ML20126C441

Preservice Baseline Insp of Low Pressure Turbines. Westinghouse Ultrasonic Insp Program Encl

ML20126C441
Person / Time
Site:	Sequoyah
Issue date:	03/11/1980
From:	Simmons, Ziegler TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20126C439	List: ML20126C435 ML20126C441
References
SMI-1-1-1, NUDOCS 8004010379
Download: ML20126C441 (12)

Text

q a,, s.,....,i ENCLOSURE 1 Flan; M n te r ~il.3 S!:pe r u.'.en. en t

,T Ar.uittant Superintendent. (Cper.)

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A n i.s t a ri t S ep.:r. n t en d an t (Maint.)

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Ma i ar caa,c r- 'lo;. f rvi r a r fM; Assi>. tar.t Maintenance Suoervisor (E)

FP.E3 fRV I "' E/d'EL :I ::: r. '. ' t. :' 1

% int enance Supervisor (I)

_ Peur i t r. Supoe vi sc.r UNI'.' 1 LO ' Fu

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___ Ope ra t i ons S upervi:.o r Qua l i t :. Assur.4nce Supervisor

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Public Safety Services Supv.

, _ Chief Storekeeper Preop Test Pro;; ram Coordinator

_ _ _ _ Outage Director

'O Ch ric.il Engineer

[~_ _ Radi,chen Laboratory

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Wes tin;hou:,e Ult.ra.<cni Innrc tlon ProcNinre for Untt 1 LP turbines.

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Rev. 0 1.0 P!!!:PCSr. Em alt L! CAP,1 L1TT The purpose of hts i r..< t ru e t ' on i t: to ;

,via" a prv~<bire for preservir.e in-1.p.ctica of the !!att I lev y com. ore tm: , to de cin;ne the rendittoa cf t.Se *.trbirn, prior ta wz v t r.

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.i s a..u..ine for future inse"' ice a

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V i n a.i l and vola,t+o minit.<.c r.: t h' t o to r r:, dish, rid 4

blading :s requir,td ty r.ectn.n ) 3 t

t'e ("shnica! -puctiications will ce pe r : a r:r.i: d a v i.n ov,juati.in

.o y f l ne i r o i c i t i n re, f ran ! v: r i n;.; t h i a t ra-s e rv i ce e.::ami na t. o : hail be r~p u t.i o the Vu :in.it he.r21s tc ry G=.i ': s i r,'

'. t) 1 D,i'. ;. e.n,'u. ' Trs Me 2.1 All torh s al; bc. c<,c ed : rw. e d th r of the c re r ' r ion '. r n<;t ion and th::

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2nginee:

Equirnent removed t rom ne rv u e r.halI be tag;,cd by liold Order procedures and tne c o.;.n i r i n t ioreman or r.upervisor shall re.nain on the llot! Or.Jes until utk t :. toirpleted.

Refer to Al-9 2.0.D for

u:;ing vt th a Tea:pa ra ry A1 t era t i r."

i'nn: rn L Tc.rm for t te n3 within a cl arince.

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'.'b;e rve a ll p re i. :.e. t v. t % ce r.t a i r: e.1 in TVA Visua l T.xar:linatic.r. i'ror dure N-VT-1 and We u i r.ghouse Ul t r u:oni c insi'ect i on l'rocedure (Pun:.bli s t ).

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4.0 Prf!-M:ATIO.N FCh WCF3.

Identify and :btain any special teoit require'l for work.

Ref er to vendur uanual., and examinat. ion pr occ lut es lieted in preceding stap.

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.P..E_R.r0h'.'ANCE OF KNK 5.1 D ia.na.ea.t l e h? Lorbit:"

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.Rev. o 5.0 PERF0.".MMICE OF 'JORX (Cont. )

5.4 Reassemble turbines per vendor r-nual and ret.orn to turning ;; ear.

5.5 Report inepcetion recults ami rvaluat ic.n3 t3 th. NRC cor,tmiusica fcr their 3CCept3nCO.

NOTE:

The swa'wnce o f L? t :t h i tse d u..i.ss et. bly and rec c..wmb i/- aay te adj usted.is necersa ry t. ) mini..ti ae cr itical pa t h tire anti ovct-all seneaul<.

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To be completed by the crit;inat.ec :f the w>t k. lata padage Lbt the docwnent: that are requiren to pe r f o r m the wrk and re tt.t:. tl.e equi e c.t t

C0 service.

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Visutil exarnina t ion ct.mplete and ca t.

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ENCLnSURE 2 DESCRIPTION OF W UT INSPECTION PROCEDURE For in-service inspection two ultrasonic techniques, namely the tangen-tial aim and radial aim scans, have been developed to detect and estimate tne depth of disc keyway and bore cracks.

The in-service ultrasonic inspection does not require unshrinking discs from the rotor.

The tangential aim scan is used to locate cracks.

The technique requires sound energy to be coupled and directed tangentially towards the keyway from a precalculated position on the hub.

This is accomplished by means of a compound angled plexiglass wedge.

The wedge is machined to provide a contoured face which makes complete contact with the disc hub, while aiming the sound energy at the disc bore / keyway.

Crack indications occurring

+30 deg. of the keyway apex and at the bore will reflect the sound energy.

The tangential aim scan is performed both in the clockwise and counter-clockwise directions. This procedure permits locating crack indications Jkith respect to the keyway apex.

A radial aim technique is uced to confirm cracks located by the tangantial aim scan.

The technique is also used to determine the crack depth by comparing the time lapsed in obtaining a ultrasonic reflection from the crack with the time to obtain a reflection from the keyway or bore.

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