ML19273B933

LER 79-060/03L-0 on 790519:fire Barrier Removed to Allow Removal of Hydraulic Snubber,But Continuous Fire Watch Was Not Established.Caused by Faulty Procedure.Mod Made to Hydraulic Snubber Testing Procedure

ML19273B933
Person / Time
Site:	Davis Besse
Issue date:	06/13/1979
From:	Brown R TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19273B932	List: ML19273B931 ML19273B933
References
LER-79-060-03L, LER-79-60-3L, NUDOCS 7906180547
Download: ML19273B933 (3)

Text

U. S. NUCLE AR HEGULATORY COMMISSION NRC FORM 3GG (7 77)

- LICENSEE EVENT REPORT CONTROL DLOCK: l l l l l l l (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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5$E 60L l@l 61 0 l 5DOCKET l 0 NUMBER l - l 0 l 3 68l 4 63l 6 l@l 0l5l1l9 EVENT DATE 14 75 l 7 l 9 DATE REPOHT l@l 0 80l 6 l 1 3l7 EVENT DESCRIPTION AND PROBADLE CONSEQUENCES l o 12 i l On 3/19/79, a fire barrier was renoved to allow the removal of a hydraulic snubber, I l o l a I l but a continuous fire watch was not established because it was not initially considerej l

l o 141 l to be a fire barrier. At 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br />, it was determined to be a fire barrier and by j

o s [0900 hours, the barrier was scaled. There was no danger to the health and safety of lolsj lthe public or station personnel. There were no cable trays or combustibles in the 1 0 7 l immediate area, and there were no burning activities in the area during this violation l I

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l t I o l l The occurrence was due to a f aulty procedure. The job was started before [

11 I i j l 11 was determined if the barrier was a fire barrier. A modification has been m;Ldc to__]

I g , g , g l the hydraulic snubber testing procedure and a memo is being issued to all maintenance g,g3, l staf f to specify required actions prior to violating the integrity of a firewall or a l

g,;4g l negative pressure boundary. 80 7 8 9

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DVR 79-076 NAME OF PHEPAHER

• TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-63 DATE OF EVENT: May 19, 1979 EACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Violation of the integrity of a fire barrier ,

Conditions Prior to Occurrence: The unit was in Mode 5, with Power (MWT) = 0, and Load (Gross MWE) = 0. Description of Occurrence: On May 19, 1979, at approximately 0500 hours, a fire barrier above door 309 was removed to allow for removal of a hydraulic snubber SR 43 which had to be functionally tested per ST 5044.01, " Inspection Testing of Hydraulic Snubbers". Technical Specification 3.7.10 requires all fire barriers be intact at all times or a continuous fire watch be established within one hour after a fire barrier has been violated. Since the barrier was initially considered to be only a negative pressure boundary and the unit was in Mode 5, nn fire watch was established. Designation of Apparent Cause of Occurrence: The cause of the occurrence is due to faulty procedures. The job was completed ahead of schedule prior to determining if the barrier was a fire barrier or negative pressure boundary. The barrier was initially considered as a negative pressure boundary which is not required in Mode 5. Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. There are no cable trays or combustibles in the immediate area. There was no open flame, welding, cutting or burning activities going on in the area during the time the barrier was lef t open or unattended. Corrective Action: At 0830 hours on May 19, 1979 when it was realized that the barrier had been removed ahead of schedule, it was discovered that it was a fire barrier. Personnel were immediately sent to the area and the barrier was temporarily sealed by 0900 hours on May 19, 1979. After the snubber is reinstalled, the permanent fire barrier will be restored. A modification has been prepared to ST 5344.01, " Inspection and Testing of Hydraulic Snubbers" to specify actions to be taken if the fire barrier has to be removed again. A memo will also be issued to all maintenance staf f members on required actions needed prior to violating any firewalls or negative pressure boundaries. Maintenance personnel are reviewing the administrative controls for fire barriers and negative pressure boundaries to determine if further controls are required to prevent recurrence. LER #79-060 2'353 306

TOLEDO EDISON COMPANY DAVIS-BESSE FUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-63 PAGE 2 Failure Data: There have been two previously reported similar occurrences, see Licensec Event Reports NP-33-78-137 and NP-33-79-61. LER #79-060 2353 307}}