ML20236A614

Advises That Util Insp of Reactor Trip Breakers Revealed Catawba Pole Shaft Which Had Welds W/Indications of Cracking.Forwards Informal Technical Communication from Franklin Research Ctr Re Initial Observation

ML20236A614
Person / Time
Site:	Mcguire, Catawba, McGuire, 05000000
Issue date:	10/16/1987
From:	Hood D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
TAC-65955, TAC-65956, NUDOCS 8710220439
Download: ML20236A614 (10)

Text

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-1 Docket Nos.:- 50-369, 50-370 and 50-413, 50-414 OCT 16 087 DISTRIBUTION:

5 Docket; E11e- OGC-Bethesda

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3 NRC PDR SVarga/GLainas i Mr. H. B. Tucker, Vice President Local PDR JPartlow ~J Nuclear Production Department PRC-System EJordan ]

Duke Power Company PD#23 Reading l 422 South Church Street MDuncan- 1 Charlotte, North Carolina 28242 DHood' .

KJabbour j

Dear Mr. Tucker:

ACRS (10) )

Subject:

NRC Preliminary Observations Regarding Pole ~ Shaft Welds of the -

Catawba Reactor Trip Breakers (TACS 65955/65956) j Your inspection of reactor trip. breakers (RTBs) at the Catswba Nuclear Station l as a result of the mechanically bound McGuire RTB revealed a Catawba pole shaft j which had welds with indications of cracking. The Catawba pole shaft was pro- (

l vided to the NRC for independent documentation of the welds and further j evaluation of causes and effects of the weld cracks. The documentation and 1 evaluations are in progress and are being performed by ou; contractor, Franklin '

Research Center (FRC). As noi $d in'our August 5,1987' letter, we invite obser-vation of the evaluation by yo, r staff and that of the breaker vendor.

l To assist you t; this end, enclosed is an informal technical communication from FRC regeding their initial observation and forwarding rough drawings and photo-graphs of the cracks in the pole sheft welds for the center pole lever and the I

antibounce lever. Subsequent telephone discussions with FRC October 15, 1987, reveled that the center pole lever weld, when cleaned of dye penetrant, had 1 cracks at both ends. The cracks were propagating during service as evidenced j by flaking of the plating at the crack surface. The crack in the center pole 1 lever weld not shown in the enclosure is associated with the 1/4" lack of i fusion at the cold start, is 3/16" in length, and extends slighcly into the ]

base material. Sixty-five degrees of intact weld remained on the center pole {

weld after crack removal. About 115 degrees (3/4") of intact weld remained j for the antibounce lever af ter crack removal. 1

! s l We will continue to ke n you advised of these evaluations. A copy of the final FRC report will be forwarded to you upon completion of the evaluation.

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Sincerely, 4 8710220439 871016 f $DR ADOCK0500g9 Darl S. Hood, Acting Director Project Directorate 11-'3 Division of Reactor Projects-I/II

Enclosure:

As s;ated cc: B. McIntyre, W J. Jelovich, TI

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C. Pezz9, W T. Peeble, RII '

! See next page 95 0 g )t > 93 fl > p3il

! PD#I1-3/DRP-I/II PD#II-3/DRP-I/II PD#II-3/DRP-I/II PD#II-3/DRP-I/II l DHood/mac XJabbour MDuncan DHood, Acting PD l 10/g'/87 f 10/ 4 /87 10/f4 /87 10/ 4 /87

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g.'ED STATES

l 8 NUCLEAR REGU ATORY COMMISSION'

y WASHINGTON, D. C, 20555 o--

j OCT .1 g 1987 -

Docket Nos.: .50-360,'50-370-and .50-413, 50-414-Mr; H.LB. Tucker, Vice President-

~

. Nuclear Production Department-Duke Power-~ Company:

422= South Church Street . -

Charlotte; North Carolina 28242

Dear Mr.. Tucker:

l:

Subject:

NRC Preliminary Observations Regarding. Pole Shaft Welds'of.the.

! Catawba _ReactorTripBreaker:(TACS:65955/65956)L Your inspection of-reactor trip breakers (RTBs)'at the Catawba. Nuclear Station as a result of t the mechanically bound _ McGuire RTB' revealed acCatawba pole shaf t .

which had welds with indications of(cracking. The Catawba pole shaft was pro-vided to the NRC.for independent; documentation of the~ welds. and further ;~ -' -

1 evaluation of. causes and effects of the. weld cracks. The ' documentation'and o evaluations are .in' progress and are being performed by our contractor, Franklin -

Research Center L(FRC). As noted in;our August 5,1987; letter,, wel invite obser-vation of the evaluation by'your staff and that of the-breaker vendor.

\

To assist you to this end, enclosed is an informal technical / communication from' 1 FRC regarding. their initial. observation and forwarding rough.' drawings tand photo-  ;

graphs of the cracks'in.the pole shaft welds for the center pole' lever and the:

antibounce lever. Subsequent telephone discussions'with FRC: October 15, 1987,-

reveled that' the center pole lever weld. when cleaned of' dye penetrant,' had cracks et both ends. .The cracks were propagating during service.as evidenced

~

'by flaking of the plating at the-crhck surface. The icrack' in Lthe' center pole t l  %. lever weld not shown in the. enclosure'.is associated with the:1/4" lackLof -

4 o I fusion at the cold start, is 3/16" in length, and extends' slightly into' the - .l l base material. Sixty-five degrees of intact weld. remained on the . center pole ,

! weld after crack removal. .About 115 degrees (3/4")-of-intact weld remained ,

for the antibounce lever after crack removal. 1 We will continue to keep you advised of these evaluations. A copy of'the': final

~

FRC report will be forwarded to you upon completion of the_ evaluation.

Sincerely,1 .

j gh, /

Darl 'S. Hoo .. Acting DirectorL  :

Project Directorate II-3 '

, DivisionofReactorPro,jects-1/II L .

Enclosure:

LAs stated c j o o

cc:_ B. McIntyre', W . ~t W

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C.: Jelovich,T Pezzo,'W L

1T. Peeble,""RII .

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, ENCLOSURE..

INFORMAL TECHNICA.L COMMUNICATION. i

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Mr. H. B. Tucker Duke Power Company. Catawba Nuclear Station, [

CC: 1 A.V._Carr, Esq. North Carolina Electric Membership Duke Power Company Corp. .

l 422 South Church Street 3400 Sumner Boulevard Charlotte, North Carolina 28242 P.O. Box 27306 ~

Raleigh, North Carolina - 27611' H J. Michael McGarry, III, Esq. 'l Bishop, Liberman, Cook, Purcell Saluda River Electric Cooperative, and Reynolds Inc. .

1200 Seventeenth Street, N.W. P.O. Box 929 Washington, D. C. 20036 Laurens, South Carolina ;29360 North Carolina MPA-1 Senior Resident' Inspector  ;

Suite'600 Route 2, Box 179N 3100 Smoketree Ct. York South Carolina 29745- _

P.O. Box 29513 Raleigh,' North Carolina 27626-0513 Regional Administrator, Region II  :

U.S. Nuclear ' Regulatory Commission,  !

L.L. Williams 101 Marietta Street, NW, Suite 2900- ]

Area Manager, Mid-South Area Atlanta, Georgia 30323 i ESSD. Projects Westinghouse . Electric Corp.

.)

MNC West Tower - Bay 239 P.O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. Heyward G. Shealy, Ch'ief Bureau of Radiological Health South Carolina Department'of Health -

and Environmental Control-

- 2600 Bull ' Street Columbia,' South Carolina 29201.- l County Manager of York County j g . York County Courthouse Karen E. Long 1 York South Carolina 29745 Assistant Attorney General 1 N.C. Department of Justice- 1 Richard P. Wilson, Esq. P.O. Box 629 i Assistant Attorney General Raleigh, North Carolina 27602 ,

S.C. Attorney General's Office '

P.O. Box 11549 Spence Perry, Esquire l Columbia, South Carolina 29211 General Counsel -i Federal: Emergency Management. Agency Piedmont Municipal Power Agency

~

Room 840 j 100 Memorial Drive 500 C Street .

Greer, South Carolina 29651 Washington, D. C. 20472 -r

~

Mr. Michael Hirsch

. Federal . Emergency Management Agency Office of the General Counsel' _.

Room 840 - '

500.C Street, S.W. .

Washington, D. C, '20472 l

Brian P. Cassidy, Regional' Counsel Federal Emergency Management Agency, d.

Region I .

J. : W.1 McConnach POCH , <

7

. Boston, Massachusetts -02109 1

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l Mr. H. B. Tucker Duke Power Company McGuire Nuclear Station .

cc:

Mr. A.V. Carr, Esq. Dr. John M. Barry .

Duke Power Company Department of Environmental Health j P. O. Box 33189 Mecklenburg County a 1200 Blythe Boulevard. "

422 South Church Street Charlotte, North Carolina 28342 Charlotte, North Carolina 28203 '

County Manager of Mecklenburg County Mr. Dayne H. Brown, Chief 720 East Fourth Street Radiation Protection Branch Charlotte, North Carolina 28202 Division of facility Services Department of Human Resources 701 Barbour Drive l Mr. Robert Gill Raleigh, North Carolina 27603-2008 '

Duke Power Company Nuclear Production Department P. O. Box 33189 Charlotte, North Carolina 28242 s

J. Michael McGarry, III, Esq.

Bishep, Liberman, Cook, Purcell ,

and Reynolds 1200 Seventeenth Street, N.W.

Washington, D. C. 20036 Senior Resident Inspector ,

c/o U.S. Nuclear Regulatory Commission Route 4, Box 529 Hunterville', North Carolina 28078 Regional Adn.inistrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 ek - Atlanta, Georgia 30323 g L. L. Williams Area Manager, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239 P. O. Box 355 Pittsburgh, Pennsylvania 15230

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