ENS 44891

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v t e ENS Event
19:40 Mar 4, 2009
Title	Relief Valve Failure Results in Tritium and Cesium Spill
Event Description	At 1100 on March 3rd, 2009 the Main Control Room received a report from the Health Physics Shift Supervisor that 1-BR-RV-114B ( 'B' PG tank heater relief valve) was relieving to the RCA yard near the Primary Grade (PG) tanks. At 1115 an operator confirmed the initial report, stating the relief valve appeared to be full open and relieving at approximately 20 gallons per minute. 0-AP-35.01 (Radioactive Liquid Release Control) was then entered and executed. At 1120 the PG line was then isolated by closing isolation valves, thereby stopping the release. The release amount was then determined per 0-AP-35.01. Using the tank level initial indication of 87.5% taken on operator rounds at 1050 and a final level indication of 87.25%, approximately 450 gallons of water was released. This volume of water coincides with the initial report of an approximate 20 gpm release rate over the 20 minute duration of the event. A sample of the water released was evaluated for tritium and cesium as part of the Nuclear Energy Institute (NEI) Ground Water Protection Initiative. Sample analysis results showed that tritium concentration was 4,810 picoCuries per liter and cesium concentration was 25.1 picoCuries per liter. These concentrations of tritium and cesium pose no threat to employees or the public. Even though the concentrations are well below reportable limits for groundwater, a spill or leak to soil greater than 100 gallons containing licensed material requires that notification be made per VPAP-2103S (Offsite Dose Calculation Manual) as part of our commitment to the NEI Ground Water Protection Initiative. This leak has been contained and relief valve will remain isolated until repaired. This notification is being transmitted due to Notification of Other Government Agencies under 10CFR50.72(b)(2)(xi). The Surry County Administrator was notified. The Senior NRC Resident, Virginia Department of Health, Virginia Department of Emergency Management and Virginia Department of Environmental Quality has or will be notified.

ENS 44891 +/-
Where
Surry Virginia (NRC Region 2)
Reporting

10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
Time - Person (Reporting Time:+-3.78 h-0.158 days <br />-0.0225 weeks <br />-0.00518 months <br />)
Opened:	Thomas Oliver 15:53 Mar 4, 2009
NRC Officer:	Joe O'Hara
Last Updated:	Mar 4, 2009
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v • d • e

v t e Emergency Notification System
Surry with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
WEEKMONTHYEAR2024-05-02T19:05:00 [Table view]
[ENS list for Surry]

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