Text

Evaluation of Findings of Basemat Crack Insp May-June 1986
	ML20211N409
Person / Time
Site:	Waterford
Issue date:	06/30/1986
From:	Bari I, Liu P; EBASCO SERVICES, INC.
To:	;
Shared Package
ML20211N390	List: ML20211N409; W3P86-1639, Forwards, Evaluation of Findings of Basemat Crack Insp of May/June 1986. Basemat Design & Performance Still Acceptable During All Postulated Loadings Including SSE Loads;
References
	NUDOCS 8607030091
	Download: ML20211N409 (47)
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i LOUISIANA POWER & LIGHT COMPANY WATERFORD STEAM ELECTRIC STATION UNIT NO. 3 EVALUATION OF FINDINGS OF BASEMAT j

CRACK INSPECTION MAY/ JUNE, 1986 I

Prepared By: I. Bari/P. C. Liu

-l Reviewed By:

A. H. Wern s

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Ebasco Services Incorporated -

2400 Veterans Memorial Blvd i

Suite 200 Kenner, Louisiana 70062 i

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t LOUISIANA POWER & LIGHT COMPANY WATERFORD STEAM ELECTRIC STATION UNIT NO. 3 EVALUATION OF FINDINGS OF 3ASEMAT CRACK INSPECTION OF MAY/ JUNE 1986 Table of Contents Page i

1.0 PURPOSE 1

2.0 SCOPE 1

3.0 CONCLUSION

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4.0 REBASELINING 2

5.0 BACKGROUND

2 6.0 DISCUSSION 3

6.1 Development of Original Crack Maps 3

6.2 Inspection Findings of May/ June 1986 3

6.3 Establishment of Current Baseline 6

6.4 Movement of the Basemat 6

6.5 Groundwater Elevation 6

1 6.6 Basemat Construction Sequence Analysis 7

6.7 Structural Significance of Previously Unmapped Basemat Cracks 8

REFERENCES TABLES TABLE 1 - Basemat Crack Inspection - Areas Not Initially Inspected TABLE 2 - Basemat Crack Inspection - Areas Not Inspected June,1986 TABLE 3 - Groundwater Elevation

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5 LOUISIANA POWER & LIGHT COMPANY ss WATERFORD STEAM ELECTRIC STATION UNIT NO. 3 j

EVALUATION OF FINDINGS OF BASEMAT CRACK INSPECTION OF MAY/ JUNE 1986 i

Table of Contents (cont'd)

APPENDIX A - Letter from Consulting Engineer - Dr. A. V. du Bouchet, dated 6/24/86 APPENDIX B - Guidelines for Mapping Basemat Cracks 1

FIGURES l

FIGURE 1 - Basemat Crack Inspection - Areas Not Initially Inspected

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FIGURE 2 - Basemat Crack Map Outside RCB - Sh.1 FIGURE 3 - Basemat Crack Map Outside RCB - Sh. 2 1

FIGURE 4 - Basemat Crack Inspection - Areas Not Inspected June 1986 FIGURE 5 - Basemat Crack Inspection - Coated Floor Areas FIGURE 6 - Composite Foundation Mat Settlement Sh.1 of 2 FIGURE 7 - Composite Foundation Mat Settlement Sh. 2 of 2 FIGURE 8 - Basemat Absolute bettlements Sh. 1 FIGURE 9 - Basemat Absolute Settlements Sh. 2 FIGURE 10 - Basemat Absolute Settlements Sh. 3 FIGURE 11 - Basemat Absolute Settlements Sh. 4 FIGURE 12 - Basemat Absolute Settlements Sh. 5 FIGURE 13 - Basemat Absolute Settlements Sh. 6 FIGURE 14 - Basemat Absolute Settlements Sh. 7 FIGURE 15 - Basemat - Comparison of Crack Pattern 11

LOUISIANA POWER & LIGHT COMPANY V

WATERFORD STEAM ELECTRIC STATION UNIT NO. 3 EVALUATION OF FINDINGS OF BASEMAT CRACK INSPECTION OF MAY/ JUNE 1986 1.0 PURPOSE Inspection of the accessible areas of the common foundation (basemat) of the Nuclear Plant Island Structure (NPIS) for cracks at least once every 18 months is required by NPF-38 License Condition 17 and implemented by LP&L Surveillance Procedure PE-5-033 (Re fer ence 1).

The first such inspection since Waterford 3 has been in operation was initiated on Friday, May 30, 1986, and completed on Tuesday, June 3,1986. During the inspection several cracks were detected which had not been identified during the original inspection in 1983 and recorded on the baseline crack maps, LPEL Drawings G-C-0003 and G-C-0004 (Refer ence 2).

This report evaluates all previously unmapped cracks to determine their s tructural significance and fulfills the requirements of Sections 8.1.3 to 8.1.5 of the surveillance procedure.

2.0 SCOPE l

O This report describes the development of the original crack maps, results of recent crack monitoring surveillances and inspections, the establishment of revised baseline crack

maps, and evaluation of inspection findings.

The evaluation included reviewing information related to the pr eparation of the original crack maps, inspection of previously unmapped cracks, analyzing recent da ta on basemat settlement and groundwater elevations, and determining the structural significance of the previously unmapped basemat cracks.

3.0 CONCLUSION

S The original crack maps were developed based on visual inspections of "all accessible areas of the basemat" (Pg.

9, Refer ence 3) in August / September, 1983.

The original mapping was intended to establish the severity and pattern of the cracks and included a major portion of l

the basemat. It provided data which enabled determination of the causes i

and significance of the cracks; but did not include some areas which were inaccessible during that time frame and therefore, not inspected.

It is concluded that the previously unmapped cracks in the basemat l

existed during the 1983 inspection but were not mapped due to inaccessibility or because they were extremely fine hairline cracks and hence, either not detected due to the concrete surface conditions at the time of inspection or considered to be superficial.

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(.D similar in age and character to those cracks previously identified and appe ar to be members of the same family.

They are considered to be structurally insignificant and have no detrimental effects on the integrity of the basemat of the NPIS.

4.0 REBASELINING Future basemat inspections will use recently revised and updated baseline crack maps developed from the May 30 - June 3, 1986 inspection and the intensive reinspection performed in mid June, 1986.

These maps note the inaccessible areas and the bases for their being inaccessible.

The resultant accessible baselined area will define the future inspection areas other than instances of temporary inaccessibility.

5.0 BACKGROUND

The inspection of the basemat conducted from May 30 to June 3, 1986 was made in accordance with LP&L Surveillance Procedure PE-5-033 to determine if any cracks either 10 feet or more in length or exceeding 0.015 inches in width were observable beyond those documen ted on the original crack maps.

The inspection detected some previously unmapped cracks which were judged to be longer than 10 feet.

The cracks were represented by wet patches or dried leachate.

No cracks were observed which exceeded the 0.015 inch crack width criterion.

Immediately af ter the first detection of previously unmapped cracks on May 30, 1986, a preliminary evaluation was made.

The results of the preliminary evaluation were reported verbally to the NRC Project Manager and Project Director on June 2,

1986.

The preliminary evaluation determined that these cracks appeared old and insignificant based on the locations and because the cracks were in the same general area as pr eviously mapped cracks, with the same general orientation (running east-west) as previously mapped cracks.

It also appeared these cracks were in areas of the basemat which were inaccessible at the time of the original mapping.

An information copy of a preliminary markup of the crack map was also provided to the NRC staff.

The original crack mapping was made during August 30 to Septenber 2,1983 by Harstead Engineering Associates, Inc.

(HEA) with assistance from Ebasco and LP&L.

The results of the original mapping were included as Appendix A of HEA Report No. 8304-1 (Reference 3).

LPEL drawings showing original cracks also incorporated a few, minor, local crack details based on field ver ifica tion.

Later, during July and August

1984, non-destructive testing (FDT) was performed on selected cracks by Muenow and Associates, Inc. (Reference 4 ).

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E 6.0 DISCUSSION 6.1 Development of Original Crack Maps i

The. main purpose of the original basemat crack mapping in Augus t/ september 1983 was to survey general crack patterns for determination of their causes and significance.

The original mapping

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covered and included most areas of the basemat and provided suf ficient I

data for the stated purpose.

It did not specifically iden tify the j

inaccessible areas which were not mapped.

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6.2 Inspection Findings of May/ June 1986 l

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J Immediately after the first detection - of previously unmapped basemat cracks by LP&L on May 30, 1986, during the first basemat surveillance l

inspection, the applicable areas were inspected by LP&L and Ebasco engineers.

The inspection follow-up, including discussions with the key personnel involved in the original crack mapping, formed the primary I

bases of the preliminary evaluation.

The cracks identified during the surveillance inspection have been shown to be in areas which were inaccessible at the time of the 1983 inspe'etion.

'l As a result of further dis cussions with individuals involved in the actual original mapping, it became evident that there might have been

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additional areas which were inaccessible or-had difficult accessibility, j

and therefore were not inspected in 1983.

It was also observed that it i

was easy to miss a crack due to poor lighting, dirty floors, minute width of cracks, concre te sur face irregularities and conges tion in the area.

Consequently, the key personnel from Haratead Engineering Associates, Inc. and Ebasco who had per formed the original mapping were recalled - to the site to tour presently accessible basemat areas and review their notes, existing files and records. They confirmed that there were areas of the basemat which were inaccessible and not inspected and also i

confirmed that cracks which appeared to be superficial were not. mapped in

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the original inspection. Appendix A contains a letter from Dr. A. V. du Bouchet, the key person from Marstead Engineering Associates, Inc.

involved in the original crack mapping, confirming his recollection of the original inspection.

Ebas co 's key person who assisted Marstead Engineering Associates, Inc.

in August / September,

1983, for crack i

mapping, indicated as shown on Figure 1,' to the best of his recollection (although in several cases the individual -could not recall speci fics ),

j areas which were not originally inspected.

These areas with details of

^j specific reason for not inspecting are listed in Table 1.

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LP&L initiated an effort to reinspect the entire area of the basemat to clearly identify inaccessible areas, coated areas (see Figure 5) and to map crack s for the entire currently accessible basemat areas.

At the instructions of LP&L, Ebasco engineers did this reinspection during the weeks of June 16 th and June 23rd, 1986.

Two separate inspection teams were utilized in the majority of the uncoated basemat areas to provide as accurate a mapping as feas ible.

This inspection was performed in accordance with " Guidelines for Mapping Basemat Cr a ck s ", provided as Appendix B.

The guidelines do not limit identification and documentation of cracks which exceed limits set by LP&L Surveillance Procedure PE-5-0 3 3.

The inspection covered the entire basemat except high radiation areas, crawl areas and areas inaccessible for other reasons.

These areas are shown on Figure 4.

The results of this inspection are summarized as follows:

a.

Incation The, previously unmapped cracks are located in areas as shown by the dashed lines on Figur es 2 and 3.

They are located in close pr oximity to other cra ck s, and in some cases, appear to be an extension of pr eviously mapped cracks.

The previously unmapped cracks shown on these figures consist of the following categories:

i i)

Cracks Wich are 10 feet or longer and are repor table as per LP&L Surveillance Criteria PE-5-033.

ii) Cracks Wi ch are within acceptable limits es tablished in Surveillance criteria but are shown for the purpose of rebaselining the crack maps.

Most of the pr eviously unmapped cracks are in areas which were previously inaccessible as shown on Figure 1.

The remaining cracks are superficial, fine cracks which would not have been documented in the original mapping.

b.

Surface Appearance Surface appearance of most of the previously unmapped cracks varied from a Witish colored line to signi ficant deposits of leachate.

The cracks were filled with leachate similar to those previously identi fied.

Most of the cracked sur faces were completely dry.

Ex ceptions were the Diesel Storage Tank Room B (BS2) and the Sanitary Equipment Room (B51 ) Were, although cracks had leachate deposits, wetness was observed over a significant length of the cracks. In addition, part of the crack in the East vault Area (B56) had some wet spots. The cracks in the area between column lines 12M

& 12A and between R and V, as shown on Figure 3, were all dry and sealed with small amounts of leachate.

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The cracks in the Cooling Tower Area between column lines 7FH and 12M and T and V were also dry with only a whitish line in the por tion of the crack near column line 12M and small leachate deposits further away towards column line 9M.

Some of these cracks which are easily visible could not have been missed during the first inspection ( August / September, 1983 ) unless physically covered during the construction period.

This appears to be reasonable since an original inspection team member recalled that construction was in progress in that area at the time of the inspection and that part of the area was used for s torage of missile grating and other construction material.

The crack between column lines 6FH and 7FH and between T1 and T, which connect two of the originally mapped short cracks, was dry.

Half of this crack is so fine that it can not be detected from a standing position. The other half of the crack was also fine, less than 5 mils in width with no leachate.

This crack may have been missed in the original inspection due to dif ficult detection or considered superficial, and therefore not mapped.

Several cracks in the West Cooling Tower and West Vault Areas were also fine cra ck s, sealed and dry.

Most of these cracks are less than 10 feet in length.

The crack s in the West Cooling Tower Area between column lines lA and 1M and between V and s were all dry and sealed and very O

difficult to detect. In fact, 3 of the 4 previously unmapped cracks in th is area were missed by the first inspection team on June 16,

1986. These cracks were detected by a second inspection team which went in on June 17, 1986, to verify the inspection of the firs t team.

These cracks can not be detected from a standing position, and are approximately 1-2 mils in width. These cracks appear to be surface cracks.

The cracks in the West Vault Area (B57) between column lines N and M and between lA and 2A, as shown on Figur e 2,

were also dry with q

significant deposits of leachate at the basemat and wall junction.

These cracks also could not have been missed if they existed at the time of the first inspection, if the area was inspected at tnat time.

In addition, the previously identified cracks near the pr eviously unmapped cracks located in areas east of the Reactor Building were closely inspected, which r evealed no unusual sur face conditions which would imply deterioration of cracks previously identified.

c.

orientation The orientation of the previously unmapped cracks is generally in a east-west direction and par tly in a nor th-east or nor th-wes t diagonal direction. These orientations are consistent with the overall crack pattern previously determined.

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l 6.3 ' Establishment of current Baseline Figur es 2 and 3 show cracks iden tified upon the reinspection of the

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basemat during the weeks of June 16th and 23rd,1986, as well as original basemat cracks as indicated on LP&L drawings G-C-0003 and G-C-0004 with l

minor localized modifications in the configuration of a few cracks to l

match actual configuration more accurately.

The reinspection effort utilized the " Guidelines for Mapping Basemat Cracks" provided as Appendix B.

The LP&L drawings G-C-0003 and G-C-0004 will be accordingly revised i

and updated or new drawings will be developed and shall be considered the current baseline.

Basemat areas which were inaccessible and not i

inspected for cracks during June 1986 are shown on Figure 4.

The total inaccessible inspectable area was approximately 6,200 square feet or 11 l

i percent of the total inspectable area. The total inspectable area is the total basemat area minus those areas under backfill, concrete walls and i

columns, fill concrete under steel containment and water of the wet I

cooling towers. Areas which were not inspected are listed in Table 2 and will not be included in future inspections:

6.4 Movement of The Basemat l

The movement of the basemat has been monitored since the first concrete placement in Dece2er,1975. The basemat settlement for the period up to l

September,1983, is documented in the FSAR (Figure 2.5-117 ).

The basemat settlement for the period af ter Septeser, 1983, is shown on Figures 6 l

and 7.

The basemat settlements for the period since 1983 indicate that the basemat is continuously in a stabilized stage without significant soil consolidation except small upward and downward seasonal movement.

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The seasonal movement of the basemat has been expected and could be the j

reflection of seasonal groundwater and thermal variations.

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j Settlement points es tablished on the basemat have been monitored j

periodically, in accordance with LP&L Surveillance Procedure PE-5-033, since the original crack mapping.

A baseline date of July, 84, was j

established for this monitoring and readings were taken in October,1984, i

January, 1985,

May, 1985, and De ce2er,

1985.

Results of these measurements, plotted as settlement contours, are shown on Figures 8 thru 14.

Figur es 8 to 11 are che basemat settlements for each monitorin g period and Figures 12 to 14 are the accumulated settlements since July, 1984. The basemat has undergone slight movement during this time with no distinct trend being identified. However, the contours show that flexing of the basemat has occurred in a con figuration unlikely to cause the previously unmapped cracks.

6.5 ' Groundwater Elevation 4

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The groundwater elevation of the plant area is measured at least once every 92 days in accor dance with LP&L Surveillance Procedure CE-2-100 l.

(Reference 6).

Two groundwater sampling wells, located.approximately 6

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feet from the east and west exterior walls of the NPIS, have been 1

utilized for determining groundwater elevations since J une, 1985.

The groundwater elevations on various dates are shown in Table 3.

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The seasonal fluctuation of gr oundwater is very similar between both wells.

The maximum fluctuation for the period of June, 1985, to June 1986, is less than one (1) foot. The difference in groundwater elevation between the two wells is 0 to 0.27 ft.

The NPIS is designed for uplift loads based on minimum groundwater and river flooding eleva tions,

+5 and +30 ft., respectively (FSAR Pg. 3.8 -

69 & 70).

The observed groundwater elevations are well within the design limitations.

The small seasonal fluctuation in groundwater eleva tion would only cause a minor unloading of the Pleistocene clay supporting the NPIS.

This unloading (60 psf cut of a total net soil loading of 3,100 psf) is not believed to be suf ficien t to cause the previously unmapped cr a cks.

6.6 Basemat Construction sequence Analysis A construction s eq uence analysis was per formed as part of con firmatory analyses as requested by NRC.

This analysis has been partially reviewed

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by NRC but not published as of th is date.

The construction sequence analysis was per for med to provide a quantitative assessment of the basemat s tr ess es dur ing the basemat construction s ta ge. The analysis results were compared with the field observed data such as the location and the direction of the cracks (previously identified). The final stress r esults after the completion of the total construction sequence were evaluated.

The analysis was sensitive to the precision of the input settlement data.

s There fore, the analysis was regarded as an ef fort to provide a measure of the approximate point in time when these cracks may have occurred and to provide an estimate of the stresses to which the mat was exposed during the construction phase.

The analysis was per formed only until the completion of the basemat', there fore, any cracking due to additional superstr uctur e loadin g was not in cluded. Part of the results of the analysis were:

a.

Cracks observed on the top of the basemat most lik ely occurred during the basemat construction stage. The concrcte crack locations and pattern (along east-west direction ) predicted by the analysis matched very closely with those observed at the site (See Figure 15).

b.

The maximum rebar ten sion stress pr edicted by the analysis is 9 72 ksf (6,750 psi ) which is approximately 11 per cent of the yield stress of the rebar and occurs at the top of the basemat. Since the cr itical r ebar s tr ess of the basemat occurs at the bottom of the basemat, this small magnitu de of r ebar stress at the top of the basemat during construction is not of concern.

pO 6.7 structural significance of Previously Unmapped Basemat Cracks The latest visual inspection of all currently accessible areas revealed crack s, not shown on the original drawings, to be similar in age and l

character as the cracks pr eviously identified as shown on the original crack maps. This conclusion is supported by the following:

a.

The previously unmapped cracks of-the basemat fall in to two

. categories: 1) They are sealed and filled with leachate similar to those previously identified, and 2) They are fine cracks which could be classified as superficial in character but mappsble.

b.

Surfaces of cracks are dry except in a few localized areas similar to previously identified cracks.

c.

The pattern of leachate deposit for previously unmapped cracks and j

those previously identified is similar.

i d.

The orientation of previously unmapped cracks is consistent with the overall crack pattern previously mapped.

e.

All previously unmapped cracks are located in close pr oximity to other. cracks and in some cases appear to be an extension of previously mapped cracks.

f.

The previously unmapped cracks are in areas where the construction sequence analysis predicts cracking.

In addition, there are indications that new crack formation after 1983 is

. highly unlikely. These indications are as follows:

i There is no deterioration which could be detected in the previously i

a.

identified cracks.

J b.

From basemat settlement monitoring, it has been determined that the basemat has undergone slight movement (less than 0.04 feet) with no i

distinct trend being iden tified since the - baseline ' for settlement monitor ing in July, 1984.

The flexing of the 'basemat has occurred in a configuration unlikely to cause the previously unmapped cracks.

a c.

The groundwater monitor ing program sh ows seasonal fluctua tion to i

i have been small (less than one - (l) foot) and is not likely to have caused the previously unmapped cracks in the basemat.

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Fur thermore, the evaluation of the,previously identified cracks had j

concluded that "the cracks in the. Wa ter ford basemat,......

have no adverse influence on the structural integrity of the basemat. It is fully '

capable of functioning as required by the design in accordance with the pertinent codes." (Pg.23, Reference 5 which was submitted to NRC by LP&L Letter W3P84-3319 dated November 28, 1984).

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i Ther efor e, the previously unmapped cracks are judged to be similar in age and character to those cracks previcusly iden tified and appear to be members of the same family.

They are considered to be structurally insignificant and have no detrimental effects on the integrity of the

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basemat of the NPIS.

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REFERENCES:

1.

LPEL Surveillance Procedure "NPIS Foundation Basemat Integrity Check",

PE-5-033, Revision 1.

2.

Drawings: LP&L Dwg No. G-C-0003 *Basemat Crack Map Outside RCB - Sh. l',

and G-C-0004 "Basemat Crack Map outside RCB - Sh.

2".

3.

Report No. 8304-1 " Analysis of Cracks and Water Seepage in Founda tion Mat", Se ptent>er 19, 1983, Harstead Engineering Associates, Inc.

4.

"Non-Des tr uctiv e Test Evaluation of Basemat Con cr ete *,

Muenow and Associates, Inc., October,1984.

5.

"Sununary Evaluation - Structural Significance of Basemat Non-Destructive Tes ting Resul ts"

- Revision 2,

November 27,

1984, Ebas co Services Incorporated.

6.

LP&L Surveillance Procedur e Chemis try Technical Speci fica tions,

CE-2-100, Revision 1.

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TABLE 1 Page 1 of 3 O

LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 BASEMAT CRACK INSPECTION AREAS NOT INITIALLY INSPECTED REASON FOR NOT LOCATION AREA COLUMN LINES INSPECTING' AREA 1

Waste Filter Room, Oil H&J Climbing up to roof Separator Filter Room, 9A & llA above room and removing Laundry Filter Room concrete hatch cover was required; Opera tion of hoist was required.

2 Elevator and Machine H & J; Elevator Pit:

Room 6A & 7A Inaccessible elev'ator was in operation.

Machine Room:

Inaccessible concrete slab completely covered the area.

3 Hold-Up Tank Rooms G & H:

Had to climb 56 ft. down (A,B,C & D) 6A & 8A ladders to get to s

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basemat, making access diffi cult. Also, the size of the tank foundation left little j

basemat area available for inspection.

4 Boric Acid Make-Up B & J; Room was too congested Tanks A & B 4A & 6A for any meaningful inspection.

4 5

Boric Acid Precon-G & H; Clinbing up to roof above centrator Filter 3A & 5A room and removing concrete Rooms (A & B) hatch cover was required; Operation of hoist was required.

6 Charging Pump Rooms J & K; Rooms are at EL.-30.

(A, A/B & B) and 1A & 4A Removing a concrete hatch Access Hallway cover was required for access to basemat; Operation of hoist was required; Crawling was r equired below rooms and hallways to inspect basemat.

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TABLE 1 Page 2 of 3 LOUISI ANA POWER AND LIGHT COMPANY N 'j WATERFORD SES UNIT NO. 3 BASEMAT CRACK INSPECTION AREAS NOT INITIALLY INSPECTED REASON FOR NOT LOCATION AREA COLUMN LINES INSPECTING AREA 7

Emergency FW Pump K & L; Locked Area Secur ity

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(Turbine Driven) 4A & SA clearance was required.

Room 8

Pipe Chase in RCB Wing East: L&

Access to these areas Area N 0 llA; is to climb over a 7 '

South: 2A &

high wall for East and 7A 6 L; West chase and part of Wes t: L&P1 South chase. Most part 0 IM of South chase is inaccessible from El. -35; No ladder provided.

9 West vault Area M & II Surface covered with 1A & IM dirt and water.

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10 Wet Cooling Tower A N & R; Inaccessible - filled lA & 2A with water, 11 South Side - FHB; 4FH & SFH; Inaccessible - Area Inside Reactor T&U was covered with Building con cr e te.

12 East Cooling Tower Area S& U; Construction material East Side - FHB 9M & 12M; and missile grating 6FH & 7FH; laydown making part of U&V areas inaccessible.

13 Cooling Tower Area B R & V; Inaccessible due to 12A & 12M local construction activities.

14 Wet Cooling Tower B P1 & R; Inaccessible - filled 12A & 12M with water.

15 East Vault Area L&P; Inaccessible from El.

1 Diesel Oil Storage Tank B 12A & llA

-35. Had to climb down Sanitary Equipment Area from EL. +21 ( Access was blocked due to local construction activities)

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TABLE 1 Page 3 of 3 i

O LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 BASEMAT CRACK INSPECTION j

AREAS NOT INITIALLY INSPECTED l

REASON FOR NOT LOCATION AREA COLUMN LINES INSPECTING AREA-16 Others There might have been other areas that for one reason or another could j

not be inspected.

Areas in the West Cooling Tower t

-area between Column Lines S E V - Participant cannot recall at this time whether inspe ction of these areas of the i

basemat were made.

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TABLE 2 Page 1 of 3

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LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 BASEMAT CRACK INSPECTION AREAS NOT INSPECTED JUNE, 1986 REASON FOR NOT LOCATION AREA COLUMN LINES INSPECTING AREA 1

Outside NW corner of FHB 2M & 1FH; Inaccessible due to U1 &W installation of new radwaste tank and pumps.

2 South end of FEB 4FH & SPH; Inaccessible - a concrete T&U wall completely covers this area.

3 SE 'cornar of FHB 5FH & 7FH; High Rad Area; T&U Locked access.

4 Wet Cooling Tower A lA & 2A; Inaccessible - area is N& R normally filled with water.

5 Wet Cooling Tower B 12A & 12M; Inaccessible - area is P1 &R normally filled with water.

6 Pipe Chase in RCB East L& N at llA High Rad Area.

Wing Area 7

Pipe Chase in RCB West 2A & 7A at L High Rad Area.

Wing Area L&P1 at IM 8

Equipment Drain Tank 5A & 6A; High Rad Area.

K&L 9

Charging Pump Rooms ( A, lA & 4A; Dif ficult Access - Rooms A/B & B) and access hallway J&K are a t El. -30.

A concrete hatch cover must be removed for access to basemat; Operation of hoist required; Crawling below rooms and hallway to inspect basemat would be r eq uir ed.

10 Elevator Pit 6A & 7A; Inaccessible - elevator p

H&J in operation.

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TABLE 2 Page 2 of 3 LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 BASEMAT CRACK INSPECTION AREAS NOT INSPECTED JUNE, 1986 REASON FOR NOT LOCATION AREA COLUMN LINES INSPECTING AREA 11 Elevator Machine Room 6A & 7A; Inaccessible - a 2 '-4 H&J con crete slab comple tely covers this area.

12 Waste Filter Room H & Jr Dif ficult Access - a 9A & 10A concrete hatch cover must be removed for access to basemat; Operation of hoist required.

13 Oil separator Filter Room H & J; Dif ficult Access - a 9A & 10 A concrete hatch cover must be removed for access to basemat; Operation of hoist required.

14 Laundry Filter Room H & J; Dif ficult Access - a 10A & llA concrete hatch cover must be removed for access to basemat; Operatico of hoist required.

15 Spent Resin Tank Room 1A & 2A; High Rad Area.

G&H 16 Spent Resin Transfer 1A & 2A; High Rad Area.

Pump Room G&H 17 Waste Condetsate Ion 2A & 3A; High Rad Area.

Exchanger F3om G&H 18 Boric Acid Preconcentrator 3A & 4A; Dif ficult Access - a Filter "A" Room G&H concrete hatch cover must be removed for access to basemat; Operation of hoist required.

19 Boric Aci3 Preconcentrator 4A & SA; Dif ficult Access - a Filter "E" Room G&H concrete hatch cover must be removed for access to basemat; Operation of hoist required.

O

TABLE 2 Page 3 of 3 O

LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 BASEMAT CRACK INSPECTION AREAS NOT INSPECTED JUNE, 1986 REASON FOR NOT LOCATION AREA COLUMN LINES INSPECTING AREA 20 Holdup Tank Rooms 6A & 8A; Inspector must climb 56

( A, B, C, & D)

G&H ft.

down ladders to get i

to the basemat, making access dif fi cult.

Also, the size of the tank foundation leaves little basemat area available for inspection.

21 Boric Acid Make-Up 4A & 6As High Rad Area.

Tank Rooms (A & B)

H&J 22 Reactor Building Inaccessible Con cre te fill completely covers this area.

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TABLE 3 l

-LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3

)

NUCLEAR PLANT ISLAND STRUCTURE GROUNDWATER ELEVATION (FT. )

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LOCATION DATE EAST WELL WEST WELL 6/ 13/ 85 11.50-11.50 9/21/85 10.7 0 10.9 7 11/25/85 11.65 11.52 I

3/6/86 11.57 11.70 6/2/86 11.67 11.80 l

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APPENDIX A i

Letter f rom Consulting Engineer-Dr. A. V. du Bouchet;h Dated 6/24/86 I

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ANDRES V. DU BOUCHET, PH.D., P.E.

CONSULTING ENGINEER O

9 Meadowlark Lane Fast Brunswick. New lersev 08816 June 24,1986 Project Number 8605 Mr. R. F. Burski Engineering & Nuclear Safety Manager Loulslana Power & Light Post Office Box B t

Killona. Loulslana 70066 Dear Mr Burski-This letter summarizes my visit to Waterford III on June 21 to review the current LP&L/Ebasco basemat crack mapping program.

LP&L initiated a program on June 16 to examine all accessible areas of the

' i Waterford III NPIS basemat outside of the containment structure. During this C.

survey, LP&L and Ebasco technical personnel documented cracks in areas that may not have been surveyed in August / September,1983. At that time, portions of the basemat were not accessible due to ongoing construction, materiallaydown, standing water, and lack of access. The initial mapping effort did not document areas of the basemat that were not surveyed at that time.

t On June 21, Mr. Sam Horton and Mr. Gavin Wu of Ebasco, Mr. Robert Bagnetto of LP&L and I inspected the basemat to review the cracks mapped by LP&L and Ebasco during this current survey.

I cannot confirm that several recently inspected areas were originally inspected in August / September.1983, facluding the areas behind the east and west dry cooling towers, the east and west vault areas, the sanitary equipment room, and the diesel storage tant B room.

l I do recall mapping cracks in dry cooling tower area B where several additional cracks were mapped during the current survey. liowever, portions of the basemat in this area were inaccessible at the time of the original survey because of on-going construction activity and material laydown.

l

1 A number of the cracks mapped by LP&L and Ebasco during the current survey, as shown on the attached sketch, appear to be superficial in character.

T Such cracks were not mapped in the original survey.

I note that the mapping effort originally conducted in August / September, 1983 remains an accurate record of the crack patterns in those areas.

Please don't hesitate to contact me if I can be of any further assistance in this matter.

Sincerely yours,,

Odl b Andres V. du Bouchet 0

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WATERFORO S.E.S. UNIT NQ 3 W V Ui Tz To S

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APPENDIX B Guide Lines for Mapping Basemat Cracks s

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EBASCO SERVICES INCORPORATED NEW ORLEANS, LOU ISI ANA l

4 LOUISIANA POWER AND LIGHT COMPANY WATERFORD S'ES UNIT NO. 3 8

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GUIDELINES FOR MAPPING BASEMAT CR ACKS f

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Issue Prepared By Approved By Date

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Original G. J. Sgier, di' I. Bari 6/ 16/ 86 1

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EBASCO SERVICES INCORPORATED GUIDELINES FOR MAPPING BASEMAT CRACKS

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1.0 SCOPE-i p

1 These guidelines shall be followed to map the cracks located in the concre te common foundation (basemat ) which is depicted ' on Ebas co drawings LOU-1564-G-499 ~ S01, S02 and S03.

i

2.0 BACKGROUND

The Nuclear Plant Island Str uctur es ( NPIS ),

consis ting of Reactor e

i Building, Reactor Au xiliary Bu ilding, Fuel Handling Building at d Cooling Tower Areas, are supported on a 12 ft. thick - concrete commca l

foundation (basemat) with top of basemat at EL. (-) 35.00 feet. Over the years, hairline cracks, dry and wet leachate and water seepage

{

from the basemat have been observed.

The basemat cra cks wer e l

initially mapped in August / September 1983.

However, these crack maps

]

did not repr es ent the entire basemat since some ar eas wer e inaccessible due to constr uction activities or other reasons.

Therefore, a complete mapping of the basemat is required in order to establish a baseline, i

i 3.0 GUIDELINES i

3.1 All areas of the basemat shall be inspected for cracks in accordance wi th the following guidelines.

Wall crack s are not required to be mappe d.

3.1.1 Each inspection team shall consist of at least two (2) people, one of-which shall be a Civil Engineer.

3.1.2 The basemat shall be inspected in a systematic way to assure that all i

areas will be inspected.

Ebasco drawings G-C-0003 and G-C-0004 (Rev.

l

0) depict the location of existing cr ack s and shall-be used for-refer ence.

7 j

3.1.3 Inspection shall be visual and care shall be taken to obtain all data as required by paragraph 3.1.5.

Optical-instruments or magnifiers j

are not r equired except for the determination of crack width (See j

paragraph 3.1.5e ).

},

3.1.4 Flashlights shall be used as required for a thorough inspection.

j 3.1.5 The following data shall be obtained for each area _ inspected.

All data shall be complete and clearly legible.-

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a.

Document length of crack and location of ' the two (2) terminal points. from a specific reference poin t(s )

(e.g. wall, column, i

etc).

Path of the crack, including branches, shall-be drawn freehand depicting the actual configuration as close as possible.

b.

Existing - floor cracks shall be~ inspected and compared to the applicable crack s shown 'on Ebasco-dr awings G-C-0003 and G-C-0004.

Incr ease in extent of exis ting crack or additional l

brand cracks shall be documented.

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4 EBASCO SERVICES INCORPORATED GUIDELINES FOR MAPPING BASEMAT CRACKS c.

Document lighting conditions (good or poor ) in the ar ea.

d.

Document whether the floor is dry or wet; clean or dirty.

e.

Document whether crack is open or if it is simply identified by presence of leachate.

Width of open cracks shall be determined by an optical magnifiet and documented.

f.

Document whe th er cr a ck is dry or vet.

If leachate is pr es en t document if leachate is dry or wet.

g.

Document location of patched ar eas and loca tion of cr a ck s, if applicable, in the patched areas.

Document if cracks appear to be shrinkage cracks.

h.

Areas / rooms without any floor cr ack shall be so identified and r

documen ted.

i.

Painted floor areas shall be inspe cted and also documented as such.

j.

Inaccessible spaces within accessible areas shall be located and documen ted as to why they are inacessible (e.g.

ver y con ges ted-pipin g) k.

Raised pads / foundations in areas where floor cracks are present shall be approxima tely loca ted.

Foun da tions in th ese areas shall be inspe cte d for cr ack s and r es ults of inspection documen ted.

1.

North arrow shall be shown on all sketches.

m.

Areas which are tempor ar ily inaccessible due to ma in tenance,

modification work or other reason (s) shall be documented with an explanation of the reason (s) for inaccessibility.

n.

Documen t anyth ing which may be considered impor tant in association with the floor cracks keeping in mind that they will be inspected every 18 months to determine if they have opened or if new cracks have developed in the area.

~

3.1.6 Open areas which are wet due to rain shall r.ot be inspected until area has been dry for at least one (1) day.

l 3.2 All permanent inaccessible areas shall not be inspected and shall be so documen ted with an explanation of the r eas on (r )

for inaccessibility such as high radiation, pool of water, equipment, very congested - piping, etc.

_2_

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EBASCO SERVICES INCORPORATED GUIDELINES FOR MAPPING BASEMAT CRACKS 4.0 DOCUMENTATION 4.1 Inspection of the basemat for all areas shall be documented on the attached inspection report form.

4.2 All inspecti on r epor ts and atta chmen t sk etch es shall be legibly signed (not initialed) and da ted by each of the inspection team members. All reports and sketches will become a permanent record.

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LOUISIANA POWER AND LIGHT COMPANY WATERFORD SES UNIT NO. 3 CUIDELINES FOR MAPPING B ASEMAT CR ACKS BASEM AT INSPECTION REPORT A.

DATE OF INSPECTION:

B.

INSPECTION TEAM:

C.

LOCATION:

REF. DWG.

REV.NO.

ROOM / AREA NO.

D.

VISUAL INSPECTION OF AREA:

1.

WITH CRACK - SEE SKETCH FOR DETAILS (NO. SKETCHES ATTACHED

)

ORY WET OPEN CRACK (WIDTH:

)

W/ DRY LEACHATE

_ / WET LsACHATE P.ATCHED AREA SHRINKAGE CRACK W

RAISED PsO/ FOUNDATIONS IN AREA 07 TLOOR CRACKS:

NO YES (INSPECTION REQ'D - DESCRIB2 RESULTS BELOW)

/

2.

WITHOUT CRACK s]'

3.

OTHER:

PAINTED SURFACE (INDICATE WITH OR WITROUT CRACKS)

INACCESSIBLE DUE 70 HIGH RADIATION PHYSICALLY INACCESSIBLE (DESCRIDE HFLOW)

TEMPORARILY INACCESSIBLE (DESCRIBE BEVJW) 4 4.INACC33SIBLE SPACES WITHIN ACCESSIBLE AREA:

NO YES (DESCRIBE BELOW) r 4 0

5. AREA CONDITION:

WET DRY; CLEAN DIRTY

_ GOOD LIGHTING POOR LIGHTING CONGESTED (DESCRIBE BELOW)

OTHER (DESCRIBE BELOW)

E.

REMARKS:

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Text

3.0 CONCLUSION

5.0 BACKGROUND

3.0 CONCLUSION

5.0 BACKGROUND

REFERENCES:

2.0 BACKGROUND

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