L-81-320, Interim Deficiency Rept Re Reliance Electric Supplied Microswitches,Initially Reported on 810625.Microswitches Inspected by Site Const Personnel to Assure Nonrotation During Actuation.Final Rept Will Be Submitted by 810824
| ML20009H393 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 07/24/1981 |
| 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-81-320, NUDOCS 8108100055 | |
| Download: ML20009H393 (3) | |
Text
7 P.O. 80 x 529100 MI AMI, F L 33152
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s-f j I,'g FLORIDA POWER & LIGHT COMPANY July 24,1981 L-81-320 Mr. James P. O'Reilly, Director, Region II Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
Re: St. Lucie Unit 2 Docket No. 50-389 RELIANCE ELECTRIC SUPPLIED MICR0 SWITCHES On June 25, 1981, Florida Power & Light Company notified the Region II Uffice of Inspection and Enforcement that Class IE microswitch housings, supplied by Reliance Electric, were capable of rotating as the switches are cycled. At that time the event was considered potenti'lly reportable. Upon further evaluation, we have determined that this situation is reportable and per the requirements of 10CFR50.55(e) have attached an interim report for your review. A final deficiency report will be issued by August 24, 1981.
Very truly yours, y
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CW Ro rt E. Uhrig s
s Vice President C
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Advanced Systems & Technology
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Attacoment cc: Director of Inspection and Enforcement s
U.S. Nuclear Regulatory Commission Washington, D. C.
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(with attachment)
Harold F. Reis (w/o attachment)
, ;co'7 S'fl 8108100055 110724 PDR-ADOCK 0500C389 S
PDR.
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I Summary Site construction personnel uncovered a problem with the installation of certain switches on the Reliance Electric RTG Boards located in the control room.
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 24, 1981. This interim report is being submitted to provide a description of the deficiency and the corrective actions to be taken.
II Description The RTG Board is provided by Relic. ce Electric on the St. Lucie Unit 2 1
project under purchase order NY-422551. Switches on the R% Board are supplied by Microswitch, U.S.A.
Microswitch U.S.A. provides a recommendation for the panel cutout for switches it supplies. A proper panel cutout must be fabricated for installation of the locking rings.
Certain switches did not have the proper cutout and internal locking rings were omitted during the mounting of those switcher on the panel of the RTG Board. Without the locking ring the switch housing could rotate when the switch is actuated.
III Corrective Action Site construction personnel are inspecting microswitches installed on the RTG Board for proper installaticn to assure that the. switches will not rotate during actuation.
For those microswitches that rotate, modification of the panel tab slot will be made in accordance w':th the reccmenaations of the vendor (Microswitch U.S.A.).
Locking rings for the microswitches are to be supplied and installed in accordance with the recommendations of the vendor.
IV jafety Implication 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 lE and are required for safe shutdown.
If the switch housings were capable of rotating, certain safety related equip-ment required for safe shutdown may not have been available. This was considered a deviation from equipment performance specifications and therefore considered reportable.
V Conclu; ion Although a deficiency exists in the mounting of Microswitches on the RTG Board, construction personnel are aware of the problem and the necessary corrective actions required to correct the situation will be-instituted as discussed in Section III above (Corrective actions).
L_
INTERIM DEFICIENCY REPORT
_ RELIANCE ELECTRIC SUPPLIED MICR0 SWITCHES s
Name of Station:
St. Lucie Plant - Unit 2 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 c
e 4
e
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