05000271/LER-1979-031-03, /03L-0:on 791110,during Refueling/Maint Outage, Hangers RCIC-H-82 & HPCI-HD-67B Removed from Svc.Removal Unnoticed During Review.Caused by Personnel Error.Hangers Returned to Svc

/03L-0:on 791110,during Refueling/Maint Outage, Hangers RCIC-H-82 & HPCI-HD-67B Removed from Svc.Removal Unnoticed During Review.Caused by Personnel Error.Hangers Returned to Svc

ML19211A297
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	12/14/1979
From:	Conway W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19211A296	List: 05000271/LER-1979-031, Forwards LER 79-031/03L-0 05000271/LER-1979-031-03, /03L-0:on 791110,during Refueling/Maint Outage, Hangers RCIC-H-82 & HPCI-HD-67B Removed from Svc.Removal Unnoticed During Review.Caused by Personnel Error.Hangers Returned to Svc
References
LER-79-031-03L, LER-79-31-3L, NUDOCS 7912170329
Download: ML19211A297 (2)

LER-1979-031, /03L-0:on 791110,during Refueling/Maint Outage, Hangers RCIC-H-82 & HPCI-HD-67B Removed from Svc.Removal Unnoticed During Review.Caused by Personnel Error.Hangers Returned to Svc

Event date:
Report date:
2711979031R03 - NRC Website

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LICENSEE EVENT REPORT LER 79-31/3L CONTROL BLOCK: l l

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NAME OF PREPARER

T VTVYS1 05000271 LER 79-31/3L EVENT DESCRIPTION AND PROBABLE CONSEQUENCES During the continuing effort to determine and insure the adequacy of the Seismic Class I hangers, as described in the NRC Bulletin 79-02, hangers SW-R-76, RCIC-H-82, and HPCI-HD-67B were removed from service during the post Fall Refueling / Maintenance Outage.

Prior to the sche-duled plant startup, all outstanding items were reviewed for their affect on system operability.

These three hangers went unnoticed during the review.

Tech. Spec. Section 3.6.I.1 requires that all seismic hangers be operable during power operation (based on interpretation as-sociated with RO 79-15). As allowed by Tech. Spec. Section 3.6.I.2, all hangers were repaired within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time period.

There have been no similar occurrences reporte'd to the Commission.

CAUSE DESCRIPTION AND CORRECTIVE ACTION 3 The cause of this occurrence is the f ailure to recognize that a seismic restraint was not returned to service prior to plant startup.

The affected hangers were returned to service within the required 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> following the discovery. Appropriate personnel were reinstructed on the requirements for hanger operability and the necessity to perform more careful reviews of the documentation.

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