05000259/LER-1980-045-03, /03L-0:on 800602,at 80% Power,Hpci Failed to Meet Flow Requirements Because Turbine Stop Valve Tripped.Caused by Worn Mechanical Overspeed Trip Piston.New Parts Installed & Tested

/03L-0:on 800602,at 80% Power,Hpci Failed to Meet Flow Requirements Because Turbine Stop Valve Tripped.Caused by Worn Mechanical Overspeed Trip Piston.New Parts Installed & Tested

ML19320A937
Person / Time
Site:	Browns Ferry
Issue date:	06/27/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19320A932	List: 05000259/LER-1980-045, Forwards LER 80-045/03L-0 05000259/LER-1980-045-03, /03L-0:on 800602,at 80% Power,Hpci Failed to Meet Flow Requirements Because Turbine Stop Valve Tripped.Caused by Worn Mechanical Overspeed Trip Piston.New Parts Installed & Tested
References
LER-80-045-03L, LER-80-45-3L, NUDOCS 8007080297
Download: ML19320A937 (2)

LER-1980-045, /03L-0:on 800602,at 80% Power,Hpci Failed to Meet Flow Requirements Because Turbine Stop Valve Tripped.Caused by Worn Mechanical Overspeed Trip Piston.New Parts Installed & Tested

Event date:
Report date:
2591980045R03 - NRC Website

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EVENT 0 ATE 74 7s REPORT 0 ATE eu EV8ENT DESCRIPTION ANO PROB ABLE CONSEQUENCES h o 2 l With Unit 1 at 80 percent steady state power the Unit 1 HPCI failed to meet the i

o 3 l flow requirements of S.I. 4.5.E.1.d and e due to the inadvertent tripping of j

o 4 l the turbine stop valve. There was no danger to the health or safety of the public l

[5 TT] l and no resulting significant chain of events. See Technical Specification 3.5.E.1.

I o s l Previous similar occurrence reported on LER BFRO-50-259/80026.

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CAUSE OESCRIPTION AND CORRECTIVE ACTeONS h g i g o ; l Full hydraulic pressure suf ficient to open the stop valve did not develop l due to a worn mechanical overspeed trip piston. New improved replacement parts lwere installed and the test criteria satisfied during retest. Unit 2 has also been j

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Tenn:sse2 Valley Authority F:rm DF-17 Browns Ferry Nuclear Plant DF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION

3. 5. E.1 BFRO 259 / 80 45 Technical Specification Involved Reported Under Technical Specification 6.7.2.b (2)

Date of Occurrence 6/2/80 Time of Occurrence 1250 1

Unit Identification and Description of Occurrence:

While running S.I. 4.5.E.1.d & e,the HPCI failed to meet the flow requirements due to the inadvertatt tripping of the turbine stop valve.

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1 Conditions Prior to Occurrence:

Unit 1 - 80% steady state power.

l Unit 2 - 96% nteady state power.

Unit 3 - 100% steady state power.

Action specified in the Technical Specification Surveillance tiequirements met lLue to inoperable equipment.

Describe.

RCIC, Core spray, ADS logic, and RHR (LPCI) systems were proven operable.

api!,arent Cause of Occurrence:

Hydraulic pressure sufficient to open the stop valve did not develop due to_a worn mechanical overspeed trip mechanism piston.

Analysis of Occurrence:

There was no danger to health or safety of the public, no release of activity, no damago i

to plant or equipment, 'and no resulting significant chain of events.

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Corrective Action

New replacement parts were installed.

Failu re' Data:

LER BFRO-50-259/80045.

• Retention:

Period - Lifetime; Responsibility - Administrative Supervisor

• Revision: _ M g

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