ML19321A969

Part 21 Rept Re Defective Terry Turbine Co HPCI Turbine. Caused by Machining Error in Fabrication of Mechanical Overspeed Trip Valve Body Assembly Which Resulted in HPCI Remaining in Tripped Condition.Valve Body Replaced

ML19321A969
Person / Time
Site:	Browns Ferry
Issue date:	06/30/1980
From:	Parris H TENNESSEE VALLEY AUTHORITY
To:
References
REF-PT21-80-246-000 NUDOCS 8007240455
Download: ML19321A969 (3)

Text

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LPDR TERA TERA ACTION:

PRELIMINARY EVALUATION OF THE ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FOR FOLLOWUP AS SHOWN BELOW:

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.f TENNESSEE VALLEY AUTHORITY CH ATTANOOGA TENNESSEE 3740,< R C RF.4. * *

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June 30, 1980

- {; j lj 't' P1 30 gd c2V6-oo o Mr. James P.-O'Reilly, Director U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

PART 21 REPORT FOR MATERIAL DEFECT AT BR0k".;S FERRY NUCLEAR PLANT On June 4,1980, it was discovered that a new replacement part for the high-pressure coolant inj ection - (HPCI) system at Browns Ferry Nuclear Plant. contained a manufacturing defect. Due to a machining error, the i HPCI mechanical overspeed trip valve body would not allow sufficient oil pressure .to develop within the valve body. If undetected, the defect would have caused HPCI to remain in a tripped condition. This defect has been detemined to be reportable under Part 21.

The enclosed Part 21 report contains further information about the

. problem and associated corrective action.

Very truly yours, TENNESSEE VALLEY AUTHCRITY

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N

d. G. Parris Manager of Power Enclosure OFFICIAL COPY An Equal Opportunity Employer

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Attacirnent 1 o

pal:T "1 RECOPJ[

P3 2nt Browns Ferry Nuclear Plant Cc=ponent or Gysten. Identification EPCI - turbine Supplier of Component Terry Turbine Company IIature of Defect or iloncompliance A caching error was made fabricating the mechanical overspeed trip valve body assembly.

L: tent of Snfety Hnnard This nachining error would not allow sufficient oil pressure to develop within the valve body, resulting __

in the HPCI remaining in a tripped condition.

Date which' Defect or Noncompliance 1:a: Diceovered 6/4/80

=ber of Identical Cc=ponents In Une 2

'. cation of Components units 2 and 3 FPCI turbines Ccrrective Act.iot, TcLen rrxiXXXXXX:CCCL Valve body was replaced with a unit properly _ fabricated.

Length of Time T:e 1: ired To Cccplcte Action 24 man-hours IIas defect or noncompliance been reported previously? Yes l l No R If yes, by whr.t means?