ML19289D107

LER 78-074/03L-0 on 781229:noted That During Heat Balance Calculation surveillance(SP-312)an Excessive Quadrant Power Tilt Existed.Caused by Improper Selection of Temp Channel for Delta T Cold Control

ML19289D107
Person / Time
Site:	Crystal River
Issue date:	01/19/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289D106	List: ML19289D104 ML19289D107
References
LER-78-074-03L, LER-78-74-3L, NUDOCS 7901290235
Download: ML19289D107 (2)

Text

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,,3  ; Balance Calculation Curveillance (SP-312) an excessive quadrant power tilt; ,

o.. I existed. This event is contrarv to Technical Soecification 3.2.4. No I o is ; effect on public health and safety as quadrant power tilt was returned to 1 I within acceptable limits in 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 24 minutes. Two previous occurrences 36 2,,,  ; of this type.  ;

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SUPPLEMENTARY INFORMATION S

Report No.: 50-302/78-074/03L-0 Facility: Crystal River Unit #3 Report Date: 19 January 1979 Occurrence Date: 29 December 1978 Identification of Occurrence:

Quadrant Power Tilt exceeded the steady state limit contrary to Technical Specification 3.2.4, Table 3.2-2.

Conditions Prior to Occurrence:

Mode 1 power operation (74%), RCP-1B secured (due to low oil level).

Description of Occurrence:

At 0032, during performance of Heat Balance Calculation Surveillance (SP-312), it was discovered that a quadrant power tilt existed.

Three pump operation resulted in an improper ratio of feedwater flow. Feedwater was re-ratioed and the Delta T cold brought to zero. This condition resulted in a quadrant power tilt of 3.66 in the X-Y quadrant. The maximum quadrant power tilt reached 3.71.

It was discovered that the temperature channel used for Delta T cold control was selected to the idle loop. Upon switching to the proper channel and re-ratioing feedwater flow, the quadrant power tilt returned to within acceptable limits.

Designation of Apparent Cause:

The cause of this occurrence is attributed to the operator not selecting the proper temperature channel used for Delta T cold control.

Analysis of Occurrence:

The health and safety of the plant and general public were not endangered as surveillance was increased to closely monitor and control this event.

Corrective Action:

Revision to Operating Procedure 302, RC Pump Operation, is being implemented to prevent recurrence.

Failure Data:

Two previous occurrences of this type.

/rc