05000346/LER-1983-020-03, /03X-1:on 830428,pressurizer Sample Isolation Valve Failed to Close.Caused by Personnel Error & Inadequate Maint Procedures.Torque Switch Reset,Valve Stem Cleaned & Lubricated & Maint Order 1-83-3114-00 Rewritten

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/03X-1:on 830428,pressurizer Sample Isolation Valve Failed to Close.Caused by Personnel Error & Inadequate Maint Procedures.Torque Switch Reset,Valve Stem Cleaned & Lubricated & Maint Order 1-83-3114-00 Rewritten
ML20140B702
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 01/17/1986
From: Long J
TOLEDO EDISON CO.
To:
Shared Package
ML20140B691 List:
References
LER-83-020-03X, LER-83-20-3X, NUDOCS 8601270096
Download: ML20140B702 (3)
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LER-1983-020, /03X-1:on 830428,pressurizer Sample Isolation Valve Failed to Close.Caused by Personnel Error & Inadequate Maint Procedures.Torque Switch Reset,Valve Stem Cleaned & Lubricated & Maint Order 1-83-3114-00 Rewritten
Event date:
Report date:
3461983020R03 - NRC Website
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NRC FORM 364:

U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONYROL BLOCK: l l

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES Oio lo lal l (NP-33-83-27) On April 28, 1983 at 1345 hours0.0156 days <br />0.374 hours <br />0.00222 weeks <br />5.117725e-4 months <br /> while attempting to shut RC240B from l g[ the Control Room, the valve would not shut unless the close button was repeatedly l

l pushed. RC240B was declared inoperable, placing the unit in the action statement l

o 4

' i o i s ; l of Technical Specification 3.6.3.1, which requires the inoperable valve to be l

0 s l restored within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or isolate the affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, or be l

[TlTl I in Hot Standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and in Cold Shutdown within the following l

l 0 la l l 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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33 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l The cause was inadequate maintenance procedures and lack of proper training.

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MWO 83-2864, the valve stem was found dirty and not lubricated, and the torque i

,, l switch was not set properly. The torque switch was set to the E-15 settings and g

3 3 l the valve stem cleaned'and lubricated. RC240B was returned to service at 1855 l

, 4 l hours on 4/28/83 removing the unit from the action statement.

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8 9 10 68 69 80 DVR 83-047 NAME OF PREPARER PHONE:

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-83-27 DATE OF EVENT: April 28, 1983 FACILITY:

Davis-Besse Unit 1 i

IDENTIFICATION OF OCCURRENCE:

Pressurizer Sample Isolation Valve (RC240B) failed to close Conditions Prior to Occurrence:

The unit was Mode 1, with Power (MWT) = 2716 and Load (Gross MWE) = 900.

Description of Occurrence:

On April 28, 1983, at 1345 hours0.0156 days <br />0.374 hours <br />0.00222 weeks <br />5.117725e-4 months <br /> while attempting to shut RC240B from the Control Room, the valve would not shut unless the close button was pushed repeatedly.

RC240B was declared inoperable, and the unit entered the action statement of Technical Specification 3.6.3.1 which requires the inoperable valve to be restored to operable status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, or isolate the affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, or be in at least Hot Standby t

within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and in Celd Shutdown within the following i

30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

7 Designation of Apparent Cause of Occurrence: The apparent cause i

of this occurrence was the valve operator torquing out due to a dirty and improperly lubricated valve stcm.

The root cause of this occur-y ance was a lack of proper training and inadequate Maintenance Pro-cedures (MP's) for conducting maintenance on Limitorque valve operators.

Analysis of Occurrence:

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

The redundant upstream isolation valve (RC240A) was operable had containment isolation been required.

Corrective Action

At 1425 hours0.0165 days <br />0.396 hours <br />0.00236 weeks <br />5.422125e-4 months <br />, RC240A was closed and tagged iso-lating the affected penetration.

Maintenance Work Order 83-2864 was issued to investigate the control scheme of RC240B.

It was observed that the valve stem was dirty and lacked lubrication. Additionally, the torque switch was found to be set at 3 open and 1 close. The required setting per E-15 was 2 open and 2 close.

The torque switch was reset to the E-15 value, and the valve sten was cleaned and lub-ricated.

RC240B was tested per Surveillance Test ST 5064.01 and returned to service.

RC240A was declared operable at 1855 hours0.0215 days <br />0.515 hours <br />0.00307 weeks <br />7.058275e-4 months <br /> on April 28, 1983, removing the unit from the action statement.

RC240B had been incorporated into the station Preventive Maintenance Program for routine inspection and lubrication, however, the preventive maintenance had not yet been performed.

When RC240B was inspected, it was noted that it had the older style torque switch.

Maintenance Work order 1-83-3114-00 has been written to replace the torque switch with

(

the new style.

No documentation was found that changed the torque

. oTOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL IhTORMATION FOR LER NP-33-83-27 PAGE 2 Corrective Action Cont':

switch settings from the E-15 value.

Presently, all maintenance work orders involving Limitorque torque switch settings require documentation of as-found and as-left settings.

When RC240B failed, it was our understanding that there were two different styles of torque switches for the SMB-000 size operators.

During subsequent conversations with Limitorque, they informed us that they only make one style of torque switch for the SMB-000 operators.

Therefore, the torque switch will not be changed out.

In addition, y

maintenance procedures MP1410.32 and 1411.04 thru 1411.07 have been written to test the valver using Motor Operated Valve Analysis and Test System (MOVATS) and provide detailed instructions for corrective and preventive maintenance.

We have also initiated a training program and certification process to ensure that only qualified personnel work on Limitorque operators.

Failure Data:

A previous failure of RC240B failing to close was reported in Licensee Event Report NP-33-80-18 (80-014).

LER #83-020 O

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