ML19316B117

Final Deficiency Rept Re Electrical Connections on Back Pressure Steam Isolation Dampers Mfg by American Warming & Ventilating,Inc.Mfg Has Agreed to 100% Insp & Replacement Program,To Be Completed by 801231

ML19316B117
Person / Time
Site:	Limerick
Issue date:	06/06/1980
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML19316B114	List: ML19316B113 ML19316B117
References
SDR-10, NUDOCS 8006110332
Download: ML19316B117 (4)

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I FINAL REPORT ON 5

f BACK PRESSURE STEAM ISOLATION DAMPER ELECTRICAL CONNECTION f

,' DEFICIENCY AT

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I LIMERICK GENERATING STATION I

! UNITS I and 2 i

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Philadelphia Electric Company June, 1980

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E co o e110336 .

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s 5 0-o TABLE OF CONTENTS

2.0 DESCRIPTION

OF PROBLEM 3.0 ANALYSIS OF SAFETY IM?LICAIIONS 4.0 CORRECTIVE ACTION TAKEN

5.0 CONCLUSION

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r 1.0 INT RODUCTION The Limerick Generating Station Purchase Order 8031-M-113BC has procured back pressure steam isolation dampers from American Warming and Ventilating, Inc. for use in safety related systems.

Certain violations of the requirements of Project Specification 8031-ti-ll3 BC regarding workmanship on damper wiring and terminations have been identified. It has been determined that plant safety could have been compromised had these workmanship violations gone unidentified.

In compliance with 10CFR.0.55 (e), this Ptnal Report ls issued to describe the deficiencies, analyze the safety implication of the deficiencies, and describe the action taken to correct the deficiencies and prevent their recurrence.

This significant deficiency was reported via teiecon to the USNRC, Region 1 on May 7, 1980.

2.0 Description of Problem Improperly crimped electrical connecting lugs and nicked wLre insulation on American Warming and Ventilating, Inc. (AWV), Model 8700, Back Pressure Steam Isolation Dampers have been discovered by the Limerick Generating Station (LGS) Field Flectrical Group.

Inspection of a representative number of these dampers by Bechtel Construction personnel and AWV personnel has resulted in the conclusion that a generic problem exists with loose electrical connections and damaged wtre insulation. The loose connections are due to lmproper crimping of connectors on the ends of wires during production at the AWV plant. The nicked insulation is due to inadequate space for the No.12 gage wire used, resulting in interferences which have deformed the insulation.

182 of these dampers ate to be used in LGS. All but nine have been recetved at the job site, and sixty fLve have been installed.

3.0 Analysis of Safety Implications An open circuit caused by loose wires in tb 2 back pressure steam isolation damper pressure sensing and solenoid operating circuit would result in failure of the solenold to pull the pin which causes the counterweighted damper to close in tie event of a pipe break outside contalnment. Although the dampers are redundant, a generic wiring problem of fers no assurance that the redundant damper does not have the same problem.

Failure Of the dampers to operate could result in impairment of the proper operatton of safety related equipment in the event of an accident requiring safe shutdown.

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J 4.0 Corrective Action Taken The Limerick site HVAC sub-contractor has been directed to stop further installatton of back pressure steam isolation dampers furnished under Purchase Order 8031-M-113BC untti the identLf ted defletancies are corrected.

Representatives of AUV have visited the Limerick site and inspected a sampling of the dampers.

AWV has agreed to correct the noted deficiencies and has prepared a corrective action procedure that is currently being reviewed for approval by Bechtet. This procedure will provide for 100% inspection of the subject dampers, and 100% replacement of the damper wiring and crimped terminals. Smaller size wire (no. 14 gage) will be used to eliminate the mechanical interferences. A calibratable type tool will be used for crimping connectors.

It is antletpated that all correctLve actions will be complete by December 31, 1980.

AWV has advised Bechtel that on May 6,1980 they advised the USNRC of these defects under the reporting provisions of 10CFR, Part 21.

5.0 Conclusions It is concluded that the corrective actions described r.bove will correct and preclude recurrence of electrical deficiencies in AWV back pressure steam isolation dampers at Limerick Generating Station.

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