ML20003G444
| ML20003G444 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 04/24/1981 |
| From: | Janecek R COMMONWEALTH EDISON CO. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| 2547B, NUDOCS 8104290450 | |
| Download: ML20003G444 (3) | |
Text
/D Commonwealth Edison
~~
/
~
) One First National Plaza Chicago, Ithnois
( O h Address R ply to: Post Olhce Box 767 j Chicago Ilknois 60690 d' g <
IM April 24, 1981 8
j AJ)Ry,b
-1 2 %
g, g
gg Mr. T. A.
Ippolito, Chief
=
Operating Reactors - Branch 2 9
Division of Operating Reactors e
U.S. Nuclear Regulatory Commission 4
Washington, DC 20555
Subject:
Quad Cities 1 and 2 Adequacy of Station Electric Distribution System Voltages NRC Docket Nos. 50-254/265 Reference (a):
R. F. Janecek letter to D. G. Eisenhut dated August 18, 1980
Dear Mr. Ippolito:
In a telecon on March 25, 1981, the NRC Staff expressed a concern that the voltage levels at Quad Cities when Transformer 12 is carrying the Unit 1 shutdown load and the Unit 2 Essential Service Features load through the bustie between Units 1 and 2 were marginal.
I The original voltage levels for this system condition were submitted to the NRC in Reference (a).
The original voltage levels shown on Attachment 3 in Reference (a) were based (as directed by the NRC Staff) on maximum loading on Transformer 12.
l Enclosed is a revised table dated April 9,
1981 showing the Quad Cities auxiliary power bus voltages when Unit 1 Reserve Auxiliary Transformer 12 is carrying the Unit I shutdown load and the Unit 2 Essential Service Features load through the intertie between Units 1 and 2.
i The oifference between this calculation and the one' l
submitted ir. Reference (a) is that the shutdown load is a realistic load assuming no manual operations to aisconnect load after a unit trip.
The voltages at the 460 volt motor terminals were l
calculated using actual motor feeder impedances.
A combination of the largest motor size and longest teeder length on each bus was selected for maximum voltage drop at the load.
8104290 /50 4
/
T-W e_
O'
_2 The results indicate that 'tlie running voltage at al'1 4000 volt and 460 volt motors is above 92% of motor rated voltages.
Please address any additional questions concerning_this matter to this office.
One:(1) signed original and thirty-nine:(39) copies of this transmittal are provided for your use.
Very truly yours, is
[f.l,_-:/ re.
'i Robert F.:Janecek
' Nuclear Licensing Administrator Boiling Water. Reactors cc:
RIII Inspector, Quad Cities 25478 i'
i i-I f
i e
i i
I i
i t
l
_ - _ _,, ~...
g yg l
{
RAT (TR.#121 CARRYING UNM SHUTDOWN 14AD l
Pl.US UNIT 2 ESF 1,OAD WRU INTER. UNIT TIE i
SCC = 5195 HVA (Minimum) l Volt rangs*333 to 354 kV Revised 4/9/81
- g 14% kV Syst m i
Full Load No-lead i
336.375-4.16-4.16 kV i
H-X = 15.51 {g 333 354 H~I " I
27.6 HVA 96.5 102.6 X-Y
- 30.4%
4
{
Syst. Volt Z of 345 kV t
n MM i
en en 0.000{ 3g 4 x
+
%s Volt 3927 Bus Volt NO9
' ~
,1 of 4160V 94.4
% of 4160V V Bus 11 +
2 0.000236 +
Equip. Volt 3907 j0.0023810 Equip. V It 1 of 40C07 97.6 23.7 HVA 7
% of 40007 e 0.92 PF 3us Volt 3919 4160V Bus 13 + 14
- Bus Volt kof4160V i: of 4160V 94.2 cm
~
iEquip. Volt 3899 Oc.007866 +
0.009505 +
ille.3 MVA tEquip. Volt t: of 4000v 97.4 j0.0192540 j0.0232670 0 0.95 PF f: of 4000V I
e
' Bus Volt 3914 d
4160V Bus 11-1
' Bus Volt I of 4160V 94.1
% of 4160V Equip. Volt 3894 80 kVAlf Iquip. Volt I of 400mr 97.3 g o,3 pp 2 of 4000V I
I s"* v I" 5us Volt 3902 4160V Bus 14-1 84 Tet
'1 of 4160V 2 of 4160V 93.8 8 sT *'" Equip. Volt
' Equip. Volt 3882 40 kVA 'I
.0042 +
2 of 4000V 97
@ 0.87 PF j0.00744Q ud'.75 882 :Z of 4000v r--- ---------)-----i y Bus Volt 3002 LJ 4055-480V l4160V Bus 24-1
. Bus Volt Ah t of 4160V 93.3 M
' t of 4160V X = 121 @
, Equip. Volt Equip. Volt 3882 1500 kVA
{ --@-0.88 PF Q 2 of 4000V 97
-ll:gy q.
- ,y og 40ooy L J 4055-480V e
e C7 X - 11.4% e e
Q Sus Volt 440 1500 kvA l
l Bus Volt I of 480V 91.7 480V Bus 18 y
e e
1 of 480V y
Equip. Volt 424 4055-480V 8
qj Equip. Volt l
I - 11.33 g's 2 of 460V 92.3 985 kVA $
@ l of 460V pg q
4055-480V gJ 0.85 PF l
1500 kVA Bus volt 445 g, 31 gg ge m 480V Bus 19 Bus Vott C of 480V 92.8 e
' t of 480V 1500 kVA Equip. Volt 435 760 kVA 9 1P l
l Equip. Volt l"""
C of 460V 94.5 0.iQ PF l
E of 460V kg Volt 445 480V Bus 29 Bus Volt
- of 480V 02.8 pg{e e
1 of 480V k'ok'l.6 750 kVA elf l
[qugpl.60V
- 9
,g g p ro teso s
0.85 PF
"I"
~~~~~~~~~~~~~~~'
Bus Volt 448 Bus Volt u s.r I of 480V D3.4 480V Bus 17
. I of 480V Equip. Volt 439 735 Equip. Volt KVA- 'g t of 460V a t of 460V 95 4
.85 P.F.
u