05000331/LER-2010-001, Regarding Emergency Diesel Generator Start Due to Failed Arrester in Switchyard
| ML100630423 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 03/02/2010 |
| From: | Costanzo C NextEra Energy Duane Arnold |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NG-10-0134 LER 10-001-00 | |
| Download: ML100630423 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| LER closed by | |
| IR 05000331/2010002 (14 May 2010) | |
| 3312010001R00 - NRC Website | |
text
NEXTera ENERAN
ýý;~AFRN OLD March 2, 2010 NG-10-0134 10 CFR 50.73 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 Duane Arnold Energy Center Docket 50-331 License No. DPR-49 Licensee Event Report #2010-001-00 Please find attached the subject report submitted in accordance with 10 CFR 50.73. This letter makes no new commitments or changes to any existing
commitments
Christopher R. Costanzo Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC cc:
Administrator, Region Ill, USNRC Project Manager, DAEC, USNRC Resident Inspector, DAEC, USNRC gjl' NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, IA 52324
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION
,fIP5I4oD BY OMB NO. 3150-0104 EXPIRES:
(9-2007)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Duane Arnold Energy Center 05000 331 1 OF 4
- 4. TITLE Emergency Diesel Generator Start due to Failed Arrester in Switch ard
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIA REV MONTH DAY YEAR FACILITY NAME DOCUMENTNUMBER L NUMBER NO.
05000 01 01 10 2010 001 0
03 02 10 FACILITY NAME DOCUMENTNUMBER 1
05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 1-- 20.2201(b)
Ej 20.2203(a)(3)(i)
E 50.73(a)(2)(i)(C)
F]
50.73(a)(2)(vii) 1
- - I20.2201 (d)
[]
20.2203(a)(3)(ii)
[:], 50.73(a)(2)(ii)(A)
[]
50.73(a)(2)(viii)(A) 20.2203(a)(1)
E]
20.2203(a)(4)
D]
50.73(a)(2)(ii)(B)
[
50.73(a)(2)(viii)(B)
FW 20.2203(a)(2)(i)
[
50.36(c)(1)(i)(A)
Fjj 50.73(a)(2)(iii)
E]
50.73(a)(2)(ix)(A)
- 10. POWER LEVEL
[
20.2203(a)(2)(ii)
[
50.36(c)(1)(ii)(A)
[
50.73(a)(2)(iv)(A)
LI 50.73(a)(2)(x)
LI 20.2203(a)(2)(iii)
D 50.36(c)(2)
[l 50.73(a)(2)(v)(A)
[] 73.71(a)(4) 100%
EI 20.2203(a)(2)(iv)
[
50.46(a)(3)(ii)
E] 50.73(a)(2)(v)(B)
LI 73.71(a)(5)
LI 20.2203(a)(2)(v)
F]
50.73(a)(2)(i)(A)
E]
50.73(a)(2)(v)(C)
[
OTHER LI 20.2203(a)(2)(vi)
[
50.73(a)(2)(i)(B)
E]
50.73(a)(2)(v)(D)
VOLUNTARY LER
- 12. LICENSEE CONTACT FOR THIS LER NAME TELEPHONE NUMBER (Include Area Code)
Bob Murrell, Engineering Analyst 319-851-7900CAUSE SYSTEM COMPONENT MANU-REPORTABLE
CAUSE
SYSTEM COMPONENT MANU-REPORTABLE FACTURER TO EPIX FACTURER TO EPIX
- 14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEAR YES (If yes, complete 15. EXPECTED SUBMISSION DATE)
WXI NO DATE ABSTR1ACT [ (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewntten lines)
On January 1, 2010, while operating at 100% power, the 'A' Emergency Diesel Generator (EDG) automatically started from a valid undervoltage condition, but did not load onto its respective 4160 VAC bus. The momentary undervoltage condition was caused by a momentary fault on the 161 kilovolt (kV) Vinton Line. The momentary fault was caused by a failed lightning arrestor on the 161 kV line in the Duane Arnold Energy Center (DAEC) switchyard. The 'A' EDG supply breaker was not required to close onto its respective bus as it remained powered from its normal power supply during and after the undervoltage event. Offsite power remained fully operable during and following the event.
As designed, the 'A' Emergency Service Water (ESW) system automatically started. Additionally, in response to the momentary undervoltage condition, the 'B' Well Water Pump, the RWCU System, and the Spent Fuel Pooling Cooling System tripped.
The cause of this event is a lack of coordination of the EDG automatic start logic and the DAEC switchyard protective relaying.
There were no actual safety consequences and no effect on public health and safety as a result of this event.
NRC FORM 366 (9-2007)
PRINTED ON RECYCLED PAPER (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17)
EK - Emergency Onsite Power System EB - Low Voltage Power System - Class 1E FK - Switchyard System
Reporting Requirements
This event was reported under 10CFR50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B) of this section' due to the Auto Start of the 'A' EDG. Reference EN 45603.