ML19343B104
| ML19343B104 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/21/1975 |
| From: | Autio H, Janet Staub YANKEE ATOMIC ELECTRIC CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-50-29-75-10, NUDOCS 8012040318 | |
| Download: ML19343B104 (4) | |
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YAHi{EE ATOUIC ELECTRIC CCUPAllY
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,YAKiKEE November 21, 1975 i
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ll Mr. J. P. O'Reilly, Director C
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Subject:
Reportable Occurrence 50-29/75-10 Abnormal Degradation of No. 1 6 4 i,
Steam Generator Tubes
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Dear Mr. O'Reilly:
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s In accordance with Technical Specifications, Section E.2.a., the
'N attached Licensee Event Report is hereby submitted.
Very truly yours,
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- - 5s Herbert A. Autio v
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H Plant Superintendent b'[f'f ' ' m
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Director, Office of Inspection and EnforcementN U.S. Nuclear Regulatory Conmission Washington, D.C. 20555 (3)
Director, Office of Management Information 5 Program Control U.S. Nuclear Regulatory Comission Washington, D.C.
20555 80120+o 3/f g
g UCENSEE EVENT REPORTg.
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[PLEASE PRINT ALL REQUIRED INFORMATioN)
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@ l "J A lY l K l Rl 1l l0 l 0l-l 0 l 0 l 0l 0l 0l-l0 l0 l l 4 l 1 l1 l1 l1l l0l1l 7 89 14 15 25 26 30 31 32 REDO 4T REPORT CATEGORY TYPE SOUACE DOOKET NUMBER EVENT OATE REPOAT OATE o s CON T l l
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7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCR;PTION lDring refueling operations a scheduled Eddy Current Exa'mination of the No. 1 and 4 l
3; 7 89 33 cts l Steam Generator tubes was perfomed.
Steam generator tube indications in excess of tng 7 8S lacceptancelinitsofReq. Guide 1.S3, June 1974,werefoundinbothNo.1and4steamj e
op 7 6o ois I cenerator. Pursuant to the requirements of Technical Specifications, Section E.2.a. ($$,
7 6S R l abnomal degradation discovered in reactor coolant pressure boundary is reported (confjd) 7 89 pnvE 80 Evs?fu CAUSE COMPONENT COMPONENT g i f'Cl [l i l y' WTPlH l
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d 7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION
[5jy l Decradation of the 304 S.S., 0.75 inch 0.D. Steam Generator tubes with an average wall l 7 ss so ca l:hickness of 0.072 inches has been noted in definite problem areas between the tube
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7 85 80 fiiS l sheet and 4 inches above the tube sheet over the 15 years of plant operation.
(cont'd1 FAO.!TY METHOD OF
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% CO'.*.EA OTHER STATUS 0:SCOVEAY 0 S00VERY DESCR:PTrON 1p l Hl l0l0l0l l NA l y l Eddy Current Examination l
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10 12 13 44 45 46 80 sc v CF EE E CF AMOUNT OF ACTMTY LOCAT:ON OF RELEASE ilE l
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10 11 44 45 80 l
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- SONNEL EXPOSURES
' ' YEEA TYPE CESOAPTtON in l Ol 0l 0l l2l l NA l
7 85 11 12 13 80 PE:SONNEL INJUA:ES
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7 85 11 - 12 80 c.:FS:TE CONSEOUENCES insj i X; I
7 85 80 LOSS OR DAMAGE TO FACIUTY d:E CE50A#TICN 8 111 l
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7 63 10 Bo PUEL'O;TY 117 l
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7 65 80 ACO.TCNAL FACTORS liIll l Cause Description (cont'd) This degradation is suspected to have resulted from the usej 7 89 EO l of phosphate chemistry control in the early years of operation.
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' Ev.cnt Description (cont'd) as Reportable Occurrence 50-029/75-10.
The inspection results were:
(R.G.1.83, Pos. C.4.a.)
(R. G.1. 83, Pos. C. 5.a. )
(R.G.1.83, Pos. C.S.b) 3% of Tubes (50)
Additional 3% of Additional 3% of inspected Tubes (50) inspected Tubes (50) inspected S.G.#1 - 2 Tubes > plugging limit (50%)
1 Tube > plugged limit (50%)
2 Tubes > plugging limit (5s 1 b be > 20%
2 Tubes > 20%
0 'Ibbes- > 20%
'S.G.#4 - 0 Tubes > plugging limit (50%) 2 Tubes > plugging limit (50%)3 'Ibbes > plugging limit (50 2 Tubes > 20%
4 Tubes > 20%
1 Tube > 20%
The tubes that exceeded the plugging limit were explosively plugged.
In addition, Yankee administrative 1y plugged 3 tubes having indications in excess of 40%.
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NRChSTRIBUTION FOR PART 50 DOCK M ATERI AL 3.
(TEMPORARY FORM)
CONTROL NO:
13347 FILE: II. CIDE,T REPonT FI8 FROM: Yankee Atoc.ic Elec. Co.
DATE OF DOC DATE REC'D LTR TWX RPT OTHER Rove, Mass. 01367 Ferbert A.
A '" n 11-21-75 11-24-75 XX TO:
ORIG CC OTHER SENT AEC POR VV Z
Mr. J.P. O'Reilly-40 SENT LOCAL PDR XX r
CLASS UNCLASS PROP!NFO INPUT NO CYS REC'D DOCKET NO:
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XXX 40 Sn-2c DESCRIPTION:
Ltr trans the following:
ENCLOSURES:
ticensee Event Report A 0-50-2 75-10 on 11-7-75 re failure of steem generato)j tubes 1 & 4....
(40. cys enel rec'd).
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