1CAN028703, Steam Generator Tubing Inservice Insp Rept for Seventh Refueling Outage

Steam Generator Tubing Inservice Insp Rept for Seventh Refueling Outage

ML20211G961
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/04/1987
From:	Enos J ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1CAN028703, 1CAN28703, NUDOCS 8702260022
Download: ML20211G961 (10)

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A ARKANSAS NUCLEAR ONE-UNIT ONE STEAM GENERATOR TUBING INSERVICE INSPECTION REPORT FOR THE SEVENTH REFUELING OUTAGE INSPECTION

SUMMARY

An inservice eddy current inspection was performed on tubes in the Arkansas Nuclear One Unit 1 (ANO-1) Once Through Steam Generators (OTSGs) "A" and "B" during the period from September 15, 1986 to November 21, 1986. The previous inservice inspection, conducted in late 1984, resulted in a twenty four (24) month inspection interval (per ANO-1 Technical Specification 4.18.4.b). The seventh refueling outage (1R7) inspection was performed in accordance with the Technical Specifications.

The inspection was conducted in accordance with Technical Specification 4.18.3 and Technical Specification 4.18.2. The first sample included the 3%

random sample from each steam generator with exceptions as provided in Technical Specification 4.18.3.a. Subsequent samples in the "A" 0TSG were inspected in accordance with Technical Specification Table 4.18.2.

In the "A" OTSG, 3,608 tubes were inspected full length. In addition, all 4,622 non plugged tubes in the wedge region (described in Technical Speci-fication Figure 14.18.1 and Technical Specification 14.18.3.a.3(31) were inspected from the 15th tube support plate up. Ten sleeved tubes, which were sleeved during the sixth refueling outage (1R6) as part of a demon-stration program, were also inspected for the 80 inch length of the sleeves.

The sample inspection of the "A" 0TSG had Category C-2 results. Subsequent inservice inspections should be conducted at 10 to 24 month intervals in accordance with the current Technical Specifications.

In the "B" 0TSG, 831 tubes were inspected full length. In addition, all 4,684 non plugged tubes in the wedge region (described by Technical Specification Figure 14.18.1 and Technical Specification 14.18.3.a.3(3))

were inspected from the 15th tube support plate up. The sample inspection of the "B" OTSG had Category C-1 results. Subsequent inservice inspections should be conducted at 10 to 24 month intervals in accordance with the current Technical Specifications.

The multi-frequency method of eddy current testing was utilized during the inspection to determine tube wall degradation.

INSPECTION RESULTS Tube wall degradation was observed in both the "A" and "B" OTSGs. In the "A" OTSG eight defective (i.e., >40% through wall imperfections per Technical Specification 4.18.5.a.5) tubes were identified. These eight tubes were sleeved. In the "B" OTSG three defective tubes were identified.

These three tubes were plugged.

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Tables 1 and 2, attached, list the defective tubes for the "A" and "B" OTSGs, respectively. Defect location, size (% through-wall) and disposition are also listed. Tables 3 and 4 list the remaining reportable indications

(>20 but <40% through-wall imperfections per Technical Specification 4.18.5.a.1) in the "A" and "B" OTSGs. Degradation location, size and disposition, if any, are also provided.

These lists complete the reporting requirements of Technical Specification 4.18.6.

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TABLE 1 "A" OTSG TUBE DEFECTS

(>40% Throughwall Indications)

R0W-TUBE LOCATION  % THROUGl4 WALL DISPOSITION 21-55 UTSF + (1) 43 Sleeved 64-11 UTSF + 44 Sleeved 66-24 UTSF + 40 Sleeved 107-13 UTSF + 43 Sleeved 109-12 UTSF + 56 Sleeved 114-107 UTSF + 58 Sleeved 117-10 UTSF + 46 Sleeved 125-71 .UTSF + 63 Sleeved (1) UTSF + = Above the Upper Tube Sheet Secondary Face.

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TABLE 2 "B" 0TSG TUBE DEFECTS

(>40% Throughwall Indications)

R0W-TUBE LOCATION  % THROUGHWALL DISPOSITION 79-21 UTSF + (1) 50 Plugged 121-3 15 (2) 47 Plugged 128-17 UTSF + 60 Plugged (1) UTSF + = Above the Upper Tube Sheet Secondary Face.

(2) Designation for defect at a tube support plate, in this this case the 15th tube support plate.

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TABLE 3 L ~

.u "A" OTSG DEGRADED TUBES

(>20% Throughwall But <40% Throughwall Indications)

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R0W-TUBE LOCATION  % THROUGHWALL DISPOSITION (if any) 5-20 7 (1) 20 s 8-27 3+ 33 10-31 UTSF + (2) 37 Sleeved f .;.

10-39 UTSF + 37 Sleeved -

11-25 UTSF + 34 Sleeved 4

12-69 11 28 ,

13-24 UTSF + 20 ,

13-31 UTSF + 35 Sleeved 26-55 UTSF + 26 31-13 UTSF + 34 Sleeved 31-50 1 23 '-

32-56 UTSF + 29 '

! 38-10 UTSF + 24 l 38-13 UTSF + 34 Sleeved

(- 39-13 UTSF + 34 Sleeved l ..43-106 UTSF + 30 f-44-118 UTSF + 32 Sleeved 1

! 45-26 UTSF + 37 Sleeved 45-57 UTSF + 23 i 48-60 13 + 28 51-20 UTSF + 20 i

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TABLE 3 (continued)

"A" 0TSG DEGRADED TUBES

(>20% Throughwall But <40% Throughwall Indications) 56-2 UTSF + 25 57-29 UTSF + 26

,'-' 59-19 UTSF + 24 61-17 UTSF + 34 Sleeved 61-117 UTSF + 34 Sleeved 65-11 UTSF + 20 65-31 UTSF + 29 65-61 UTSF + 20 68-59 UTSF + 22 68-63 UTSF + 25 69-8 UTSF + 20 69-9 UTSF + 30 69-13 UTSF + 35 Sleeved 70-13 UTSF + 21 70-58 UTSF + 36 Sleeved 70-60 UTSF + 23 70-66 UTSF + 28 71-59 UTSF + 22 71-61 UTSF + 31 Sleeved 72-7 UTSF + 29 72-16 UTSF + 24 72-16 UTSF + 24 72-34 UTSF + 35 Sleeved 74-85 UTSF + 31 Sleeved 6

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J TABLE,3 (continued) i lA" 0TSG DEGRADED TUBES

(>20% Throughwall But <40% Throughwall Indications) 75-14 UTSF + 38 Sleeved 75-14 UTSF + 35 81-8 UTSF + 23 81-14 UTSF + 24 81-52 UTSF + 33 Sleeved 81-53 UTSF + 25 81-65 UTSF + 33 Sleeved 82-7 UTSF + 32 Sleeved 82-7 UTSF + 20 82-19 UTSF + 27 82-27 UTSF + 22 82-59 UTSF + 30 82-61 UTSF + 26 82-62 UTSF + 38 Sleeved 83-5 UTSF + 29 84-11 UTSF + 22 2

87-13 UTSF + 32 Sleeved 88-61 UTSF + 27 89-4 UTSF + 30 Sleeved 89-7 UTSF + 24 90-6 UTSF + 38 Sleeved 90-9 UTSF + 32 Sleeved 93-48 UTSF + 34 Sleeved 97-4 -UTSF + 22 i

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m TABLE 3 (continued)

"A" OTSG DEGRADED TUBES

.(>20% Throughwall But <40% Throughwall Indications) 102-4 UTSF + 35 Sleeved 102-95 14 24 104-2 UTSF + 31 104-15 UTSF + 31 118-106 UTSF + 30 Sleeved 120-93 UTSF + 29 125-69 UTSF + 30 Sleeved 131-4 UTSF + 35 Sleeved 138-24 UTSF + 33 Sleeved 138-50 UTSF + 25 143-44 UTSF + 38 Sleeved 144-26 UTSF + 28 149-13 UTSF + 20 149-34 2+ 38 Plug 7ed (1) Designation for defect at or above (+) a tube support plate, in this case at the seventh tube support plate.

(2) UTSF + = Above the Upper Tube Seccondary Face.

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e TABLE 4' "B" OTSG DEGRADED TUBES

(>20% Throughwall But <40% Throughwall Indications)

R0W-TUBE LOCATION  % THROUGHWALL DISPOSITION (if any) 45-3 UTSF + (1) 21 69-10 UTSF + 28 72-20 UTSF + 25 77-8 UTSF + 26 79-26 UTSF + 30 80-111 2 - (2) 22 82-6 UTSF + 21 83-15 UTSF + 39 Plugged 85-23 UTSF + 33 86-2 UTSF + 30 86-3 UTSF + 25 4

87-24 UTSF + 32 91-2 UTSF + 21

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l (1) UTSF + = Above the Upper Tube Sheet Secondary Face.

! (2) Designation for defect at or above (+) or below (-) a tube support plate, in this case the second tube support plate.

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Lic::nsing R quirem:nt:

ANO-1 T.S. 4.18.6 ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK, ARKANSAS 72203 (501)371-4000 February 4, 1987 1CAN028703 U.S. Nuclear Regulatory Commission (NRC)

Document Control Desk Washington, D.C. 20555

SUBJECT:

Arkansas Nuclear One - Unit 1 Docket No. 50-313 License No. DPR-51 Inservice Inspection of Steam Generator Tubes 1R7 Gentlemen:

In accordance with Arkansas Nuclear One-Unit 1 (ANO-1) Technical Speci-fications 4.18.6, attached is a report of the results of the once through steam generator (OTSG) tubing inspections conducted during the recent refueling outage.

Very truly yours, iLL 0 b  % JL h J. Ted Enos, hanager Nuclear Engineecing and Licensing JTE:MGB:lw Attachment i

! cc: Regional Administrator Region IV l U.S. NRC 611 Ryan Plaza Drive Suite 1000 Arlington, TX 76011 Resident Inspector Arkansas Nuclear One Russellville, Arkansas l

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