ML20199G019
| ML20199G019 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 11/17/1997 |
| From: | Barron H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9711250072 | |
| Download: ML20199G019 (20) | |
Text
,
!I'i Duke Power Company A M, Fwy %ny y
nf&wherhaan u N nw rev 12700 Hagers Terry Rd, 1
Haniersville NC 28078h, H.*B. Barre,n Yxt braident,ivkGuire (704) 875-4800 OFFICE Nulent Generation ikpartment (704) 875-4809 fat November 17, 1997 U.
S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555
Subject:
McGuire Nuclear Station Docket No. 50-369 and 50-370 AT&T Round Cell Battery - Periodic Update By letter dated December 5, 1995, McGuire committed to periodically inform the NRC of the status of the dialog between McGuire and the vendor regarding battery capacity immediately following recharge. Please find attached the required update.
The 125-volt AT&T high specific gravity round cell battery banks have been replaced with conventional low specific gravity cell battery banks at McGuire.
Therefore, McGuire does not plan to provide further updates on this issue.
If further information is required, please contact Kay Crane, McGuire Regulatory Compliance at (704) 875-4306.
Sincerely, l
hww H. B. Barron, Vice President McGuire Nuclear Station f
I Attachment 4001 9711250072 971117 l$.lhllh hlkhh$f.hbh POR ADOCK O 39 o
P 1
U S. Nuclear Regulatory Commission November'17, 1997 P' age 2 s
cc:
Mr. Victor Herses U.
S. Nuclear Regulator Ccmmission Office of Nuclear Reactor Regulation (14H25)
Washington, D.C.
20555 Mr. Luis A. Reyes U.
S. Nuclear Regulatory Commission, Region II Atlanta Federal Center 61 Forsyth L't., SW, Suite 23T85 Atlanta, GA 30323 Mr. Scott M.
Shaeffer NRC Senior Resident Inspector McGuire Nuclear Statior.
I
i Aug--t 13.1997 Mr. Michael T. Cash Regulatory Compliance Manager McGuire Nuclear Station
Subject:
AT&T Round Cell Battery Capacity After Recharge Periodic Update per 12/05/95 Letter to NRC, Commitment #2 PIP 0-M95-2131, Corrective Action #13 In a letter dated 12/05/95, McGuire committed to periodically inform the NRC of the status of the dialog between McGuire and the vendor regrding recovered battery capacity immediately following i ;harging. The following is an update status of the dialog:
The issue of recovered capacity has been addressed by the A f&T Round Cell Nuclear Utility User's Council Charter - Expectation #1, sponsored by Arizona Public Service Company. Since the last update, the remaining concern is that of available battery capacity following an unplanned discharge on-line. To address this issue, testing was performed by Charter Power Systems, Inc. in Conshohocken, Pa., in accorf.ance with an approved test plan and direct supervision provided by the User's Counctl. The test objective was to determine the affect of various levels of" shallow" discharges on returned capacity aner recharge. The test scope was expanded to include low specific gravity cells and 3 aged cells from McGuire. Full details of the testing, along with test results, was presented at the May 15-16,1997 meeting of the User's Council. Test results indicate that both high and low specific gravity cells fail to recover full capacity after a partial discharge, followed by a subsequent recharge at float potential. In comparison, low specific gravity cells showed an average capacity loss of 6.4%, and high specific gravity cells loss an average of 17.9%. These test results are consistent with premature capacity loss (PCL) seen in previous high specific grevity perfomiance testing.
Copies of overhead sli(%s of the presentation on " Multiple Shallow Discharge Testing" are provided as an attachment to this letter.
Danny L Hepler CEN Engineering McGuire Nuclear Station ec: W.N. Matthews K.L. Crane R.W. Pierce File MC-1356.01
Multiple Shallow Discharge Testing AT&T Round CellNuclear Utility User's Council Meeting May 15-16,1997
~
0 Multiple Shallow Discharge Testing
+ Test Program Objective:
- Determine charge recovery for low and high gravity cells following multiple shallow discharges
~
l l
~
Multiple Shallow Discharge Testing i
+ Test Plan i
- Baseline capacity test: 2 hr rate to 1.75 V/ cell
- Recharge: high specific gravity cells 2.33 V/ cell, <10 amps / 2.7 V/ cell to 120%
- Recharge: low specific gravity cells 2.29 V/ cell for 54 hrs after current stabilizes for 3 consecutive hourly readings i
I
Multiple Shallow Discharge Testing
+ Test Plan (con't?
- Discharge: 200 Ah (2 hrs @ 100 amps)
- Float charge: 72 hrs following each 200 Ah discharge
- After 4th discharge / recharge cycle: 2 hr capacity discharge test to 1.75 V/ cell l
l
9 e
Multiple Shallow Discharge Testing Low Gravity List IS Round Cells Cell Serial #
History Initial Final Change Capacity Capacity A1 78835 New (11/96) 128.4 %
117.6 %
-8.4%
A2 48346 Used (8/91) 133.5 %
127.4 %
-4.6%
A3 48312 Used (8/91) 125.7 %
119.1 %
-5.3%
A4 78811 New (11/96) 127.2 % -
118.8 %
-6.6%
A5 78786 New (l1/96) 122.9 %
i14.3 %
-7.0%
m Multiple Shallow Discharge Testing High Gravity List 1SH Round Cells Cell Serial #
History Initial Final Change Capacity Capacity B1 97455 Used (5/91) 87.5 %
61.6 %
-29.6%
B6 56051 N: w (3/96) 128.7 %
108.4 %
-15.8%
B7 55559 New (3/96) 126.3 %
106.5 %
-15.7%
l 4
B8 56063 New (3/96) 126.7 %
98.5 %
-22.3%
j.
Multiple Shallow Discharge Testing
+ Test Results
- Recharging at float potential following multiple shallow discharges does not fully restore battery capacity
- Average high gravity capacity loss = 17.9%
- Average low gravity capacity loss = 6.4%
- Test results consistent with premature capacity loss (PCL) seen in previous high gravity performance testing
2 Multiple Shallow Discharge Testing List 1SH Round CeII 2hr rate to 1.75v
+
'~0~
2.05 1
2.05 1st 6scharge
+ 97455 (5/91)- 61.55%
1.95 1.95 1.85 1.85 3
3 cieT57455-prior j
j 6echarge test 1/E97 1.75 1.75 tween 1st and 2 red 1.65 m
dischrges: four 10 %,2hr
( DOAH) 6scharges wth 72hr 1.55 1.55 E8ENNEEENEENENE8 S 66 "' An $$ SS ds $9 ni M i
minutes i
L
m e-h Multiple Shallow Discharge Testing I
List 1SM Round Cell 2hr rate to 1.75v 2.1 2.1
+ 55559 (3/96) - 125.3%
t i,
2.05 2.05 1sidischarge 2
._, 55559(3/96)-
2 i
106.45% 2nd 1
1.95 '
1.95
{
y 1.9 1.9 1.85 1.85 g
1.8
/
1.8
/
Between 1st and 2nd 1.75 97455Jumperea 1.75 discharges:four 100A,2hr out, other cees i
(200AH) discharges w th 72hr 1.7 OC-5 &
1.7 EEEEEEEEEEMNMNMd 8 dd '" dd 4Y $$ di si nn 4 minutes i
E l
e.
Multiple Shallow Discharge Testing List 1SH Round Ceil 2hr rate to 1.75v 2.1 2.1
+ N W - 12m4 i i 2.05 105 ist discharge 2l 2
+ 56051 (196)- 108.4%
i p
1.95 '
1.95 2nd discharge 1.9 1.9 1.85 1.85 p
g 3
1.8 )
)
1.8 1.75.
i 1.75 17 Between ist and 2nd 1.7.
De455 dis harges:four100A,2hr 1.65 WM M 1.65
- M 1.6 1.6 1.55 1.55 8822asas32222332 8
)
d d "" d d U d B 3 Gi d s dn $
l minutes 1
4 k---
A
.h.
+
Multiple Shallow Discharge Testing List 1SH Rcund Cell 2hr rate to 1.75v 2.1 2.1 f
56053 (3/96)- 126.7 %
2.05 2
2 1st discharge 56063(3,96)- 98.5 %
1.95 1.95 2nd discharge 1.9 1.9
{ 1.85 1.85 y 1.8 1.8
/
1.75 1.75 j
/
setween 1st and 2nd 17 I7' 17455jurrpered -
dM7.str.as:fotr 100A.2hr F
1.65 out,other cens 1.65 (200AK discharges w th 72hr 1.6 1F sa nn sa aa as as aa as s ee as as te as gg 3 oo --
minutes 9
i
j l
Multiple Shallow Discharge Testing l
l I
I List 1S Round Cell 2hr rate to 1.75v 2.05 2.05
_e 48312 (EST)- 12511%
2
2 1st discharge
' L p 48312 (&91)- 119.1%
1.95 >
1.95 2nd 6scharge 1.9 l 1.9 E 1.85 1.85 E 2
?
1.8 1.8 1.75.
1.75 Between ist and 2nd discharges:foir 100A,2hr 1.7.
1.7 (200AH) ho p w th 72hr 1.65 1.65 NNEEEEEEkkEENNEEhk oo -- an se at as :: ans;g minutes
~
t E
B m
Multiple Shallow Discharge Testing List iS Round Cell 2hr rate to 1.75v 2.05 2.05
+ 48345 (891)- 133.47%
2 1st6scharge 2<
' [
. + 48346 ($21)- 127.4%
2nd discharge 1.95 1 1.95 1
1.9 l 1.9 E
'E S
S 1.85
. 1.85 1.8 1.8 B,twee31si and 2nd dischargca-four 100A,2hr 1.75 i 1.75 (200AH) decharges w th 72hr 1.7
. 1.7 kNNNEENEEEENEEhk ooaannsseesagggg minutes
O Multiple Shallow Discharge Testing Ust 1S Round CeII 2hr rate to 1.75v 2.05 2.05
+ I5/b6 (11/95) - 122.93%
1.95 1.95
+ 78786 (11/96)- 11425%
2nd disetwge 1.85 1.85 y 1.75 1.75 y 1.65 1.65 l
Ntween 1st and 2nd dischargos:four 100A,2hr IM
, 'IM (200AH) discharges w th 72hr 1.45 1.45 kkNENEEENENUENNN aaaseeasamsg oo**
minutes
=
9 h a Multiple Shallow Discharge Testing List 15 Round Cell 2hr rate to 1.75v 2.05 2.05
--e 78811 (11/96)- 127.22%
1stdischarge l
L
+ 78811 (11/96)- 118.75%
p g
2nd discharge l
1.9 1.9
{ 1.85 1.85 y 1.8 1.8 1.75 Betw een ist and 2nd 1.75 discharges:four 100A,2hr 17 1 17 (200AM discharges w th 72hr 1.65 1.65 kk Ek kk kk kk kk kk kk N ooaannesccsagggg g minutes
4 1
Multiple Shallow Discharge Testing i
l List 1S Round Cell 2hr rate to 1.75v 2.05 2.05
+ 75835 (11/95)- 12K39W 2'
2 1st elscharge F
78835(11FJ6)- 117.55%
1.95 2nd discharge 1.95 1.9 1.9
{ 1.85 1.85 {>
1.8 1.8 1.75 Detween 1st and 2nd 1.75 discharges:four 100A.2hr I 1.7 l(200AH) discharges w th 72hr 1.7 1.65 1.65 Ek EE EE EE EE EE Ek EN E "a nn es cr aa 39 gg g minutes
D z.
Multiple Shallow Discharge Testing Round Cell Multiple On-Line Shallow Discharges SN 78835 (1215 SG-new) 140 %
+SN 48346 (1.215 SG-used) 13v%.
-._.t______
SN 48312 (1215 SG-used) 23 SN 78811 (1.215 SG-new) 120 %.._ _____,-
_________c--____.}"s~==_O=g,g-__.____
SN78786(1.215 SG-new) i
~
110 %.
q
% 100%.-_____.._l____.-___l_______ Q -____.--
- -as_
SN 97455 (1.300 SG-used) 2 hr 90%.. _______'__...--_.'.. -___
---O-- SN 56051 (1.300 SG-new) rate fs l
l
- _. SN 55559 (1.300 SG _ new) to
**~~^~~~r'~~ %~'~r'~~~~~~~s~~~~~~~~~
_. + SN 50063 (1.300 SG-new)
+
i 1.75v 70%.___ ____....-.--_*_'s.__._+_-______.
~~
l l _ _ _ _ _ ' _ ~~~~~~~~~
200 AHr(2 hrs @ 100 A)
Discharpe # 2 - 4 1
Float - 72 hrs 1
5
- dl$ charges
.