05000346/LER-1980-073-03, /03L-0:on 801008,inner Door of Containment Personnel Lock Could Not Be Latched.Caused by Two Broken Camrol Cam Follower Bearings in Door Operating Mechanism Control Linkage.Broken Bearings Replaced

/03L-0:on 801008,inner Door of Containment Personnel Lock Could Not Be Latched.Caused by Two Broken Camrol Cam Follower Bearings in Door Operating Mechanism Control Linkage.Broken Bearings Replaced

ML19340B583
Person / Time
Site:	Davis Besse
Issue date:	11/05/1980
From:	Syslo J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19340B577	List: 05000346/LER-1980-073, Forwards LER 80-073/03L-0 05000346/LER-1980-073-03, /03L-0:on 801008,inner Door of Containment Personnel Lock Could Not Be Latched.Caused by Two Broken Camrol Cam Follower Bearings in Door Operating Mechanism Control Linkage.Broken Bearings Replaced
References
LER-80-073-03L, LER-80-73-3L, NUDOCS 8011110322
Download: ML19340B583 (2)

LER-1980-073, /03L-0:on 801008,inner Door of Containment Personnel Lock Could Not Be Latched.Caused by Two Broken Camrol Cam Follower Bearings in Door Operating Mechanism Control Linkage.Broken Bearings Replaced

Event date:
Report date:
3461980073R03 - NRC Website

text

' NGC FORM 366 U. S. NUCLE AR REGULATORY COMMISSloN 47 7 LICENSEE EVENT REPORT 4

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 76 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

!p l2l ~l (NP-33-80-92) On 10/8/80 at 0520 hours0.00602 days <br />0.144 hours <br />8.597884e-4 weeks <br />1.9786e-4 months <br /> maintenance personnel discovered that the innerl

3; j door of the containment personnel lock could not be latched.

The door was declared l

l inoperable, and the station entered the action statement of Technical Specification l

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.g o i3; l3.6.1.3a.

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

.;; g l lsonnel. Unit personnel were able to use the emergency air lock while repairs were be-l

. j : 17 l l ing conducted on the personnel lock.

The other door of the personnel lock was l

Jlo!ai loperable.

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40 43 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1-l-l3]lThe cause was two broken CAMROL cam follower bearings in the control linkage of the l

l3 lil l door operating mechanism. The numerous operations of the personnel lock mechanism i,,7, lduring this outage, coupled with rough operation contributed to the failure. Under l

g, g 3 g l WO 80-3370 the broken cam follower bearings were replaced.- ST 5061.04 was success-l fully performed at 1610 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.12605e-4 months <br /> on 10/10/80 and the personnel lock was declared operablet

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4' TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-92 DATE OF EVENT: October 8, 1980 FACILITY: Davis-Besse Unit 1 The inner door of the containment personnel lock could IDENTIFICATION OF OCCURRENCE:

not be latched.

The unit was in Mode 3 with Power (MRT) = 0 and Conditions Prior to Occurrence:

Load (Gross MWE) = 0.

i On October 8, 1980 at 0520 hours0.00602 days <br />0.144 hours <br />8.597884e-4 weeks <br />1.9786e-4 months <br />, a problem was discovered Description of Occurrence:

during normal operation of the personnel lock for transport of maintenance personnel The inner door of thc containment personnel lock could not be latched.

and equipment.

The door was declared inoperable, and the station entered the action statement of Tech-The technical specification requires the air lock to be nical Specification 3.6.1.3a.

The action statement requires the airlock to be re-operable in Modes 1, 2, 3, and 4.

least hot standby within the stored to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at next six hours and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

The cause of this problem was two broken Designation of-Apparent Cause of Occurrence:

CAMROL cam follower bearings in the control linkage of the door operating mechanism.

The cam follower bearings are the link between the door roller chain drive shaft and The numerous operations of the personnel the door operating interlock mechanism.

lock door mechanism during the outage coupled with rough operation contributed to the Rough operation would result in severe shocking of the cam follower bearings Rough is being de-failure.

which could cause failures such as were found in this occurrence.

fined as operating *5e mech'anism too fast.

danger to t'he health and safety of the public There was no Analysis of Occurrence:

Unit perovunel were able to use the emergency air lock while or to station personnel.

The other door of -he personnel repairs were being conducted on the personnel lock.

lock was operable.

Under Maintenance Work Order 80-3370, the broken cam follower bear-

Corrective Action

ings were replaced and all the interlock mechanism cams were reset in their proper positions'. ST 5061.05 was successfully performed at 1610 ho'urs on October 10, 1980, and the personnel lock was declared operable.

k doors have been in Signs cautioning slow, careful operation of the personnel locmore than a yea place for A previous similar occurrence was reported in Licensee Event Report Failure Data:

NP-33-77-18.

LER# 80-073