Information Notice 2009-10, Official Exhibit - NYS000019-00-BD01- NRC Information Notice 2009-10, Transformers Failures - Recent Operating Experience (Jul. 7, 2009) (NRC in 2009-10): Difference between revisions
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{{Adams | |||
| number = ML12334A490 | |||
| issue date = 07/07/2009 | |||
| title = Official Exhibit - NYS000019-00-BD01- NRC Information Notice 2009-10, Transformers Failures - Recent Operating Experience (Jul. 7, 2009) (NRC in 2009-10) | |||
| author name = Dorman D, Mcginty T | |||
| author affiliation = NRC/NMSS/FCSS, NRC/NRR/DPR | |||
| addressee name = | |||
| addressee affiliation = NRC/ASLBP | |||
| docket = 05000247, 05000286 | |||
| license number = | |||
| contact person = SECY RAS | |||
| case reference number = RAS 21523, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01 | |||
| document report number = IN-09-010 | |||
| document type = Legal-Exhibit | |||
| page count = 4 | |||
}} | |||
{{#Wiki_filter:United States Nuclear Regulatory Commission Official Hearing Exhibit NYS000019 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 | |||
!~~ :" | |||
Docket #: 05000247 l 05000286 | |||
~ 0 Exhibit #: NYS000019-00-BD01 Identified: 10/15/2012 | |||
~ ~ | |||
I./l I ' ~ | |||
Admitted: 10/15/2012 Withdrawn: | |||
~ ~ | |||
~1-: | |||
" .*..... ,- | |||
0- Rejected: | |||
Other: | |||
Stricken: | |||
UNITED STATES | |||
NUCLEAR REGULATORY COMMISSION | |||
OFFICE OF NUCLEAR REACTOR REGULATION | |||
OFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS | |||
WASHINGTON, DC 20555-0001 July 7,2009 NRC INFORMATION NOTICE 2009-10: TRANSFORM ER FAI LU RES-RECENT | |||
OPERATI NG EXPERI ENCE | |||
==ADDRESSEES== | |||
All holders of operating licenses for nuclear power reactors under the provisions of Title 10 of | |||
the Code of Federal Regulations (10 CFR) Part 50, "Domestic Licensing of Production and | |||
Utilization Facilities," except those who have ceased operations and have certified that fuel has | |||
been permanently removed from the reactor vessel. All holders of licenses or certificates of fuel | |||
cycle facilities. All holders of and applicants for nuclear power plant construction permits under | |||
the provisions of 10 CFR Part 50. All holders of licenses or certificates for fuel cycle facilities. | |||
==PURPOSE== | |||
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice (IN) to inform | |||
addressees of recent operating experience involving failures of large transformers. The NRC | |||
expects that recipients will review the information for applicability to their facilities and consider | |||
actions, as appropriate, to avoid similar problems. However, suggestions contained in this IN | |||
are not NRC requirements; therefore, no specific action or written response is required. | |||
==DESCRIPTION OF CIRCUMSTANCES== | |||
For several years, available industry operating experience has indicated an increasing trend in | |||
transformer failures, and has provided recommendations to reduce the chances of failure. | |||
Improved preventive maintenance and monitoring practices have helped to identify some | |||
problems before they developed to the point of failure, but the number of large transformers | |||
events has not decreased and in fact continues to rise. The following are relatively recent | |||
examples involving main power transformers: | |||
* Indian Point, Unit 3-0n April 6,2007, while operating at 92-percent power, a fault | |||
occurred on the No. 31 main transformer resulting in an automatic reactor trip and | |||
transformer fire. Licensee Event Report (LER) 50-286/2007-002, which can be found on | |||
the NRC's public Web site using Agencywide Documents Access and Management | |||
System (ADAMS) Accession No. ML071620122, provides additional information. | |||
* River Bend Station-On May 4,2007, an unplanned manual reactor scram was initiated | |||
following the loss of cooling on the No.2 main transformer (see LER 50-458/2007-002, ADAMS Accession No. ML071840161, for more information). | |||
* Grand Gulf Nuclear Station-On January 12, 2008, a manual reactor scram was initiated | |||
following a loss of cooling to the main transformers (see LER 50-416/2008-001, ADAMS | |||
Accession No. ML080700702, for more information). | |||
M L090540218 OAG 10000526_000001 * Limerick Generating Station, Unit 2-0n February 1, 2008, a low voltage bushing | |||
connection failed on the 2A main transformer resulting in a turbine trip and reactor | |||
scram. | |||
* Diablo Canyon, Unit 2-0n August 16,2008, an automatic reactor trip occurred resulting | |||
from the failure of the main electrical transformer C phase. Plant operators | |||
subsequently declared a Notification of Unusual Event due to an observed fire at the | |||
C phase transformer (see LER 50-323/2008-001, ADAMS Accession No. ML082970221, for more information). | |||
* North Anna, Unit 2-0n October 29, 2008, while attempting to place the unit on line, the | |||
turbine tripped on a generator lockout relay actuation. The C main transformer was | |||
discovered to be spraying oil. | |||
* Oyster Creek-On November 28,2008, an electrical fault internal to the M1A main | |||
transformer led to an automatic reactor scram due to load reject. The transformer was | |||
replaced with the spare, and on February 1, 2009, this transformer failed due to a | |||
bushing failure, resulting in a reactor scram, fire, and declaration of a Notification of | |||
Unusual Event (see LER 50-219/2008-001, ADAMS Accession No. ML090260082, and | |||
LER 50-219/2009-001, ADAMS Accession No. ML090970735 for more information). | |||
A review of licensees' root cause evaluations for the large transformer failures shows that the | |||
events are often the result of ineffective implementation of the transformer maintenance | |||
program. | |||
==DISCUSSION== | |||
The events described above illustrate instances in which the loss or tripping of large | |||
transformers resulted in plant transients, reactor trips, unnecessary starting of the emergency | |||
diesel generators (EDGs), and declaration of plant events. Transformer failures have resulted | |||
in eight declared plant events from January, 2007, to February, 2009, making them the second | |||
leading reason for such declarations. While the large transformers discussed in this IN are | |||
generally non-safety related, they are within the scope of the Maintenance Rule (Title 10 of the | |||
Code of Federal Regulations, Section 50.65, "Requirements for Monitoring the Effectiveness of | |||
Maintenance at Nuclear Power Plants"). | |||
A relatively high incidence of transformer failures has occurred in the last few years, the majority | |||
of which could have been avoided had the licensee fully evaluated and effectively implemented | |||
corrective actions and recommendations identified in industry operating experience. These | |||
corrective actions included a more effective maintenance program and a more proactive | |||
approach to addressing abnormal indications. In particular, some utilities have installed online | |||
automated oil analysis and monitoring system to support decisions regarding preventive and | |||
corrective maintenance to improve transformer reliability. The Institute of Electrical and | |||
Electronics Engineers (IEEE) provides industry guidance on this matter in Standard | |||
C57.140-2006, "IEEE Guide for the Evaluation and Reconditioning of Liquid Immersed Power | |||
Transformers." However, it should be noted that the NRC has not endorsed this document, and | |||
the recommendations it contains do not constitute NRC requirements. | |||
OAG 10000526_000002 | |||
==CONTACT== | |||
This IN requires no specific action or written response. Please direct any questions about this | |||
matter to the technical contacts listed below or the appropriate Office of Nuclear Reactor | |||
Regulation (NRR) project manager. | |||
===IRAI IRAI=== | |||
Timothy J. McGinty, Director Daniel H. Dorman, Director | |||
Division of Policy and Rulemaking Division of Fuel Cycle Safety | |||
Office of Nuclear Reactor Regulation and Safeguards | |||
Office of Nuclear Materials Safety | |||
and Safeguards | |||
Technical Contacts: Rebecca Sigmon, NRR/DIRS Prem Sahay, NRR/DE | |||
(301) 415-4018 (301) 415-8439 E-mail: Rebecca.Sigmon@nrc.gov E-mail: Prem.Sahay@nrc.gov | |||
NRC generic communications may be found on the NRC public Web site, httQ:llwww.nrc.gov. | |||
To access this information, select "Electronic Reading Room" and then "Document Collections." | |||
OAG 10000526_000003 | |||
==CONTACT== | |||
This IN requires no specific action or written response. Please direct any questions about this | |||
matter to the technical contacts listed below or the appropriate Office of Nuclear Reactor | |||
Regulation (NRR) project manager. | |||
IRAI IRAI | |||
Timothy J. McGinty, Director Daniel H. Dorman, Director | |||
Division of Policy and Rulemaking Division of Fuel Cycle Safety | |||
Office of Nuclear Reactor Regulation and Safeguards | |||
Office of Nuclear Materials Safety | |||
and Safeguards | |||
Technical Contacts: Rebecca Sigmon, NRR/DIRS Prem Sahay, NRR/DE | |||
(301) 415-4018 (301) 415-8439 E-mail: .R.~.Q§~~§!:.$..i.9f.D.Q!J@!J[~:.9.Qy' E-mail: p..r.§f.D.,$.§!.O.9Y.@.oJ.g:.9Q'y' | |||
NRC generic communications may be found on the NRC public Web site, httr;:rllwww.nrc.gov. | |||
To access this information, select "Electronic Reading Room" and then "Document Collections." | |||
Distribution: IN Reading File | |||
Hard Copy to Elizabeth Doolittle (Mail Stop EBB 6003 1-0 2-M) | |||
ADAMS Accession Number* ML090540218 TAC NO ME0392 OFFICE 10EBIDIRS ACIDIRS/IOEB D/NRRIDIRS TECH EDITOR NRRIDE/EEEB BC/EEEBIDE | |||
NAME RSigmon JThorp FBrown KAzariah-Kribbs PSahay GWilson | |||
DATE 05/08/09 05/13/09 06/02/09 04/03/09 email 05/12/09 05/12/09 OFFICE A/NRRIDE DPR/PGCB DPR/PGCB BCIDPR/PGCB D/NRRIDPR D:FCSS | |||
NAME ABoland DBeaulieu CHawes MMurphy TMcGinty DOorman | |||
DATE 05/18/09 06/03/09 06/03/09 07/01/09 07/07/09 06/19/09 OFFICIAL RECORD COPY | |||
OAG 10000526_000004}} | |||
{{Information notice-Nav}} |
Latest revision as of 20:37, 11 November 2019
ML12334A490 | |
Person / Time | |
---|---|
Site: | Indian Point ![]() |
Issue date: | 07/07/2009 |
From: | Dan Dorman, Mcginty T NRC/NMSS/FCSS, Division of Policy and Rulemaking |
To: | Atomic Safety and Licensing Board Panel |
SECY RAS | |
References | |
RAS 21523, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01 IN-09-010 | |
Download: ML12334A490 (4) | |
United States Nuclear Regulatory Commission Official Hearing Exhibit NYS000019 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
!~~ :"
Docket #: 05000247 l 05000286
~ 0 Exhibit #: NYS000019-00-BD01 Identified: 10/15/2012
~ ~
I./l I ' ~
Admitted: 10/15/2012 Withdrawn:
~ ~
~1-:
" .*..... ,-
0- Rejected:
Other:
Stricken:
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
OFFICE OF NUCLEAR MATERIAL SAFETY AND SAFEGUARDS
WASHINGTON, DC 20555-0001 July 7,2009 NRC INFORMATION NOTICE 2009-10: TRANSFORM ER FAI LU RES-RECENT
OPERATI NG EXPERI ENCE
ADDRESSEES
All holders of operating licenses for nuclear power reactors under the provisions of Title 10 of
the Code of Federal Regulations (10 CFR) Part 50, "Domestic Licensing of Production and
Utilization Facilities," except those who have ceased operations and have certified that fuel has
been permanently removed from the reactor vessel. All holders of licenses or certificates of fuel
cycle facilities. All holders of and applicants for nuclear power plant construction permits under
the provisions of 10 CFR Part 50. All holders of licenses or certificates for fuel cycle facilities.
PURPOSE
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice (IN) to inform
addressees of recent operating experience involving failures of large transformers. The NRC
expects that recipients will review the information for applicability to their facilities and consider
actions, as appropriate, to avoid similar problems. However, suggestions contained in this IN
are not NRC requirements; therefore, no specific action or written response is required.
DESCRIPTION OF CIRCUMSTANCES
For several years, available industry operating experience has indicated an increasing trend in
transformer failures, and has provided recommendations to reduce the chances of failure.
Improved preventive maintenance and monitoring practices have helped to identify some
problems before they developed to the point of failure, but the number of large transformers
events has not decreased and in fact continues to rise. The following are relatively recent
examples involving main power transformers:
- Indian Point, Unit 3-0n April 6,2007, while operating at 92-percent power, a fault
occurred on the No. 31 main transformer resulting in an automatic reactor trip and
transformer fire. Licensee Event Report (LER) 50-286/2007-002, which can be found on
the NRC's public Web site using Agencywide Documents Access and Management
System (ADAMS) Accession No. ML071620122, provides additional information.
- River Bend Station-On May 4,2007, an unplanned manual reactor scram was initiated
following the loss of cooling on the No.2 main transformer (see LER 50-458/2007-002, ADAMS Accession No. ML071840161, for more information).
- Grand Gulf Nuclear Station-On January 12, 2008, a manual reactor scram was initiated
following a loss of cooling to the main transformers (see LER 50-416/2008-001, ADAMS
Accession No. ML080700702, for more information).
M L090540218 OAG 10000526_000001 * Limerick Generating Station, Unit 2-0n February 1, 2008, a low voltage bushing
connection failed on the 2A main transformer resulting in a turbine trip and reactor
- Diablo Canyon, Unit 2-0n August 16,2008, an automatic reactor trip occurred resulting
from the failure of the main electrical transformer C phase. Plant operators
subsequently declared a Notification of Unusual Event due to an observed fire at the
C phase transformer (see LER 50-323/2008-001, ADAMS Accession No. ML082970221, for more information).
- North Anna, Unit 2-0n October 29, 2008, while attempting to place the unit on line, the
turbine tripped on a generator lockout relay actuation. The C main transformer was
discovered to be spraying oil.
- Oyster Creek-On November 28,2008, an electrical fault internal to the M1A main
transformer led to an automatic reactor scram due to load reject. The transformer was
replaced with the spare, and on February 1, 2009, this transformer failed due to a
bushing failure, resulting in a reactor scram, fire, and declaration of a Notification of
Unusual Event (see LER 50-219/2008-001, ADAMS Accession No. ML090260082, and
LER 50-219/2009-001, ADAMS Accession No. ML090970735 for more information).
A review of licensees' root cause evaluations for the large transformer failures shows that the
events are often the result of ineffective implementation of the transformer maintenance
program.
DISCUSSION
The events described above illustrate instances in which the loss or tripping of large
transformers resulted in plant transients, reactor trips, unnecessary starting of the emergency
diesel generators (EDGs), and declaration of plant events. Transformer failures have resulted
in eight declared plant events from January, 2007, to February, 2009, making them the second
leading reason for such declarations. While the large transformers discussed in this IN are
generally non-safety related, they are within the scope of the Maintenance Rule (Title 10 of the
Code of Federal Regulations, Section 50.65, "Requirements for Monitoring the Effectiveness of
Maintenance at Nuclear Power Plants").
A relatively high incidence of transformer failures has occurred in the last few years, the majority
of which could have been avoided had the licensee fully evaluated and effectively implemented
corrective actions and recommendations identified in industry operating experience. These
corrective actions included a more effective maintenance program and a more proactive
approach to addressing abnormal indications. In particular, some utilities have installed online
automated oil analysis and monitoring system to support decisions regarding preventive and
corrective maintenance to improve transformer reliability. The Institute of Electrical and
Electronics Engineers (IEEE) provides industry guidance on this matter in Standard
C57.140-2006, "IEEE Guide for the Evaluation and Reconditioning of Liquid Immersed Power
Transformers." However, it should be noted that the NRC has not endorsed this document, and
the recommendations it contains do not constitute NRC requirements.
OAG 10000526_000002
CONTACT
This IN requires no specific action or written response. Please direct any questions about this
matter to the technical contacts listed below or the appropriate Office of Nuclear Reactor
Regulation (NRR) project manager.
IRAI IRAI
Timothy J. McGinty, Director Daniel H. Dorman, Director
Division of Policy and Rulemaking Division of Fuel Cycle Safety
Office of Nuclear Reactor Regulation and Safeguards
Office of Nuclear Materials Safety
and Safeguards
Technical Contacts: Rebecca Sigmon, NRR/DIRS Prem Sahay, NRR/DE
(301) 415-4018 (301) 415-8439 E-mail: Rebecca.Sigmon@nrc.gov E-mail: Prem.Sahay@nrc.gov
NRC generic communications may be found on the NRC public Web site, httQ:llwww.nrc.gov.
To access this information, select "Electronic Reading Room" and then "Document Collections."
OAG 10000526_000003
CONTACT
This IN requires no specific action or written response. Please direct any questions about this
matter to the technical contacts listed below or the appropriate Office of Nuclear Reactor
Regulation (NRR) project manager.
IRAI IRAI
Timothy J. McGinty, Director Daniel H. Dorman, Director
Division of Policy and Rulemaking Division of Fuel Cycle Safety
Office of Nuclear Reactor Regulation and Safeguards
Office of Nuclear Materials Safety
and Safeguards
Technical Contacts: Rebecca Sigmon, NRR/DIRS Prem Sahay, NRR/DE
(301) 415-4018 (301) 415-8439 E-mail: .R.~.Q§~~§!:.$..i.9f.D.Q!J@!J[~:.9.Qy' E-mail: p..r.§f.D.,$.§!.O.9Y.@.oJ.g:.9Q'y'
NRC generic communications may be found on the NRC public Web site, httr;:rllwww.nrc.gov.
To access this information, select "Electronic Reading Room" and then "Document Collections."
Distribution: IN Reading File
Hard Copy to Elizabeth Doolittle (Mail Stop EBB 6003 1-0 2-M)
ADAMS Accession Number* ML090540218 TAC NO ME0392 OFFICE 10EBIDIRS ACIDIRS/IOEB D/NRRIDIRS TECH EDITOR NRRIDE/EEEB BC/EEEBIDE
NAME RSigmon JThorp FBrown KAzariah-Kribbs PSahay GWilson
DATE 05/08/09 05/13/09 06/02/09 04/03/09 email 05/12/09 05/12/09 OFFICE A/NRRIDE DPR/PGCB DPR/PGCB BCIDPR/PGCB D/NRRIDPR D:FCSS
NAME ABoland DBeaulieu CHawes MMurphy TMcGinty DOorman
DATE 05/18/09 06/03/09 06/03/09 07/01/09 07/07/09 06/19/09 OFFICIAL RECORD COPY
OAG 10000526_000004