ML20066F419

Rev 3 to 2306.010, Spent Fuel Pool Crack Mapping & Visual Insp

ML20066F419
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/16/1990
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML20066F410	List: 2CAN019108, Responds to 900830 Request for Addl Info Re 891019 Proposed Tech Spec Change for Insp Frequency of Spent Fuel Pool.Insp Procedure Encl ML20066F419
References
2306.010, NUDOCS 9101230320
Download: ML20066F419 (14)

Text

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ARKANSAS POWER & LIGHT COMPANY wE Arkansas Nuclear One d AP&L m necoRD 0, ceAms.~D ev,s,0~s

,0.,ooo.oo.A e v,o MECHANICAL PERIODIC TEST SAFETY RELATED YES 05 NO O SPENT FUEL POOL CRACK MAPPING PAGE 10, AND VISUAL INSPECTION W

2306.010 REV. 3 M 3 Contralled Copy #[/

PAGE REV'"

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COGNIZANT AUTHORITY APPROVAL:

APPROVAL DATE:

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S /4 - 10 REQUIRED EFFECTIVE DATE:

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"<w/w CHANGE Dart TABLE OF CONTENTS SECTION PAGE NUMBER 1.0 PURPOSE 2

2.0 SCOPE 2

3.0 DESCRIPTION

2

4.0 REFERENCES

2 5.0 TEST EQUIPMENT, SPECIAL TOOLS, AND SUPPLIES 3

6.0 LIMITS AND PRECAUTIONS 3

7.0 PREREQUISITES AND INITIAL CONDITIONS 3

8.0 INSTRUCTIONS 4

8.1 Crack Mapping 4

8.2 Visual Inspection 4

9.0 RESTCRATION AND CHECKOUT 5

10.0 ATTACHMENTS AND FORMS 6

10.1 Attachment A, Plan @ El. 404'-0" 7

l 10.2 Attachment B, Concrete Crack Pattern Grid Zone I 8

10.3 Attachment C, Concrete Crack Pattern Grid Zone II 9

10.4 Attachment D, Concrete Crack Pattern Grid Zone III 10 l

l 10.5 Attachment E, Concrete Crack Pattern Grid Zone IV 11 10.6 Attachment F, Table I Screening Criteria Crack Width and Length 12 10.7 Attachment G, Evaluation Report 13 l

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o^ti o4n9m CHANGE DATE 1.0 PURPOSE 1.1 The purpose of this procedure (originally 2304.78) " Spent Fuel Pool Crack Mapping and Visual Inspection" is to provide instruction for a long term survey and extanded mapping program to ensure that the structural integrity of the Unit 2 spent fuel pool is intact. This procedure and inspection program were implemented in response to a construction error in which some corner reinforcement bars was misplaced in the spent fuel pool structure.

1.2 This procedure requires a periodic inspection of the four grid zonec laid out on the pool's concrete surface - two along the concrete slab, Elev.

404'. and two on the exterior face of the pool wall along column line 4.

All cracks discovered within these grids are to be clearly marked if the width exceeds 0.010 inches and plant engineering is to be promptly noti-fied of these findings.

Upon completion of each inspection, plant engineering shall review the inspection team's comments and complete the Engineering Evaluation Report.

2.0 SCOPE l

2.1 The scope of this procc@ re is to provide instructions for a mapping program to ensure that the structural integrity of the Unit 2 spent fuel I

pool is maintained.

2.2 This procedure also provides instructions for performing a visual inspection to verify that structural integrity is maintained.

l 2.3 Prior to the initial filling of the spent fuel pool, each square I

within the mapped areas shall be visually examined.

3.0 DESCRIPTION

Four permanent grids have been laid out on the concrete surfaces at the l

spent fuel pool. Two are on elevation 404'-0" slab and two are on the exterior face of the column line 4 wall as shown on Attachment A.

The grids shall consist of 12 inch squares arranged in the patterns shown on Attachments B through E.

The grids are laid out using paint or some other permanent type of marking system.

Should the pattern deteriorate during the life of the plant, it shall be re-established. The width of every visible crack shall be measured by optical comparator at what is

udged to be the widest point on the portion of the crack line lying within the mapped area. If the measured width equals or exceeds.010 inch the crack shall be mapped according to the following procedure.

4.0 REFERENCES

4.1 References used in development of procedure.

4.1.1 Tech. Spec. #4.7.12.2, 3/4.7.12.

4.1.2 Bechtel Spec. 6600-C-2302, Section 14.

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a om em cHAmot Dart 4.1.3 Bechtel Correspondence BL-G-464.

4.1.4 1025.03 Conduct of Maintenance 4.1.5 1025.09 Maintenance Procedure Format and Content 4.2 References which are required to perform this procedure.

4.2.1 None 4.3 Regulatory Correspondence containing NRC commitments which are implemented in this procedure.

4.3.1 Letter of July 1, 1976, To Mr. J. F. Stolz, Chief Light Water Reactors Branch #1, U. S. Nuclear Regulatory Commission, Fromi William Cavanaugh III, Item 6, Last Sentence, (See File #2-0550.1)

S.0 TEST EQUIPMENT 5.1 Bausch & Lomb, Inc., Measuring Magnifier, CAT #81-34-35 or equivalent with scale of 0 to.500 in.

6.0 LIMITS AND PRECAUTIONS 6.1 Equipment used in performance of this task is available.

6.2 Take precautions to assure nothing is dropped in spent fuel pool.

6.3 Maintain required cleanliness level as specified by procedure 1025.019 6.4 Observe all Radiological and Safety postings.

6.5 The steps in this procedure need not be followed in sequence.

6.6 Wipe the surface to be examined to free it of abrasive grit.

Similarly, brush off any grit which may have accumulated on the scale.

Set the magnifier directly on the surface so that the scale is in contact with the material to be measured. This will ensure that measurements are as accurate as possible, 7.0 PREREQUISITES AND INITIAL CONDITIONS INITIAL /DATE 7.1 Obtain clearance from Shif t Supervisor prior to starting test.

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7.2 Verify test equipment Calibration data is current and M&TE Number is assigned.

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7.3 Review procedure to assure that it is current and complete.

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=== amm CHANGE DATE 8.0 INSTRUCTIONS i-8.1 Verify the grids are intact and clearly marked as specified in the description of the procedure.

IF NOT, THEN re-establish the grids using some type of permanent marker.

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8.2 Crack Mapping 8.2.1 Measure the width of an existing crack at the point where the previous measurement was made and as required to define changes in crack characteristics.

The crack width and length shall be recorded on the data sheet (attachmeat B - E).

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Record length increases Weec+sNd4rtr2.

8.2.2 extending the existing permanent type marking line and noting the new end point by a short cross line.

Crack lengthening activity shall be marked using another color and dated.

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S.2.3 Measure the width of any new or previously mappedEhe 0;f-crack at the point judged to..be _the widest.

-r.w Trachsh ati-be-ma rk cL4deewdtep-hMt%~mtSF if-the_ mea.surnd eiM G e q ua M T b cshis 7 t Gtch, All new crack activity shall be marked using a permanent type marking system and dated.

The color shall be the same as that used for identifying crack increases.

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l NOTE l

l Minor spalling in this area is not an indication of a structural failure.

l 8.2.4 IF Spalling of concrete occurs on the exterior face of the column at elevation 404'-0" as indicated on Attachment A.

THEN repair the concrete in accordance with Specification 6600-C-2302, Section 14.0, repair of concrete.

IF NOT, THEN mark this step N/A.

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8.2.5 Make a sketch of the crack made on the appropriate data form, Attachments B through E. A decrease in crack width and length shall be indicated on the

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a Repairs needed Yes 40

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aAr= alivew CHANGE DATE 8.3 visual Inspection l

NOTE l

l Due to erroneous installation of reinforcing steel into the wall front face l

l instead of the rear face of the adjoining walls during construction, a visual l

l inspection is required to assure that structural integrity is maintained and l

l that pool remains safe for use.

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l 8.3.1 Perform visual inspection of accessible interior and exterior spent fuel pool surfaces, the struts in the tilt pit, the separation wall surfaces and the structural slabs adjoining the pool walls.

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8.3.2 Visually verify no changes in concrete crack pat-terns. No abnormal degradation or other signs of structural distress (i.e., cracks bulges, out of plumbness, leakage, discolorations, efflore-scence, etc.)

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8.3.3 Record any deficiencies or changes noted on Attachment A through E, as applicable.

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8.3.4 IF any changes or deficiencies are noted, THEN notify the engineering section immediately and get an evaluation.

IF an evaluation is made, THEN attach to the procedure to be returned I

to records for inclusion in J.O. package.

l IF no evaluation is required, THEN complete the procedure and return through normal process.

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9.0 RESTCRATION AND CHECKOUT l

9.1 Verify that all permanent grids are clearly marked.

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9.2 Notify Shif t Supervisor that activity is completed.

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Q.S Verify that all required steps of this procedure have been j

completed.

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9.4 Verify that all deficiencies found have been recorded on Attachment G and reported to the Plant Engineering Section.

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PAGE 6 of 13 ARKANSAS NUCLEAR ONE a-3 o*a 04/19/90 CHANGE DAtt 9.3 Verify that all cracks exceeding the Screening criteria of Attachment F have been examined and are within the Acceptance Criteria of Unit 2 Tech. Spec. 4.7.12.2 or the appropriate reporting requirements have been initiated. The appropriate corrective action has been initiated as specified by Engineering and the Job Request / Job Order Number recorded below.

Job Request / Job Order Number (if applicable).

PERFORMED BY

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Signature Date REVIEWED BY

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Civil Engineer Date 10.0 ATTACMMENTS AND FORMS l

10.1 Attachment A, Plan @ El. 404'-0" 10.2 Attachment B, Concrete Crack Pattern Grid Zone I 10.3 Attachment C, Concrete Crack Pattern Grid Zone II 10.4 Attachment D, Concrete Crack Pattern Grid Zone III 10.5 Attachment E, Concrete Crack Pattern Grid Zone IV 10.6 Attachment F, Table I Screening Criteria crack Width and Length 10.7 Attachment G, Evaluation Report

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ATTACHMENT G EVALUATION P.EPORT Findings: An inspection of the spent fuel pool grid zones was made on The following information was noted by the inspection team.

Date Plant Engineering is requested to evaluate the following specific cracks or un-usual conditions.

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Conclusions:==

Information from the above referenced inspection has been reviewed and the following conclusions were made l

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Recommendations: The following recommendations and/or corrective action should be implemented

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