ML20126C014
| ML20126C014 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/01/1980 |
| From: | Autio H YANKEE ATOMIC ELECTRIC CO. |
| To: | |
| References | |
| NUDOCS 8003250053 | |
| Download: ML20126C014 (2) | |
Text
. _.
wf e, VANKEE ATGMHG ELECTING COMPANY y p, 3
A,<%
- c'.
?
N $ ANams:
I * }. f (;
(
} 14 r
',ini'rl M o:,
- f n? n;-ro.-
r i m i.,
!)f f 1; r
'l
} q $ 1'c'f ' I: i.ii' l ( ;. ;f'ovn' we b, !
6'I pgt[ $ g pg,; p n 3g *r[
1
)d?.$llie f t r t '/ ;? I'! 's *4
- 1 6,
Iloijti - 5
.9 t,.a t p.,
ig to.c. u 3...
j ne % r~ n
len 3 i m i - t %
w,' m t r u M.
ci i...
Putsuant f,o t he ti piirement s of lechnical Specificat ions, Sect ion 0.9.4.A(5), the following is repor ted as 1,icensee livent Report 50 29/80-8.
On.fanuary 19, 1980, with the Plant in a Cold Shutdmm Cotxtition, the tine delay relays which operate the Accirwolator Nitrogen valves wre replaced wi th nn irgroved rv.stel.
Following re;11accrent, a test circuit va'; used to veri fy tirwer operatio t ard all t imrs Gru.tloned properly.
i,ater in tin week during, r.urwillarn* test inc. of t he cot ere ci rcuit ' the tirvira fnited to l
ope t a t.e.
Invest igation vi to why the tirwn s did not operat e revealed thsit the s c l ay, we r" po i n t ity <ensit ive al though them was no indicat ion of this in tic instru:.t ion lit eratut e or en the relay itsel f.
11v.: siguni leads were reversed an d t h" t. im rs wo rked p r ope rly.
The relays which had teen replaced wem irrediately checktwf and niso found
'to be pointity sensitive.
These relays hnj been installed in October,1979 nnd pinred in service Nove*r 5,1979.
The relays in service prior to Novembe r IM9 wre not poln: i ty sensi tive.
The inatn) Int ic+ doctrent at icn for the October replateiw?nt was checked to d e t e min e low t he po l a r i t y o f the ittpu t leads were connected.
Ihe as built schenatics doctrent:ttion is conflicting relative to tJte polarity orientation.
Ib Alth<y.igh the viring connection in Noverber cminot be veri fie41 with 100%
certninty, there is a prehabilit y thnt t he poln r i ty o f the si gnal lend '.<as reversed.
If, irmn furt her investination it is shown that the polarity wac in frict rever<cd, t W ucci.rulator systerr wuuld not have functioned although the roonthly mirveillance test ing would show proper timr operation.
Tiw ent i re ci rcui t will be rcter.ted to veri fy proper o;x. ration prior to j
starttp and caut ionarv st eps n&ied to approprinte doctanent s as to the polarity l
sensitivity of this equipment.
1
&y(
~
f b
O b
ej o
3g
_, y,. _
s J.=.
- - a.
+_.
w JL p
w n t.
l P
Furtbar details of tMs ocoarreme will be submitted in the required 14 day follow up re;mrt.
Very truly yours,
~
'$y p.
6 St A Herbert A.'Autio-Plant Superintendent e
=, r I, *i g.
,)
../.'
-k,
' /
s
.I
+
u 6". 4 '
. (, '-
j
,s
?
,Y,
,,a; t
n t
,A.
%'.{
- ~
r t
si 2
g-..
(
-b
.*4
%y'
-.-y ;,.
c g
4v g).
r.. #. ~.. g g c < d...., t.
+
s
. ' g. -.
s
-, g ;E (., q,..
,.,-)2 -
4 E
4
.n..,,g.
t
\\
. w.r,m( p np
-*>,u p;
',g.
y
.s,;
e -
. x
,.d.s e u
,a.
i sa l
g3-
+
e4 p
g
? '. ; $. -
1.4 ?{ ep4
'r, cf.!:
e 4
% )
r f J ', ::e.' J -
4, Y- ;.
.' ),
(
3
+
M y
44 f-'.4 n,
. -N
- p i
h a
T e
l r
..h. - ',
ft s
t*
me,
vl
\\ r c
s s,,
s p
s
.,yY e
+'s.
s 4-n s
l
,I
'.I.,i*
h p/
k I
'Y k 4
h y. A,,, Q-y i
x<
.m a
a
)j.,y,.g;1
,.n.
ypp> g..Qgggg;g, y4gy. yg g.,,3 g;
- x. -
r.,.,.y y;,
r.
s-.
n s e + m., %.,
3 v z2..
. g#.'3 J )'..'
- s. t. ;
4 c
i
_ w
. um.
p' Q. h,, p, 9.#ljgts,'; g;h.;,7 -,, c s Q,,l h..y {J..$ '
x'
, s- ],..L
' ' 4, 4, f'] (J', igf 2 t-[ j J (4Q.i
- J$Q3 I
N0y,,, ' iyp~.,,r.a,.,*O}-p.. j-) 5 j ';,,g
@.k '
[,
}*t } a -i{ "J'y, $. {.q.. ' 9 ' #lm.y..Wp '
-y 7 G * ' _j%}
.w',
i'f
( ;l
- . -- 7.p,< g#,.
c.
s p,
s
-, 3,:
3,., m g.-
ei 4 y ;y_ _q ;.,,,., y.~.g-2{'p,,;. m, J'-?
i, 4
~.s. gf.
t c
y,,,
.w;r% ].;,:.
.~.'t-(.
1.w A,, R s
..,+
'I. 7: (('t[y %'.} g:p.
e.%.
-r
$,m.['. b".' ks b.*h ;'yd,,f,)'d
.t p
f, j..
h I $,k. h4'4 Nh-D
..q_.'-
.h E
[.
sf[ /. f['
" j -
4 e
/~
J 4
y 4
g y
4, g
b, 88 I
g d
s.
I 1
I 1.
e 1
a.
0" 4
r.
A-e e.-
7
,