L-81-368, Final Deficiency Rept Re Reliance Electric Supplied Class IE Microswitch Housings,Initially Reported 810624.Panel Tab Slot Modified,Locking Rings Provided & Switches Installed Following Nonconformance Rept Procedure
| ML20010E717 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 08/24/1981 |
| 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-81-368, NUDOCS 8109080193 | |
| Download: ML20010E717 (3) | |
Text
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P O. BOX 529100 MI AMI, F L 33152 e
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,,, c August 24, 1981 L-81-368 Mr. James P. O'Reilly, Director, Region II Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission b3
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Dear fir. O'Reilly:
Re:
St. Lucie Unit 2 Docket No. 50-389 Reliance Electric Supplied Microswitches On June 24, 1981, Florida Power & Light Company notified the Region II Office of Inspection ar.d Enforcement of a potential reportable deficiency where Class IE microswit.h housings, supplied by Reliance Electric, were capable of rotating as the switches are cycled. An interim report was submitted to you on July 24, 1981 (L-81-320). FPL has completed its evaluation and a final deficiency report is attached for youa review.
Very truly yours,
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Robert E. Uhrig J
Vice President 9-Sgp 0<1198I "
Advanced Systems & Technology
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Director of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
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Harold F. Reis, Esquire (w/o attachment) p 1
Iff 8109080193 810824 PDR ADOCK 05000389 S
PDR PEOPLE,. SERVING PEOPLE
1 FINAL DEFICIENCY REPORT RELIANCE ELECTRIC SUPPLIED MICR0 SWITCHES Names of Station:
St. Lucie Plant - Unit 2 1
Owner:
Florida Power & Light Company Architect / Engineer:
Ebasco Services, Incorporated Date of NRC Notification:
June 24,1981 Interim Report Filed:
July 24, 1981 Final Report Due:
August 24, 1981 l
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.I.
Summary During an unplanned QC inspection of the control room RTG board, site construction personnel uncovered a problem with the installation of switches on the boards.
It was realized that proper panel cutouts were not made and the switch housing could rotate during switch actuation. Potential existad for degradation of the contacts and wires to a point when it could break.
Per the requirements of 10CFR50.55(e), the deficiency was considered potentially reportable and, FP&L (W. Haywood) notified the NRC (H. Dance) on June 25, 1981.
This final report is being submitted to provide the :'RC a description of the deficiency and the corrective actions taken.
II. Description The RTG Board is provided by Reliance Electric on the St. Lucie Unit 2 Project under purchase order NY-422551. Switches on the RTG Board are specified to be supplied by Microswitch, U.S. A.
Microswitch U.S.A. provided a recommendation for panel cutout for switches it supplies. Locking rings are required to be provided to prevent the switch housing from rotating as the switch knob is rotated. A proper panel cutout must be fabricated for installation of the locking rings.
Certain key operated selector switches were identified as not having the proper cutout.
Internal locking rings were omitted during the mounting of these switches on the panel of the RTG Board. Without the locking ring the switch housing could rotate when the switch is actuated.
III.
Corrective Action The vendor was contacted and based on their recommendation, site construction developed a Nonconformance Report (NCR #1928E) which specifies a procedure by which all key operated selector switches installed on the RTG boards were inspected for proper installation.
For those microswitches that rotate, proper modification of the panel tab slot was made.
Locking rings were provided and the switches were installed following the NCR.
IV.
Sf ety Implication f
The improper installation of the microswitches on the RTG Board could have adversely affected the safety of operations of the plant during its lifetime if it were to have remained uncorrected, since some of these switches are Class IE and are required for safe shutdown.
If the switch housings were capable of rotating certain safety related equipment required for safe shutdown may not have been available. This was considered a deviation from equipment performance specifications and therefore considered reportable.
V.
Conclusion Corrective action as indicated in paragraph III was completed. This closes out this item for St. Lucie Unit 2 as regards to 10CFR50.55(e) requirements.
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