, NNI, ESFAS, NI/RPS and plant computer systems supplied by Bailey Cc,ntrols Company (8CCo) use "Tinnerman Speed Nuts" l
j to fasten the terminal OlocKs to tne panel.
Tne speed nut is pushed on over i
1 the insulated post wnich surrounds eacn terminal on 'the system wiring side of l
- n. _
tne panel.
Some systems were assembled witn speed nuts wnich may not t
=j.
in a) tne terminal block becoming loose, 0) a speed nut contacting tne l
,5 adequately grip tne outside diameter of the insulated posts.
Tnis may result a
SS uninsulated portion of a terminal and shorting to adjacent terminals or tne 3
cabinet, or c) a speed nut falling off a terminal and into the area below (tnis 3j is possible where there is no wire on the terminal).
4 e2DN B.
Identification of Material:
w;
- i. t ina J pnospnate coated Tne suspect Tinnerman Speed Nut is Catalog No. C7818-014-67, 7',
with two coats of aluminum paint, wnich has tne appearance of "sniny 11gnt
{, j
~
ggd metal." Tne recommended Tinnerman Speed Nut is Catalog No. L185-014-4, phospnate coated and oil dipped, wnten has a-dark, dull' appearance.
There are
--=c o significant differences between the two fasteners in inside dimensions,
[
v material tnickness and material nardness. Tne superior properties of No.
,h C185-014-4 nave led to its exclusive use oy BCCo.
BCCo part no. is
}
4ac 1 NMQC122000.
- ~
.W O
C.
Recommended. Action:
j
.ge(n Cneck arli terminal blocks on. terminal panels in BCCo-supplied NNI, ESFAS, g
.w d 1.
r Cd
- NI/RPS, ICS 'and' p.lant computei cab.inet;s for 'alumintam-finisn Tinnerman Speed 74 d Nuts.-
~
g~
3j
- e.
2.
Remove and. dispose.of all sushect' ipe_ed nut's
.~
7-
- v,
- ', l 3.
Vet'ify that tne surface of the terminal post is smootn and undamaged.
o
-s l
gij No.te :
If, the.termiilal post has Deen' da'maged,'use adjacent, undamaged post
[
ry a to fasten the terminal block.
m -a (C'~ d 4.
Install tne recommended type of speed nuts to the terminal block posts.
I i
p-J Ml Note:
Ine recommended speed nut offers noticeabie. resistance to being i
N' installed, indicating a correct fit.
55
.w-g toi.-
l.
smar <
i@
25-003
>n t
y f-f i
- r.e ir. formation in tr.is advisorj s'oald te use: ;a '. / w 1!"
- rc f:llo "' n* - *CO '? t ir:
?,dt:Ock and a; :On
- Jses 10 warr3ntj Or re: rete". tat'On ecrt5 5 ;r ~;'
- e d 3 5 *C d 2 r3C/.CO*
T*FP 5 :P Jie-i
. ' lceu cf e W;r aticn cere!n er trat tre sie Of t'ils
-f r-c :- 411 no. i {r m .**:
ra ec ri-*M ; I t
n
-1 n::::s anc a:::. m es no it2:ility relat:r: to use, cc a
- es f* ' ese Of W " x " :' v 'Oie "ere'"
k-
A d$'.bY51.W.!.t.'
\\q
^-
C a
- t.N t w.H '. *
- 't..:. :
p g
~
.;..u-wow (...f 0.25-003 a.=-s - - v.v a r--
- +, - - :- - - --..
.c_
-. :_::: ::;- ~ __
.e.-....
..t...
i 5.
Perform an independent inspection to assure that.
a.
All aluminum finish speed nuts have been removed.
l E
b.
At least two dull, dark finish speed nuts are tightly in place on each
.i terminal block.
Tne terminal olocks are not capable of"being moved with respect to tne c.
cabinet mounting s'arfaces.
?
eed se
-1 A
-b
,]
l
'1 L..'.
hI n
re; d
1
^
- a 1
.1
)
i i1 l l
3, 5
L- - l h-t
.s
~.
1
]
g
.y y
'e t.
1, a
p- '
5 25-003 7
i
<m g-
- 9 h '. l L
- mW
Attachment B Serial 20685 83-01 #1 Babcock & Wilcox no i.., p.., o..r.iion oivi.i.n a Meo.rmott company November 30, 1982 3315 Old For.st Road ESC-633 P.O. Box 1260 CPC0-82-258
[8o"[seM'#"
Dr. T. J.TI fvan Consumers Power Company 1945 W. Parnall Road Jackson, Michigan 49201
Subject:
Loose Locking Clips in Instrument Cabinets (PSC-13-82)
Dear Dr. Sullivan:
This letter is to inform you of the subject Preliminary Safety Concern which is under evaluation at B&W. A problem was noted at the Oconee Nuclear Station with the locking / attachment clips that secure the terminal boards to the terminal panels in the ICS, NNI, ESFAS and RPS instrument cabinets. The terminal panels are located at the bottom rear of the cabinets. The problem is that the clips tend to come loose.
This concern may be applicable to all B&W plants and may be reportable under 10CFR21.
B&W is continuing the evaluation and will keep you appraised of the results. Thus far, the investigation has revealed the following information.
Some termination panels use "Tinnerman Speed Nuts" to fasten the terminal blocks to'the panel.
The speed nut is pushed on over the insulated post which surrounds each terminal on the system wiring side of the panel. Some systems were assembled with speed nuts which may not adequately grip the outside diameter of the insulated post..It is possible that one or more speed nuts will work loose or completely come off the insulated posts.
This may result in: a) the terminal block becoming loose, b) a speed nut contacting the uninsulated portion of a terminal and shorting to adjacent terminals or the cabinet, or y a speed nut falling off of a terminal and into the area below (this is possible where there is no wire on the terminal).
Two different types of speed nuts were used in the Oconee instrument cabinets.
The suspect Tinnerman Speed Nut is Catalog Nc. C7818-014-67, phosphate coated with two coats of aluminum paint, which has the appearance of " shiny light
. metal".
The correct Tinnerman Speed Nut is Catalog No. C185-014-4, phosphate coated and oil dipped, which has a dark, dull appearance.
There are significant differences between the two fasteners in inside dimensions, material thickness and material hardness. The superior properties of No. C185-014-4 have led to its exclusive use by Bailey Controls Company (BCCo).
B&W is not aware of the exact locations of suspect fasteners within the ICS, NNI, ESFAS, and RPS.
I M 87F M
-- ~..: g ; Ty
./
v.
y DEC03 52 H**\\ft.'m
~--. p l..'
~
' ' Although furtner investigation and analysis may be necessary to resolve the PSC, B&W has recommended that Duke Power Company locate and remove all Speed Nuts No.
C7818-014-67 (Aluminum finish) and replace them with Speed Nuts No. C185-014-4 (dull, dark finish). We recommend that Consumers Power Company conduct a similar inspection of your cabinets and replace as necessary.
The correct speed nuts may be obtained from BCCo by calling Tim Radley or Bob Dennis at (216) 944-9010.
The correct speed nuts are stocked under BCCo part number NMQC122000.
In replacing the speed nuts, we suggest that:
1.
All aluminum finish speed nuts be removed and disposed.
2.
The person installing the correct speed nuts should verify that the surface of the terminal posts is smooth and undamaged by removal of the aluminum finish speed nuts. Otherwise, he should use an adjacent, undamaged post.
He should also verify that the correct speed nut offers significant resistance to installation, indicating a correct fit.
3.
An independent verification should be made that all aluminun finish speed nuts have been removed and at least two dull, dark finish speed nuts are tight on each terminal strip. The terminal strips should not be loose with respect to the cabinet mounting surface.
If you have any questions or comments, please contact the undersigned or D. A. Naptor at 804-385-2249.
Very truly ours, J. D. Agar Project Engineer y
=
y
+ws
,---y n, - -
~
Attachment'C Serial 90689 83-O I
@E NONCONFORMANCE REPORT p #1 3
~
i PROJECTS. ENGINEERING AND CCNSTRUCTION MO3-9-3-004 qA 37.o 2.
33E-;.lP ST3=N:
3.
FRI3=: CO3:
- . CDD CM3
?.
A; =3 :=N =cs 3
M-7 (x6)
S-1963
&2 4.
73C43 "*:
7.
3C3c 370RMING FART 30 8.
- C3%uCG FART 3AME:
7 3:3 :33:2l::
1C41, 42, 45 NI/RPS & EC W 1/7/83 2C41, 42, 45 Cabinets 13.
3C3c3FCR!C3G FAR 11.
FISPc33:3LE CRGX=A =38
- 12. I.0cAI=3 :3 FLAAT:
13 M 3 F T.Z73=3:
33' *'3*'
Control Room N/A Bailey Controls Co.
!^
659' Elev.
- Is:s:3u:.rBHPeck ts.
ACTION: I Bailey Controls Company supplies N1/RPS and ECCAS Cabinets having IDGreen I ian terminal blocks which are fastened to the termination panels by INFO:
li7Schaeffer "Tinnerman Speed Nuts," a spring clip type of fastener. Babcock &
WRBird DATaggart Wilcox Operating Plant Service Bulletin #25-003 (Attachment to the JEBrunner RAWells (continued on page 3)
AW d u.
Senec3re m sczi C
and Inspection of the affected cabinets revealed the A
B-2 MADietrich following:
1)
Five (5) Tinnerman Speed Nuts were found to be completely -.
GSKeeley off of the insulated posts.
BWMarguglio
- 2) Ten (10) Tinnerman Speed Nuts were found loose to varying REMcCue degrees.
DNf
- 3) Two (2) terminal blocks were capable of being moved with y
respect to their mounting surfaces.
1,.
m r.,.arR, 16.0 (continued on page 3) m 10 IS.
Ec:3ecr::ED PaaT ww.... ms:
B&W to investigate and determine:
u.
-:3o X
1)
If the speed nuts on Midland Plant equipment are the same
- =res==3 m:
as those considered " suspect", in the bulletin, but of a different so.
m cc:r.
X color.
mt (s=r ucri X
2)
If all speed nuts are properly installed per (cont'd Pg 3) zt.
nects3 a l
s:t:g,1 None 23.
- cca= = 3 er m s' 22.
2?.~"/4 /83 c f$"4 :07PM i
TE F M220RT:
- M OF ?ZFCET t
.IPCR332 FE3 e
25.
?IPCRTZD SIa 26.
REPCR:ZD TQ2 is.
1
!3 fo W t X
WRBi'rd/MJSchaeffer RNGardner n.
.==3 R.,u==- :
n.
- 3. - m3=
i w
,c3==mm,
/ [j l
DANott 2/4/83 pg y
22.
rAn =Rrs=:n Ac=3 ncrcszDi y
l 33 a :=:.wz33-a=,:A=>
Reference Oral Communication Record Serial #20657 dated 1/4/83.
n~
@lw-k
.F E
21s.
FART ORPJ= "E AC=3 3373l::
f j
~
Sh i.i jy NN Aad,.ME 2,.
= = =: > ~= m=.
- n.: ;A;s.cr. ; at.amA7.72.:a=:
2.
- m. : :s= ar. 20::A:.72.:A=4
a r
NONCONFORMANCE REPORT _.__.
s.,_-
~
oo3_,_3_oo4 p
na man, m PROCI55 GORRECTIVE ACTICN mm _2_ e 3
- x. a w w at aman Unknown, to be determined as part of 50.55(e) follow-up.
- s. w
- nu. anor cumuss. 2 urruere rum mas un m - a mm. memansa na naams casi s.
= - imm..
~
O
-0 O
- mus Babcock & Wilcox ea -
- - - = na a ca.
To be determu.e*, as part of 50.55(e) follow-up.
1
.e.
naams a m a sus a musi casus :s sunr,w a as e assuuns...
t i
al. 4135 e FREEN 3 YERIF:21:23:
5=. 2 30..uarmIN,3 FUB <- a swu i.,,w ::lpe.J=3:
- a c::se'z=:3.ta2*D JT/a3a
,,3
-a-7
,.,.w_.-m...
-,,-m,n_.-
-,19--9,7 g,,m
..__e y.,y..
4v,..
NCR#:
MO3-9-3-004 DATE :
1/7/83 PAGE:
3 of 3 BLOCK #16 REQUIREMENT CONTINUED:
NCR) expressed the possibility that the speed nuts could come loose and indicated the possible consequences. The bulletin describes the suspect speed nuts and gives the P4W's recommended corrective action (Section "C" of Attachment)
BLOCK #17 NONCONFORMANCE CONTINUED:
None of the Tinnerman Speed Nuts in the Midland 1 & 2 Cabinets are of the type described as " suspect" in the B&W Bulletin. Speed nuts used on Midland equipment were found to be of two different types. One is dull green in color while the other has a dark, dull appearance similar to that reconsnanded by B&W as a replace-ment for the " suspect" speed nut.
BLOCK #18 PART CORRECTIVE ACTION:
the manufacturers recommended installation method.
3)
If the recommended corrective action described in the B&W Bulletin is an adequate repair for the condition.
I
__