ML20099B414
| ML20099B414 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 07/23/1992 |
| From: | Link B WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-92-079, CON-NRC-92-79 TAC-M68586, TAC-M68587, VPNPD-92-257, NUDOCS 9207310137 | |
| Download: ML20099B414 (12) | |
Text
. _ _..
l l
Wisconsin lihactrn:
PONER COVPNH w w u mp to M, se.: t ww+ mwt whiN VPNPD-92-257 10 CFR 50.63 NRC-92-079 July 23, 1992 U.
S.
NUCLEAR REGULATORY COMMISSION Document Control Desk Mail Station P1-137 Washington, D.
C.
20555 Gentlemen:
DOCKETS 50-266 AND 50-301 SUPPLEMENT TO 10 CFR 50.63.
TACs 68586 AND 68587 LOSS OF ALL ALTERNATING CURRENT PQEB POINT BEACH NUCLEAR PLANTS. UNITS 1 AND 2 In a letter dated October 3, 1990, the NRC transmitted the Safety Evalua*. ion Report (SER) issued by the Nuclear Regulatory Commission Office of Nuclear Reactor Regulation for the Point Beach Nuclear Plant (PBNP) response to the Station Blackout Rule, 10 CFR 50.63.
In that SER, the NRC made the following recommendation for using the PBNP gas turbine generator (GTG) as an alternate AC power source:
"The licensee should demonstrate using actual test data that the GTG can obtain and maintain a reliability of 0.95 or better.
This demonstration should be completed within a reasonable time period (approximately 2 years)."
In a letter dated November 8, 1990, we committed to demonstrate the achievability of 95% reliability of the GTG within two years.
On June 25, 1992, Wisconsin Electric staff members met with personnel from the NRC staff to discuss the status of the GTG for Station Blackout Rule compliance.
Attached is a status update which summarizes the information discussed and presented at this meeting.
Our efforts to demonstrate and improve the reliability of the GTG include testing, troubleshooting, and modifications.
The attachment describes some of the details of our efforts to demonstrate and improve the reliability of the GTG since 1989.
The attachment to this letter also provides reliability test data bR73go g6
[
[
0 0
.4 submfupf Hiwnsin Dnp Ovpwkn
4 NRC Document Control Desk July 23, 19(e 3 Page 2 results for GTG from June 15, 1990, through March 18, 1992.
As discussei
_.h the NRC staff during our meeting on June 25, 1992, we be eve the test data results demonstrate that the GTG can obtain 5% reliability.
We will be implementing a
,6116 ' 'ty program t';.at will be used to continue to irprove, mainte and monitor the reliability of the GTG.
The reliabil ty program ir being based on guidance from RG 1.155 for EDG reliability programs.
The reliability program provides 'he method for maintaining 95% reliability our continuing efforts to iwprove and mainta n the
.et.
the GTG, we are currently performing a n-jor evex
) grade of the GTG.
Ine overhaul and upgrLde are completed by October 1992.
The attachment to this E
ehpc
(.
a let' ar pc ev 3 a description of the overhau' and upgrade.
The attachmes
_eo contains a plan for how we intend to tuat the GTG to cum +
.isn the achievability of 9f% reliability after the overL..
propose that completion of twenty tests with two or fewer fa i '
re-establishes the achievability of 95%
reliability 4ter the overhaul.
This is considered "reasonaole "g
'dence* thac the geliabilicy has not degraded below the target as rtated in the proposed Revision 3 to Regulatory Guide f
nave estimated that this testing will be completeu
.pproximately thirty weeks following the completion of the
_ul
',1.e.,
about May 1993).
While the GTG is out of service for the major overhaul and upgrade, a diesel generator has been installed temporarily to t
provide power t o the Appendix R alternate shutdown system.
The procedures for Appr.U'x fire scenarios and loss of all AC power r
have been mndified
.a n the temporary diesel generator (TDG) while the Cn, is not evallable.
A descripticn of the TDG and its capabilitive for mitigat.4.ng a ctation blackout are provided in the attachment to tti s letter.
4 We believe the goal to complete twenty tests with two or fe'ar failures within thirty weeks is achievable.
The extensive overhaul and upgrade outage is the main reason for our requesting this time to pelform the redemonstration of the echievability of 95% reliability of the GTG.
We expect to complete this redemonstration by May 1993.
The TDG will be maintained as a compensatory measure until the twenty tests with two or fewer failures ale completed or some other licensing action allows it-removal.
Implementation schedule requ'rements for alternate AC power sc'Irces are defined in 10 CFR 50.63 (c) (4).
This provision requires licensees to submit a schedule for implementing any
NRC Document Control Desk Jul'j 23, 1992 Page 3 i
associated procedure modifications necessary to meet the requirements of the Station Blackout Rule.
Our schedulo g
commitment was provided in our. letter dated November 8,-1990.
In that letter, we committed to demonstrate the achievability of 0.95 reliability of the GTG within two years.
We believe the l
data provided in this letter satisfy this commitment.
l The major overhaul and upgrade of the gas turbine are expected to-i improve the reliability.
We are proposing to redemonstrate-the GTG reliability after the overhaul by May 1993 by complcting twenty countable starts and load-runs with two or fewer failures.
)
If we cannot redemonstrate the reliability, we wf submit j
additional information about how we_ propose to meo che j
requirements of 10 CFR 50.63.
We request-that tne NRC staff review and approve this proposal as an acceptable plan and schedule for continued compliance with the Station Blackout Rule at Point Beach Nuclear Plant, i
Sincerely, N
%. / l } <;
i u
i Bob Link L
Vice President Nuclear Power Attachment Copies to NRC Regional Administrator, Region III NRC Resident Inspector 8
3 I
i 1
5
4 4
4 STATUS UPDATE FOR STATION BLACKOUT RULE IMPLEMENTATION POINT BEACH NUCLEAR PLANT UNITS 1 AND 2 I
i GAS TURJ1NE RELI ABILITY In our initial station blackout submittal to the NRC in April 1989, we stated that PBNP would rely on alternate AC power from the gas turbine that exists at the site.
At that time, the reliability of the gas turbine was reported to be about 0.93.
We also stated that additional testing and maintenance requirements would be implemented to inprove the gas turbine's reliability.
In July 1989, we began testing the gas turbine in a mode similar to the way it would be started during a station blackout.
The gas turbine has an auxiliary power diesel generater that starts 3
automatically when power to the gas turbine is lost.
The new e
mode of testing includes securing power to the gas
- mbine, allowing the auxiliary power diesel to start, then L rting and running the gas turbine with its support systems powered by the auxiliary power diesel.
During these initial tests, the auxiliary power diesel failed several times by tripping on high temperature.
This failure causes the gas turbine to trip dua to the loss of its support systems.
A main problem causing the high temperature trip was believed to be inadequate ventilation near the auxiliary power diesel.
A modification to the gas turbine building ventilation was completed in June 1990.
After the ventilation modification was completed, another test was attemptcd.
The test failed due to the auxiliary power diesel trip on high temperature.
The auxiliary power diesel high temperature trip circuit was recalibrated, and the netpoint was i
raised.
The technical manual for the auxiliary power diesel allows the highar setpoint.
The gas turbine was ter.ced after the recclibration cf the high temperature trip on the auxiliary power diesel.
The test was successful, but the maximum outside ambient air temperature that day was only 55*F.
Another test was performed during warme. waather.
This test failed due to the auxiliary power diesel high temperature trip, d
In June 1990, we started to perform monthly station blackout tests.
(The attached Gas Turbine G-05 Start and Load Reliability database starts at that time.)
The failure of the auxiliary
~
power diesel during a 'ong duration test during hot weather was not yet resolved, but the problem had been minimized to the extent that the gas turbine could be run for at least eight hours 4
during cool weather and about four hours during hot weather.
Long duration testing was suspended until the auxiliary power diesel high temperature trip problem could be resolved.
1
--g--pw,,
y 7
y r
y,-
9-p y
+mwyy,9vy---
e yP
2 I
Status Update Page 2 i
After further study, it was determined that the tenperature sensor and the tr.ip circuitry should be upgraded.
In March 1991,
[
a change to the high temperature trip circuit for the auxiliary power diesel was completed.
On July 18, 1991, an eight-hour test-was completed.
The maximum outside ambient air temperature was
~86*F.
This test confirmed that the auxiliary-power diesel high temperature trip problem had been resolved.
I In July 1991, a gas turbine reliability team was formed.
In the last quarter of 1991, problems with the starting circuits for the starting diesel and the auxiliary _ power diesel were corrected.
Also, the station blackout QA program was finalized and applied 3
l to the gas turbine and other station blackout equipment.
1 A GTG reliability database hos been developed based on the methodology in NSAC-108, "The Reliability of Emergency Diesel' 3
Generators at U.S.
Nuclear Power Plants."
A copy.of the database and graphs of the cumulative and sliding-10 is also in this attachment.
The sliding-10 data are a calculation of the GTG reliability from the 10 start attempts and the 10 load attempts that include and precede that test.
The sliding-10 is being used
~
as a method to monitor the rapidly changing reliability.
The guidance documents for 10 CFR 50.63 (NUMARC 87-00 and Reg Guide 1.155) do not provide guidance on how to select a target reliability for Alternate AC power sources.
Section 3.3.5 of Reg Guide 1.155 recommends 95% reliability for Alternate AC power sources.
l Reg Guide 1.155 does provide some guidance on the selection of a target reliability for Emergency Diesel Generators (EDG).
Section 1.1 of Regulatory Guide 1.155 uses samples of 20, 50, and 100 demands for selection of EDG target reliability.
The 20, 50, i
and 100 demand reliability for the GTG as calculated from'the GTG reliability datr5ase is:
1 Las_t 20 Demands Starting 20/20 z
100%
Loading 20/20 _
=
100%
Total 100%
100% =
100%
+
Last 50 Demands (insufficient loading data) p Starting 40/50
=
80%.
Loading 42/46-u.
91%
Total 80%--
91% =
73%
i 4
e w
rv
<-t-e:-,
i-e r
S e
w v---s -rw--
w o-we,
,----<'r
-r--
Status Update Page 3 f
Last 100 Demands (insufficient starting and loading data) i Starting 56/71
=
79%
Loading 42/46
=
91%
91% =
72%
Total 79%
+
The criteria given for evaluating EDG reliability are provided in
]
They are:
Last 20 demands >-0.90 reliability Last 50 demands > 0.94 reliability l
Last 100 demands > 0.95 rc: liability I
Reg Guide 1.155 also states that, if any of these reliability criteria are met, the nuclear unit may select an EDG reliability target of either 0.95 or 0.975 for determining the applicable coping duration.
This information, combined with the recommendation for 95% reliability for an AAC power source, indicates that selection of 95%-target reliability for the GTG is reasonable.
l The 100% reliability for the last twenty start and load demands demonstrates that the 95% reliability target is achievable.
A reliability program based on the target reliability of 95% is l
being developed for continuing to improve, maintain, and monitor GTG reliability.
1 i
1
(
l a
i
-,n, y_,..
n r,
a er..~n,--,,ev-a
.- ~
.\\
1 i
Gas Turbine G-05 Start and Load Reliability Database Ctsnut at ive Stidino - 10 Date START PHASE LOAD PHASE START LOAD TOTAL START LOAD TOTAL I
of Test Attemts success Attem ts success Reti Reti Reti Reti Reti Reti Coments 06/15/90 1
0 0
0 0.00 0.00 0.00 0.00 0.00 0.00 G-501 did not start 06/15/90 2
1 1
1 0.50 1.00 0.50 0.50 1.00 0.56 07/25/90.
3 2
2 1
0.67 0.50 0.33 0.67 0.50 0.33 Loss of G-501 08/14/90 4
3 3
1 0.75 0.33 0.25 0.75 0.33 0.25 Loss of G-501
'08/27/90 5
3 3
1 0.60 0.33 0.20 0.60 0.33 0.20 Fuel and Sequence Failure
- 08/27/90 6
-4 4
'2 0.67 0.50 0.S3 0.67 0.50 0.33 09/04/90 7
5 5'
3 0.71-0.60 0.43 0.71 0.60 0.43 4
09/06/90 8
6 6
4 0.75 0.67 0.50 0.75 0.67 0.50 09/18/90 9
7 7
5 0.78 0.71 0.56 0.78 0.71 0.56 10/24/90 10 8
8 6
0.80 0.75 0.60 0.80 0.75 0.60 11/29/90 11 9
9 6
0.82 0.67 0.55 0.90 0.67 0.55 Loss of G-501
[
12/19/90 12 10 10 7
0.83 0.70 0.58 0.90 0.70 0.63 1
01/18/91 13 11 11 8
c.85 0.73 0.62 0.90 0.70
'J.63
.l 02/25/91 14 12 12 9
0.86 0.75 0.64 0.90 0.80
- 0. 72 r
4 02/28/91 15 12 12 9
0.80 0.75 0.60 0.90 0.80 0.72 G-501 Fuse Blown restart in 590 min.
02/28/91 16 13 13 10 0.81 0.77 0.63 0.90 0.90 0.81 03/25/91 17 14 14 11 0.82 0.79 0.65 0.90 0.90 0.81 04/24/91 18 15 15 12-0.83 0.80 0.67 0.90 0.90 0.81 05/13/91 19 15 15 12 0.79 0.80 0.63 0.80 0.90 0.72 Fuel Supply Failure 05/13/91 20 1 '-
16 13 0.80 0.81 0.65 0.80 0.90 0.72 Star + Device Faiture restart in 50 m:n.
05/13/91 21 16 16 13 0.76 0.31 0.62 0.70 0.90 0.63 05/15/91 22 16 16 13 0.73 0.81 0.59 0.60 0.90 0.54 Start Device Failure restart in 13 min.
05/15/91 23 17 17 14 0.74 0.82 0.61 0.60 0.90 0.54-05/21/91 24 18 18 15 0.75 0.83 0.63 0.60 0.90 0.54 05/28/91 25 18 18 15 0.72 0.83 0.60 0.60 0.90 0.54 Start Device Falture restart in 191 min.
05/28/91 26 19 19 16 0.73 0.84 0.62 0.60 1.00 0.60 t
l 05/30/91 27 19
-19 16 0.70 0.84 0.59 0.50 1.00 0.50 Start Device Failure restart in 101 min.
05/30/91 28 20 20
-17 0.71 0.85 0.61 0.50 1.00 0.00 l
06/14/91 29 21 21 18 0.72 0.86 0.62 0.60 1.00 0.60 06/20/91 30 21 21 18 0.70 0.86 0.60 0.50 1.00 0.50 Start Device Failure restart in 54 min.
06/20/91 31 -
22 22 19 0.71 0.86 0.61 0.60 1.00 0.60 06/26/91 32 23 23 20 0.72 0.87 0.63 0.70 1.00 0.70 07/18/91 33 23 23 20 0.70 0.87 0.61 0.60 1.00 0.60 Start Device Faiture j
l 07/18/91 34 24 24
'20 0.71-0.63 0.59 0.60 0.90 0.54 High Bearing Tenp 07/18/01 35 25 25 21 0.71 0.84 0.60 0.70 0.90 0.63 08/12/91 36 25 25 21 0.69 0.84 0.58 0.60 0.90 0.54 G-501 Fuse stown 08/12/91 37 25 25 21 0.68 0.84' O.57 0.60 0.90 0.54 Fuel Supply Failure 08/14/91 38 26 25 21 0.68 0.84 0.57 0.60 0.90 0.54 Minimum load or:ty for operability check 08/14/91 39 27 26 22 0.69 0.85 0.59 0.60 0.90 0.54 09/09/91 40 27 26 22 0.68 0.85 0.57-0.60 0.90 0.54 G-500 failure restart in 24 min. with repair 09/09/91
. 41 28 27 23 0.68 0.85 0.58' O.60 0.90 0.54 09/11/91 42 29 2C 24 0.69 0.86 0.59 0.60 0.90 0.54 t
i 09/15/91 43 30 29 25 0.70 0.86 0.60 0.70 0.N 0.63 j
09/19/91 44 31 '
30 26 0.70-0.87 0.61 0.70 0.90 0.63 10/10/91 45 32 30 26 0.71 0.87 0.62 0.70 0.90-0.63 Mininun toad only for operability check i
10/17/91 46 33 31 27 0.72 0.37 0.62 0.80 0.90 0.72 10/18/91 47 34 32 28
- 0. 72 0.88 0.63 0.90 0.90 0.81 10/20/91 48 35 32 28 0.73 0.88 0.64 0.90 0.90 0.81 Minimum toad only for operability check 10/22/91 49 36 33 29 0.73 0.38 0.65 0.90 0.90 0 81 3
A
)
w+
-u
-. + -. a n.
a,a-.
--.~.n.,
..w.-
.--~.-+n.--
,-u
-,.-+
_w.~~~~.
..-. ~,... - -- -..-.
4 9
r i
l i
d t
I w
w w
i t
t.-
t e
e
. sea m
N i
M eh w
.C
.t: ** L T
'S IST e
W L
M ' w
(
L L
L y
e E
.e.a j
e w
w y
$5 e
f 4. 9 6
L w
64 a
L 0
- h. OL w
9-
.- k.* 0 a
-O
-Q a
-d b-b L
L-*
4 h
. g h
h L
L L
L S.O e og tg.
6 80 508 33 a
a-a-a e e w -.
i W
W we
/ O L
b L
L t
- Or ts
@~
0-0 l
>*.T C 55 C.5 t uwz
= ax
-ra I
I W2.R.B.8888888888888888888
~
j
..e wo = O O O O O O cs O O O O - - - - - - - - - - e-4 i
jO 3 E o '8au.lo.888888888888888888888 Q
4
}
.g Qe-e-neeeeeeen-en-e--
u f
a g
- =+80CQOOOOOOOOOOOOOOOOOOO at - O. 40. so. 40 00 40 00. EO. to. 90. Om. O. O. O. O. O. O. O. O. O. O. O.
{
<e
- - a O O O O O O O O O O O ** e- *- *a e= e= e e-e= e- *=
s M
S i
]
i 0.%.G.3 3.G. 3 3 4 4 3.S. S.S. S.S.R.R.R.E.R.R.
4
.O.a O O O O O O O O O O O O O O O O O O O O O O
.-w
.e to ** en O O fim Q O '.,. O O O O O O O O - *=*= -
i e
- CC 2'> 4 40 40. M. su. 0. e. t". O. C* Os. 06. O. O=. 0 0 06. O. C6 0k.
e u
Q.a K O sJ O O K
'uO O O O O Q O O O O O O Ot.;y O O 5
['
W
~
a j
E W E. E. R. R. R. R. A. A. R. R. R. $. d. k. D. M.. R. R. R. R.
..l000000000000000' t..00000 g
ga b
N M
MM MM h4 l
Wu Ny zw
- o.
+
MMMMM MM dh st g
W
- ~
M F.
Mt
s M 4
44mb m
1 Wu zw A
i
>= te o e-N M 4 m 4 N 00 0 O== N M 4 m N og Om o e-3 af wemmmmmmmmm4444v4 cv4NN 3
>E m ww 4
e-e e-.~
e e e-w
=v*e-w w e N N N N N N N N 4
won O 06 Os O Ok Ch0h O$ Ch O' 06 On Oh Os O' 0606O
% % % % % %' Om 0* 0%
e 4 *.? st m to O e-4 Om N N 4 O% % % % % % % % % % % % %. O O O N N st 4 e-83 4#
1-4 >- N N N N N M O O *= O O e- *= N e e- *= e-N N N *-
w N%%NN%N%%%%%NNN%%NNNN%
l e*
O O O O O O e= e-e- N N N N N *- e-e- e e e-N M o O e e-e-e= e e-e-e-e-e=e-e-e-e-O O O O O O O O a
i I
4 4
4 4
_,m.-.
-m.--,,.m..m,_..
....-..m.
~. -... _... ~, -. -
..r,-,--..m..--
4 i
GAS TURBINE REUABlUTY SINCE JUNE 1990 j
TOTAL REUABILfiY 1
= :r: -- --
0.9-M 4
08 0.7 k
-se bcsp N g-[
x M-B" h0.6 a
E N
3ee<
X M M
@ 0.5-i
- ++
3 m
@ 0.4 1
nu oc 88 l
0.2
= - - - -
O.1 day 90 Aug-90 No4-90
- Mai 91 Jud-91 Sekel Ded 91 Apr 92 DATE 1
l START REUABluTY 1
=:=:
0,9-a o
a a a
OS
=
- =:::
fau 0.7 SR g g i c
0.6 0
0.5
=
x-e 0.4 l
0.3 0.2 0.1 day-90 Auh90 NoO-90 Maf 91 Jud-91 Sek91 Ded91 Apr 92 DATE-LOAD RELIABluTY i
1
- =
=: 2: :r:.
0.9
--m m
0.8 gu --
0.7
=
=
se h 0,6
=
0.5
= ::
y 0.4 0.3 0.2 0.1 ay-00 Auh90 No4-90 Mar 91 Jud-91 Sep-91 Ded-91 Apr-92 DATE l o cuuuwivE x SUDING-10 l e
v e
e, e.e-.
er+-
.,e.
---m.
eve,r,j,c-.,,e,.--9.,..er.,
.,g-c-y.-
1 9p, ver
-,w +
gym,2-,-,.9-r.--9,,,-
. -.~
4 1-l j.
THE GAS TURBINE GENERATOR OVERHAUL and UPGRADE j
AND THE POST-OVERHAUL TEST PLAN j
i In April 1992, during an internal fiber-optic scope inspection of j-the gas turbine generator (GTG), %ns discovered component degradation and wear.
After consultation.with Westinghouse, the
]
GTG manufacturer, we declared the GTG out of_ service and began preparations for a major overhaul of the GTG.
t The GTG overhaul will include repairs of the first stage vanes, combustor baskets, combustor casings, and the exhaust stack.
f Additionally, there are other suspected problems that sun will investigate during the GTG disassembly.
These suspected problems include an inadequate reduction. gear concrete pedestal and rotor blade wear.
Other critical parts will'be repaired as necessary, based on the results of post-disassembly inspections.
As part of this overhaul, we will also be completing modifications and-upgrades to the GTG that are expected.to further imp' rove the reliability.
Post-overhaul testing will demonstrate the GTG operability and re-establish the-achievability of.95% reliability.
Once again, due to lack of AAC reliability guidance, EDG reliability guidance is being used.
Initiative-SA in EUMARC 87-00 states that an emergency diesel generator experiencing four or more failures in the last twenty-five' demands will. demonstrate restored performance by conducting seven consecutive failure-free start and load-run tests.
This accelerated testing shall'be conducted at a frequency of no less than twenty-four hours and no more than seven-days between_each demand._
The key aspect of.this guidance is " demonstrate restored performance." ' We will adapt this-guidance to our GTG and demonstrate its-" restored performance" by completing seven consecutive successful tests.
The testing of the GTG-will continue at a-frequency of no more than fourteen days between each-demand until at least an additional thirteen start andiload-run tests are completed.. _ If more than two countable failures occur during the additional thirteen tests, then-we will provide a letter to the NRC within sixty days of-the second failure.
This letter will explain the circumstances of the failures and how!we propose to continue with Station Blackout Rule compliance.
If the'seven consecutive'and
~
the thirteen additional tests with two or fewer countable failures are completed,-then we will provide a-letter that-gives the results of this testing ~asl confirmation of'its completion.~
The proposed schedule for_these efforts is completion of the gas-turbine overhaul in OctoberL1992, then approximately four weeks-to complete the'seven consecutive failure-free start.and load-run tests, and then approximately twenty-six weeks or ' less : (i.e.,_ by May 1993) for-the additional thirteen-tests. ' Afterward, testing-i will continue'on at least-a quarterly basis:as part ofitheLGTG:
reliability program.
i l
i k
,-m,
..,_m_..-........m_..-~,,
..-..m,_m,%.
...~.-,,e-...,-...-.mww,w....-.
. ~..,.
5._
e 2
_ +
j THE TEMPORARY DIESEL GENERATQR i
On April 23, 1992, we b'egan the process of procuring and installing a temporary diesel generator (TDG) to be connected to the Appendix R alternate shutdown system switchgear.
The procurement began after the the determination that an overhaul of the GTG was necessary.
On June 15, 1942, we completed the post-installation acceptance test of the TDG.
The temporary modification that installed the TDG was placed in service on-j June 19, 1992.
The TDG is a Caterpillar Model 3515 rated at 1750 kW.
The TDG is able to provide power to the alternate shutdown system switchgear in lieu of the GTG.
The TDG provides for the same capability as the GTG for Appendix R fire scenarios where the GTG may be j
required to operate.
The TDG does not have the same capability as the GTG for station blackout because the GTG could provide power through the normal electrical distribution system and hence could supply all loads determined to be necessary for a station' blackout.
The alternate shutdown system provides power to c subset of loads previously l
considered for station blackout (see the attached load lists).
The TDG is connected to the alternate shutdown system switchgear, which is used for placing the plant in shutdown for Appendix R fire scenarios that cause inoperability of some of the normal electrical distribution system.
Therefore, the TDG can be used l
to achieve and maintain safe shutdown using Appendix R aquipment.
i l
l I
i i
.m,
,m.
..w.--
,e-,
.r.-
4
---r+--'-
- e e
--ew-7-+**yw+
-rw---
y 1
Station BlacAout Load List l
Load
_HE KW Number Iptal I
Service Water Pump 300 239.3 2
478.6 Instrument Air Compressor 100 93.0 1
93.0 Containment Fan Cooler 150 45.0 2
90.0 1
Shroud Fan 60 25.0 2
50.0 Cavity Cooling Fan 40 20.0 2
40.0 Cable Spreading Room Cooling 15 12.4 2
24.8 Control Room Cooling Fan 15 12.4 2
24.8 l
Boric Acid Transfer Pump 7.5 6.2 2
12.4 Computer Room Cooling Fan 15 12.4 2
24.8 Component Cooling Water Pump 250 207.2 2
414.4 l
Charging Pump 100 82.9 2
165.8 EAC Lighting 27.0 1
27.0 j
Battery Charger D07 54.0 1
54.0 Battery Charger D08 54.0 1
54.0 Battery Charger D107 75.0 1
75.0 Battery Charger D108 75.0 1
75.0 i
Battery Room Fan 12.5 9.3 1
9.3 Total Load 1712.9 i
Alternate Shutdown System Loads for station Blackout i
Load
_H2 IM Number Total Service Water Pump 300 239.3 2
478.6 Charging Pump 100 82.9 2
165.8 Component Cooling Water Pump 250 207.2 2
414.4 Batttery Charger D109 75.0 1
75.0 i-Battery Room Fan 12.5 9.3 1
9.3 l
l Total Load 1143.1 l
4
+
~
e-m v,
r,v n,-s-,, e
-r- - - - - ----