ML20080A553
| ML20080A553 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 02/02/1984 |
| From: | Cutter A CAROLINA POWER & LIGHT CO. |
| To: | Vassallo D Office of Nuclear Reactor Regulation |
| References | |
| NLS-84-454, NUDOCS 8402060114 | |
| Download: ML20080A553 (19) | |
Text
....
CD&L SERIAL: NLS-84-054 Carolina Power & Light Company FEB 0 21984 Director of Nuclear Reactor Regulation At tention:
Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 Division of Licensing United States Nuclear Regulatory Commission Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UEIT NOS.1 AND 2 DOCKET NOS. 50-325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 BATTERY CAPACITY TESTING
Dear Mr. Vassallo:
At the request of your staff, a meeting was held on December 29, 1983 at the Brunswick Steam Electric Plant (BSEP) to discuss the events following the f ailure of emergency battery 2A2 to pass an 18 month load profile surveillance test. This test required that the battery maintain a load of 1211.9 amperes for 60 seconds (and subsequent lesser loads for 30 minutes and 71/2 hours) with a minimum output voltage of 105 volts.
Copies of the slides and
/ materials presented at that meeting are attached for your information.
As your are aware, following the initial failure of the battery to pass this test, Carolina Power & Light Company (CP&L) embarked on two parallel paths to resolve the situation.
The first of these was to locate and purchase new batteries as quickly as possible. A new battery was installed and tested and also failed to pass the required test.
In the subsequent several weeks, all ef forts 'to improve the peak load handling capability of these new batteries were unsuccessful, and CP&L ultimately re-installed the old batteries and successfully passed a test at an approved reduced peak 60 second current on December 31, 1983.
Gould, who manufactured both the original and replacement batteries has not yet determined why the new batteries did not meet the test requirements or improve with pre-conditioning cycles. They have committed to continue their investid; ion, however.
It is apparent that the test value of 1211.9 amperes (now 1074.9) represents
% extreme limit for the Gould 1200 amp-hour battery. Although the
- specification for the batteries indicates e one minute capacity in excess of 1328 amperes, it does not necessarily include the affects of intercell ConneClions.
8402060114 840202 PDR ADOCK 05000324 P
PDR h
411 Fayetteville Street
- P. O. Box 155 e Raleigh, N. C. 27602 m__
a[I
'D. B.*Veccallo Carolina Power & Light Company is presently conducting a DC load and battery sizing study in accordance with IEEE 485-1983 and other BSEP design codes and standards. This effort is scheduled for completion by February 15, 1984 at which time a determination will be made as to what further actions may be required. These may include further changes to the Technical Specifications, procedural revisions or modifications of the DC battery electrical system.
Should you have any further questions on this issue, please contact a member of our Licensing Staff.
Yours very truly, Y[b'"
A. B. Cutter, Vi P
dent Nuclear Engineering & Licensing JSD/ccc (9437JSD) cc:
Mr. D. O. Myers (NRC-BSEP)
Mr. J. P. O'Reilly (NRC-Ril)
Mr. M. Grotenhuis (NRC)
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' AGENDA Chronology of Current. Battery PT Performance 25 min.
Dan Moore Tech Support Battery PT. Performance History
. 15 min.
Dan Moore-Tech Support Battery Maintenance Practices 15 min.
Joel Dimmette Maintenance Current Status und Considerations 10 min.
Al Bishop Tech Support Questions Open Bob Poulk Facility Tour Reg Compliance 1
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2A-2 Battery Repair Sequence Date(s)
Work Items Completed 10/9 - 11/17 Equalize / float batteries for PT-17.6.
11/17 Run PT-17.6, batteries failed at 8.4 sec.
11/17 Cell number 27 was not responding properly and was replaced.
11/17 - 11/20 Equalized battery bank 2A-2.
11/20 Battery charger performing erratically, amplifier board was replaced.
11/20 - 11/23 Continued equalization battery bank 2A-2.
11/23 - 11/25 Floated battery bank 2A-2.
11/25 Replacement cell number 27 was not performing properly and was replaced and battery bank was returned to float.
11/26 Run PT-17.6, batteries failed. Voltage below 105 Vdc at 8.4 seconds. Retest voltage below 105 Vdc at 15.6 seconds.
11/26 Decision Point 1.
Initiate purchase order for new batteries.
2.
Generoce procedure to deep discharge and recharge batteries.
3.
Determine if technical specifications and de load study are too restrictive.
11/27 - 12/2 Perform SP 83-101 to deep discharge batteries to 0.5 Vdc per cell and recharge batteries to 2 95%
capacity.
Locate new batteries at Gould factory.
Engineering /QA visit factory.
Batteries shipped.
Begin removal of recharged 2A-2 and installed new 2A-2.
12/3 - 12/4 Performed / failed SP 83-102 (1.8 sec).
Reworked intercell connectors, removed five cells. Equalize.
Failed 83-102 again (1.8 sec).
Equalized.
12/5 Completed mini tests of 83-102 - Voltage at 103.62.
Batteries put on equalizer.
O Rt(a 168 Rt.
Date(s)
Work Items Comoleted 12/6 Performed three mini tests, all of which failed (104.95V, 105.34V, 104.9V).
SP 83-101 (deep discharge) initiated.
12/7 Technical specification change submitted. Deep discharge completed. Recharge started.
12/8 Replaced cell #47. Continued recharge. Prepared evaluation to shorten float and equalize line.
12/9 - 12/10 PT-17.6 failed after nine seconds.
12/11 - 12/15 Deep discharge / recharge per 83-101 initiated.
SP 83-105 equalize / float with constant current charger.
12/17-21 Performed PT-17.6.
Failed at 104.68 volts in seven seconds.
Battery discharged and recharged per SP 83-105.
Prepared / implemented SP 83-106 for spare cells.
12/21 Performed PT-17.6.
Failed at 104.28 volts in two seconds. Replaced cell 29.
Recharged and float.
12/22-23 Performed SP 83-107.
Failed at 104.38 in eight seconds.
2A2 on equalize / float.
Performed PT-17.6 on 2B-1.
Passed.
12/24 Performed SP 83-107 and 2A-2.
Failed at 104.61 in thirty seconds and 104.42 in forty seconds. Decided to remove newer cells and reinstall original battery 2A-2.
12/25-29 Replaced 2A-2 cells.
Prepared EER 83-0416 to reinstate original cells and test per SP 83-107.
1
2A-2 CAPACITY TEST DATA December 1982 - 1296.65 amp / hours @ > 105 volts November 27, 1983 - 1128 amp / hours @ > 105 volts.
(See note 1) 1.
One cell dropped below 1.75 volts at 1128 amp / hours although the battery voltage was > 105 volts at the time.
No further data on battery bank voltage was taken, only pilot cell was monitored. Therefore, battery bank capacity is > 1128 amp / hours. This was conducted by Special Procedure SP-83-101.
==
Conclusion:==
Technical specifications requirement for 60-month capacity test requires 80%
of manufacturers rating or 0.80 X 1200 = 960 amp / hours. Therefore, battery is not in jeopardy of failing capacity test.
Unit 2 Data - Load Profile Test Date 3-79 4-80 2-82 11-83 Battery 2A-1 2A-1 2A-1 2A-1 30 secs 107.7 (1068) 107.8 (1051) 107.6 (1051) 106.45 (1067) 30 mins 117.9 (241) 118.1 (238) 118.0 (241) 117.69 (246) 7 hrs 45 mins 116.5 (87) 116.7 (84) 116.1 (90) 115.88 (91)
Date 5-79 4-80 2-82 Battery 2A-2 2A-2 2A-2 30 secs 105.8 (1231) 106.2 (1220) 105.6 (1225) 30 mins 119.6 (171) 119.1 (170) 119.1 (171) 7 hrs 45 mins 118.4 (63) 118.7 (59) 118.0 (66)
Date 5-79 4-80 2-82 11-83 Battery 2B-1 2B-1 2B-1 2B-1 30 secs 106.7 (1107) 107.4 (1098) 108.2 (1099) 106 (1100) 30 mins 118.6 (188) 118.9 (ISS) 118.7 (188) 119 (180) 7 hrs 45 mins 118.2 (66) 118.4 (65) 118.6 (68) 119 (54)
Date 5-79 4-80 2-82 11-83 Battery 2B-2 2B-2 23-2 2B-2 30 secs 108.3 (1047) 108.4 (1037) 108.8 (1033) 107.83 (1056) 30 mins 118.3 (214)
.118.6 (211) 118.5 (214) 118.07 (219) 7 hrs 45 mins 118.1 (74) 118.0 (70) 117.3 (76) 117.42 (76) l i
BATTERY 2A-2 1 MINUTE DUTY CYCLE 1)
ASSUMPTIONS A)
UNIT 2 IS IN OPERATION B)
UNIT 1 IS IN COLD SHUTDOWN C)
LOSS OF 0FFSITE POWER (LOOP) & SMALL BREAK LOCA ON UNIT 2 PRESENTS WORST CASE LOADING ON 2A-2 BATTERY D) 2A-2 BATTERY CHARGER FAILED (SINGLE
. FAILURE)
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1200 iOOO BATTERY 281 ONE MINUTE DUTY CYCLE 800 600 477.57 400 343.7)
<314.5 347,47 289.55
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OTliER CONSIDERATIONS 0
CONTINGENCY PLANS
~
MANU'FACTURE OF NEW SET OF NCx 1200'S 0
0 PRESENTLY IN 3RD PRECONDITION CYCLE, READY FOR TEST 1/06/84.
TEST AFTER 2ND CYCLE INDICATED POTENTIALLY STRONGER BATTERY.
I I
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0 MODIFICATION TO INSTALL HARRIS PLANT BATTERIES (1350 C&D) IN PROGRESS j
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NEW LAYOUT APPEARS FEASIBLE O
PLAN TO TEST C&D BATTERY PRIOR TO INSTALLATION i
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O SUBMIT TECH SPEC CHANGE FOR FURTHER REDUCTION IN CURRENT 0
PRELIMINARY ANALYSIS INDICATES SIGNIFICANT REDUCTION POSSIBL,E O
ROOT CAUSE ASSESSMENT 0
EVALUATE DESIGN OF EXISTING BATTERIES / CHAR 5ERS FOR MODIFICATION IN UPCOMING OUTAGE O
PERFORM FAILURE ASSESSMENT OF "NEW" GOULD BATTERIES 9
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