ML20084G590
| ML20084G590 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 04/18/1984 |
| From: | Crouse R TOLEDO EDISON CO. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 1046, TAC-517, TAC-51738, NUDOCS 8405070284 | |
| Download: ML20084G590 (2) | |
Text
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i Docket No. 50-346
^
Totsoo EDISON License No. NPF-3 RCHAHO P. Cnoust Serial No. 1046 vc, %
uw April 18, 1934 Directgr of Nuclear Reactor Regulation Attention:
Mr. John F.,Stoh Operating Reactor Branch No. 4 Division of Operating Reactors United States Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. St'ol'A:
This letter is in response to 'a virbal request f rom Mr. A. W. DeAgazio for additional 2nCormation concerning Adequacy of Teac Results - Degraded Voltage Study for Davis-Besse Nuclear Power Station Unit No. 1.
Attached is a revised table for tiie Degraded Grid Voltage Test - Voltage Analysis Tabulation outmitted January 23, 1984 (Serial No. 1022).
The difference between the test and the analytical results as shown in the original table submitted January 23, 1984, depict the conservatism used in the analysis. The analytical voltage is determined using the previous bus voltage. This process is done in series through the buses, and the result is that voltage conservatisms are compounded. This always insurers that the test results are in the conservative direction.
The revised table cepicts the aralytical values and the differences for the buses C1, C2, El, and YEl, after compensating for the conservatism of the computer program. To obtain these values, the analytical bus voltages were multiplied by the ratio of test to analytical voltage values of the upstream bus. The differences have also been revised accordingly.
In addition, we have since detarnined that ' he transformer supplying bus t
YEl, is a universal type with a ratjo of 460V/12GV vs. 480V/120V which was previously used in the analysis. The analytical values for bus YEl, has been corrected by a ratio of 460/460.
The revised table indicates that there is an excellent correlation between the test and the analytical values.
Very truly yours,
((
RPC: GAB:1ah attachment cc: DB-1 MRC Resident Inspector,
THE TOLIDO EDISON COMPANY.
ED' SON PLMA 300 MADISON AVENUE TOLEDO, OHIO 43052 84050702s4 840418 f#
F-I 4
4 e
DECRADfD CEID VOLTACE Tr$7 WOLTACE ANALYSIS TAStLAT10K STEAUT STATE woLTAGE v4L'T5 TRANSTENT WotTACE VAlmES Sc5 TEST AhALYTICAL
TEST ANALYTICAL DIFFEREhCE TEST ANALYTICAL DIFFEREM.E
'J' 362 342
- 0 M2 M2 0
M2 342 0
. (M5ET)
' A' 14 13.67 2.41
- 12.5 12.17 2.7%
13.9 13.20 5.21 (13. 8ET)
AbovE ABOVE A80VE C1 A.25 4.28
.71 3.81 3.81 02 3.9 4.03 3.21 (4.16ET) -
3 Elans 3ELOW C2 4.28
.4.25
.75 3.84 3.81
.8%
4.0 3.9 2.6%
(4.14ET)
AgneE Aeovt A30VE
' El 485
' 442
.6%
445 429.4 3.6%
457 447.5 2.12 (480)
AgovE A30VE ABOVE TE!
128.1 125.98 1.75 115.6 115.5 01 120.6 118.6 1.71 (129v)
ABOWE AbOVE
- DI N
- W WA a100
- VOLTAGE VALDE. AEALYTICAL 11 4
- mevised 3/30/84 L