05000259/LER-1980-026-03, /03L-0:on 800322,HPCI Stop Valve Would Not Open Completely.Caused by Worn Mechanical Overspeed Trip Piston. Hydraulic Sys Adjusted & Stop Valve Tested

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/03L-0:on 800322,HPCI Stop Valve Would Not Open Completely.Caused by Worn Mechanical Overspeed Trip Piston. Hydraulic Sys Adjusted & Stop Valve Tested
ML19309F196
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 04/18/1980
From:
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309F193 List:
References
LER-80-026-03L-01, LER-80-26-3L-1, NUDOCS 8004280598
Download: ML19309F196 (2)


LER-1980-026, /03L-0:on 800322,HPCI Stop Valve Would Not Open Completely.Caused by Worn Mechanical Overspeed Trip Piston. Hydraulic Sys Adjusted & Stop Valve Tested
Event date:
Report date:
2591980026R03 - NRC Website

text

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Browns Ferry Nuclear Plant BF !T 2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 259 / _8026 Tecnnical Specification Involved T.S.4.5.E.2 Reported Under Trchr.ieal S;:ecification T.S. 6.7.2.b (2)

Date of Occurrence 3/22/80, Time cf occurrence 1230 Unit 1

Identification and Description ~of Occurreface: During the running of SI 4. 5.E.1, d & e, the HPCI stop valve would not open completely.

i Conditions ' Prior to Occurrence:

Unit 1 - ready for startup from refueling outage.

Unit 2 - 75% steady state power.

Unit 3 - 98% steady state power.

Action specified in the Technical Specification Surveillance Requirements mat duc to inoperable equipment. Describe.

Redundant systems were operable - RCIC, RHR, Core Spray, and ADS were available.

Apparent Cause of Occurrence:

Full hydraulic pressure sufficient to open the stop valve did not develop due to a worn mechanical overspeed trip piston.

Analysis of O.'currence,:

No danger to health or safety of the public; no damage to plant or equipment; no release of activity.

Corrective Action

' Adjustments were made to the hydraulic system of the stop valve and stop valve tested. Replacement parts are being procured to upgrade integrity of the system.

Fjlure Data:

N/A

  • Retention :

eriod - Lifetime: Responsibility - Administrative Supervisor

  • Revision :

N/

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