ML20039D625
| ML20039D625 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/30/1981 |
| From: | Mardis D FLORIDA POWER CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| 3F-1281-43, NUDOCS 8201050283 | |
| Download: ML20039D625 (3) | |
Text
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
m (O
2 HECEIVED 1
JAN 5 1982> r Cmuu tarmtone;m
\\
asaur emainc TE a
RO 88 Power C0mPOnaTeON December 30, 1981
- 3F-1281-43 File: 3-0-3-a-3 Mr. John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Adequacy of Station Electric Distribution System Voltage
Dear Mr. Stolz:
The revised copy of the Crystal River Unit 3 Electrical Distribution System Review Summary was submitted for your review by letter dated December 22, 1980.
Your evaluation determined that the Crystal River Unit 3 design was acceptable with respect to " Station Electrical Distribt. -f on System Voltages" subject to completion of tap changes on the startup transformer and verifi-cation of bus voltages.
Your April 22, 1981 letter requested this addi-tional information within 20 days after Crystal River Unit 3 restart follow-ing refueling.
Florida Power Corporation hereby provides the requested information.
Item 1 FPC must conduct tests to verify the voltage analysis.
These tests should be conducted with the Class 1E buses and MCC's loaded to at least 30%.
If this is not possible, FPC should define the basis used to accurately account for feeder and trar. former voltage drops in their measurements.
Response
Tests, using procedure PT-301 " Degraded Grid Voltage Measurements",
were conducted on September 25 and 26, 1981, to verify the voltage analysis.
The tests required Crystal River Unit 3 to be on-line and operating at a load such that safety related. 4160V and 480V buses are at or above 30% load.
The first series of voltage measurements required that a~l breakers were in the normal configuration, and all equipment was fed from normal sources.
The 6900V reactor auxiliary 8201050283 811230 OlI gDRADOCK 05000302
$ i)!O PDR
\\
General Office 32o1 Tnirty fourin street soutn. P O Box 14042. st Petersburg. Fionda 33733 e 813-866-5151 6
'Sfv 5s s
\\
Mr. John F. Stolz, Chief i' '
Page Two December 30, 1981 o
r buses 3A and 3B, the 4160V unit buses 3A and 3B, and Ihe 4160V ES buses 3A and 3B 'were fed from the Crystal River Unit 3 startup trarisformer.
O The second series of voltage measurements required the tr'ansfer'of the 4160V ES buses 3A and 3B to the Crystal River,Unitsf1l & 2~ startup
~
transformer. Also, a transfer from the Preferred Off-Site Power > Source to the Alternate Off-Site Source and return' to the Preferrel Gf f-Slte
\\
Power Source was required before taking the second ' set of measure-
+
ments.
The recorded data, measured by potentia; transfohmirs, for the tests are listed below.
' (M C
'CR3 Startva -
CQ42 Startup Transformer Soukce
- TransfoT%er Source BUS ANTICIPATED MEASURED GRID
- MEASURED GRID
- V0LTAGE VOLTAGE VOLTAGE VOLTAGE VOLTAGE '
-VAC VAC VAC VAq VAC A
-V 1.
6.9 KV Reactor 120 120.0 204.0 - 120.6 204.0 Aux Bus 3A
~. 4 2.
6.9 KV Reactor 120 120.1 204.0 120.6 204.U D if..
Aux Bus 3B 3.
4160V Unit 120 119.5 204.0 121.0
{04.0 Aux Bus 3A 4.
4160V Unit 120 119.5 204.0 121.0 204.0 _
Aux Bus 3B s -
5.
4160V ES Bus 3A I?O 119.5 204.0 121.6 204.0 A.
7 6.
4160V ES Bus 38 120 119.4 204.0 121.6 Zug.u
,,2 ~
r, s hJ4 319.9 204.0 7.
480V ES B :s 3A 120 118.0 '
, Q.0 y
? i,i 8.
480V ES Bus 3B 120 118.7-304.0 120.7 204.0 9.
MCC ES-3Al 480 469.0 204.0 478.0 204.0 O
/,
480 471.0 204.0 480.0 204.0
- The anticipated potential transformer voltage readings for the 230 KV grid were l
208 VAC..
p k
..f A
g
...,,_..-_..._.,_,,_.,,...,,.,,_,.,,-.,o,..-,.-.-.,
...._,,._,.,.,-..,...,,. i-._.,
N JE w>
' e s
.s r
'L d
C s
,s.
Mr. John F. Stolz, Chief Page Three December 30,,19.81 '
s Item 2 Upon completion of tap ' changes on Unit 3 startup transformer and veri-
~
fication testing (Iteo 1 above), the Class 1E equipment terminal volt-age will remain within acceptable operating limits for the postulated worst case.. conditions.
~
' R'esponse s
The-tap [etting change from 224,240V to 230,000V on the Crystal River s
Unit 3 :,tgrtup-transformer was completed on November 27, 1981.
Should you have any nuestions concerning this matter, please contact this office.
2, Very truly yours',
x
-s UY M
,' David G. Mardiss.
Acting Mandger '
Nuclear i.icensir.g ' -
' s-
'7 -.-
s g
Kicin(T01)D3-2 e
Ate A
't.
/
%l N
j M
a och g
- if Us, t,
i I
g9 s.
s N '
t.,
~
.w
- L* ~ #%
q y
f a
[( '
N
'Nw N.
c
>s a
.y ' ;
4.
'N '-
,, N N%
I r,'
lw,
. v t
's
,' \\
g' w
1
]'-w e=-.'
s g+
g
=
\\,
(
9
\\ ',,,
\\1 A
s y l >,,.
J
~
~
+
s i
\\
Ks 9}.
T
,