ENS 52575

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v t e ENS Event
18:45 Feb 24, 2017
Title	Offsite Notification to State of Wisconsin Due to Inadvertent Release of Contaminated Water
Event Description	The Wisconsin Department of Natural Resources (WDNR) was notified today at 1245 [CST] of an inadvertent release of radioactively contaminated water [as required by the licensee's site permit to report any release of contaminated water into the Mississippi River]. At approximately 0715 on February 23, 2017, Solutions Management was notified by a Radiation Protection Technician (RPT) that the containment berm of the East (immediately north of Turbine Building) Baker Tank (20,000 gallon storage tank) was full and spilling out of the containment berm. The water that spilled out of the containment berm had pooled to the north of the tank and eventually began draining into the Radiological Controlled Area (RCA) storm sewer drain. Upon discovery and initial investigation the RPT ascertained that a sump pump hose which was left in the tank overnight was siphoning into the containment berm. The RPT immediately removed the hose from the water in the Baker Tank to stop the water from siphoning. Once the water was secured actions were taken [to minimize the contamination]. Approximately 400 gallons had been lost from the tank. The 400 gallons was siphoned from the tank through a garden hose attached to a sump pump which was sitting in the containment berm. Over the course of approximately 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> the water siphoning from the tank filled the containment berm which holds a little over 3,100 gallons and spilled on to an asphalt surface. The water then traveled approximately 30 feet over the asphalt surface to the storm sewer which contained inlet protection in accordance with the Storm Water Pollution Prevention Plan. After filtering through the inlet protection the water remained in the storm water drain until the volume was sufficient enough to reach the 10 inch discharge piping (approximately 12 inches). The water traveled approximately 100 feet to the next storm water drain where it remained until the volume was sufficient enough to reach the 10 inch discharge piping (approximately 8 inches). When the manhole was opened, the level of the water was just above the bottom of the 10 inch discharge piping and was flowing slowly. The water leaving the 10 inch discharge piping flowed to a 60 inch discharge pipe that discharges to the Mississippi River. Water samples and smear surveys were analyzed, documented and reviewed by the Lacrosse Solutions (Solutions) Radiation Protection Manager (RPM) and NRC Region 3 Inspector Dr. Peter Lee, who was on site performing a routine inspection. Analytical results of the released water showed that it contained only Cs-137 in concentrations ranging from 1.1E-06 uCi/ml to 2.86 E-06 uCi/ml. The concentration levels exceed the 10CFR20 Table 2 limits for effluents (water) for Cs-137 which is 1 E-06 uCi/ml. The concentration levels exceed the 10CFR20 Table 2 limits for effluents(water) for Cs-137 which is 1 E-06 uCi/ml. Although the concentration levels exceed the 10CFR20 Table 2 limits for effluents (water) for Cs-137 they did not exceed the criteria for reportability which is 20 times the Table 2 effluent limit for Cs-137. The smear surveys of the storm sewer piping, manhole vaults taken during entries into the RCA yard drain & Administration Building drain manholes were all considerably less than CA posting criteria. The Standard Dose Calculations used for planned water releases were utilized for the water release assuming no dilution. Using the Standard Dose Calculations it was calculated that 1.05 E-02 mRem was the worst case for organs and 5.72E-03 mRem for total body dose. Following the RPM's review, it was determined that the asphalt area of the RCA could be down posted as a CA and the storm drain vault to the north of the Administration Building could be unplugged to allow regular flow of storm water. Solution's has issued a Conditions Report (CR) and initiated an investigation to prevent this occurrence from happening again. Regulatory reportability limits for liquid effluent releases were not exceed as result of this event.

ENS 52575 +/-
Where
Lacrosse File:Dairyland Power Cooperative icon.png Wisconsin (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
Time - Person (Reporting Time:+-4.08 h-0.17 days <br />-0.0243 weeks <br />-0.00559 months <br />)
Opened:	Cheryl Olson 14:40 Feb 24, 2017
NRC Officer:	Jeff Rotton
Last Updated:	Feb 24, 2017
52575 - NRC Website
v • d • e

v t e Emergency Notification System
La Crosse File:Dairyland Power Cooperative icon.png with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
WEEKMONTHYEAR2018-03-13T05:00:00 [Table view]
[ENS list for La Crosse]

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