ML20204C192
| ML20204C192 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 03/09/1987 |
| From: | Gucwa L GEORGIA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| SL-2110, NUDOCS 8703250244 | |
| Download: ML20204C192 (11) | |
Text
Gec:gim Fewer Company 333 Piedmont Avenus Ati:nta, Georgia 3030b Telephons 404 526-6526 Mailing Address:
Fest Office Box 4545 Atlanta, Georgia 30302 Georgia Power L T. Gucwa tre sdem eiectrc system Manager Nuclear Safety and Ucensing SL-2110 0142m March 9,1987 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 NP,C DOCKET NUMBER 50-424 NRC OPERATING LICENSE NPF-61 V0GTLE ELECTRIC GENERATING PLANT UNIT 1 REPORT OF TEST RESULTS RELATED TO ELECTRICAL DISTRIBUTION SYSTEM VOLTAGE ANALYSIS Gentlemen:
4 Georgia Power Company hereby submits a verification of test results of electrical distribution system vol tage analysis pursuant to confirmatory item 30 of supplement 5 to the Plant Vogtle " Safety Evaluation Report".
Should you have questions regarding this submittal, please contact this office.
Sincerely,
.h.
L. T. Gucwa WEB /1m Enclosure 0
8703250244 870309 i
i PDR ADOCK 05000424 P
~
e GeorgiaPowerA U. S. Nuclear Regulatory Commission March 9,1987 Page Two c: Geors f a Power Company Mr. L. E. Conway Mr. J. P. O'Reilly Mr. G. Bockhold, Jr.
Mr. J. F. D' Amico GO-NORMS Southern Company Services Mr. J. A. Bailey Shaw, Pittman, Potts and Trowbridge Mr. B. W. Churchill, Attorney-at-Law Troutman, Sanders, Lockerman & Ashmore Mr. J. E. Joiner, Attorney-at-Law U. S. Nuclear Regulatory Commission Dr. J. N. Grace, Regional Administrator Mr. H. H. Livermore, Senior Resident Inspector-Construction, Vogtle Ms. M. A. Miller, Licensing Project Manager, NRR (2 copies)
Mr. J. F. Rogge, Senior Resident Inspector-0perations, Vogtle Georgians Against Nuclear Energy Mr. D. Feig Ms. C. Stangler 0142m 700775
7 f1AP-09 '87 09:52 T-EECHTEL LA
- 259-02 Vogtle Electric Generating Plant Branch Techn~ical Position PSB-1 Voltage Verification Test Results As required by Branch Technical Position (BTP) PSB-1, section B.4, the project has completed a voltage verification test to confirm the adequacy of the mathematical model used for analyzing plant auxiliary power system voltages under various plant operating conditions.
The project committed to this effort in the response to FSAR question 430.68.
This section of the BTP requires that actual measurements of bus voltages and loads be performed under _ the following conditions:
A.
Safety related busses down to the 120 volt level are lot ded to a minimum of 39 percent.
B.
The axisting grid and safety related bus voltages and bus loads be recorded during steady state conditions and during transient conditions with the non-concurrent starting of a large class lE motor and a large non-class 1E motor.
C.
A new set of bus voltages be calculated for the voltage and load conditions measured in B above.
D.
The measured and calculated voltages be compared.
The mathematical model will have been verified if good correlation exists between the measured values and the calculated values and if the actual voltages measured are not lower than 3% below the calculated values.
Voltage analyses have been performed using computer modeling techniques that studied various plant operating conditions as required by section B.3 of BTP PSB-1.
These analyses have determined available steady state bus voltages under heavily loaded conditions coincident with the switchyard at minimum anticipated voltage.
Steady state light load conditions during plant shutdown and normal operating conditions were evaluated coincident with the switchyard at maximum anticipated voltage.
Transient loading conditions (e.g. during automa tic load sequencing) were evaluated to confirm that adequate voltage was available to ensure the proper starting of motor loads.
The degraded voltage trip setpoint was also established in these voltage analyses.
Verification of the mathematical model substantiates the validity of these other analyses.
n.
mR-ps *87 09:53 T-EECHTEL LA
- 259-03 I
The voltage verification test program was established in accordance with the requirements of BTP PSB-1, section B.4.
Minimum required bus loads of at least thirty percent of the steady state bus loads evaluated in the original voltage analysis were determined and provided to the nuclear operations depa r tmen t.
Note: In lieu of calculating 30 percent load values for the 120 volt busses in the safety related motor control centers, it was concluded that maximum load on the panel would be achieved by closing all non-spare circuit breakers on these busses.
Voltage regulated 120 volt busses such as those powered f rom inverters and regulating transformers were excluded from this test program.
Separate tests were performed on train A and Train B.
Prior to the initiation of the test, busses were loaded to a level equal to or greater than the minimum required values.
Steady state voltages and currents at the necessary busses were recorded.
As soon as practical, the motors selected for the transient start tests were energised, first by starting a class 1E auxiliary feedwater pump (900 hp) followed by (within a short period of time and af ter steady state conditions were again reached) a turbine plant cooling water pump motor (1500 hp) for the train A test and a river water make-up pump motor (1500 hp) for the train B test.
Transient voltages during these motor starts were monitored on the string of safety related busses that were found to have the lowest voltage during the voltage analysis described a bove (busses 1AA02, 1AB05, 1ABA, 1AYA1 and IBA03, 19507, 1BBA, 18YA1).
The measured values were then analyzed using the same mathematical model used during the original voltage analysis.
The test and analysis results are provided in attachment A and a simplified one line diagram for the associated busses is provided in attachment B.
As indicated in attachment A, good correlation exists between the measured values and the calculated values for the steady state portion of the test program for both trains.
The dif ferences between the values range from a minimum of -0.1 difference on busses 1ABE and IBYF1, to a maximum of +2.6 percent i
on busses 1BB16 and 188D.
The worst case measured steady state i
voltage that is lower than calculated values is -1.0 percent on s_.
bus IAYD1.
Therefore, the comparison of the measured and j
calculated steady state values is acceptable per the criteria in BTP PSB-1.
l For the transient voltage conditions, the measured values differed from calculated values by a minimum of -0.2 percent on j
busses 1BA03 and IBYA1 and a maximum of ~2.7 percent on bus 1 ABA.
l
V MAR,09 '87 09:54 T-BECHTEL LA s258-04 This value is also the worst case measured transient voltage that is lower than calculated values.
This data shows good correlation between the measured and calculated values and the comparison of the measured and calculated transient values, is acceptable per the criteria in BTP PSB-1.
On the basis of the results for the steady state and transient conditions, the mathematical model used in the voltage analyses is considered to have been verified as being acceptable and that the original analyses satisfactorily predict plant distribution system conditions under the various operating modes that were analyzed.
The dif ference be tween the calculated voltage and measured values for both steady state and transient conditions when subtracted f rom the voltage levels detailed in the original analyses is never less than the Class 1E equipment rated voltages.
Those measured values that are lower than the calculated values are considered to result from errors introduced during the site measurements as well as limitations in the computer program that cannot account for voltage and current imbalances that were found in the actual measurements.
To some degree, these voltage and current imbalances were caused by single phase loads (e. g.
lighting and/or 129 volt panel transformers) whose effect become more pronounced at the relatively light loads present at the 30 percent load level.
-~
n.
MAR,09 '87 09:53 T-BECHTEL LA c258-05 Attachment A Page 1 of 4 BRANCH TECHNICAL POSITION PSB-1 VOLTAGE VERIFICATION TEST TEST AND ANALYSIS RESULTS TRAIN A BUS MEASURED VOLTAGES CALCULATED VOLTAGES DELTA NUMBER (VOLTS) Note 3 (VOLTS)
(4)
Note 1 STEADY TRANSIENT STEADY TRANSIENT STATE 1E NON-1E STATE 1E NON-1E 239kV_ Switchyard (Voltages are in kV) 233 235 235 233 235 235 0.0 Note 2 4.16kV Switchgear 1AA02 4898 4083
+0.4 3994 4020
-0.7 3862 3902
-1.0 480V load Centers IAse4 475 477
-0.4 1A805 480 481
-0.1 463 473
-2.1 451 459
-1.7 1AB15 481 475
+1.2 Notes [
- 1. The " DELTA" valuen were determined in accordance with the following formula:
MEASURED VOLTS - CALCULATED VOLTS X 100 DELTA =
CALCULATED VOLTS
- 2. The measured values for the switchyard voltage were used as the " reference bus" for the voltage analysis for each of the tests.
I
- 3. The measured voltages indicated are average phase-to-phase voltages.
Where imbalanced phase currents were measured, an average of the three phase currents was used for loading purposes.
MAR-09 '87 09:95 T-BECHTEL LA
- 259-06 Attachment A Page 2 of 4 BUS MEASURED VOLTAGES CALCULATED VOLTAGES DELTA NUM8ER (VOLTS) Note 3 (VOLTS)
(8)
Note 1 STEADY TRANSIENT STEADY TRANSIENT STATE lE NON-1E STATE 1E MON-1E TRAIN A (Continued) 488V Motor Control Centers 1ABA 480 480
+0.1 459.5 472
-2.7 446 458
-2.6 1ABB 479 474
+1.8 1ABC 481 480
+0.1 1ABD 474 475
-0.2 1ABE 476 476
-0.1 1ABF 479 480
-0.2 128V Panels IAYA1 119 119.9
-0.7 114.9 117.8
-2.5 111.5 114.3
-2.4 1AYB1 117.5 118.5
-0.9 1AYC1 118 118.5
-0.4 1AYD1 117.5 118.7
-1.8 1AYE1 This is a regulated panel and is therefore excluded.
l 1 AY P1 119.5 118.9
+0.4 1
i i
i
MAR-09 '67 09:56 T-BECHTEL LA
(:258-07 Attachment A Page 3 of 4 TRAIN 8 BUS MEASURED VOLTAGES CALCULATED VOLTAGES DELTA NUMBER (VOLTS) Note 3 (VOLTS)
(t)
Note 1 STEADY TRANSIENT STEADY TRANSIENT STATE 1E NON-1E STATE 1E NON-1E 230kV Switchyard (Voltages are in kv).
231 233 238 231 233 238 0.0 Note 2 4.16kV Switchgear 1BA03 4117 4034
+2.1 3938 3935
+0.1 3806 3815
-0.2
_4_80V load Centers 18B06 479 471
+1.7 18807 481 475
+1.3 461 463
-0.4 451 449
+0.4 18B16 481 469
+2.6 l
l i
-e
,-.,_..-._--,-,.....,_.n_.
a.
MAR-09 '87 09:57 T-BECHTEL LA 0258-08 Attachment A Page 4 of 4 BUS MEASURED VOLTAGES CALCULATED VOLTAGES DELTA NUMBER (VOLTS) Note 3 (VOLTS)
(t)
Note 1 STEADY TRANSIENT STEADY TRANSIENT STATE 1E MON-1E STATE 1E MON-1E TRAIN 8 (Continued) 489V Motor Con _ trol Centers 1BBA 485 474
+2.3 456 463
-1.5 446 448
-B.4 1888 488 469
+2.3 1BBC 483 475
+1.7 1BBD 480 468
+2.6 1BBE 479 470
+1.9 1BBF 484 475
+1.9 129V Panela 18YA1 118.5 118.2
+0.3 113.9 115.3
-1.2 111.5 111.7
-0.2 18YB1 119.0 116.6
+2.1 18YC1 This is a regulated panel and is therefore excluded.
15YD1 119.1 116.8
+2.0 18YE1 116.0 115.5
+0.4 18YF1 118.5 118.6
-0.1
o.
Attachment B Page 1 of 2 2NAl 13 W1 R. k...
- / -
0 Mi e %
440. pN Ay) itA'T inni
.t_1_1__H__J
/N4 f #
(T T1 h %
c M
- '8"r,O,r.,,
o.ne f
_ / Hee) st W l)._.
g
. IT T1 a 4,is WA.
-#f 0.94 P F
.'fy
.. I N A
- r 3 l' 4 0 W V.... ' "....
4*lW
'AA*1 6
.g
+.m ars v
-..... o. sin rF
.. see 3 ' h * "'.'
re o,M ts.
,o 71,.,f Olh '
4
............ + -.....
......... r. nn 1._
to 1/
/NAot 4,f6%
ty
.UN..
U S..
?
lAgtt* W th O =N s
19.
tok I
l p --
V k4 M4k A h5 He I
s c
,yo, n4Wuh e
n 4
og o.,<
is w
o,n v e
/*3/4 MJ jess _/6
/AJF 8 8N #
/A
/A
... " 4 fl.
4el 60siso$
m 1>
l pggg-OsM4fF e,n
/440 MA
~~
,pygy
/A1FI
,. ? h tA
'/ h no tre MYA
. d.4 4 // D
-6 nAA ff e.m1 AMA
/MS
/ A l
g
/A1()! 0,e s9 1* vh
/AYtt Di44 # b 4 941MVA l
lMN 0.9% N' c
r a.'*
t1AR-09 'B7 09:58 T-BECHTEL LA C250-10 Page 2 of 2 6WO I
IWalt.
49 1960 16 L
ss M
v es l* *^*
- U g o 189 M%
A0MMVA h4D mm Aqn gp a gt? ff
+
Igs-liTot.
ideio aA
+8av v,
aw o,pr6 mvA
'Y m
~
q ggg3 pp
'4t6Ey isAos 4.t 6 V V G
IdAo4 3-V 11
\\/
1 1,(,4% Mvh S.For x4
. aAss fe ao 8 894PF p
tr m 01 n uvA IB 506-4BoV l '2.
o,4tgep.
v I
o.StdMVA
,ggg g3 6 9t1 tF
~
4 LQ V
us -
pioat1xvA wR
.%D o.s\\n 99 rrm tYm
)ST&l I Asi6
+soV -14 15 l5807 4 60 V q
ai 4 s s M V A.
,,, [, p V
- '
- 1 ' Y OAn t Tr-16 (BAD lfo 1565_
7 inBA I Ogc, g
gmap 2)
- "*** N 8,81 MAM b s 0,0 EkvA vs
's e s,,,,.d',,,V,.,,,, T.o.o se s"^ T '. 9n es 0 9t >vs
.an ev.
,