Text

Forwards Response to IE Bulletin 79-23 Concerning Potential Failure of Emergency Diesel Generator Field Exciter Transformer.Full Load 24-h Test Scheduled for Oct 1980
	ML19322A562
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	10/31/1979
From:	Bixel D; CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
	IEB-79-23, NUDOCS 7911150095
	Download: ML19322A562 (8)
	v • d • e

--

b t

CORSumtfi Power company a.n.e om sie w n uwe. aw. J.*

a. wee esaos. 4em usasso October 31, 1979 f

l pfr James G Keppler, Director Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PIANT - RESPONSE TO IE BULLETIN NO 79-23: POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Consumers Power Company's response to the subject bulletin is fo6 warded as an attachment to this letter.

L(i

[

David A Bixel Nuclear Licensing Administrator CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement

'"i' n..

egi{c#

I 791)150Ofb

pf

- qw-....

q li; y-

~s

. f.-

V, RESPONSE TO IE BU1LETIN 79-23 i

Question 1:

Determine whether or not connections have been made between lov EVA rated transformers and high EVA rated EDCs without adequate limitations on the If applicable, provide a description of the flow of circulatir.g currents.

corrective action being sien to address this problem.

Iteepeneer Review of the oscitation circuitry used for the EDG at dig Rock Point Plant indicates that connections between the neutral of the generator and neutral of the primary windings of the excitation power transformer do not exist.

The EDC is a " package" unit utilising a Caterpillar diesel engine rated at 350 bhp and Electric Machinery Manufacturing Company generator rated at 200 kv, 0.8 power factor. The generator utilises an integral static ex-807408 citer / voltage regulator as shown on the attached drawing (CPCo Dvs.

30833; Electric Machinery Manufacturing Company Dvs. #3588710).

Sensing voltage for control transformers used in the regulator la obtained from 480 V AC taps (T2 and T3) on the emergency generator output leads.

The generator output is ungrounded (To tap unused) and is connected to the ungrounded 480 V AC Energency Bus 25 through the generator 61r circuit breaker when an undervoltage condition exists (see Dvs. #0740G30105).

It is concluded that Question 1 is not applicable to Big Rock Point Plant.

Question 2:

Provida a schedule for the completion af a satsired full-load operation test of the EDGs for a duration of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or provide the results of a similar long duration, full-load test which has already been The test should demon-completed on the EDCs installed at your facility.

strate full-load carrying capability for an interval of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , of which 22 hours2.546296e-4 days 0.00611 hours 3.637566e-5 weeks 8.371e-6 months should be at a load equivalent to the cantinuous rating of the diesel generator and 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months at a load equivalent to the 2 The test should also verify that hour rating of the diesel generator.

voltage and frequency requirements are maintained and that the cooling system functions within design limits.

Responset.

Presently, load testing of the EDC at Big Rock Point Plant is performed each operating cycle as required by the Plant Technical Specifications (Section This is a short interval test of at least twenty (20) 11.4.5.3.A.1(a)).

minutes at a load of 130 to 200 kv. This test is performed using a 200 kv.

3 phase resistive load bank.

t 4

~

gj

.y

?

+

c:.

5 a

<t?

4 V

(-

r.

y La ansp0Ngt TO IE BULLETIN 79-23 (contd) i

.ouastion 2 Bassoase (contd):

' Actus! testing consists of loading the EDG to 100 kw for 20 minutest record-tas load, voltage, current, frequency, oil pressure and cooling water temper-store parameters. The load is then increased to 190 1 10 kw and asintained for a period of 30 miautes. The same parameters are monitored throughout J~

L the test interval. Acces:ance criteria for a full load test is 190 210 kw

't at 60 Ba% 5% for a period of not less than 20 minutes.

~

The preoperational testing of the EDG was performed in September of 1962.

f; This test consisted of loading tha EDC to an average load of 185 kw for four (4) hours. During the lest hour of testing, a load of 340 amperes and 225 km was applied intermittently to the EDG for 3-4 minutes of every 10 minutes. The overload was handled satisfactorily.

original specifications on the EDG indicate that the diesel engine is rated at 10% overload for one-hour. This is based on a 350 bhp rating at the site (600 f t. elev.) and ambient temperature of 900F DEMA Standard Practice.

Full load rating of the generator is 200 kw at 80% power factor. Specific information regarding a two-hour tattag is not provided.

Name Plate Data is as followst M

. Caterpillar Serial #625289, Series A Model f343A 6 cyl 5 4 Bore 6.5 Stroke g

RPM 1800 B.F. 319

. Bill of Material or ESO No.15260 s

Generator Electric Machinery Manufacturing Company

-Serial iIR980611 Type BRKT Frame 127 KVA 250 RPM 1800 V'

480 Cycle 60 Phase 3 ~ F.F.

0.8 AW 300 Inst. Book 67

. Based upon the one-hout 10% overload rating on the engine, lack of two-hour rating on the generator, absence of neutral connections between the I..

generator and excitation transformer and anximum load demand on our generator 3

of 215.8 kva (172.6 km at 0.8 power f actor) we do not feel that the test as

[.

outlined in this question is applicable to the EDG at Big Rock Point Plant e

(see attached load profile).

a

-s i

s I

~E' y.

Iq, y_-

-y.

P

~.. a

+i _

?

k h j,-

s 9

-+

~

m - +

w

-.-w,rv 4,,.-

.,-m,.

n m m e -s.nwce

=. t - ;

ce

h' RESPouSE TO 1E SULLETIM 79-23 (contd)

' i

- 4 ouestico 2 Reseoese (contd):

'l '

We do feel, however, that a full load 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months test at 190 e10 kw is a l

reasonable test to assure satisfactory operation of our EDG and we have

.ao objection in performing such a test. Procurement of meteriale, test equipment, services (if required), etc.s preparation of a suitable test procedure and scheduling at a convenient outage will dictate the earliest opportunity to perfors such a test. ~ 1a any case the test will be per-formed no later than the next refueling outage, currently scheduled for October, 1980.

t

-I i

[ / U 7

P S

g.,

I f __.

4 l

i e

W l

e j' i

9,

s g

!u i

.}

+ ~.

- 1 y=- -.

r

5

. '4t'W

-lt 3t

-. l, lll y/

RESPONS, TO IE ButLETIN 79-23 (Attachment)

"T A M s

=

y

-a v

l 1

2

-?

I, i

ms 3==3..o.4.%

3 ur. o m oe i

g b,

t t4

' M-Iin 3

I w

s 5

g 9

O

'g

l I8 1

-1 ]

j

$l o

e l

gi e

1 i

,, i s y

A l

l-k 8j i

e w

.,v l **

T oe-;,

el e

ssee.es otaeaum u nao

-wa;

)

2 N

s w i.n ace.n ws gcv I

illI

. 2, onu s - se.

I, II J

e em+ =3 1

)i..

E 3

I..

l.

dll

.i 5

I a

WI I

^

\\J n

a s

g i

I

h

~,

l j

i m om,

i l

,3 i

e 3

g3 i

j i

an.a u,=

a.4 3.o I

a

.I s

t s

n l

t

. a an.,a w

u-

.L

.'s

[t-,,y t a

a

-( )

8-e

'L-O e

G

'f-,

=

7 o

1 e

l l e

hl ia i

$!hd h !! i h,'il kh l

' IIlb!Y niil iiv m -a i

a n -- g..

n.,

3 s gllll

!![! J !k i,hgh g;1

. l O l i

u i

I s

!l' fl

! !,! o'i!!' $@y3 I i

1 4[, :+i,m!

u

, ana i

n 6

lI"d" $otns D.96Eb14Gi$."iidiffiG -.

i!;,

j *i {i,, i::n. 4 q;t J, i

1, 4,.

igj.

I!

ki sS' i

, Mi

+.., @-

i g:

l

g,,

w ua

.a e m

v.

. x, T.g.s l

t i

d. m i

t f

A-y

~

I,j. 1,,#

l w n;d

=

M: Y

' i. '

D'-

'3l"g.

- d*

. hNef EE!

'h ((

b

f. i!

A7_[ q %

- f.f.+b l

i

,i b,n i

8 ni,

i,,

g.w '

r{s"i[(

t.s g

an '

~e-e !jI,

' c. ?;

y--

q

~

i A

j wlS -~

i

.:. lJI! l

e3 q

I,-[3 JG M['ss%"l:,'!jk,,

ij l

_ M~

lI.

-t j

1 k

,1 ll 1, 4 I

=

f i

r*g igmn-1 ws

=

j

=.

i M

's'1;g fig

[$!

i i.i it

+J.,m.c ask e

.2 g

z y,j s

( %

o j

'L i

o 4L._ _

>3,,-

0 I

.I kk, Y

f h $$?

t

i

'rq u

w-w w

.it

.M:~ J J S -'f g

lrb'

! Nlh M Jr g

r[IIld$$'4wi

'd2 d

Q#l Jg JE.:,2 7 -

3 1 D

i y

i,

_M.__ '~ 93 L

2_

I filhi sl

p..

O h

I

!!g 4

im

,, &g!

ne p"#g. 'lla 1j (l lglit th 1.

v 4 r

],

E l

t i

1 si

'l,l=p>~rfygg }

rv

' i

!"f u[,

E h,l il !. W i

4.,thoi!.!,

H a n!,

t is e

u gu j d. E ' E G E 11 j!g lyl,j g y',, 7jg unu e

pJi e, r gg 3.q p u a

+.', 9,i nMid

_s i

,y l

g, ~

.o e w:-

]a

~

p i

ti

<c.r f _ b[J

'I i

~

T

t ge

'g eg W

n s

i g d O, bh

%, 4 1. d j

IEE Mi, e.t E, 4 13 3,.

a v

g er e,

i.

l

.-..);.,--[w~

T';" 5.

hli ?-LidSh )a m S}i Mis

.R$

-,3 u

m

.~gse,- I' f! r-'"..,, -gas.

k:$}.

h

sd b T. ~ 'ig'j 4

hl I.E_. = ^

.3 g a#m.p ut M: + b 7:

g'I

{(b-r,,-

g =!

5 i

i

-i U

l I

O.sl Y I

W D $ a;~t-.r}F,

( rhi 1

g/gr:-

. 'h :'! u5,.

w M2 gj 4

5 I

N"-!Il Wj./m gI 7'

. !GtW p

d

!h.:.

b b;!;

-s i

m

-$b

, J Vg

- k4

$ ON N{

l l

S' "

d I

f

, i:

i L

,f!

P

+

r d

t

.)

%{l

-i

'C 4

.g..-

hv 2

"bg I3,f H :d e ] [.

~M i 2

l ti

.3

~

,g f

}

{'s 1 t

i' 1

e, o

o i

Li7 s

g o

lg

4

_5_

3 jd

! !, {j i

g

~

ga t

i i i 5

- !.y

^ h8

[ 3

$ [

3 4 M+k a

-i 8

h

.i

@! S j,

o y

NM f

Wqi

, I

$h{0 L

g e

.Y.

i,!#3$:'

a_.J.nsN<

m.,m-

,- n.

h f,h his N

m

'. g...

>2 4 7 "I !

1 75 1J';

J t

M

\\

-J j PE.V; 5

[

I a

@H

d 'l w:A >

~=

4tiliji!,

4 i.

, ; r.-

(

r h.. r--

c:, '.,p;; i. 3 ff

[

' In 2

l; e'

i.,I s,

!!'iii

5l Mipll s

4.

a l l

!IgT-T

-[ ll l I

+

m c ;p u'

di gI i

T f

1 I v !!

q c

'e

]

l, S E.} $f, a'

4 a I

E ado 3.HClimE32!il 5

d.. -.Eh.iik

\\

l

~

I Ol* O, H..u...

J

\\'-

t 1

_

ML19322A562

Text

Navigation menu

Search