ML18142B882

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LER 1975-007-00 for R. E. Ginna, Abnormal Degradation of Steam Generator Tubes
ML18142B882
Person / Time
Site: Ginna Constellation icon.png
Issue date: 04/17/1975
From: White L
Rochester Gas & Electric Corp
To: O'Reilly J
NRC/IE, NRC Region 1
References
LER 1975-007-00
Download: ML18142B882 (7)


Text

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NR STRIBUTION FOR PART 50 DOCK MATERIAL (TEMPORARY FORM)

CONTROL NO:

FI LE. INCIDENT REPORTs 'FIL'E' ROM: Rochester Gas 6, El.ec. Co DATE OF DOC DATE REC'D LTR TWX RPT OTHER Roches ter, No Y, 4-7>>75 4-16-75 TO: ORIG CC OTHER SENT AEC PDR James P. O'Rbilly 1sSigned SENT LOCAL PDR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO XX DESCRIPTION: ENCLOSURES:

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ROCHESTER GAS AND ELECTRIC CORPORATION o 89 EAST AVENUE, ROCHESTER, LEON O. WHITE, JR. TELEPHONE VICE PRE8IDENT AREA CODE Tld 546-2700 April 7, 1975 cpQ

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Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission ij "V- EQ j>> /

Office of Inspection and Enforcement Region I ~s'6oo gsu g(o8c (- )(jpCP'"

DosLoI 631 Park Avenue King of Prussia, Pennsylvania 19406

Subject:

Abnormal Occurrence 75-07, Abnormal degradation of steam Generator Tubes R. E. Ginna Nuclear Power Plant, Unit No. 1 Docket No. 50-244

Dear Mr. O'Reilly:

In accordance with Technical Specifications, Article 6. 6.2a, the attached report of Abnormal Occurrence 75-07 is hereby submitted. Two additional copies of this letter and the attachment are enclosed. '

more detailed report is being prepared and a copy will be forwarded upon completion.

Very truly yours, r ~

L. D. Whi, Jr.

Attachment cc: Mr. Donald F. Knuth (40)

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LICENSEE EVENT REPORT CONTROL BLOCK: (PLEASE PRINT ALL REQUIRED INFDRMATIDN) 1 UCEN SEE UCENSE EVENT NAME LICENSE NUMBER TYPE TYPE

[oaj N Y R 2 GI 0 0 0 0 0 0 0 0 0 4 I 1 I I ~01 7 89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY TYPE SOURCE OOCKET NUMBER EVENT OATE REPORT OATE

[on~]coo7 ~MI T L. 0 5 0 0 2 4 4 3 2 4 7 5 0 4 0 7 7 5 7 8 57 58 59 60 61 68 69 74 75 80 I

EVENT DESCRIPTION

[oO~] During eddy current ins pection of Steam Generator (SG) tubes results. showed 10 "A" SG 7 8 9 80 hot leg tubes and 12 "B" SG hot leg tubes with wall thinning of 50% or reater Tube ~

7 8'9 80 Qp~] thinning in the "A" SG was previously reported, AQR 74-02, on 2/19/74 with a follow-7 8 9 80 Qpg up report on 3/21/74. The above tubes are to be plugged. (Abnormal Occurrence 7 8 9 80 Qpg 50 244/75 07) 7 8 9 PRME 80 SYSTEM CAUSE COMPONENT COBE CODE COMPONENT COOE SUPPLER MANUFACTURER VCIATION

~CI B H T B X C H ~N W 1 2 0 ~N 7 8 9 10 11 12 17 43 44 x 47 48 CAUSE DESCRIPTION

[ops] Local corrosion of tube QD surface is believed to have been caused by phosphate 7 8 9 80

[oO~] residue not removed on change to AVT chem. control. SG descri tive data and 7 8 9 80

~10 measures to prevent recurrence are on attached page.

7 89 FACIUTY METHOO OF 80 STATUS POWER OTHER STATUS DISCOVERY OISCOVERY OESCRIPTION Pig a ~00 0 N/A eddy current test of tubes 7 8 9 10 12 13 44 45 46 80 FORM OF AMOUNT OF ACTIVITY LOCATION OF RELEASE N/A 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE OESCRIPTION Pg~oo 7 89 o B 12 13 NA 11 80 PERSONNEL INJURIES NUMBER OESCRIPTION

(+4 ~0o o N/A 7 89 11 12 80 OFFSITE CONSEQUENCES N/A 7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE OESCRIPTION P N/A 7 89 10 80 PUBLICITY 7 89 80 ADDITIONAL FACTORS

~18 Shell side sludge removal was done 3/74 and ll/74. An AVT S. G. chem. control 7 89 80

~19 program, was started ll/74 and adherence to this has been good to date.

7 89 80 NAME: L. D. White, Jr. PHDNE, 7 1 6/546-2700, ext. 2420 GPO 861 667

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Licensee Event Report 2.

50-244/75-07 Steam Generator Descri tive Data:

The steam generators are Westinghouse series 44, using Inconel series 600 tubes, size 0. 875" OD, with . 050" walls.

Measures to Prevent Recurrence:

a. The shell side of the tube sheets will be cleaned using a high pressure water lance against attack which may be due to any remaining phosphates or caustics contained in sludge.
b. For further information on the tube degradation mechanism, at least two

<ub~-.tube-ends are to be extracted from the steam generators.

c. A series of mechanical modifications is being considered to decrease the area of the tube sheet which is susceptible to low flow conditions and s ludge buildup.
d. A high blowdown rate during varying steam generator conditions will be continued to minimize dissolved and suspended solids, consistent with recommended all volatile treatment (AVT) steam generator chemistry control.
e. In the event that sludge accumulation continues to be observed in future shutdowns, additional lancings may be considered to lower residual phosphate levels in the steam generators.

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