Event Notification Report for August 25, 2017
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/24/2017 - 08/25/2017
Power Reactor
Event Number: 52927
Facility: THREE MILE ISLAND
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP
NRC Notified By: TANYA BELLAY
HQ OPS Officer: DONG HWA PARK
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] B&W-L-LP
NRC Notified By: TANYA BELLAY
HQ OPS Officer: DONG HWA PARK
Notification Date: 08/25/2017
Notification Time: 14:42 [ET]
Event Date: 08/25/2017
Event Time: 11:15 [EDT]
Last Update Date: 08/25/2017
Notification Time: 14:42 [ET]
Event Date: 08/25/2017
Event Time: 11:15 [EDT]
Last Update Date: 08/25/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
SILAS KENNEDY (R1DO)
SILAS KENNEDY (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
OFFSITE NOTIFICATION DUE TO EXCEEDING CHLORINE EFFLUENT LIMIT
"On August 24, 2017 a malfunction internal to the River Water Chemistry Control System resulted in measurable free available chlorine levels over a one-hour period at the station outfall to the Susquehanna River. The chlorine levels exceeded the station NPDES [National Pollutant Discharge Elimination System] permit effluent limitations. The River Water Chemistry Control System was shutdown until the condition is corrected.
"The concentrations released did not threaten the downstream users or the environment. Pennsylvania Department of Environmental Protection was notified of the NPDES non-compliance on August 25, 2017 at 1115 [EDT].
"Pursuant to 10 CFR 50.72(b)(2)(xi), this notification satisfies the requirement to notify the NRC of the occurrence of any event or situation related to the health and safety of the public or onsite personnel, or protection of the environment, for which notification to the other government agencies has been made.
"The NRC Resident Inspector has been notified."
Notified DOE, EPA, USDA, HHS, and FEMA.
"On August 24, 2017 a malfunction internal to the River Water Chemistry Control System resulted in measurable free available chlorine levels over a one-hour period at the station outfall to the Susquehanna River. The chlorine levels exceeded the station NPDES [National Pollutant Discharge Elimination System] permit effluent limitations. The River Water Chemistry Control System was shutdown until the condition is corrected.
"The concentrations released did not threaten the downstream users or the environment. Pennsylvania Department of Environmental Protection was notified of the NPDES non-compliance on August 25, 2017 at 1115 [EDT].
"Pursuant to 10 CFR 50.72(b)(2)(xi), this notification satisfies the requirement to notify the NRC of the occurrence of any event or situation related to the health and safety of the public or onsite personnel, or protection of the environment, for which notification to the other government agencies has been made.
"The NRC Resident Inspector has been notified."
Notified DOE, EPA, USDA, HHS, and FEMA.
Agreement State
Event Number: 52990
Rep Org: PA BUREAU OF RADIATION PROTECTION
Licensee: US STEEL CORPORATION - CLAIRTON WORKS
Region: 1
City: CLAIRTON State: PA
County:
License #: PA-1280
Agreement: Y
Docket:
NRC Notified By: JOSEPH MELNIC
HQ OPS Officer: DONALD NORWOOD
Licensee: US STEEL CORPORATION - CLAIRTON WORKS
Region: 1
City: CLAIRTON State: PA
County:
License #: PA-1280
Agreement: Y
Docket:
NRC Notified By: JOSEPH MELNIC
HQ OPS Officer: DONALD NORWOOD
Notification Date: 09/25/2017
Notification Time: 08:23 [ET]
Event Date: 08/25/2017
Event Time: 00:00 [EDT]
Last Update Date: 09/25/2017
Notification Time: 08:23 [ET]
Event Date: 08/25/2017
Event Time: 00:00 [EDT]
Last Update Date: 09/25/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
FRED BOWER (R1DO)
NMSS_EVENTS_NOTIFICA (EMAI)
FRED BOWER (R1DO)
NMSS_EVENTS_NOTIFICA (EMAI)
AGREEMENT STATE REPORT - STUCK / BROKEN SHUTTER
The following information was received via email:
"On September 22, 2017, the licensee informed the Department [PA DEP Bureau of Radiation Protection] of a failure of a collimator block. This event is reportable per 10 CFR 30.50(b)(2).
"On August 25, 2017, the licensee identified a failure of the collimator block attached to the shutter assembly on one of its Thermo Measure Tech Model 5204 gauges containing 4 curies of Cesium-137. The gauge was immediately removed from service. A licensed service provider was contacted and the broken shutter mechanism was removed and replaced with a spare. The shutter mechanism was then tested and confirmed as operating properly. Survey results indicated no abnormal amounts of radiation in the area before or after the repair work. All regulatory precautions were taken and no overexposures occurred.
"The cause of the event was equipment failure. The Department will perform a reactive inspection. A service provider has already corrected the problem. More information will be provided upon receipt."
PA Event Report ID No.: PA170013
The following information was received via email:
"On September 22, 2017, the licensee informed the Department [PA DEP Bureau of Radiation Protection] of a failure of a collimator block. This event is reportable per 10 CFR 30.50(b)(2).
"On August 25, 2017, the licensee identified a failure of the collimator block attached to the shutter assembly on one of its Thermo Measure Tech Model 5204 gauges containing 4 curies of Cesium-137. The gauge was immediately removed from service. A licensed service provider was contacted and the broken shutter mechanism was removed and replaced with a spare. The shutter mechanism was then tested and confirmed as operating properly. Survey results indicated no abnormal amounts of radiation in the area before or after the repair work. All regulatory precautions were taken and no overexposures occurred.
"The cause of the event was equipment failure. The Department will perform a reactive inspection. A service provider has already corrected the problem. More information will be provided upon receipt."
PA Event Report ID No.: PA170013