ML20148F719

Notifies NRC of Crack in Weld of Lube Oil Header That Dev During 300 Start Qual Test.Design Is Inadequate for Pressure Reached When Starting Unit.Corrective Action Will Be Taken for Those Units to Which Defect Applies

ML20148F719
Person / Time
Site:	Millstone
Issue date:	09/29/1978
From:	Moriarty J COLT INDUSTRIES, INC.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20148F701	List: ML20148F697 ML20148F703 ML20148F707 ML20148F711 ML20148F719
References
NUDOCS 7811090136
Download: ML20148F719 (2)

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N ij Cd! Industries ciu cant,anusfacc.c Engne ohnsion p" r.e :o,ta w.m w.

.m n , a w ....n a n 9 \*.. 4. m) ltW 4.t M September 29, 1973 e y.:, 1 M.,

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Of fice of Inspecticn & Enfcccewnt c T y, U. S t.uclear fler,ulatory Cu ai;sion 799 Rtm evelt Caad A f

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/1 ten ion: Mr. J W s G. Keppltr, Director, llegion 111 i sus'ott: Cult In lu.t ries-fairbanks Marse [ngine Jivision L.nergency Jie:al Cencrator:.

l 1abe Oil Header Defect Re f e re a : Phone convartotion reporting inforr.t.nn contained below to U. S.

Nuclear Regulat ory Coa ilr.cion, Nr. U. W. Hoyes by Mr. J. M. Moriarty of Cc.lt Ir dustries-Fairbanks Morse Eo lin' Divisica on Septerter 29, 1978 Cemle; a f.14-;jlinder PL-2 poser ed engine genwt to s delivtced for in,tallation at the Ian 'Wat t Utilities Company's Millstone ;i! ,ite has been undergoing its 390 st art luuli f ication te s t.. During this test, a c ack neveloped in a Wuld in the lobe oil header necar the oil inlet flange 0 bout 5 uinutes inte the loaded operation pe tion of r. tart cl34. The schedaled operatien va finishcd, the engine shut down, tnt weld repaired and 'he test rer.umed. Conc urr ently, a design review was initiated an! i t ua', .10temined tnat '.he design is inade,;w te f or the pressure reached when starting the unit.

lhe analysis and confirming natcrial yield test was completed etoat 6 P.*4. on 9/P7/73. This analysis indica ting an inadequecy was further confirmed by a cra:k which deveivpea 9/21/7H on start #241 in the sa ae general location but on the oiqctite side c.f the same part which failed previously. On start #241, the failure was larger ' uch tha t imediate shut dn n of the engine was required and it i'

.ur opinion that th. i. rad repc ired o f ter s tai t 41.0 wuld alsa have progressed raid!y to a roint ihai toe eng.ne would not be opurable in a relatively short time if u a e quir haJ s.st teen riade.

Il e d%ign of the inlet portion of the header was changed in 1974 from a rounc n ctiun to a lectangul.a set tion to clininate a "; ocket" betweer. the inlet sub i t se. .iy and the round portion of the header wnitii runs the length of the engine to ' ro'. % for cleaning of the veld at the 90 deuree intersectinn of the inlet sub-es: c . b cnl the n t.no he3 der soba'scubly, lhe sLn.~ f ural design of the rectangular sub wl.iy was inadequate and was further deip adod t'y a later dnign change in lobe oil pr< nure reliet valte setting f ro.a 100 PSI </

ne tir.e the ur.it was ouilt to 1H PS: neier to tFe 300 star t 1%i to provids fcr additional (1ul1 lube oil pump c c; x h .> , f l N: tn the lubricatien and piston rtuling oil system. The possible this pressu c cnange N t he hea.ter dtsign us not checi.ed at the time 9efic.(t 11 .u . + and, whib not the reo on for the actual failure since andysis shows tot hit h a ' tress wi th the 100 PS! sot ting, it ducs kJitate a t reakdown of design can: rc! with reyJ .t es r!dsign cnrges t e handlN it. Uo: 5 30.c uanncr as ti'a criginal det..n. ~ q 78110806 /

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. A S. Nucl'eu r Regula tory Co,. .i ss ion n ten.!)e r 29, 1973 2

Units involsed are ? units shipped to the Soutii Caiolina Electric & Gas Co. ,

Sur:mer Station site, 2 units in s torage at !!eloit f or Dtaluesr,e Lijht Co. , Ceaver Vallej Unit 11, and the other Millstone Ill Unit also stored at Beloit.

Mone of the at ove units are in operation and a corrective action pian is being developed for i:-plea.entation prior to start up of the shippcd units or shipacnt of those still in our plant. The af fectect utilitics ara Leing advised L4y ccpy of inis report.

'i will Leep you inf arn,ed to .;e proceed on this matter.

Very teoly yiars,

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