ML19275A901

Discusses Safety Concern Re Sufficiency of Diesel Generator Capacity to Simultaneously Start Emergency Loads.Recommends Installation of Addl Station Battery & Two Addl Inverters

ML19275A901
Person / Time
Site:	Point Beach
Issue date:	08/27/1979
From:	Lainas G Office of Nuclear Reactor Regulation
To:	Grimes B Office of Nuclear Reactor Regulation
References
NUDOCS 7910220400
Download: ML19275A901 (6)

Text

'D C__

~

4;pa arag(o, UNITED STATES E

i NUCLEAR REGULATORY COMMISSION 3e E

WASW NGTO N, D. C. 20555

(

o

?

'g p#

AUG 2 71979 MEMORANDUM FOR: Brian K. Grimes, Assistant Director for Systems Engineering, D0R FROM:

G.'Lainas, Chief, Plant Systems Branch, DOR j

SUBJECT:

INSUFFICIENT DIESEL GENERATOR CAPACITY TO SIMULTANEDUSLY START EMERGENCY LOADS ON TWO UNITS AT POINT BEACH During the review of the Point Beach submittal in response to IEB 79-06 which required among other things that the licensee modify the 1/3 x 1/3 low pressurizer pressure / level logic to two-of-three low pressure for safety injection, a significant safety concern in the plant electrical system was detected.

This concern is stated most simply as, "certain single failures in one unit coincident with a LOCA in the opposite unit and a loss of offsite power will result in a transient over-loading of both redundant diesel generators." The two diesel generators are shared by both nuclear units. This transient over-load occurs at the point in time when the HPCI's of both units are started simultaneously being loaded onto the diesel generators. The diesel generators would be loaded beyond their "30 minute" rating.

We believe a solution is available to the licensee to correct this safety concern.

We discussed this matter with the ORPM and licensee on Friday, May 11.

The solution entails the installation of an additional station battery and two additional inverters.

The new battery with the two existing batteries for the station will energize three inverters in each plant.

The three engineered safety feature actuation channels of each plant will be energized from the three inverters. This arrangement will preclude the single failure (loss of a battery) which will initiate a safety injection signal. The licensee indicates that they do not plan to take corrective action unless required to do so by the NRC. With your concurrence, we are prepared to issue a safety evaluation as the basis for an order.

m 07 142 1188 259 7910220 0

1

_2

(

We have reviewed other multiunit plants (ses Enclosure 1) to detemine if this problem exists elsewhere and have concluded that th's problem is peculiar only to the Point Beach Station.

i ai Plant Systems Bra ch Division of Operating Reactors

Enclosure:

As stated

Contact:

J. Burda' X-280-I cc w/ enclosure:

D. Eisenhut W. Russell W. Gammill A. Schwencer C. TranTnel G. Lainas D. Tondi R. Scholl P. Shemanski R. Kendall J. Burdain t

1188 260 w

b-'"

c 1

{\\ suk pH ut t L. L, g SHARED H ECTR /C A L SYSTEMS A 'T" M MLTI PL G MN17 Pl. A N'76

(

f

.... _ _ -. = _

L ur.N m r_.

wesrts m rra.ws C A PACITY v C#

E, # cf UN.ITS..

1. CE ^DiiSt25 c.;

SHpngD

.977L-2) fi - _CA pac lT V JA 2e *.

of.

Pe*R. LINIT DIGS c~L S ve"5ltv O Pe*CtmAT ST'Tt2 'f5 yd5/t,..

?__f __

01A_

LRC H __

.IE?

... E.S._

I

_b..

l! N L'1". 5 ?-

'3 0 mW t

2 PER UN/7' ce ri ed

" WAI 3 drg ~

y (f 7TEU

tes.,,secl (k(gF($

l&d '.7L%

%.EITd!2 W S., r 3 C min.

l I

vit c

EN a v 4

~ EA TT EI't'5 04 - E HP.5

~

l

$ d_I1_NS_&S z pitseLs,,p-y z? O ic w tJ O g,,,.

NC 3 WRlu'"d E

.' ypic-re s zpeu v

, z 5.a y n

' '=5 V 0:*

"?

. LIN. l*TS_.1. h 2._..

. __/.u v FC.2 i m ;, i. _

' T 2-S tm sce w ec c z3-po kvJ

Tc sl cf

-~ ~

~~

g Q,,2 ~ -

3n -

.~S ?

EY c:.cl,_.

• • UO'

~

T-

• ieselcpn

• 3A776Lv 2o c V qL 2 CLUNS rs22'/

accc'pe<. "w. -- - 3.. "L' - ic> e t

% 9 das t

s onvT ; C w '

T-e*R, U N IT I

L/Ni i $ 2.,. b b gc A F.,

NC 4,

WI IN

,( qi:$,,fu/

y y r _T.)

NO 31 ~n t'R1 &

C H A E.c,e1 eta,ma a i.

2 9 2 fd kW

• cA r t c @ u'F i o g'a'gw

' CA TT6T'E5

_1.. R L.1 rt.3.W. I C. l< -. - -.

2 ~ME._S.E2 S_

200C d RS

--7 g np z *,,gg

.jy..'

2tC V

~~

P ace u n a -

8 H25 PJO yjy l 7$ 1 k 2.,.

MR VNM Y~:' S cC C hv'

~ ~ ~ ~ ~ ~

~

5

{

~

l,l s't*E T

!., I f f 6 p[Q j

E r!Es

,;.~,- l s - C M E 'u S w ' -

• g.5/

.,.,."."c,.,,

7 *. e-

",,, -, y z

,:cz uwT

. ii s.: 5 2.

n., = ~

zu, i

. '. E 'Ii.I '

I

/.

I -

.[= Y

- mv.

d

. : n -s cc = e..

l7IJ'~~

,e aLCCK

/k..r - 1

'~

PLS z

c,e-u s i c a> <'c 5 O

l LH!!TS

.2,. [b 2.

/$,y17 7.,.

Optg 5 ** M 1

, ri e!.e L j

, p }" g { M Hji{

pny 7 _ _ _-. -

= ouir i

H83 261 gg_, 4-.

7A c. // b 3 I f\\ 10 K.

FEN R t (

SHARED E7_ ECTR /CA L SYSTEM 5 AT MULTI PL E UNIT Pl. AN 7',$

=-

ply;__jhyg_

' DIE 5El S

~BR 778 IGS C APACITY 7 CC CA PAcIT y C.E -.U N I T S _.._..".?..?kh CT.__ WAQ "dATTG)21(b. ___ GF 4

_St 5 2 (*,

a Pi2 UN n-Dissais vi's/No per usar y77e2/F5 ye5/w 3 h/t5ELS 2500 kw 12ATTER Y 7 30 V

~.

./.uurz.s.2k3 - m -._..

W$

L.cs.tLesa SJte.s unir 2

/ RES' DEN 2/aue r z.

23co kW

sua a, 2 3,7ue,f go

-/ uni r 3 repared oscsst Lcnsesse y qu,7 3 UNITS 1.,2, & '3 gw,u a ;, g g t_

, g g,. -

C "M2 0 '2

+v C/N/T Z QC 3 l

NO

<zrv

• ooaw

:<csr /a nir :

e. /

c NQ 3a '^' & CMAN&C UNIT 1 Sf!N6

.79. A7 L k?'CT

• HAMLD.79..

t6900 W

,,{771rit-S.9 N II.2.-

!ggy 4 0/c5tL5/

No

/V ^*' 7 1.. 2.GIz.cg pj

. g g,,.,

,7 $. - 250 v g g-~

h SIf O' lC'N.'.T. I'-

• ?R U0 Y 2D.ItSET$lL*tiliL 2

_, uN /_T 5

1. y 7-2.DicssLS/uusr2 CA M SutNG CCHALS*25 m ec EW ag_

_2/nc7Eey B"ES e

.'1 S" 6 ccur'N to ou S 2 SArre in NO

1. # 'e

. _]a n t r 1

~

zcHAeacess

/2h':SO V __

1 W Fr C HA RGs'R Fe2 8tf77EEY 3 DiESCL&

1. 75c kN I 3rT741?5

/zf V H

E&E3

/$ NIT 2 CWINU (L C}ll;tG_ft,

ec a 42:e s )

gocc e.w lNDlqN _gl alNT

! ?S O C *'

'l G AT7L2 t e'5

/2.$V

" Loco H L5_

hp _ ry;7 2 g

inpt[$(LS/

! NITS

.2., 2, 5 3

/ UNIT 3 EOCC h! S N

(1 CHAE6tR z H E S,,,_ _ _

50R 67s C H )

1753 K w ecurinu cu s G un ir _3

/6'J / -7 22.421r.

2 w, red l i

NC D/E5e45 l Z 2477e'2 a 12 r V krui7 :

I

~

~

/U NIT 1.

n:- (NG N sTEE7 2 c,.r:2 6 g y,-

SA FE P/

Far f TdE S$

=

P*4 O Dn. m, l

o m

)\\ib. s 1,..

1188 262 4187 16

- Ac //6 3 /

K/M KWMLL G

S HA ~RE D EL ECTR /C A L SYSTEMS 47~

MLA! Tl PL C (4 NIT P l. A N 7",$

• -qw7 L g ___

%E'5E,S WTT2IES CP WITY

~F M

CA~AQ)T4

- I.M W" S

a. ?. $ Ib -.. CE -

WlNOh~D..

.SATTGRifS. -

GF -

5 Y C F. U N.ITS -

Va* 5 Pc2 UNIT EATIt2 'f5 YiS/t ;

Pi2 liNIT DIGS c2 S

- - -12fV 2 DA*77EP. - -... -.> & 5 1 t/ E SE4./

S'33o EVA NO NO

/ O 817.2 "/ ae 1:7, 9.g u

,1 g neS

- n ti ca o c Ha u,c ' )

c. AS -7u ni've c o w sT '/

, m,u s C 4 2t' *2 c,un erre rit -

lVlIl L S 7QNb~

cw cas :.aa o n

6 aesN6 S un / 75.7 Et 2.-_

cazuo co~ a

_v.4,Ef.,' y c,..

2 Ql60610 2 670 kW

' 3 A'*~*c21 c5 11T V NO NC

_4 9 i - t Am vir z c:arin u ws 1 c s A Gr2 woo k w

- &M."

Wo "?-

rroreeo.w< eel sw r N c,-

C )* A El' 6%

1. s,2127kW/

~~ ~

L '55~fER'ES

~

t;: Di c: r. :

/ l ~e-V C,iNCEA T.:PS

. C 4 P cc,62

• A VA I ALk' M "' I 1%m

. _.b_. CN E-

..f;=/ P " L"

F G d

~~~

E M e % 4 N?.1 i'reA2.0 k'R ClN I T S L, 2,& 3 pe ut.2h oA d_

S e untT FSAR) c t~

b D/ESELS 2 4 *

• k '^'

2. M7T47!n

' 7 5/ ZSc V C H A Rb"D 2 5/O WJ YEb PERUMT L ACH 2A*TL24 "O

QV ts trair

. C Qml.. -... - - -.. reno, r ed. _ (A U 0. - -,,As own:

l.'EACH S.CTTCM e

~y L M MA u ty ; y ~<'

win 17,6 4,N J Z ?A~7 EEliS 7 / C_ 6' '/_

l.

2 DIESO S 3CCC CN F O U1.17"

.:. +< R m

~~

s'/'S:?"Y.l.*'!:liO yp,& yy 2.ce: H 2.,5

's' j p)g g(.,57

c ' $~ k s!

, h'~2

/ NIT 6 ] b.a Z g[~ra SNITS wp L,.

EMT7E2Y

- ce a i s h '/ 1 3 tii?"i-t

• 6 &' 'O'~

i

,3 g y ;. c . g 2 i j.=. g V

' ' ~

bH I~~." I b l

~ i 12.

E' ^

P t.Q U/,'I T

^ ' ' ' '

.cH2,.

q u i; D rit ES v6 umT e w.,r c

5,m c,

_; &,;p f s-

=

e i f 5, f ce

"/I said DI E 5h 4-i MNITS.1. N l

()l g:E L

)1 1183 263 2

1" ttBAM6

.~

SHARED ELECTR /C A L SYSTEMS AT MMLTI PL E UN I 7*

P l. A N 7 5 kur. Le_

mE5ELS yrrTGIES b.W CF UN.ly$_ _

Of OtYb C

SHARED 77.~ ) L.~5 _ CF

.. _Sl_dp 2 t

Pi2 GNIT DiGSil s vi5l.NO Per UNIT' M7762/f5 yc5/t :

7. D/E'5f4 5 7 5 0 C i 6/

2. ~d477(f /(I

. _./ 7. 7 V W

""~~

CH A.2 vie _SY_ _._

_C:NToNCJcu s

__YES _ _

__E Jg. uutt_ ___ _g. H y_.

j.

E=TH ' uner:

2 9:o h.

c M t662 uiirs,. a, f-ig gas pyz_2gn2 z 7:e &

Mzro

[. @ __

C WM2 k nw e.co.

pcz unit PhN DECPS y~S

[ U./'iT74E'O 5

/~"V

<" CIC Sk'L S NC "; "'

E Nf N/7.1 S$wc,,

2 / U N I T 2-1 w, ' ?. __j & Z_. _

! I.S c

g wr NC.

W N_C] __

I CICS e*L OIL:L d.-

L Sweis$_ _ _

y775R7

._ __ _Z UA'T74'E/E5 2 ?$O N

' 2'SU 3 0/E56

_ _. - _ _.02EY u n_tr$__

'YC S

p. c_2_

.u.n. _>.7 Ibd 2.

/ cH4E6eT NO UI D Ib1 ore o vi-_ y/...

Swta6 24 2 8 iin 6 ofEsa4.

? A"T" s'E Y Dsic;L 2 DoESEl S ncooVW L SA7762tE5

Sv//zr v

^I O 5'.iC_CKW.h'O..

y/ r Cpric:2:

" ric uNJT 2

~ -* 2 S j~r-2

/ eJ Ric I v { I L.C

~ ~ A 7 7: 2,5 5 z roltzc G

^

~ 'liSE h

i:: <N i

fJC (c' ~tn N S ll0

.,.., z

~

!. 5 :_ f N,

/g.,,,.

'i C C C t" W

.,,,., 1, Li/e 175 I b, E k ece n 2. 0

, <,.:,; f-n, u-

's -,. a : e e

/6

.f=,

f i

• p $ i l ubC t h uin L

.._eme i i88 264 a L p 4 7-