ML20064D805

/03X-1 on 780909:during Surveillance Test FNP-1- STP-22.0,the Turbine Driven Auxiliary Feedwater Pump Failed to Start When Trip/Throttle Valve Tripped Shut & Control Was Lost on Valves 3228A,B,C,due to Failed Tdafpcircuit Relay

ML20064D805
Person / Time
Site:	Farley
Issue date:	11/02/1978
From:	Hairston W ALABAMA POWER CO.
To:
Shared Package
ML20064D802	List: ML20064D798 ML20064D805 ML20064D809 ML20064D817 ML20064D824
References
LER-78-064-03X, LER-78-64-3X, NUDOCS 7811090187
Download: ML20064D805 (3)

Text

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• 4 WRC F oRM 366 U. S. NUCLEAR REGULATORV CON #tSSION (777t Update Report LICENSEE EVENT REPORT Previous Report Date 10/10/78 CONTROL BLOC 8C: l i

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7 8 60 6 DOC K ET w'.80 g m EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h g l While performing surveillance test procedure FNP-1-STP-22.0, Turbine Driven Auxiliary l lolal l Feedwater Pump (TDAFP) Operability Test, the TDAFP failed to start when the trip / l gol4l l throttle valve tripped shut. When subsequently started, control was lost on flow l o 5 l control valves 3228A, B, C except in the bypass mode, and the TDAFP would not stop l l 0 l6 l l unless the control switch was held in the stop position. When control was lost, the l l o l 7 l l TDAFP was tripped loc illy. The TD.TP was declared inoperable at 1000 on 9/9/78 and wa9 gojaj j returned to an operable status at 2230 on 9/9/78. T/S 3.7.1.2 action statement requirg-a0 7 s 9 ments were met. Health / Safety of public was not affected.

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, 3 l the valve to open on subsequent attempts was due to the overloads being open. Loss ofg

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_ . _ _ . _ _ .__ _ NAVE OF_ PREP ARE R _

ALABA'!A POWER COMPANY JOSEPH M. FARLEY NUCLEAR PLANT DOCKET NO. 50-348 ATTAC101ENT TO LER 78-064/03X-1 Facility: Joseph M. Farley Unit 1 Report Date: (Update Report - Previous Report Date 10/10/78)

Event Date: 9/9/78 Identification of Event While performing Surveillance Test Procedure FNP-1-STP-22.0, the Turbine Driven Auxiliary Feedwater Pump (TDAFP) failed to start when the trip / throttle valve tripped shut; after starting, control was lost on flow control valves 3228A, B, C except in the " bypass" mode, and the TDAFP would not stop unless the control switch was held in the "stop" position.

Conditions Prior to Event The Unit was in Mode 1 operating at 100% steady state power.

Description of Event On 9/9/78 while performing Surveillance Test Procedure FNP-1-STP-22.0, Turbine Driven Auxiliary Feedwater Pump Operability Test, the TDAFP failed to start when the trip / throttle valve went shut as the

, reactor operator attempted to start the pump. A "TDAFP Fault" alarm was received. The Assistant Plant Operator at the pump observed a

" turbine overspeed" light had come on, and reset it by pulling the trip / throttle valve (MOV-3406) trip linkage back toward the MOV.

The "TDAFP Fault" alarm did not clear. The Plant Operator checked l the Balance of Plant Panel trip / throttle valve switch and had no I indication (the switch was in the open position). The Plant Operator then placed the switch in the closed position, then returned it to the open position. The "TDAFP Fault" alarm still did not clear.

The Plant Operator then placed the TDAFP control switch to the stop position and verified valves 3235A and 3226 (Steam Supply Valves) closed.

The Plant Operator went to the pump and found the trip / throttle valve closed. He attempted to open the valve using the local pushbuttons. Failing to do so, he then opened the valve manually.

The Plant Operator returned to the Control Room and found the "TDAFP Fault" alarm cleared.

The Plant Operator started the TDAFP and flow control valves 3228A, B, C opened. These valves should have remained closed for the performance of the Surveillance Test. The Plant Operator could not 1

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- 78-064/03X-1 position the valves except in the " bypass" de. When attempting to stop the TDAFP, the Plant Operator disc < red that the pump

.<ould not stop unless the TDAFP control switch was held in the stop position (indicative of an auto-start signal, which was not present).

The Plant Operator had the Assistant Plant Operator trip the pump locally. Subsequent attempts to open the trip / throttle valve from the local panel and the Balance of Plant Panel were unsuccessful.

The TDAFP was declared inoperable at 1000 on 9/9/78, and was returned to an operable status at 2230 on 9/9/78.

Designation of Apparent Cause 2

The cause of the trip / throttle valve going shut during the initial attempt to start the pump was not determined. The failure of the trip / throttle valve to open on subsequent attempts to operate the valve from the local panel was due to the thermal overloads being open. A defective relay in the TDAFP control circuitry at the Hot Shutdown Panel caused the loss of control of flow control valves

] 3228A, B, C and the TDAFP.

Analysis of Event The TDAFP trip / throttle valve could have been manually opened, if required. The failure of the relay would not have prevented the TDAFP from performing its intended function since the flow control valves failed open and their position could have been varied while in the " bypass mode". The TDAFP was returned to an operable status within the time limit specified in Technical Specification 3.7.1.2.

The Technical Specification 3.7.1.2 action statement requirements were complied with. This occurrence had no effect on the health and safety of the general public.

Effect on Plant This occurrence had no significant effect on plant operations. ,

Corrective Action The TDAFP trip / throttle valve thermal overloads were reset, restoring local control of the valve. The defective relay in the TDAFP i

control circuitry in the Hot Shutdown Panel was replaced, and proper operation of the flow control valves verified. Surveillance Test Procedure FNP-1-STP-22.0 was satisfactorily completed.

Failure Data A similar occurrence (failure of the TDAFP to start) was reported in LER 78-021/0lT-0.

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