ML20086B207

From kanterella
Jump to navigation Jump to search
AO 50-267/74-15A:on 740806,following Simulation of Loss of Outside Power & Main Turbine Trip,Load Sequencing Programmers Failed.Caused by Loose Screws Holding Auxiliary Switch Mechanism.Parallel Circuit Sensing Bus Proposed
ML20086B207
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 11/14/1974
From: Mathie F, Swart F
PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20086B210 List:
References
AO-50-267-74-15, NUDOCS 8311170098
Download: ML20086B207 (7)
v • d • e


Text

_

O o J

punne servlee company oe Odesde s =

, \y P. O. Box 361, Platteville, Colorado 80651. ,y, &.S, g f> <,.

'aaL3r 1 s,

a

/Wilh)]{)

O(~ #0V23;gg :::

NOVS31974 - t 16 " : ; n n, s

.s:sy"~ .. . l*  % ' ,

%  ; ci ss M ';  ;

N November 14, 1974 T . - 39,/

x .J I- \ G Mr. E. Morris Howard, Director Directorate of Regulatory Operations Region IV, USAEC 10395 West Colfax, Room 200 Denver, Colorado 80215 s

REF: Facility Operating License \

i No. DPR-34 f

Docket No. 50-267 t

Dear Mr. Howard:

Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/74/15A and 50-267/74/19A, Finals, submitted per the requirements of the Technical Specifications.

1 Very truly yours, y

la Qt (JM)

Frederic E. Swart Superintendent Nuclear Production ,

Fort St. Vrain Nuclear '

Generating Station FES:ll ec: Mr. Angelo Giambusso a

glgeole c oghbg; 7j g t g w W

. s r a 11877

{

con seNr'5EGION//2 -

L r i

. a

'. . .. O o.

puhue senlee company oe celomeo

, P. O. Box 361, Platteville, Colorado 80651 i

November 14, 1974 ,

Mr. E. Morris Howard, Director Directorate of Regulatory Operations Region IV, USAEC 10395 b*est Colfax, Room 200 Denver, Colorado 80215 REF: Facility Operating License No. DPR-34 i Docket No. 50-267

Dear Mr. Howard:

Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/74/15A and 50-267/74/19A, Finals, submitted per the requirements of the Technical Specifications.

Very truly yours, f y l

h -

Ng Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES:il cc: Mr. Angelo Giambusso l-me r11 -Nn1--; ~'?I' -

~~~'. -Q, w~

li l

{ rd. . .

, - v v - n y + e -

-r ~ n+, - , -

r

. . C) n U l ABNOR'4AL OCCURRE :CE 1 Date: Urivenhor 7, 1o74

" FORT ST. VRAIN NUCLEAR GE!; CRATING STATION .

- PUllLIC SERVICE CO:!PMiY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/74/15A FINAL IDENTIFICATION OF OCCURRE"CE:

following a simulation

!!alfunction of load sequencing prograrmers, 4 of loss of outside pouer and main turbine trip, on Tuesday Aunust 6, 197 .

This is considered an abnormal occurrence, per section 2.1 (f) of the Technical Specifications.

CONDITIO"5 PRIOR Routine Shutdoun

_ Steady State Power TO OCC"RRE"CT.: _ _

Routine Load Change llot Shutdevn

__0ther (specify)

X Cold Shutdoun Refueling shutdcun P,vaetor in helium at _cnp y.frrgep.;

Routine Startup atmosphery*c pressure _

- The major plcnt paranctcrs at the tine of the event were as follous:

RTR, O INth Pouer ELECT, 0 _JNe 0 psig Pressurc Secondary Coolant

'F Temperature 0 Flow 0 ~#/hr.

0 psig Primary Coolcnt Pressure __

Temperature '100~ 'F Core Inlet 100 'F Core Outlet Flow 0 #/hr.

. Page 2 n( /

DESCRIPTION OF OCCURRENCS:

In preparation for running S/R $.6.16-SA, (Sinulating Loss of Outside I Pouer and Main Turbine Trip) a nalfunction of contacts in one Diesel-Generator nain breaker cauced the 252 TX relays (load shedding) not to operate, and prevented any further auto action.

ANALYSIS OF OCCURRENCE:

Diesel Generator uain breaker, The malfunction of contacts on the "B" was caused due to loose screws holding the auxiliary switch ncchanisn; there-fore the switch raised, irstead of actuating the rotor of the switch. Both generators started and cane to speed and voltage but did not load automatically.

APPARTIT CAUSE X Design Unusual Service .Cond.

OF OCCURRE:CE: Including Environ.

Manufacture Component Failurc b __

Installation /Const. Other (specify)

X Operator Procedure Screws not properly tightened initially.

CORRECTIVE ACTIO:::

A ceni-annual prorrn1 has been set up to conbat looco equipret?

in the diccci-generator brec.hers. To cliniate the retnon nade failure, a redundent para 11cl circuit sensing bus voltage has been proponed to and approved by the Directorate of Licensinh. (See attached viring diagrans and letter Richard P. Devise to Richard F. Walker, Movember 5, 1974.)

TAILURE DATA /SIMILAR REPORTED OCCURRENCES:

This equipncat has r.ot fdiled in the past tests.

None

. .. . . O v o g

PROG!ta.!P!ATIC TMPACT:

None CODE IMPACT:

Violation of singic failure criterf.a design.

P n,.9 , -

,f f g / .

'.s o <

Recomended : -FAN p ,27 ,/'7 0I p^ [_- Approved: ;_

J- *< < ' ' cc -

- < >.e -a _ _

Franh M. Mathic Fredctic I% Swart Superintcudent Maintenance Superinteddent Nuclear Production e

=

4

..e... . . . . . . -

81 e / . .

8 P.

g

. i

%J f.

. ~

,. i

()

. 6,

, 4. e

. ,,t .

s.. t e ,s  ;\ , f-

, . ... .. . O.

'. . ,.1

,. ..- .e ..

.. s

. I:.h ij It's  ; :.ie9;5'!). ,;.

  • q .

s g

, 4 9

31, .

3, ' , *- i i' .,[ i e,i A. .. ..,

x. ,.

, . ,... y, u>. t.)

- s .

.. *' e<

> .i- e, P - q,

~

i ...

  • j: ,*

s ,

,4 n ,i, ,

g (1

'.g.,.

. . q. .

s.

.,. . . . f. ' ).

s 1 l.l

<. ,,, en - i fl. . t M . . .; .

s

t. o i %D , , , ..s. . . .;; .~. . . ;l...,,, - ,. . i.a....
t. . e. 4

'"cj I-i ,'.)

. .g ,

c . t .s .-

.g..- , . , . 4s3 .

i,,! 7 *

.3 ew.g

. n'3 8 .

.3 d' ,i,.I = ,, . _ o (s:

. hr f .i- .3 .

s .

- ;s - <#m/yL. _ ..., o e, ;. l.;[,,, ,3 J ;, {

g. .
  • q L. , . f .:

t.c (,:1 -,". ,

.n { d

i ; .n. (, *)- i t.- .

..!., , '.;s '

s.
  • t, a y g.,.

1- N.x. '.. '[' b '1

) [ 4.

. ,. ? . ' .f I.3.'.,' ,

d 0\'.') -.>' . 'l'

'.o .. . ,,.b.','. , -

._m .

. =2

  • f,'! ;. \ . y4 lc. 4,. >,3,5't.. N "yM.H.

1, J .

&C.

y 4.

.,f i

,,.C -

.~ ., ,

.  :;i < ,, au1 1. ,. <. . ..

,.)

..g e-pp,-l

.u j.. .. .> . i .

a. ,

. /. . . ,

  • 14

, , {

  • wi "S ..
l .

/

.n, ;, c,

.a.,

~ yp> .

t o  ;. ,

I s .i i

.sn a.,

,' l ..- 4. . .

w.L ,

t 1 i

. ,4

f. , . o m ao s.

t..,

3. .;.s e.

,c.,  ;.l .

l.

  • i,,

e,  : . ,

s ,.

, ,- ,i 3 t ,.,

r, .;

8, .

v, ..>.. e t

.c.. , ~, i'" ]

.vr

- .-* .... ..n .gys7 . .;

., J

(. ,c, ,j'? .., .i..

g1 ,, . g l _ _ . : - . ..~ . . . . . . .... .., s'.

.. j

,.,,,i .-

4

. i, it-

, I

~ .,

.s

. . L. .

- s- .e e

e

.s 5

s. i 8>'".. .a.

.t <- .< a o e:r .p .

l r

i

/.

c. ,. .
s. a c - ,,  :.. f s

\ :c.- ; , ., e, >

i. ,

y . :

, s. ,s,, m, -

a, ,w. .., - . ., .

, . y a . ,t; ,,

.._,,y.-- -

s a-_. n . .~ .: ;. .L y "; }; -

-c. - .o,. ; . . .r.

r

.r. ,.,. ;,1.

~

g ra

.- j .

" - a. j '-

y ,,

,q >. .- .

m,e

.rs, .

.... s., .o .

J, c.: . ,, :, . s,.

. . .-.. o+. 4 o

toq v 3-  ; a4

., * r.2 . ., .: . .: s 1 . .,,

te i -

.__.o o . ._ _. _ 6. . .,-

- l s_. ._ . .

_n, .

" , w .s' m 1 .m -.  :, -

i . __~

.3 5., .a u.re.,< 4 . ~.i .i - a.

; ,,,, ~. 3, .g.

, ..i j ..

, e.

e .:

.,o

,p .,.

l.

s. .;

1 . .i

..._ ,pp-.. . (

. ..w..,

,. .,.,-t ,..a,.,.,,.... .

j .

, . .. c..,m,

. ..;u- a i .

i

. n

.,s ,s, ,, .

t i

.:. ~ . ,

,, .a

. . . A, . .

. 4 4 .,1,e . \

4 .

ss Iv T..' t <> .y , . , o - s/\/ --

4 E,!s. 3 . . . "

h. .,., ) "

- c i , . ! .,' 1 j i:, 4.. .

} .' : c',i f 'W i . . .

7., o s l h.

' '

  • A '

.. 6

/ o. [*,

  • , /\

. d . ; ,.

3 .

g-4 .. .

  • *' ss .

.. ... J

...<..,u j, j

( 4,

.8

,~ ,.(. i. . . I, . .s

,. . p .u

.1

,;j ;

, i .i

'.it 4' 4

g. . ..

i I - . . . . m.

., 0 t.

5 n' . p...... - .

I.

C.

li t .

fm s.,

,j ' ' ;,j .;c.;,., l .. .'

~ *

\y .

(

r ,

%_s. i:

..., v.

t s.

O'\D ,i , ,. o  : ,

. "* r ..

7Vq,N p , -1 e .

.. . o M.g .

.,4 ... ,1 a.*,., ,*,

. I,l

, ,1ye .' ..)r l 's . .

() .

  • d *' 4 -. - - - - -

l

.ygg A < -. ..m:.r.w} q - '

. ,t il l .! i .'

~

..u .i 't <m . 3 0 . a

!y{ o ei m c .o.m -fl;"- iG "

.)i , c:-

. o .

yu 3., 6

.t .

s.

',, J. i.-

. t , ,, t,, >.

C s w t,: fj f r e t, ...'

1,'. * .

e: e

" , I:.! I ' *

-11.-

.* ..'9 ,.

n.

s.s m,

, cu. , t o!-

'. j

-i. . .

  • e. ,#q . <-:g ,. O.g. s e .

- * .- ( f .. *

  • i I3 ' '*

g

  • e -J A

,,Q t y'. 'I l e et i t , t e t e .* . H . , ,', g ) va y e . . ..p((,p . . . , ,

gj, c3 , ,

vi o c: s'j v i. .a o7 =a.1rra .u c u til .'

U

l. t , t *, ,
  • f)
  • J. ',.(

J.

.q >

y -ll'-

O l- 8 4 i .. t . i.3 (. i. ,'

t; . ---

. l- '.'.;' ;l,' \ e.g

,.. ; U' ;L eJ a ;? y '

f2- , *- * *

  • ;.*  ! t.3* , h) ~ 6i

\ ,Y, b

u .r, p

3 ,,

e n*, .e, 1l,Q . .. .. 3 _.a, Y .', ,,i s,. . ,, ,u

, e. e, g

e. .

. a.

  • ". . l ), , .

~

5 'tit  %' ! ' s .* *a , hl,,I b fy ,

( 3* *'.,*.

t,'*'F* *8 g)-

. f. c .. .. . ..

...-g.---o c

y. i, ., ,s -, s, f, i . ., .J.

... u.. t,si qVc

- ~ ~ j -4 *) IJ e.)

'" t$ . *g , 9 f as)

c. I , g?* g t -- e. f.l- ':>:

\: ~

g.

c'.*

-e ; c:

. I i; ; * . f .J L '-

3 L -~ f'.i s **

[i .

s .

c <-

.',I t.

Ps-t" c.

[g

_ _ g-. .__ _ a a

aJ

.'. p , '

n 4

_.-.,,, _.x.. ., .

.._-i..e~~.--.--~ .

ag , II*-

e. '

s - .,'

E o

}

.* % " . .) l

  • f ,ag e v* . . _..- .: o* 4,y _

n,.- e, - 1. i. ., j ri t. .* '- ',* p ,

  • O i, r.

,n.I

  • ';.' }

,. l '(

o 'g*d' : : ,

a e

- d( .?

ar, e'

. f r .. . [, (S e-- e!-

4'4 ,

' ,a 4 3 e.

r,. ,. . . - t i ,.- . , * *

.  ; l . . 4 l.

, _ ; .- c . 4i ri a.

l l ..'64 N, <}l.1.: . t t i ,s,s :* .

,I I y F. '

- ,fs/ --# -

> a : ,, .

,., r.-

  • se e r1 jg -

l3 6%

U, . .e "* e** .rg

[ 7 h .**

k s' . .

g. .,8 ) *. o v s. s d**

/e yf.*.-l[ '

t!

'.'l a1 . '. . Y, 1 ;-

.- ..,'4 0 *

-. gf\/ \9- . .

g *' .c.

..

  • 6,) n e.

p v o- -. p ; ;

6 4 9

  • 5 lf *- : /

\ v, ( .,'..}y ,

\:* ', ' ,,a 9 * "

\,',

e

? , . . . .

J .- n. .

l ) *

  • k I % [e 8

.g...I 4 .A .

.  ?  ? <. 4

{

d /gil ,

I 1 .-

6 a ,' g ay a e

m

.l ,

0 h q e

- 88c..lg 43 .

3 I k'

  • r) ' ,. O , .

4 A I

./..l.' ,> a.

< ! ., ") . '. ' . . *

. q .-

i- 1
  • o I #

I .1 p

,, ,f ,;

f / I. .. y,

  • [ j# . '? ri I r s-[e P

n e , , .

t; g

,,*., j .f' e.

  • ,e

( ,,

.' f... .

o

,.l, v.i,- t ,8,

' . , . .c . .e +l,.

.j . . , - { : . . > ~ll .: , , , , . . D . . g/\,,4- . .iv a ,' s . '.. l;: -

.p- l .

j *

'h i s. , *

  • ,. 0.1 **s *

...,..se e.

l .

t ,.

.. .

Retrieved from "https://kanterella.com/w/index.php?title=ML20086B207&oldid=2736156"