ML20062E762

Final Rept of Significant Const Deficiency 45 Re Loose Mounting Screws Found in GE Akr 50 Relay Bell Alarm Switches.Corrective Action Per GE to Prevent Mounting Screws from Backing Out Completed

ML20062E762
Person / Time
Site:	Waterford
Issue date:	08/02/1982
From:	Mclendon G LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, 45, W3K-82-0472, W3K-82-472, NUDOCS 8208100319
Download: ML20062E762 (3)

Text

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142 DELARONDE STREET P O W E R & L I G H T! P O box 6008

• NEW ORLEANS. LOUISIANA

• (504) 366 70174 2345 S

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August 2, 1982 G. D. McLENDON Senic Vice Presdent W3K-82-0472 Q-3-A35.07.45 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 Final Report of Significant Construction Deficiency No. 45 "AKR 50 Relay Bell Switch Mounting Failure"

Reference:

Telecon - L. L. Bass (LP&L) to W. Crossman (NRC) on July 14, 1982

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 45, "AKR 50 Relay Bell Switch Mounting Failure."

If you have any questions, please advise.

Very truly yours, Y,) s c>mt.<)

G, D. Mc Lemlon CDMcL/LLB/grf Attachment cc: 1) Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission

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Washington, D. C. 20555  !

(with 15 copies of report) g 4g i

2) Director -

Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with I copy of report) \h%

N 8208100319 820802 PDR ADOCK 05000382 S PDR

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' LOUISIANA POWER & LIGHT COMPANY WATERFORD SES UNIT NO. 3 Final Report of Significant Construction Deficiency No. 45 AKR 50 Relay Bell Switch Mounting Failure Reviewed by /A > 7 47 &

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FINAL REPORT SIGNIFICANT CONSTRUCTION DEFICIENCY No. 45 "AKR 50 RELAY BELL SWITCH MOUNTING FAILURE *'

JNTRODUCTION This report is submitted pursuant to 10CFR50.55(e). Loose mounting screws have been fouc 8n bell alarm switches. The switches have separated from the mounting dsvice and certain switches havn been broken. This problem is considered reportable under the requirements of 10CFR50.55(e). To the best of our knowledge, it has not been identified to the Nuc1 car Regulatory Commission pursuant to 10CFR21.

DESCRIPTION On November 25, 1981, the mounting screws for a number of both safety-related and non-safety-related bell alarm switches attached to General Electric AKR 50 breakers were found to be loose or missing. In some cases, switches were broken as a result of loose screws. This device is used to give a remote (Control Room) indication of the breaker having tripped open through the action of one of its autonatic protection devices. The bell alarm switch is wired in series with the breaker closing circuit. If the contacts on this switch fail in the open position, this would prevent the breaker from closing upon receipt of a close signal. Safety-related circuits would possibly remain de-energized, thereby disabling safety equipment. This condition has been documented on Nonconformance Report W3-3318.

SAFETY IMPLICATIONS Failure of the subject switches would result in a loss of control of the affected breakers, which are installed in 480V redundant Class IE circuits. Thus, the safety-re*ated equipment served by these branch feeders will not be availabic when called for. This represents the violation of requirements in GDC 17 of 10CFR50 which are further stipulated in Regulatory Guides 1.32 and 1.53.

Therefore, the subject switches, if left uncorrected, would represent a safety hazard to the plant.

CORRECTIVE ACTION The vendor, General Electric, has provided corrective action to prevent the bell alarm switch mounting screws from backing out. It consists of applying RTV over the bolt head and surrounding surfaces after having first tightened the bolts.

Replacement switches for those that were broken have been installed. Corrective Action for the bell alarm switch mounting scrcus on the safety related IE circuit breakers has been completed as per NCR W3-3318 and supporting docu-mentation reviewed and accepted.

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