ML19316A505

From kanterella
Jump to navigation Jump to search
Summary of 770215 Meeting W/B&W & Util Re Steam Generator Tube Leaks at Station
ML19316A505
Person / Time
Site: Oconee  
Issue date: 03/15/1977
From: Neighbors D
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 7912300022
Download: ML19316A505 (32)
v • d • e


Text

)

'4 UNITED STATES j

NUCLEAR REGULATORY COMMISSION g3

~$

WASHINGTON, D. C. 20555 g

j 5

o\\

..+ /

March 15,1977 f

00CKETS NOS: 50-269, 50-270, 50-287 LICENSEE:

DUKE POWER COMPANY (DPC)

FACILITY:

OCONEE NUCLEAR STATION

SUBJECT:

SUMMARY

OF MEETING HELD ON FEBRUARY 15, 1977, TO DISCUSS STEAM GENERATOR TUBE LEAKS AT OCONEE NUCLEAR STATION On February 15, 1977, representatives of Duke Power Company (DPC) and Babcock & Wilcox met with the NRC staff to discuss the subject topic.

A list of attendees is attached.

,M.

A three hour presentation was made by Mr. Hooker'of B&hwittt questions T

from the staff. As indicated in the attached copy of the.presetitation, j

several tube leaks have occurred at the Oconee Station over the past i

several months. There have been about 7 leaking units. Most of the tube leaks have occui ed next to an open tube lane in the steam genera-tor. The open tube ne refers to a design feature wherein one row of tubes was omitted for inspection purposes. Because of the location of the identified tube defects, the licensee felt that the probable cause of this tube degradations is high cycle fatigue cracking from flow induced vibrations. The licensee indicated that there is probably some other mechanism besides fatigue which initiates the local defects. The largest leak rate detached from any tube so far has been 12 GPM.

A method devised by B&W for repairing the leaking tubes was described at the meeting. That method is to stabilize and plug the tube. A

" stabilizer" is a sectionalized rod which is inserted from the upper tube sheet to beyond the identified defect and then is sealed at the Its purpose was stated to be to both seal and stiffen the top only.

tube. This repair which has already been performed on some tubes had not been discussed with or reviewed by the staff prior to accomplish-ment. We infonned the licensee that NRC should be consulted in advance on repairs of major safety related components of this nature.

I e

5

.? 91gggg

3 F

i Efforts are underway by both the licensee and B&'.i to determine the cause of the tube cracking. Possible causes being considered are changes in j

chemistry, changes in operating mode, unique operations, etc. at this time, no cause has been definitely identified.

k There have been no reported tube leaks at other B&W plants even though some have been in service as long as Oconee Units 2 and 3.

This would tend to indicate some unique characteristic of Oconee. The auxiliary feedwater supply at Oconee is different in that it comes from the upper surge tanks initially which is relatively cold water. However, there

+

i is no evidence that this could be a contributing factor.

.. Lab

0. E io Don 1 Neighbors, Project Manager J. Si h0perating Reactors Branch #1 F r.'. Division of Operating Reactors

Attachment:

List of Attendees

~

t i

_--~.

s

^

NRC MEETING WITH.

DUKE POWER COMPANY AND BABCOCK & WILC0X FEBRUARY 15, 1977 i

NRC i

D. Neighbors L. Frank B. Liaw R. Stuart D. Davis i

L. Shao A. Schwencer J. Collins

- ~. :,,.. i t... n, D. Eisenhut

'O J. Sliden H. Fontecilla J. Reece i

DPC W. Haller K. Canady B&W E. Hooker W. Reyworth R. Bonsall R. Borsum f

5:

i t

l DUKE POWER / B&W / NRC MEETING rn p

e<

r ',

in J

d 4

4 O.

OTSG TUBE LEAKS.v 24 1

/,

FEBRUARY 15, 1977 4

s 1

a i

O O

(_. )

(\\

[

AGENDA OTSG TUBE LEAKS STATUS

.I l

I.

INTRODUCTION II.

IllSPECTIOb.RESULTS FROM OCONEE 1 AND 2 i

III.

RESULTS FRON LABORATORY ANALYSIS OF TUBE SAMPLE FROM OCONEE a

l i

A.

DEPOSIT SAMPLES B.

METAL.LURGICAL' EVALUATION IV.

PREVIOUS VIBRATION ANALYSES:

EVALUATION /CORRECTIONPROCNAM V.

..me=

e-1 17

]'

~.m 1

A

~ ^ ^ ' " ~

i I

8 stACTOR COOL ANI INlti t

HANDHOtt 8AANWAY h

g

/

=

    • "' % i

,\\

' 9i,

" ~ '

b ;3 j

.* W d6 %.m

' JLJ U L.i1.,,

itFDWAftt - d.p Auntuty if G,

!h 1

!l NOZZtt

l {6 4

)

$TE AM -

b.

E f

ANNutus tt:.

q b{

}

y U-y y

~~

,, t A, Cuilti J ed J

HAH 0HOgg OR AIN a-----

.. t=

=77p.,

=

" ##III (I f INL(1,

IN17tVMINT [O 3 I 4-g yi

-. F_

CONHtCt:ONs e

k.

'i

. /yr k I' IEEDWATER N t AllNG

{

CHAM &gt

'M tunt f,

{

$UPrott

.PLAlt l

I

,\\

l 3E l

el l

l) 363.0 Mik s

(.a k

v I

  • ANoi:Ott l

[

(N5ttuNtN j

3 i

~

CONHtCilON s/

,s/ @q y h'/ V 9

,[ A'

\\

iv _m..

._ 5 f.I

/

atAC10t j

,6f Co ct At4!-

h}g MANCHOtt T-Outtti N ot A,H g

5

- OHCE T!:ROUGli STEAH GE!! ERAT 0f!

o

,j w

t I

e litLET 9

i I

J iO Q

SUPERMEAT REGIOM AT RATED LOAD g

f f

CAFFLE

+

9 I

Filli ColliuG STEAM Ct)TLET REGl02 AT RATED 1.0a0 OYP ASS STEAM FOR

_g FEE 0 WATER HEATING 3g gr i

...I I

i i

_ FEE 0 WATER ICLET

'I l

{

{"

l i

l 1

00VNCOMER

~

SECT 102 o

MUCLEATE

~

ColLluG REGIOW j-S!: ELL

/

AT CATED LOAD I

/

\\

REACTOR C00LAllT OUTLET Iz.4 }dL'Idd%<. e p

')' p kU(Y;h.h;.'

w, i.

  • Y#
  • M M" emm*9mmeMemmesm* M**** * * " 9 F "

- e sp-eemee w

..,..w e ase.

e e

g 4

100 r i

E0 Suporte i M

10 --

'NTA

.GQ

m=

s.a.

cg,

'(f l l

f n[O P' e

't

-2 set jf K

.a 1

3 zg 7'

O

._ l i

4._

30 F C Hucleato Bolling-y

-Film

+,-

f>g '

. \\

Bollin; 2p

_j M

m-gg Ip p

a g

6g to 100

'0 b

10 10 30 00 5

F.cted Po:M.5 4

e a

t g

s Y

'; t s

g

,.e.

.. n 44" # 4

<h j,* 7 *.

,..f p'e;J..'..'.

Vi>

3

t

..i i

l SUMARY OF APRIL,1975 NRC / B&W MEETING 1.

OTSG THERI1AL AND HECHANICAL PERFORMANCE

' CORRELATES WITH PREDICTIONS 2.

STABLE OTSG PERFORMANCE 3.

CAPABILITY OF HIGHER RATINGS (IE0TSG) 1

<rm xx. _.c. ; -

3._x
3

.n i

0TSG DESIdN JilillMIZE51kORRdSIC'[

I I

L17 5

~2

^

A.

STRESS RELIEF B.

STAGNATION C.

WATER CHEMISTRY 5.

INSPECTION RESULTS e

l I

,~

/,;';%;';.',;".%

~

_(_c (3{

BRDACHED TdBE SUPPORT PLA d

i g ;;

NOTE:

PLATES FABRICATED FROM 11 -1;!C11 2

TillCl( PLATE.

\\

'v. v vJ IbNIMUM OUTSIDE TUBE RADIUS.3125 INCHES Mit!!Mutil drill RADIUS

.320 INCHES r

'l

.l P

_ TUBEPITCH l

l.875" 1.010" l g@hk J'

s hf y

RQ LUXOR Or2

.., -,. _.,,....,.-,,,. _ m. m..,. m.. m

ONCE-THROUGH STEAM GENERATOR WITH INTERNAL AUX. FEEDWATER HEADER Primary inlet nozzle.

w

/

,N.

,[.N.

p/

Generating tubes

/

\\k Upper tube sheet 1l

, r', ' O'i.

=

t<

~,

.- Aux.liary i

a e

3 ie q, feedwater gP

!h 8l]0 ;c heade I

l; Upper shellq(

j[

a r-Tube y

support k

v Cylindrical i

plates 'j)TN h

baffle e

]. (i3

_4 t

k$'

t h

Steam p

f

=

2 outlet

\\sub nozzles

. _ i, A 19 M O O II J

l l

l l

-=

s i

)

('

i 1

i i

OTSG TUBE-LEAKS OF THE 12 BSW OTSG'S IN COMMERCIAL OPERATIO!1, TUBE LEAKS HAVE OCCURRED IN 4.

TOTAL NUMBER'0F LEAKING 'IUBES = 5 (6?)

t

' 21l l

~-

Oh

~

ALL OF LEAKS WERE -

'EE Ui1ITS, 3/6 IN

~

GENERATOR 1B.

MOST LEAKING TUBES ON OPEN LANE, REMAINDER NEAR l

PERIPHERY.

e e

~

p ___ _.

(

i t

  • F-W W

.I ln W

En M

O Of W

Q.

O.

C C5 U.-

e O i,

O O

W i

O.

5 C l

O O 3

.{

V E b I

p..

i oo h t0 d

oOO i

3 Oo

, w@

u o

s i

s o

C et

't Eq b

~

v.

.r, i

- j

.?

')

.~

()

'?

~*

OO 01 U

OhoOO

_0_

Os0

~

O m

l A

I c

y I

t.1 W

CD f.)

p p.

G

\\

L.D t/)

f C)

\\

I g

O m

00000 Z

d 00000000 0000000 x

p oc

)

g i

)L

  • O!! 3Cfl1 i

=

> m i

~E O 3 J

E H l

I==

f 4

j

CD

(-

-)

O T

\\,

1 l

's SUtV4ARY OF HAJOR OTSG T,USE EXPERIENCE AT OCONEE I

GENERATOR R0W TUBE ELEVATION DATE LANE LEAKER CONDITION DISPOSITION i

Plugged l

1-A 77 17 Tubesheet 11/76 Yes Yes Crack 3

1-3 114 109 14th plate 12/76 No Yes No visual Stabilized Inspection Stabilized 1-B 113 110 14th plate 12/76 Ho No Similar to 114/109 1-B 75 18 Tubesheet 12/76 Yes No 3003 Crack Stabilized 2-B 71 23 Tubesheet 12/76 Yes Yes 2700 Crack, Removed hole Renoved 15tb plate 12/76 Yes No Hear Appear-j ance 2-B 77 27 2-8 124 42 12th plate 12/76 No No Eddy Current Plugged Indication, 40-60%

3-8 77 11 15th plate 7/76 Yes Yes Ho visual Plugged I

l Inspection

2. 2 1-B 75 12 Tubesheet 1/77 Yes Yes 3450 Crack Stabilize'd 1-B 01 128 14th plate 1/77 fio No Eddy Current Stabilized Indication, 80%

/

\\

)

I j.

x

\\

c.

I OTSG TUCE IDEllTIFICAT10fl PLAff-VIE!!

I

/

i ft Bl/Til$

Ril3/TIlo v 8 h

b Ritt4/T'lo9 o

>=8 C

O Rt24/Ttt O

O O

O 0

0 O

00 bb og.

O og 8

RCV l-1'JBI I o

0 (Rl/Tl)

I w fr 77/T17 88 g*stn/713 88 A

R75/T'5 ]Q TUBE DEFECTS g

IlUMBERI!;G

]

  • l* 9 gb., i-O LEAK g

j.'

elllTi7

@ I!iDICATIO:1 PATTERtl 8-3 y

  • '6 h77/TlI R0W tt0.

RO.! 77 "oPit LANE TO Civif.R L

\\

[.

)

f i

1 OTSG TUBE LEAK INSPECTION PLAN IDEllTIFY LEAKING TUBE (BY FLOODING SE 1.

2.

C0t: DUCT EDDY-CURRENT INSPECT 10ff.

l.EAKER AND 10-15 ADJACENT TUBES BOTH ROWS ALONG OPEN TUBE LANE

~

. jTUBES WITH SIGNIFICANT INDICATIONS FROM iPREVIOUS ISI m, a.s. w:

\\

~'

3.

CONDUCT VISUAL INSPECTION.

l.D. AND 0.D. OF LEAKER l.D. AND 0.D. OF TUBES WITH SUSPICIOUS EDDY-CURREllT INDICATIONS INTERFACES OF TUBES WITH TUBESHEET AND SUPPORT PLATES F

INSPECT. SECONDARY SIDE DEPOSIT ACCUMULATIO ll.

VISUAL SCRAPE / WIPE SAMPLES I

I I

4 J

w

' M f

,,e.7 T. lin?S

+_

./

/$$ui,?l.';..l.*:.':

f l

)

OTSG lllSPECTIO!! RES'ULTS OC0liEE 1 a 2 I

DECEMBER 1976

\\.

UNITS GENERALLY VERY CLEAN; NO DEPOSIT 1.

LEAKER In 1B G14/109) INSPECTED ON 2.

)

CURRENT (COULD NOT REACH WITH FIBER IDENTIFIED DEFECTS l'N..TWO AD 3.

INSPECTED ONE (75/18) VISUALLY BY EDDY CURRENT; FROM l.D.

LEAKER IN 2B (77/23) INSPECTED VISUALLY, BO 4.

I.D. AND 0.D.

BOTH OBSERVED DEFECTS WERE CI 5.

G. AP: ARENT WEAR ON LANE TUBE (

PLATE IN 2B, J

^

1

N 7 _ __

(,.

ACT10!1S TAKEN BASED ON IllSPECTION RESULTS i

i.,

UNIT 1:

STABILI2E TUBES 114/100. 113/110, AND 75/12 IN GENERATOR 1,3.

~ ' 'i.

\\, c.u.a. _.

1 UNIT 2:

REliOVETUBES77/23IND77/27FORDETAILED EXAMIllATION.

Ptus TUBE 124/42.

I b

O i

g i

i I

i j

s I

i t,

1,,

s

.s

.g e

4 P

.i 4

EXAMINATION PLAN

/

FOR OTSG TUBE SAMPLES 1

I VISUAJ. EXAMINATION.OF 0.D.'/I.D.; PHOTO-MAP.

1 1.

.r

.~

CHEMICAL AtiALYSIS OF CRUD /D5 POSIT 0.: n,..

2.

SURFACE.

DETAILED SEM STUDY OF FRACTURE S'U 3.

77/23.

j e

1 1

b

--p

_w

\\ I

/

RESULTS OF LAB VISUAL EXAMINATION APPARENT WEAR" Ott 77/27 REALLY DIFFERENCE IN DEPOSIT COLOR.

LANE SIDE OF TUBES VERY CLEA!O LIGHT DEPbSIT ON BUNDLE SIDE.

n-

'r.

p.;

".,.+

DEPOSITlIS THIN, HARD AtlD TIGHTLY-ADHERENT.

NO CLEAR DEMARCATION AT TUBESHEET INTERFACE.

PORTION OF TUBE WITHIN TUBESHEET HAD LITTLE DEPOSIT (" WATER MARKS").

s j

l

.j

+

L

)

j

~

L.-

(

_s

. f q

CHEMISTRY RESULTS FROM TUBE CRUD SAMPLES J

SAMPLES TAKEN FROM 14 LOCATIONS O!! TUBES.

ANALYSES INCLUDE:

GAMMA ISOTOPlc X-RAY. DIFFRACTION AND FLUORESCENCE EMISSION SPECTROSCOPY-WET CHEMISTRY MAJORITY OF CRUD IS MAGNETITE (FE 0 ); NOTHING 34 UNUSUAL FOUND.

IYPICAL RESULTS:

SULFUR 0.47.

FLUORIDE 170 een CHLORIDE

.< 100 erM e

S k

\\

-r -

\\

3 c.

i 4,

OTSG TUBE SAb'?LE_

/

TUBE 77/23, OCONEE 2-B

/

n I,

TUBE SHEET SUPPORT PLATE DEFECT I

l FRACTURE SURFACE _

W L

l

~

---, 32~

~

a

" ")

CRACK INITIATI N RUBBED / BLURRED k--

HIGH CYCLE FATIGUE t SITE i

INDICATIONS si jiil

~

?{t i

it

'. }

N y

.A

~'

DEFINITE

/

HIGH CYCLE FATIGUE f

O g

e 333 RD)"TTA j

w JL1,b

=

j se-

)

FRESH DUCTILE FRACTURE J'

-n

_y sw NorED..7547 se.%)A r/w J

~

j

~,

/

i a

/

I

/

l i

s l.

I i

I i

1 I

i

SUMMARY

CONCLUSIONS t

i t

CIRCDIFERENCE OF TUBE CRACKED AROUND APPROX l

1.

l SHEAR RUPTURE EVDENT ON RDIAINING CIRCUliFER 270'.

CRACK APPEARS TO HAVE INITIATED AT ROUGHLY THE 2.

OF Tl!E 270* ARC AND PROPAGATED IN EOTH DIRECTION AROUND THE CIRCDIFERENCE AS A NEARLY THRU-W

,t L4TTER STAGES OF CRACK PROPAGATION CLEARLY BY 3.'

{

CYCLE TATIGUE: 'Il! PLIES HICH FREQUECY - LOW STRES

}

VIERATION.

NO EVIDENCE OF INTERGRANULAR STRESS-CORROSIO 4.

NO CLF.AR EVIDENCE REGARDING INITIATION OF CRACK, BUT 5.

.IlOICATIONS SUPPORT INITIATION ON OD.

/

CHD11 CAL / ISOTOPIC ANALYSIS TO DATE HAS IDENTIFIED 6.

NOTHING UUUSUAL OR SUSPICICUS.

e

./

e 1

e i

l

~~'

- - ~ ~ - -. - - - - -

s

4 l

OTSG TUBE VIBRATION g

ALL PREVIOUS ANALYSIS AND TESTING i

ON PERIPHERAL TUBES.

IUBES QUALIFIED BY:

ANALYSIS

.a

,,io J-m I'IODEL TESTS ACTUAL l'IEASUREMENTS AT OCONEE OTHERS ONLY UPPER SPAN SUBJECTED TO CROSS-F SEE ONLY PARALLEL-FLOW.

LANE TUBES ARE PROBABLY WORSE, BECAUSE

VELOCITY, IUBES FABRICATED WITH INITI'AL TEN e

e e

l

'Nl

(

u

/

, j-l OTSG TUBE VIBRATION RESULTS I

UPPER SPAN FREQUENCY RANGES FROM 39-5 1.

2.

RECEllT TESTS AT OCONEE SHOW:

FREQUENCY HAS 110T DEGRADED WITH TIME.

DEFECTIVE TUBES HAVE SAME FREQUENCY AS GOOD TUBES.

w t

2 L

o-

- N, MEASURED (1973)VIBRATIONAMPLifbDEOF,PER.IPHE 3.

TUBE 0.009" 1N OPERAT10t1 AT OCCNEE.

MAXIMUM VlBRATORY STRESS WOULD OCCUR AT U 4.

TUBESHEET FACE.

ANALYSIS SHOWS THAT LARGE AMPLITUDE (

5.

PEQUIRED TO EXCEED ENDURANCE LIMIT.

i l

NO EVIDENCE,0F LARGE AMPLITUDE (GROSS WEAR OR 6.

)

RATTLl!1G OF TUBES).

NEED LOCAL STRESS-RISER (DEFECT) Ill TUBE TO CAUSE VIBRATION FAILURE.

i t

J

L_)

Q*

O f

i r

l j

\\

SUMMARY

MOST OF THE LEAKS HAVE OCCURRED IN LANE TUBES O

THE LANE TUBE LEAKS RESULT'GROM THE PROPOGATION O

OF A LOCAL DEFECT BY HIGH, CYCLE FATIGUE I

THERE PROBABLY IS SOME OTHER.' MECHANISM BESIDES

.I l

0 FATIGUE WHICH INITIATES T,HE-LOCAL OEFECT 1

qc l

/d j

THERE'IS NO EVIDENCE OF INTERGRANULAR STRESS ch

_. ~

0 s

CORROSION t

THERE IS NO EVIDENCE OF THE TUBE FAILURE MECHANISMS I'

Q IDENTIFIED IN RECIRCULhTING' STEAM GENERATORS (DENTING AND WASTAGE) 9 l

i i

  • ~ ' - - ' - " -

' ' - - ~ - ^ - - - - -

  • e

_ _ _ _ __ _ _ _ __ : _ 7___ _ __ __'r*_ __ *;_ 7 "- "--- - _ _ _'.

O O

CD t

l OTSG TUBE LEAK EVALUATION / CORRECTION PLAN -

'i :

L=.

DETEPJilNE THE CAUS

. 0F THE OBSERVED TUBE. LEAKS OBJECTIVE:

IN THE OPERATING OTSG'S, DEVELOP AND IMPLEfiENT l

CORRECTIVE ACTIONSJO STABILIZE THE DAMGED 1

TUBES AND PREVENT llECURRENCE.

. > i 0.,

j 6

i p'

4 e

e e

~)

\\...

CD

~

O C3

[

~

+i OTSG TUBE LEAK _

EVALUATI0iUCORRECTION PLAN _

1

(

i

\\,

1.

PROBLEM IDENTIFICATION I,

PdTENTIALMECHANISMSFORTUBEFAILURES i

II, I

DATA COLLECTION AND ANALYSIS l

III.

/

j DETERMINE CAUSE(S) 0F' TUBE LEAKS i

IV, l

V.

DEVELOP FIX(ES)

~

VI.

IMPLEMENT FIX(ES) h at

,b

./

}

\\

+

_J

-n w q 7._

T.l b-n & A

  • H. y ~ a -

W.

.. m q.3a ty.,, u.

.,. u_. u, m u_ p,,o Lp

"#'# W A~h C~3 O

C3 %,,va a s

III. DATA COLLECTION AND ANALYSIS _

REVIEW CURRENTLY - AVA.I.LABLE EDDY CURREf1T i

A.

REVIEW PLANT OPERATION HISTORY.

B.

REVIEW MAi1UFACTURING HISTORY C.

REVIEW PREVIOUS OTSG ANALkSIS AND TESTIN D.

PLAN AND IMPLEMENT ADDITIONAL TUBE INSPECTIO I

E.

~

l s

ii J:

{

CURRENT PROGR AM

, DETERMINE CAUSE OF LEAKS:

COMPLETE METALLURGICAL EVALUATION OF TUBE SAMPLES 9

COMPLETE CHEMICAL ANALYSIS OF DEPOSIT SAMPLES

,, q O

THERMAL / HYDRAULIC EVALUATION OF LANE FLOW-0 tr DETAILED STRESS AND VIBRATION ANALYSIS OF LANE TUBE I

9 l

i DEVELOP POTENTIAL SOLUTIONS:

BLOCK AUXILIARY N0ZZLE ON LANE 0

i O

ALTER LANE FLOW O

STIFFEN / STRENGTHEN TUBES e

5 m-

. )

\\

.. l

-.-..--......--.;....-..-~.....

N.____

/.,

/

C0ilCLUS10tlS OllLY AN EXTREMELY SMALL NUMBER OF TUBES HAVE DEVELOPED DEFECTS.

MOST OF THE DEFECTS OCCURRED IN LANE TUBES.

VIBRAT1011 CAUSED LOCAL DEFECTS TO PROP 0 GATE.,

VIBRATION IS A MECHANICAL PROBLEM WHICH CAN-BE FlXED.

IHERE IS 110 EVIDENCE OF CORROSION OR THE RECIR-CULATING GENERATOR PROBLEMS'(DENTIliG AllD WAS THE LEAKS ARE A SERIOUS AVAILABILITY PROBLEM, BUT NOT A SAFETY PROBLEM.

4 g

\\

\\

-)

e 2

.j

-)

I oQ Meeting for Oconee Nuclear Station Docket Filefs' NRC PDR LOCAL PDR ORB #1 Reading NRR Reading B. C. Rusche E. G. Case V.Stello D. Eisenhut K. R. Goller T. J. Carter OR Branch Chiefs OT Branch Chiefs Project % nager

~

Ator f, OELD OI&E (3)

OSD (3)

B. Faulkenberry, I&E D. Thompson, I&E S. M. Sheppard Receptionist, Bethesda

,r-3:

Staff Participants

~

~,,,

~.

R. F. Fraley, ACRS (16)

I 4

j i

r G

- %?

+

-,s e

4 ag..

.~ I 3

y 1

-

Retrieved from "https://kanterella.com/w/index.php?title=ML19316A505&oldid=4794903"