ML063400100

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.,P.+.e 11 D. Ashley" C om munications packaq4 " ... . .. . . ...................... ....................................................... 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. Ifyou 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 D. Ashley TEXT.htm Page 1I 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.

c:\temp\GW)O0001 .TMP page -I Pn Mail Envelope Properties (453E2461.EC9: 3: 48841)

Subject:

Communications package Creation Date 10/24/2006 10:28:27 AM From: <john.hufnagel @exeloncorp.com>

Created By: iohn.hufnagel @exeloncorp.com Recipients nrc.gov OWGWPOO1.HQGWDO01 DJA1 (D. Ashley)

Post Office Route OWGWPOO1.HQGWDOO1 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: None Priority: Standard ReplyRequested: No Return Notification: None Concealed

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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

Page 3 ~i D.Ashley D. - Doc - Drywell Comm Doe Ashley - Comm - 10-23-06 alex.ppt Inspections 10-23-06 Drywell Inspections 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

alex.ppt Page 6 D. - Doc-D~eII Comm Doe Ashley - Comm D. A01ey Inspections 10-23-06

- 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)t Pa*e]

Paae 71 D. Ashley Comm Doc Drvwell lnsnections 10-23-06 alex.DDt 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 Pýge I D. Ashley Comm Doc Drvwell Inspections 10-23-06 alex.Dot

- - Paae8.

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

Page 94

ý. Drywell Inspections Ashley - Comm Doe - D"911

0. Asýley - - 10-23-06 a~x.ppt ln~~ctions 1O:23~O6 aIpej.ppt age 9, Sketch Showing Lower Drywell - Sandbed, Trench and Sump

~bI1JAC~

O-23-O6aiex.ppt Page 1O~I D. - Comm Doc Ashley - Comm D. Ashley - Inspections 1 Drywell Inspections Doc - Drywell 10-23-06 alex.ppt Pagei10 Trench Detail Sketch DENSITY RILICONE DRYWELL VARIES CROSS-SECTION AREA OF TRENCHES IN BAYS 5 & 17

Pa eli D. - Comm Doe P. Ashley - Comm - Dryweli Inspections Doc-Drywell 10-23-06 alex.ppt Inspections 10-23-06 alex.ppt Plan View of Trough and Trenches 11 KEY PLAN

1. $CALF. W%ý

D. Ashley - Comm Doc - Drywell Inspections 10-23-06 Page6 D. Ashley Com~n Doc Drywell Inspections 10-23-06 alex.ppt Page f12 12~J Top View - Drywell Floor Sketch 12

D. Astýley - Comm Doc - Drywell Inspections 10-23-06a"ýpp Page 13~

13 D.Ashley Comm Doc- Drywell Inspections 10-23-06 alex.ppt Page 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

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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 1---1

• *l Page 16 110 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