ML20083N711

Final Deficiency Rept Re Conax Supplied Ring Tongue Connector Assemblies at Electrical Penetration Terminals. Initially Reported on 821110.Safety Terminal Block Retaining Nuts Retorqued

ML20083N711
Person / Time
Site:	Saint Lucie
Issue date:	01/28/1983
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, L-83-47, NUDOCS 8302030077
Download: ML20083N711 (3)

Text

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P. O. BOX 14000, JUNO BE ACH, FL 334J8 FLORIDA POWER & LIGHT COMPANY January 28,1983 L-83 47 Mr. James P. O'Reilly 'a Regional Administrator, Region 11 ._

U. S. Nuclear Regulatory Commission c 101 Marietto Street, Suite 3100 g Atlanto, Georgio 30303 -

Dear Mr. O'Reilly:

Re: St. Lucie Unit 2 _

Docket 50-38910 CFR 50.55(e),82-025 -

Rino Tonaue Connectors On November 10, 1982, Florida Power and Light Company (FPL) notified the Region 11 Office of Inspection and Enforcement in accordance with the requirements of 10 CFR 50.55(e) of a potential deficiency regarding the insulation of the Conax ring tongue connectors. Attached please find our final resolution of this issue. -

Very truly yours,

-% - M2 .%

6 Robert E. Uhrig Vice President Advanced Systems & Technology Attachment cc: Director of Enforcement and inspection U. S. Naclear Regulatory Commission Washington, D.C. 20555 OgygCIAL COQ.

8302030077 830128 M a7 /

PDR ADOCK 05000389

@ PDR PEOPLE. . SERVING PEOPLE

1. Summary A potential deficiency was identified in the Conox supplied ring tongue connector ossemblies at electrical penetration terminals, as documented in the Nonconformance Report No. 3379E, dated 3/5/82. The insulation installed on the ossemblies, which was intended to cover the ring tongue connector barrels, also partially extended onto the ring tongue connector surface at the penetrations. The vendor, Conox, has conducted a test in which the results indicate that the ring tongue connectors will function i properly if the terminal block nuts are torqued to o predetermined level. As a result, FPL decided to retorque all Class IE and certain non-lE vendor terminals on the penetrations. This effort has been completed.

FPL notified the NRC of this potential deficiency existing at the St. Lucie Unit 2 site os potentially reportable under 10 CFR 50.55(e) on November 10, 1982. This final report is submitted to advise the NRC of the description and corrective action that was taken.

II. Description Heat Shrink Insulation Tubing which was intended to cover the ring tongue lug barrel only, was found in three penetrations to extend over the ring tongue face. This could reduce the surface contact crea and impair the quality of the electrical connections.

The electrical penetration vendor, Conox Corporation, agreed to perform testing to determine contact integrity. The test results indicated that the -

above condition would not impair the safety related function of any equipment on St. Lucie 2. This test was performed and documented in Conox report IPS-910 dated June 18, 1982. This report was considered to be indicative of field conditions at St. Lucie 2, provided Conox could supply documentation that the ring tongue connector retaining nuts in the field were tightened to the some level as those in the Conax test. Conox could not provide such documentation. In order to make o positive correlation between the Conu t test report and field conditions, it was decided to retorque all Class IE and certain non-lE terminal block retaining nuts.

Ill. Corrective Action FPL odvised Construction to retorque all safety terminal block retaining nuts, as well as ceratain non-sofety block retaining nuts.

This retorquing will validate Conats test report for St. Lucie Unit 2, and thus 1

olleviate any safety concerns. The retorquing effort has been completed.

l IV. Safety implications 1

There have been no reported failures or malfunctions as a result of this potential deficiency. There was concern, however, that over longer periods of time, the condition described above could result in a degraded electrical connection that could offect operation of Class IE safety related equipment.

To alleviate this concern, corrective action as indicated above has been corried out. Due to the potential safety implications, we have determined that this item is reportable under 10 CFR 50.55(e).

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V. Conclusion E Corrective action as indicated in Section 111 of this report has been ,

undertaken. This closes out this item for St. Lucie Unit 2 with regards to the a NRC's reporting requirements.

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