ML19326A568

RO NP-33-77-21:on 770711,during Monthly Surveillance Test, Containment Spray Pump 1-1 Failed to Meet Pump Head Acceptance Criteria.Caused by Suction Pressure Indicator & Flow Transmitter Found Out of Calibr.Parts Recalibr

ML19326A568
Person / Time
Site:	Davis Besse
Issue date:	08/04/1977
From:	Batch S, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19326A527	List: ML19326A526 ML19326A568
References
NUDOCS 8002040742
Download: ML19326A568 (2)

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• DAVIS-BESSE UNIT ONE NL* CLEAR PO'ER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-77-21 DATE OF EVENT: July 11, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRE' ICE: Failure of Containment Spray Pump 1-1 to meet pump head acceptance criteria.

e Conditions Prior to O'currene_e_: The plant was in Mode 4 with Power (MWT) = 0

. and Load (M'K) = 0.

Description of Occurrence: On July 11, 1977, at 0005 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, Operations per-

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sonnel performed ST 5062.01, Containment Spray System Monthly Test, during which Containment Spray Pump 1-1 failed to meet the pump head acceptance cri-teria. The pump differential pressure _was 180.8 psid which is above the maxi-mum acceptance criteria of 179.5 psid. This placed the plant in the Action Statement of Technical Specification 3.6.2.1.

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. Designation of Apparent Cause of Occurrence: After investigation, it was found that the suction pressure indicator, PI-1591 and flow transmitter, FT-1547 were out of calibration. This was the reason that the indicated pump performance data exceeded its acceptance criteria.

Analysis of Occurrenca: Since the pump would have met its required flowrate under accident conditions, there was no threat to the health and safety of the i

l public or station personnel.

Correct'ive Action: After recalibration of the pressure indicators, the surveil-lance test was performed at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> en .Miy 12, 1977, and the pump met the - - - -

acceptance criteria. This removed the plant from the Action Statement of Techni-cal Specification 3.6.2.1. To prevent recurrence, the calibration frequency g will be increased as necessary to insure that these instruments remain within i their tolerances.

Failure Data: No previous similar events have occurred.

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