ML20039F748

LER 81-032/03L-0:on 811205,boric Acid Transfer Pump a Tripped & Was Declared Inoperable.Caused by Error in Valve Lineup Procedure & Open Winding in Transfer Pump Motor. Procedure Revised & Motor Replaced

ML20039F748
Person / Time
Site:	Robinson
Issue date:	01/04/1982
From:	Cox H CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20039F734	List: ML20039F733 ML20039F748
References
LER-81-032-03L-01, LER-81-32-3L-1, NUDOCS 8201130297
Download: ML20039F748 (2)

Text

NRC FORM 366 U.S. NUCLEAR RECULATO3Y COMMISSION (7 77)

• LICENSEE EVENT REPORT CONTROL ELOCK: l l l l l lh 6

(PLEASE PAINT C3 TYPE ALL REQUtRED INFORMATION) 1 l68l@

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7 8 60 61 DOCKET NUMBER 68 69 EVEN T OATE 74 REPORT DAT E EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 10n December 5,1981, a t 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br /> with the unit at 64% power. "A" Boric Acid (BA) l o 3 l Transfer Pump tripped and was declared inoperable. The pump trip was caused by an l o 4 l error in Valve Lineup Procedure OP-28-3-A which specified valve CVC-338 ("A" BA l 0 3 l Transfer Pump Suction) be closed causing cavitation of the pump. This event resulted l 0 s l in operation in a degraded mode permitted by a limiting condition as defined by l 0 7 l Technical Specification 3.2.3.b which is reportable pursuant to 6.9.2.b.2. The 1 0 g l redundant BA pump was operable s0 there was nO threat to the public health and safety. l SYST E M CAUSE CAUSE COMP. VALVE

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33 34 35 M 31 40 41 42 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l"A" BA Transfer Pump motor was found to have an open winding and was replaced. The l i l pump was tested and declared operable at 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on December 5 1981. The l

, , l defective procedure, OP-28-3-A, was revised on December 11. 1981, to include the l

, 3 l correct position of valve CVC-338. NO further action is considered necessary. l i A l l 7 a 9 80 ST  % POWE R OTHER ST ATUS IS O RY DISCOVERY DESCRIPTION i s W @ l0l6l4l@l NA l l A l@l Opera tor Observa tion l ACTIVITY CO TENT REtEASEo or HELEASE AMOUNT OF ACTIVITY LOCATION oF RELEASE 7

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SUPPLEMENTAL INFORMATION FOR l

LICENSEE EVENT REPORT 81-032

1. Cause Description and Analysis:

On December 5,1981, at 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br /> with the unit at 64% power, "A" Boric Acid (BA) Transfer pump tripped during the recirculation of "A" BA Storage Tank for routine sampling. The pump was immediately declared inoperable.

Investiga tion of this event revealed that prior to 0554 hours0.00641 days <br />0.154 hours <br />9.160053e-4 weeks <br />2.10797e-4 months <br /> on December 5,1981, a transfer operation from the BA Batching Tank to "A" BA Storage Tank had been performed by the night operating shif t with the valve lineup in accordance with Operating Procedure OP-28-3-A. "A" BA Storage Tank was then placed in recirculation by the next shift crew. The Valve Lineup Procedure OP-28-3-A had recently been revised, was being used for the first time, and contained a typographical error in that it specified valve CVC-338

("A" BA Transfer Pump Suction) be " closed" instead of "open".

This error had no effect on the transfer operation; however, the

- error did result in no flow, pump overheating, and subsequent pump trip at 0850 hours0.00984 days <br />0.236 hours <br />0.00141 weeks <br />3.23425e-4 months <br /> during the recirculation operation performed by the next shift.

This event resulted in operation in a degraded mode permitted by a Limiting Condition as defined by Technical Specification 3.2.3.b which is reportable pursuant to 6.9.2.b.2. The redundant BA Transfer Pump was operable so there was no threat to the public health and safety.

2. Corrective Action:

"A" BA Transfer Pump motor was found to have an open winding as a result of the overheating. The motor was replaced and the pump was tested and declared operable at 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on December 5,1981.

3. Corrective Action to Prevent Recurrence:

The defective procedure, OP-28-3-A, was revised on December 11, 1981, to include the correct position of valve CVC-338. The typographical error is believed to be an isolated case and no further action is considered necessary.