ML20062G852

Rev 8 to Functional Requirements for Drywell Containment Vessel Thickness Exam.

ML20062G852
Person / Time
Site:	Oyster Creek
Issue date:	02/19/1987
From:	Martin J GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20062G848	List: ML20062G845 ML20062G849 ML20062G852 ML20062G855 ML20062G860 ML20062G864
References
IS-328227-004, IS-328227-4, NUDOCS 9012030053
Download: ML20062G852 (13)

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INSTALLATlON  !

SPECIFICATION '

FOR

' OYSTER CREEK FUNCTIONAL REOUIRDtENTS FOR DRWELL CONTAINMENT VESSEL THICKNESS EXAMINATION l

PREPARATION L , N&I- DATE IENGINEERING AP OVAk IY DATE QA CONCURRENCE M '

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-TRY.gCTIONAL R.EQUIREMENTS FOR DRYWELL SHELL THICKNESS INS i I

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$UMMARY OF CHANGE l-APPROVAL DATE ~] i!

l I l.0 Added inarructions on data  !

submittal and that evaluation is not needed for restare.

1.).3.1 Revised accou to be inspected. l i.0 i Add d utatement on analyals of data. -

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- Replaced Reference 2.6, and added 2.8 thru 2.12. ( <

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3.1.4.2 to detine new prid inspect ion

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, ,, DOCUMENT NO.

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NN IS-328227-004 FUNCTIONAL REQUIREMENTS FOR DRYWELL CONTAINMENT VESSEL THICKNESS EXAMINATION REV

SUMMARY

OF CHANGE APPROVAL DATE j

8 Revision 8 adds a new priority #1 inspection location based on previous inspections at elevation 51' 10". Also, the requirement for fj g/ /50 an expanded scope inspection of this elevation (performed in April per revision 7) was de,leted. [ $f2[90

^'"'A, Q A & f & W b & A*h6. '

Ib N0036 (03 90)

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,t_ ..O Is-338aa7-004 Rev. 8 Page 2 of 10 4

TABLE OF CONTENTS SECTION ILTLE 2A9.E 1.0 scope 3

2.0 REFERENCES

3 3.0 REQUIREMENTS 4 4.0 QUALITY ASSURANCE 7 5.0 INFORMATION TO BE SUBMITTED 8 6.0 ATTACEMENTg 8 I

004/0022.4

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. 2S-338827-004-Rev. 8 Page 3 of 10 1.0 ggop,3 i

This specification establishes the minimum rwquirements for ultrasonic testing (examination) of the Oyster Creek drywell containment vessel for wall thickness measurements. l 1.1 Revision 8 of this specification provides an inspection scope and frequency up to the 13R outage. Ultrasonic testing (UT) is to be performed during forced outages whenever a drywell entry is otherwise planned or required (referred to as " Outage of opportunity"),as well a refueling outages. Data shall be taken as a minimum at the time indicated in Section 3.1.3 herein.

1.2 All da' a shall be forwarded to Technical Functions for l g

evaluation. Evaluation of data is not required for plant restart.

2.0 REFERENCES

l l 2.1 ASME B&PV Code Section V, 1977 Edition through Addenda Summer, l 1978. j 1

2.2 ASME B&PV Code Section XI, 1977 Edition through Addenda Summer, '

1978.

2.3 NRC letter dated January 14, 1987, titled " December 19, 1986, l Third Meeting with GPU Nuclear (GPUN) to Discuss Corrosion of I the Outer Surface of the Drywell Shell."

2.4 GPUN 6100-STD-7230.01, "NDE Personnel Qualification and ,

Certification."

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2.5 GPUN 6130-QAP-7209.24, Rev. O, " Ultrasonic Thickness i Measurement."

l 2.6 GPUN Sketch, Dwg. No. SK-S-89.

l 2.7 GPU' Sketch, Dwg. No. SK-2B3.

L 2.8 QC Thickness Data Sheet as listed herein.

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l l 004/0022.5

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, IS-328227-004 Rev. 8 Page 4 of'10 3.0' REQUIREMENTS l

3.1 Hon-destructive Examinations 3.1.1 Personnel Qualification L 3.1.1.1 Ultrasonic personnel shall be qualified and l certified in accordance with Reference 2.4 or a  !

l GPUN approved vendor SNT-TC-1A program. ,

3.1.2 Examination Methods / Equipment lj 3.1.2.1 Ultrasonic examination pulse-echo equipment cap-l able of thickness measurement by the digital and

. A-scan on a CRT screon shall be utilized. One L instrument capable of both presentations or two

l. separate instruments are acceptable, f

4 Digital readout equipment shall-have printout i capabilities and memory storage traceable to

-sequential readings.

The digital readout equipment shall be the primary technique employed to measure wall thinning. A-scan on a.CRT screen shall be utilized to confirm in wall reflectors. The UT u method shall be performed in accordance with Reference 2.5.

3.1.3 Data Acquisition Priorities Locations I

.3.1.3.1 Each area: indicated in Section 3.1.3.2 shall be inspected, at the time interval required, on the basis of its assigned priority.-

Inspection requirements for each priority are as follows:

Priority 1 areas are to be: Inspected in each outage of opportunity but not more frequently than approximately once every'three months.

Priority'2 areas ute to be inspected in'an outage of opportunity if the previous set of data was ,

taken 18 months or more before'the outage.

p 3.1.3.2 Revision 8 of this specification adds several priority #1 locations at elevation 51' 10". These locations were initially inspected in April 1990.

004/0022.6

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. IS-328827-004 Rev. 8 Page 5 of 10 The drywell vessel wall at the following 4 locations shall be investigated: )

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a. Grids at floor elevation 11'3" original Oc 6"x6" Grid Thickness (See Exhibits Data Sheet Area 1&2 Number Eglority 9 D 87-026-59 1 l 11 A 86-049-24 1 l 11 C 86-049-37 1 l 13 A 87-026-58 1 13 D 87-026-67 1 15 D 87-026-58 1 I

17 A 87-026-58 1 17 D 86-049-26 1 )

17/19 Frame 87-026-66 1 1 19 A 86-049-27 1 19 B 86-049-28 1 19 C 86-049-29 1

b. Original QC Thickness Crids At Data Sheet Priority Floor Elevation 51-D1 87-026-26 1 Elevation 51', Bay 13 87-026-122 1 Elevation 51', Bay 5 87-026-124 1 Elevation 51', Bay 15- 87-026-123 1 h Elevation-l -52', Bay 13 87-026-144 1 (area 32)

Top of Biological I Shield 86-20 87-026-30 1 '

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004/0022.7 l

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. IS-328227-004 l Rev. 8 i Page 6 of 10 l

b. (Cont.) Original QC-Thickness Grids At Data Shegg Priority Top of Biological Shield 86-28 87-026-3*, 1 Top of Biological Shield 86-31 87-026-38 1 l

c. Strips at original QC l Floor Ele- Thickness 1 vation 11'3" Data Sheet Priority 1 1D 87-026-54 2 3D 87-026-55 2 SD 87-026-56 2 7D 87-026-57 2 9A 87-026-60 2 j 13C 87-026-61 2 '

l 15A '87-026-62 2 l l

3.1.4 Records t

3.1.4.1 All grid UT data in Section 3.1.3.2 shall be .i' taken at the same locations as those taken previously and using the 6"x6" grid (7x7 array) as defined in-QC data sheet 86-049-13. The readings shall be taken within the tolerance specified in 4.2.1.

3.1.4.2 All UT data in Section 3.1.3.2 shall be taken

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at the same locations as those indicated on the original. thickness data sheetw.

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3.2' Orcanizational and Functional Recuirements 3.2.1 WorktobeherformedbyMaintenance,Constructionand Facilities (HCF) i l 3.2.1.1 Supply tools and materials required for surface i l- preparation of the coated steel (coating removal) as required.

3.2.1.7 Prepare the 6"x6" grid identified in 3.1.3.1 and 3.1.3.2, and 3.1.3.3 as directed by. Quality Control (QC;. Preparation technique'shall be such thac no base material is removed.

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.. d 4 IS-328227-004 Rev. 8 Page 7 of 10 3.2.3.3 After UT inspection of grids, the area shall be coated with Syncogel White E.P. grease stock

1. 412-120-66-00-0.

3.2.1.4 Temporary planking shall be provided as necessary at the top of the biological shield extending to the drywell wall. It is not intended that the planking +

be continuous for the entire circumference. The planking shall be such that it can be moved along as work continues. ,

3.2.2 Duties to be performed by Quality Assurance Department 3.2.2.1 The NDE/ISI Oroup shall perform the thickness examinations required by this specification and interface with Technical Functions as required.

3.2.2.2 The NDE/ISI Group shall be responsible for the conduct and implementation of the requirements of this specification and the interface requirements of 3.2.2.

4.0 QUALITY ASSURANCE 4.1 All work shall be performed in accordance with GPUN Operational QA Program. This work is classified Important-to Safety / Nuclear Safety Related. s 4.2 Locations of Inspection Points 4.2.1 NDE/ISI shall verify that locations (specified in Section 3.1.3.2) of UT measurements performed are within 11/8" of -

the designated locations.- This shall be accomplished =by use of~a template (see Exhibit 2). The drywell wall was previounty stamped at the notches provided in the' tem-plate with low stress die stamps. The locations of investigation shall be repeated-by use of these stamps for relocating the template.

4.2.2 This template shall be made of 304 or-316 SS sheet metal of approximately .030 inch thickness. The template shall be six inches square with circular-holes cut out on one inch centers. The diameter'of the holes shall be suffi-cient to allow 1/2-inch diameter UT transducers to fit through the template. Typical grid pattern shall ne as-shown in Exhibit 2.

004/0022.9

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o IS-328227-004 Rev. 8 Page 8 of 10 5.0 INFORMATION TO BE SURNITTED 5.1 UT data sheets and calibration sheets in accordance with Reference 2.5. Analysis of data is not required prior to restart.

6.0 ATTAQEMEEER 6.1 Exhibit 1 - Typical Area of Exams at Elevation 11'3".

6.2 Exhibit 2 Typical Grid Pattern (6"x6").

6.3 Exhibit 3 - UT Layout Number System.

004/0022.10

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• - 85-33C227-004 Rev. 8 Page 9 of .10 EXIIBIT 1 l.

Tyoical Area of Exams at Elevation 11'3" Cowetenst VI#r L i .

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• l EIIIBIT 2 Tvcical Grid Pattern (6" x i ,t

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00000-00400-0000o-00000-4 . . . . .

004/0022.11

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.,. Is-320227-004 Rev. 8 Page 10 of 10 EIBIBIT 3 UT Layout Numberino System A B C D Bay 1 1 2 3 4 l

3 5 6 7 8 5 9 10 11 12 7 .13 14 15 16 9 17 18 19 20 11 21 22 23 24 13 25 26 27 28

, 15 29- 30 31 32 17 33 34 35 36 19 37 38- 39 40-004/0022.12 l 1

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