05000237/LER-2013-001, Secondary Containment Inoperable Due to Two Interlock Doors Being Open Simultaneously
| ML13252A271 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/23/2013 |
| From: | Marik S Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| SVPLTR #13-0032 LER 13-001-00 | |
| Download: ML13252A271 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(s)(2) |
| 2372013001R00 - NRC Website | |
text
ADresden Nuclear Power Station 6500 North Dresden Road Exekon Generation Morris. IL 60450 815 942 2920 Telephone www.exeloncorp.com 10 CFR 50.73 SVPLTR # 13-0032 August 23, 2013 U. S. Nuclear Regulatory Comrmssion ATTN: Document Control Desk Washington, DC 2055-0001 Dresden Nuclear Power Statio, Unit 2 Renewed Facility Operating Ucense No. DPR-19 NRC Docket No. A0.237 Subject Licensee Event Report 237/2013-001-00, Secondary Containment Inoperable Due to Two Interlock Doora Being Open Simultaneously Enclosed Is Licensee Event Report 237/2013-001-00, Secondary Containment Inoperable Due to Two Interlock Doors Being Open Simultaneously. This is an Intmrim report which describes an event which is being reported in accordance with 10 CFR 50.73(a)(2Xv)(C), any event or conditon that could have prevented the fulfiment of the safety function of structures or systems thMt are needed to conol the release of radioactive mateal.
There we no regulatory wimmlbientst ctained in this submnittal.
Should you have any questions concerning this letter, please contact Mr. Glen Morrow at (815) 416-2800.
Rep Bfly, Shane M. Masik Site Vice President Dresden Nuclear Power Station Enclosure cc:
Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - Dresden Nuclear Power Station
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NRC FOR M SSA
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LUCENWSEE UVhNT REPORT LER)u YEA_
REV Dresden Nuclear Power Station, Unit 2 05000237 1,2 OF 3
172013
- - 0011 00 PLANT AND SYSTEM I)ENTIPICATION Dresden Nuclear Power Station (ONPS) Units 2 and 3 ae General Electric Company Boiling Waer Reactors witha licensed maximum power level of 2957 megawatts thermal. The Energy Industry Identification System codes ued in the text am idenified as IXXM A.r,,,
Unit 02 Event Dat: 06-28-2013 Event Time: 0749 hours0.00867 days <br />0.208 hours <br />0.00124 weeks <br />2.849945e-4 months <br /> CDT Reactor Mode: I Mode Name: Power Operation "Power Level: 100 percent Unit 03 Event Date: 06-28-2013 Event Time: 0749 hours0.00867 days <br />0.208 hours <br />0.00124 weeks <br />2.849945e-4 months <br /> CDT Reactor Mode: I Mode Name: Power Operation Power Level: 100 percent B.
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At 0749 CDT on June 28, 2013, Indication was received In the control room that two secondary containment [NG) doors leading to the Unit 2/3 EDG room were opened simultaneously. Two individuals from the Operations Oepaitment staff were exiting 2/3 EDO Room at the same time that a Radiation Protection Department technician In the Unit 2 Reactor Building was heading twards the 2/3 EDG room. The Individuals were able enter the Interlock at the soa time which resulted In both doom opening simultanecusly. The intMrkock was empty at the time the doors were opened simultaneously and it was reported that both red lights were out (i.e., indicating the other door was shut and the Interlock logic would allow the door to open) prior to the buttons being pushed to open the doors.
This event is being exoted In accordance with 10 CFR 50.73(aX2)vXC), any event or condition that could have prevented the fuAfillment of the sAft function of structures or systems that ae needed to control the rela-em of radioactive material.
C.
Based upon the result of troubleshooting, a degraded micro switch was identified which may have contributed to the door malfuncdon. However, the Cause of this evnt is still under Investigation.
DNPS intends to supplement this LER with the final cause(s) of this event $11e the Investigation Is complete.
D.
at "ls The Secondary Containment Interlock doors were open for mproxi ly seven seconds and based upon the short duration of the secondary containment doors being opened simultaneously and that the Secondary Containment differential pressure remained negative during the course of this event, this event is of low safety significance.
NRC FORM 306A (10-2010)
URC FORM 34A V10w01)
LICENESEE EVENT REPORT ILER "L Vic"EA HESULATMN COUMosI CONTIMATION SHR Dresden Nuclear Power Staion, Unit 2 wAMns As a result of this event site englneering is evaluating poti improvements that can be made to the Seconda Containment lnikoc circuitry.
F.
The caum of this event Is dtill being ialigi
, and DNPS intnds to suplprment this LER with the previous omuMet we sknimir to the ftnal cause(s) of the event described In this LER.
Not Applicabll WAC FOr =A (10-.M20)