ML17328A811
| ML17328A811 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/14/1990 |
| From: | Blind A INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | Davis A NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9012170163 | |
| Download: ML17328A811 (4) | |
Text
ACCELERATED D TRIBUTION DEMONST TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:9012170163 DOC.DATE: 90/12/14 NOTARIZED: NO DOCKET.g FACIL:50-315 Donald C.
Cook Nuclear Power Plant, Unit 1, Indiana 05000315 AUTH.NAME AUTHOR AFFILIATION BLIND,A.A.
(formerly Indiana
& Michigan Ele RECIP.NAME RECIPIENT AFFILIATION DAVIS,A.B.
Document Control Branch (Document Control Desk)
SUBJECT:
Submits steam generator tube plugging rept.Insp of tubes commenced on 901116
& completed on 901201.
DISTRIBUTION CODE:
AOOID COPIES RECEIVED:LTR 3 ENCL 0
SIZE:
TITLE: OR Submittal:
General Distribution NOTES RECIPIENT ID CODE/NAME PD3-1 LA COLBURN,T.
INTERNAL: NRR/DET/ECMB 9H NRR/DOEA/OTSB11 NRR/DST/SELB 8D NRR/DST/SRXB 8E
~B REG FILE 01 EXTERNAL: NRC PDR COPIES LTTR ENCL 1
2 RECIPIENT ID CODE/NAME PD3-1 PD NRR/DET/ESGB NRR/DST 8E2 NRR/DST/SICB 7E NUDOCS-ABSTRACT OGC/HDS1 RES/DSIR/EIB NSIC COPIES LTTR ENCL NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOiVI Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 18 ENCL
t l
ry
~
Indiana Michlga~
Power Company ~
Cook Nuclear Plant P.O. Box 458 Bridgman, Ml 49106 616 465 5901 Donald C.
Cook Nuclear Plant Unit 1 Docket No. 50-315 License No.
DPR-58 STEAM GENERATOR TUBE PLUGGING REPORT U.S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C.
20555 Attn:
A. B. Davis December 14, 1990
Dear Mr. Davis:
Pursuant to the requirements of Donald C.
Cook Nuclear Power Plant"'Technical Specification 4.4.5.5(a), this letter is to inform you of the number of steam generator tubes plugged as a result of eddy current examination activities performed during the 1990 Unit 1 Refueling Outage.
Inspection of Unit 1 steam generators began on November 16,
- 1990, was completed on December 1,
- 1990, and included 100 percent of all previously nonplugged tubes.
The total number of tubes examined in each steam generator included 3,208 in SG-11, 3,240 in SG-12, 3,246 in SG-13, and 3,221 in SG-14
'onservative steam generator tube plugging criteria, similar to that utilized during the inspection of April-May 1989, were implemented as follows:
In the hot leg tubesheet crevice and tubesheet surface regions (up to approximately 6
inches) all clean indications or other signals representing possible tube wall degradation, regardless of voltage or phase
- angle, were plugged.
At hot leg support plate intersections clear indications meeting a threshold voltage of 1.75 volts and having indicated through wall penetrations of a 40 percent were considered pluggable.
90i2170i63 goi2i43i FDR ADOCK OSOOO gy-Q
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1 Steam Generator Tube Plugging Report December 14, 1990 Page 2 of 2 Applying the conservative evaluation criteria resulted in plugging a total of 170 tubes.
The number of tubes plugged per steam generator were 64 tubes in SG-11, 18 tubes in SG-12, 57 tubes in SG-13, and 31 tubes in SG-14.
Of the total number of tubes plugged 19 were plugged based on Technical Specification requirements (z 40 percent tube wall degradation) and included 5 tubes in SG-11, 8 tubes in SG-12, 5 tubes in SG-13, and 1 tube in SG-14.
Respectfully,
~
~
~
A. A. Blind Plant Manager
/cbm c:
D. H. Williams, Jr.
R.
C. Callen G. Charnoff T. E. Murley NRC Resident Inspector Bridgman NFEM Section Chief