RA-09-026, Official Exhibit - NYS000024-00-BD01 - Exelon Nuclear (RA-09-026), Licensee Event Report 2009-001-00, Automatic Reactor Shutdown Caused by Main Transformer Failure, Oyster Creek Nuclear Generating Station (Mar. 31, 2009)

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Official Exhibit - NYS000024-00-BD01 - Exelon Nuclear (RA-09-026), Licensee Event Report 2009-001-00, Automatic Reactor Shutdown Caused by Main Transformer Failure, Oyster Creek Nuclear Generating Station (Mar. 31, 2009)
ML12334A487
Person / Time
Site: Indian Point  Entergy icon.png
Issue date: 03/31/2009
From: Rausch T
Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
SECY RAS
References
RAS 21523, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01, RA-09-026 LER-09-001-00
Download: ML12334A487 (4)
v • d • e


Text

United States Nuclear Regulatory Commission Official Hearing Exhibit NYS000024 Entergy Nuclear Operations, Inc.

In the Matter of:

(Indian Point Nuclear Generating Units 2 and 3) Submitted: December 12, 2011 u....~p..p. REG(J~)- ASLBP #: 07-858-03-LR-BD01

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Docket #: 05000247 l 05000286

~ 0 Exhibit #: NYS000024-00-BD01 Identified: 10/15/2012

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Admitted: 10/15/2012 Withdrawn:

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0- Rejected:

Other:

Stricken:

Oyster (reek Generating Station Route 9 South www.exeloncorp.com Nuclear PO Box 388 Forked River, NJ 08731 10 CFR 50.73 March 31, 2009

, RA-09-026 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 - 0001 Oyster Creek Nuclear Generating Station Facility Operating License No. DPR-16 NRC Docket No. 50-219

Subject:

Licensee Event Report 2009-001-00, Automatic Reactor Shutdown Caused by Main Transformer Failure Enclosed is Licensee Event Report 2009-001-00, Automatic Reactor Shutdown Caused by Main Transformer Failure. This event did not affect the health and safety of the public or plant personnel. This event did not result in a safety system functional failure. There are no new regulatory commitments made in this LER submittal.

If any further information or assistance is needed, please contact James Barstow, Regulatory Assurance Manager at 609-971-4947.

Sincerely, C)(

T.S. Rausch Vice President, Oyster Creek Nuclear Generating Station

Enclosure:

NRC Form 366, LER 2009-001-00 cc: Administrator, USNRC Region I USNRC Project Manager, Oyster Creek USNRC Senior Resident Inspector, Oyster Creek File No. 09052 OAG10001040_00001

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OM8: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007)

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 FOIAlPrivacy Service Branch (T-5 F52), U.S.

LICENSEE EVENT REPORT (LER) Nuclear Re~ulatory Commission, Washington, DC 20555-0001, or b internet h

e-mail to in ocollects@nrc.gov, and to the Desk Officer, Office of In ormation and Regulatory Affairs, NEOB-10202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information (See reverse for required number of collection does not display a currently valid OMB control number, the NRC may r'

digits/characters for each block) not conduct or sponsor, and a person is not required to respond to, the informAlion coIlAr.lion.

1. FACILITY NAME 2. DOCKET NUMBER PAGE Oyster Creek, Unit 1 05000219 1 OF 3
4. TITLE Automatic Reactor Shutdown Caused by Main Transformer Failure
5. EVENT DATE 6. LER NUMBER 7. REPORT DATE 8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR I SEQUENTIAL I REV NUMBER NO.

MONTH DAY YEAR FACILITY NAME N/A DOCKET NUMBER N/A FACILITY NAME DOCKET NUMBER 02 01 2009 2009 001 00 03 31 2009 N/A N/A

9. OPERATING MODE 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) o 20.2201 (b) o 20.2203(a)(3)(i) o 50.73(a)(2)(i)(C) o 50.73(a)(2)(vii)

N' o 20.2201 (d) o 20.2203(a)(3)(ii) o 50.73(a)(2)(ii)(A) o 50.73(a)(2)(viii)(A) o 20.2203(a)(1) o 20.2203(a)(4) o 50.73(a)(2)(ii)(B) o 50.73(a)(2)(viii)(B) o 20.2203(a)(2)(i) o 50.36(c)(1 )(i)(A) o 50.73(a)(2)(iii) o 50.73(a)(2)(ix)(A)

10. POWER LEVEL o 20.2203(a)(2)(ii) o 50.36(c)(1 )(ii)(A) IZI 50.73(a)(2)(iv)(A) o 50.73(a)(2)(x) o 20.2203(a)(2)(iii) o 50.36(c)(2) o 50.73(a)(2)(v)(A) o 73.71 (a)(4) 100 o 20.2203(a)(2)(iv) o 50.46(a)(3)(ii) o 50.73(a)(2)(v)(B) o 73.71 (a)(5) o 20.2203(a)(2)(v) o 50.73(a)(2)(i)(A) o 50.73(a)(2)(v)(C) o OTHER o 20.2203(a)(2)(vi) o 50.73(a)(2)(i)(B) o 50.73(a)(2)(v)(D) Specify in Abstract below or in NRC Form 366A
12. LICENSEE CONTACT FOR THIS LER FACILITY NAME ITELEPHONE NUMBER (Include Area Code)

James Barstow, Regulatory Assurance Manager (609) 971-4947

13. COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT MANU- REPORTABLE MANU- REPORTABLE CAUSE SYSTEM COMPONENT CAUSE SYSTEM COMPONENT FACTURER TO EPIX FACTURER TO EPIX X EL XFMR GOaO y N/A N/A N/A N/A N/A
14. SUPPLEMENTAL REPORT EXPECTED 15. EXPECTED MONTH DAY YEAR SUBMISSION o YES (If yes, complete 15. EXPECTED SUBMISSION DATE) ~NO DATE N/A N/A N/A ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)

On February 1, 2009 the Oyster Creek Generating Station was operating at 100% reactor power, 661 Megawatts Electric (MWE). Oyster Creek had been online for 56 days following the 1F17 Forced Outage due to the M1 A transformer failure on November 28, 2008.

At 2156 hours0.025 days <br />0.599 hours <br />0.00356 weeks <br />8.20358e-4 months <br />, Oyster Creek's main generator tripped due to the actuation of the 230kV bus section differential relay due to the failure of the M1 A main power transformer. This caused a load reject SCRAM that automatically shut down the reactor. The transformer failure led to the declaration of an Unusual Event at 2211 hours0.0256 days <br />0.614 hours <br />0.00366 weeks <br />8.412855e-4 months <br />, based on a fire lasting greater than 15 minutes affecting the M1 A transformer. The fire was extinguished at 2227 hours0.0258 days <br />0.619 hours <br />0.00368 weeks <br />8.473735e-4 months <br /> and the Unusual Event was terminated at 2337 hours0.027 days <br />0.649 hours <br />0.00386 weeks <br />8.892285e-4 months <br /> on February 1,2009.

There were no nuclear safety consequences impacting plant or public safety as a result of this event.

This event is being reported pursuant to 10CFR50.73(a)(2)(iv)(A) due to the automatic reactor protection system actuation.

NRC FORM 366 (9-2007)

OAG10001040_00002

NRC FORM 366A LICENSEE EVENT REPORT (LER) u.s. NUCLEAR REGULATORY COMMISSION (9*2007)

CONTINUATION SHEET

1. FACILITY NAME 2. DOCKET 6. LER NUMBER 3. PAGE Oyster Creek, Unit 1 05000219 YEAR I SEQUENTIAL NUMBER I REV NO.

2 OF 3 2009 001 00 NARRATIVE Plant Condition Prior to Event Event Date: February 1, 2009 Event Time: 2156 Unit 1 Mode: Power Operation Power Level: 100%

Description of Event Note: Energy Industry Identification System (EllS) codes are identified in the following text in brackets as [XX].

On February 1, 2009 the Oyster Creek Generating Station was operating at 100% reactor power, 661 Megawatts Electric. Oyster Creek had been online for 56 days following the 1F17 Forced Outage on the M1 A transformer failure on November 28, 2008.

At 2156 hours0.025 days <br />0.599 hours <br />0.00356 weeks <br />8.20358e-4 months <br />, Oyster Creek's main generator [GEN] tripped due to the actuation of the 230kV bus section differential relay [87] due to the failure of the M1A main power transformer [XFMR]. This caused a load reject SCRAM that automatically shut down the reactor [RCT]. The transformer failure led to the declaration of an Unusual Event at 2211 hours0.0256 days <br />0.614 hours <br />0.00366 weeks <br />8.412855e-4 months <br />, based on a fire lasting greater than 15 minutes affecting the M1A transformer. As required, the Shift Emergency Director completed immediate notifications. The deluge system actuated as expected and off-site fire responders were called in to assist. The fire was extinguished at 2227 hours0.0258 days <br />0.619 hours <br />0.00368 weeks <br />8.473735e-4 months <br /> and the Unusual Event was terminated at 2337 hours0.027 days <br />0.649 hours <br />0.00386 weeks <br />8.892285e-4 months <br /> on February 1,2009.

Analysis of Event:

A review of the grid disturbance report provided by Jersey Central Power & Light and th.e digital fault recorder in the switchyard showed that there were no abnormalities in the grid on or before the time of failure. However, the digital protective relay system data, differential current and voltage data, visual inspections, and post failure test indicate that the failure occurred at the '8' phase high voltage (HV) bushing of the M1 A transformer.

The plant responded as designed and operator action was prompt and appropriate. The transient was within the design basis of the plant and had no nuclear safety significance.

After the fire on the M~ 1A transformer was extinguished, an immediate visual inspection shbwed that a catastrophic failure of the '8' HV bushing had occurred. Upon further inspections* after the '8' HV bushing was removed from the transformer, there was evidence that there had been a phase-to-ground fault on the '6' HV bushing main conductor and that it had faulted to ground through the ground sleeve of the bushing. This fault occurred about 10.5 inches below the bushing-mounting flange and approx three inches above the current transformers internal to the housing of the '6' phase bushing. .

Cause of Event:

A catastrophic failure of the '6' HV bushing on M1A Main Power Transformer led to a reactor automatic shutdown due to a load reject SCRAM.

NRC FORM 366A (9*2007)

OAG10001040_00003

NRC FORM 366A LICENSEE EVENT REPORT (LER) u.s. NUCLEAR REGULATORY COMMISSION (9*2007)

CONTINUATION SHEET

1. FACILITY NAME 2. DOCKET 6. LER NUMBER 3. PAGE Oyster Creek, Unit 1 05000219 YEAR I SEQUENTIAL NUMBER J REV NO.

3 OF 3 2009 - 001 - 00 NARRATIVE Corrective Actions:

The M1A Main Transformer was replaced with a transformer obtained from another Exelon generating station.

The long-term corrective action is to replace both main transformers (M1 A and M1 B) with new units during the next refueling outage, scheduled for the fourth quarter of 2010.

Previous Occurrences This is the second failure of a main power transformer at Oyster Creek in less than three months, however, the November 28, 2008 M1 A failure resulted from a 'B' phase internal winding fault unrelated to this most recent failure.

Component Failure Data Component: M1 A Main Transformer (325 MVA)

Manufacturer: GE (Rewind 1989-90 by GE Philadelphia)

Serial No.# 0577931 Cause: High Voltage Bushing Failure NRC FORM 366A (9*2007)

OAGI0001040_00004

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