ML20095J262
| ML20095J262 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 12/22/1995 |
| From: | Wozniak D COMMONWEALTH EDISON CO. |
| To: | NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| BYRON-95-5174, NUDOCS 9512270028 | |
| Download: ML20095J262 (3) | |
Text
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Commonwrahh filiwn Company li)ron Generating Station
'l 650 North Gernun Chun h F"ul
- 3) run, ll. 61010 9') i Tel8154.tiSint December 22,1995 l
LTR:
BYRON-95-5174 FILE:
3.11.0530 d
Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555 1
ATTENTION: Dooument Control Desk SU; JECT:
Byron Station Unit 1, Steam Generator Tube Repairs During Byron 1 Planned Outage (B1P02) l REFEPFNCE:
LER 454: 95-011 1
l This letter is to inform the staff of steam generator tubes repaired durinn the B1P02 inspection conducted between November and December of 1995. Rept e i conditions are defined as tubes either requiring inconel-690 mechanical or wel.
plugs and Inconel-690 laser welded sleeves. This information is being reported pursuant to operating License NPF-37, Appendix A, Technical Specification 3/4.4.5.a.
All tubes in each steam generator were inspected from the hot leg tube end to the cold leg tube end for the bobbin eddy current inspection. Also, each tube was I
inspected utilizing the plus point technology at the top of the tubesheet. Based on the results of the:,e inspections, it v.as determined that each steam generator would be classified as C-3 category pursuant to Technical Specification 4.4.5.2. Byron Station LER 454.95-011 addresses the C-3 category for each steam generator. Specific details j
of the inspection are forthcoming in the 90 day Steam Cenerator Tube Inservice Inspection Report pursuant to Technical Specification 4.4.5.5.b.
As a result of the inspections, a total of 2,812 tubes have been repaired during the B1P02 outage. Repairs were completed on December 18,1995. The tube repair distribution for each steam generator is provided in the attached Table 1.
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'If there are any additional questions, please contact Mr. Joe Lonigro at (815) 234 5441, extension 2166.
David B. Wozniak Q
Site Engineering Manager Byron Nuclear Power Station DBW/JKL/cb Attachment cc:
H. J. Miller, NRC Regional Administrator - RHI G. F. Dick, Jr., Byron Project Manager - NRR H. Peterson, Senior Resident inspector, Byron L. F. Miller, Jr., Reactor Projects Chief - Rill Office of Nuclear Safety LNS K. Kofron T. Tulon K. Passmore J. Blomgren M. Lesniak D. Saccomando L.Zech Site Engineering File 4
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TABLE 1: ALL TUBES REPAIRED DURING B1P02 REASON-t x l 9 SG A cl SSG B - l-SG C. l eSG D tl wTotal :
TUBES PLUGGED Stabilized 207 97 25 236 565
(
Sleeve Configuration (Circumferential Indications) 198 92 25 236 551 i
Cable (Short Extension)(1) 7 0
0 0
7 l
Cable (Long Extension)(2) 2 5
0 0
7 l
Sleeving - Plugged 0
2 2
1 5
l Plugged (Sentinel - HL, Mechanical - CL) 1 0
0 0
1 Plugged (Welded - HL, Mechanical - CL) 8 0
0 0
8 Plugged (Mechanical HL & CL) 93 31 33 30 187 l
TOTAL TUBES PLUGGED DURING B1P02 309 130 60 267 766 I
TUBES SLEEVED Sleeved - Laser Welded Sleeve 0
893 704 449 2046 TOTAL TUBES SLEEVED DURING B1P02 -
0 893 704 449 2046 TOTAL 1U8ES stEPANl$D DtN9lNG'Bt90tkdMpw Av.
TUBES PLUGGED IN PREVIOUS OUTAGES.
458 514 562 218
~ 1752 TOTAL OF ALL TUBES REPAIRED (PRESERVICE TO B1902)
TUBES PLUGGi_D 767 644 622 485 2518 TUBES SLEEVED 0
893 704
~ 449
- 2046 HL - Hot Leg CL - Cold Leg (1) Short Cable stabitzer used for tubes surrounding remnant tubes from removal (24-42 & 14-37) l (2) Long cable stabilizer used for tube remnants in SG A (Welded HL, Mechanical CL) l Long cable stabilizer used for misplaced welds in SG B (2045,21-85,2345,23-85 & 2346)
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