ML20040E361

Final Deficiency Rept Re Colt Emergency Diesel Generators. Unit 3 Generators Inspected & All 1 1/4-inch Flared Fuel Lines Replaced

ML20040E361
Person / Time
Site:	Millstone
Issue date:	01/26/1982
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, B10404, NUDOCS 8202040226
Download: ML20040E361 (2)

Text

-

"*"*'*'*"'"*5d*"5""**"'"**'"'

IMHrl'HI!AST IFFII.ITIIIS 3 ' C :l'.T!TU T ~~~ $A*foEconstericuT osioi lll .7:::;::L';%'L"""~ ow*sen L c A T:%:..=,'l::::

January 26, 1982 Docket No. 50-423 AEC-MP3-262 B10404 v

f/ ., 9 Mr. Ronald C. Haynes r r MD ,

Region I Office of Inspection and Enforcement i 193 70 b 9.0 U. S. Nuclear Regulatory Commission fic;ghff yG jf 631 Park Avenue King of Prussia, PA 19406

\ v' j, k -p

Reference:

(1) W. G. Counsil letter to B. H. Grier, dated August 29, 1980.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction; Final Report 50-3 Colt Emergency Diesel Generators As required by Title 10, Code of Federal Regulations Part 50, Paragraph 55(e), Northeast Nuclear Energy Company (NNECO) reported two (2) poten-tial significant deficiencies in the construction of Millstone Unit No. 3 in Reference (1). These were reported because diesels similar to

> the ones being supplied for Unit No. 3 experienced problems which could have been generic in nature. The reported significant deficiencies specifically resulted because of the following.

o Failure of crankshaft thrust bearing - A failure of the crankshaft thrust bearing occurred on one of two Colt diesels at South Carolina i Electric & Gas Company's Summer Station. Preliminary evaluation i revealed the most likely cause or failure to be the omission of l plugs in the oil supply system for the bearing, o Failure of crankshaft thrust bearing - A failure of the crankshaft thrust bearing has occurred during shop tests of the Number 4 diesel generator set for the SNUPPS contract. It was determined that the detail drawings provide inadequate clearance between the thrust bearing halves to allow for thermal expansion.

l l

O O O 3 S PDR ,

Ih 1

, Since our interim report Colt Industries has provided documentation to l the NRC, see Attachments (1) and (2), closing out these potential signi-ficant deficiencies.

In addition to the above items, your Resident Inspector indicated in a meeting on November 24, 1981 with our Mr. B. L. Carlson, Assistant Project Engineer and Mr. J. M. Powere, Licensing Engineer, that one other open item existed concerning the Emergency Diesel Generators.

l That item was identified as a result of the following incident:

o Flared Fuel Lines lk". During the 300 start test of the Beaver Valley Colt diesels, a flared connection in the ASME III CL 3 fuel return piping was observed to be leaking. Examination of the tube showed a crack at the base of the flare. The failure was determined to be as a result of a stress riser in the tube which was caused by flaring with a flaring tool not having a chamfer or radius on the female portion of the tool.

The Millstone Unit No. 3 Emergency Diesel Generators have been inspected and all 1k" flared fuel lines were replaced, as documented in a letter from Colt Industries to the NRC dated March 21, 1979, see Attachment (3).

This letter constitutes our final report closing out all items related to the Colt Diesel Generators. We trust the above information satis-factorily responds to your concerns.

Very truly yours, MILLSTONE NUCLEAR POWER COMPANY

. LIT W. G. Counsil Senior Vice President cc: Mr. James H. Sniezek, Director Division of Resident and Regional Reactor Inspection Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555

-- -- ~ _

Docket No. 50-423 Attachment 1 Millstone Nuclear Power Station, Unit No. 3 Colt Emergency Diesel Generators 1

January, 1982

- /

Colt industries

[',.pn*l'5fy'

.u . =. , .. .

T[

.a 'UIlP Q[ t .

0;tcher 2, 1961 Office of Inspection s Enforc ment U. S. :. clear Regulaturi W::ii15 ion ,

7 9 i;cesevelt Rned Gler El;/., Ill. ECl37 Attention: F.r. James G. Keppler, Directcr, Regier. III Sutject: Colt Ir.dustries-Fairbanks Merse Engine Division Energenc; Diesei Generators South Cercline Electric h Gas Co.-Sun.::.er Staticn Janaery it,, 1300 Part 21 Report-Failed Engine Thrust Searir.g Sapplement r;o. 4-Nortne6st Utilities, Millstorie !!!

Gentle:nen:

We nave completed our inspection of the crankshaf t thrust bearings cr the two Diesel Genert. tors for Northeast Utilities, Millstorie 111. The plugs were properly installed in both units. The units are free of the reported potential cefect.

4 A ccpy of this report is being forwarded to the utility irvolved Vic the A/E.

..e vnli report our findings on the ren.aining suspect units as the inspections are made, prior to Ineir initial cperation.

Very truly yours,

/ -

,;/My~

4. Moriarty 14ANAGER UTILITY 'LES JtiM:jc cc: Stone & Webster Engineering Corp.

P. O. Box 2325 -

Boston, Mass. 02107 Attention: Lead Electrical Engineer -

J.0. No.12179 U. S. Nuclear Regulatory Conunission c/o Document Management Branch Washington, D. C. 20555

<AD D 1ll .

y _--

,--y- -,- - - . . , - - , - , , - -

w _ ,_w - - - - , - e N,,,p

Docket No. 50-423 Attachment 2 Millstone Nuclear Power Station, Unit No. 3 Colt Emergency Diesel Generators l

l r

i January, 1982 l

l r

l l

r l

y-_----_-____ -_

F airtainks Morse . ;e- U

. Er.gire osmicn } ,, i

• i volt InduSin.6S  : . , <.o .en.,

u

&*t

e v.x

<.a.w I

Ocicte 2, i El Of' ce cf Irs. ecti m i. Ei.f orce:nei.t

• U. 5. I.uci t:r RC g':l ~ *, cry f ct r.i f s ici.

799 Roosevelt Rate Glen Eliyr., 111. C0127

tter.t icr. Mr. Jarh G. /,capler, Director, Regicn !I

1 Sutject: Colt industries-Fairbanks Marse Er.gir.e Divisior, i ..ergen: . Di ese'. Ger.t:ro tors f M.L'Ei. cur!raCl Fart 21 Rcpcrt-failec Engir.e it.rast Eearing

'by 2, i E 's 5-:.ce.r. east Liiitu es, Mii stc:.e !!!

Lu p;. l e:..e t '.. .

Gent l er:er..

'se have ccrgletec oar inspection of tr.e two Colt-Fielstick Type Tr.ese FC-2 inspe:-

Diesei Ger.erator Sets for I;ortheast Utilities, Millstone Ill.

tions ere n.ade to . ritten procedures utilizing tne revised crawings Both units ir.enticr.ed are in i:. cur May 2,19c0 report which provide adequate clearance.

ccnc,siiance witn tne inspection procedure ar.d are free of the reported poter .ici defect.

A cepy of this :eport is being f orworded to the utilities inetlved.

Very truly yours, h

f),/ /Gn~a"L # <

o. .. Moriarty MA!!AGEi! UTILI aALES JMM:jc cc: Stone & Webster Engineering Corp.

F. O. Box 2325 Boston, Mass. 02107

.ttention: Lead Electrical Engineer J .0. tio. 1217 9 .

4 U. S. Nuclear Regulatory Comnission I c/o Document Managetaent Branch Washington, D. C. 20555 E -

CJ j)f M1

• Mh/Q

-v

,y- r -

)

l

Docket No. 50-423 Attachment 3 Millstone Nuclear Power Station, Unit No. 3 Colt Emergency Diesel Generators January, 1982

1 , A h * .o ; -.

C% tit':ltt- r*".o, ae o'n"..~.c c

- 701 Lam *m Aw-M. De-< s .

k,c % .44' s

March 21,1979 AK 7 90 3 2 6 0012 Office of Inspection & Enforcenient U. S. Nuclear Regulatory Comission h 799 Roosevelt Road

( Glen Ellyn, Ill. 60137

/ ttention:

A Mr. James G. Keppler, Director, Region III

Subject:

Colt Industries-Fairbanks Horse Engine Division

. Emergency Diesel Generators Part 21 Written Report Dated June 23, 1978 1-1/4" Flared Fuel Lines Closing Report-Northeast Utilities Millstone 111 .

lw Gentlemen: -

Our June 23,1978 Part 21 Report indicated that the 1-1/4" flared fuel lines on the two Diesel Generators for Millstone III, which were in storage at our plant, would be inspected prior to shipment.

G

All 1-1/4" flared fuel lines on these two units have been inspected and replaced with lines meeting the fitting manufacturer's recommendaticn for flare 0.D. and radius.

The units are now free of the potential defect reported.

Very truly yours, I

J.f.Moriartyh M tt A MAhAGER UTILITY ES Jr/::j -

cc: Stone & Webster Engineering Corp.

l P. O. Box 23?5 Boston, Mass. 02107 Attention: Lead Electrical Engineer 2

J.O. No. 12179 -

_/ f / -- s-p 7 f

/ ,

Y e l

l n