ML17199T443

Forwards 870416 Status Rept Describing Progress in Resolving Questions About Installed Configuration of Embedment Plates, Per

ML17199T443
Person / Time
Site:	Dresden, Quad Cities, 05000000
Issue date:	04/16/1987
From:	Johnson I COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
2855K, NUDOCS 8712010001
Download: ML17199T443 (15)

Text

91 Common.Ith Edison One 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 16, 1987 subject:

Ores.den Station Units_ 2 & 3 Quad Cities Station Units l & 2 "Embedment Plate Status Report"

(~-t I 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 16, 1987 describing our progress in resolving questions.about the installed configuration of embedment plates at Dresden Units 2 and 3 and Quad Cities Units l and 2.

/klj att.

cc:

M. Grotenhuis-NRR T. Ross-NRR M. Ring-RIII

• . Yours very truly,

.~).L~.,~

I. M. Joh so Nuclear Licensing Administrator 2855K 8712010001 ez~~37 PDR ADOCI'. O~DR R

. _,... K.... *

~LJ APR i rz 19811EO I

~..

Weekly Status-Report Assessment of Embedment Plates Status as of April 16, 1987 Commonwealth Edison Company Dresden Station. - Units 2 and 3 Quad Cities Station -

Units 1 and 2 April 16, 1987

I.

Introdtiction This is the si~th of a series of weekly r~ports 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 sixth 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 Diesden is continuing..

-The previous Weekly Status Report had indicated that some ultrasonic test results have shown strap anch.or 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 dra~ing or a misinterpretation of *the detail drawing.

We are continuing our effprts to understand what may have happened.

• • e*

Attachments 4A and SA show the current cumulative status.*

of work progress.. Effects of 2 4 '.' spacing of strap

• anchor has not yet been. incorporated into the nim~ber~.***..

presented in attachments.

III.

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

The current cumulative status is indicated in Attachment 4B.*

A number of ultrasoriic test res~lt~ have been received

.for evaluation.

These test results indicate a strap anchor spacing of 18" on center~ Attachment SB shows the present status of ultrasonid testing data~

IV.

Attachments The following attachments are included in this weekly report.

1.

Miles.tone Bar Chart -

Dresden and Quad Ci ties

2.

Summary of Status -

2A Dresden 2B Quad Cities

3.

Number of Ernbedment Plates -

3A Dresden 3B Quad Cities

4.

Phase i -

Walkdown and Evaluation Status Suriuna.r.:y

• 4A Dresden 4B Quad* Cities S.

Phase ii -

Walkdown and Evaluation Status Summary SA Dresden SB Quad Cities Note:

Attachments 1, 2 and 3 have not changed.

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

Attachment SB bas been added.

• • • (

.'<\\.

~

ACTIVITY

- CECo requests 56.L' s assistance for one fal led cmb. plate at Dresden Unit 2 (2/11/87)

S6.L assesse1 failed plate and in(orms CE Co that the strap spacing on emb. plate shop

.dwg. is different from*56oL'a design dwg.

CECo request* a review of ad-ditional shop.dwg1.

• a mockup plate ECN for UT calibration*

and determination of plate.

capac.ity per ahop dwg. detail.

Rep~ Ir of fa I led plate.la issued.

S6.L obtains prints of large bore hanger dwgs. with at tad,..

~ent to emb~ plate.

56.l prepares hanger location*

dwgs.

56.L sorts and plots hanger,

.at tachmenta (drafting>.

In add it ion, su locates ae8ma of emb. plateo using piece marks on ahop dwgo.

56.L generates emb. plate capac lly.

56.L perfor1H an engineering assessment and identifies those hangers which meet th* shop dwg.

plate capaclty and hence are of no concern.

56.L pe rf orm1 a sort of re,..lnlna hang era Into thooe whlch may potentially affect piping oyatem func t Ion and those for which the

• embedrnent plate F5AR allowablu are exceeded.

Attachment I Dresden 263 Bai Chart for Embedment Plate lasue Resolution Quad Cities 1~2 Bar Chart for Embedment Plate lsaue Resolution W E E K *s E G I N N I N C H 0 N DA y 2/9/87 2/16/87 2/23/87 3/2/87 I

319181 3116/87 3/23/87 3130187 4/6/87 I

r-

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

~-*...1 I

I -- --.

-~

• --- -_"]

• to Pag~ I of 2 4/13/87 4/20/87 r--"":'-- --*- ~

~-:-------:--'

~lJAD CITl*S 4/27/87 I

e I

I I

I i

' I

ACTIVITY

~l>L/'-L'-0 performs a va1Koown for tho&c hangers which may po1en1 i~l I)' afl*P piping sy!;tcm anal~sis and determine altachmcnt location r~lative to ed~cs of cmb. pla1e and st rap.

If nece.ssary~ CE Co performs UT for strap local ion.

SbL utilizes walkdown data to perform a sort of these hangers to i dC'nt if y those hangers which st i"l l may potcnl ial ly affect pipinr, system analysis.

56.L/CECo perform a walkdown for tho,;e hangers which may potentially cause eml>edr..ent plate FSAR allow-ables to be exceeded.

As!l>ess these hangers based on walkdqwn data and issue repair a as necessary.

<.'9/87 2/16/87 2/2)/87 I

~

i I

I I I

Attachment l (Continued)

Dresden 26.3 hr Chart for. Embedment Plate Issue Resolution Quad Cities 16.2 Bar Chart for Embedment Plat* Issue Resolution W E E K B E C I.ff. N I N C H 0 N D A Y 3/2/87

)/9/87

)/16/87 3/23/87 3/30/87 4/6/87 o--

CONTl.,UIH6 Page 2 of L. -

c::::J DRESDEIJ r- -

-, QUAD (!Tl.ES 4/13/87

. 4/20/87 4/27/87 COIJT l WUI W~

I (r.-

• - A Status SWmnsry Dresden APPROXIMATE NUMBER OF URGE BORE PIPE HANGERS <JI~.

PLATES Total In Unit In Unit Safety Nonsafety 8eee't.ar Turbine Loads>

LOads >

• Description

1. 2

1. J Related Related Bldg.

Bldg.

. Upper FSAR Limit Large bore hangers collected for follow-up 'tft)rk 22JO 1060 ll70 750 1480 U60 770 Result of first sort us:lllg generic 2t" x 2!"

440 2JO 210' 170 270

)Ill 60 250 190 ettechnent size allowable limits (lllllllber of hangers requir:lllg follow-up work)

Results of second sort ueblg generic larger J55 202 153

'111 244 288 67 181*

174-attachment size allowable l:lmits where applicable (11111Dber of hangers requir:lllg follow-up work)

Result of walkdown and evaluation for h!ingers with loads )'allowable upper limits (number of hangers requir:lllg foilow-up work)

- Phase i - ViiJual data obtained from noor

-.Phase ii -- Utiliz:lllg UT data for strap location Result of walkdown and evaluation for hangers with load ) allowable FSAR l:lmits (lllllllber of heDgers requir:lllg follow-up work)

- Phase 1 - Visual data obtained from noor

- Ph,ase 11 - Utilizing tJT data for strap location Tbe table above describes the resuits of large bore 'hanger drawing collection, plott:lllg and sort:lllg.

Numerical values represent Daber of bangers and are approxiniate, numbers. '

• 76 SafetY-related, 105 Noneafety-related J5 Safety-related, 139 Nansafety-related

-.*1

Total In Unit DESCRIPTION

1. 1 Large bore bangera collected for follow-up vork I

(Excludes 60 hangera on different at~ap plate) 2000 1000 Reault of firat aort *uaing generic :zit" 11 Zit" attachment aize allowable limit* (number of hangers. requiring foilow*up vork) lleaults of aecond ao=t uaing generic larger attachment aize allowable limit* where applicable 220 126 (number of hangera requiring follow-up vork)

Reault of valkdovn and evaluation for hangers with load* > allowable upper limits (number of hanger* requiring foilow*up vork)

• Phaoe i

• Viaual data obtained fr011 floor

• Phaae ii

• Utilizing UT data for atrap location Re1ult of walkdovn and evaluation for hanger* with load > allowabJe FSAll limit* (number of hanger*

requiring follow-up vork)

• Phaae i

• Viaual data obtained from floor

• Phaee ii

• Utilizing UT. data for atrap. location 8 Statua Summary Quad Cfrlea APPROXIMATE NUMBER ov* LARGI!

In Unit Safety f2' Related 1000 400

. 94 74 BORE PIPR RANt:ER!I lloneafety Related 1600 146 ON l!MJll!nHENT PLAT!!S Reactor Turbine Loads>

Loads)

Bldg.

Bldg.

Upper FSAll

• .-Limit 1380 620

~

110 110 105

• llS**

The table above deacribea the reaulta of large bore banaer drawinR collection, plotting and 1orting. *. lhmerical value.* repreeent n'Cllllber of bangero and are a~proxllilate nUJllbera. *

• 29 Safety-related, 76 Nonaafety*releted

• • 45 Safety-related, 70 Nonaafety*related

. -Ji.*

Attachment #JA Number of Embedded Plates Dresden e*

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** =3B Number of Embedded Plates Quad Cities The following table shows a breakdown of number of embedded plates with large bore pipe hang~rs ~ttached to them~

The

• numbers indicated are approximate.

Bldg - Unit Unit #1 Unit #2 Total Reactor Building 400 400 800 Turbine Building 180 190 370 Tot:al 580 590 1,170

ATIAQlMENT 4/1.

Phase i Walkdown and Evaluation Status Smlllery - Dresden Note: Evaluate = Compere loads with upper.limit end FSAR allowables for the specific attachDent location to determine whether these limits are satisifed.

APPROXIMATE NUMBER 0 F UPPERLIYIT H A N G E R S {UL)

APPROXIMATE NUMBER 0 F FSAR RA.NGERS Cumulative.

lalked Evaluated*

• S 0 RT 0 F EVALUATED HANGERS Status as Down

. Satieties

,&1'1sr1es UT Hequestea l

lecause Being Walked Evaluated Sort of Evaluated Hangers Being

• or Upper Limit FSAR (9.1.bset Does Not Satisfy

.*.Evaluated Down Satisfies FSAR UT Requeste~ Because Evaluated 0

Q) or~

UL ri:ll\\lt Do NG> Sat~ FSAR

@~-

cg:iifO> @-@-©

<}-(1)-@.

11~9-10.

J/1S/E't7 4J lS 12 7*

6 11 25 I

JO J

J 0

27 J/26/En 71 67 46 JS 21 29 I

4 64 50 JJ 17

. 14

• 4/2/En 107 99 61 50 JS 49 I s I 87 81 57 24 6

4/9(87 122 107 69 53 38 54 15 n

80 47 33 11 4/16/En

!JS 126 76 55 50 71 12 105

.. 9J 56 "J7 12 e

ATTACHMENT 4B Phase i Wal.kdown and Evaluation Status Sumnary -*Quad Cities Note:. Evaluate " C<Jnpare loads with upper limit and FSAR allowables for the specific attachment location to determine whether tbese li11its.are satisfied.

APPROXIMATE *.HUMBER 0 F UPPER LI YI T H A N G E R S (UL)

APPROXIMATI IUMBER 0 F F S A*R BANGERS

~stive Wel.ked Evaluated S 0 RT 0 F EVALUATED HANGERS Status as DOwn Satisries Satisfies UT Requested Because Being

.Walked Evaluated Sort of Evaluated Harurers Being of Upper Limit FSAR (Slbset Does Not Satisfy Evaluated Down Satisfies *FSAR UT Requested Because Evaluated of J)

UL FSAR Does Not Satisfy FSAR 0

0

© 0<D-G:: ©0-© G=©-©

© G)

@=-

@-©-0 (Subset of 4/2/fn 20 0

0 0

0 0

. 20

.16 0

0 0

16 4/9/87 33 18 3

3 15 15 15 20 11 9

2 9

4/16/fn 41

)6 15 12 21 24 5

27 2J 14 9

4 e

• ~.

Attachment SA Phase ii Walkdown and Evaluation Status Summary-Dresden This table represents the status of those hangers for which U.T. data was requested.

These hangers fall into the categories shown below.

APPRDDliATE JlllMlrER OP UPPl!R LIKIT iiARcERS CULl APPRllXIKllE RUKBER OP PSAR BANGERS Sort of Evaluated Bangers Q.T.

U.T *.

Being tl.T.

U.T.

Sort of Evaluated Bangera

• Cummulative Requested "Received Evaluated Evaluated Requested Received Evaluated Statua As Of Upper Limit PSAR Limit UL Does.Not Doe* !lot Does Not Satieties Sa6f;afy Satisfies Satisfy Satisfies FSA1l Satisfy FSAR

• UL PSAR l'S"AR

(!)

(j)

V-G)- <!>

(l)-Q)-@ *@-

@*@ ~@

4/9/87 38 34 7

7 Q

J 0

27.

49 23 10 10 0

!t/16/87

50.

J9 15 15 0

14 l*

24

. 58 26 12 12 0

• Embedment plate modification was issued on 4/11/87.

'.l.*

• ..,;'"I.

Being Evaluated

~--@-@

13 14

U.T.

Cummulativa 11.equasced Status Aa Of

(!)

4/16/87 21

~. :

Tflis talile requested.

Attachment SB_

Phaee ii Walkdown-and Evaluation Status Summary~ Quad Cities represents tl'le status of tl'lose hangers for wl'lich U.T. data~

These liangers fall into tlie categories shown below.

~llonMATE tnJMBEll OF UPPER LI!!IT HANGERS (l!Ll

~

lllJllllEll 01' FSAR llARC!JIS Sort of Evaluated Bangers U.T.

Beina

'U.T.

U.T.

Sort of Evaluated Bangers Baceiv~

Evaluated Upper Limit FSA!l Limit Evaluated*

Requested llaceived Evaluaud

'UL Does Not Doea Hot Doe* Hot SathfiH Sattify Satisf1e11 Satisfy Satisfies FSAR Satisfy FSAll UL UL FSAR FSAR Q)

~-G>-@

©*a>-@ KID*@-

~~@-.@

17 0

0 0

0

0.

17 12 5

0 0

0

.. ;. ~

Being Evaluat

~-@@

5