05000346/LER-1977-017-01, /01T-0:on 771020,both Auxiliary Feed Pump Suctions Lined Up to Deaerator Storage Tanks W/O Cooling Water Supply Shifting to Svc Water,Resulting in Water Greater than 200 F as Cooling Water for Auxiliary Feed Pump Bearings

/01T-0:on 771020,both Auxiliary Feed Pump Suctions Lined Up to Deaerator Storage Tanks W/O Cooling Water Supply Shifting to Svc Water,Resulting in Water Greater than 200 F as Cooling Water for Auxiliary Feed Pump Bearings

ML19329B907
Person / Time
Site:	Davis Besse
Issue date:	11/01/1977
From:	Chesko R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B766	List: 05000346/LER-1977-017, Forwards LER 77-017/01T-0 05000346/LER-1977-017-01, /01T-0:on 771020,both Auxiliary Feed Pump Suctions Lined Up to Deaerator Storage Tanks W/O Cooling Water Supply Shifting to Svc Water,Resulting in Water Greater than 200 F as Cooling Water for Auxiliary Feed Pump Bearings
References
LER-77-017-01T, LER-77-17-1T, NUDOCS 8002060899
Download: ML19329B907 (3)

LER-1977-017, /01T-0:on 771020,both Auxiliary Feed Pump Suctions Lined Up to Deaerator Storage Tanks W/O Cooling Water Supply Shifting to Svc Water,Resulting in Water Greater than 200 F as Cooling Water for Auxiliary Feed Pump Bearings

Event date:
Report date:
3461977017R01 - NRC Website

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.i2 42 44 47 CAUSE DESCRIPTION AND CCRRECTIVE ACTIONS l i i o l l The cause of this occurrence is personnel error. At 0139 hours0.00161 days <br />0.0386 hours <br />2.29828e-4 weeks <br />5.28895e-5 months <br /> on October 20, 1977, ;

li1ij l an operator improperly lined up the Startup Feed Pump to run with suction from the I

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t 21 1 Deaerator Storage Tanks through W 85 instead of W 32.

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DVR 145-1 Rich Chesko

.a TOLEDO EDISON COMPANY b' '

DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-17 DATE OF EVENT: October 20, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Improper cooling water supply to both Auxiliary-Feed Pumps due to pump suction being aligned to deaerators and cooling water not being shifted to Service Water.

Conditions Prior to Occurrence: The plant was in Mode 1, with Power (MWI) = 166, and Load (MWE) = 0.

Description of Occurrence: At 1150 hours0.0133 days <br />0.319 hours <br />0.0019 weeks <br />4.37575e-4 months <br /> on October 20, 1977, it was discovered that both Auxiliary Feed Pump (AFP) suctions were lined up to the Deserator Storage Tanks (DST) without the cooling water supply beiag shifted to Service Water. This lineup provided greater than 200 F water as cooling water for the Auxiliary Feed 0

Pump Turbine bearings. This rendered both Auxiliary Feed Pumps inoperable placing the station in violation of Technical Specification 3.7.1.2.

O At 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on October 20, 1977, the lineup was shifted by closing W 85 to have both AFP's taking their suction from the Condensate Storage Tanks instead of the DST, thus restoring the cooling water. supply and removing the station from the Action Statement.

Designation of Apoarent Cause of Occurrence: The cause of this occurrence is per-sonnel error. At 0139 hours0.00161 days <br />0.0386 hours <br />2.29828e-4 weeks <br />5.28895e-5 months <br /> on October 20, 1977, an operator improperly lined up the Startup Feed Pump to run with suction from the DST's through W 85 instead of W 32.

This allowed the hot water to be lined up to the AFP's.

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Analysis of Occurrence: There was no threat to the health and safety of the public or to station personnel. If the AFP's were called upon (which they were not), they would have automatically started and performed their safety function. Since the hot water from the Demerator Storage Tanks would not provide adequate cooling for continuous running of the Auxiliary Feed Pumps without some additional operator action, both AFP's were considered inoperable. However, the installed bearing temperature alarms would have alerted the Control Room Operator of the problem soon after starting the pumps as the hot water would have allowed the bearing oil temperature to reach the alarm setpoint. At this time shifting of the cooling water supply or the closing of W 85 would have eliminated the problem.

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-32-77-17 PAGE 2

Corrective Action

The valve W 85 was locked closed and a procedure modification was issued to the AFP Monthly Surveillance Test, ST 5071.01, to add W 85 as locked closed to the Valve Verification List.

Failure Data: There have been no previous occurrences caused by improper cooling water lineup to the Auxiliary Feed Pumps.

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