05000331/LER-2013-001, Regarding Emergency Diesel Generator Inoperability Results in Safety System Functional Failure
| ML13127A389 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 05/07/2013 |
| From: | Richard Anderson NextEra Energy Duane Arnold |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NG-13-0201 LER 13-001-00 | |
| Download: ML13127A389 (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 |
| 3312013001R00 - NRC Website | |
text
May 7, 2013 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001 Duane Arnold Energy Center Docket 50-331 Renewed Op. License No. DPR-49 Licensee Event Report #2013-001 NG-13-0201 10 CFR 50.73 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
Richard L. Anderson Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC NextEra Energy Duane Arnold, LLC, 3277 DAEC Road, Palo, lA 52324
NRC FORM 366 (10-2010)
PRINTED ON RECYCLED PAPER NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (10-2010)
LICENSEE EVENT REPORT (LER)
(See reverse for required number of digits/characters for each block)
APPROVED BY OMB NO. 3150-0104 EXPIRES: 10/31/2013 Estimated burden per response to comply with this mandatory collection request: 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />. Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Records and FOIA/Privacy Service Branch (T-5 F52), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to infocollects@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202 (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 1. FACILITY NAME Duane Arnold Energy Center
- 2. DOCKET NUMBER 05000331
- 3. PAGE 1 OF 3
- 4. TITLE Emergency Diesel Generator Inoperability Results in Safety System Functional Failure
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL NUMBER REV NO.
MONTH DAY YEAR FACILITY NAME N/A DOCKET NUMBER 05000 03 08 13 2013 001 0
05 07 13 FACILITY NAME N/A DOCKET NUMBER 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 20.2201(b) 20.2203(a)(3)(i) 50.73(a)(2)(i)(C) 50.73(a)(2)(vii) 1 20.2201(d) 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(A) 50.73(a)(2)(viii)(A) 20.2203(a)(1) 20.2203(a)(4) 50.73(a)(2)(ii)(B) 50.73(a)(2)(viii)(B) 20.2203(a)(2)(i) 50.36(c)(1)(i)(A) 50.73(a)(2)(iii) 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) 50.73(a)(2)(x) 20.2203(a)(2)(iii) 50.36(c)(2) 50.73(a)(2)(v)(A) 73.71(a)(4) 100%
20.2203(a)(2)(iv) 50.46(a)(3)(ii) 50.73(a)(2)(v)(B) 73.71(a)(5) 20.2203(a)(2)(v) 50.73(a)(2)(i)(A) 50.73(a)(2)(v)(C)
OTHER 20.2203(a)(2)(vi)
X 50.73(a)(2)(i)(B)
X 50.73(a)(2)(v)(D)
VOLUNTARY LER
- 12. LICENSEE CONTACT FOR THIS LER NAME TELEPHONE NUMBER (Include Area Code)
Robert J. Murrell, Engineering Analyst (319) 851-7900 CAUSE SYSTEM COMPONENT MANU-FACTURER REPORTABLE TO EPIX
CAUSE
SYSTEM COMPONENT MANU-FACTURER REPORTABLE TO EPIX
- 14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEAR YES (If yes, complete 15. EXPECTED SUBMISSION DATE)
X NO SUBMISSION DATE ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)
On March 8, 2013, while operating at 100% power, the A Emergency Diesel Generator (EDG) was in day 2 of 7 of Technical Specification (TS) Limiting Condition for Operation (LCO) in support of embedded conduit inspections. As part of post maintenance testing, the A EDG was operated and a small lube oil leak was discovered on the lube oil cooler heat exchanger. After maintenance activities to verify the heat exchanger channel head bolts were properly tight, a second run of the A EDG occurred. During this run, the lube oil leak increased to an excessive amount and the A EDG was manually tripped. The direct cause of the lube oil leak was inadequate gasket crush from maintenance activities that occurred during October 2012. The root cause of the failure was determined to be misalignment or flaws between the heat exchanger flange mating surfaces. The A EDG lube oil heat exchanger was repaired on March 9, 2013 and the EDG was declared operable. A past operability evaluation concluded that the A EDG was inoperable from February 16, 2013 to March 8, 2013. Since the A EDG was inoperable longer than its allowed TS seven day LCO, the event is reportable as a Condition Prohibited by TS. In addition, since the B EDG was inoperable on three occasions while the A EDG was inoperable, this event is reportable as an Event or Condition Alone That Could Prevent Fulfillment of a Safety Function.
(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)
PRINTED ON RECYCLED PAPER Corrective Action to Prevent Occurrence - Remove the A EDG lube oil cooler tube bundle and perform the following checks to determine condition of sealing surfaces:
Perform visual inspection of flange surfaces.
Perform Blue-Check of stationary channel head to heat exchanger shell sealing surfaces.
Measure clearances between shell and tube bundle flange without gasket installed.
Measure flatness of shell flanges and re-machine flange surfaces if not within tolerance (specified on the plant HX drawing or specified by ASME Engineer).
Measure and record vertical and horizontal alignment between the lube oil and jacket water channel heads.
V.
Additional Information
Previous Similar Occurrences:
A review of License Event Reports from the past 5 years did not identify any similar occurrence.
EIIS System and Component Codes:
EK - Emergency Onsite Power Supply System.
Reporting Requirements
This event is being reported as an Operation or Condition Prohibited by TS, 10CFR50.73(a)(2)(i)(B) and an Event or Condition That Could Have Prevented Fulfillment of a Safety Function, 10CFR50.73(a)(2)(v)(D).