05000362/LER-2013-001, Regarding Emergency Diesel Generator (EDG) Governor Actuator Hydraulic Fluid Contamination
| ML13028A477 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/25/2013 |
| From: | Bauder D Southern California Edison Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER 13-001-00 | |
| Download: ML13028A477 (4) | |
| 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 |
| 3622013001R00 - NRC Website | |
text
J SOUTHERN CALIFORNIA EDISON An EDISON INTERNATIONAL Company Douglas R. Bauder Site Vice President & Station Manager San Onofre Nuclear Generating Station 10 CFR 73 Appendix G January, 25, 2013 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001
Subject:
Docket No. 50-362 LER 2013-001-00, Emergency Diesel Generator (EDG) Governor Actuator Hydraulic Fluid Contamination San Onofre Nuclear Generating Station (SONGS), Unit 3
Dear Sir or Madam:
Attached is Licensee Event Report (LER) 2013-001-00, which is being submitted in accordance with 10 CFR 73 Appendix G.
This letter does not contain any commitments. If you have any questions regarding the attached report, please call Ryan Treadway at 949-368-9985.
Sincerely, Attachment: LER 2013-001-00 cc:
E. E. Collins, Regional Administrator, NRC Region IV R. Hall, NRC Project Manager, San Onofre Units 2 and 3 B. Benney, NRC Project Manager, San Onofre Units 2 and 3 G. G. Warnick, NRC Senior Resident Inspector, San Onofre Units 2 and 3 P.O. Box 128 San Clemente, CA 92672 (949) 368-9275 PAX 89275 Fax: (949) 368-9881 Doug.Bauder@sce.com
- - 7
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2013 [10-2010)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.
- 3. PAGE San Onofre Nuclear Generating Station (SONGS) Unit 3 05000362 1 of 3
- 4. TITLE Emergency Diesel Generator (EDG) Governor Actuator Hydraulic Fluid Contamination
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR N/A N/A NUMBER NO.
FACILITY NAME DOCKET NUMBER 11 27 2012 2013-001-00 01,
25 2013 N/A N/A D. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply) 0 20.2201(b)
[I 20.2203(a)(3)(i) 0l 50.73(a)(2)(i)(C)
[I 50.73(a)(2)(vii)
Defueled 1] 20.2201(d)
[I 20.2203(a)(3)(ii)
[I 50.73(a)(2)(ii)(A)
[I 50.73(a)(2)(viii)(A)
[I 20.2203(a)(1)
[I 20.2203(a)(4)
El 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B)
El 20.2203(a)(2)(i)
Cl 50.36(c)(1)(i)(A)
[I 50.73(a)(2)(iii)
[I 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL
[] 20.2203(a)(2)(ii) 0l 50.36(c)(1)(ii)(A)
[I 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x)
[I 20.2203(a)(2)(iii)
El 50.36(c)(2)
[I 50.73(a)(2)(v)(A)
El 73.71(a)(4)
El 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
[] 50.73(a)(2)(v)(B)
El 73.71(a)(5)
N/A [I 20.2203(a)(2)(v)
El 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C)
Z OTHER-10CFR73,App G [I 20.2203(a)(2)(vi)
El 50.73(a)(2)(i)(B)
El 50.73(a)(2)(v)(D)
Specify in Abstract below or in NRC Form 366A
- 12. LICENSEE CONTACT FOR THIS LER NAME TELEPHONE NUMBER (Include Area Code)
Douglas R. Bauder, Site Vice President and Station Manager 949-368-9275MANU-REPORTABLE MANU-REPORTABLE
CAUSE
SYSTEM COMPONENT FACTURER TO EPIX
CAUSE
SYSTEM COMPONENT FACURER EP IA FACURR T
EIXFACTURER TO EPIX N/A N/A
- 14. SUPPLEMENTAL REPORT EXPECTED
- 15. EXPECTED MONTH DAY YEAR SUBMISSION El YES (If yes, complete 15. EXPECTED SUBMISSION DATE) 0 NO DATE kBSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)
On October 23, 2012, during engineering walkdowns, the hydraulic fluid in the level sight glass of the San Onofre Nuclear Generating Station (SONGS) Unit 3 Train A Emergency Diesel Generator (EDG) governor actuator was found with an abnormal color (purple) and higher than normal indicated level.
On November 27, 2012, during subsequent investigation, additional reliable and substantive information including physical evidence was identified that supported a reason to believe (at that time) that tampering may have caused the abnormal condition. This event was reported as a one-hour notification to the NRC in accordance with 10 CFR 73, Appendix G, I(a)(3). Subsequently, while tampering could not be confirmed, it also could not definitively be ruled out as a possible cause. As such, this followup 60-day written report is being submitted.
This event did not affect plant operation or safety, since the EDG was out of service and not required to be operable during the period of time the governor actuator hydraulic fluid was contaminated.
Unit 3 has been shutdown since January 31, 2012, due to an unrelated event.
NRC FORM 366 (10-2010)U.S. NUCLEAR REGULATORY COMMISSION (10-2010)
LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET
- 1. FACILITY NAME
- 2. DOCKET
- 6. LER NUMBER
- 3. PAGE I SEQUENTIAL R
San Onofre Nuclear Generating Station (SONGS) Unit 3 05000362 YEAR NUMBER 2 of 3 2013
-- 001--
00 A.
REPORTABLE OCCURRENCE On October 23, 2012, during engineering walkdowns, the hydraulic fluid in the level sight glass of the San Onofre Nuclear Generating Station (SONGS) Unit 3 Train A Emergency Diesel Generator (EDG) [EK]
Engine #2 governor [65] actuator was found with an abnormal color (purple) and higher than normal indicated level. On November 27, 2012, during subsequent investigation, additional reliable and substantive information including physical evidence was identified that supported a reason to believe (at that time) that tampering may have caused the abnormal condition. This event was reported as a one-hour notification to the NRC in accordance with 10 CFR 73, Appendix G, I(a)(3) - Reportable Safeguards Events: Any event in which there is reason to believe that a person has committed or caused, or attempted to commit or cause, or has made a credible threat to commit or cause an interruption of normal operation of a licensed nuclear power reactor through the unauthorized use of or tampering with its machinery, components, or controls including the security system. Subsequently, while tampering could not be confirmed, it also could not definitively be ruled out as a possible cause. As such, this followup 60-day written report is being submitted in accordance with 10 CFR 73, Appendix G, Subpart I.
B.
INITIAL CONDITIONS Unit 3 was shutdown and defueled at the time of discovery on November 27, 2012, as well as during the period of time that the hydraulic fluid was potentially contaminated (October 21 - 23, 2012). There were no additional inoperable structures, systems, or components that contributed to the event. Unit 2 has been shutdown since January 10, 2012, and was unaffected by this event.
C.
BACKGROUND INFORMATION
On October 23, 2012, during engineering walkdowns of the Unit 3 Train A EDG to assess the progress of maintenance work, personnel observed abnormal conditions of the fluid in the sight glass for the EDG 3A Engine #2 governor actuator. The fluid was a purplish color and the level of fluid was higher than normal.
All other Unit 2 and 3 EDGs were walked down and the governor actuator hydraulic fluid levels and color of each were verified normal. An assessment was initiated to determine the cause or causes of the abnormal color and fluid level in the EDG 3A governor actuator. This assessment included testing, document reviews, and personnel interviews.
The contaminated hydraulic fluid was subsequently confirmed by chemical analysis to be used engine coolant (i.e., had been run through an engine). It was also determined that the contamination occurred during the period of time between October 21 and October 23, 2012, based on the fact that Operations performs normal shift walkdowns of the EDG governor and observed the hydraulic fluid color and level to be satisfactory on October 21, 2012. Prior to this walkdown, EDG 3A had been placed in an inoperable condition for a scheduled maintenance outage.
D.
APPARENT CAUSE An apparent cause evaluation is in progress.(10-2010)
U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT (LER)
CONTINUATION SHEET
- 1. FACILITY NAME San Onofre Nuclear Generatin E.
CORRECTIVE ACTIONS
Immediate actions were to initiate an assessment of the event, inspect other credited safe shutdown equipment to verify appropriate state of readiness, and reinstate security access controls for the EDG 3A room. Hydraulic fluid in all engine governors was sampled and the affected mechanical governors were replaced. Interim actions included installation of leak-tight enclosures over the governor housings. These actions provided corrective measures to address potential causes of the event. Additional actions will be addressed upon completion of the assessments.
F.
SAFETY ASSESSMENT
This event did not affect plant operation or safety, since EDG 3A was out of service and not required to be operable during the period of time the governor actuator hydraulic fluid was potentially contaminated. Pre-operational checks and testing would have identified the abnormal condition prior to placing the EDG in service.
Unit 3 has been shutdown since January 31, 2012, due to an unrelated event. Unit 2 has been shutdown since January 10, 2012, and was unaffected by this event.
G.
ADDITIONAL INFORMATION
There have been no similar events in the past three years at SONGS.