05000346/LER-1978-090-03, /03L-0:on 780813,makeup Pump 1-2 Declared Inoperable Due to Excessive Oil Leakage from Inboard Reflector Disk.Caused by Personnel Leaving Sealant Around Disc,Preventing Proper Oil Seal.Pump Cleaned & re-assembled

/03L-0:on 780813,makeup Pump 1-2 Declared Inoperable Due to Excessive Oil Leakage from Inboard Reflector Disk.Caused by Personnel Leaving Sealant Around Disc,Preventing Proper Oil Seal.Pump Cleaned & re-assembled

ML20147A781
Person / Time
Site:	Davis Besse
Issue date:	09/06/1978
From:	Baltz J, Hartigan J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20147A775	List: 05000346/LER-1978-090, Forwards LER 78-090/03L-0 05000346/LER-1978-090-03, /03L-0:on 780813,makeup Pump 1-2 Declared Inoperable Due to Excessive Oil Leakage from Inboard Reflector Disk.Caused by Personnel Leaving Sealant Around Disc,Preventing Proper Oil Seal.Pump Cleaned & re-assembled
References
LER-78-090-03L, LER-78-90-3L, NP-33-78-107, NUDOCS 7809180321
Download: ML20147A781 (2)

LER-1978-090, /03L-0:on 780813,makeup Pump 1-2 Declared Inoperable Due to Excessive Oil Leakage from Inboard Reflector Disk.Caused by Personnel Leaving Sealant Around Disc,Preventing Proper Oil Seal.Pump Cleaned & re-assembled

Event date:
Report date:
3461978090R03 - NRC Website

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NRC FORM 366 (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1

[6 TT1 1 on 8/13/78, Makeup Pump 1-2 was declared inoperable due to excessive oil leakage from l

Since the pump was declared inoperable, the unit was l

l [517) } the inboard' deflector disc.

l rb T71 I placed in the action statement of T.S. 3.1.2.4, which requires two makeup pumps in Modes 1, 2, 3 and 4.

There was no danger to the health and safety of the public or l

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The redundant makeup pump was operable.

(NP-33-78-107)

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-107 DATE OF EVENT: August 13, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Makeup Pump 1-2 declared inoperable due to excessive inboard deflector disc oil leakage 4

The unit was in Mode 1, with Power (MWT) = 2080, Conditions Prior to Occurren'e:

and Load (MWE) = 292.

Ai 1018 hours0.0118 days <br />0.283 hours <br />0.00168 weeks <br />3.87349e-4 months <br /> on August 13, 1978, Makeup Pump 1-2 was Description of Occurrencq:

dec2 red inoperable due to excessive oil leakage from the inboard deflector disc.

i' Since the pump was declared inoperable, the unit was placed in the action state-ment of Technical Specification 3.1.2.4, which requires two makeup pumps in Modes 1,'2, 3 and 4.

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The cause of this occurrence is per-Designation of Apparent Cause of Occurrence:

Work was done on the pump on August 8,1978 under Maintenance Work sonnel error. to investigate inboard bearing temperatures that would not stabilize.

Order 78-1860 After disassembly'and-inspection of the bearing, no abnormal conditions were found and the bearing was reassembled.

On August 13, 1978, an equipment operator found a low oil level in the reservoir sight glass for the pump oil system. Upon investigation by maintenance personnel, Further a fine mist of oil was being discharged around the inboard deflector disc.

78-2051 revealed small quantities of a investigation under Maintenance Work Order sealant -(RTV-106) around the inboard deflector disc which prevented a proper oil seal.

l There was no danger to the health and safety of the public Analysis of Occurrence:

or to unit personnel. The redundant makeup pump was operable.

Corrective Action

Under Maintenance Work Order 78-2051, the pump was cleaned, J

ieassembled, and restored to operability.on August 16, 1978 at 0245. hours. This A note has is within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time limit of Technical Specification 3.1.2.4.

- been added to procedure MP 1410.22, " Removing and Replacing Makeup Pump Bearings, Mechanical Seals and End Covers" to apply sealant sparingly to the horizontal bear-

'ing housing joints.

There has been one previously reported makeup pump oil leak but the

' Failure Data:

cause of the occurrence was a design deficiency.

See Licensee Event' Report NP-33-77-73 for further details.

1 LER #78-090

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