ML19324C208

LER 89-014-00:on 891011,plastic Sheeting Blocked Off Fire Detectors in Auxiliary Feedwater Pump 1-1 Room & High Voltage Switchgear Room B,Making Fire Detectors Inoperable. Caused by Personnel Oversight.Event reviewed.W/891110 Ltr

ML19324C208
Person / Time
Site:	Davis Besse
Issue date:	11/10/1989
From:	Storz L, Stotz J TOLEDO EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-89-014, LER-89-14, NP33-89-016, NP33-89-16, NUDOCS 8911150197
Download: ML19324C208 (4)

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EDISON PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652@01 i

November 10, 1989 Log No.s. BB89-01180 NP33-89-016 Docket No. 50-346 License No. NPF-3 United States Nuclear Regulatory Commission i Document Control Desk ,

Washington, D. C. 20555 I Gentlemen:

LER 89-014 Davis-Besse Nuclear Power Station, Unit No. 1 '

Date of Occurrence - September 25, 1989 Enclosed Licensee Event Report 89-014 which is being provided in accordance 'li with 10CFR50.73(a)(2)(1) to provide written notification of the subject occurrence.

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LFS/plf Enclosure 1

cc Mr. A. Bert Davis Regional Administrator USNRC Region III ,

l Mr. Paul Byron l

DB-1 NRC Sr. Resident Inspector l

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, On October 11,1989, at 1545 hours0.0179 days <br />0.429 hours <br />0.00255 weeks <br />5.878725e-4 months <br />, a Modification Supervisor reported to the Shift Supervisor that plastic sheeting was blocking off some fire detectors in Room 237 (Auxiliary Feedvater Pump 1-1 Room) and Room 323 (B High Voltage Switchgear Room). Further investigation determined that this plastic sheeting had been installed since September 25, 1989, to protect surrounding equipment durfng the removal of old and installation of new structural steel fire proofing material. However, the plastic sheeting had in effect made the detectors inoperable by separating them from the rest of the room atmosphere.

The plastic sheeting was subsequently removed by 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br />. Some of these room fire barriers had previously been declared inoperable, and with no detection on the opposite side of some of these barriers, a continuous fire vatt.h was required. Since these rooms were only being checked by an hourly fire watch patrol, the appropriate action statement was not being met.

The cause was personnel oversight. The supervisor of the insulating contractor personnel who installed the plastic sheeting failed to recognize L that he was sealing off the detectors which rer.dered them inoperable. The l Hodification Coordinators and Supervisors were counseled on this incident.

l The need to be sensitive to and question the ef fects of their ongoing vork on I plant equipment and systems was stressed.

This is reportable per 10CFR50.73(a)(2)(1)(B) as a condition prohibited by l

Technical Specification. Since these detection zones had been inoperable for more than 14 days, this is also being submitted as a Special Report per Technical Specification 3.3.3.8 action "b".

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, Description of Occurrence:

1 On October 11, 1989, at 1545 hours0.0179 days <br />0.429 hours <br />0.00255 weeks <br />5.878725e-4 months <br />, a Hodification Supervisor reported to the Shift Supervisor that fire detectors in Room 237 (Auxiliary Fe ! vater Pump 1-1 Room) and 323 (B High Voltage Switchgear Room) were being blocked by plastic sheeting used to vall off part of the room. The plastic sheeting barriers had ,

made the detectors inoperable by separating them from the rest of the room atmosphere. This resulted in fever than the minimum required number of fire detectors in these zones being operable. This requires compliance with the actica statement of Technical Specification 3.3.3.8, which requires that with a fire detection zone inoperable, 1) an hourly fire watch patrol be established and 2) that the detectors be restored to an operable status within 14 days. These rooms were already on an existing hourly fire watch patrol route due to previously identified fire barrier deficiencies. Therefore, action "a" of Technical Specification 3.3.3.8 was satisfied. For the. impaired fire barriers, an hourly fire watch requires that detectors be verifieds) operable on at least one side of the barrier. Having the detectors inoperable in conjunction with the fire barrier deficiencies requires compliance with '

action "a.1" of Technical Specification 3.7.10. With the fire detection zones in these rooms inoperable and no detection on the opposite side of some of the barriers, a continuous fire vatch is required. Since a continuous fire watch was not established, the Station was not in compliance with Technical Specification 3.7.10, fire barriers.

This is reportable as an LER per 100FR50.73(a)(2)(1)(B) as a condition prohibited by the Technical Specifications. In addition, since the plastic sheeting had-been in place for more than 14 days, this is also being submitted as a Special Report per Technical Specification 3.3.3.8, Action "b" and 6.9.2.

Cause of Occurrence:

The cause of this condition is personnel oversight. The supervisor of the insulating contractor personnel who installed the plastic sheeting failed to recognize that the fire detectors were being sealed off from the rest of the room.- This affected their operability and the conditions listed on the Technical Specification Operability Checkoff List, Attachment 13, of the Maintenance Vork Order packages. The requirement to have these room detection zones operable in order for the hourly fire watch to satisfy the action statements was listed on Attachment 13.

Analysis of occurrence:

Operability of the fire detection instrumentation ensures that adequate varning capability is available for the prompt detection of fires. This capability is required in order to detect and locate fires in their early stages. Plastic sheeting would not have prevented the eventual detection of a fire, but since these detectors are designed to respond to smoke, the plastic sheeting would have significantly delayed its response.

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, The hourly fire vatch patrol that was in place still provides detection of l fires as well as the detection of developing problems such as unusual odors and noise that may precede a fire. Therefore, there is little safety significance to this event. ,

Corrective Action to Prevent Recurrences  ;

The plastic sheeting was removed.by 1615 houre on October 11, 1989, allowing i the hourly fire vatch to satisfy the remaining applicable action statement. l l

This event has been revieved with the Modification Coordina* ors and Supervisors. The need to recognize and question situations for their potential impact on equipment and system operability was stressed.

Failure Data This is the first report of fire detectors being disabled due to personnel oversiEht when installing temporary barriers.

REPORT NO.: NP33-89-016 PCAO No.: 89-0506 l

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