PNO-I-09-002, A: Oyster Creek, Update - Shutdown Greater than 72 Hours: Manual Reactor Scram Following Loss of Cooling to Main Transformer, Dated 05/04/2009: Difference between revisions

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{{#Wiki_filter:DCS No.: 0500021905042009 Date:       May 4, 2009  
{{#Wiki_filter:DCS No.: 0500021905042009 Date:     May 4, 2009 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-09-002A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.
 
Facility                                       Licensee Emergency Classification Exelon Generation Company, LLC                     _ Notification of Unusual Event Oyster Creek                                       _ Alert Forked River, NJ                                     Site Area Emergency Docket: 50-219                                       General Emergency X   Not Applicable
PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-09-002A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.
Facility     Licensee Emergency Classification Exelon Generation Company, LLC       _ Notification of Unusual Event Oyster Creek                             _   Alert Forked River, NJ           Site Area Emergency Docket: 50-219             General Emergency       X     Not Applicable  


==Subject:==
==Subject:==
UPDATE - SHUTDOWN GREATER THAN 72 HOURS: MANUAL REACTOR SCRAM FOLLOWING LOSS OF COOLING TO MAIN TRANSFORMER This preliminary notification supplements information in PNO-I-09-002, which documented a manual reactor scram due to a loss of cooling to one of its main transformers at the Oyster Creek Generating Station on April 25.  
UPDATE - SHUTDOWN GREATER THAN 72 HOURS: MANUAL REACTOR SCRAM FOLLOWING LOSS OF COOLING TO MAIN TRANSFORMER This preliminary notification supplements information in PNO-I-09-002, which documented a manual reactor scram due to a loss of cooling to one of its main transformers at the Oyster Creek Generating Station on April 25.
 
At 6:36 p.m., on May 2, Oyster Creek commenced start up and the reactor became critical at 10:46 p.m. Currently, the main generator is synchronized to the grid and the plant is holding power at 70% until replacement of the C feed water pump motor is completed. The NRC resident staff monitored plant start up and continues to assess licensee activities.
At 6:36 p.m., on May 2, Oyster Creek commenced start up and the reactor became critical at 10:46 p.m. Currently, the main generator is synchronized to the grid and the plant is holding power at 70% until replacement of the 'C' feed water pump motor is completed. The NRC resident staff monitored plant start up and continues to assess licensee activities.  
The cause of the loss of cooling to the main transformer which resulted in the manual reactor scram was a failed auxiliary control power transformer which supplied power to the main transformers oil pumps and fans control circuitry. During the shutdown, Exelon replaced the auxiliary control power transformer and made additional modifications to the power supply logic for both main transformers. Exelon also performed maintenance on the A feedwater system and began activities to replace the C feedwater pump motor.
 
Exelon continues its investigation into the source of tritium in water identified in a cable vault on April 16 (NRC Event Number 44993). Sections of two underground condensate transfer pipes identified with leaks were replaced prior to restart. Exelon continues to perform daily samples of water from on-site sampling wells, the plants intake and discharge canals. Sampling has not shown any detectable levels of tritium off-site. Exelon is also making plans to inspect the condensate storage tank. The NRC staff is onsite and continues to closely monitor Exelons investigation and environmental sampling for tritium.
The cause of the loss of cooling to the main transformer which resulted in the manual reactor scram was a failed auxiliary control power transformer which supplied power to the main transformer's oil pumps and fans control circuitry. During the shutdown, Exelon replaced the auxiliary control power transformer and made additional modifications to the power supply logic for both main transformers. Exelon also performed maintenance on the "A" feedwater system and began activities to replace the "C" feedwater pump motor.
Exelon continues its investigation into the source of tritium in water identified in a cable vault on April 16 (NRC Event Number 44993). Sections of two underground condensate transfer pipes identified with leaks were replaced prior to restart. Exelon continues to perform daily samples of water from on-site sampling wells, the plant's intake and discharge canals. Sampling has not shown any detectable levels of tritium off-site. Exelon is also making plans to inspect the condensate storage tank. The NRC staff is onsite and continues to closely monitor Exelon's investigation and environmental sampling for tritium.
The information contained in the preliminary notification has been verified with Exelon (P.
The information contained in the preliminary notification has been verified with Exelon (P.
Orphanos, Plant Manager) and is current as of May 4, 2009 at 11:15 a.m.
Orphanos, Plant Manager) and is current as of May 4, 2009 at 11:15 a.m.
The NRC continues to keep the State of New Jersey informed of this issue.
The NRC continues to keep the State of New Jersey informed of this issue.
Region I Public Affairs is prepared to respond to media inquiries.  
Region I Public Affairs is prepared to respond to media inquiries.
 
This preliminary notification is issued for information only.
This preliminary notification is issued for information only.
ADAMS Accession Number:  ML091240417 Contacts: R. Bellamy      (610) 337-5200  Ronald.Bellamy@nrc.gov
DISTRIBUTIONS
: BY E-MAIL: OWFN        TWFN    Chairman Klein Comm. Svinicki  NMSS Comm. Jaczko    OIG Comm. Lyons      RES OIP OCA OGC EDO OE NRR SECY Regional Offices
BY FAX:
DOT:Trans INPO NSAC RI Resident Office Licensee: Exelon Generating Company, LLC Oyster Creek Nuclear Generating Station
SUNSI Review Complete:    mferdas*              (Reviewer's Initials)


DOCUMENT NAME:  G:\DRP\PNs\PNO-I-09-002A -.doc After declaring this document "An Official Agency Record" it will be released to the Public.
ADAMS Accession Number: ML091240417 Contacts:  R. Bellamy (610) 337-5200 Ronald.Bellamy@nrc.gov
To receive a copy of this document, indicate in the box: 
" C" = Copy without attachment/enclosure  " E" = Copy with attachment/enclosure 
" N" = No copy                  ML091240417 OFFICE RI/DRP  RI/DRS  RI/POA  RI/ORA RI/DRP  NAME RBellamy/rrb* JWhite/jrw* DScrenci/dps* NMcNamara/nmc* JClifford/dcl for DATE 05/04/09 05/04/09 05/04/09 05/04/09 05/04/09
*See prior concurrence OFFICIAL RECORD COPY


Region I Form 83 (Rev. July 2, 2003)}}
DISTRIBUTIONS:
BY E-MAIL:
OWFN                                          TWFN Chairman Klein Comm. Svinicki                    NMSS Comm. Jaczko                                  OIG Comm. Lyons                                    RES OIP OCA OGC EDO OE NRR SECY Regional Offices BY FAX:
DOT:Trans INPO NSAC RI Resident Office Licensee: Exelon Generating Company, LLC Oyster Creek Nuclear Generating Station SUNSI Review Complete:                    mferdas*                  (Reviewers Initials)
DOCUMENT NAME: G:\DRP\PNs\PNO-I-09-002A -.doc After declaring this document An Official Agency Record it will be released to the Public.
To receive a copy of this document, indicate in the box: "C" = Copy without attachment/enclosure "E" = Copy with attachment/enclosure "N" = No copy ML091240417 OFFICE      RI/DRP                RI/DRS                  RI/POA                RI/ORA                RI/DRP NAME          RBellamy/rrb*          JWhite/jrw*            DScrenci/dps*        NMcNamara/nm JClifford/dcl for c*
DATE        05/04/09                05/04/09              05/04/09              05/04/09              05/04/09
*See prior concurrence                              OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)}}


{{PNO-Nav|region=I}}
{{PNO-Nav|region=I}}

Revision as of 06:24, 14 November 2019

PNO-I-09-002A: Oyster Creek, Update - Shutdown Greater than 72 Hours: Manual Reactor Scram Following Loss of Cooling to Main Transformer, Dated 05/04/2009
ML091240417
Person / Time
Site: Oyster Creek
Issue date: 05/04/2009
From: Ronald Bellamy
NRC/RGN-I/DRP/PB6
To:
bellamy r
References
PNO-I-09-002A
Download: ML091240417 (3)
v • d • e


DCS No.: 0500021905042009 Date: May 4, 2009 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-I-09-002A This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.

Facility Licensee Emergency Classification Exelon Generation Company, LLC _ Notification of Unusual Event Oyster Creek _ Alert Forked River, NJ Site Area Emergency Docket: 50-219 General Emergency X Not Applicable

Subject:

UPDATE - SHUTDOWN GREATER THAN 72 HOURS: MANUAL REACTOR SCRAM FOLLOWING LOSS OF COOLING TO MAIN TRANSFORMER This preliminary notification supplements information in PNO-I-09-002, which documented a manual reactor scram due to a loss of cooling to one of its main transformers at the Oyster Creek Generating Station on April 25.

At 6:36 p.m., on May 2, Oyster Creek commenced start up and the reactor became critical at 10:46 p.m. Currently, the main generator is synchronized to the grid and the plant is holding power at 70% until replacement of the C feed water pump motor is completed. The NRC resident staff monitored plant start up and continues to assess licensee activities.

The cause of the loss of cooling to the main transformer which resulted in the manual reactor scram was a failed auxiliary control power transformer which supplied power to the main transformers oil pumps and fans control circuitry. During the shutdown, Exelon replaced the auxiliary control power transformer and made additional modifications to the power supply logic for both main transformers. Exelon also performed maintenance on the A feedwater system and began activities to replace the C feedwater pump motor.

Exelon continues its investigation into the source of tritium in water identified in a cable vault on April 16 (NRC Event 44993). Sections of two underground condensate transfer pipes identified with leaks were replaced prior to restart. Exelon continues to perform daily samples of water from on-site sampling wells, the plants intake and discharge canals. Sampling has not shown any detectable levels of tritium off-site. Exelon is also making plans to inspect the condensate storage tank. The NRC staff is onsite and continues to closely monitor Exelons investigation and environmental sampling for tritium.

The information contained in the preliminary notification has been verified with Exelon (P.

Orphanos, Plant Manager) and is current as of May 4, 2009 at 11:15 a.m.

The NRC continues to keep the State of New Jersey informed of this issue.

Region I Public Affairs is prepared to respond to media inquiries.

This preliminary notification is issued for information only.

ADAMS Accession Number: ML091240417 Contacts: R. Bellamy (610) 337-5200 Ronald.Bellamy@nrc.gov

DISTRIBUTIONS:

BY E-MAIL:

OWFN TWFN Chairman Klein Comm. Svinicki NMSS Comm. Jaczko OIG Comm. Lyons RES OIP OCA OGC EDO OE NRR SECY Regional Offices BY FAX:

DOT:Trans INPO NSAC RI Resident Office Licensee: Exelon Generating Company, LLC Oyster Creek Nuclear Generating Station SUNSI Review Complete: mferdas* (Reviewers Initials)

DOCUMENT NAME: G:\DRP\PNs\PNO-I-09-002A -.doc After declaring this document An Official Agency Record it will be released to the Public.

To receive a copy of this document, indicate in the box: "C" = Copy without attachment/enclosure "E" = Copy with attachment/enclosure "N" = No copy ML091240417 OFFICE RI/DRP RI/DRS RI/POA RI/ORA RI/DRP NAME RBellamy/rrb* JWhite/jrw* DScrenci/dps* NMcNamara/nm JClifford/dcl for c*

DATE 05/04/09 05/04/09 05/04/09 05/04/09 05/04/09

  • See prior concurrence OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)
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