ML17212B038

Summary of 811109 Meetng W/Util & C-E Re Steam Generator Tube Degradation Revealed During Current Refueling Outage

ML17212B038
Person / Time
Site:	Saint Lucie
Issue date:	11/12/1981
From:	Nelson C Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8112010100
Download: ML17212B038 (10)

Text

p

~ye, iiiii pie'i!s'as

-eS -o~9 NOV l )I) ]98)

Docket No. 50-'335 LICENSEE:

Borida Power 8 Light,Company (FPC)

FACILITY: St. Lucie Unit 1

'<I'I. 'h

-'IOV18 1981~

-9'/s Si IIVCISAR REGIIIATCCI COAIMISSIDI4

SUBJECT:

))EETING SUGARY - ST.

LUCIE UNIT 1 STEA)1 GENERATOR TUBES On November 9, 1981 we met withFPL.and Combustion Engineering (CE) to discuss steam generator (SG) tube degradation revealed by inspections during the current refueling outage at St. Lucie Unit 1. "A list of meeting attendees is attached as Enclosure 1.

Two CE SGs are in serv8'ce at t)ie plant.

Primary, coolant passes, through U-tubes which serve as both a boundary and a heat transfer medium,.between the primary and secondary fluids.

Them are about 8500 tubes in each SG.

Tubes in rows 1-18 (inner rows) have a single 180'-bend.

The remaining tubes have bio. 90'ends and a length. of l>orizontal tube.

As illustrated in Figure 1

'he SG design includes,a V (batiiing) support structure.

The plant operated from April to September 1981 with a small (a few hundred ml "-per day) primary to secondary l.eak.in the B SG.

After the plant was shutdown 'for reload the leaking tube,was identified, using Helium, to be in Row 10.

FPL therefore conducted an inspection,, using multifrequency eddy current testing, of the inner tube rows.

These tubes had riot been extensively tested during previous inspections.

The results of the testing thus.far are as follows:

' -------DEGRADED 1'UBES---/O'Y>

SG Total Tubes Ins ected Tubes Degraded 205 Tubes Degraded Tubes Degraded

< 20$

'20-40K

> 40Ã 2282 9

6 24 3228 17 4

42

- The majority of tubes tested are in Rows 1 through 22 and rows 66 through 74.

(Rows 66>>74 were inspected due to, potentially similar secondary flow restric-tions by batwing support.)

- All degraded tubes;are in Rows 1-18 and all but a few are in Rows 8-12.

- The de radation is in the U>>bend at or near the a ex of each de raded tube OFFICE)I SURNAME/

DATE Q

~ %he-eh@ra

......f;ha...tuba.

NRG FORM 318 (10-80) NRCM 0240 a6ion-4s-en t'e-intrnchs ef %he"Umber and"starts 20iOi00 Biiii2 PDR ADQCK 05000335 RECORD COPY PDR

~ ~ ~ 0 USGPO: 1981~~960 t-the"outsold "of

~ '.a y

t C

p

~,'lt C

p

~ Ett ~

r '

ttr ICE E

E' EC J I

E Et

~ 't Ci at I

E

~ V O'E t

t E

E E

E

~

C I

~ C C I ~

I

~ E

~ C

~ 4 f

C I

K

FPL FPL and CE could not specify the cause of this degradation.

The plant's SG's4Nve -been operated since 1976.

Support plate rim-cut was performed in 1979 to correct a tube denting problem identified in 1978.

FPL stated that secondary water chemistry control has been good and that no main con-denser tube leaks have occurred since titanium condenser tubes were in-stalled in Ihrch 1979.

FPL and CE do feel the cause is more likely chemical corrosion than a mechanical phenomenon.

Radiography is being done for addi-tional infomation.

FPL stated that the inspection results place both SG's in Category C-3 per Technical Specification 3.4.5, For Category C-.3, the Technical Specifi-cations require inspection of all tubes in each,SG.

FPL believes,

however, that they have met the intent of the Technical Specifications by bounding the problem with respect to numbei and location of degraded tubes.

There-

fore, FPL does not plan to inspect additional tubes during the current outage.

FPL's planned actions are to plug all tu hes with degradation

~ 20% (TS requires plugging ofWhes degraded

> 40K); have the plant on line by November 23, 1981; and, in about 6 months shut down for further SG tube inspection.

lte agreed that the extent of tube degradation appears to have been identi-fied; however, we -stated that a Technical gpecification change would be necessary.

to eliminate the requirement for further tube inspeCtions this outage.

Enclosures:

1.

List of Attendees 2.

Figure 1

SG Design cc w/enclosure:

See next page angina I sIgned by Chris C. Nelson, Progect I)anaqer Operating Reactors Branch 83 Division of Licensing OFFICE/

SURNAME$

DATEP ORBiIi3:DL C)", ""'""b 11/p~l NRC FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981~'-960

(

II I

II

e MEETING

SUMMARY

DISTRIBUTION Licensee:

Florida Power 5 Light Company r

~

• Copies also sent to those 'people*on ser'vice

{cc) list for subject plant(s).

h r Ir ~ \\br

~

~

)

KyhhC,

~ -.S Dgcket File NRC:,POR '="

I PDR NS IC-':-'-

TERA OR843 Rdg:".::

u01shinski QHeltemes; AEOD BGrimes RClark Project Manager Licens'ing'Assistant ACRS (10)

Mtg'5ummary Dist.

.NRC Participants l

\\

~ r r ~

~ r ~

t't...s

~r

~

h r'.rr r -~r,

~

~ ~

~ r r

~

ms.

Florida~Power

-8 Light;Company-;

I

• J CC:

Harold F. Reis, Esquire Lowenstein, Newman,:.Reis 8.Alexrad 1025 Connecticut Avenue,--N';W.=-.-

Mashington, D. C.

20036 Norman A. Coll, Esquire t

Steel Hector

& Davis'-

Mr. Jack Schreve Office of the Public Counsel

.:Room 4, Holland Building

--- -Tallahassee, Florida 32304 Resident:Enspector/St.

Lucie Nuclear Power Station lorida 33457 governmental arkway e, Florida 32304 2600 Blair Stone Road Tallahassee, Florida 32301 i 7:;.:i-I McCar hy, 14th Floor, First'National

'Bank Building-

"" c/o U.S.N.R.C.

Mi'ami Florida 33131<

~.-'- -

P.. 0.

Box 400

-.~~. >Jensen.Beach F

Indian River Junior. College Library '

':.~

":209 Virginia Avenue-.,

Fort Pierce, Florida.

3456-Administrator Department of Environmental 'Regulation ',','" Bureau of Inter Power Plant Siting Secti'on;

'~t

. !'.'Relwtions State of Florida i', ='.-

~..

"-==

',660 Apalachee P

~ al 1 a has se Mr. Weldon B. Lewis County Adkini strator't.

L'ucie.County

.'300 Y.irgin.ia Avenue, Fort Pierce, Florida Room 104'3450

~ arI

~ ~ ~

s i

U.S. Environmental Prot'ection Agency Region IV Office ATTN:-" Regional Radiation Repr esentative 345 Courtland Street, N.E'.

Atlanta, Georgia 30308

~

r Mr. (harles B. Brinkman Manager - Washington Nuclear Operations C-E Power Systems Combustion Engineering, Inc.

4853'ordell Avenue,* Suite A-1

Bethesda, Maryland 20014

1 Y

C Encl'os ur.e-"1

'OVEMBER 9,'1981 MEETING - ST.

LUCIE UNIT 1

SG TUBE INSPECTION NRC Chris Nelson Conrad McCracken Emmett Murphy Keith Qichman E.

H.

Gi rard Alan R. Herdt C. J.

Cheng Louis Frank J.

P. Lareau F. L. Carpentino Dave Earles H. K. Williams R.

M. Rentier R.

R. Mills H. Williams FPL.

I Dave Evans Ri ch,Kamins ky Robert Frechetre K. N. Harris R. J. Acosta George Gotch John Sheetz H. F.

Conrad V. Nerses Wm. J. Collins Robert A. Clark Wm. V. Johnston P.

R. Matthews 0

\\M

~

V. Benaroya Stefan S. P'awli.cki

) ~

~ w

~

~

~

~

ll STEAN OUTLET NOZZLE FIGURE 1

~

'1" IHSTRUNKHT HOZZI. E DEFLKCTOR

)X STEAN DRY ERS TOP HEAD S2 STEAL<

DRYER DRAINS 144 STEAN SEPARATORS It 1" LEYEL INDICATIOH ~

HOZZLE (4 REO'D)

F EKDYATER HOZZLE CLEVIS bRACr ET (4 REQtO) 1" LEVEL INDICATION HOZZLE (4 REO'0)

Itlli 'fli 00 YIJ444 710 (4r Stt)

I t tI, il 2 L

,/I I

14S" O.D.

I I

~ ~

(IIt o (

I s

~

~

b RINARY KAD INSTRUMENT HOZZLE (A RED'D)

INLET HOZZLK SUPPORT Sr)RT L

OUTLET HOZZI.E (Z RK0'D)

~