05000244/LER-2075-007, For R. E. Ginna, Abnormal Degradation of Steam Generator Tubes

For R. E. Ginna, Abnormal Degradation of Steam Generator Tubes

ML18142B883
Person / Time
Site:	Ginna
Issue date:	04/07/1975
From:	White L Rochester Gas & Electric Corp
To:	O'Reilly J NRC/IE, NRC Region 1
References
LER 1975-007-00
Download: ML18142B883 (5)

LER-2075-007, For R. E. Ginna, Abnormal Degradation of Steam Generator Tubes

Event date:
Report date:
2442075007R00 - NRC Website

text

NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORiVI)

CO!!T!!OLNO:+

Fl E; INCID:"'.:T."."-PC".,T FX F ROM:

Rao= hes ter Gas 6 Elec.

C Rochester, N.Yo L D TO:

James P, O'Reilly DATE OF DOC W

ORIG NOSE TWX RPT GC OTHER SENT AEC PDR SENT LOCAL PDR DATE R EC'D LTR OTHER CLASS UNCLASS XXX PROP INFO INPUT NO CYS REC'D DOCKET NO:

50-244

ENCLOSURES:

Ltr. trans the following.....

PLANT MARIE:

RE Ginna 81 FOR ACTION/INFOR!AVIATION VCR 4-11-75 Abnor. Occurr.

8 75-07 an 3-24-75, concern ing Steam, Generator tubes wall thining 0 ~ ~

( 40 cys..encl, rec'd)'.

filiQl BUTLER (L)

W/ Copies CLARK (L) w/ r'.ri pie s PARR ll 1 W/ Conies KNIEL (L)

W/ Copies SCH(VENCER (L)

W/ Copies STOLZ (L)

W/ Copies VARSAI I O (L) 1V/ Copies

~RPLE (L)

.W/ Copies ZlEMANiV(L)

W/ Copies DICKER (E)

W/ Cooies KNI6HTON! (E)

W/ Copies YOUNGBLOOD (E)

W/ Copies REGAN (E)

IV/ Copies LEAR (L)

W/ Conies SPELS W/ Copies W/ Copies TECII REVIE';V RC PDR

~SCHROEDER OGC, ROOi'~l P-506A MACCARY GOSSICK/STAF F KNIGHT

~CASE PAWLICKI 6 IAMBUSSO SHAO BOYD

.'"~ STE LLO MOOR E (L)::+<<HOUSTOiU DEYOUNG (L)

'""-~NOVAK SKOVI-IOLT(L)

<<ROSS GOLLER (L) (Ltr)

~ IPPOLITO P; COLLliUS TEDESCO DENISE LONG REG OPR LAINAS

- DEFILE & REGION (2)

BENAROYA

, ~T.R. WILSON(3)

<<VOLLMER STEELE INTERiNALDISTR IBUTION A/T IND

'.BRAITiViAN SA LTZi'1AN MELTZ LIC ASST DIGGS (L)

'EARIN (L)

O'OULBOURNE (L)'REUTZER (E)

LFE (L)

MAIGRET (L)

REED (E)

SERVICE (I )

Sl-I E PPAR D (L)

SLATER (E)

Si!1ITH (L)

TEETS (L)

WILLIAMS(E)

WILSON (L)

INGRA'i%1 (L) '

DE i~lTO!U

~G R IMiES GAMMILL KASTNER BALLARD SPANGLER R.

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PLANS MCDOiUALD CHAPMAiU

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E. COUP":

PETE RSOi~l HARTFIELO (2)

<<KLECKER EISENHU WIGG I NTOU m F. V'ILLX."IS E NVIRO MULLER DICKER KNIGHTOiV YOUiNGBLOOD REGAN PROJECT LDR HAR LESS

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EXTERN DISTRIBUTION

~1 LOG~~ PDR r

~1 TIC (ASERNATH

)

(1)(2)(10) i ATIONALLABS

~1 NSIC (BUCHAiUAfl) 1 W. PEiNiUliNGTO!U, Rm E.201 GT 1 ASLB 1

CONSULTANTS 1 Newton Anderson NEWi>)ARK/BLUME/AGBABIAN

~w-ACRS S::.t TG LXC SST 1 P DR-SAN/LA/IIY 1 BROOKHA~'Ei~i 'AT LAB 1 G. ULRIKSOi I. Oi:

1 AGiVIED (RUTH GUSSY!AN Rm 8-127 GT 1 J. D. RUiVKLES, Rm E-201 GT

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ROCHESTER GAS AND ELECTRlC CORPORATIOH o

Q LEON D. VA<ITE.JR.

vlcc pRenlneNT 0 cQ Q~q p

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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 Jog 7

8I 7

8 t00j4 7

8 Jog 7

8 Jog 7

8

~07 7

8 IOOI

.7 8

Jog 7

8 Qio]

7 8

7 8

7 8

7 8

7 8

up report on 3/21/74.

The above tubes are to be plugged.

(Abnormal Occurrence 50-244/75-07) 9 PF4VIE SYSTEM

CAUSE

COMPONENT CODE CODE COMPONENT CODE SUPPUER VIOIATION

~CI B

H T B

7I C

H

~N W

1 2

0 N

9 10 11 12 17 43 48 CAUSE DESCRIPTION Local corrosion of tube OD surface is believed to have been caused by phosphate COMPONENT MANUFACTURER 44 47 9

residue not removed on change to AVT chem. control.

SG descri tive data and 9 measures to prevent recurrence are on attached page.

80 80 80

~

80 9

FACIUTY G

~00 0

9 10 12 13 FORM OF 9

10 11 PERSONNEL EXPOSURES NUMBER TYPE

DESCRIPTION

~00 0

B N A 9

11 12 13 PERSONNEL INJURIES 9

11 12 OTHER STATUS N/A AMOUNT OF ACTIVITY OFFSITE CONSEQUENCES N/A METHOO OF OISCOVERY OISCOVERY OESCRIPTION C

eddy current test of tubes 44 45 46 44 45 N/A LOCATION OF RELEASE 80 80 80 80 80

EVENT DESCRIPTION

During eddy current inspection of Steam Generator (SG) tubes results showed 10 "A" SG 9

80 hot leg tubes and 12 "8" SG hot leg tubes with wall thinning of 50% or reater.

Tube 9

80 thinning in the "A" SG was previously reported, AOR 74-02, on 2/19/74 with a follow-7 89 LOSS OR DAMAGE TO FACILITY 7

89 10 PUBLICITY i

N/A

.7 89 ADDITIONAL FACTORS

+18 Shell side sludge removal was done 3/74 and 11/74.

An AVT S.G. chem. control 7

89 Q~g]

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

80 80 80 7

89 NAME:

L. D. White, Jr.

80 PHDNE 7 1 6/54 6-2 700, ext

. 2420 GPO 88I 667

Licensee Event Rei ~rt 50-244/75-07 2.

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 willbe 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 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 sludge buildup.

d.

A high blowdown rate during varying steam generator conditions willbe 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.