ML18142B883
| 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) | |
Text
NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORiVI)
CO!!T!!OL NO: +
Fl E; INCID:"'.:T ."."-PC".,T FX F ROM: Rao= hes ter Gas 6 Elec. C DATE OF DOC DATE R EC'D LTR TWX RPT OTHER Rochester, N.Yo L D W TO: ORIG GC OTHER SENT AEC PDR James P, O'Reilly NOSE SENT LOCAL PDR CLASS UNC LASS PROP INFO INPUT NO CYS REC'D DOCKET NO:
XXX 50-244 DESCRIPTION: ENCLOSURES:
Ltr. trans the following..... Abnor. Occurr. 8 75-07 an 3-24-75, concern ing Steam, Generator tubes wall thining 0 ~ ~
( 40 cys..encl, rec'd)'.
filiQl PLANT MARIE: RE Ginna 81 FOR ACTION/INFOR!AVIATION VCR 4-11-75 BUTLER (L) SCH(VENCER (L) Zl EMANiV (L) REGAN (E)
W/ Copies W/ Copies W/ Copies IV/ Copies CLARK (L) STOLZ (L) DICKER (E) LEAR (L) w/ r'.ri pie s W/ Copies W/ Cooies W/ Conies PARR ll 1 VARSA I I O (L) KNI6HTON! (E) SPELS W/ Conies 1V/ Copies W/ Copies W/ Copies KNIEL (L) ~RPLE (L) YOUNGBLOOD (E)
W/ Copies .W/ Copies W/ Copies W/ Copies INTERiNAL DISTR I BUTION TECII REVIE';V DE i~lTO!U LIC ASST A/T IND RC PDR -
~SCHROEDER ~G R IMiES R. DIGGS (L) '.BRAITiViAN OGC, ROOi'~l P-506A MACCARY GAMMILL H. (L)
'EARIN SA LTZi'1AN GOSSICK/STAF F KNIGHT KASTNER ~ "E. O'OULBOURNE ME LTZ
~CASE PAWLICKI BALLARD P. (E) (L)'REUTZER 6 I AMBUSSO SHAO SPANGLER J. LFE (L) PLANS BOYD .'"~ STE LLO M. MAIGRET (L) MCDOiUALD MOOR E (L)::+<<HOUSTOiU E NVI RO S. REED (E) CHAPMAiU DEYOUNG (L) '""-~NOVAK MULLER M. SERVICE (I ) :DUBE (Ltr)
SKOVI-IOLT (L) <<ROSS DICKER Sl-I E PPAR D (L) E. COUP":
GOLLER (L) (Ltr) KNIGHTOiV SLATER (E) PETE RSOi~l
-" . ~ TEDESCO IPPOLITO M.
P; COLLliUS YOUiNG BLOOD H. Si!1ITH (L) HARTFIELO (2)
DENISE LONG REGAN S. TEETS (L) <<KLECKER REG OPR LAINAS PROJECT LDR G. WILLIAMS(E) EISENHU Y. WILSON (L) ' WIGG I NTOU
- DEFILE & REGION (2) . BENAROYA
, ~T.R. WILSON(3) <<VOLLMER HAR LESS R. INGRA'i%1 (L) m F. V'ILLX."IS STEELE ~ ff EXTERN DISTRIBUTION a
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~1 TIC (ASERNATH ) (1)(2)(10) i ATIONAL LABS 1 BROOKHA~'Ei~i 'AT LAB
~1 NSIC (BUCHAiUAfl) 1 W. PEiNiUliNGTO!U, Rm E.201 GT 1 1 ASLB 1 CONSULTANTS 1 G. ULR IKSOi I. Oi:
1 Newton Anderson NEWi>)ARK/BLUME/AGBABIAN 1 AGiVIED (RUTH GUSSY!AN
~w- ACRS S::.t TG LXC SST Rm 8-127 GT 1 J. D. RUiVKLES, Rm E-201 GT
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'L roar 4 1 A'Ie ROCHESTER GAS AND ELECTRlC CORPORATIOH o 89 EAST AVENUE, ROCHESTER, M.Y. 14649 LEON D. VA<ITE. JR. Q TeLepHONe vlcc pRenlneNT *me~ cone 7ic 546.2700 0 cQ Q~q p April 7, 1975
~~+ w~
coM"k~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 Jog During eddy current inspection of Steam Generator (SG) tubes results showed 10 "A" SG 7 8 9 80 hot leg tubes and 12 "8" SG hot leg tubes with wall thinning of 50% or reater. Tube 7 8 9 80 t00j4 thinning in the "A" SG was previously reported, AOR 74-02, on 2/19/74 with a follow-7 8 80 Jog up report on 3/21/74. The above tubes are to be plugged. (Abnormal Occurrence 7 8 80 Jog 50-244/75-07) 7 8 9 PF4VIE 80 ~
SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPUER MANUFACTURER VIOIATION
~07 ~CI 8 9 10 B H T B 7I C H ~N W 1 2 0 N 7 11 12 17 43 44 47 48 CAUSE DESCRIPTION IOOI Local corrosion of tube OD surface is believed to have been caused by phosphate
.7 8 9 80 Jog residue not removed on change to AVT chem. control. SG descri tive data and 7 8 9 Qio] measures to prevent recurrence are on attached page.
7 8 9 80 FACIUTY METHOO OF OTHER STATUS OISCOVERY OISCOVERY OESCRIPTION G ~00 0 N/A C 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 DESCRIPTION
~00 0 B -
N A 7 8 9 11 12 13 80 PERSONNEL INJURIES 7 8 9 11 12 80 OFFSITE CONSEQUENCES N/A 7 89 80 LOSS OR DAMAGE TO FACILITY 7 89 10 PUBLICITY i N/A
.7 89 80 ADDITIONAL FACTORS
+18 Shell side sludge removal was done 3/74 and 11/74. An AVT S.G. chem. control 7 89 80 Q~g] 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 6/54 6-2 700, ext . 2420 GPO 88I 667
Licensee Event Rei ~rt 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 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 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.