05000346/LER-1978-026-03, /03L-0:on 780309,radiation Monitor Re 5029 Found Inoperable Due to Low Sample flow.12 Previous Radiation Monitor Inoperabilities Not Reported.Caused by Pump Motor Bearing Seizure Due to High Ambient Temp

/03L-0:on 780309,radiation Monitor Re 5029 Found Inoperable Due to Low Sample flow.12 Previous Radiation Monitor Inoperabilities Not Reported.Caused by Pump Motor Bearing Seizure Due to High Ambient Temp

ML19329B903
Person / Time
Site:	Davis Besse
Issue date:	04/05/1978
From:	Nelson J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19329B895	List: 05000346/LER-1978-026, Forwards LER 78-026/03L-0 05000346/LER-1978-026-03, /03L-0:on 780309,radiation Monitor Re 5029 Found Inoperable Due to Low Sample flow.12 Previous Radiation Monitor Inoperabilities Not Reported.Caused by Pump Motor Bearing Seizure Due to High Ambient Temp
References
LER-78-026-03L, LER-78-26-3L, NUDOCS 8002060896
Download: ML19329B903 (3)

LER-1978-026, /03L-0:on 780309,radiation Monitor Re 5029 Found Inoperable Due to Low Sample flow.12 Previous Radiation Monitor Inoperabilities Not Reported.Caused by Pump Motor Bearing Seizure Due to High Ambient Temp

Event date:
Report date:
3461978026R03 - NRC Website

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60 61 DOCKET NUveER 6a 69 EVENT DATE 74 75 REPCRT QATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h t o t a l l On 3/9/78, Post Accident Radiation Monitor RE 5029 was found inoperable due to low I

gl sat:ple flow ~. This placed the unit in the Action State =ent of T.S. 3.3.3.6 which jo;,i l requires the =onitor to be repaired within 30 days while in Modes 1, 2 or 3.

During l 1oisl l the preparation of this report, it was discovered 12 previous inoperabilities of Post l l o 16 l 1 Accident Radiation Monitors had occurred but were Tiot reported. There was no danger l l0l7l l to the health and safety of the public or unit persCnnel. These instruments do not l

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It was decided to' replace the motor bear-l g,,3g l ing's with a sealed type bearing. FAT.IIR Part No. 203 PP and 205PP.

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATIO:*

s SUPPLEMENTAL INFORMATION FOR LER NP-33-78-30 DATE OF EVENT: March 9, 1978 FACILITY:

Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Post Accident Radiation Monitor RE 5029 Failure Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2080

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and Load (MWE) = 727.

Description of Occurrence: On March 9,1978, Post Accident Radiation Monitor RE 5029 was found inoperable due to low sample flow as indicated on pump panel RCM 5029. This placed the unit in the Action Statement of Technical Specifica-tion 3.3.3.6, which requires the functional unit to be repaired in 30 days.

The Technical Specification requires both Post Accident Radiation Monitors while in Modes 1, 2 or 3.

During the preparation of this report,.it was recognized that nu=erous previous failures had occurred but had not been reported.

.12ut following list is the dates on which RE 5029 and RE 5030 have been inopera-ble, returned to operability by completion of Surveillance Test ST 5032.01,

" Radiation Monitor Functional Test", and the duration of each occurrence.

DATE DATE RETURNED DURATION MONITOR INOPERABLE TO OPERABILITY OF OUTAGE RE 5029 7/15/77 8/3/77 19 days RE 5029 8/15/77 8/17/77 2 days RE 5029 8/31/77 9/22/77 22 days RE 5029 10/5/77 10/23/77 17 days RE 5029 11/7/77 11/18/77 11 days RE 5029 11/23/77 12/13/77 20 days RE 5029 1/16/78 2/6/78 21 days RE 5029 2/7/78 3/6/78 27 days RE 5030 7/9/77 7/10/77 1 day RE 5030 9/19/77 10/13/77 24 days RE 5030 11/14/77 12/5/77 21 days RE 5030 12/8/77 12/12/77 4 days Desienation of Aeoarent Cause of Occurrence:

The apparent cause of the incident on March 9,1978, is due to pu=p motor (Reliance Part #14G4025-A5) bearing seizure.

This seizure is believed to be caused by the high anhient tenperature conditions inside the radiation monitor cabinet which contains the entire monitor.

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DDAVIS-BESSE UNIT ONE NUCLEAR POWER STATION OLEDO EDISON COMPANY PAGE 2 SUPPLDENTAL INFORMATION FOR LER NP-33-78-30 Analysis of Occurrence:

There was no danger to the health and safety of the public or to unit personnel.

These instruments do not control any equipment but are used for monitoring purposes only.

- lh) other systems were affected by this occurrence.

No incident requiring use of this instrumentation occurred during the time the monitors were inoperable.

Corrective Action

It was decided in conjunction with Victoreen to replace the motor bearings with a sealed type bearing, FAFNIR Part No. 203PP and 205PP.

The motor bearings were replaced per Maintenance Work Order 78-579 in RE 5029. Post Accident Radiation Monitor RE 5030 is in a penetration room with lower ambient temperature; it has not been necessary to replace its motor bearings. Facility Change Request 78-159 was prepared for replacement of these bearings in all process monitors of this type.

The reporting require =ents of this Technical Specification will be emphasized with all affected station personnel.

y Failure Data:

Previous motor failures have occurred on Septe=ber 8,1977 and

( V by various equipment')1fovenber 8,1977, but only on RE 5029.

The re=aining occurrences were caused failures.

LER #78-026

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