ML20215K244

Assessment of Embedment Plates Status as of 870430, Weekly Status Rept

ML20215K244
Person / Time
Site:	Dresden, Quad Cities, 05000000
Issue date:	04/30/1987
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20215J840	List: ML20215J835 ML20215K244
References
NUDOCS 8705110127
Download: ML20215K244 (18)

Text

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Weekly Status Report Assessment of Embedment Plates Status as of' April 30, 1987 Commonwealth. Edison Company Dresden Station - Units 2 and 3 Quad Cities Station - Units 1 and 2 April 30, 1987 I-8705110127 87d43b PDR R ADOCK 05000237 pyg l

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I.

Introduction:

Th'is is the eighth of a serios 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 r,eport is'to update.the Nuclear-Regulatory Commission,--Region III regarding-the 3tatus:

for this effort. This eighth weekly report consists of a summary of work performed during last week.

II. Dresden Station ,]

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

The previous Weekly Status Reports had-indicated that-some ultrasonic test results have shown strap anchor spacings of 24" (! 1") 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. .The previous weekly report mentioned that based on available data, we believe i

that the 24" spacing resulted from a misinterpretation of the detail drawing and that this occurred on a limited

} number of plates. Appendix A of this report described the basis for this assertion.

1 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 5A 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 4

4 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 1 - Walkdown and Evaluation Status Summary 4A Dresden 4B Quad Cities

5. Phase 11 - Walkdown and Evaluation Status Summary 5A Dresden SB Quad Cities

6. Appendix A - 24 inch Anchor Spacing Note: Attachments 1, 2, 3 and Appendix A have not changed.

Attachment 4A, 4B, 5A and SB have been revised to show current cumulative status.

.. - . . + a - .

N Fats <hmect t . Pa8e l ' 8 f 2 Dresden 263 Bar Chart for Embedment Plate Issee Resolutten c-3 E

• I a.._.----a Quad Cities 162 Bar Chart for Embedment Plate issue Reseletica D#EStens 4WAO cst 8SS Id E E E SECINN INC MONDAY ACTIVITY 2/9/87 2/16/87 2/23/87 3/2/87 3/9/87 3/16/87 1/23/87 3/30/8f 4/6/87 4/11/87 4/20/97

- Ceco requests 56L's assastance 4/27/87 -

l for one f ailed emb. plate at Dresden Unit 2 f2/II/87)

~

- $6L assesses f aaled plate and i

&aforma Ceco that the strap spacing en emb. plate shop dvs. as different from S&L's desage dwg.

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- Ceco requests a teenew of ad- g dit annat shop dwgs. , a mockup plate ECW for UT calibratten and determinattom of plate capac ity per shop dwg. detai!..

Repair of failed plate is issued.

- 56L obtaans prints of large bore hanger dwas. wath attach- r-----------

ment to emb. plate.

- $6L prepares hanger location u -

dwgs. 5

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w-- _ . ~ . * * * * """.".e

- $&L sorts and plots hanger ,

attachments idrafting). In ----- ----- -,

addat son, $6L locates seems of """""~" " " * " * * * " "

• emb. plates using piece marks on shop dwgs.

- 5&L generates emb. plate capacity. u

- S&L performs se engineering assessment and adentifies those r -- --

-7 hangers which meet the shop dwg. * * ~ ~ ~ ~ ** * *

• plate capacity and hence are of no concern.

~ $6L perf orms a sort of remainlag I hangers inte those which may P "*

potentially affect papang system  %."..".". . . J f action and those for which the embedment plate FSAR allowables are exceeded. ,

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St t-* Summary Quad Citim

• APPROIIMATE NUMBER OF LARGE ROBE PIPE naur: Ins nu rwarnuggT PIATe9 DESCRIPT10m Total In Unte la Unit Sa fety possafety teactor

1. 1 #2 Turbine Leads) Loads)

Related Re lated 51d3 Eldg. Uppe r

. r$An Limit Large bore hangers collected for follow up work .

(tactudes 60 hangers om different strap plate) 2000 1000 1000 400 1600 1380 620 - -

Result of first sort using generic 2\" a 24" strachment size allowable limits (number of - - - -

hangers requiring fe'. low up work) - - = _ ,

Results of second sort using generic larger attachment size allowable limits where applicable 220 126 94 (number of hangers requiring follow up work) 74 146 110  !!O 105

• 115**

Result of walkdown and evaluertos for hangers with loads > illowalle upper limits (number of hangers requiring follow-up work!

- Phase i - Visual data obtained f rom floor I

- Phase ti - Utiliair.g UT data for strap tocation

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tesult of walkdown and evaluation for hangers with E lead > allowable FSAF limits (number of haagers requiring follow up uork)

- Phase 4 - Vianal d4ta obtained from floor

- Phase 14 - Utiliair:g 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 approximate numbers.

• 29 Safety-related. 76 Nonsafety-related

• • 45 Sa fet y-re lat ed. 70 Nonsafety-related 9

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 apprgximate.

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

4 L____.

4 Attachment =3B Number of Embedded Plates Quad Cities 4

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

4 1

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

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l I I l _. A PPe ,7TNATF 4UMREE OF U P P E R L I nf I T H A N C E R S ("1)

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( Ph m 11 Walk ^own and W luation St<tu7 Swarearv - Dresden f

This table represents the status of those hangers fer which U.T. data was requested. These hangers fall into the categories shown below.

AMR0ZDLATE EMBER OF EFFER LIluT RAJCERS (UL) AFFROIDEATE NLHRER OF FSAR RANCERS Sort of Evaluated Bangers U T* U I- Belag U.T. U.T. Sort of Evaluated Rangers Being att Requested Received Evaluated r Limit FSAR Limit Evaluated Reque sted Eeceived Evaluated Evaluated tL Does not Does not Does Not Satisfies Sa les Satisfies FSAR Satisfy FSAR g,g $,gg,gy i

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%u.,Joens plate moiltf tcat ions -ere issued on 4/11/87 and 4/17/87.

Attachment 58 Phar,11 Walkdown and Dr,1ra:: ton St"tus SamarY - Quad Cities This table represents the status of those hangers for which U.T. data was requested. These tangers fall into the categories shown t,elow.

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MFRCmATE NE OF FSAR EMCUS AFFRCIDIATE 566 GF EFFER LDf17 3MCERS (tL]

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Appendix A 24" Strap Anchor Spacing l l

Some ultrasonic test results have shown strap anchor spacings of 24" (1 1") 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 detailer-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 portion 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 complex 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 A1. 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".

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

4 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" (11"). A possible explanation of this fact is as follows:

Shop detail drawing number 4 was voided on January 12, 1967, j

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,,some. In this case, however, the

• string dimension now reads 1 ", 13 spaces @ 9", 1 ". 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 1 ".

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.

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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