05000374/LER-2009-001, Main Turbine Trip and Reactor Scram Due to Digital Electro-hydraulic Control Circuit Card Failure
| ML092940716 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 10/14/2009 |
| From: | Rhoades D Exelon Corp, Exelon Generation Co, Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 09-001-00 | |
| Download: ML092940716 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| 3742009001R00 - NRC Website | |
text
Exelcý)m LaSalle Generating Station 26o0 North 21st Road Marseilles, IL 61341-9757 www.exelonc'orp.com Nuclear October 14, 2009 10 CFR 50.73 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 LaSalle County Station, Unit 2 Facility Operating License No. NPF 18 NRC Docket No. 50-374
Subject:
Licensee Event Report In accordance with 10 CFR 50.73 (a)(2Xiv)(A), Exelon Generation Company, (EGC), LLC, is submitting Licensee Event Report Number 09-001-00, Docket No. 050.374.
Should you have any questions concerning this letter, please contact Mr. Terrence W. Simpkin, Regulatory Assurance Manager, at (815) 415-2800.
Respectfully, David P. Rhoades Plant Manager LaSalle County Station
Attachment:
- Licensee Event Report cc:
Regional Administrator - NRC Region III NRC Senior Resident Inspector - LaSalle County Station
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NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007)
, the NRC may digits/characters for each block) not conduct or sponsor. and a person is not required to respond to, the Information collection.
- 1. FACILITY NAME 2.-DOCKET NUMBER
- 3. PAGE LaSalle County Station Unit 2 05000374 1 OF 3
- 4. TITLE Main Turbine Trip and Reactor Scram due to Digital Electro-hydraulic Control Circuit Card Failure
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
[
- 8. OTHER FACILITIES INVOLVED FIACILITY NAME DOCKET NUMBER MOT A
YA ERSEQUENTIAL REV MONTH DAY YEAR I05000 MONT DAY YEAR YEAR NUMBER NO.
RATNG ODE 11.ThI REORTIS FACILITY NAME DOCKET NUMBER 08 15 2009 2009 001 00 10 2009 05000
- 9. OPERATING MODE
- 11. THIS REPORT 1S SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
[o 20.2201(b) 0 20.2203(a)(3)(i) 0] 50.73(a)(2XiXC) 0] 50.73(aX2Xvii) 1 0 20.2201(d) 0 20.2203(a)(3)(ii) 0 50.73(a)(2XIiXA) 0 50.73(aX2Xviii)(A) o 20,2203(aXl) 0 20.2203(aX4) 0 50.73(a)(2XIiXB) 0 50.73(a)(2XviiiXB) 0 20.2203(a)(2Xi)
[0 50.36(cXl)(IXA) 0 50.73(a)(2X)ii) 0 50.73(a)(2XIx)(A)
- 10. POWER LEVEL-0 20.2203(a)(2)(ii)
[0 50.36(cX1)(ii)A) 0 50.73(aX2)(ivXA) 0 50.73(a)(2Xx)
[o 20.2203(a)(2)(iii) 0 50.36(c)(2) 0l 50.73(aX2XvXA) 0 73.71(a)(4) 100 0 20.2203(a)(2)(iv)
[0 50.46(a)(3Xii) 0 50.73(aX2)(v)(B) 0 73.71(aX5) o 20.2203(a)(2)(v)
[0 50.73(a)(2XIXA) 0 50.73(aX2)(v)(C) 0 OTHER o 20.2203(a)(2Xvi)
E0 50173(a)(2Xi)(B)
[0 50.73(aX2)(v)(D)
Specify in Abstract below or In operating alarm response procedures that did not adequately warn the operators of the risk associated with the alarm.
D. SAFETY ANALYSIS
The safety significance of the event was minimal. The speed of the Main Turbine was confirmed to have been normal at the time of the trip. All control rods fully inserted, and all systems responded as expected to the scram.
E. CORRECTIVE ACTIONS
Corrective Actions:
- The failed VCMI card was replaced.
Corrective Action to Prevent Recurrence:
The DEHC vendor will provide the Station with an improved manual with enhanced information on fault codes and their associated risks.
DEHC alarms will be evaluated for potential impact, and the appropriate alarm procedures will be revised as necessary.
F. PREVIOUS OCCURENCES
A document review found no previous occurrences of a turbine trip/reactor scram due to an erroneous signal from DEHC.
G. COMPONENT FAILURE DATA
General Electric, VCMI Card IS215VCMIH2CA, Serial No. S15F073 NRC FORM 388A (9-2007)
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