PNO-III-10-012, A - Update LaSalle, Units 1 & 2, Leakage of Tritium from Onsite Storage Tank: Difference between revisions
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{{#Wiki_filter:July 22, 2010 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-10-012A | {{#Wiki_filter:July 22, 2010 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-10-012A 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 III staff on this date. | ||
Facility Licensee Emergency Classification LaSalle Units 1 and 2 Notification of Unusual Event Exelon Generation Co. Alert Marseilles, IL Site Area Emergency Docket: 50-373 and 50-374 General Emergency License: NPF-11; NPF-18 X Not Applicable | |||
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 III staff on this date. | |||
Facility LaSalle Units 1 and 2 Exelon Generation Co. Marseilles, IL Docket: 50-373 and 50-374 License: NPF-11; NPF-18 | |||
==SUBJECT:== | ==SUBJECT:== | ||
UPDATE - LEAKAGE OF TRITIUM FROM ONSITE STORAGE TANK | UPDATE - LEAKAGE OF TRITIUM FROM ONSITE STORAGE TANK DESCRIPTION: | ||
On July 1, 2010, Exelons LaSalle Station informed Region III (Chicago) and the State of Illinois of elevated tritium levels onsite in a berm around the plants two condensate storage (CY) tanks. | |||
DESCRIPTION: | Upon inspection, the licensee identified several degraded areas at the base of the Unit 1 CY tank, including three small (less than one-inch each) diameter holes on the bottom of the tank. | ||
The tank has been repaired and was returned to service on July 21, 2010. | |||
On July 1, 2010, | Concentrations of tritium (the radioactive isotope of hydrogen), measured in water from a monitoring well located inside the berm that surrounds the CY tanks, initially were approximately 700,000 picocuries per liter (pCi/L). Following isolation of the leak and repairs to the tank, the measured concentrations of tritium decreased to 163,000 pCi/L as of July 21, 2010. | ||
Other onsite monitoring wells near the CY tank have been sampled daily by the licensee since that leak was identified and have not shown detectable levels of tritium or other radioactivity. | |||
Concentrations of tritium (the radioactive isotope of hydrogen), measured in water from a monitoring well located inside the berm that surrounds the CY tanks, initially were approximately 700,000 picocuries per liter (pCi/L). Following isolation of the leak and repairs to the tank, the measured concentrations of tritium decreased to 163,000 pCi/L as of July 21, 2010. | There is no indication that tritiated water has left the station property. | ||
Other onsite monitoring wells near the CY tank have been sampled daily by the licensee since that leak was identified and have not shown detectable levels of tritium or other radioactivity. There is no indication that tritiated water has left the station property. | |||
Water that was collected from the CY tank berm was transferred into temporary storage containers for future processing. The licensee plans to continue sampling various onsite monitoring points near the CY tank as part of its routine groundwater monitoring program. | Water that was collected from the CY tank berm was transferred into temporary storage containers for future processing. The licensee plans to continue sampling various onsite monitoring points near the CY tank as part of its routine groundwater monitoring program. | ||
There are no indications of leakage from the Unit 2 CY tank at this time. The Unit 2 tank is located adjacent to the Unit 1 tank within the same berm. | There are no indications of leakage from the Unit 2 CY tank at this time. The Unit 2 tank is located adjacent to the Unit 1 tank within the same berm. | ||
The NRC resident inspectors and specialists in the | The NRC resident inspectors and specialists in the NRCs Region III office in Lisle, Illinois closely followed the situation. Agency resident inspectors, who are stationed at the plant, reviewed the impact of the leak and the utilitys repair activities. | ||
The licensee issued News Releases on July 1 and July 22, 2010, regarding the tank leak. The information in this updated preliminary notification has been reviewed with licensee management and is current as of 3:00 p.m. CDT on July 22, 2010. | The licensee issued News Releases on July 1 and July 22, 2010, regarding the tank leak. The information in this updated preliminary notification has been reviewed with licensee management and is current as of 3:00 p.m. CDT on July 22, 2010. | ||
CONTACTS: | CONTACTS: | ||
Wayne Slawinski | Wayne Slawinski Nirodh Shah 630/829-9820 630/829-9821}} | ||
{{PNO-Nav|region=III}} | {{PNO-Nav|region=III}} | ||
Latest revision as of 16:44, 13 November 2019
| ML102030561 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 07/22/2010 |
| From: | Nirodh Shah, Slawinski W NRC/RGN-III |
| To: | |
| References | |
| PNO-III-10-012A | |
| Download: ML102030561 (1) | |
July 22, 2010 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-10-012A 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 III staff on this date.
Facility Licensee Emergency Classification LaSalle Units 1 and 2 Notification of Unusual Event Exelon Generation Co. Alert Marseilles, IL Site Area Emergency Docket: 50-373 and 50-374 General Emergency License: NPF-11; NPF-18 X Not Applicable
SUBJECT:
UPDATE - LEAKAGE OF TRITIUM FROM ONSITE STORAGE TANK DESCRIPTION:
On July 1, 2010, Exelons LaSalle Station informed Region III (Chicago) and the State of Illinois of elevated tritium levels onsite in a berm around the plants two condensate storage (CY) tanks.
Upon inspection, the licensee identified several degraded areas at the base of the Unit 1 CY tank, including three small (less than one-inch each) diameter holes on the bottom of the tank.
The tank has been repaired and was returned to service on July 21, 2010.
Concentrations of tritium (the radioactive isotope of hydrogen), measured in water from a monitoring well located inside the berm that surrounds the CY tanks, initially were approximately 700,000 picocuries per liter (pCi/L). Following isolation of the leak and repairs to the tank, the measured concentrations of tritium decreased to 163,000 pCi/L as of July 21, 2010.
Other onsite monitoring wells near the CY tank have been sampled daily by the licensee since that leak was identified and have not shown detectable levels of tritium or other radioactivity.
There is no indication that tritiated water has left the station property.
Water that was collected from the CY tank berm was transferred into temporary storage containers for future processing. The licensee plans to continue sampling various onsite monitoring points near the CY tank as part of its routine groundwater monitoring program.
There are no indications of leakage from the Unit 2 CY tank at this time. The Unit 2 tank is located adjacent to the Unit 1 tank within the same berm.
The NRC resident inspectors and specialists in the NRCs Region III office in Lisle, Illinois closely followed the situation. Agency resident inspectors, who are stationed at the plant, reviewed the impact of the leak and the utilitys repair activities.
The licensee issued News Releases on July 1 and July 22, 2010, regarding the tank leak. The information in this updated preliminary notification has been reviewed with licensee management and is current as of 3:00 p.m. CDT on July 22, 2010.
CONTACTS:
Wayne Slawinski Nirodh Shah 630/829-9820 630/829-9821