ML20095J262

Informs NRC of SG Tubes Repaired During B1P02 Insp Conducted Between Nov & Dec 1995

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

._. .

• Commonwrahh filiwn Company li)ron Generating Station l

'l 650 North Gernun Chun h F"ul

, 3) run, ll. 61010 9') i l

Tel8154.tiSint December 22,1995 l

I LTR: BYRON-95-5174 l

FILE: 3.11.0530 '

l 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 l 1

l This letter is to inform the staff of steam generator tubes repaired durinn the I 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 I 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.

l l

As a result of the inspections, a total of 2,812 tubes have been repaired during l 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. ]

l 27C063 L

J pnsec\byritr\95-5174. doc g

~

9512270028 951222 # l A i'nicom u>mpan PDR ADOCK 05000454 i O _ _ . _ PDP, ,

4

'If there are any additional questions, please contact Mr. Joe Lonigro at (815) 234 5441, extension 2166.

David B. Wozniak Site Engineering Manager Q

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 l J. Blomgren M. Lesniak D. Saccomando L.Zech Site Engineering File 4

1 i,

p:\seC\byritr\95-5174. doc

~ - . . . _ - - . ~ . . . . . . - - - - - . - . - - - . . - . - . - - - - - . . - - . . .-. - . - . - . . . . .

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 -

Cable (Long Extension)(2) 2 5 0 0 7  ;

Sleeving - Plugged 0 2 2 1 5 ,

l 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 TOTAL TUBES PLUGGED DURING B1P02 309 130 60 267 766 l

' 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)

Long cable stabilizer used for misplaced welds in SG B (2045,21-85,2345,23-85 & 2346) l Page 1

_ . _ . _ _ _ . _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _e_ _ - _ _m_____ . _ _ _ _ - _ - _ _ _ _ _ _ _ . _ - _- ___