ML19262C594

LER 80-010/03L-0:on 800110,recirculation Loop Temp Instruments Found Out of Calibr.Caused by Use of Wrong Type of Test Signal in Previous Calibr.Problem Corrected by Recalibr

ML19262C594
Person / Time
Site:	FitzPatrick
Issue date:	02/09/1980
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19262C587	List: ML19262C586 ML19262C594
References
LER-80-010-03L, LER-80-10-3L, NUDOCS 8002140604
Download: ML19262C594 (2)

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I Durine Surveillance Testinn Recirculation Loop Temperature Instruments  !

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• POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 80-010/03L-0 Page 1 of 1 s . . . .

During normal operation, while performing Instrument Surveillance Procedure F-ISP-78, titled " Recirculation Pump Temperature Instrument Calibration," recirculation system temperature instruments 02-MV/I-150A and 150B were found out of calibration in the non-conservative direction.

The instruments which were out of calibration are part of the instrument loop which provides indication of recirculation system loop temperatures.

These temperature indications are used along with other temperature instrumentation, to determine the temperature difference between the recirculation loop and the reactor vessel. Technical Specifications Paragraph 3.6.A.3. requires that an idle recirculation loop shall not be placed in service unless the coolant temperature in the idle recirculation loop is within 50 F. of the reactor coolant temperature in the reactor vessel. F-ISP-78 specifies an accuracy tolerance for the instruments of concern of + 2%. During performance of F-ISP-78 the instruments were four reading between 5 and 6% high. This error could result in startup of an idle recigculation loop with an actual temperature difference of greater than 50 F. A review of operating recoras since the last calibration of the same temperature instruments did not reveal any instance in which an idle 5ecirculation loop was placed in service with a differential temperature of 50 F. when the calibration error is considered. Therefore, the event did not represent a significant hazard to the public health and safety.

The instruments were recalibrated and returned to service. To preclude recurrence, the event has been discussed with personnel that perform the calibrations and the importance of using the proper test signals was stressed.

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