ML20204J743

Assessment of Embedment Plates Status as of 870308, Weekly Status Rept

ML20204J743
Person / Time
Site:	Dresden, Quad Cities, 05000000
Issue date:	03/12/1987
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20204H548	List: ML20204H543 ML20204J743
References
NUDOCS 8703270300
Download: ML20204J743 (60)

Text

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1 Weekly Status Report Assessment of Embedn;ent Plates Statua its of March 8, 1987 q

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Commonwealth Edison Company Dresden Station - Units 2 and 3 Quad Cities Station - Units 1 anc) 2 March 12, 1987 9

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I. Introduction

. ~d l l This is the first of a series of weekly reports which hM '

r address the effort to resolve the issue regarding the embedment plates which were constructed with 18 in. strap

'- .> anchor spacing. The purpose of tnis report is to update h/ the status for th(is effort.the Nuclear Regulitory Commission, Region III regarding

' This first week report provides

-+

a brief background of the issue and a plan of action for its resolution. Also included are attachments which H s.

_ will be updated on a weekly basis and provide statistics regarding the number of hangers which are affected and information regarding these hangers. A milestone schedule j' ...p'roviding start arid completion dates for the major items

1. df work is also included.

II. Background On February l't, 1987, Commonwealth Edison Company (CECO) notified Sargent & Lundy (S&L) that the embedment plate which suppoits pipe hanger M-1150D-62 at Dresden Unit I 4

s. 2 had been found'to be deformed. Pipe hanger M-11500-62 consists of a rear-end bracket connected to a rigid strut

',that supports a 12 inch-diameter core spray line. Commonwealth

, Edison Company asked S&L to investigate this plate and to provide a repair.

~

In^the course of the investigation, S&L found that the strap anchor ~s' p acing shown on shop drawings for this embedment plate did not conform to the strap anchor spacing

, shown pn the design drawing. The design drawing required a strap anchor spacing of 9 inches on center staggered,

Nhile the shop drawi'ng showed a strap anchor spacing of 18 inches on ' center staggered (See sketch). A larger ctrap anchor spacing means that the embedment plate would

, have.a lower load carrying capacity than originally intended.

The repair ~for the embedment plate supporting hanger Y

2 M-ll500-62'was issued on February 20, 1987 and has been completed in the field. The cause of the deformation

,, of this plate is being investigated.

2~

m '

/ -

j

, // III. ImmediatoAction-i

'To resolve the discrepancy between design drawings and shcp drawings, CECO has implemented two actions in parallel.

^ 'q, 1) Perform ultrasonic inspection on some existing embedment

. plates at Dresden and Quad Cities Stations. The purpose of the inspection is to verify the strap anchor spacing. A mockup of an embedment plate with J

i t

2-3

<= , .p w ,

a e

strap anchors was constructed and used to calibrate i the ultrasonic test equipment. Using this UT equipment, ,

two plates at Dresden have.been ultrasonically exami'ed n

s and the strap spacing matches the shop drawing.

A number of additional in place embedment plates are being ultrasonically examined at both Dresden and Quad ,C,Nties Stations.

In addition; CECO had reported that there was a loose embedment plate with no hangers attached at Quad Cities. This plate has been examined and the strap spacing matches that shown on~ shop drawing. No further

,'- action on this plate is required.

' 2: ) The second action performed in parallel to verifying the strap anchor spacing is to collect large bore pipe hanger drawings showing attachments to embedment plates and perform an engineering assessment as described below.

IV. Data' Collection and Engineering Assessment Assuming that the UT examination will confirm 18" strap {

anchor spacing, a program of data collection and an engineering l assessment of the embedment plates using the shop drawing configuration has been initiated. This assessment is described below.

1) Large bore pipe (24" in diameter) hanger drawings -

showing attachment to embedment plates in the Reactor

" Buildinss and portions of the Turbine Buildings at s Dresden and Quad Cities were collected. These pipe hangers along with the embedment plate locations have been plotted on plan drawings for future use.

The location of the embedment plate seams were also plotted. The data collected so far includes hanger drawings which are in S&L's-possession. Other AEs are being contacted in order to confirm that S&L.

has all applicable hanger drawings.

Support drawings for conduit, cable tray, HVAC and small bore piping were not collected. Loading from these supports is relatively light compared to that from large bore supports. ,

2) Generic embedment plate allowable loads have been developed. Originally conservative hand calculations

, were used to develop the embedment plate allowable loads. For this assessment a refined analysis using a finite element computer program has determined the OBE, SSE.and upper limit allowable loads. The allowable loads are dependent on attachment size >

and attachment location relative to edges of the plate and strap anchors. The allowable loads were x -- -. -

based on a conservative (worst) location of the hanger

, attachment and a conservative (small) size of the hanger attachment. Based on the computer program, load deflection curves were developed for both the interior and exterior regions of the embedment plates.

.These load deflection curves were used to develop the above mentioned allowable loads.

3) Using the embedment plate allowable loads discussed in Item IV-2, the pipe hangers were sorted into two categories as follows:

a) Pipe hangers whose loads were within the allowable loads for the embedment plate and require no further action, and b) Pipe hangers whose loads were outside the allowable loads for the embedment plate. This second category was broken down further into the following:

i) Pipe hanger loads which are greater than the embedment plate upper limit.

(ii) Pipe hanger loads which are less than the embedment plate upper limit but greater than the embedment plate FSAR limits.

4) Based on the sort of hangers discussed in Item IV-3, a walkdown of pipe hangers whose loads exceed the embedment plates upper limit will be performed immediately and is in process at Dresden. A second walkdown of pipe hangers whose loads exceed the embedment plate FSAR limit will be performed at a later date.

Each walkdown and resulting assessment will consist of the following phases:

a) Perform a walkdown to confirm the visible as-built information such as attachment size and attachment location relative to the edges of embedment plates which could vary due to installation tolerances. In addition, the presence of other attachments in the vicinity , the attachment being walked down will be documented and this .

data will be included in further analysis.

b) Based on the information collected during the walkdown, a review will be performed to determine if further field investigation is necessary or if the loading on the embedment plate is acceptable.

1

• l

~

G c) If the hanger load still exceeds the embedment plate allowables, the strap anchor spacing and plate orientation will be determined-by using ultrasonic testing. l d) Using the strap anchor locations another analysis will-be performed. During this analysis it may be possible to take advantage of the relative location of the strap anchors l with respect to the location of the hanger '

load, i.e., if a load is located directly over or close to a strap anchor, sufficient embedment plate capacity probably exists.

Those hanger loads which exceed the allowable loads derived from this second analysis will require further action.

'V. Attachments The following attachments are included for your information:

1. Milestone bar chart - Dresden and Quad Cities

2. Summary Status - 2A Dresden' 2B Quad Cities

3. Number of embedded plates - 3A Dresden 3B Quad Cities

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6" PL.I/2." X 9 "

.BOTT. OF SLAB DETAIL K PER S 8 L DESIGN DWG. (B-260) 9" _

9" _

9" =

9" I 7 9" 9" 9" _

PLAN VIEW - 9" ON CENTER STAGGERED STRAP SPACING l8" -

f F 18" _

18" DETAIL PER SHOP DWG.- 18" ON CENTER STAGGERED STRAP SPACING

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- (> e Attschmert i Page I sf 2 '

Dres **u 253 B'r Chere f a r Embedment Pl*t* Issue Resolution ,_ _ _,

I I w__a Quad Cities 162 tar Chart for Embedment Plate Issue Resolution . gg,gg gan g.mgg WEEE B E C I N N'I N C M0NDAY ACTIVITY 2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 3/16/87 3/23/87 3/30/8i 4/6/87 4/11/87 4/20/87 4/27/87 Ceco requests $6L's ass & stance l for one f ailed eeb. plate at Dresden Unit 2 (2/11/87)

- S&L assesses failed plate and i informs Ceco that the strap spacing on emb plate shop dwg. is different from S&L's design dwg.

- CECO requests a review of ad- g d a tional shop dwga. , a mockup plate ECM for UT calibration and determination of plate capacity per shop dwg. detail.

Repair of failed plate is issued.

- S&L obtains prints of large bore hanger dwss. with attach- "-------------a ment to emb. plate. " - ~ - " " ~" " " ' " ~ ~ ~

- 56L prepares hanger location i dwgs.

m---_--._------

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- 56L sorts and plots hanger i

attachments (draftingl. In r-----._-_-- -,

addition. S&L locates neams of ------'----- -"

emb. plates using piece marks on shop dwgs.

- $4L generates emb. plate capacity, i '

- S&L performs an engineering i assessment and identifies those - - - - - - - - - -

'- 1 hangers which meet the shop dwg. " " " " " " " * * " "~ ~ " "

plate capacity and hence are of no concern.

- S&L performa a sort of remaining i hangers into those which may > - - - - - - - -

potentially affect piping system = =}

function and those for which the embedment plate FSAR allowables i

are exceeded.

i 9

2 P O, (F e Att<chneet I fContinued) page 2 e f 2 Dresden 263 Sar Chart for Embedment Plate issue Resolution Cuad Cittes 162 Sar Chart for Embeenent place issue Resolution WttE 5ECiWN1NC M0NDAY

• ACTIv!TY 2/9/87 2/16/87 2/23/87 .3/2/87 3/9/87 3/16/87 3/23/87 3/30/87 4/6/87 4/13/07 4/20/87 4/27/87--

56L/crco performe a wattaown for those hangers which may [") --as* CemetehMJie4th

• potentially af fect piping system analysis and determine CW=COsd hesusse(s -

attachment location relative to edges of emb. plate and strap. If necessary. CICo performa UT for strap location.

- S&L utilises walkdown data to perform a sort of these hangers to identify those hangers which still may potentially af fect piping system analysis.

- S&L/ Ceco perform a walkdown for those hangers which may potentially cause embedmont plate FSAR allow-ables to be exceeded.

- Assess these hangers based on walkdown data and issue repairs as necessary.

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- . . ._ . _ , . . _ . . ~ _ . . -

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Ste't" Summary 5 o' '

Dresden

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Total .In APPROI!NATE NUNSER OF LARGE SOkt PIPE MANCERS ON DeSEDDED FIATES DESCRIPTION In Unit Unit Safety Nonsa fe ty

1. 2 $3 Reactor r

'Related. Turbine Loads) Loade> .

Related . Alds. ' Ble s. Upper Large bore hangers coIIected for follow up work FSAR '

2230 - 1060- 1170 Limit -

750. ' 1480 1460 770 ..

Result of first sort using generic 25" x 2%" \ .; *

-1 440 230 attachaeot size a!!owable limits fo<.aber of 210 170 270 hangers requiring fo!!aw up work) l 180 60

'250 190

-1

- l-Results of second sort using generic' larger 285 .t .

atta.hment stae allowable limits where applicable 182 106 108 i ,

ISO 288 *

(number of hangers requiring follow up work) 0 IS4 134: See note 1:

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f Result of walkdown and evaluation fer hangers gwith leads ) allowable upper limits (number of a

hangers requiring follow up work) {.

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- Phase l

! - Visual data obtained frcm floor t

• - Phase 11 - Utiliair.g UT data for strap location f

Result of walkdown and evaluation for hangers with load > allowable FSAP limits (number of hangers i requiring follow-up sork) i f 4 I

l.

- Phase ! - Visual data obtained from floor

- Phase 11 - Utillair.g UT data for strap location

-~ .'b The table above describes the results of large bore hanger drawing collectin..v - ~.- -- -~-

• ~ ~ -

on. Plotting and sorting.

Note la The second sort .

Numerical values represent number of hangers and are app /oximate numbers.

bore included in hangers over the next weekly report.safety-related equipmentreduced in Turbine Building should also be assessed. the hangers requiring f oalow-up work to 288 from The changes in the hanger numbers presented on this line due to thisnon-safety related l will be 4

k

3 e o Attachee.t 28 .

St=tv, Summary

- Quod Citles APPROXIMATE NUMBER OF LARCE BORE PIPE MANGERS ON EMBEDDED PLATES DESCRIPTION Total in Unit In Untt Safety Nonsafety Reactor

1. 2 #3 Turbine Loads > Loade>

Related Re la t ed Bldg. Sidg, Upper

• FSAR Laett Large bore hangers collected for follow up work Result of first sort using generic 2\" a 2h" attachment size allowable limits (number of hangers requirang fo!!ow up work!

Results of second so-t using generic larger attachment size allowable limits where applicable (number of hangers requa rang follow up work)

Numbers will be provided/

Result of walkdown and evaluation for hangers updated in the following with loads > allowable upper limits (number of hangers requiring follow up work) Weekly Status Reports.

- Phase 1 - Visual data obtained from floor

- Phase 11 - Ut ilt r ar.g UT Jeta for s t rap locat ion Result of walkdown and evaluation for hangers with load allowable FSAF lamats (number of hangers requiring follow up sork)

- Phase 1 - Visual deta obtained from floor

- Phase si - Ut alizarg UT data for strap location

-.- - - --.-...- .~ .- ~.

The table above describes the results of large bore hanner drawana collection, plotting and sorting. Numerical values represent number of hangers and are appron t mat e num

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,o Attachment #3A #

-I Number of Embedded Plates

Dresden  ;

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- The following table shows a breakdown of number of embedded plates with large bore pipe hangers attached to them. The numbers indicated are approximate.=

- Bldg - Unit Unit #2 Unit #3 Total Reactor Building '360 470 830 Turbine Building 90 100 190 Total 450 570 1020 4

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• l Attachment'#3B Number of Embedded Plates Quad Cities The following table shows a breakdown of number of embedded plates with large bore. pipe hangers attached to them. The numbers indicated are approximate.

Bldg ~- Unit Unit #1 -Unit #2 Total Reactor Building Numbers will be provided/.

Tu'rbine Building updated in the following Weekly Status Reports.

Total I I

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l Weekly Status Report

' Assessment of Embedment Plates '

Status as of March 8, 1987

' Commonwealth Edison Company Dresden Station - Units 2 and 3 Quad Cities Station - Units 1 and 2 March 12, 1987

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i 1, I. LIntroduction

~

This.is the'first of.=a. series of; weekly' reports which

~

~ address.the effort ~to. resolve tise issue regarding the J

embedmentiplates which were constructed with--18 in. strap

' -anchor spacing. The purpose of-this report is to update

_the Nuclear Regulatory Commission, Region III regarding

.he; status for this effort.

t This first week report provides r

a.brief' background'of the' issue and a plan'of action for its resolution. Also included are attachments which will be, updated on a weekly basis and-provide statistics regarding the number. of hangers which are af fected :and information regarding these hangers. A milestone schedule providing start.and completion dates for the major' items of' work is also included.

II. Background

~ On-February!11, 1987,' Commonwealth Edison Company (CECO) '

notified Sargent: & Lundy (S&L) that the.embedment plate p which supports pipe hanger M-1150D-62 at Dresden Unit ti l 2 had been found to be deformed. Pipe hanger M-ll50D-62; consists of'a rear-end bracket connected to a. rigid--strut

>- that supports a--12 inch diameter core spray line. Commonwealth Edison' Company askedLS&L to-investigate this plate and to provide _a_ repair.

t i_ ;In the course of'the investigation,'S&L found that the

-strap anchor-spacing shown on shop drawings for this m -

embedment plate-did not conform to the strap anchor spacing

'shown on the' design drawing. The design drawing required

-a strap anchor spacing of 9 inches'on center staggered, while the shop drawing showed a strap anchor spacing

' of 18 inches on center staggered (See sketch). . A larger strap anchor spacing means that the embedment plate would

~

have a lower load. carrying capacity than originally intended.

! The repair'for the embedment plate supporting hanger M-ll50D-62 was issued on February 20,=1987 and has been

i. completed in the field. The cause of the. deformation

~

of this plate is being investigated.

S

• I -III. Immediate Action j' To resolve the discrepancy between design drawings and shop drawings, CECO has implemented two actions in parallel.

[ 1) Perform ultrasonic inspection on some existing embedment-

! plates at Dresden and Quad Cities Stations. The purpose of the inspection is to verify the strap L anchor spacing. A mockup of an embedment plate with I

l.

l-l L L

r

~ ~

, .l

.c ,

~

strap anchors was~ constructed and used tol calibrate i

the ultrasonic te'stl equipment. ~Using this UT equipment, i two plates atLDresden have been ultrasonically examined. l and theastrap spacing matches.the shop drawing. I

.A; number of' additional-in place embedment' plates .

'are-being ultrasonically examined at both Dresden and-Quad: Cities ~ Stations.-

In addition, CECO had. reported that there was a. loose embedment plate with no hangers attached at Quad Cities. This plateLhas beenl examined and the strap spacing matches that shownlon shop drawing. No further action on this plate is: required.

2) The second action performed in parallel to verifying.

the strap anchor spacing is to. collect 1arge bore

~

pipe hanger drawings showing attachments to embedment plates and perform an engineering assessment as described-s ~below.

IV. Data Collection and Engineering Assessment Assuming that'the UT examination will confirm 18" strap anchor spacing, a~ program of data collection and an engineering assessment of.the;embedment plates using the shop drawing configuration.has been-initiated.- This assessment is

-described below.

1) Large' bore pipe (24" in. diameter) hanger drawings showing attachment to embedment plates in the Reactor Buildings and: portions of the Turbine Buildings at

.Dresden and Quad Cities were collected. .These pipe hangers along with the embedment plate locations have been' plotted on plan drawings for future use.

The-location of the embedment plate seams were also plotted. The data collected so far-includes hanger drawings which are in S&L's possession. Other AEs are being contacted in order to confirm that S&L has all applicable hanger drawings.

!~

Support drawings for conduit, cable tray, HVAC and L

small bore piping were not collected. Loading from l:

these supports is relatively light compared to that from large bore supports. -

2) ~ Generic embedment plate allowable loads have been

developed. Originally conservative hand calculations-t were used to develop the embedment plate allowable

[ loads. For this assessment a refined analysis using i.L a. finite element computer program has determined the OBE, SSE and upper limit allowable loads. The allowable loads are dependent on attachment size and attachment location relative to edges of the plate and strap anchors. The allowable loads were based on a. conservative (worst). location of the hanger attachment and a conservative (small) size of the hanger attachment. Based on the computer program, load deflection curves were developed for both the interior and exterior regions of the embedment plates.

These load deflection curves were used to develop the above mentioned allowable loads.

3) Using the embedment plate allowable-loads discussed in Item IV-2, the pipe hangers were sorted into two categories as follows:

a) Pipe hangers whose loads were within the allowable loads for the embedment plate and require no further action, and b) Pipe hangers whose loads were outside the allowable loads for the embedment plate. This second category was broken down further into the following:

i) Pipe hanger loads which are greater than the embedment plate upper limit.

(ii) Pipe hanger loads which are less than the embedment plate upper limit but greater than the embedment plate FSAR limits.

4) Based on the sort of hangers discussed in Item IV-3, a walkdown of pipe hangers whose loads exceed the embedment plates upper limit will be performed immediately and is in process at Dresden. A second walkdown of pipe hangers whose loads exceed the embedment plate FSAR limit will be performed at a later date.

Each walkdown and resulting assessment will consist of the following phases:

a) Perform a walkdown to confirm the visible as-built information such as attachment size and attachment location relative to the edges of embedment plates which could vary due to installation tolerances. In addition, the presence of other attachments in the vicinity of the attachment being walked down will be documented and this -

data will be included in further analysis.

b) Based on the information collected during the walkdown, a review will be performed to determine if further field investigation is necessary or if the loading on the embedment plate is acceptable.

.  ;)

• c) .If the hanger load.still exceeds the embedment plate allowables, the strap anchor spacing and plate orientation will_be determined by using ultrasonic testing.

d) Using the strap anchor locations another analysis will be performed. During this analysis it may be possible to take advantage of the relative location of the strap anchors with respect to the location of the hanger-load, i.e., if a load is located directly over or close to a strap anchor, sufficient embedment plate capacity probably exists.

Those hanger loads which exceed the allowable loads derived from this.second analysis will require further action.

V. Attachments The following attachments are included for your information:

1. Milestone bar chart - Dresden and Quad Cities

2. Summary Status - 2A Dresden*

2B Quad Cities

3. Number of embedded plates - 3A Dresden 3B Quad Cities

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.BOTT. OF SL AB DETAIL K PER S 8 L DESIGN DWG. (B-260) 9" -

9" -

9" -

9" -

E 7 9" _

9" _

9" _

PLAN VIEW - 9" ON CENTER STAGGERED STRAP SPACING l8" .

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18" _

18" _

DETAIL PER SHOP DWG.- 18" ON CENTER STAGGERED STRAP SPACING

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Att+chmevt I pagel GT 2. *. 'N Dr**det 263 Brr Chert f*r Embedmest plet* Resue R uslution ,. __ __3 I g_____,,,a Quad Cities 162 Bar Chart for Embedment plate Issue Resolution pgSW pt> CITtSS WEEK B E C I N N'T N C NONPAY ACTIVITY l 2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 - 3/16/87 3/23/87 3/30/87 4/6/87 4/13/87 4/?0/87 '4/27/87

• Ceco requests $6L's assistance l for one failed emb. plate at Dresden Unit 2 (2/II/87)

- $4L assesses failed plate and i informs Ceco that the strap spacing on emb. plate shop dwg. is different from S&L's design dwg.

- Ceco requests a review of ad-3 ditional shop dwas., a mockup plate ECN for UT calibration and determination of plate capacity per ahop dwg, detail.

Repair of failed plate is issued.

- S&L obtains prints of large bore hanger dwgs. with attach- --------- - - - - - -

ment to emb. plate.

- S&L prepares hanger location a dwas.

r ____--- _ _ _ - - -'--t

- .. _ --a

- $6L sorts and plots hanger i

attachments (drafting). In ------ ----- -i addition, S&L locates seams of *-~~--' * " " " - - - ""

emb. plates using piece marks on shup dwgs.

- S&L generates emb. Plate capacity, i

- S&L per forms an engineering i assessment and identifies those - ~ ~ ~ - - - 7 hangers which meet the shop dwg. "-~~~~~"

plate capacity and hence are of no concern, a

S&L performs a sort of remaining i hangers into those which may *-----

potentially affect piping system " ~ ~ ~ ~ ' " " -]

~

function and those for which the embedment plate FSAR allowables are escoeded, h i

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4 Atttachme,t 2A St-t** Summary y er Dresden

• APPROXIMATE NUMBER OF LARCE BORE PIPE MANCERS ON EMBEDDED PLATES DESCRIPTION Total la Unit in Unit Safety Nonsafety

1. 2 Reactor Turbine Loads) Loads)

1. 3 Related Related Bldg.

B1d4 Upper FSAR 4_____._.. Limit large bore hangers collected for follow-up work 2230 1060  !!70 750 1480 1460 770 I . .

' Result of first sort using generic 2 " x 2$" 440 230 210 170 3 l 270 380 60 at t ac hmen t size allowable limits (n.mber of i e 250 190 hangers requiring fo' low-up work) f Results of second so t using generir lagger 288 182 106 108 180 i

attachment size allowable limits where applicable 288 0 154 134 i see Note I

(number of hangers requiring follow-up work) -

j Result of walkdown and evaluation fer hangers

i

, with loads ) allowab!e upper limit s (number of j

hangers requiring fol low up work) l l t

- Phase ! - Visual data obtained frcm floor

.- Phase 11 - Utiliatr.g UT data for strap location  ;

t i

Result of walkdown and evaluation for hangers with  ;

load > allowable FSAP limits (number of hangers j requiring follow up sork) l l 8

- Phase i Visual data obtained from floor

- Phase 11 - Utiliairg UT data for strap location i The .

table above describes the results of large bore hanaer drawins collection, plotting and sorting. Numerical values represent number of hangers and are app 7ximate numbers.

Note la The second sort reduced the hangers requiring follow up work to 288 from 440.

bore hangers over safety related equipment in Turbine Building should also be assessed.During the week beginning March 9 1987, it was decided that non safety related large included in the next weekly report. The changes in the hanger numbers presented on this line due to this will be 4

e

~T Attachment 1B St't - Summary e ar-Qu'd Citt v APPROXIMATE NUMBER OF LARCE BORI PIPE MANGERS ON EMBEDDED PLATES DESCRIPTION Total In Unit In Unit Safety Nonsa fe t y Reactor Turbine Loads) Loads)

1. 2 #3 Related Related Bldg. Sids. Upper FSAE

• Limit Large bore hangers collected for follow up work Ansult of first sort using generic 2h" a 2h" attachment size allowable [tmit s (number of nangers requtring f o'. low up work )

disults of second sort using generic larger attachment size allowable limits where applicable (number of hangers requa rtng follow up work)

Numbers will be provided/

assult of walkdown and evaluation for hangers updated in the following wtth loads > allowable upper limits (rumber of hangers requiring foilow up work) Weekly Status Reports.

- Phase 1 - Visual deta obtained from floor

- Phase it - Ut illa ir.g UT dat a for strap location Result of walkdown and evaluation for hangers with load allowable FSAF limats (number of hangers requa r tng f ollow up work )

- Phase t - Vtsual data obtained from floor

- Phase ti - Utsttairg UT data for strap l ocat ion The t able above desc ribes the results of large bore hanter drawing co!!ection, plotting and sorting. Numerical values represent n4mber of hangers and are approximate numbers.

+

9

_$!b s "-~

Attachment #3A

Number-of Embedded Plates Dresden

The following table shows a breakdown of number of embedded plates with large bore pipe hangers attached to them. The .l

numbers indicated are approximate.

Bldg - Unit Unit #2- Unit #3 Total Reactor Building. 360 470 830 Turbine Building 90 100 190 Total 450 570 1020

~

IT e

Attachment #3B-Number of Embedded ~ Plates Quad Cities-The following table'shows a breakdown of number of embedded plates with large bore pipe hangers attached to them. The numbers indicated are approximate.

Bldg - Unit Unit #1' Unit #2 Total Reactor Building Numbers will be provided/

Turbine Building updated in the following Weekly Status Reports.

Total-1 I

-C- ;. .

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=,

Weekly Status Report Assessment of Embedment Plates Status as of March 8, 1987 Commonwealth Edison Company Dresden Station - Units 2 and~3 Quad' Cities Station - Units 1 and 2 March 12, 1987

r I. Introduction This is the first of a series of weekly reports which address the effort to resolve the issue regarding the embedment plates which were constructed with 18 in. strap anchor spacing. The purpose of this report is to update the Nuclear Regulatory Commission, Region III regarding the status for this effort. This first week report provides a brief-background of the issue and a plan of action for its resolution. Also included are attachments which will be updated on a weekly basis and provide statistics regarding the number of hangers which are affected and information regarding these hangers. A milestone schedule providing start and completion dates for the major items of work is also included.

II. Background On February 11, 1987, Commonwealth Edison Company (CECO) notified Sargent & Lundy (S&L) that the embedment plate which supports pipe hanger M-ll50D-62 at Dresden Unit 2 had been found to be deformed. Pipe hanger M-ll50D-62 consists of a rear-end bracket connected to a rigid strut that supports a 12 inch diameter core spray line. Commonwealth Edison Company asked S&L to investigate this plate and to provide a repair.

In the course of the investigation, S&L found that the strap anchor spacing shown on shop drawings for this embedment plate did not conform to the strap anchor spacing shown on the design drawing. The design drawing required a strap anchor spacing of 9 inches on center staggered, while the shop drawing showed a strap anchor spacing of 18 inches on center staggered (See sketch). A larger strap anchor spacing means that the embedment plate would have a lower load carrying capacity than originally intended.

The repair for the embedment plate supporting hanger M-ll50D-62 was issued on February 20, 1987 and has been completed in the field. The cause of the deformation of this plate is being investigated.

III. Immediate Action To resolve the discrepancy between design drawings and shop drawings, CECO has implemented two actions in parallel.

1) Perform ultrasonic inspection on some existing embedment plates at Dresden and Quad Cities Stations. The purpose of the inspection is to verify the strap anchor spacing. A mockup of an embedment plate with

_ ~ , -- . ~. - - - - - __ - - _ - = - ~ - _ _ .

..c .

(o i , ,

5 strapLanchors was constructed,and used to calibrate the ultrasonic test equipment.

t.

Using this UT equipment, Ltwo plates at Dresden have been ultrasonically examined and the strap spacing matches the shop. drawing.

i' A number of additional.in place embedmentiplates 4

~

are'being ultrasonically examined at both Dresden and. Quad Cities Stations.

^

.In. addition, CECO had reported'that there was a loose

.embedment plate with no hangersLattached at Quad 1

' Cities.. -This plate.has been examined and the strap

~ spacing. matches.that shown on shop drawing. No further action on this' plate is required. '

2) The second action performed in parall'elito_ verifying the strap anchor spacing is to collect large bore pipe hanger drawings-showing attachments to embedment plates and perform an engineering assessment as. described below. ,

l .

IV. . ' Data Collection and Engineering Assessment t

1

-Assuming thatothe tfr examination will confirm 18" ~ strap.

{ anchor spacing, a program of. data collection and an engineering i assessment'of the embedment plates using the shop drawing configuration has been initiated. This' assessment is described below.

j 1) Large bore pipe (24"'in diameter) hanger drawings i showing attachment to embedment plates in the Reactor F . Buildings'and_ portions of the Turbine Buildings at-Dresden and Quad Cities were collected. These pipe hangers'along.with the embedment. plate locations 4

have been plotted on plan drawings for future use.

The location of the embedrent plate seams were also plotted. The data collected so far includes hanger drawings which are in S&L's possession. Other AEs are being contacted in order to confirm that S&L has all applicable-hanger drawings. '

3' Support drawings for conduit, cable tray, HVAC and small bore piping were not collected. Loading from these supports is relatively light compared to that i ,

from large bore supports.

2) Generic embedment plate allowable loads have been i

, developed. Originally conservative hand calculations were used to develop the embedment plate allowable loads. For this assessment a refined analysis using a finite element computer program has determined

l. the OBE,-SSE and upper limit allowable loads. The allowable loads are dependent on attachment size and attachment location relative to edges of the plate and strap anchors. The allowable loads were

[  :

l

a O

based on a conservative-(worst) location of the hanger

• attachment hanger attachment.

and a conservative (small) size of the Based on the computer program, load deflection curves were develcped for both the interior and exterior regions of the embedment plates.

These load deflection curves were used to develop the above mentioned allowable loads.

3) Using the embedment plate allowable loads discussed in Item IV-2, the pipe hangers were sorted into two categories as follows:

a) Pipe hangers whose loads were within the allowable loads for the embedment plate and require no further action, and b) Pipe hangers whose loads were outside the allowable loads for the embedment plate. This second category was broken down further into the.following:

i) Pipe hanger loads which are greater than the embedment plate upper limit.

(ii) Pipe hanger loads which are less than the embedment plate upper limit but greater than the embedment plate FSAR limits.

4) Based on the sort of hangers discussed in Item IV-3, a

a walkdown of pipe hangers whose loads exceed the embedment plates upper limit will be performed immediately and is in process at Dresden. A second walkdown of pipe hangers whose loads exceed the embedment plate FSAR limit will be performed at a later date.

Each walkdown and resulting assessment will consist of the following phases:

a) Perform a walkdown to confirm the visible as-built information such as attachment size and. attachment location relative to the edges of embedment plates which could vary due to installation tolerances. In addition, the presence of other attachments in the vicinity of the attachment being walked down will be documented and this -

data will be included in further analysis, b) Based on the information collected during the walkdown, a review will be performed to determine if further field investigation is necessary or if the loading on the embedment plate is acceptable.

1 1

., , - . ..e-.. , , _ . , , . . , . .,..._,,,,.,._..,.nw,-,,

, I c) If the hanger lodd still .ixcer.ds the embedment plate allnyables, the strap ar,icnor spacing

• and plate orientation will be' determined by using ultrasonic. testing.

d) Using the strap anchor locations another analysis will be performed. During this analysis it may be possible to tgke advantage i

of the relative location'of the straia anchors with respect to the 1bca tion of theln' anger load, i.e., if a, load is located directly over or close to a strap anchor, sufficient embedment plate capacity probably exists.

Those hanger loads yhich exceed the allowable '

loads derived from this second analysis will require further action. ,

V. Attachments '

The following attachments are included for your information:

1. Milestone bar chart - Dresden and Quad Cities  ;

2. Summary Status - 2A.Dresden' "

2B Quad Cities

3. Number offembedded plates - 3A Dresden'.

3B Quad' Cities l

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DETAIL K PER S S L DESIGN DWG. (B-260) 9" -

9" _

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PLAN VIEW - 9" ON CENTER STAGGERED

, .s STRAP SPACING 9 >

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=

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L DETAll PER SHOP DWG.- 18" ON CENTER l' _ _-- __ . - ST_ AGGERED STRAP SPACING _ _. .- - . _ . ..

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Dr.edes 2' 3' Wr Ch+ rt i<r tabedmese pl+t* I mue Resolution

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Quad Cities 1&2 har_thart for Embedment plate issue Resolution gyggggagea quan cegegg WEEE BECINNINC MONDAY-ACTIVITY 2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 3/16/87 3/23/87 3/30/8Y 6/6/87 &/13/87 6/20187 6/27/87

• Ceco requests $4L's assastance S

l

' . pl. for one failed emb. place at 7

Dresden tinit 2 (2/11/87) ,

- S&L assesses f at S *4 plate and i

, informs CEC 6 that'1be strap

• 4 spacing on emb. plate shop dwg. is differert from S&L's design dvs.

- Ceco requests a review of ad- g ditional shop dwas., a mockup plate ECN for UT calibration and determination of plate capacity per shop dws, detail.

Repair of f ailed plate is ,,

assmed, s

- S&L ebtains prints of large bore hanger dwgs. math attach- -------------"

~ ~ ~ ~ ~ ~ ~ ~ '"~~~~~

ment to emb. plate.

~ $4L prepares hanger location a dwgs. m---- - - - - - - - -s w--- _-. ---- ...a

- S&L sorts and plots hanger ,

at tachment s (draf t ing). In m----- ----- --.g addition. S&L locates seams of """""*'""""" ""

emb. P l ates using piece marks on shop dwgs.

A

- 5&L generates emb. plate capacity. i '

- S&L per forms an engineering i assessment and identifies those - - - - - - - -g hangers which meet the shop dwg. ~ ~ ~ ~ ~ " * *

• plate capacity and hence are of no concern.

- S&L performs a sort of remaining f t j hangers into those which may

, potentially affect piping system ' " " ~ ~ ~ ~ ~ ~]

function and those for which the sabedment plate p5AR allowables f. i are enceeded.

• I I

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ue - 4 Attachmert 1 (Continued) .. Page 2 (f 2 '

Dresden 263 Bar Chart for Embedment Plate issue Resolution

• Quad Cities 167 Bar Chart for Embedment Plate issue Resolution WEEE 3*C1ma1NC M0NDAY '

ACTIVITY 2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 3/16/87 3/23/87 3/30/87 4/6/87 4/13/07 '4/20/87 4/27/87

- wuczco perrores a vatteown for these hangers which may Qw* CopeTsesuge46 potentially affect piping (*,j g,C004TMuu shME system analysis and determine attachment location relative to edges of emb. P late and strap. If necessary. Ceco-performa UT for otrap location.

- $6L utilizes walkdown data to perform a sort of these hangers to identify those hangers which still may potentially af fect piping system analysis.

- S&L/ Ceco per form a walkdown for those hangers which may potentia!!y cause embedment plate FSAR allew-ables to be exceeded.

- Assess these hangers based on walkdown data and issue repairs as necessary.

i r

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e

Attrachaelt 2A '

St-tus Summary e 2 Dresden APPROXIMATE NUMBER OF LARCE BORE P!PE HANCERS ON EMBEDDED PLATES DgSCRIPTION Total In Unit In Unit Safety Nonsafety

1. 2 Reactor Turbine Loads) Loads)

1. 3 Related Related Sids. 81ds. Upper PSAR 4_. Limit Large bore hangers co!!ected for follow-up work 2230 1060 1170 750 1480 1 1460 770 I . .

Ersuit of first sort using generic 2b" x 2$" 440 230 210 170 l 270 attachment size allowable limits (nember of 3

'fd0 60 250 j

8 190 hangers requiring follow up work) .  ;

{

Results of second so t using generic larger 288 182 l 106 { 108 180 288 attachment size allowable limits where applicable '

! O 1% 1 34 See Note 1

, (number of hangers requiring follow-up work) .

jResult of walkdown and evaluation fer hangers .

i

with loads > allowab;e upper limits (number of ' j

' hangers requiring fo!!ow-up work) f ,

f

- Phase 1 - Visual data obtained frem t!oor

- Phase it - Utilizirg UT data for strap location f  ;

. Result of walkdown and evaluation for heters with f load e allowable FSAF limits (number of hangers ,

j requiring follo up sork) l l 5

j i

- Phase 1 - Visual d4ta obtained from floor

- Phase 11 - Utillattg UT data for strap location  !

~ - . -

The table above describes the results of large bore hanger drawina collection. Plotting and sorting. Numerical values represent number of hangers and are app'oximate numbers.

Note 13 The second sort reduced the hangers requiring follow-up work to 288 from 440.

bore hangers over safety-related equipment in Turbine Sutiding should also be assessed.During the week beginning March 9.1987, it included in the next weekly report. The changes in the hanger numberswas decided that non-safety related large presented on this line due to this w111 be

(

, '. I fttachment 2B St<tua Summary * *R Quad Cit ies APPROXIMATE NUMBER OF LARGE BORE PIPE MANGERS ON EMBEDDED P!ATES DESCRIPTION Total in Unit In Unit Safety Nonsafety

1. 2 Reactor Turbine 1. cad s) Loads)

1. 3 Related Related Bldg. 81dg. Upper FSAR

• Limit Large bore hangers collected for follow up work Result of first sort using generic 2h* a 2h" attachment size allowable Ismits inumber of hangers requiring fo'. low up work )

Results of second so-t using generic larger attachment size allowable limits where app!! cable (number of hangers requa ring follow up work)

Numbers will be provided/

Result of walkdown and evaluation for hangers updated in the following with loads > a!!owable upper limits (number of hangers requiring fo' low *up work) Weekly Status Reports.

- Phase 4 - Visual dera obtained from floor

- Phase ti - Utillatrg UT data for strap locataon Result of waludown and evaluation for hangers with load allowable F5A F limats (number of hangers requarang fo!!uw up work)

Phase t - Visual data obtained from floor

- Phase to - Ut il tr arg UT Jare for strap location The table above describes the results of IdrRe bore hanter drawina collection, plotting and sorting. Numerical values represent number of hangers and are approutmar e numbers.

v. . -.

3. _ ' * -

-Attachment'#3A Number of' Embedded Plates Dresden-sThe'following table shows a breakdown of number of embedded plates with large bore pipe hangers attached to them. The numbers indicated are approximate.

Bldg  : Unit' Unit #2 Unit #3 Total Reactor. Building 360 470 830 Turbine Building 90 100 190 Total 450 570 1020 l

-,; +-

Attachment #3B Number of Embedded Plates Quad Cities The following' table shows a breakdown of number of embedded plates:with large bore pipe hangers attached to them. The numbers indicated are approximate.

Bldg - Unit Unit #1 Unit #2 Total Reactor Building Numbers will be provided/

Turbine Building updated in the following Weekly Status Reports.

Total l l

. , - . - ~ . - -- - - . > ,

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p.

9-g-Weekly Status Report

. Assessment of Embedment Plates Status as of March8, 1987 Commonwealth Edison Company

.Dresden Station Units 2 and 3 Quad Cities Station - Units 1 and 2 March 12, 1987

3 a

I. Introduction This is the first of a series of weekly reports which address the effort to resolve the issue regarding the embedment plates which were constructed with 18 in. strap anchor spacing. The purpose of this report is to update the Nuclear Regulatory Commission, Region III regarding the status for this effort. This first week report provides a brief background of the issue and a plan of action for its resolution. Also included are attachments which will be updated on a weekly basis and provide statistics regarding the number of hangers which are affected and information regarding these hangers. A milestone schedule providing start and completion dates for the major items of work is also included.

II. Background On February ll, 1987, Commonwealth Edison Company (CECO) notified Sargent & Lundy (S&L) that the embedment plate which supports pipe hanger M-1150D-62 at Dresden Unit 2 had been found to be deformed. Pipe hanger M-ll50D-62 consists of a rear-end bracket connected to a rigid strut that supports a 12 inch diameter core spray line. Commonwealth Edison Company asked S&L to investigate this plate and to provide a repair.

In the course of the investigation, S&L found that the strap anchor spacing shown on shop drawings for this embedment plate did not conform to the strap anchor spacing shown on the design drawing. The design drawing required a strap anchor spacing of 9 inches on center staggered, while the shop drawing showed a strap anchor spacing of 18 inches on center staggered (See sketch). A larger strap anchor spacing means that the embedment plate would have a lower load carrying capacity than originally intended.

The repair for the embedment plate supporting hanger M-1150D-62 was issued on February 20, 1987 and has been completed in the field. The cause of the deformation of this plate is being investigated.

III. Immediate Action To resolve the discrepancy between design drawings and shop drawings, CECO has implemented two actions in parallel.

1) Perform ultrasonic inspection on some existing embedment plates at Dresden and Quad Cities Stations. The purpose of the inspection is to verify the strap anchor spacing. A mockup of an embedment plate with s.;

strap > anchors wasLconstructedfand.used to calibrate' theLultrasonic. test _ equipment. Using this UT equipment,-

Lt wolplates at=Dresden have been ultrasonically examined

'and the-strap spacing matches-the shop drawing LA numberoofm additionalnin place =embedment plates are being ultrasonically examined at both'Dresden and Quad-Cities Stations.1 InLaddition, CECO had reporte'd that there was a loose embedment plate with no hangers attached at Quad

. Cities. This plate.has been examined and the-strap spacing matches that shown on shop ~ drawing. No-further action on this. plate is required.

2) -The second action performed in parallel to verifying

-the' strap anchor spacing is to collect large bore pipe: hanger drawings showing attachments to embedment plates and perform an engineering assessment as described below.

IV. Data Collection and Engineering Assessment Assuming that the UT examination will confirm 18" strap anchor spacing, a program ~of data collection an'd an engineering-assessment of the embedment plates using the shop drawing configuration has-been initiated. This assessment is described below.

1) .Large bore pipe (24" in diameter) hanger drawings-showing attachment to embedment plates in the Reactor Buildings and portions of the Turbine Buildings at Dresden and Quad Cities were collected. These pipe hangers along with the embedment plate locations have been plotted on plan drawings for future use.

The location of the embedment plate seams were also plotted. The data collected so far includes hanger drawings which are'in S&L!s possession. Other AEs are being contacted in order to confirm that S&L has all applicable hanger drawings.

Support drawings for conduit, cable tray, HVAC and small-bore piping were not collected. Loading from these supports is relatively light compared to that from large bore supports. ,

2) Generic embedment plate allowable loads have been developed. Originally conservative hand calculations were used to develop the embedment plate allowcble loads. For this assessment a refined analysis using a finite element computer program has determined the OBE, SSE and upper limit allowable loads. The allowable loads are dependent on attachment size and attachment location relative to edges of the plate and strap anchors. The allowable loads were 9

based on a conservative (worst) location of the' hanger

• attachment and a conservative (small) size of the hanger attachment. Based on the computer program, load deflection curves were developed for both the interior and exterior regions of the embedment plates.

These load deflection curves were used to develop the above mentioned allowable loads.

3) Using the embedment plate allowable loads discussed in Item IV-2, the pipe hangers were sorted into two categories as follows:

a) Pipe hangers whose loads were within the allowable loads for the embedment plate and require no further action, and b) Pipe hangers whose loads were outside the allowable loads for the embedment plate. This second category was broken down further into the following:

i) Pipe hanger loads which are greater than the embedment plate upper limit.

(ii) Pipe hanger loads which are less than the embedment plate upper limit but greater than the embedment plate FSAR limits.

4) Based on the sort of hangers discussed in Item IV-3, a walkdown of pipe hangers whose loads exceed the embedment plates upper limit will be performed immediately and is in process at Dresden. A second walkdown of pipe hangers whose loads exceed the embedment plate FSAR limit will be performed at a later date.

Each walkdown and resulting assessment will consist of the following phases:

a) Perform a walkdown to confirm the visible as-built information such as attachment size and attachment location relative to the edges of embedment plates which could vary due to installation tolerances. In addition, the presence of other attachments in the vicinity of the attachment being ,

walked down will be documented and this data will be included in further analysis.

b) Based on the information collected during the walkdown, a review will be performed to determine if further field investigation is necessary or if the loading on the embedment plate is acceptable.

U- . -

t.

c) If the hanger load still exceeds the embedment

=* plate allowables, the strap anchor spacing Land plate orientation will be determined by using ultrasonic testing.

d) Using the strap anchor locations.another analysis will be performed. During this analysis it may be possible to take advantage of the relative location of the strap anchors with load, respect to the location of the hanger i.e., if a load is located directly over or close to a strap anchor, sufficient embedment plate capacity probably exists.

• Those hanger loads which exceed the allowable loads derived from this second analysis

j. will require further action.

V. Attachments The following attachments are included for your information:

1. Milestone bar chart - Dresden and Quad Cities

2. Summary Status - 2A Dresden' 2B Quad Cities

3. Number of embedded plates - 3A Dresden 33 Quad Cities

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PLAN VIEW - 9" ON CENTER STAGGERED STRAP SPACING 18" -

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-3

, 9 Atttachment 2A

$ratus Summary

• Dresden APPROX! MATT NUh5Et OF LAACE Song PIPE MANCER$ ON EMBEDDED FIAITS DESc3IMIon Tora! la Uutt in Unit I Sa fety Nossafety

1. 2 Reactor Turbine Loads) Leads)

1. 3 Related Related 81d3 , 3143 Upper FSAR

_ .. Limit Large bore hangers collected for follow up work 2230 1060  !!70 250 t 1480 1460 770 . .

Esselt of first sort using generic .6" a 2%" 440 230 i 210 170 f 270 380 60 at t achment size a!!awable laatts (nomber of l

• 250 190 hangers requiring fo: low up work) ,

t l h

Results of second so t estag generte larger 288 182 106 108 180 l '

288  ! O 154 attachment size allowable Itates where applicable ' 134 See Note 1

, (number of hangers requiring follow-up work) ,

i

,Sesult of walkdown and evalmatian fcr hangers .

with loads > allowab;e apper limits (member of 'i j

' hangers requiring fe;1ow up woral {

a

, l t

i

- Phase 4 - Visual data obtained frem floor

- Phase ti - Ut:11str a UT data for strap location I

.i I

Bes.It of walkdown and evaluation for hangers with l

,1044 attawable FSAP liants (number of hangers .

j irequartas I*II****P " fkI I k I

! l i

! i '

I - Phase 4 - Visual d.ta obtained from floor l

- Phase it - Ut t!&s tr.g UT data for st rap location

-_m.._. __. , . _ . _

The table above descrtbes the results of large bore hanger drawina collection. Pl otting and sorting, heerical values represent number of hangers and are app ostmare numbers.

hee to The second sort reduced the hangers requiring follow up work to 288 f rom 440.

bore hangers over safety-related equipment in Turbine Building shaeld also be assessed.

During the week beginning March 9, 1987, it was decided that non safety related large incInded in the nest weekly report. The changes in the hanger numbers presented on this line due to this will be l

l l

l l

l l

.i e t-Attachment 2B Stat = Summary * * '

- Quad Clttw APPROXIMATE NLh8ER OF LARCE 8032 FIPE RANCiks ON EMBEDDED PLATES DESCRIPTlos Total la Unit In Unit Safety Noasafety Reactor Turbine Loads) Leads)

1. 2 #3 Related Related 81d 3. 81d 4. Upper FSAR Lamat

• Large bore hangers ce!!ected for follow sp work Aesult of first sort metag generic 2\" u 2$"

attachment saae allowable laste s (awaber of hangers requarang f o: low up work)

Rosett s of second so-t estas generte larger at t ac hment stae allowable limats where applicable (must>er of hangers requiring fellow up work)

Numbers will be provided/

Res=!r of walkdown and eval =atten for hangers updated in the following with neede > allowable opper limats (member of hangers requir aag failow up work) Weekly StatG5 Reports.

1

- Phase a - Visual meta obtatmed from floor

- Phase s a - Ut tlas tra UT d4ta for st rap locat ion Resett of walsa m and evateattom for hangers wath lead allowable F5As t amars (member of bangers rewarams fellow up werb)

- Pnese a - Yts al d4ta ottataed from floor

[ - Phase as - Ot tias ar g UT data for st rap locat aos The table ahoee des <rabes the results of large borg banger draggag ge{3*ctica. Pl otting and sorting.

Numerical values represent number of h4ngers and are approntaate numbers.

7 -_

4 Attachment #3A Number of Embedded Plates Dresden The following table shows a breakdown of number of embedded plates with large bore pipe hangers attached to them. The numbers indicated are approximate.

Bldg - Unit Unit #2 Unit #3 Total Reactor Building 360 470 830 Turbine Building 90 100 190 Total' 450 570 1020 l

l i

l F

l

\

l

'.p Attachment #3B Number of-Embedded Plates Quad Cities

'The-following. table shows a breakdown of number of embedded plates with large bore pipe hangers attached to them. The numbers indicated are approximate.

Bldg - Unit Unit #1 Unit #2 Total Reactor Building Numbers will be provided/

Turbine Building updated in the following Weekly Status Reports.

Total l l l

t.

s.: .,

.;, .; i .

l'

. e, Weekly Status Report Assessment of Embedment Plates Status as of March 8, 1987 Commonwealth Edison Company Dresden Station - Units 2 and 3 Quad Cities Station - Units 1 and 2 March 12, 1987

. - - . - ,_,--,-,-.,,..n..,., , _ , . , _ , . , . . . . , . , .

..---, ,~ --....-_, _.- ,-._,,,,-,,, .. ,,,_,-

r-I. Introduction.

'e This is the first of a series of weekly reports which address the effort to resolve the issue regarding the embedment plates which were constructed with 18 in, strap anchor spacing. The purpose of this report is to update the Nuclear Regulatory Commission, Region III regarding the status for this effort. This first week report provides a brief background of the issue and a plan of action for its resolution. Also included are attachments which will be updated on a weekly basis and provide statistics regarding the number of hangers which are affected and information regarding these hangers. A milestone schedule providing start and completion dates for the major items of work is also included.

II. Background On February 11, 1987, Commonwealth Edison Company (CECO) notified Sargent & Lundy (S&L) that the embedment plate which supports pipe hanger M-ll50D-62 at Dresden Unit 2 had been found to be deformed. Pipe hanger M-1150D-62 consists of a rear-end bracket connected to a rigid strut that supports a 12 inch diameter core spray line. Commonwealth Edison Company asked S&L to investigate this plate and to provide a repair.

In the course of the investigation, S&L found that the strap anchor spacing shown on shop drawings for this embedment plate did not conform to the strap anchor spacing shown on the design drawing. The design drawing required a strap anchor spacing of 9 inches on center staggered, while the shop drawing showed a strap anchor spacing of 18 inches on center staggered (See sketch). A larger strap anchor spacing means that the embedment plate would have a lower load carrying capacity than originally intended.

The repair for the embedment plate supporting hanger M-1150D-62 was issued on February 20, 1987 and has been completed in the field. The cause of the deformation of this plate is being investigated.

III. Immediate Action To resolve the discrepancy between design drawings and shop drawings, Ceco has implemented two actions in parallel.

1) Perform ultrasonic inspection on some existing embedment plates at Dresden and Quad Cities Stations. The purpose of the inspection is to verify the strap anchor spacing. A mockup of an embedment plate with

=

strap anchors'was constructed and used to calibrate

• the ultrasonic test equipment. Using this UT equipment, two plates at Dresden have been ultrasonically examined

-and the strap spacing matches the shop drawing.

A number of additional in place embedment plates are being ultrasonically examined at both Dresden

-and Quad Cities Stations.

In addition, Ceco had reported that there was a loose

~

embedment plate with no hangers attached at' Quad Cities. This plate has been examined and the strap spacing matches that shown on shop drawing. No further action on this plate is required.

2) The second action performed in parallel to verifying the strap anchor spacing is to collect large bore pipe hanger drawings showing attachments to embedment plates and perform an engineering assessment as described below.

IV. Data Collection and Engineering Assessment Assuming that the UT examination will confirm 18" strap anchor spacing, a program of data collection and an engineering assessment of the embedment plates using the shop drawing configuration has been initiated. This assessment is described below.

1) Large bore pipe (24" in diameter) hanger drawings showing attachment to embedment plates in the Reactor Buildings and portions of the Turbine Buildings at Dresden and Quad Cities were collected. These pipe hangers along with the embedment plate locations have been plotted on plan drawings for future use.

The location of the embedment plate seams were also plotted. The data collected so far includes hanger drawings which are in S&L's possession. Other AEs are being contacted in order to confirm that S&L has all applicable hanger drawings.

Support drawings for conduit, cable tray, HVAC and small bore piping were not collected. Loading from these supports is relatively light compared to that from large bore supports.

2) Generic embedment plate allowable loads have been developed. Originally conservative hand calculations were used to develop the embedment plate allowable loads. For this assessment a refined analysis using a finite element computer program has determined the OBE, SSE and upper limit allowable loads. The allowable loads are dependent on attachment size and attachment location relative to edges of the plate and strap anchors. The allowable loads were

.3-

based on a conservative (worst) location of the hanger

• attachment and a conservative (small) size of the hanger attachment. Based on the computer program, load deflection curves were developed for both the interior and exterior regions of the embedment plates.

These load deflection curves were used to develop the above mentioned allowable loads.

3) Using the embedment plate allowable loads discussed in Item IV-2, the pipe hangers were sorted into two categories as follows:

a) Pipe hangers whose loads were within the allowable loads for the embedment plate and require no further action, and b) Pipe hangers whose loads were outside the allowable loads for the embedment plate. This second category was broken down further into the following:

i) Pipe hanger loads which are greater than

the embedment plate upper limit.

(ii) Pipe hanger loads which are less than the embedment plate upper limit but greater than the embedment plate FSAR limits.

4) Based on the sort of hangers discussed in Item IV-3, a walkdown of pipe hangers whose loads exceed the embedment plates upper limit will be performed immediately and is in process at Dresden. A second walkdown of pipe hangers whose loads exceed the embedmont plate FSAR limit will be performed at a later date.

Each walkdown and resulting assessment will consist of the following phases:

a) Perform a walkdown to confirm the visible as-built information such as attachment size and attachment location relative to the edges of embedment plates which could vary due to installation tolerances. In addition, the presence of other attachments in the vicinity of the attachment being

, walked down will be documented and this

• data will be included in further analysis.

b) Based on the information collected during the walkdown, a review will be performed to determine if further field investigation is necessary or if the loading on the embedmont plate is acceptable.

-4 -

t

. c) If the hanger load still exceeds the embedment

• plate allowables, the strap anchor spacing and plate orientation will be determined by using ultrasonic testing.

d) Using the strap anchor locations another analysis will be performed. During this analysis it may be possible to take advantage of the relative location of the strap anchors with respect to the location of the hanger load, i.e., if a load is located directly over or close to a strap anchor, sufficient embedment plate capacity probably exists.

Those hanger loads which exceed the allowable loads derived from this second analysis will require further action.

V. Attachments The following attachments are included for your information:

1. Milestone bar chart - Dresden and Quad Cities

2. Summary Status - 2A Dresden' 2B Quad Cities

3. Number of embedded plates - 3A Dresden 3B Quad Cities

-S-

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"* ,, , ,, $*!a. ."

6" PL.I/2" X 9" .

BOTT. OF SLAB DETAIL K PER S S L DESIGN DWG. (B-260) 9" 9" 9" 9" I 7 9" 9" _

9" =

PLAN VIEW -9" ON CENTER STAGGERED STRAP SPACING 18" -

7 7 18" _

18" =

DETAIL PER SHOP DWG.- 18" ON CENTER STAGGERED STRAP SPACING _ _ _

E' .

At t achae+t 1 Paget of 2 e e-pr=-dee 263 mar Chere tw tabedee<* pl< te i=we mesel reen ,. --__,

E ' s. --a Quad Cteses l&2 Sar Chart for Embedeent plate issue Beseletten pgmag pgs c,pegg ,

WEEE 8EC1NN1NC NONDAY ACTIVITT 2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 1/16/87 1/23/87 1/30/8Y 4/6/87 4/13/87 4/20/87 4/27/87

- cue rew.t. 5 t . ..assta.ce a for ese fa!!ed enh. plate at pressee Dett 2 (2/11/87)

. $6L assesses f atted place and i taferee CECe that the strap spectag en enh. plate shop dwg. te different free $6L's destge dvs.

- CICe requests a reetew of ad- g dat tomat shop dwgs.. a mockey plate ECN for CT calibrattee and deteresset tee of plate capacaty per shop dws. detail, sepaar of fatted plate as assmed.

- S&L obtaans Frants of large bore hanger dwgs, with attach- r-----= ----m meat te emb. plate. * * ~ ~ ~ - -" - - - - - *

- 5&L prepares hanger locattee a dwgs. F----~~~- - - - - - -

-a w--- .. - - ...e

- S&L sorts and plats hanger ,

acrecheemts (drafting). In r.----- ----- -,

addit son, 54L locates seams of * - " " - * -'---~~ - - "

• enh. plates e.asag piece marks en shop dwgs.

- S&L generates emb. plate capacity. t i 5.L performs an engineertag ,

assesseest and adentif tes these - - - - - - - -g hangers whsch meet the shop dwg. * - - - ~~ - *

• P l ate capactty and hence are of me concers.

- $6L performe a sort of reestaang i hangere late those which may -----

poteat tally af fect pipios systen " ~ " * - "'--]

fuett son and these for which the enhedeent plate FSAR allowables are escoeded.

i I

e

D

6. O retachment 1 (Continued) . Page2 of 2 Dresden 263 Bar Chart for Embedeent Plate issue tasolution '

Quad Cittee 1&2 Bar Chart far Embedeent Plate issue tesolutten vttt 3gC1Nu!NC M0NDAY ACTIVITY '

2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 3/16/87 3/23/87 3/30/F7 4/6/87 6/13/87 6/20/87 6/27/47 m L/ cur,e perrores a vet r --

for those hangers which any uW> ConsTseegge46 poteattelly affect piptag system analysis and deteresse CW> COs4Tescu esNim attachneet locattom relative to edges of emb. plate and strap. If necessary Ceco performa UT for otrap locatten.

- $6L wttlises walkdown data to perfere a sert of these hengers to identif y these hangers whsch still say potentially af fect piptag systes analysts.

4

- S&L/ Ceco perform a walkdawn for these hangers which may potentially cause embedeent plate FSAs allow-ables to be esceeded.

i

- Assess these hangers based on walkeown data and 6ssue repairs as necessary.

r h

. o At t r ac hment 2A Status Summaary 8

• Dresden AFPROXIMATE NUMBER OF IJLRCE BORE FIFE MANCERS ON EMBEDDED r!.ATES Total la Unit In !!ait Safety Nossafety Reacter DESCRIPTION

1. 2 Turbine Load s .* Loads)

1. 3 Related Related aldg. Bldg. Upper F$AR ,

Limit Large bore haegers ce!!ected for follow up work 2230 1060 1170 750 1480 1460 77u . .

Result of first sort using generic 24" x 2%" 440 230 210 170 l 270 380 60 attachment saae a!!owable Ismat s (a<sber of 8 250 190 j

hangers reqetring f e'. low-up wors )

I l t

i ,  !'

, Re s.It s o f second so-t wanns generte larger 28a 182 106 l 108 180 288 O 154 stae a!!owable tamats where applicable 1 34 See Note I fattachment (nuecer of hangers requarang follow up work) j ,I j

i i R e sis *t of walkdm ar.d evaluation fer hangers l

, I i wa:P t' ads > allowab:e upper lian t s (number of 8

, heaters requiring f a: low up work) l l

- 'l

- Phase a - Vasual d,ta obtained f rem fi.ar \

i  !

t

- Phase la - Ur a liz ar g L7 s.ta for strap locarace l

E. s=1r o f walkdawn and evalaa.c ao a for hangers wath h l l 8

ae44 .11awante Fiar- es.s (raaber et A.ngers ' [

f i l

rewarama fellow p sork) I 8 f '

i I -

g J

,- Ph.se a - V a sual 4.t a .:- 147 .ed from floor l. - .

I rw.se na - cr a t a m ar g UT dat a for e r. I i- ac atton L I i .

. - - - , . . . i s . _ . , - . . .1 - ,e . - . _ ---

The taste above descr abes the ress. tc af 64sge bore Itanaer drawana .o11ec a lon. Plot t ang and sorting. Numerical values represent number of hangers and are ,pp om a=>'.e num* ers.

we I: The suond sort c e4.(ed tb4 p gers requia--- f dI w wp work to 288 from 440 -

e.-ring the week beginning Parch 9, 191,, it was de:taed t hat non-safety related large bese sac hainsers A.ded t heover

.-t safe.g wecal. r,la'at rep..t.egenpuest sa furbine Sullding show14 also be assessed. The thanges in t!.e hanger numbers presented on this time ese to abja w188 be s

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States Summary a

• d

' - bad CetI w d

! .2 ,

I I

• AFFROXIMATE W it OF 1ARGE St?! PIPE MANGERS ON EMBEDDED PLATES u

DE W FTIN ht al la Unst In Unit Safety 4 4 safety Reactor

( 3 82 #3 Belated Turbine Loads

• Loads) belated Bldg.

Sids. Upper FSAR Limit

• i tasse bore hengers cellected for fellow ep work _

p f

l

. ~ .

s

's -

• seselv of lit,t must estag gengesc ?h" t h" lr -

, ,f at t ehst stre'Alowette limits (awater of ~-

hangere requarang fo'. low-up wochi ,

~

. l1 l-g -

Re> It s of sech sort estag genertc larger '

k at t ac hment stae allowable lanats where applicable f amber of hangers req =artog f allow .y wort * -

l <

l maatber:s wall be provsdert/ _

g .

Result of wathdown and eeal.ation for hangers updated is thesfollowir.y 8 with lease ) a!!ewable opper limats (number of I ,

hangers requit tag follow up w ark) '

NdeltIY Status R& ports. / L-

, .s

- Phase a - V a sual da t a obt ained free floor '

- Phase a s - !!t ilta nts UT data for st rap location Res It of walkdown and eval atten for hangers with load - allowable F5AF lamats (number of hangers requaring follow up wrk)

- Ph4se a - Visual d4t a obtained f ree floor

- Pha se at - tItaltases t!T date for strap locatten

. . - _ ~ . .

The table above describes the results of large bore hanaer dravaan collection, plotting and sorting. Numerical values represent number of hangers and are approntmate numbers, e

Attachment #3A N

Number of Embedded Plates Dresden The following table shows a breakdown of number of embedded l plates with large bore pipe hangers attached to them. The numbers indicated are approximate.

s Bldg - Unit f Unit #2 Unit #3 Total

! Reactor Building 360 l 470 830

).

Turbine Building 90 100 190 Total 450 570 1020

)

i 6

i. *

~

f..

>^

Attachment #3B Number of Embedded Plates Quad Cities The following table shows a breakdown of number of embedsled plates with large bore pipe hangers attached to them. The numbers indicated are approximate. .

Bldg - Unit Unit #1- Unit #2 Total Reactor Building Numbers will be provided/

Turbine Building updated in the following Weekly Status Reports.

Total l l

.