ML20091J435

Final Significant Const Deficiency Rept 90 Re Overlong, Overloaded or Otherwise Defective Safe Shutdown Conduits. Fischbach & Moore Ceased Performing Installations. NCR-W3-6727 Issued to Track & Document Corrective Actions

ML20091J435
Person / Time
Site:	Waterford
Issue date:	05/28/1984
From:	Gerrets T LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
90, W3K84-1260, NUDOCS 8406050509
Download: ML20091J435 (4)

Text

f .. U g LOUISIANA i42 ottAnoNoe srneer P O W E R & L I G H T! P O. BOX 6008

• NEW ORLEANS. .LOUISIANA (SG4) 366-2345 70174 UTIUTIES SYSTEM May 28, 1984 W3K84-1260 Q-3-A35.07.90 Mr. John T. Collins

$@S[][7"h Regional Administrator, Region IV 'g,0n ,

U. S. Nuclear Regulatory Commission 'l b 611 Ryan Plaza Drive, Suite 1000 "

Arlington, Texas 76012 1

REFERENCE:

LP&L letter W3K84-0843 dated April 12, 1984

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 90

" Electrical Conduct Overstressed" Final Report In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 90,

" Electrical Conduct Overstressed".

If you have any questions, please advise.

Very truly yours, T. F. Gerrets Corporate Quality Assurance Manager TFG:CNH:VBR Attachment cc: Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (15 copies) 8406050509 840528 PDR ADOCK 05000382 S PDR I.E -27 l k

+

Mr. John T. Collins May 28,1984 W3K84-1260 Page 2 cc: Director Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. E. L. Blake Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.

Washington, D.C. 20036 Mr. W. M. Stevenson Monroe & Lemann 1424 Whitney Building New Orleans, Louisiana 70130 Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 Mr. W. A. Cross 7910 Woodmont Avenue Suite 1200 Bethesda, Maryland 20814

9' -6.

FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 90

" ELECTRICAL CONDUIT OVERSTRESSED" INTRODUCTION This' report is submitted pursuant to ICCFR50.55(e). It describes a deficiency arising from the lack of complete installation records regarding verification of conduit and conduit support installation in accordance with established installation criteria for span and support loading.

To the best of our knowledge, this deficiency has not been reported to the USNRC pursuant to 10CFR21.

DESCRIPTION Electrical conduit installation at Waterford 3 was performed by Fischbach &

Moore (F&M). F&M field fabricated and installed conduit supports in accordance with approved designs and their opproved procedure, and inspected them under their quality program. However, records documenting perfogmance of load checks cannot be obtained.

As a result of Ebasco QA Field Surveillance on F&M conduit installations, a program was developed to further evaluate these installations. This program was implemented by Ebasco to evaluate existing Safe Shutdown conduits for compliance with design requirements and to effect the required corrective actions.

A listing was developed based on cable and conduit takeoffs from the Master Equipment List submitted to the NRC as part of the LP&L response to NUREG-0588. It encompasses cable / conduit required to mitigate and/or monitor a Loss of Coolant Accident, Main Steam Line Break or High Energy Line Break Accident.

Of 1838 conduits listed, it was determined that 206 were either wrapped in fire barrier material, had been reworked by Ebasco, or were in areas inaccessible to the walkdown personnel, leaving a sample of 1632 conduits which were walked down.

The 1632 Safe Shutdown Conduits walked down included 11,750 conduit spans on 5342 supports. Three percent of the spans were overlength and 3 percent of the supports were overloaded or defective.

Evaluations for acceptability were performed against the results of a detailed seismic analysis covering conduit spans by conduit size, orientation, span type, and strap types and also covering six common support types for various sizes, orientations, and types of anchorage; for all other types of supports the maximum loads given by the design dracings were used, or an analysis of the unique support was performed.

• 5 .

SCD #90

~

Page 2 DESCRIPTION (Continued)

Items affecting Safe Shutdown Conduits found to be rejectable were identified as to location and type of rework required to correct the condition and submitted to Ebasco Construction for performance of work.

SAFETY ANALYSIS Examples of typical worst case rejectable items (i.e., considerably overloaded or over-spanned compared to original criteria) were selected for analyses and/or test to determine whether failure resulting in circuit interruption or missile generation could occur. These analyses and tests indicated that no

'such failure would occur under design load conditions, if left uncorrected.

CORRECTIVE ACTION The installing contractor,-Fischbach & Moore, has ceased performing field installations; therefore, no corrective action on future installations under-their jurisdiction is required.

NCR-W3-6727 was issued to track and document corrective action for the Safe Shutdown Conduit installations identified as deficient.

The balance of the_ conduits installed by Fischbach & Moore i.e., those not required for safe shutdown of the plant, may be considered acceptable since the rejection rate of supports for Safe Shutdown Conduits was found to be low, and since no rejectable item was identified which had it not been fixed, would have led to loss'of function of safety-related system or missile generation which could threaten a safety-related system.

It is concluded that the balance of the conduits are supported in a manner

. adequate to satisfy the requirements for Quality, and earthquake resistance of.

safety-related structures. No further corrective action is required.for the remaining conduit.

-All corrective actions have been completed and supporting documentation has been reviewed.

This report is sabmitted as the Final Report.