ML091900428
| ML091900428 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 11/15/2008 |
| From: | Richmond J NRC Region 1 |
| To: | David Pelton, Darrell Roberts NRC Region 1 |
| References | |
| FOIA/PA-2009-0070 | |
| Download: ML091900428 (3) | |
Text
John Richmond From:
John Richmond Sent:
Saturday, November 15, 2008 3:59 PM To:
Darrell Roberts; David Pelton Cc:
Doug Tifft; Richard Conte; Ronald Bellamy; Stephen Pindale; Jeffrey Kulp; Justin Heinly
Subject:
UPDATE: OC New item discovered in sand bed region of OC Drywell - not a drywell integrity concern Saturday-Nov 15 UPDATE As of this morning, only 2 sand bed bays were still open, Bay-1 1 and Bay-1 7. Both were inspected today and found dry. At this time (-3 pm), close-out of these 2 bays is in-progress [re-installation of the sand bags].
This morning, sand bed Bay-11 drain line poly bottle was found FULL. Yesterday it was reported as empty, but there was water identified in the tygon tube from the bottle to the drain pipe in the overhead. AmerGen NDE Level-Ill entered Bay-1 1 this morning, and found it DRY. The drain pipe inside Bay-1 1 (you can see about a foot down into the pipe) was also dry. AmerGen Licensing said a back-of-the-envelope calc was done, and they believe that a "full" tygon tube has about the same volume as the poly bottle. At this point in time, AmerGen believes that the water in the bottle came from water that was "trapped" the tube. A chemistry sample of the water is in-progress. AmerGen's investigation is on-going.
Jeff Kulp and myself both estimate the poly bottle's volume as 2+ gallons. AmerGen estimates the poly bottles to be just under 3 gallons, and the tygon tube to be about 50 to 60 foot in length, which seems reasonable to me. Assuming its 5/8 OD, then my arithmetic says the tube volume is only about 1 quart, not 2 to 3 gallons.
AmerGen will continue to monitor the poly bottles daily, until the plant reaches 100%, then will re-assess a monitoring schedule. This monitoring plan seems reasonable to me.
A 3rd Startup PORC is scheduled for Sunday 9:30 am, with plant startup scheduled for 6 PM.
Sand Bed Review -- UT locations versus Bays whether Water was Identified Bay ##
? Water Found UT Locations, by elevation [each location is a 7x7 array of 49 UT readings]
9 sound of dripping, no water 87' 11 Yes no UT locations in the upper drywell 13 Yes 50', 51', 71', 71', and 87' 15 Yes 23', 23', 50', 71', 71', and 87' 17 Yes 23', 23', 71', and 71' UT data taking next outage, at these UT data locations in the upper drywell, would seem reasonable to confirm whether there will have been any unexpected shell corrosion, as a result of the water intrusion this outage from cavity leakage (due to the strippable coating coming loose).
John R.
From: Darrell Roberts Sent: Friday, November 14, 2008 7:54 PM To: Sam Collins; Marc Dapas Cc: David Lew; Michael Scott; Ronald Bellamy; Richard Conte; John Richmond; Jeffrey Kulp; Stephen Pindale; Doug Tifft; David Pelton; Nancy McNamara; Marjorie McLaughlin; Brian Holian; Richard Barkley
Subject:
New item discovered in sandbed region of 0C Drywell - not a drywell integrity concern 1
A f
This evening around 6:30 pm, Amergen informed us of a new condition discovered in Bay 17 of the drywell (sand bed region). The licensee found brightly colored rusty water on the exterior shell coming from above the epoxy coating and running down the coating onto the floor. The licensee has entered this observation into its corrective action program and is currently assessing the identified condition. The source of the rust was believed to be previous corrosion in the upper drywell areas (uncoated steel). Based on UT readings from 2008 and before, the corrosion rate in the upper drywell areas has been very low and the shell thickness has significant margin.
ine inspectors' initial assessment is that, given the cavity leakage that has already been identified in other bays, this does not appear to be an unexpected development. Given the timeframe involved (about one week
,ince the leakage from the reactor cavity began during the current outage), it is highly unlikely that the discovered condition represents current corrosion. What washed down was likely old rust from previous corrosion due to prior cavity leakage. The inspectors will review UT data locations and compare them to sand bed locations which were identified to have water intrusion as part of the ongoing inspection.
We (John Richmond and I) briefed Marc D. Friday evening and are sending this email as follow-up to other parties. We will follow the licensee's dispositioning of this item along with the others identified during the outage during the ongoing license renewal inspection.
DJR 2
Received: from R1CLSTRO1.nrc.gov ([148.184.99.7]) by R1MSO0.nrc.gov
([148.184.99.10]) with mapi; Sat, 15 Nov 2008 15:58:43 -0500 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: binary From: John Richmond <John.Richmond@nrc.gov>
To: Darrell Roberts <Darrell. Roberts@nrc.gov>, David Pelton
<David. Pelton@nrc.gov>
CC: Doug Tifft <Doug.Tiffl@nrc.gov>, Richard Conte <Richard.Conte@nrc.gov>,
Ronald Bellamy <Ronald.Bellamy@nrc.gov>, Stephen Pindale
<Stephen. Pindale@nrc.gov>, Jeffrey Kulp <Jeffrey. Kulp@nrc.gov>, Justin Heinly
<Justin. Heinly@nrc.gov>
Date: Sat, 15 Nov 2008 15:58:42 -0500
Subject:
UPDATE: OC New item discovered in sand bed region of OC Drywell -
not a drywell integrity concern Thread-Topic: UPDATE: OC New item discovered in sand bed region of OC Drywell - not a drywell integrity concern Thread-Index: AclGvKEUM2D1 DLiFQO2C+m5prv8rVgAp/2pw Message-ID:
<2856BC46F6A308418F033D973BBOEE72AA545E3A08@R 1 CLSTR01. nrc.gov>
References:
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