ML093420027
| ML093420027 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 04/23/2009 |
| From: | Nimitz R NRC Region 1 |
| To: | Ronald Bellamy, Marc Ferdas, Jason White NRC Region 1 |
| References | |
| FOIA/PA-2009-0214 | |
| Download: ML093420027 (2) | |
Text
Sheehan, Neil From:
Ronald Nimitz Sent:
Thursday, April 23, 2009 10:08 AM To:
John White; Marc Ferdas; Ronald Bellamy Cc:
Darrell Roberts; Peter Wilson; David Lew; Marc Dapas; Sam Collins; James Clifford; Diane Screnci; Doug Tifft; Nancy McNamara; Neil Sheehan; Richard Conte; Ed Miller
Subject:
update for 4/23/09 Status Call - Oyster Creek.
A call was held 7:30 am with the licensee's Issue Management Team (IMT) (discussed previously). The following updates are provided.
- a. Likely Sources:
The IMT established a Failure Mode Tree based on prioritization and review of the likely source of the tritium.
Currently 5 potential sources (as discussed previously-see below)are being reviewed.
- 1) The licensee is continuing with planning for the hot tap of the 6" line.
- 2) The licensee has been attempting to pressure test the 1" flow line to the condensate pumps. This is continuing.
- 3) The licensee has bore scoped the floor drain in the CST Transfer Building and identified an apparent leak into the pipe of ground water. This line was last used in November 2008 and is being looked at as a possible source considering migration time of water to the well locations. The licensee had checked the sump in the building with no indication of leakage.
- b. Well Data The licensee has drilled an additional well (MW-51) in close proximity to the CST tank (to the south west) That result has shown 6 million pCi/l(April 22, sample). There are now three wells that show elevated activity.
These are generally located in an area to southwest of the Condensate Transfer Building and the CST:
- MW-1 5k-1A - 4.5 million pCi/I (in south west)
- MW closer to CST and Condensate Transfer Building also in southwest (5 million pCi/I)
- MW near CST also in south west - 6 million pCi/I Other well samples, and samples of the canal discharge continue to indicate minimum detectable activity.
- c. Work plans In light of the latest well results on the new well MW-51, the licensee is re-evaluating the plan to hot-tap the 6" aluminum condensate line as a potential leak source. Rather, the licensee is considering excavating under the Condensate Transfer Building to visually inspect the area.
- d. Public out reach The licensee does not plan an update news release at this time but this will be discussed during its 1:00pm communications team meeting. We will be updated on this at the 3:30 pm call.
- e. Dose assessment Notwithstanding minimum detectable activity in canal discharge (both gamma and tritium analysis), licensee is developing mass flow analysis of ground water to perform bounding dose calculations.
- d. NRC actions NRC reviewing and following developments. Reviewing/updating, as applicable, MC-309 review, updating white paper and communications plan, including implications for aging management. In addition, communications with State of New Jersey in review.
Next call 3:30pm Information in this record was :deleted hi accordance with the F-edomoflnfor*o*.
.exemptins FOlk
-N From: John White Sent: Wednesday, April 22, 2009 4:31 PM To: Marc Ferdas; Ronald Nimitz; Ronald Bellamy Cc: Darrell Roberts; Peter Wilson; David Lew; Marc Dapas; Sam Collins; James Clifford; Diane Screnci; Doug Tifft; Nancy McNamara; Neil Sheehan
Subject:
Daily Briefing and Status Calls, Oyster Creek.
Until there is more resolution and determination of the source of the H-3 contamination at Oyster Creek, the licensee will be conducting two daily briefinqs wifI NRC at 0730 and 1530. The bridge number for both calls, starting 4/23 is 888-233-4221, passcode*
4T*ie NJ-DEP may also participate in these calls.
4/23, 1530, Status Update: Exelon has established an Issue Management Team with 5 sub-groups:
Communications Environmental Monitoring Regulatory Affairs Troubleshooting Root Cause Each team will report out on each NRC Daily Briefing call.
Current:
MW-50 has been completed (well located SW of CST). Sampled, resu!t confirmned as S 02bbo'pCi/I, H-3.
MW-51 is in progress (SW of CST, in closer proximity). Expect completion and preliminary sample collection tonight.
Other potential Monitoring Wells are being considered to enhance detection of leak source. Permits have been obtained from the NJ-DEP.
Troubleshooting actions:
Work progressing on hot tapping of A-4 (6" Aluminum line from condensate transfer pumps to Turb. Bldg.
Fabrication and preparation in progress, actual tap initiation is hot expected to occur on 4/24... preparations still in progress.
CS-26, 1" line from Hotwell lever control system to the Condensate Pump seals.., potential source, further examination being considered.
CS-38, 1" line from CRD pumps to CST minimum recirc line... line remains buried, potential source, further examination being considered.
Condensate transfer building floor drain, potential source, boroscope examination today, data is being evaluated.
Condenstate Storage Tank, Monitoring Wells in progress, as previously reported.
Next call, 0730 on 4/24. Ron Nimitz attending.
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