05000269/LER-1978-021-01, /01T-0:on 780914,during Review of Calibr Data Following Annual Surveillance Testing,Transmitters PT-4 & PT-6 Were Nonconservatively Out of Calibr.Caused by Excessive Temp & Humidity within Penetration Room

/01T-0:on 780914,during Review of Calibr Data Following Annual Surveillance Testing,Transmitters PT-4 & PT-6 Were Nonconservatively Out of Calibr.Caused by Excessive Temp & Humidity within Penetration Room

ML19317E290
Person / Time
Site:	Oconee
Issue date:	09/28/1978
From:	Ken Wilson DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19317E288	List: 05000269/LER-1978-021, Forwards LER 78-021/01T-0 05000269/LER-1978-021-01, /01T-0:on 780914,during Review of Calibr Data Following Annual Surveillance Testing,Transmitters PT-4 & PT-6 Were Nonconservatively Out of Calibr.Caused by Excessive Temp & Humidity within Penetration Room
References
LER-78-021-01T, LER-78-21-1T, NUDOCS 7912170516
Download: ML19317E290 (2)

LER-1978-021, /01T-0:on 780914,during Review of Calibr Data Following Annual Surveillance Testing,Transmitters PT-4 & PT-6 Were Nonconservatively Out of Calibr.Caused by Excessive Temp & Humidity within Penetration Room

Event date:
Report date:
2691978021R01 - NRC Website

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DUKE POWER COMPANY OCONEE UNIT 1 Report Number: RO-269/78-21 Report Date,: September 28, 1978 Occurrence Date:

September 14, 1978 Facility:

Oconee Unit 1, Seneca, South Carolina Identification of Occurrence:

Reactor Building Pressure Transmitter Out-of-Calibration Conditions Prior to Occurrence: Refueling Shutdown Description of Occurrence:

During the annual surveillance testing, on September 8, 9, 1978, Engineered Safeguards (ES) Channels 1 and 3, Reactor Building Pressure Transmitters (PT-4, ~6) were calibrated.

During a review of the calibration data on September 14, 1978, it was determined that both channels had been out of calibration in the non-conservative direction.

Cause of Occurrence:

The apparent cause of the occurrence was extreme temperature and humidity conditions within the penetration room.

These conditions caused the trans-mitter 'zero' point to shift.

A valve, with a body to bonnet leak which caused the extreme conditions, has been replaced.

Analysis of Occurrence:

The calibration data indicated that ES Channel 1 would have tripped at 4.426 psig; lhannel 3 would have tripped at 4.225 psig.

Channel 2 was also oper-able with a trip setpoint of 3.4 psig.

The required ES actuations (HPI, LPI, RB cooling initiation) would have occurred in the event of a postulated accident with no significant delay time.

It is thur, concluded that the health and safety of the public were not endangered.

Corrective Action

The transmitters had been calibrated prior to the determination that the transmitters were non-conservative.

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