05000348/LER-1984-001, :on 840109,reactor Tripped Due to low-low Level in Steam Generator 1B.Caused by Low Bearing Oil Pressure Tripping Pump 1A.Automatic Rod Control to Be Repaired & Source Range Detectors Replaced

:on 840109,reactor Tripped Due to low-low Level in Steam Generator 1B.Caused by Low Bearing Oil Pressure Tripping Pump 1A.Automatic Rod Control to Be Repaired & Source Range Detectors Replaced

ML20086L659
Person / Time
Site:	Farley
Issue date:	02/03/1984
From:	Clayton F ALABAMA POWER CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-84-001, LER-84-1, NUDOCS 8402080350
Download: ML20086L659 (3)

LER-1984-001, on 840109,reactor Tripped Due to low-low Level in Steam Generator 1B.Caused by Low Bearing Oil Pressure Tripping Pump 1A.Automatic Rod Control to Be Repaired & Source Range Detectors Replaced

Event date:
Report date:
3481984001R00 - NRC Website

text

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At 2328 on 1/9/84, the reactor tripped due to LoLo level in IB steam generator.

This was a result of lA Steam Generator Feedwater Pump tripping due to low bearing oil pressure while the reactor was at 100% power. The low bearing oil pressure re-sulted f rom a trip of the operating AC lube oil pump motor due to an overload condi-tion.

IIcalth/ safety of the public was not af fected.

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mc r mr.nm During steady state operation with the unit in Mode I at 100% power, the operating AC lube oil pump motor for IA SGFP tripped due to an overload condi-tion. The backup AC lube oil pump started, as designed, preventing damage to the SGFP bearings. The plant operator took proper actions in an attempt to avert a reactor trip by ramping the turbine load down. After a few initial steps in, the rod control system failed preventing automatic or manual rod motion. The operator initiated a boration to maintain Reactor Coolant System temperature as the power decrease continued. At 2328 on 1/9/84, the reactor tripped when the level in IB steam generator reached the Lo Lo level setpoint.

The plant operators implemented FNP-1-EOP-5 (Reactor Trip) to place the unit safely in Mode 3.

As the power level decayed, the source range monitors energized when required, however, neither channel indicated any source range counts. The source range monitors were declared inoperable and the proper shutdown margin was verified in accordance with Tech. Spec. 3.3.1.

The cause for the operating AC lube oil pump motor tripping was the lube oil pump (SL,P) impeller rubbing against the pump casing which caused the motor to draw excessive running current. This was due to the impeller lift setting adjustment pin loosening and allowing the shaf t to move down. This excessive current resulted in an overload condition. The pump lif t was properly adjusted.

In addition, the lift settings on the remaining Unit 1 SGFP AC lube oil pumps were checked and minor adjustments made. Following adjustment, the motor run-ning currents were measured with satisfactory results. The Unit 2 motor running currents were also checked and found satisfactory.

The failare of the rod control system to produce rod motion was caused by an inhibit signal from the slave cycler card for power cabinet 2BD. During troubleshooting, it was determined that a problem exists in the automatic rod control circuitry (JD,CNV), which causes this inhibit signal to be generated.

Automatic rod control has been declared inoperable and will be repaired during the up coming cycle V-VI refueling outage, currently scheduled to begin on 2/10/84. This failure did not prevent the fulfillment of any safety function.

The failure of the source range channels to indicate auy source range counts was caused by failure of both source range detectors (IG,DET). The detectors were replaced. This failure did not prevent the fulfillment of any safety function.

FAILED COMPONENT IDENTIFICATION Component Manufacturer I.D. Number 1B SGFP lube oil pump Ingersol-Rand 3-EVT-1 Source range detectors Westinghouse WL 23706 Automatic rod control Westinghouse N/A circuitry groau au.

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m Alabama Power Company 600 North 98th Strrat Post Office Box 2641 Birmingham, Alabarna 35291 Telephone 205 783-6081 O

s F. L Clayton, Jr.

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AlabamaPbwer the souttum elocurc system February 3,1984 Docket No. 348 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Sir:

Joseph M. Farley Nuclear Plant, Unit 1, Licensee Event Report i:

No. LER 84-001-00 is forwarded in accordance with 10CFR50.73 to provide 30 day written notification of this occurrence. This report was prepared using a draft version of IEEE Std. 805-1984 since a final version has not been published.

If you have any questions, please advise.

Yours very tru M\\

/Q. L. Clayton, Jr.

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