ML20076G693

Final Rept of Significant Const Deficiency 31 Re Incorrect Friction Factor in Pipe Support Hanger Designed by Bergen-Paterson.Nonconformance Rept W3-2732 Identified, Dispositioned & Tracked All Supports Requiring Rev & Rework

ML20076G693
Person / Time
Site:	Waterford
Issue date:	06/08/1983
From:	Drummond F LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, W3I83-0169, W3I83-169, W3I83-16955E, NUDOCS 8306160002
Download: ML20076G693 (3)

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LOUISIANA 242 ouAnome s1neer P O W E R & L I G H T! P O BOX 6000

• NEW 09tEAN3. LOUISIANA 70174

+ (504) 306-2345

$u?U?vsNIU June 8, 1983 W3I83-0169 Q-3-A35.07.31 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

Waterford SES Unit No. 3 -

Docket No. 50-382 )) @ {-(( { } \4,, , .)}

Significant. Construction Deficiency No. 31  ;

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" Incorrect Friction Factor Used In Design of Pipe Support Hangers"  ! ElI 01983 Final Report i k LU- - - - - -

REFERENCE:

LP&L letter W3I82-0075 dated October 15, 1982 __j

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copics of the Final Report of Significant Construction Deficiency No. 31, " Incorrect Friction Factor Used In Design of Pipe Support Hangers."

If you have any questions, please advise.

Very truly yours, l'

e" F. J. Drummond l Project Support Manager - Nuclear Attachment FJD/ MAL:keh cc: 1) Director 3) Mr. E. L. Blake Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with 15 copies)

2) Director 4) Mr. W. M. Stevenson Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 (with 15 copies) 8306160002 830608 PDR ADOCK 05000382 }PM S PDR Q

,,F FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 31

" INCORRECT FRICTION FACTOR USED IN DESIGN OF PIPE SUPPORT HANGERS" INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a deficiency in the selection of friction factors used for the design of pipe supports supplied by Bergen-Paterson. This problem is considered reportable under the requirements of 10CFR50.55(e).

To the best of our knowledge, this deficiency has not been identified to the _

Nuclear Regulatory Commission pursuant to 10CFR21. -

DESCRIPTION OF THE PROBLEM In the design of supports / restraints for the Waterford 3 Project Bergen-Paterson used a variety of friction factors. They eventually established a uniform friction factor policy which was dependent on the loading conditions for the

, particular support / restraint. It has been determined that supports / restraints to which the uniform friction factor policy was not applied might not withstand design loads when the policy was applied. Further review determined two-hundred ninety-one (291) supports were affected.

l The supports / restraints in the following systems were affected:

THE SAFETY RELATED THE NON-SAFETY RELATED l Feedwater Fire Protection Emergency Feed Water Heater Drains And Vents Fuel Pool Cool & Purification Make Up & Domestic Water System Main Steam RAB Normal Ventilation Waste Management Auxiliary Steam Reactor Coolant Air Evacuation Chem. & Volume Control Blowdown Safety Injection Condensate & Feedwater

( Boron Management Circulating Water Component Cooling Plumbing & Drainage Containment Spray Extraction Steam Emergency Diesel Generator Turbine & Turbine Controls Main Steam

' SAFETY IMPLICATIONS-(

If this deficiency were left uncorrected, dr. gradation of safety systems could

, possibly occur. Such degradation would occur by exceeding the design bending l

stresses of the subject pipe support structure. This deficiency also presents the potential for common mode failure within and between systems. Such failures are not analyzed in the FSAR.

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e SCD NO. 31 Pcge 2 cont'd CORRECTIVE ACTION TAKEN

1) Nonconformance Report W3-2732 was written to identify, disposition and track all supporte that required revision and rework for friction factor modification.

a. 103 supports had the correct friction factor and were accepted by Bergen-Paterson as is. _,

b. 185 supports required friction factor correction. New revisions of drawings were issued and implemented.

c. Hanger #CC-394 was voided. (It was not applicable to the friction problem). Hangers #SI-1027 & FP 190 were deleted.

2) Nonconformance Report W3-2732 was reviewed for disposition completion, accepted and closed on April 21, 1983.

This report is being submitted as the final report, l

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