ML20049K178
| ML20049K178 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/25/1982 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| 3720N, NUDOCS 8203290491 | |
| Download: ML20049K178 (6) | |
Text
, _ _ _ _ _,. - - _ - -
.Y
/
\\
,/
) 3.. t + e...
, e. 9 i t --,p m.>
} 4 44 se, ha p. ' g 4.e b + d { *. p D-a 4 M I l
\\
/ 6 w ey e u - g ts <t s t 1
%J i
1 Niut A l'en t j
m:
n( )
Q t
3 z
tj UM O II Cf('e==
o n..no r 4 ibl t
+. f i a s 4$1654lh 4 p{qiich p/
ei 81>~ 46+,we>, 4
>f p
4 4,,
11l${4{WH HI 6!k.biibIisj
"'"f
- h j[
u, 4,
h e { s g f n e w i s t u g g [ 9 6.a ( 4 4 { b 4 t-4.;//gth i
.on e y p.a. n em
~
N
+n 4,- u. o. st, u,u un aa n, t ena s t ;t 91,4=1-6 9 4 *nd / Diaval 64%f*toi, v94twa s ha t i e.noni; y s
r* ri f * -nl e 09 f iH d t h
- F i t s
)444lhg is@#htp fai. a...- e s t 46 tis a61 tts e lig
-.._-iff- - - _ - _ - - -.. - -.
Lby((nh ii I
.k Y
54 0 h
- % i l -$
o:t ilili; is)i 15: 4 4 9 $ +ed, s t *1 ( +5 tuq err *"dl+ 9e H a* Hitzli e
kd3i
$4 k9}h4 I ** 4 h k, l Sk 4k l *H ;f 4
- *. 41 % a:*:n;
- ?
'h*
44+ g,fr.e6,, 5 {L{k_f>\\\\nf lk km yt-pfd4 { hla } + s1 l usH uit (46--b4af4*e () 956$ oi, 4 { { e 34 $ 1, 5 F 3 594 *jn' d{E4s{ ab t.hl g { h { (
H
++ 5 t44 4
,+44ts v.f { 4, 65;#r 4 5 ; a.....
s t e n,4 4,oi'w og
.. q,
,es.4
- .-J tal+~4 f*rt64"'I4lle**i 4*
O h f *
- d 5 f 4 1
x 7 4.:,g 4J e&-t44644 a-A o-g f,g l -(t j 9 ;. -4 n 45[ %F43 { q,9 3 {
- . 4
- 1, 4
4.aes 4&s{ $ w 4 - j $ + w a. * - - + $ 4 g 4 5 pj -$j~+) L -4pl { 0 ma g(14 pu ty4y.-.e e z g o.f 4 n,i -
4 3...
9 g+.4,t.,14,,p-4 g 4 l '-
-+AI5*,
p
~4 46 d o+4*-g4e7* 7.k~>((.->p WI U n a l l + -4 $g y{n 9
- .4 4i 5 4f.m i s o -- j s : 4 4 4 ).,,43 w$ 4pg, A f { s t g-; f 9 { {,, n j i 5,
.p s
4 c4 ee- -
4-.;r t+434,, to 4'"
ri e'l-*i
' F *f9'd s
g.43.-.
+ _$ :# g # i ef i
.-s e-29++#t4_.. {3,i $ + r
- i l * <
- l e l l '1 l
1 It j,j gtif e
t w,. m, y 6 ; f i +-6
, m. 4 p 4
ffM j
4 W
j s
A. Schwnncor March 25, 1982 thn t.aballu hpC5 and LpC5 pump loads) has demonstrated broad start-load tolnrancns for those diesel Generutors with step-loads ilyntficantly largur than the normal start-sequence loads.
I'lesel unnotator In%ponse f rom such tosts resulted in more severe transient u f ulo r v o l t a g n and undorfrequency conditions (NEDO 10905-3 previously guhmittnd, and thn pr o-oporational load ma rgin tes t discussed hornin), with n%9entially tho same rncovery times.
These tests
%hownd that thlu OG dontyn in insonsitive to marginally lower finyunncy and vn!tagn thro 4 holds identiflod in Soction C.4 o f Hog.
14u l '1 n 1.1 Adoquatn rneovary and stubility margin has been
~
dnmon%ttatnd f or CLCn to concludn truit practical conformance exists.
pre oporational to%t In%ults for DG-0 and OG-1 A show that on!thot coapilnw with olthnr frequoney requiremont and that OG-0 dong hot mon t the mlf imum vollnyn toquirement,
we have summarlzod thn4" togt in4ulty lit thn attachnd tably.
As {ndicated in th13 Iobin, thn elingn1 unherator 4 are on!y mardinally deficiont in ninntinu thown toquirnmonts.
Ihn triinimum frequoney that oither dingni ynlpi t a t u t nitpotiented w44 of tl y $ 6.) hg o r '/ 4% o f nomin41, ufid Iho f t nyunney inoowntoil tu wIthin 's oI nomlndl beforo the finat load
=tattod.
Ihn mihitaum voltoun that Die =0 niipor tnficed during the loadinu 9nqunntn was t.t./4 o f hominal und occurrod af ter the Li'C5 pinnu 4tattod.
followthu thn 4pennd pump (lutli) start, the voltnge ilfnepnd to /1. n of hominal, fho voltaung f or both 0109n1 unhn t 4 till 9 tntovoIod tO wlthift IO% oI nom {haI kfl 10h% then $0% 0I thn load snqunhtn (lite r val.
oninimihnd that the Olngni unhotatorg enn potform na havn thalt 49fnty ininted f unclinh wit h ndnquato malditi wi thou t man t ifig th"an voltaa ahil findunnty taquitomaht4 for thn f ollowltid 19a90041 n
1.
Ihn in41 in40lla v ntify lfust ihn dingol unnotatut% can statt inil einintain all of thn lin loads to ratnd ceand within ihn taquitnd tion potidt! without faillhu.
i Ihn "alallaload Nidin I nal t a= ult a Onmon9tinto that d
ihn,IInc"I uanntathi= 4an attnpt 4 % Inn ihail lucin944 that le ul a at ot than 1% o f thn i W, p u +0 t o t i n u (l%od hp ) and undut o voltajn 0100% to inst t h a h r,0 % o f 41 e
- I ri 4 % e k ilii49 t n 4 pu t i n #11. t hg ih M,14k1 kip t n ed t t lild I f t achnialut,oltaan M ilan=n ut thability nf the voltouu la im o,nt, the o ws % I;ln (n=tw vollflod it enold at4tt
+,4 m rulotain a 1 1d falnd at ving hp (1/p0 kn) wilH"qt f allio as N t ihj thl= toat Iha vnllaun diopped la
- ,,o
, nit a nt so,nof in.+ 1 n 21, the oct.% dingol o osts.laya lot,leton it whit o sin 41-11at to ihn of,letan I <. m i ; o sti q ain 4hin in otalt and au ni n =
tao j i as
><o isc ori. p.ce, p noe tact in whit h th"
<at!9e0 49 111 n111, wo -t oced, ihn mit9aa an tuosa i.,jts,,mts a, si,tt af n otaal, ellhout
>4 tim +F4:
f t
A. Schwencer March 25, 1982 3.
During the ECCS loading sequence no loads tripped due to undervoltage.
The undervoltage relays on the 4160 volt ESF Division 1 and 2 busses are set to trip at 2625 volts, 63.1% of nominal, which is below the minimum voltage that either diesel generator experi-en d.
Even if the diesel generator voltage decreases e to same values experienced during the margin test.
it can restore the voltage in suf ficient time before the undervoltage relays trip.
These relays also have a time delay feature.
At 2400 v;olts (57.7%
of nominal) the time delay is 5 seconds which is greater than the load sequence interval, and at 2000 volts (48.1%) the relay operating time is 3 seconds.
The diesel generator overcurrent relays will not trip its output breaker because they are bypassed in the accident mode.
I V
As a matter of inte(kst, CECO has been working with the DG vendor, Stewart & Stevenson, to define optimum phasing of the field augmentation relays.
We had made several field adjustments per his 3 recommendations prior to the latest preop test series which this letter cites.
Thus for no significant improvements have resulted for transient voltage and frequency parameters.
Commonwoulth Edison Company concluded that the diesel generators can perform their safety-related function with adequate margin un currently installed.
The FSAR will be revised in a future amendmont to reflect this information.
If there oro any further questions in this matter, please contuct this office.
Very truly yours, 3lgg)W
^
^ ^%
O C.
W. Schroeder Nuclear Licensing Adminstrutor im Attnchmente h
- eoi hne nnio,nt in.p.etor, u.c; J N04 e
~
~
b y
Die _sel Generator Test Results l
Test Results for DG-0,
- jst Results for DG-1A, T
l R.G. 1.9_Recuirement ESF Division 1 nF_ Division 2 1.
Minimus voltage during load 1st pump start, LPCS Pump (1500HP),
1st pump start, RHR "C" Pump (800HP),
i secuence > 75% of nominal min. voltage = 2650V = 63.7% of min. voltage = 3465V = 83.3% of nominal.
l rating (4T60 volts).
nominal. Note 1 g
2nd pump start, RHR "A" Pump (800HP),
2nd pump start, RHR "B" Pump (800HP),
l min. voltage = 2990V = 71.9% of min. voltage = 3150V = 75.7% of nominal.
nominal. Note 1 i
2.
Miniass frecuency during ist pump start, min. frea.=56.8Hz.=
lst pump start, min. freq.=56.6Hz.=94.3%
.l load secuence > 95% of 94.7% of nominal. Not_e_ _2 of nominal. No_te 2 nootnal(>57Hlz.
l 2nd pump start, min. freq.=57.8Hz.=
2nd pump start, min. freq.=56.3Hz.=93.8%
96.3% of nominal.
of nominal. Note 2 30 Voltage recovers to within 10%
Mst pump start, time voltage <90%
1st pump start, time voltage < 90%
of nominal within 60% of the of nominal = 1.92 secs. = 45.4%
e of nominal = 0.65 secs. = 14.2% of load secuency interval.
of load sequence interval of a load sequence interval of 4.58 secs.
Note 4 i
4.23 secs. Note 3 Note _3 V
2nd pump start, time voltage <90%
2nd pump start,ftime voltage < 90% of of nominal = 0.83 secs.
nominal = 0.63 secs. Note 3, e
O c
g g
1
~
d C
a o
^
l f*
ti 4
Ce Y
,=-
e n
s e.
Test ResultY for T8tResultsfor Position _ in_ C.6' of R.G._Yb Divisi_on 1, DG-0
';O y
D_ivision_2, DG-1A h
4 Frequency recovers to within 1stpumpst[rt, ime frea < 98%
lst pump start, time freq.< 98%
n 2% of nominal within 60%
of nominal = 2.76 secs. = 65.2%
of nominal = 3.78ssecs. = 82.5% of O
of the load sequence interval.
of load sequence interval of load sequence interval of 4.58 secs.
O No_te 4 4.23 secs.
=
\\'
2nd pump start, time frea.< 98% of 2nd pump start, time freq2< 98% of j
i d
nominal = 1.78 secs.
nominal = 2.59 secs.
I <]
A NOTES c
gg 1.
Voltage for the DG-0 first pump sta'rt was < 75% of nal fo w ly 0.52 secs.
Voltage for the DG-0 second pump start was < 75%
'inal f' r on)y 0.48 secs.
6 s
t 2.
Frequency for the DG-0 first pump start was < 95% of nominal (< 57Hz) for only 0.18 secs.
Frequency for the DG-1A first pump start was < 95% of nominal for only 0.83 secs.
v
~
o C
frequency for the DG-1A second pump start was < 95% of nomjnal for only.098, secs.
~
e 3.
Due to voltage overshoot on recpvery from pump starts, the rec 6very time'to 1 10% of nomin*al voltagevis greater'
^
time than to 90% of nominal for the following pumps starts:
s y
DG-0 first/ pump start otime to 1 10% of nominal is 2.33 secs. = 59.8% of load sequence interval.
a.
o
- b.. DG-1A first pump start, thne to 110% of nominal is 1.37 secs. = 29.9% of load sequence interval.
DG-1A second pump start, time to 1 10% of nominal is"1.44 secs.
(no. subsequent load sequence).%
c.
tb plly started' af ter the second ECCS pump is' started.
j 4.
No loads are automati v
3
[
t e
s s
i
(
b o
8 M
a
2 d
jy o
=
].
s
~
c.
O 9
t N
o g
<s*
Comments on Compliance with Reg. Guide.l.9, position C.%.
i
'A
/
~
'g 1.
Tne Diesg1 Generators have'given n'o dicationofinstabilityduring s
t or*irrability tobrecover from the transients caused by these pump starts.
~
s 5
w.s, 2.
The pumps nave"not given any evidence"of accelerhtion problems or s
e inability to attain full flow within the required time due to the tragsients.
.s
^
4 3.
No other loads have stopped, trip' ped, or failed in any other manner adu g the gCCS pump starting transients.
4 y
/
e
=
~
The voltage transient during.the worst case (DG-0 start'bf the LPCS 4.
' 6 pump) does not drop belof'the trip setp,oint of the undervoltage o<
re la,ys.
a, 5.
ThismeetstheintentofIEEE'Sth'. 387-1977 section 5.1.2.(5) and gg. Guide 1.91 s
jr l
v so+"
g
+
a
+
O s
s c
/
c q
p 0
x m.
3 e-EW s
V s
e o
e r
-r g
c g
~
S O
O e
gi
% b "O,
J
= _,
a
\\
, y, s_
+
~
l
?
Q' fi, i.V s
z Q
)
bs-c 4
1318L*
6
~
0
+'
g, 1 3 g
g 4
1 n
-