ML20042E681

LER 90-003-00:on 900323,automatic Start of Safeguards Cooling Water Pump Occurred Due to Inadequate Procedures. Plant Procedures Revised to Improve Guidance for Detecting Loss of prime.W/900423 Ltr

ML20042E681
Person / Time
Site:	Prairie Island
Issue date:	04/23/1990
From:	Hunstad A, Parker T NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-003-01, LER-90-3-1, NUDOCS 9004300181
Download: ML20042E681 (6)

Text

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North 9m States Power Company 414 Nicollet Mall-Minneapolis, Minnesota 55401 1927 =

. Telephone (612) 330 5500 April 23, 1990 10 CFR Part 50 Section 50.73 Director of Nuclear' Reactor Regulation U S Nuclear. Regulatory Commission Attn: Document Control Desk Washington, DC 20555 PRAIRIE ISLAND NUCLEAR CENERATING-PLANT Docket Nos. 50-282- License Nos. DPR-42 50 306 DPR 60 Automatic Start of a Safeguards Cooling Water Pump Caused by Inadeounte Procedures The Licensee Event Report for this occurrence 'is attached.

This event was reported via the Emergency Notification System in accordance with 10 CFR Part 50, Section 50.72, on March 23, 1990. Please contact us if you require additional information related to this event.

Thomas M Parker Manager Nuclear Support Services c: Regional Administrator - Regior,III, NRC NRR Project Manager, NRC

. Senior Resident Inspector, NRC MPCA Attn: Dr J W Ferman Attachment 9004300181 900423 <

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e:T uCT s uv N . , e . e On March 23, 1990, both units were operating at full power. The monthly operability test of No. 22 Diesel-Driven Cooling Water Pump was in progress.

Immediately prior to the event, No. 22 Diesel-Driven Cooling Water Pump was running (and supplying the cooling water header) and No. 21 Motor-Driven Coulitig Water Puriip was off. When No. 21 Motor-Driven Cocling Water Pump was restarted, some indications were that the pump was operating normally, so No. 22 Diesel-Driven Cooling Water Pump was prepared to be stopped, (Though indications were that No. 21 Motor-Driven Cooling Water Pump had assumed some cooling water load, in fact the pump was air bound and was not pumping.) When the speed of No. 22 Diesel-Driven Cooling Water Pump was reduced (in accordance with the procedure), cooling water header pressure dropped to the i setpoint for automatic start of the other Diesel-Driven Cooling Water Pump; No. 12 Diesel Driven Cooling Water Pump started at 0350. This was a non-ESF actuation of ESF equipment.

The cause of the event was procedural inadequacy. Plant procedures did not give adequate guidance for the operator to detect loss of prime in a cooling l water pump. The cause of the loss of prime of No. 21 Motor-Driven Cooling Water Pump was pump wear, allowing excessive air in leakage while it was idle.

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On March 23, 1990, both units were operating at full power. Prairie Island has 5 cooling water pumps.(EIIS Component Identifier: P):_ 3 non- safeguards motor-driven pumps (EIIS System Identifier Code:-KG) and 2 safeguards diesel-driven pumps (EIIS System Identifier Code: BI). The monthly operability test of No. 22 Diesel-Driven Cooling Water Pump was in progress. In this j test, No. 22 Diesel Driven Cooling Water Pump is started,' allowed to pick up some of the. cooling water system load, and then No._21-Motor Driven Cooling '

Water Pump is shut down. The diesel-~ driven cooling water pump is run for one-hour and then the motor driven cooling water pump is restarted and the diesel-driven cooling water pump shut down. Immediately prior to the event, No. 22 Diesel-Driven Cooling Water Pump was running (and supplying the cooling water header) and No. 21 Motor Driven Cooling Water Pump was off and No. 12 Diesel-Driven Cooling Water Pump was off. When No. 21 Motor Driven Cooling Water Pump was restarted, some indications were that the pump was operating-normally (even though it was not), so No. 22 Diesel-Driven Cooling Water Pump was prepared to be stopped. When the speed of No. 22 Dicael Driven Cooling Water Pump was reduced (in accordance with the procedure), cuoling water s header pressure dropped to the setpoint for automatic start of the other diesel-driven cooling water pump; No. 12 Diesel-Driven Cooling Water. Pump started at 0350. This was a non ESP actuation of ESF equipment.

The procedure asks the licensed control room operator to observe an increase in cooling water header pressure as an indication that the oncoming motor-driven cooling water pump has assumed some cooling water load. The control room operator observed a slight increase in cooling water header pressure, and-then a slight decrease was observed. The outplant operator stationed locally at the cooling water pumps reported that a cooling water strainer had just

entered its backwash cycle, an action that would explain the decrease in header pressure. .

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The procedure also asks the non-licensed operator to observe a temporary increase in speed of the diesel-driven cooling water pump as an indication that the motor-driven cooling water pump has assumed some of the cooling water load. The operator stationed locally reported he heard a temporary increase in speed.

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. - m,C r m. .nm Though observation of those two parameters (header pressure and engine speed) g indicated that No. 21 Motor Driven Coolihg Water Pump had assumed.some cooling l water load, in fact the pump was air bound and was not pumping. Therefore, i when the speed of No. 22 Diesel Driven Cooling Water Pump was reduced, header pressure dropped to the start setpoint of the other diesel driven cooling water pump. ,

No. 12 Diesel-Driven Cooling Water Pump was stopped and placed in AUTO at.

0530. No. 22 Diesel-Driven Cooling Water Pump was stopped and the surveillance test completed at 0625.

CAUSE OF THE EVENT *

, The cause of the event was procedural inadequacy. Plant procedures had been l revised as a result of a previous event (Unit 1 LER 87-008), but the revision l was not effective in preventing. recurrence. .The revision had asked the i operator to verify proper pump operation by observing secondary indicators of t j system response to starting a pump. Since those indicators can be affected by l other system perturbations, the indicators do not provide specific enough information to assure proper pump operation.

1 The cause of the loss of prime of No. 21 Motor-Driven Cooling Water Pump was pump wear, allowing excessive air in-leakage while it was idle.

ANALYSIS OF THE EVENT This event is reported under 10CFR50.73(a)(2)(iv),

The health and safety of .the public were not affected since the systems operated as expected.

j CORRECTIVE ACTION Procedures have been revised to improve guidance for detecting loss of prime.

The start setpoint for No. 121 Motor-Driven Cooling Water Pump, a non-safeguards backup pump, has been raised slightly to be sure it will start automatically before the diesel-driven cooling water pumps.

No. 21 Motor-Driven Cooling Water Pump will be replaced shortly after its replacement pump, which was ordered in 1989, is received.

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FAILED COMPONENT IDENTIFICATION No. 21 Motor-Driven Cooling Water Pump is a Vorthington type 16-LN-28. ,

centrifugal pump.

PREVIOUS SIMILAR EVENTS' ,

Previous similar events (cooling water pumps loss of prime) have been reported as Unit 1 LER's87-008 and 88-002,

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