ML063400100

2006/10/24-E-MAIL: (PA) Communications Package

ML063400100
Person / Time
Site:	Oyster Creek
Issue date:	10/24/2006
From:	Hufnagel J Exelon Corp
To:	Ashley D Office of Nuclear Reactor Regulation
References
%dam200701, TAC 8261
Download: ML063400100 (19)

Text

D. Ashley -Communications package Paqe 11 D. A shley" " ... ... ........................

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C om m unications packaq4 .,P.+.e 1,4 From: <john.hufnagel@exeloncorp.com>

To: <djal @nrc.gov>Date: 10/24/2006 10:34:26 AM

Subject:

Communications package Donnie, Here's the package we used in our discussions with Region I yesterday

-you may have this already...

-John.<<Comm Doc -Drywell Inspections 10-23-06 alex.ppt>>

This e-mail and any of its attachments may contain Exelon Corporation proprietary information, which is privileged, confidential, or subject to copyright belonging to the Exelon Corporation family of Companies.

This e-mail is intended solely for the use of the individual or entity to which it is addressed.

If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this e-mail is strictly prohibited and may be unlawful.

If you have received this e-mail in error, please notify the sender immediately and permanently delete the original and any copy of this e-mail and any printout.Thank You.

D. Ashley -TEXT.htm Page 1I D. Ashley -TEXT.htm Page 1 ii Donnie, Here's the package we used in our discussions with Region I yesterday

-you may have this already...

-John.<<Comm Doc -Drywell Inspections 10-23-06 alex.ppt>>

This e-mail and any of its attachments may contain Exelon Corporation proprietary information, which is privileged, confidential, or subject to copyright belonging to the Exelon Corporation family of Companies.

This e-mail is intended solely for the use of the individual or entity to which it is addressed.

If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this e-mail is strictly prohibited and may be unlawful.

If you have received this e-mail in error, please notify the sender immediately and permanently delete the original and any copy of this e-mail and any printout.Thank You.**** * ***** * ***********

• • • • ***** ***** *********

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3: 48841)

Subject:

Creation Date From: Created By: Communications package 10/24/2006 10:28:27 AM<john.hufnagel

@exeloncorp.com>

iohn.hufnagel

@exeloncorp.com Recipients nrc.gov OWGWPOO1.HQGWDO01 DJA1 (D. Ashley)Post Office OWGWPOO1.HQGWDOO1 Route nrc.gov Files Size Date & Time MESSAGE 1053 24 October, 2006 10:28:27 AM TEXT.htm 1656 Comm Doc -Drywell Inspections 10-23-06 alex.ppt 358400 Mime.822 495999 Options Expiration Date: Priority: ReplyRequested:

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Security: None Standard No None No Standard Junk Mail Handling Evaluation Results Message is eligible for Junk Mail handling This message was not classified as Junk Mail Junk Mail settings when this message was delivered Junk Mail handling disabled by User Junk Mail handling disabled by Administrator Junk List is not enabled Junk Mail using personal address books is not enabled Block List is not enabled P. Ashley 7 Comm Doc -Drywel inspections 10-23-06alxý ptPae Oyster Creek 1R21 Outage Communication Package Related to Drywell Shell Inspections October 23, 2006 PRELIMINARY I

D. Ashe Y -'Comm Doc -DR nspecioýns 10-23-6 .alex.ppt

......1R21 Drywell Inspections

• Reactor Cavity Trough Drain Line* Sand Bed Region Poly Bottles* Sand Bed Drain Lines* Epoxy Coating on External Surface of Drywell Sandbed in all 10 Bays* Internal Drywell Shell in Sand Bed Region Above Floor Elevation* Internal Drywell Shell in Upper Regions* Seal at the junction between drywell shell and concrete floor in Sand Bed Region" External Drywell Shell in Sand Bed Region* Plate Thickness Transitions at Two Elevations

• Internal Drywell Shell in Trenches (Bays 5 and 17)PRELIMINARY 2

D. Ashley -Comm Doc -Drywell Inspections 10-23-06 alex.ppt Page 3 ~i D. Ashley -Comm Doe -Drywell Inspections 10-23-06 alex.ppt Page 3 Inspection Status (To Date)" The reactor cavity trough drain line is not clogged and is successfully removing a small amount of water entering the trough. Daily water leakage monitoring continues (as planned, strippable coating was applied to reactor cavity before flood-up).

• There has been no water observed in the Sand Bed Regions and no water coming down through the air gap." There has been no water leakage from the Sand Bed Regions confirmed by the absence of water in the poly bottles. Daily monitoring of the poly bottles continues.

• Two of the five Sand Bed drain lines were found to have some blockage and debris. These will be cleaned prior to restart.* The visual inspection of the epoxy coating on the external shell surface in the Sand Bed regions has been completed.

• The seal at the junction of the drywell shell and the concrete floor in the Sand Bed region has-been inspected.

PRELIMINARY 3

D. Ahle -omm Doc -Drywell Inspec~tions 10-23-06aexptPg4 Inspection Status (To Date)" The Ultrasonic Inspections of the Interior Surface of the Drywell in the Sand Bed regions have been completed.

• The Ultrasonic Inspections of the Interior Surface of the Drywell in the Upper regions are in progress." The Ultrasonic Inspections of the Exterior Surface of the Drywell in the Sand Bed regions are completed.

• The Ultrasonic Inspections of the plate thickness transitions at two locations are in progress.* The Ultrasonic Inspections of the Interior Surface of the Drywell in the Trenches in Bays 5 & 17 have been completed.

PRELIMINARY 4

D: Ash .. .C -e Inspections 0-23-06a lexx.pp. Page5 Issues Identified" Standing water was identified in the trench inside the Drywell at the Drywell floor level in Bay 5 when the foam fill was removed for planned inspections." Dampness was identified in the other trench in Bay 17;however, no standing water was present." The Drywell drain trough may be a contributor to water leakage into the trench in Bay 5.PRELIMINARY 5

D. Ashley -Comm Doc-D~eII Inspections 10-23-06 alex.ppt Page 6 D. A01ey -Comm Doe -Drywell Inspections 10-23-06-0ýx-,W Pa Water in Bay 5 Trench Description of Findings and Actions to Resolve this Issue PRELIMINARY 6

D. Ashlev -Comm Doc -Drvwell InsDections 10-23-06 alex.vr)tD. Ashley -Comm Doc -Drvwell lnsnections 10-23-06 alex.DDt Paae 71 Issue Description" When performing planned Non Destructive Examinations of the Drywell Shell from inside the Drywell, water was found in a trench area below the floor elevation." A similar condition was identified in the mid 1990s and documented in the corrective action process." The source of this water needs to be understood and addressed, and any impact on the drywell shell or concrete evaluated and addressed.

PRELIMINARY 7

D. Ashlev Comm Doc -Drvwell InsDections 10-23-06 alex.ppt P ýge D. Ashley -Comm Doc -Drvwell Inspections 10-23-06 alex.Dot Paae8.I Drywell Design and Layout* The Drywell floor drain sump is located within the under-vessel area room" A concrete trough encircles the under-vessel area to channel any leakage in the drywell to the drywell sump PRELIMINARY

0. Ashley -Comm Doe -Drywell ln~~ctions 1O:23~O6 a~x.ppt Page 94ý. Asýley -Comm Doe -D"911 Inspections 10-23-06 aIpej.ppt age 9, Sketch Showing Lower Drywell -Sandbed, Trench and Sump~bI1JAC~

D. Ashley -Comm Doc -Drywell Inspections 1 O-23-O6aiex.ppt Page 1O~I D. Ashley -Comm Doc -Drywell Inspections 10-23-06 alex.ppt Pagei 10 Trench Detail Sketch DENSITY RILICONE DRYWELL VARIES CROSS-SECTION AREA OF TRENCHES IN BAYS 5 & 17 P. Ashley -Comm Doc-Drywell Inspections 10-23-06 alex.ppt Pa eli D. Ashley -Comm Doe -Dryweli Inspections 10-23-06 alex.ppt Plan View of Trough and Trenches 11 KEY PLAN#$CALF. W%ý D. Ashley -Comm Doc -Drywell Inspections 10-23-06.......... ...................

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Page6 f12 D. Ashley -Com~n Doc -Drywell Inspections 10-23-06 alex.ppt Page 12~J Top View -Drywell Floor Sketch 12 D. Astýley -Comm Doc -Drywell Inspections 10-23-06a"ýpp Page 13 D. Ashley -Comm Doc- Drywell Inspections 10-23-06 alex.ppt Page 13~As Found Condition" Surface of drywell shell visible from trenches in Bays 5 and 17 exhibited a surface layer of iron oxide" Approximately 5" of water found in bottom of trench in Bay # 5, and trench in Bay 17 had only dampness" Connection between under-vessel area trough and floor drain sump potentially allowing water leakage" Trough located in the under-vessel area is, not lined, potentially allowing water passage into the concrete slab PRELIMINARY 13 D. Ashlev -Comm Doc -Dwell lnsDecti6n"s'1'6-23-66'ýali'e'-x'.-r)Dt Pa e.. .. A sh e C om m.. .D oc .-... .'D.... ...........................

s.. ...ecti. ......o........s.....10-23-06.......

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.. -e14 Investigative/Corrective Actions Completed" Visual inspections and pictures taken of sump, trough and trench areas* Visual and Ultrasonic examinations of drywell shell in trench areas (as originally planned)" Chemical Analysis of water samples from trench, sump and other areas" Correlation and evaluation of water levels in sump, trough and trench areas PRELIMINARY 14 D. AsWey -Comm Doc -Drywell Inspections 10-23-06 alex.ppt Page 15t D. Ashjey- Comm ~Ooc -Drywell Inspections 10-23-06 alex.ppt Page 15~Actions Planned/Pending

• Visual Examination (VT-1) of floor drain sump liner to look for evidence of a leak path" Tracer test aimed at determining whether under-vessel trough is in communication with trench in Bay 5* Development of contingency repair to trough to address likely water source into trench* Complete non destructive examination and analysis of Drywell shell in trench areas* Perform evaluation of the impact of water that may exist beneath concrete surface on drywell shell" Development of contingency repair to caulk intersection of Drywell Shell and concrete slab curb PRELIMINARY 15 D. A~se,- Comm Doc -Drynwel Inspections 10-23-06 alex~ppt Page 16 1---1 Page 110 Current Conclusions

• Preliminary Inspection Results indicate that the Drywell Shell-Retains its structural integrity-Provides margin to design safety function-Supports plant operation for the period of extended operation PRELIMINARY 16