L-75-475, Provide Information Concerning Steam Generator Water Chemistry Conversion & Integrity of Steam Generator Tube Inspection as Requested

Provide Information Concerning Steam Generator Water Chemistry Conversion & Integrity of Steam Generator Tube Inspection as Requested

ML18227D168
Person / Time
Site:	Turkey Point
Issue date:	09/30/1975
From:	Robert E. Uhrig Florida Power & Light Co
To:	Lear G Office of Nuclear Reactor Regulation
References
L-75-475
Download: ML18227D168 (9)

Text

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S FILE' fgOM. Florida Pwr 6 Light Co DA1 E OF DOC DATf= I) EC'D 1wx OTIOSE).

)fiamis Fla R E Uliri 9-30-75 10-9-75 XXX TO: ORIG CC OTHER SEhlf 33RC Pf>R~X Hr Lear one signed SENT LOCAL I'DB CI ASS UNCLASS PROP INf:0 INPUT NO CYS REC'f3 DOCKL= I'O:

XXXXX l, 50-250~3 DESCnlP rlON: ENCLOSURES:

Ltr trans the following: Information concerning Generator Mater Chemistry Control" conversion from. phospha treatment to AVT....(40 c'ys encl: rec'd)

NOTE: DELAY XN DISTRIBUTlON OF THIS.ITElf DUE TO NECESSITY OF HAVING 'TO A'WAIT THE ENCLOSURE TO THE LETTER. ENCLOSURES REt'."D ON 2-2-76.

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P.O. IIOX 3103 lhlhl.II, FLOIIIOA 33101 xi~Iil~/r FLORIDA POISLR 5 LIGHT CO,'APAMV September 30, 1975 L-75-475 Director of Nuclear Reactor Regulation ATTN. Nr>> George Learn Chief OgI.

Operating Reactors Branch No'. 3 U. S. Nuclear Regulatory Commission 0, s

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Ãashington, D. C. 20555 I e ~ski 'C~y

>>>> yg Deax'~ir. Lear s Re~ Xntegrity of Steam Generator Tubes Turkey Point Units 3 and 4 Docket Nos. 50.-250 0 50-251 Turkey Point Units 3 and 4 steam generator >rater chemistry control has been converted from phosphate treatment to AVE.

version seas accomplished in October, 1974, and Unit 4 conversion

'nit 3 con-mao accomplished in August, 1974. Your lettor of September stated that the Nuclear Regulatory ConImission staff is 22'975, particularly interested in the operating experience of such "conversion" plants and, therefore, you requested that. ve provide certain information concerning our, chemiatry conversion and steam generator tube inspections. The follceiing input is proM.dad.

l. Steam Genexator (S/6 Tube Xns ections (ChronoloLTicall )

A>> S/G 4Ai 4D.~ 4C DATE: Fobruary, 1973 REASON: Preservico and Baseline Eddy Current (EC)

Xnspection TUB=S XNSPECTED: 100 percent of the tubes in the inlet sideof each steam generator at a frequency of 400 K!lz up to the first support. Additionally, a nominal l0

>> percent of the inlet..tubes in each generator mere examined at 400 KHz completely around tho U-bend to the top support on the outlet side. See Appendix A to this xapox't for tubesheet plan indicating those tubes examined

<.-,".vq completely around the U-bend.

HI:.LPING 0UILO I'LORIUA

Hx'.,George Lear September 30, 1975 4

DEFECT XNDXCATXONSs "None othe'han minor scxatches on the ins9.de of the tubes and minor local9.zed denting of the tube wall.

A comple'te listing of those tubes exhibiting. the above mentioned indications 9.s given. in AppenQix A.

KUBES PLUGGEDs None B. S/Gs 38 DATE: December, 1973 RBASONs Planned Un9. 3 maintenance outage provideQ opportunity to gather baseline HC.data on one steam generator. Also prov9.Qed opportunity fox assessment. of reg9.ons ~ihere evidence of tube wall deterioration had been detected in the steam generators of other PT7R's installed by'our NSSS vendor. Xn addition, infonaation was to, be obtained fox coxrelation studies, of the prosence of deposits on tube exteriors and on possible low lovel wall thinning in the region immediately above i:he tubesheet.

TUBED XNSPECTEDs See AppendiX 8 for tubesheet plans indicating wh9.ch tubes were 9.nspected.

DEFECT XNDXCATXONSs Disto ted tub sheet signals at 100 and,400 HiIz in the inlet side between rows 10 and 30 suggest shally. tv~e wall tie.nning (<<204~) 9.n the region adjacent to the top of the tubesheet.

The e was no ev9dence of th9nning in any other reg9.on ~ See Appendix 8 for EC data on the pres=nce of s3.udge deposits.

TUBES PLUGGEDs Mone C, S/Gs 4A DATEs January, .1974 HBASONs Planned Unit 4 maintenance outage prov9.ded opportunity to.gather baseline EC data for use in evaluating a new secondaxy chemistry contxol .

program. Also pxoviQed opportunity to. gather information for correlation studies of the presence of deposits on tube exterioxs and on th>>. phenomena of low level tube wall th9.nning.

i

?*?r. george Lear September 30, 1975 TUBES XNSPZCTEDr 61 tubes vere ZC tested at lOOK15s in both the inlet and out3at side up to the first support. See Appendix C for tubesheet-plan indicating srhich tubes vere 9.nspected ~

DLFHCT XNDXCATXO?JS: Distorted tubesheet. signalo at 100 RHz in all 9.nlet tubas exam9.nod suggest shallower tube vali th9nn9.ng

(<<20l").-in the region ad)acent to the top of the tubesheet. There vas no ev9.dence of th9.nning 9.n any other region+

TUBES PLUGGED! None D. S/Qr 4Ap 49~ 4C DATRIL August " September, 1974 RHi>DON: Planned Unit 4 maintenance outage to find and plug leaking tube(s) in 4A, and perform minimal HC. inspect9ons of tubes surrounding leaking tube(s). The laaking tube vas found 9.n Pocr 16, Column 58 on the inlet side. At this time, Florida Power E L9.ght Company elected to convert to AVT

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chomistrj, therefore, a full scale HC inspection of all three steam gene..ators vas 9.nitiated to provide examinations'f reg9.ons whore evidence of tube va3.1 thinning'had boen detocted in similar

. generators of other oper"ting j3.ant's. Xn add9.t"on, tube lancing was conducted to romove sludge from the top of the tubeaheets. An estimated 30,000 gallons of eater vore used during the sludge lancing QffoJ TOMS XNSPL'CTED~

t 2024 at 400 KHz in 4A 9.nlet.

463 at 400 KH- in 4A'outlet.

2142 at. 400 KHz in 4B inlet..

24 at 400 ZHz in 48 outlet.

2104 at 400 KE4" 9.n 4C inlet.

38 at 400 KHz 9.n 4C outlet.

See Append9.x D for tubesheot plans indicating vhich tubes vere'nspected.

DEFECT XNDXCATXONS: 34 tubes 9.n the 4A, 9.nlet, 43 tubes in the 48 inlet, and 8 tub s in the 4C inlet shoved greater than 50 percent Chinning. Several other inlet tubes shoved betveen 20 and 49 percent thinning. Of'll the outlet tubes inspected, only 6 tubes 9.n 4A shoved greater than 20 percent thinning.

See Appendix D data sheets for defect locations and degree of tuba thinning.

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,~ ~-Nx..George Lear September 30, l975 TUBES PLUGGED'nlet tubes with greater than 508 thinning.

Sae Appendix D data.

PLUGGXNQ LXECXT: 50 percent wal3. thinning.

E. S/Qx 3A DATE: Septembez',

. 3.974 REASON< Planned Unit 3 maintenance outage to find and plug laa)ring tube (s), and perform minimal EC inspections of tubes surrounding leaMng tube(v).

The leaking tubo was found in How 43, Colunn 34 on the inlet side.

TUBES XNSPECTEDi 5 tubes were HC tasted at 400 KHz in the inlet side. They wexe the leaking tube and the fouz Cubes surrounding DEFECT XNDXCATXONS: The tube in How 43, Column 34 in the it.

inlet sido -bowed l00 percent, tuba wall thinning. See Appendix E for

,tubaaheet diagram shovring this

'location.

TUBE PXUGGED: R43< C34 inlet siie.

PLUGGXNG LXHXT: 50. percent wall thinning.

S/C: 3A, 3B, 3C DATE: September, l974

~PQQN g Unit 3 steam generator tubeshee4 cleaning vgao performed in preparation.for changeover to AVT

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chemistry. Ji high prcssure water'ancing technique was used. Approximata3y l0,000 gallons of watax wore flushed through ecch genoratox. See Append& P for tube sheet lancing schematic, TUBES XNSPECTEDs Due to the short shutdown, EC tosting was not attemptod.

DEFECT XNDXCATXONSi Hot applicable.

TUBES PLUGGED< None Go 8/6: 3Ap 38'C-DATE: October November, 1974 REASON: Unit 3 refueling outage px'ovided opportunity to gathex-EC data in regions where evidonce of tube wall deterioration had bean detected, in similar steam generators of other operating plants.

TUBES XNSPECTEDs beany tubes were inspected at 400.;100, and 25 KHz. See Appendix G for tubesheet plans indicating which tubes were inspected.

Hr. George Lear September 30, 1975 DHPECT XNDXCATXONS~ 19 Cubes in tha 3A inlet, 'in 7 tubes in the 3J3 inlet, and 6 tubes the 3C inlet shoved greater than 50 percent thinning. 'Z all the autlet tubes inspected; there vas no inimical:ian of thinning except in generator 33.

See Appendix 0 for ZC data.

TUBES PLUGGED> Z9 in 3A, 7 in 39, and 6 in 3C. A3.2. vere inlet tubes, the lacotion of vhich can be found in Appendix G data sheoto.

PLUGGXHG LXNXT: 50 percent vale. thinning.

H. S/Gi 4A, 48, 4C DATF: Pfayi 1975 HPNSOHi Unit 4 x'efueling outage provided oppoxtunity ta gather exten8ive EC data.

TUBES XNSPRCTED: Tho final report of this inspection has

'not. yet been received fram aux'SSS vendor, therefore, the data on tho number and lo ation of tD~ es inspected are approximate. Specific information identifying which tubes vere inspected vill be f:"on~ardod upon receipt o8 Che inspection report frail aur PSSG data are contained in Yendox'ppro.:inate Appendix F..

DLPHCT XNDXCA XOHSi 36 tubes in, the 4A inlet, 48 tubes in the 49 inlet, end 3 tubas.in the 4C inlet shaved greatex than 40 percent thinning. Xn addition, 27 tuboa in the 4A outlet, 18 tubal in the 48 outlet, and 93 Cube5 in the 4C outlot shoved greater than 40 percent thinning. Specific information on defect locations will be fonrarded upan receipt of the inspection report from oul NSSS vondoz' TUMS PLUGGED: Xnlet Outlet 36 Tn 4A 2~7n 4A 48 in 4a 48 in 4a 3 in 4C 93 in 4C A total of 225 tubes crore plugged.

PLUQCXNQ LXf4XTi 40 percent stall thinning.

X. S/Qt 49 Date: August> 1975 REASONS Planned Unit 4 maintenance outage to find and plug leaking tuba(s).

r~ g lIr George Lear Specific information on Cubes inspected and defect indications ~r3.11 be foxvarded upon receipt. of the inspection report from aur HSSS vendor.

S/Gi 4a nmz: September, 1975 REASON: Planned Unit 4 maintenance outage to find and plug leaking tube.(s).

Specific information on tuboo inspected and defect indications vill be faxwarded .upon receipt of the inopection report fxom our NSSS vendor.

2. Beconda 1'later Chemistry A. Current steady-state and. transient limits fox AVT aro contained in Appendix X to this letter.

B. Ximits for phosphate= treatment during the time prior to Z~VT canversian are a3.so contained in Appendix X ta this letter.

C. Appendix J contains general guidelines for transition from phosphate troatment ta iXVT.

"e uro una'e to provide secondary eater chemistry graphs D

'or the si>>: months prio- to termination of phosphate treatment and fo'r the time fxom the'onset of AVT'to the pxesent. This information io avai3.ab3.e anly in numhrica3.;.-

iorm and comprises several hundred data sh'eels; Hovever, if the information would be useful to you in .this form, vo vi11 provide capies upon request.

Very truly youxs, Vice President RBU!nch attachments ccrc Jack R..Newman, Esquire ,