ML17199T444

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Forwards 870423 Status Rept Describing Progress in Resolving Questions About Installed Configuration of Embedment Plates, Per
ML17199T444
Person / Time
Site: Dresden, Quad Cities, 05000000
Issue date: 04/24/1987
From: Johnson I
COMMONWEALTH EDISON CO.
To: Davis A
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
2855K, NUDOCS 8712010002
Download: ML17199T444 (19)
v • d • e


Text

Common.alth Edison e

Cne First National Plaza, Chicago, Illinois Address Reply to: Post Office Box 767 Chicago, Illinois 60690

  • 0767 Mr. A. Bert Davis Acting Regional Administrator U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL. 60137 April 24, 1987 subject:

Dresden station Units 2 & 3 Quad Cities Station Units 1 & 2 "Ernbedment Plate Status Report" NRC Docket Nos. 50-237, 249, 254 & 265

Dear Mr. Davis:

As agreed in Mr. c. Reed's letter to you dated March 6, 1987, attached is a status report dated April 23, 1987, describing our progress in resolving questions about the installed configuration of ernbedment plates at Dresden Units 2 and 3 and Quad Cities units 1 and 2.

so Nuclear Licensing Administrator

/klj att.

cc:

M. Grotenhuis-NRR T. Ross-NRR M. Ring-RIII 2855K 8712010002 870424 PDR ADOCK 05000237 R

PDR

Weekly Status Report Assessment of Embedment Plates Status as of April 23, 1987 Commonwealth Edison Company Dresden Station - Units 2 an~ 3 Quad Cities Station - Units l and 2 April 23, 1987

I.

Introduction This is the seventh of a ser~es of weekly reports which address the effort to resolve the issue regarding the embedment plates which were constructed with strap anchor spacing other than those used in the design.

The purpose of this report is to update the Nuclear Regulatory Commission, Region III regarding the status for this effort.

This seventh weekly report consists of a summary of work performed during last week.

II.

Dresden Station Per the Milestone Bar Chart (Attachment 1), a walkdown at Dresden is continuing.

The previous two Weekly Status Reports had indicated that some ultrasonic test results have shown strap anchor spacings of 24 (+/- l") on center.

It was also mentioned that the 24" spacing will have a minimal impact on the overall assessment program.

Analytical confirmation of this is in progress.

It was also mentioned that the 24" spacing appeared to be the result of either a detailer-fabricator interface not recorded on the detail drawing or a misinterpretation of the detail drawing.

We now believe that the 24" spacing resulted from a misinterpretation of the detail drawing.

Appendix A of this report describes the basis for this assertion.

Due to high radiation in areas of the plant, 20 hangers are presently inaccessible.

Walkdowns for these hangers will be performed when conditions permit.

Attachments 4A and SA show the current cumulative status of work progress.

Effects of 24" spacing of strap anchor has not yet been incorporated into the numbers presented in attachments.

III.

Quad Cities Station Per the Milestone Bar Chart (Attachment 1), the walkdown at Quad Cities is continuing.

The current cumulative status is indicated in Attachment 4B.

Due to high radiation in areas of the plant, 18 hangers are presently inaccessible.

Walkdowns for these hangers will be performed when conditions permit.

A number of ultrasonic test results have been received for evaluation.

These test results indicate a strap anchor spacing of 18" on center.

Attachment SB shows the present status of ultrasonic testing data and resulting embedment plate assessment.

IV.

Attachments The following attachments are included in this weekly report.

1.

Milestone Bar Chart -

Dresden and Quad Cities

2.

Summary of Status -

2A Dresden 2B Quad Cities

3.

Number of Embedment Plates -

3A Dresden 3B Quad Cities

4.

Phase i -

Walkdown and Evaluation Status Summary 4A Dresden 4B Quad Cities S.

Phase ii -

Walkdown and Evaluation Status Summary SA Dresden SB Quad Cities

6.

Appendix A -

24 inch Anchor Spacing Note:

Attachments 1, 2 and 3 have not changed.

Attachment 4A, 4B, SA and SB have been revised to show current cumulative status.

Appendix A has been added.

ACT! VI TY CE Co ft:'ljUl:S t S Sb.LI s assistance for one failed t.:mb. p l.1 ( c al llt c :;dt*n ll11it 2

(~/I I /H 7)

SH a~SC!iSCS railed pl.:J( c and in forms CE Co th Jr l lie strap spacint~ on cmL. pl.it c sl1up dw~. i!; di ff c rcn t f JUUi S!.L' s design dwg.

CE Co request& a revic1J of ad-di t ion al shop d\\o/g6.* a mock up plate ECN for UT ca I ilir.lt ion and dctcrminal ion of plate capat:ity per shop dwg. det a i I.

Re pJ i r of failed pl at l' is issued.

S!.L obcains pr i IH S of large bore hanger dwgs. with attach-ment to emb. place.

S!.L prepares han~cr location dwgs.

56.L sorts and plots hanger att.achment& (drafting).

In addition, 56.L locates seams of emb. plates using pi1:ce marks on shop dwgs.

56.L gt:nerates cmL. plate capacity.

S6.L perform& an engineering assessment and 1dcnt i fies those hangers which m~cl the shop d\\o/g.

plate capacity and hence a re of no concern.

56.L performs a sort of remaining hangers into those "hi ch may potentially al feet piping system function and those for "'hi ch the embedment plate FSAR al lowables a re exceeded.

~~1m1:ntJ..

Dresden 20) Bar Chart for EmLedment Plate Issue Resolution Quad Cities 16.2 Bar Chart for Embedmcnt Plate lssut Rcsolul ion w E E K 8 E G I N N I N c H 0 N [l A y 2/9/87 i/16/87 2/2)/87

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)/16/87

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)/)0/87 4/6/87 I

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At tachmcnl (Conl inucd)

Dresden 26.) Bar Chart for EmLedment Plate Issue Resolution Quad Cities l&.2 Bar Chart for EmLedment Plate Iss11t Rtsolution

~

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w E E K B E G I N N I N G 11 0 N D A y ACT! V !TY

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)/)0/87 4/b/87 4/1)/87 41'()/~;

S&l.tctco performs a walk-down I

for those h.Jngc rs " ich may o-----

CONTlo.JUING 1n1t t*nt i a 11 y a ff.ct piping COIJTI I.JUI 1.Jfi system '1na l'.'s b and de terr.line at t achmcnl loc<ll ion rl* lat i ve i

,,, t:dt",L'S of cmli. p l.:it (.* and I

5 L r.lp.

If nt:Cl:SS.J ry. CE Co j

1wrCorms UT r vr strap I

local ion.

I SH ll( l l i Zt" 5 w.1 I kdown data to pl'rrorm, surl of th1* Sl' hanRers I

lo it.lc*nt i Cy c tinsc han~crs "'hi ch s I i I I may JlOl l'lll I ** 11 y affect pi'""'"

5\\'Sl cm ;rn.:1 l vs i s.

I I.

Sl>I./CECo pcrf orm wa l kdown

(

I a

for those hangers which may potenti*lly cause cmLedr."lent r I ate rSAR al low*

I ables to be excced~d.

Assess these h.:in.~ers Lased on

\\Jalkdown data and issue repairs as necessary.

I.

I I

I I I I

I i

_____ J

i\\:-.:cript ion l nr,'.*' c\\)!'e 110..,:*c,.,, coll c*c t.c.l !'or t'ollow-up 1*:ork P.Ptul 1. oi' !'ir::.;t.so1*t u:;int: e;cneric 2~" x 21 11 nttncl:;:~e1~t

~;i::L' nllo*:rnbl.-~ Jimits (nw11her ct' J~;jn~~er.-.;

rt?f!uirin'.~ 1'0]10*,\\*-up v:ork)

P**~.;11Jt~~ 01* !;1""C1.."nd s('irt u::;ing,jenc:-ric ];_1rc0r l:tt~clJ>:*nt

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(r.u;:-!:1£-r oi' l!nr:i;er:.:

r~:.. pdrinr: f'ollm*:-up wor~:)

Fer-~1lt.:>r' *;:aJ;.:jv*:.11 m::J C'Vn)1w1 ion for hon1~0ri:;

  • i ti
    lord:; > ~Jlv*::~1blc upp0r l irni ts (numh~r oi' J*.cn.o;;*~*rs re*'.U i r ~ 1.,~: i'ol lo*.-1-up *:;ork)

Pf.use= i -

'.Ii ::1101 dn ta ubt n i nc:*i !'rom f'J oor Resul1. of *::r1l!:do*:.11 arid evalu:.it. ion L'or hunsP.rs \\'.'I th loa-J ) allo*::r.ble FSfJ' llmi t:.; (rnu11l>er ot' h:mce:r:;

rc*iu i l'inG foll o*::-up *::orf:)

Ph:.L?C

'.IL:uf.11 clotu oht:.i i111-d from floor Phnsr, ii - Utll i e<i111: UT doto for strop location Totol In Unit

  1. 2 2230 1060 1,1,0 2JO
l'.i5 202 A Status Swmnary Dresden APPROXIMATE NUMBER OF LARGE BORE PIPE HANGERS ON EMBEJl.AENT PLATES In Unit Safety Nonsof cty Reactor Turbine Loads;>

Loads)

  1. J Related Related Bldg.

Bldg.

Upper FSAR Limit 1170 750 1480 1460 770 210 170 270 J80 60 250 190 153 111 244 288 67 181*

174**

Thr: t"bk obovr, dr,scribcc: til0 results of lorf{c bore hanger dravdng collection, plotting and sorting.

Numerical values represent number of hangers and are approximate numbers.

'31~ ~"f1*tl.v-1*"11 *.>ttcdl'

)) (J)~ llllon:;nfl'etty-re:llattedd a

J,,,,, c*

.~-r",, er,

  • 1 ono.o c y-re o e

r-------------

1 DESCRIPTION Ldrge bore hangers cvllecced for f (Excludes bO hangers on diffcrcnl Result of first sort using generic

.:itt~chment si:e allo1Jable limits (

hangers requiring fo:low-11p work)

Results of second so~t using gener attachment size allowable limits w (number of hangers requiring folio Result of walkdown and evaluation with loads > ~llow.:ible upper limit hangers requiring foilow-up work)

- Phase i - Visual d2ta obtained f

- Phase ii -

Utilizi~g UT data for Result of walkdown and evaluation load >allowable FSAR limits (numb requiring follow-up ~ork)

- Phase i

- Visual d~ta obtained f

- Phase ii - Utilizi"g UT data for al low-up work st r.:ip plate) 2~" x 2~11 number of ic larger here applicable w-up work) for hangers s (number of rom floor strap location for hangers with er of hangers rom floor strap location Total In Unit IL 2000 1000 220 l26 B Status Summary Quad Cities APPROXIMATE NUMBER OF l.ARr.F. RORE PIPF. HA!lr.F.RS ON F.HR>;nHF.NT Pl.ATES In Unit Safety llonsafety Reactor Turbine Loads>

Loads) 112 Related Re lated Bldg.

Bldg.

Upper FSAR

-Limit 1000 400 1600 1380 620 94 74 146 110 110 105

  • ll5 **

The table above describes the results of large bore ~anger drawing collection, plotting and sorting.*. Numerical values represent number of hangers ~nd are arproximate numbers.

  • 29 Safety-related, 76 Nonsafcty-related
    • 45 Safety-related, 70 Nonsafety-related

Attachment #JA 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

ATTACHMENT 4A l'l1a::e 1 Walkdown and Evaluation Status Swrunery - Dresden

.*,*:d:i:i'.*'

c,,1?1p:ir<.' lL'oJ,; \\':ilh upper limH. nnil 1:::11B nllownbles for the speclflc ettecbnent location to detennine whether these limits ere satisifed.

4/9/R?

I./; ':/S7

~/?J/37 i;17 122 i.,7 107

] 2i:.

l.',l N ll M f1 E R 0 F U P P E R L J M I T H A N G E R S (UL)

APPROXIMATE NUMBER OF FSAR HANGERS I s 0 11 T 0 T--F.Vi\\i.-tl. ------*****-*--**

So1.lsfii!S Sut sf es I Lippe: Limit.

r:~Al1 (Subset.

01'8 J?.

7

!,6 18

(.]

69 53 76 85 62 6

?.I 38 50 56

))

29 49 54 71 79 Being Evaluated l~CY-@

I 25 4

8 15 l?.

7 Walked Down JO 64 87 91 l 05 126 Evaluated J

50 81 llO 93 108 Sort of Evaluated Hangers Satisfies FSAR UT Requeste Because D~N~Sat~~ FSAR QV=~ - ~

J JJ 57 47 56 64 0

17 24 33 J7 44 Being Evaluated

@=-@

27 14 6

11 12 18

1\\ttachment =38

~umber 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 400 400 800 Turbine Building 180 190 370 To1:al 580 590 1,170

AITACHMENT 48 Pl!a::c I Wu)kdown und Evoluotion Status Swmnury - Quad Cities ik'***:

!:.v:il:i:itc*

1.\\1mp:irc* lo:i,ls 1*1ltl1 upp<*r limil nnd FSJ\\H nllownblcs for the specific attachment location to detennine whether these limits are satisfied,

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'I' E N ti *t n E B

,, F ll p p E R L I M I T HANGERS (UL)

APPROX I M A T E NUMBER 0 F FSA R H A ti GE R S r~u:ml 111. i \\'('

'.',':1]-\\t*.l Evu*1u:1*t1*.I

0 fl. T 0 F E V A ]. II J\\ T E D II A M G E R S

,'t:dci.: :-i.::

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UT lle']uestcd Because Reing Walked Evaluated Sort of Evaluated Hangers Being 01 ilpp.-:r J.inli t l**~;:'dl (Suhc:o'1 fll)('.S Not Satisfy Evaluated Down Satisfies FSAR UT Requested Because Evaluated of' J)

II].

FSAll Does Not Satisfy FSAR 0

0 G) 0 00-0 @{D-0 G=0© CV

@=-@

=©-0

( r:ut.::.:*t or

@)

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3 15 15 15 20 11 9

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U.T.

Cummulative Requested Status As Of CD 4/9/R7 38

./ ;.:/""?

    • 1 I.

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'* 11 Pha~e ii Walkdown and Evaluation Status SWMlary - Dresden This table represents the status of those hangers for which U.T. data was requested.

Thes< hangers fall into the categories shown below.

APPROXIMATE N\\JtIBER OF UPPER LIMIT HANGERS (UL}

APPROXIMATE NUMBER OF FSAR HANGERS Sort of Evaluated Hanger a U.T.

Being U.T.

U.T.

Sort of Evaluated Hangers Received Evaluated Upper Limit FSAR Limit Evaluated Requested Received Evaluated

m.

Does Not Does Not Does Not Satisfies Satisfy Satisfies Satisfy Satisfies FSAR Satisfy FSAR UL UL FSAR PSAR Q) t>>- Q)- @)

Q)-Q)- @*@-Q) 34 7*

7 0

7 0

27 49 23 10 10 0

3(.

15 l '*

_)

l 1, 1

24 58 26 12 12 0

-~n

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JS t7 4J J8

)8 0

I J

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r~r,

0 E.. 1h l*.oe.t J*l.L. morl111ca*1on., were issued on 4/11/87 and *4/J.7/137.

Being Evaluated 13 14 25

U.T.

Cummulative Requested Status As Of CD l/~ c /S7 L 2*~ :*'"

Attachment SB Phase ii Walkdown and Evaluation Status SUJTUllary-Quad Cities This taole represents the status of those hangers for which U.T. data was requested.

Thes~ hangers fall into the categories shown below.

APPROXIMATE NUMBER OF UPPER LIMIT HANGERS (UL}

APPROXIMATE NUMBER OF FSAR HANGERS Sort of Evaluated Hangers U.T.

Being U.T.

U.T.

Sort of Evaluated Bangers Received Evaluated

!!.valuated*

Requested Received Evaluate~

Upper Limit FSAR Limit UL Does Not Does Not Does Not Satisfies sausfy Satisfies Satisfy Satisfies FSAR Satisfy FSAR UL FSAR PSAR Q) rD-G:>-

kV-a>-@ -@-Q)

]7 0

n 0

0 0

)7 12 5

0 0

0

-n 1

)

0 J

0 17

(\\

l*

0 0

n Being Evaluated

[0-*@-@

5

Appendix A 24" Strap Anchor Spacing Some ultrasonic test results have shown strap anchor spacings of 24" (+/- l) on center.

The shop drawings for these embedment plates show a spacing of 18".

It was suspected that the spacing of 24" may have resulted from either a detaiter-fabricator interface not recorded on the shop detail drawing or from a misinterpretation of the detail drawing.

Further review of the data available leads one to believe that the 24" spacing resulted from a misinterpretation of the shop detail drawing.

The following is the basis of our belief.

At present a total of 12 plates have been found to have strap anchor spacings of 24".

These plates form a ~ortion of the plates detailed on shop detail drawing number 4.

This drawing details all ceiling embedment plates at elevation 517'-6" in the Dresden Unit 2 Reactor Building.

This is the lowest slab elevation in the plant riomplex that has ceiling embedment plates.

Hence we believe that this was the first slab with ceiling embedments which was constructed at the plant.

A portion of shop detail drawing number 4 is included as Figure Al.

As shown, the detailing method was to present a generic plan of embedment plate with strap location indicated by the string of dimensions X, Y spaces @ 9", x.

The details of individual plates are specified by assigning each plate a piece mark designation and tabulating the data for that plate.

Figure Al shows this plan and a portion of the table..

Thus per this table, 66 plates with PC MK "A" were to be fabricated; each with a plate length of 10'-0" 13 strap anchors per plate

- the dimension string intended to read 6",

12 spaces @ 9", 6 11 All of the plates presently found to have 24" spacing are Piece Mark A plates.

We believe that these were some of the first plates fabricated.

Lacking any further data, we also believe that some of these plates were fabricated with the dimension string incorrectly interpreted to mean 6", 9 spaces

@ 12", 6 11

  • Such a string of dimension will of course-yield a 24" spacing of anchors along each longitudinal edge of plate.

If such reas9ning were the complete explanation, one would tend to believe that all plates with piece mark A have 24" spacing.

This however is not true.

Ultrasonic test results show that 10 other piece mark A plates at this elevation have anchors spaced at 18" (+/-1).

A possible explanation of this fact is as follows:

Shop detail drawing number 4 was voided on January 12, 1967, and a completely new drawing number 4 was prepared.

A portion of this new drawing number 4 is shown as Figure A2.

The presentation scheme is essentially the same.

In this case, however, the string dimension now reads l~", 13 spaces @ 9",

l~.

This new drawing has a note which reads.

"Strap anchor changes to be effective only for added plates and not affecting plates already on job site per previously approved shop drawing" Based on this we believe the following:

1.

The 6" end distance was changed to l~".

2.

Strap anchor spacing of 26" has not been found.

This would have been the case had the incorrect interpretation of the dimension string continued, i.e., "13 sp~ces" would have been misinterpreted to be 13" dimension.

Thus, at present we believe that a limited number of piece mark A plates were fabricated with 24" spacing.

We also believe that the error was limited to only Piece Mark A of sheet 4, elevation 517'-6", Reactor Building, Dresden Unit 2.

The UT results indicate that the 24" spacing at present occurs to a very limited extent.

We are continuing the analytical work to confirm that the 24" spacing has minimal generic impact.

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