05000219/LER-2008-001, Automatic Reactor Shutdown Caused by Main Transformer Failure
| ML090260082 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 01/21/2009 |
| From: | Rausch T Exelon Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RA-09-008 LER 08-001-00 | |
| Download: ML090260082 (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)(iv)(A), System Actuation 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 |
| 2192008001R00 - NRC Website | |
text
Exekrn Oyster Creek Generating Station www.exeloncorp.com Route 9 South Nuclear PO Box 388 Forked River, NJ o8731 10 CFR 50.73 January 21, 2009 RA-09-008 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 2008-001-00, Automatic Reactor Shutdown Caused By Main Transformer Failure Enclosed is Licensee Event Report 2008-001-00, 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 sis needed, please contact Richard Milos, Regulatory'Assurance at 609-971-4973.
Sincerely, Vice President, Oyster Creek Nuclear Generating Station
Enclosure:
NRC Form 366, LER 2008-001-00 cc:
Administrator, USNRC Region I USNRC Project Manager, Oyster Creek USNRC Senior Resident Inspector, Oyster Creek File No. 09035
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007)
, the NRC may digits/characters for each block) not conduct or sponsor, and a person is not required to respond to, the infnrmntinn nnllp.tinn-
- 3. 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 FACILIES INVOLVED I
FACILITY NAME DOCKETNUMBER M N H D Y Y A YE R SEQUENTIAL REV MO T AY Y A IN AN
/A NUMBER NO.
ONTH DAY YEAR N/A IFACILITY NAME DOCKET NUMBER 11 28 12008 2008
- - 001 00 1
21 20091 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)
[I 20.2203(a)(3)(i)
[I 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii)
N [1 20.2201(d)
[I 20.2203(a)(3)(ii)
[I 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(viii)(A)
[o 20.2203(a)(1)
[I 20.2203(a)(4) 0l 50.73(a)(2)(ii)(B)
[0 50.73(a)(2)(viii)(B)
[I 20.2203(a)(2)(i)
[1 50.36(c)(1)(i)(A)
[I 50.73(a)(2)(iii) 0: 50.73(aX2)(ix)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii) 0l 50.36(c)(1)(ii)(A) 0 50.73(a)(2)(iv)(A) 0r' 50.73(a)(2Xx)
[I 20.2203(a)(2)(iii)
[I 50.36(c)(2)
[I 50.73(a)(2)(v)(A) 0 73.71(a)(4) 098 [1 20.2203(a)(2)(iv)
[I.50.46(a)(3)(ii)
[I 50.73(a)(2)(v)(B)
- 0. 73.71(a)(5)
E3 20.2203(a)(2)(v)
[I 50.73(a)(2)(i)(A)
El 50.73(a)(2)(v)(C) 13 OTHER [I 20.2203(a)(2)(vi)
[I 50.73(a)(2)(i)(B)
[I 50.73(a)(2)(v)(D)
Specify in Abstract below or in
- 2.
PM Program is inadequate. Main Power transformer electrical testing frequency was not increased from PCM template minimum frequency as appropriate for a transformer of M1A's age and one displaying M1A's other characteristics, as based upon the 2005 transformer assessment report recommendation and recent industry operating experience. Recent Industry OPEX and other guidance have indicated that Exelon's PCM template frequency for conducting main transformer electrical testing may be inadequate to identify transformer degradation prior to failure.
Corrective Actions
The MIA Main Transformer was replaced with an identical spare unit and the plant returned to power operation on December 6, 2008.
Additional corrective actions center on revising the electrical testing PM frequency, reinforcing system manager roles and responsibilities for decision making, and installation of on-line gas monitors for the two (2) Main Power Transformers.
Previous Occurrences
There have been no similar Licensee Event Report events at Oyster Creek in the last three years.
Component Failure Data
Component: MIA Main Transformer (325 MVA)
Manufacturer: GE (Rewind 1989 by Magnetec)
Serial No.# D577930
Cause
Internal Electrical Fault NRC FORM 306A (9-2007)
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