05000289/LER-1978-010-01, /01T-0:on 780318,during Emergency Sequence & Power Transfer test,1A & 1C Makeup Pumps Tripped When Transferring to Onsite Source Due to Malfunctioning Time Delay Relay & Diesel Generators Failed to Start Due to Pressure Swit

/01T-0:on 780318,during Emergency Sequence & Power Transfer test,1A & 1C Makeup Pumps Tripped When Transferring to Onsite Source Due to Malfunctioning Time Delay Relay & Diesel Generators Failed to Start Due to Pressure Switches

ML19261F242
Person / Time
Site:	Crane
Issue date:	04/05/1978
From:	METROPOLITAN EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19261F237	List: 05000289/LER-1978-010, Forwards LER 78-010/01T-0 05000289/LER-1978-010-01, /01T-0:on 780318,during Emergency Sequence & Power Transfer test,1A & 1C Makeup Pumps Tripped When Transferring to Onsite Source Due to Malfunctioning Time Delay Relay & Diesel Generators Failed to Start Due to Pressure Swit
References
LER-78-010-01T, LER-78-10-1T, NUDOCS 7910250667
Download: ML19261F242 (2)

LER-1978-010, /01T-0:on 780318,during Emergency Sequence & Power Transfer test,1A & 1C Makeup Pumps Tripped When Transferring to Onsite Source Due to Malfunctioning Time Delay Relay & Diesel Generators Failed to Start Due to Pressure Switches

Event date:
Report date:
2891978010R01 - NRC Website

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o l The apparent cause for the MU Pump failure was a malfunctioning time delay relay in llow lube Oil trip circuit. The timers vill be replaced.

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Narrative

for Licensee Event Recort 78-lO/lT During the Emerger y Sequence and Power Transfer Test, Makeup Pu=ps 2A and 1C tripped on separate occasions. Tne test procedure requires simulating the undervoltage condition, which trips the ES hus feeder breakers causing actual loss of ES bus voltage. When the ES bus is tripped on the under-voltage condition, the =akeup pu=ps lose power and pu=p lube oil pressure.

During pu=p startup, there is a six second delay Defore the timer relay picks up.

This is to alls nor=al pu=p lube oil pressure to develop, which opens the lube oil pressure switch.

One of the pu=p trips occurred as a result of a failure of the timing relay to latch after being de-energined. Upon energining the bus, the timing relay picked up before the pu=p lube oil pressure switch opened. Tne other =akeup punp trip occurred as a result of a failure of the ti=ing relay to drop out after being de-energined in conjunction with loss of pu=p lube oil pressure.

.The d eup e ens would have operated satisfactorily on off-site power had an ES occurze However, operator intervention would have been required to restart the =ueup pu=ps if loss of off-site power occurred after an ES, as in the test sequence.

The ti=er relays will be replaced during the 1978 refueling outage.

The diesel start failure was previously identified by LER 7h-13 and LER 78-03 The OPLS pressure switch failed to operate before the cranking timers timed o t.

The pressure switches will be replaced during the 1978 Refueling outage, and the tests will be rerun.

M.U. Pu=p Ti=er GTE Sylvania, Clark Control Inc., AC pneu=atic ti=ing relay, Cat. No.17713UPE-76, 120 V AC coil, time delay:

0.2 seconds to 3 =inutes.

D.G. Pressure Switch Consolidated Control Corp., pressure range: 1 to 25 psi differential:

0.2 to 10 psi, 3ellows - phospher bronne Cat. No. 21A W 253-3.

.%ilure of the 1A diesel generator breaker to close was also noted in the pro =pt notification. Tnis failure resulted from the test method in that the switch handle =ust be released pro:M27 when it is removed from PULL-TO-LOCK or a trip signal occurs. Since the switch is not in FULL-TO-LOCK when the diesel is in standby, this problem is considered test related and is, therefore, not reportabl: