ML20214S308

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Weekly Status Rept,Assessment of Embedment Plates Status as of 870528
ML20214S308
Person / Time
Site: Dresden, Quad Cities, 05000000
Issue date: 05/28/1987
From:
COMMONWEALTH EDISON CO.
To:
Shared Package
ML20214S289 List:
References
NUDOCS 8706090223
Download: ML20214S308 (17)
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Text

v Weekly Status Report Assessment of Embedment Plates Status as of May 28, 1987 Commonwealth Edison Company Dresden Station - Units 2 and 3 Quad Cities Station - Units 1 and 2 May 28, 1987 8706090223 B70529 PDR ADOCK 05000237 R PDR I. Introduction This is the eleventh of a series of 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 eleventh 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. Except for following up on a small number of hangers, the walkdown is essentially complete. We expect to complete the field walkdown activity by June 5, 1987.

The current cumulative walkdown status is indicated in Attachment 4A. Attachment SA shows the cumulative status of ultrasonic testing data and resulting embedmont plate assessment.

Due to high radiation in certain areas of the plant, 27 hangers are presently inaccessible. Walkdowns for these hangers will be performed when conditions permit.

III. Quad Cities Station Per the Milestone Bar Chart (Attachment 1), the walkdown at Quad Cities is continuing. Except for following up on a small number of hangers, the walkdown is essentially complete. We expect to complete the field walkdown activity by June 5, 1987.

The current cumulative walkdown status is indicated in Attachment 4B. Attachment SB shows the cumulative status of ultrasonic testing data and resulting embedment plate assessemnt.

Due to high radiation in areas of the plant, 20 hangers are presently inaccessible. Walkdowns for these hangers will be performed when conditions permit.

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
5. Phase 11 - Walkdown and Evaluation Status Summary SA Dresden SB Quad Cities
6. Appendix A - 24 inch Anchor Spacing Note: Attachments 1, 2A, 2B, 3A, 3B and Appendix A have not changed. Attachments 4A, 4B, 5A and 5B have been revised to show current cumulative status.

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  • 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 Raactor Building 360 470 830 Turbine Building 90 100 190 J

Total 450 570 1020 O

Attachment m3B 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 400 400 800 Turbine Building 180 190 370 To t'a l 580 590 1,170

_ _ _ _ _ _ . _ _ . _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ . _ _ . _ _ _ _ _ _ _ _ _ . . _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _._.____________.___________________.__________.___.______m

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l ITV *ENT G Ftere i talrdxr. sr.1 Yvslut!cn r+ =':s Nnmarf - Msie-l

! Ete: Ev= hate = Orpre loads eith upper 1! sit nr.d E.AR alicuotles fer the spee!ffe attachner.t locat!an to deterrafre wl. ether these I!m!ts are satis! fed.

4 APPP 0 7 I 'l A ? ? t; U M P E 7e CF 'J P P E R 1 I M I T !! A N C E R S ( ".) J ~4.PPRCXIMATE NUMBEh 0F FSAR HANGERS ~~ ~~ ' - ' ~

Cu:ralat!ve Sa!ked Evelanted F0P7 OP F V A L fi A T F 3 H A N G E P. S ,

N!rg Ca+!sf'es N !r.g Walke-1 Evahnted Sort nf' Fvshatei Herrers ftems es 'rwr. Ea t . . ';e s I m aateJ Nenase Latisfies r.lh  ;'T Lewer e i re-c e .c e Evaluste$

e of pp+r limit F"O LNbset 'bes Not Settsfy h olante$ Dcwn "h* h b *C h 9 h)-b h h -

ordi 1 : i 3 3 0 27 12 7 6 11 25 30 j l 3/16/67 43 14

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$c p 49 3 g, 81 57 2 6 f4/2/37 IT .

9 (1 l 1 38 54 15 91 80 47 33 33 4/9/87 122 i 107 69 53 12 105 93  % 77 12 126 76 55 50 7 4/it/87 '7! ,

I 62 75 7 126 108 64 g 18 ,

4/23/S7 143 141 ?S 56 132 124 77 47 8 4/30/87 91 66 58 83 7 156 149 f '

147 144 88 !6 3 102 74 65 93 12 5/13/87 178 ,

167 j I r i 71 104 2 134 13y gg g5 3 5/21 /27 160 173 1 107 74

  • i 5/28/87 ISO 179 107 74 72 105 1 154 154 g9 65 0 l

l Su=r. arf as of 5/24 87 Item Approximate Number of Bangers Walked Down (Colum. h+ N Column @)

Presently inaccessible (Section !!) U Physically removed 67 (See Ate 1) Mte 1: Inclaies lar.gers physically removed ty design ir.ter.t or re ?&w . e:d rernatered ecunted as distinet bargers tetain to be walked don 0 (cor.f!r.stery docuivr.t raview is in progress)

Iwt al of a'aose lines = otal in 428

-41Moa scope (Attacament Ja,

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AMAMSL"f 49 Ptare ! Walkdm and Evaluation ftatus Sterary - Cun' Citice l Note: Evaluste

  • Cmpere loais sitt. u;per limit and ?!AR a11custles fcr the spee!fic attactrent locat!m to detemine whether trese limits are satisfied, i

APPROIIMATE NUMBER OF UPPER LIMIT H A N G E E S (U1) APPROXIMATE NUM5ER 0F FSAR HANGERS f

Carmlative Es1r*$ Evelanted POk7 0F EVA1UATED MAMG'RS Ctstw as Dcarn Oatizfies satirries 61 heqw st+1 M aue feir.g Enlked Evalasted Fm cf FvCuee9 Anwrn re tng of Up rlinit Fr.AR (Subset Ws 'M Fat *erv Evalaata3 Down ratisfies FSA.R LI Requested W ause Ivalcetei cf 3) UL FEAR Does Mot Satisfy SEAR l O O O O GGG (Cu % t of GOO GOO O G O ese Gee O

4A/97 23 0 0 3 3 3 23  % 0 C 3 16 4/9/87 33 18 3 3 15 15 15 20 1: 9 2 9 4/16/?? 41 36 15 12 21 24 5 27 23 14 9 4 4'23 ? 12 4' 23 h 2*  ?? 4 27 23 18 5 4 4/M/87 56 53 22 16 31 37 3 37 f5 19 6 12 5/13/87 61 59 23 16 36 43 2 37 32 9

  • 23 5/21/97 63 t2 24 16 38 e.6 1 39 37 23 14 2 sad /87 66 68 27 19 41 49 0 42 40 26 14 2 l Su: mary as cf 5/29/f7 Item Approximate Number of Bangers Walked down (Colimme h + Column h ) 110 Presently inaccessible (Section 111) 20 l Physically removed 16 Note 1: Inclaies 1.argers prysically remove $ ty design intent or (See Ncte 1) redrawn and nrrmbend counted as distiret hargers O

" W Renata to be walked down l

Total of above lines = Total la validown scope (Attachment 24) 1

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This table represents the status of those hangers for which U.T. data was requested. These hangers fall into the categories shewn helow.

t AFFRCI:3A!! 5l"M3Z1 C, UFFE1 LIMIT ELEERS CT.] # U sort of Evaluated Sangers C.T. U.T. Being U.T. U.T. Sort of Evalu.ted E.ngers Setag rg = - " " " a-="

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Appendix A 24" Strap Anchor Spacing Some ultrasonic test results have shown strap anchor spacings of 'z4" (t 1") on center. The shop drawings for these embedmont plates show a spacing of 18". It was suspected that the spacing of 24" may have resulted from either a detailer-fabricator l

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 l the shop detail drawing. The following is the basis of our belief.

( At present a total of 12 plates have been found to nave strap l anchor spacings of 24". These plates form a portion of the plates detailed on shop detail drawing number 4. This drawing details all ceiling embedmont plates at elevation 517'-6" l

l in the Dresden Unit 2 Reactor Building. This is the lowest I slab elevation in the plant complex that has ceiling embedmont plates. llence we believe that this was the first slab with ceiling embedmonts which was constructed at the plant. A portion of shop detail drawing number 4 is included as Figure A1. As shown, the detailing method was to present a generic plan of embedmont plate with strap location indicated by the string of dimensions X, Y spaces @ 9", :" . The details of individual plates are specified by assigning each plate a picco mark designation and tabulating the data for thatThus plate.

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

l por this table, 66 plates with PC MK "A" were to be fabricated; l

each with

- a plate length of 10'-0"

- 13 strap anchors per plate

- the dimension string intended to read 6",

l 1

12 spaces @ 9", 6".

All of the plates presently found to have 24" spacing are Picco 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 0 12", 6". Such a string of dimension will of course yield a 24" spacing of anchors along each longitudinal edge of plate.

( - --- - - - _ _ _ _ _ ___ _ _ _ - - - _ _ _ _ ___

If such reasoning 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 an 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 roads 1 ", 13 spaces @ 9", 1 " . This new drawing has a note which roads.

" 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" and distance was changed to lh".
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 spaces" 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.

g The UT results indicate that the 24" spacing at present occurs s 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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