ML20148G578

Forwards Results of SG ISI Rept,Cycle 6 mid-cycle Outage, for Braidwood Station Unit 1,per NUREG-1276,TS 4.4.5.5.a

ML20148G578
Person / Time
Site:	Braidwood
Issue date:	05/29/1997
From:	Tulon T COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-NUREG-1276 NUDOCS 9706060019
Download: ML20148G578 (4)

Text

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May 29,1997 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555

Subject:

Braidwood Station Unit 1 Cycle 6 Mid-Cycle Outage Steam Generator Inservice Inspection Report Docket No. STN 50-456

References:

(1) NUREG-1276, Technical Specifications, Braidwood Station, Unit Nos. I and 2 Specification 4.4.5.5.a of reference (1) requires that within 15 days following the completion of each inservice inspection of steam generator tubes, the number of tubes plugged or repaired in each steam generator shall be reported to the Commission in a Special Report pursuant to Specification 6.9.2.

During the Braidwood Unit 1 Cycle 6 Refuel Outage, which began on March 29, 1997, an eddy current inspection of the steam generator tubing was conducted. The inspection consisted of the following:

. Bobbin coil probe inspection of 100% of the inservice tubes (fbil length).

. 3-coil rotating Plus Point probe inspection of the hot-leg top-of-tubesheet roll transition region of 100% of the non-sleeved tubes. /j e 3-coil rotating Plus Point probe inspection of the cold-leg top-of-tubesheet roll /

transition region of 100% of the inservice tubes.

e Rotation Plus Point probe inspection of 100% of the Rr,w I and Row 2 U-Bend gf regions.

. 3-Coil rotating Plus Point probe inspection of Tube Support Plate intersections required by Generic Letter 95-05 for the implementation of an Interim Plugging Criteria.

. 3-Coil rotating Plus Point probe inspection of 25% of the tubes expanded at Preheater Baffles "B" and "D" in the IB Steam Generator.

• Plus Point probe inspection of 100% of the 12" Laser Welded Sleeves (full length) installed at the hot-leg top-of-tubesheet roll transition region.

9706060019 970529 5"^ m' @pW(ggy A l'nicom G>mpany

U.S. Nuclear Regulatory Commission

, Document Control Desk May 29,1997 l 3-Coil rotating Plus Point probe inspection of the hot-leg top-of-tubesheet roll transition region of 100% of the Locked Tubes required to support the 3.0 Volt Interim Plugging Criteria.

Rotating Gimballed Plus Point probe inspection of 100% of the expansions at the Locked Tube Support Plate intersections. This inspection also included 100% of the non-locked Tube Support Plate intersections below the highest Locked Tube Support Plate.

The 3-Coil rotating Plus Point probe consisted of the Plus Point coil, a 0.080 inch Pancake coil, and a 0.115 inch Pancake coil. The eddy current data was analyzed

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' using the EddyNet software. The inspection was completed on May 16, 1997.

Attachments 1 and 2 summarize the results of this inspection.

Please direct any questions regarding this submittal to Terrence Simpkin, Braidwood Regulatory Assurance Supervisor, (815) 458-2801, extension 2980.

Very truly yours,

/

' u othy J. Tulon tation Manager Braidwood Nuclear Generating Station TIT /697nrc015 doc

. Attachments cc: Senior Resident Inspector - Braidwood Braidwood Project Manager - NRR Regional Administrator - RIII Illinois Department of Nuclear Safety

t Attachment 1 Braidwood Unit 1 Sixth Refuel Outage (A1R06) SG Tube Plugging Results 1 A SG 1B SG 1C SG 1D SG TOTALS Total Tubes 4578 4578 4578 4578 18312 Previously Plugged Tubes 592 424 916 425 2357 Previously Sleeved Tubes (Hot Leg Roll Transition) 181 0 ~ 445 271 897 Total inservice Tubes Inspected 3986 4154 3662 4153 15955 Total Tubes Inspected at Hot Leg Roll Transition 3805 4154 3217 3882 15058 l Locked-Tube Model TSP Pluggable (IPC) 27 7 39 31 104 Free-Span Model TSP Pluggable (IPC) 2 0 0 0 2 l TSP Pluggable Indications Excluded from IPC 14 2 7 9 32 Anti-Vibration Bar Wear Pluggable 0 0 0 0 0 New Tubes Plugged due to TSP Locking to Support the 3.0 Volt IPC 0 0 3 1 4 Cold Leg Top-of-Tubesheet Indications Plugged  ;

Single Circumferential (SCl) 8 6 4 4 22 I Multiple Circumferential (MCl) 5 0 5 1 11 l Volumetric (VOL) 1 1 0 0 2 U-Bend AxialIndications 2 0 0 0 2 U-Send Circumferential Indications 0 1 0 0 1 Volumetric indications at TSP 1 2 0 0 3 1 Admin - LWS Weld Indication 0 0 1 0 1 1 Hot Leg Top-of-Tubesheet Indications Plugged Single Circumferential(SCl) 5 4 5 3 17 Multiple Circumferential (MCl) 0 1 0 0 1 Hot Leg Top-of-Tubesheet Indications Sleeved Single Circumferential (SCI) 49 33 28 102 212 Multiple Circumferential (MCl) 8 1 13 27 49 t

Single Axial (sal) 0 1 0 1 2 l Multiple Axial (mal) 2 0 0 1 3 Mixed Mode Indication (MMI) 0 1 0 0 1 Volumetric (VOL) 0 2 0 0 2 Locked Tubes Unplugged / Sleeved /Replugged 21 21 22 21 85 Tubes Unplugged /Replugged 1 CL only 2 4 0 7 A1R06 Total Tubes Plugged 65 24 64 49 202 A1R06 Total Tubes Sleeved 59 38 41 131 269 Previously Sleeved Tubes Now Plugged 4 0 9 7 20 i Restart Total Tubes Available 3921 4130 3598 4104 15753 i Total Tubes Plugged 657 448 980 474 2559 Total inservice Tubes Sleeved 236 38 477 395 1146 Total Equivalent Plugged 670.7 450.2 1007.7 497.0 2625.6 Percentage of Tubes Plugged 14.7 % 9.8% 22.0 % 10.9% 14.3 %

5 SG Tube Plugging Limits are a maximum of 30% in any orie SG with a maximum of 24% total.

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, . Attachment 2 Braidwood Unit 1 SG Tube Plugging History

% AVB f ree- ISP ODSCC HL lop of-Tubesheet CL TIS Pluo Sleeve Plugged Wear Span TSP!IPC E n ci lPC Circ A ximi M ned VOl Carc VOL OTHFR (PSI) SG-A 4 0 09 1-Foctory 3 Basei.no (PSO SG-8 1 0 02 1 Factory fPSil SG-C 8 0 17 8-Basehne rPSO SG-D 1 O O? 1 -Basehne i A1 HOI) SG- A 6 0 20 2 l 3-Fonegn Object (A1RO11 SG 8 1 O 04 1 1 1A1ROllSG-C O O17 i A1 HO1) GG-D 0 0 02 1.102 EFPY (A1HO2) SG- A 11 0 44 2 B 1 Forison Obrect (A1F402) SG-0 2 O 09 1 1 NRC Bulletin 88-02 (A1RO2) SG-C 19 0 59 1 18

( A1 RO2) SG-D 4 0 11 4 0 861 IFPY (A1HO3) SG-A 37 1.25 4 33 ,

(A1RO3) SG-B 11 0 33 11 1 (AIRO3) SG-C 82 2.38 2 80 r AI RO3) SG-D 44 1 07 44 1 132 EFPY

( A1 F 26) SG-C l 117 l l 4 94 l l 1 l 116 l l l l l l l l 0 852 EFPY Oct- 9 3 t ( A 1 HO4 ) SG- A 186 5 31 1 2 170 13 f (A1 RO4) SG-8 43 1 27 4 19 0 20 TSP E spansion Prens FA1F404) SG-C 140 7 99 5 127 8 i

(AIRO4) SG-D 122 3.74 1 110 11 1.1468 EFPY NOTE In RO4 a 1 O Volt IPC wee annroved for ODSCC l

l (A1MO5) SG-A 262 11.03 2 235 17 4 1 1 2 l (A1MOS) SG-B 44 2 23 41 2 1 l (A1MOS) SG-C 340 15 42 1 315 12 11 1 iA1 MOS) SG D 194 7 97 180 13 1 j 07142 IFPY NO1E The 15 Cercumfeeent at Crocks + the 1 MMI were 'stanskred' with a sleeve 2 Loose Parts.

iA1 RO5) SG- A 44 11 99 1 1 10 8 1 21 Expanded Tubes (A1HO5) SG-B 26 2 80 2 2 1 21 E mpanded Tubes 1 TSP VOL, 2 DNTs.

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( A1 RO5) SG-C 37 16 23 1 1 8 1 1 22 Espanded Tubes l i

l  ; A1 FtO5) SG-D 32 8 67 3 5 3 21 Expanded lubes O 508 (FPY NOTE 3 0 Voit IPC approved for A1ROS outace IA1PO2) SG A 43 181 13 16 221 1 2 1 4 tubes vinth a cire and anal indication, (A1PO2) SG B 296 0 9 26 276 20 3 was piuoced 1 tube 1 lube with a circ and ex al

!A1 PO2) SG-C 173 445 20 57 610 3 6 ind. cation 5 tubes with a circ and ax.ai (A1PO21 SG-D 28 271 9 63 293 8 3 and. cation O 744 EfPY NOl f - T op-oi-l obeshoot inspect.on only 2 UBend Axials.

I (A1F406) SG- A 65 59 14 65 0 29 14 62 2 O O 13 1 1 VOL et T SP 1 UBend Circ,

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(A1R06) SG-B 24 38 9 83 0 7 2 39 1 1 2 6 1 2 VOL at TSP i 3 New Locked Tubes.

( A1 R06) SG-C 64 41 22 01 0 39 7 46 0 0 0 9 0 1 Aamin 1 WS (AIRO61 SG-D 49 131 10 86 0 31 9 132 2 O O 5 0 1 New t ocked lobe O 291 EFPY NOT F tWS instaliert in a locked Tubes ftocked Tubes replugged)

Total Tubes Plugged 2559 Total Tubes Sie ved 1146 Total Equevalent Plugs 2625 6

% Tubes Plug 9ed 14.34 Total EFPY 6 557