ML17206A669

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Forwards LER 79-001/03L-0
ML17206A669
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 02/22/1979
From: Schmidt A
FLORIDA POWER & LIGHT CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17206A670 List:
References
NUDOCS 7903130325
Download: ML17206A669 (4)


Text

FLORIDA POWER II LIGHT COMPANY February 22, 1979 PRN-LI-79-44 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:

REPORTABLE OCCURRENCE 335-79-1 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: JANUARY 23, 1979 TECHNICAL SPECIFICATION 3.1.3.1 CEDM ¹43 The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9 to provide 30-day notification of the subject occurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS/cpc Attachment cc: Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control {3)

Harold F. Reis, Esquire File 933.1SL Dll 7

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REPORTABLE OCCURRENCE 335-79-1 LICENSEE EVENT REPORT PAGE TWO Additional Event Descri tion and Probable Conse uences When the reactor was tripped as part of the shutdown procedure, the two CEA's acted on by CEDM 843 stopped .during .their fall into the core at the 8 inch withdrawn position. Attempts. to:move these CEA's vere unsuccessful, and the CEA's were declared INOPERABLE. While investigating the cause, several attampts to move the CEA's,vere also unsuccessful. Following vendor recommendations, CEDM 843 motor h'ousing was removed and inspected.* The motor housing inspection results indicated that it was not the ca~use of. the occurrence.

While the CEDM motor housing was removed, a manual lifting.@evice was attached to the CEDM drive shaft. By applying an upward force (equal to aprox-imately 15% more than what the CEDM lifting device, normally applies) and using physical agitation to the lifting device the CEA's were freed and exercised. The CEDM motor housing was replaced and the CEA's and CEDM vere operationally tested satisfactorily. CEA drop

.time testing was performed as required by T.S. 4.1.3.4b. Also, drop time te'sting vas performed under cold conditions. .All drop times were well within limits with no significant differences when compared to previous test results. The CEA,'s were declared OPERABLE after about 79 hours9.143519e-4 days <br />0.0219 hours <br />1.306217e-4 weeks <br />3.00595e-5 months <br />.

There vere no adverse consequences due to this occurrence. Throughout the'period in which these CEA's were inoperable, adequate shutdown .margin was maintained. Virtually no additional reactivity in the core was pro- .

duced due to these CEA's being 8 inches withdrawn. Boron concentration in the RCS was maintained sufficiently high enough to provide adequate shutdown margin even if these CEA's and the next highest reactivity worth dual-CEA's were fully withdrawn simultaneously.

Also, CEA 861 dropped vhile inserting rods during this same reactor shutdown. Appropriate ACTION was taken. No cause for this drop could be determined.

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