ML19350D382

Interim Deficiency Rept,Originally Reported on 801204,re Deficient Cable Terminations in Square D Supplied 480-volt Motor Control Ctrs.Acceptance Criteria Developed for Insp of Vendor Terminations

ML19350D382
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	03/30/1981
From:	Novarro J LONG ISLAND LIGHTING CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
10CFR-050.55E, 10CFR-50.55E, SNRC-553, NUDOCS 8104150380
Download: ML19350D382 (2)

Text

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4 LONG ISLAN;3 LIGHTING COM PANY

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.j SHOREHAM NUCLEAR POWER STATION P.O. 00X G18. N OR TH CO U NTR Y RO A D + WADING R. /ER. NN. n 792 SNRC-553 March 30, 1981 g s, .fi i. gc

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s Mr. Boyce H. Gr U.c J(C7 4o Y.1 Office of Inspection and Enforcement !j kl b Region I y,[g] 7 / am,gS U.S. Nuclear Regulatory Commission arg ^

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Long Island Lighting Company Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322

Dear Mr. Grier:

On December 4, 1980 in accordance with 10CFR50.55 (e), we reported verbally to Region I a deficiency with cable terminations in Square D supplied 480V Motor Control Centers. A 30 day written report of this deficiency was submitted on December 30, 1980 (Ref. SNRC-524). This letter serves as a follow-up report.

Description of the Deficiemy Cases of deficient vendo'r terminations were discovered when construction electricians were terminating field cables in Motor Control Centers (MCC's). Further investigations de-termined that deficient vendor termination were present in both safety and non-safety related MCC's. The problems found appear to be caused by a lack of adequate quality control in the method in which cable terminations were made. Termination lugs on vendor wiring have been found insufficiently crimped

such that conductors can fall out or easily be pulled out of I their lugs. Other cases have been found where terminal block screws en devices have not been tightened to secure the termi-nation lugs in place. In addition to these violations, others have been found where termination lugs have been bent further than permitted by criteria provided by the lug manufacturer and where the conductor has not been properly inserted into the lug before crimping. These deficiencies can cause inter-mittent or broken electrical circuits which might cause safety ,

related equipment to fail to operate when required.

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Mr. Boyce H. Grier March 30, 1981 Page Two .

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Corrective Action Acceptance critaria have been developed for inspection of vendor (Square D) tern.inations. All vendor terminations in every safety-related (Class IE) MCC will be inspected against this criteria; and if found to be deficient, they will be replaced.

There are presently 30 safety related (Class 1E) MCC's installed at Shoreham. These MCC's are sub-divided into MCC cubicles which supply motors and other loads. The deficient terminationshave been found in these vendor wired cubicles. Each cubicle of these MCC's which contains vendor cable terminations will be inspected for deficient terminations and corrected where necessary. The in-spection and replacement program vill be carried out by two " teams".

The first team will consist of contruction electricians working with inspectors from our Field Quality Control (FQC) organization.

They will perform the inspection and repair of all MCC cubicles not presently turned over to Start-up. The second team will consist of Start-up electricians with inspectors frem our Opera-tional Quality Assurance (OQA) organization. Titey will be re-sponsible to perform the repair work on all MCC cubicles presently turned over to Start-up. To date a total of 92 MCC's cubicles have been inspected and repaired between both teams, and they expect to complete the remaining cubicles by March, 1982.

Square D engineering and quality assurance have been apprised of this problen and will be kept informed as to the extent of deficiencies being found. To insure that no new Class IE MCC's

• or individual cubicles are purchased with this type of defect, Pro-curement Quality Assurance (PGA) will be directed to perform a 100% inspection of all vendor terminations. Where this proves to be infeasible FQC will be directed to perform this function after delivery of new equipment to the site.

Very truly yours,

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.fr- - .I-- I'i' J. P. Novarro Project Manager Shoreham Nuclear Power Station TJS/gmm cc: Mr. Victor Stello, Director Mr. J. Higgins NRC Office of Inspection and Enforcement NRC Trailer Division of Reactor Operations Inspection Site Washington, DC 20555