ML060960636
| ML060960636 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 11/30/2005 |
| From: | - No Known Affiliation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0115, FOIA/PA-2010-0209 | |
| Download: ML060960636 (9) | |
Text
1.f
(
(?
(
Braidwood Station Tritium Monitoring Update to NRC and IEMA November 2005
((
(
Topics
- B ackground
- May 2005 Sampling Results
- Development of Extended Sampling Plan
- Expanded Sampling and Characterization
- November 2005 Sampling Results
- Current Actions 2
(
(
(v
Background
Identified on-site low level tritium in storm water drainage ditch in northwest portion of property
- 04/01/05 (539 pCi/L)
- Background approximately 200-300 pCi/i Communications NRC, IEMA, IEPA
- Tracked back to area east of switchyard
- Increased existing sampling frequency of ditch
- Developed additional sampling plan
- Included installation of new monitoring wells
- Visual inspection of vacuum breaker pits 3
Background Cont'd May 2005 on site vacuum breaker pit inspection Vacuum Breaker #1 Leakage identified during observation
- Approximately 20 drops per minute
- Isolated immediately d
- Pit sample 51295 pCi/L Vacuum Breaker #2
- Showed no active leakage Vacuum Breaker #3
- Identified standing water in Pit
- Sample result - 1521 pCi/L
- No apparent leakage - likely from groundwater a/
4
Development of Extended Sampling Plan
- Developed with assistance from professional environmental hydrologist (June 2005)
- Installed additional sampling wells & established sampling frequency 8 wells installed
- Located to identify potential sources and pathways Sampling began late September through late October 2005
- Initial results
- Elevated tritium in two wells (MW-103 and 113)
- Maximum 4480 pCi/L at MW-1 13; north of Vacuum Breaker 2 5
9
Expanded Sampling & Characterization
- Multi-disciplined team developed On-site & off-site Exelon resources Contractor specialists Senior management leadership
- Objectives of team Identify historical and current sources Determine reportability requirements Identification of potential remediation options Development of communication strategy
^
6
Expanded Sampling Cont'd
- Characterized relevant historical leakage areas Vacuum Breaker 3 (1998)
Vacuum Breaker 2 (2000)
Vacuum Breaker 1 (2005)
- Installed sampling wells along blowdown line to check for active leakage on site property Approximate 100 foot increments where access permitted
- Additional sampling wells established around vacuum breakers and historical leaks Includes property line along Smiley Road 7
Ca
(
C November 2005 Sampling Results Areas affected by vacuum breaker leaks Sampling in area of Vacuum Breaker 3
- 729 - 58489 pCi/I Sampling in area of Vacuum Breaker 2
- 207 - 6193 pCi/I Sampling in area of Vacuum Breaker 1
- 206-1194pCi/1
- Blowdown line samples Highest 4058 pCi/l (near vacuum breaker 3)
All others approximately background
- Results believed to be from historical leaks 8
C Current Actions
- Determine active leakage or not Additional sampling Third party review
- Implement offsite sampling plan Requesting permission from property owner
- Implement remediation plan Short term in progress today Long term actions under development
- Ongoing corrective actions will likely include enhanced routine surveillances
- Provide periodic updates to-resident inspectors