05000446/LER-2011-003, Re EDG 2-02 Inoperable Due to Fuel Oil Leak
| ML11243A049 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/22/2011 |
| From: | Flores R, Madden F Luminant Generation Co, Luminant Power |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CP-201100901, TXX-11084 LER 11-003-00 | |
| Download: ML11243A049 (7) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(v), Loss of Safety Function 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 |
| 4462011003R00 - NRC Website | |
text
Rafael Flores Luminant Power Senior Vice President P 0 Box 1002
& Chief Nuclear Officer 6322 North FM 56 rafael.flores@Luminant.com Glen Rose, TX 76043 Luminant T 254 897 5550 C 817 559 0403 F 254 897 6652 CP-201100901 Ref. # 10CFR50.73(a)(2)(i)(B)
Log # TXX-11084 10CFR50.73(a)(2)(v)
August 22, 2011 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
SUBJECT:
COMANCHE PEAK NUCLEAR POWER PLANT DOCKET NO. 50-446 UNIT 2 EDG 2-02 INOPERABLE DUE TO FUEL OIL LEAK LICENSEE EVENT REPORT 446/11-003-00
Dear Sir or Madam:
Pursuant to 10CFR50.73(a)(2)(i)(B), Luminant Generation Company LLC (Luminant Power) hereby submits enclosed Licensee Event Report (LER) 446/11-003-00, "Unit 2 EDG 2-02 Inoperable Due to Fuel Oil Leak." This event did not affect the health and safety of the public or plant personnel.
This communication contains no licensing basis commitments regarding Comanche Peak Units 1 and 2.
Should you have any questions, please contact Ms. Tamera J. Ervin-Walker at (254)897-6902.
Sincerely, Luminant Generation Company LLC Rafael Flores By:
/
?
W. Madden Director, Oversight & Regulatory Affairs TJEW Enclosure c -
E. E. Collins, Region IV Balwant Singal, NRR Resident Inspectors, Comanche Peak A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
- Comanche Peak
- Diablo Canyon
- Palo Verde
- San Onofre - South Texas Project
- Wolf Creek
Enclosure to TXX-1 1084 NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION
/
NO. 3150-0104 (10-2010)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE Comanche Peak Nuclear Power Plant (CPNPP) Unit 2 05000 446 1 OF6
- 4. TITLE UNIT 2 EDG 2-02 INOPERABLE DUE TO FUEL OIL LEAK
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR FACILITY NAME DOCUMENTNUMBER NUMBER NO.
06 21 2011 2011 003 00 08 22 2011 FACILITY NAME DOCUMENTNUMBER 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
E] 20.2201(b)
(]
20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii)
[] 20.2201(d)
El 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(A)
[I 50.73(a)(2)(viii)(A)
El 20.2203(a)(1) rl 20.2203(a)(4)
H 50.73(a)(2)(ii)(B) 50.73(a)(2)(viii)(B)
[] 20.2203(a)(2)(i)
[
50.36(c)(1)(i)(A)
[J 50.73(a)(2)(iii) 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL iT 20.2203(a)(2)(ii)
[J 50.36(c)(1)(ii)(A)
[]
50.73(a)(2)(iv)(A)
[]
50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
El 50.36(c)(2)
El 50.73(a)(2)(v)(A)
[T 73.71(a)(4) 100 El 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
[]
50.73(a)(2)(v)(B)
El 73.71(a)(5)
El 20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)
El OTHER [T
20.2203(a)(2)(vi)
[
50.73(a)(2)(i)(B)
MX 50.73(a)(2)(v)(D)
VOLUNTARY LER
- 12. LICENSEE CONTACT FOR THIS LER FACILITY NAME TELEPHONE NUMBER (Include Area Code)
Timothy A. Hope, Nuclear Licensing Manager 254-897-6370CAUSE SYSTEM COMPONENT MANU-REPORTABLE
CAUSE
SYSTEM COMPONENT MANU-REPORTABLE FACTURER TO EPIX FACTURER TO EPIX
- 14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEAR SUBMISSION E
YES (If yes, complete 15. EXPECTED SUBMISSION DATE)
NO DATE ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)
On April 15, 2011, Unit 2 was in Mode 6 for the 2RF12 refueling outage. At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, a 12 drop per minute (dpm) fuel oil leak was discovered on the Train B Emergency Diesel Generator (EDG 2-02). The leak was not corrected during 2RF 12 because the leak was believed to be through the pipe threads, it did not constitute a structural failure, and the size of the leak did not affect the operability of EDG 2-02. On May 10, 2011, a 24-hour run of EDG 2-02 was commenced at 2304 hours0.0267 days <br />0.64 hours <br />0.00381 weeks <br />8.76672e-4 months <br /> per Technical Specification (TS) requirements. At the start of the run, the fuel leak was 12 dpm. Over the course of the run, the leak worsened, until at the 13-hour point it exceeded one liter per minute (1pm). EDG 2-02 was secured and declared inoperable at 1326 on May 11, 2011. Repairs were completed at 0425 hours0.00492 days <br />0.118 hours <br />7.027116e-4 weeks <br />1.617125e-4 months <br /> on May 12, 2011 and EDG 2-02 was declared operable. The cause of the event was fatigue failure caused by long-term vibration stresses. Corrective actions included inspecting EDGs 1-01, 1-02, and 2-01, and no other leaks were identified. All times in this report are approximate and Central Time unless noted otherwise.
NRC FORM 366 (10-2010)
PRINTED ON RECYCLED PAPER NRC FORM 366 (10-2010)
PRINTED ON RECYCLED PAPER (If more space is required, use additional copies of SUMMARY OF THE EVENT, INCLUDING DATES AND APPROXIMATE TIMES:
On April 15, 2011, at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, Unit 2 was in Mode 6, approximately two weeks into the twelfth refueling outage (2RF 12), when a 12 drop-per-minute (dpm) fuel oil leak was discovered on a Schedule 80 carbon steel fuel oil crossover header of the Train B Emergency Diesel Generator (EDG 2-02) [EIIS: (EK) (DG)]. No attempt was made to fix the leak at the time of discovery due to EDG 2-02 being under a Defense in Depth (DID) for work on the Unit 2 Train A EDG (EDG 2-01).
The EDG System Engineer (Utility, Non-licensed) evaluated the Schedule 80 carbon steel pipe leak and provided an operability determination. After a close visual inspection, the System Engineer determined the leak to be through the threads of the pipe fitting and that it did not constitute a structural failure. Furthermore, the 12 dpm leak did not impede the EDG 2-02 from accomplishing its designed function.
The EDG System Engineer provided the results of his evaluation as his input to an operability report. That report resulted in the Operations Department determining EDG 2-02 remained operable.
(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 (If more space is required, use additional copies of NRC Form 366A) (17)
However, during this period of time, the non-safety Alternate Power Diesel Generators were available and had the capacity and capability of supplying the necessary equipment for safe shutdown and long term cooling for Unit 2.
IV. CAUSE OF THE EVENT
The cause of the EDG 2-02 fuel oil piping failure was fatigue failure caused by long-term vibration stresses. In addition, it was not recognized that the leak was of a condition where subsequent degradation could occur and could impact the EDG's mission time. Therefore, the repair was not scheduled in an expeditious manner consistent with the EDG's safety significance.
V. CORRECTIVE ACTIONS
The EDG 2-02 crossover piping was repaired and the EDG 2-02 was declared operable. The other EDGs (EDG 1-01, 1-02, and 2-01) crossover piping and piping connections were inspected and no leaks were identified. Additionally, no other leaks of the Schedule 80 carbon steel crossover header piping were identified during inspections for the OPT-214 runs for the other EDGs. Further evaluation of flow induced vibration for the EDG fuel systems, including base excitation is being performed and tracked in the corrective action program. As part of the corrective action program, the process for conducting operability evaluations of similar degraded conditions is being reviewed for additional improvements.
VI. PREVIOUS SIMILAR EVENTS
There have been no previous similar reportable events at CPNPP in the last three years.PRINTED ON RECYCLED PAPER