ML19317F538

Ro:On 771110,defect Discovered in Auxiliary Feed Pump Turbine Installed at Facility.Involves Potential for Governing Valve to Close While Turbine Not in Svc.Closure Caused by Excessive Vibration of Adjacent Startup Feed Pump

ML19317F538
Person / Time
Site:	Davis Besse
Issue date:	11/16/1977
From:	Roe L TOLEDO EDISON CO.
To:
References
REF-PT21-77-018-000 401, NUDOCS 8001150852
Download: ML19317F538 (2)

Text

. ..g

~

^

fg r.

x g -~ --- 1 rn.tcco DJ LIr,>dL w Jm .y n, F" u l ', , 1977 g , , a 2, , ,2

%ce Presstred Dockae No. 50-346 w ca -

um ess spo Serial No. 401

~7 7-6/N00 %-

Mr. Jacoc G. Ecppler qgl Rogional Director, Ec31on III '

D O

Office of Inspection 6 Enforcement gg U.S. NucloAr Regulatory Cor.nission ,

c 7 M Roooovolt Road O I, D ,_ 9 .

Glen Ellyn, 1111ao10 60137 , , [gb 3 Dear Mr. Kopplers In accordance with ICCFR Part 21.2.1(b), this is a report of a defect in a conponent insta11c.! in the Davis-Besse Nuclear Power Station Unit No. 1 The component involved is the auxiliary food pu:np turbino.

The aur.iliary fccd pn;;pa wore supplied by Byron Jackson Pump Division.

The otenredriven pu .? turbines were supplied by Tctry Corporation to Dyron Jach:en. In turn, the turbine governors woro supplied to Torry Corporation by Woodunrd Governor Company. The turbino is designatad as a Type GS-2, horizontal oplit casing, helical flow turbino. The turbine governor to identified as n *2ype PG-PL.

Tha defect involves the potential for the governing valve to close then it should ba open while the turbine is not in service. On October 16, 1977, the coverning valvo on turbine 1-2 was found in the closed position when it should.have been.open. Apparently, oncessive vibration of an adjacent secetu? f eed purp caused -the govern *ng valve on cun111ary feed pung turbine 1-2 to clocc. The cafety hasard which could be created is the potential for both anniliary feed purtps, if called upon, to fail to coc:e up to dosited speed upon otartup in the ovene both had been unknovir exposed to vibrations of the naturo experienced by turbina 1-2. This could recult in a ccupicte loos of aur.iliary feeduster flev to the ocean generatora if such flow were required. This in turn could causo signifi-cant react.or coolant nyntera pressure / temperature transients, and reactor coolant system heat renoval difficultica if cubstantial decay heat were present in the reactor enra.

Ca Pove.nor 10, 1977, the deviation was evaluated by Toledo Edison to be e defect. This acteer ws: reported to your Mr. T. Tambling on Movenbar E and again on Novenber 14.

l@f C 'l '80'i7 NfN TNE TOLEDO ECiSON COMPA!N EC;3ON PLAZA 3C0 MAD' SON AVENUE TOLEDO. ORO 40352

~

1

.g - .

~ . . . _;. -

aeo31_s.oggy ,

i. " . .. ,

a ,

a There are two identieni auxiliary foad pucps trith thio turbine incti11cd

.in Dsvic-Desse Unit No.1, cl.though only one uns affected by tha deucribed incidunt.

The co plete corrective action to be taken is to dato not definad. On defcet is under invcotigation by the turbine supplier, and correctiv..

cction is expected to bc ce=pleted V thin two vecks. The correcti,-o actica already taken is that during cli c:artup feed pu=p operation;:, an operator checks the poaition of the aux 111 cry feed pump turbine governing valveo avery 20 minutco to casure that the cuniliary fccd put:p turbice governinc valvan vnmain in the open pocition. Auxiliary feed pump turbine 1-1 governor valvo hca not e:tperienecd a cimilcr problea, because it is not adjaccat to the otr.rtup feed pu=p. Control roon icdication is nino available for the full open and the full clocod gove.irning valve positione.

This information has not been given to other licensees or purchasera.

Yours very truly, Y N . S & OO -

O O lovell E. Eoe Vice Proaidant Qo

~

Facilition Develop =cnt D '9 I db b/19-20 v . b -.J

. 4 ALBA && M A. At 8 SMMA8 U4 46 eta *A gMA. v ,s a MA g h A U.AN A7 8 94 4 AMW e % A 4' M U * '.8 L8 l

1'9 y .**

.D t

~

T** l iMr** ' ~ ~ '

'~~4*'*^.,m.. -

_s . _ , . ,

,