ML072841077
| ML072841077 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/22/2006 |
| From: | Dunsmuir S Exelon Corp |
| To: | Howie R, Krejsa J, O'Rourke J - No Known Affiliation, Office of Nuclear Reactor Regulation |
| SECY RAS | |
| References | |
| 50-219-LR, AmerGen-Intervenor-26, RAS 14339 | |
| Download: ML072841077 (2) | |
Text
Citizens Exhibits 26 Lm u ID-C CQ\\L (
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From:
Dunsmuir, Steven P <Steven.Dunsmuirexeloncorp.comT-....
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Sunday, October 22, 2006 4:52 AM Ad Ul1 D
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WfHOR4 To:
Ray, Howie <uOOlfhr@ucm.com>; Krejsa, John <u999j O'Rourke, John F. <t925jfo@ucm.com>
Subject:
Trench prep, test, and 1-8 sump report.
10/21/06 Preparing Diiywell liner surface for UT thickness reading.
5 (under ladder)
Surface had traces of a red primer and gray sealant layer. Bare metal had a light oxide layer and areas of light to moderate pitting. 80 grit "tiger paw" discs and angle grinder were used to remove paint and oxide layers. In areas of pitting no attempt was made to clean out or "chase the pits". Areas were left in a condition suitable for UT testing.
17D Upper surface near "plug weld" was prepared to white metal prior to our arrival.
Under this area is the area we were tasked to prep. The first foot or so. had a simple grey epoxy type paint coating and seam to be relatively fresh. This area was cleaned to white metal in less than five minutes. Below this area was a baked on two layer coating. This section was very tough to clean and took over one hour to prep.
DOCKETED Photographed prepped area,.
USNRC K:\\Drywell\\ I R21 Drywell Pictures\\DW 13 ft Core Bore Preps Prep time approx 3:15 and 80 mr per worker.
October 1, 2007 (10:45am)
OFFICE OF SECRETARY 10/22/06 RULEMAKINGS AND HEPA Vacuum test ADJUDICATIONS STAFF Entered drywell to continue HEPA Vacuum timed test.
Found test was invalid HEPA unit top was not placed back on unit properly. Vacuum was not functioning. Measured level in vacuum tank at 2 5/8" emptied v'acuum tank.
Water level in test trench (core bore) was 18 V2 measured from top surface of the concrete. Over a 40 min period there was no change in this level.
Placed top back on empty vacuum unit. Place hose back in trench restarted vacuum and stopwatch also marked time with phone system time at 10:56 pm Trough Levels:
Marked 4 test points around trench A, B, C, D clockwise from door way with C being to the left of 1-8 sump. A Dry, B 1/16", C /2", D Dry.
Dose 22mr Test 2 Entered Drywell Checked Trench (core bore) Dry and Vacuum still running.
Shutdown vacuum and stop watch 3:23:13. Measured water in vacuum tank 1 1/4/"
A~fer 15 min checked trench level was at 20" a thumb sized puddle of approx 2 or 3 oz.
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'a Restarted vacuum and stopwatch, vacuum tank was NOT emptied.
1-8 Sump level was measured @ 13" deep.
Trough levels:
A Dry, B 1/16, C 2", D 1/16 Photos of feeder holes to the 1-8 sump are at:
K:\\Drywell\\lR21 Drywell Pictures\\1R21 DW 1-8 Sump In the photos you can see the holes thru the trough into 1-8 sump. What appears to be gaps between concrete and drain to sump can be seen.
Point of interest:
In the trough to the very right of data point C (to the left of the sump) a area of loose aggregate was noticed. When probed with the ruler, the loose material is about 2" deep. I tested the right side of the sump and found a matching hole / pit. This could be from original construction chipped out and not refilled when fitting the sump liner.
Dose 20 mr Vacuum information:
Minuteman 85 Model 801085 Serial # W8010850829 Rad con # V-29 inside diameter 15 3/8" Steve Dunsmuir FIN/Operations RO OCLROO014455