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Category:ABNORMAL OCCURRENCE REPORTS (SEE ALSO LER & RO) LICENSEE EVENT REPORT (SEE ALSO AORO)
MONTHYEARML20084P8241975-05-30030 May 1975
AO 50-249/75-28:on 750522,main Steam Line Area Temp Sensors 261-16B,261-17 A-D & 261-18D Found W/Setpoints Above Tech Spec Limit.Caused by Misapplied Switches.Switches Reset within Tech Spec Limit
ML20084Q0341975-05-19019 May 1975
AO 50-249/75-26:on 780509,during Discharge test,24/48 Volt Dc Batteries Failed to Deliver Rated ampere-hour Capacity. Caused by Six Bad Cells in One Battery & Four Bad Cells in Other.Deteriorated Cells Will Be Replaced
ML20084Q7331975-05-0606 May 1975
AO 50-249/75-24:on 750426,during Routine Calibr of HPCI Area Temp Sensors,Setpoints on 12 of 16 Temp Sensors Found Above Tech Spec Limit.Caused by Unsuitable Existing Temp Sensors for First Operation Surveillance Type Operation
1975-05-06
[Table view]
Category:TEXT-SAFETY REPORT
MONTHYEARML20249C8491999-09-30030 September 1999
1999 Third Quarter Rept of Completed Changes,Tests & Experiments Evaluated,Per 10CFR50.59(b)(2), for Dresden Nuclear Power Station. with
ML20217A1691999-09-22022 September 1999
Part 21 Rept Re Engine Sys,Inc Controllers,Manufactured Between Dec 1997 & May 1999,that May Have Questionable Soldering Workmanship.Caused by Inadequate Personnel Training.Sent Rept to All Nuclear Customers
ML20210R6081999-07-31031 July 1999
Monthly Operating Repts for July 1999 for Dresden Nuclear Power,Units 1,2 & 3.With
ML20209E1291999-06-30030 June 1999
Monthly Operating Repts for June 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20209J3481999-06-30030 June 1999
1999 Second Quarter Rept of Completed Changes,Tests & Experiments, Per 10CFR50.59.With
ML20210D3071999-06-30030 June 1999
Corrected Page 8 to MOR for June 1999 for DNPS Unit 3
ML20195G6381999-05-31031 May 1999
Monthly Operating Repts for May 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20195B2591999-05-19019 May 1999
Rev 66a to CE-1-A,consisting of Proposed Changes to QAP for Dnps,Qcs,Znps,Lcs,Byron & Braidwood Stations
ML20206N2821999-04-30030 April 1999
Monthly Operating Repts for Apr 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20206B1901999-03-31031 March 1999
First Quarter Rept of Completed Changes,Tests & Experiments Per 10CFR50.59 for Dresden Nuclear Power Station. with
ML20205N7491999-03-31031 March 1999
Monthly Operating Repts for Mar 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20207M6921999-02-28028 February 1999
Monthly Operating Repts for Feb 1999 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20207E9311999-02-26026 February 1999
Part 21 Rept Re Sprague Model TE1302 Aluminum Electrolytic Capacitors with Date Code of 9322H.Caused by Aluminum Electrolytic Capacitors.Affected Capacitors Replaced
ML20199M0891999-01-22022 January 1999
Part 21 Rept Re Failure of Square Root Converters.Caused by Failed Aluminum Electrolytic Capacitory Spargue Electric Co (Model Number TE1302 with Mfg Date Code 9322H).Sent Square Root Converters Back to Mfg,Barker Microfarads,Inc
ML20199D3261998-12-31031 December 1998
10CFR50.59 SER for 1998-04 Quarter, of Changes,Tests & Experiments.With
ML20199C8951998-12-31031 December 1998
Monthly Operating Repts for Dec 1998 for Dnps,Units 1,2 & 3
ML20205M7061998-12-31031 December 1998
Unicom Corp 1998 Summary Annual Rept. with
ML20197G8591998-11-30030 November 1998
Monthly Operating Repts for Nov 1998 for Dresden Nuclear Power Station.With
ML20196A4191998-11-19019 November 1998
Safety Evaluation Accepting QA TR CE-1-A,Rev 66 Re Changes in Independent & Onsite Review Organization by Creating NSRB
ML20196J0061998-11-19019 November 1998
Rev 66 to Topical Rept CE-1-A, QA Program
ML20195D2861998-10-31031 October 1998
Monthly Operating Repts for Oct 1998 for Dresden Nuclear Power Station.With
ML20154L3681998-09-30030 September 1998
Monthly Operating Repts for Sept 1998 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20154N4131998-09-30030 September 1998
1998 Third Quarter 10CFR50.59 Rept, for Dresden Nuclear Power Station of Completed Changes,Tests & Experiments
ML20153C5061998-09-21021 September 1998
SER Accepting Qualified Unit 1 Supervisor Initial & Continuing Training Program for Dresden Nuclear Power Station,Unit 1
ML20151Y2711998-08-31031 August 1998
Monthly Operating Repts for Aug 1998 for Dresden Nuclear Power Station,Units 1,2 & 3.With
ML20237E2331998-08-21021 August 1998
Revised Pages of Section 20 of Rev 66 to CE-1-A, QA Topical Rept
ML20237A7161998-07-31031 July 1998
Monthly Operating Repts for July 1998 for Dresden Nuclear Power Station,Units 1,2 & 3
ML20236Q5851998-06-30030 June 1998
1998 Second Quarter 10CFR50.59 Rept, for Dresden Nuclear Power Station of Completed Changes,Tests & Experiments
ML20236F8131998-06-30030 June 1998
Rev 0 to Defueled SAR Dresden Nuclear Power Station Unit 1 Commonwealth Edison Co
ML20236T8331998-06-30030 June 1998
COLR for Dresden Station Unit 3,Cycle 15
ML20236T8391998-06-30030 June 1998
Rev 1 to EMF-96-141, Dresden Unit 3 Cycle 15 Reload Analysis Rept
ML20236M6041998-06-30030 June 1998
Monthly Operating Repts for June 1998 for Dresden Nuclear Power Station,Units 1,2 & 3
ML20248M3021998-05-31031 May 1998
Monthly Operating Repts for May 1998 for Dresden Nuclear Power Station,Units 1,2 & 3
ML20248F3531998-05-21021 May 1998
Part 21 Rept Re Electronic Equipment Repaired or Reworked by Integrated Resources,Inc from Approx 930101-980501.Caused by 1 Capacitor in Each Unit Being Installed W/Reverse Polarity. Policy of Second Checking All Capacitors Is Being Adopted
ML20247F3391998-04-30030 April 1998
Monthly Operating Repts for Apr 1998 for Dresden Nuclear Power Station,Units 1,2 & 3
ML20217D0281998-04-22022 April 1998
Part 21 Rept Re Additive Constants Used in MCPR Determination for Siemens ATRIUM-9B Fuel by Core Monitoring Sys Were Found to Be non-conservative.SPC Personnel Notified All Customers w/ATRIUM-9B Lead Test Assemblies
ML20216D4411998-03-31031 March 1998
First Quarter Rept of Completed Changes,Tests & Experiments for 10CFR5059
ML20216C9651998-03-31031 March 1998
Monthly Operating Repts for Mar 1998 for Dresden Nuclear Power Station,Units 1,2 & 3
ML20216E2531998-02-28028 February 1998
Monthly Operating Repts for Feb 1998 for Dresden Nuclear Power Station
ML20202F7831998-01-31031 January 1998
Monthly Operating Repts for Jan 1998 for Dresden Nuclear Power Station
ML20199K1651998-01-23023 January 1998
Rev 65h to Topical Rept CE-1-A, Comm Ed QA Tr
ML20198P5321997-12-31031 December 1997
Monthly Operating Repts for Dec 1997 for Dresden Nuclear Power Station
ML20198P7021997-12-31031 December 1997
Fourth Quarter Rept of Completed Changes,Tests & Experiments Per 10CFR50.59
ML20216D3611997-12-31031 December 1997
Unicom Corp 1997 Summary Annual Rept
ML20203F8781997-11-30030 November 1997
Monthly Operating Repts for Nov 1997 for Dresden Nuclear Power Station
ML20199B0701997-10-31031 October 1997
Monthly Operating Repts for Oct 1997 for Dresden Nuclear Power Station
ML20217H7201997-09-30030 September 1997
Monthly Operating Repts for Sept 1997 for Dresden Nuclear Power Station,Units 1,2 & 3
ML20210V2401997-09-19019 September 1997
Rev 65g to Topical Rept CE-1-A, Comm Ed QA Manual
ML20216J3781997-08-31031 August 1997
Monthly Operating Repts for Aug 1997 for DNPS
ML20210H5511997-07-31031 July 1997
Monthly Operating Repts for July 1997 for DNPS IAW RG 1.16 & GL 97-02
1999-09-30
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Text
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BBS Ltr. 8310-75 Dresden Nuclear Power Station ~ ^ N R. R. #1 / 1h*ti Morris, Illinois 60450@).
May 19, 1975 /, j g3 3 1 n.:blik,.b A
.!9 ,4/AY221975 i
,m Mr. James G. Keppler, Regional Director o n.- Am #
Directorate of Regulatory Operation-Region III \(h '{ ,.y I!/
U. S. Nuclear Regulatory Cor=icsion 6 4 799 Roocevelt Road G1en Ellyn,.Illinoic 60137 4% awn q ' %
SUEJECT: REI'CRT OF !!UCR:'AL OCCURRCCE PER SECTICI 6.6. A 0F THE TECHNICAL SPECIT'ICATICH3 FAILURE OF f E 2h/48 VDC EA??ERIES
References:
- 1) Regulatory Guide 1.16 Rev. 1 Appendix A
- 2) Notification of Region III of U. S. Nuclear Regulatory Co:=ission Telephcne: P. Johnson, 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br /> on May 9, 1975 Telegram: J. Koppler, 1630 hours0.0189 days <br />0.453 hours <br />0.0027 weeks <br />6.20215e-4 months <br /> on May 9, 1975
- 3) Drawing Number 12E3324 Report Number: SC-249/1975-26 Report Date: May 19, 1975 Occurrence Date: Ihy 9,1975 Facility: Drecdon !!uclear Power Station, Morris, Illinois- 60450 IDE'JTIFICATION OF OCCURRE:CE The Unit 3 24/48 VDC batteries failed to deliver the rated ampere-hour capacity.
This ic a cafety systen component failure which could, or threaten to, render the system incapable of perfoming its intended safety function.
i i CONDITIG!S FRICR TO OCCURREiCE Unit 3 was in cold chutdown in the refac1 mode at the time of the occurrence, j No fuel was in the core.
DESCRIPTIC:I OF OCCUR 3C!CE t
On May 9, a dincharge test was run on both 24/48 VDC batteries to shou that each bank could deliver 80 ampere-hours before the bank voltage dropped below 42 volta. After 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, before the 80 ampere-hourn were reached, the voltage for each bank wac belou 42 volts.
9306130100 750519 E C 2.}.
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.- - - - --- ),g Msi d.16ddr F.ay 19,19'l5 Y 0
- j. 6ESIGNITION'OF APP /JGM CAUSE OF OCCUPJECE (Compondiit Failuro)
The batteries, failed to deliver the rated ampere-hour capacity due to six bad
-cells in one battery and four bad cells in the other battery. There are 24
! cells per 48 V battery. Tne voltage across these ten cells had dropped to scro,
! .- and several had gone into reversal. The loss of these cells caused the bank l
voltage to drop below 42 volts.
-ANALYSIS OF OCCURRENCE
'The 24/48.VDC system is used to power the IRM/ SIC 4 (intermediate and source range neutron monitor) circuits and the off-cas and process radiation monitors.
( -Normally these systems are powered by the silicon rectifier battery chargers.
In case of loss of both off-site power and the emergency diesel generators, the battery chargers would be inoperable and the batteries would supply the power..
At the time of the failure, no' fuel was-in the teactor. Thorofore, the 24/48 VDC batteries were not required to be operable. Had the batteries been needed while the unit was olorating, i the worst possible conscquence would have been irregular operation of the circuits involved after several hours of operation.
This is not considered significant since a reactor scram directly results from a loss of off-sito power. Therefore, this occurrence in no way endangered the health and-safety of the general public or plant personnel.
~
CORRECTIVE ACTION The ten cells that had deteriorated will be replaced, and the batteries vill be retested prior to core loading.
I PAIIJJRE DATA This is the first time the 24/48 VDC batteries of either unit 2 or 3 have failed. j
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B. B. Stephenson Superintendent BBS:ES:smp File /dRO b
