05000346/LER-1980-048-01, /01T-0:on 800627,during IE Bulletin 79-14 Insp, Pipe Support HCB-40-B1 Found Not Installed & CCA-8-H15 Found Mislocated.Caused by Initial Const/Installation Error. Supports Will Be Installed in Proper Locations

/01T-0:on 800627,during IE Bulletin 79-14 Insp, Pipe Support HCB-40-B1 Found Not Installed & CCA-8-H15 Found Mislocated.Caused by Initial Const/Installation Error. Supports Will Be Installed in Proper Locations

ML19320B966
Person / Time
Site:	Davis Besse
Issue date:	07/10/1980
From:	Mekbel C TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19320B963	List: 05000346/LER-1980-048-01, /01T-0:on 800627,during IE Bulletin 79-14 Insp, Pipe Support HCB-40-B1 Found Not Installed & CCA-8-H15 Found Mislocated.Caused by Initial Const/Installation Error. Supports Will Be Installed in Proper Locations
References
IEB-79-14, LER-80-048-01T, LER-80-48-1T, NUDOCS 8007150566
Download: ML19320B966 (2)

LER-1980-048, /01T-0:on 800627,during IE Bulletin 79-14 Insp, Pipe Support HCB-40-B1 Found Not Installed & CCA-8-H15 Found Mislocated.Caused by Initial Const/Installation Error. Supports Will Be Installed in Proper Locations

Event date:
Report date:
3461980048R01 - NRC Website

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NRC F E RJ 3GG -

U. S. NUCLEAR REGULATORY COMMISSION (7 71)

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8 60 61 DOCK ET NUVB ER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lol2l l (NP-32-80-09) While evaluating the inaccessible pipdng systems as required by IE Bullet-lo la l l tin 79-14, pipe support HCB-40-B1 was found not installed and CCA-8-H15 was found mis-j l o 14 l l located.

It was determined that the found condition was less conservative than l

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,,,7i l HCB-40-B1 will be added and CCA-8-H15 will be redesigned and relocated to its original l g l position under'FCR 80-131 Supplement 3.

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e TOLEDO EDISON COMFANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-32-80-09 DATE OF EVENT: June 27, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Pipe supports HCB-40-B1 and CCA-8-H15 not installed Es designed i

I Conditions Prior to Occurrence: The unit was in Mode 6, with Power (MWT) = 0 and k'

1Lsad (Gross MWE) = 0.

Discription of Occurrence: While performin3 the walkdown and engineering evaluation for inaccessible piping systems required by IE Bulletin 79-14, the following was found:

Pipe support HCB-40-B1 on the component cooling water (CCW) supply to the control rod drive (CRD) mechanism coolers was not installed. This would have left approxi-mately 21 feet of 3 inch pipe between the containment penetration and the isolation valve laterally unrestrained during an earthquake.

Lateral restraint CCA-8-H15 on the pressurizer relief inlet was located about 9 inches

'from its analyzed location..This descrepancy would have caused an overstressed con-dition in a welded attachment to this line during an earthquake.

I During the detailed engineering evaluation of these descrepancies, it was determined

.that the'found condition was less conservative than assumed in the accident analysis j

of the safety analysis report and is being reported under Technical Specification i

6.9.1.8.1.

l-n Designation of Apparent Cause of Occurrence: The cause of the occurrence was an ini-tial construction / installation error. HCB-40-B1 was never installed and CCA-8-H15 l

1 w2s mislocated.

' Analysis of Occurrence: There was no danger to th'c health and safety of the public or to station personnel. These restraints do not affect normal unit operation.. Pipe support HCB-40-H1 is only required to resist loads resulting from-a design basis c:rthquake. Lateral. restraint CCA-8-H15, in its as-found condition, would not have bten overstressed except during a' design b. sis earthquake, since 98% of the restraints drsign load is scismic.-

Cirrective Action: _ Pipe support HCB-40-B1 will be added under FCR 80-091 Supplement 6.

Lateral restraint CCA-8-H15.will.be redesigned and relocated to its original Position under FCR 80-131 Supplement 3.

These descrepancies will be'ecrrected prior to startup from the current refueling outage.

Failure' Data: There have been no previous reported findings where the installation was not per design.

' LER' #80-048 '

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