ML17266A276

LER 80-049/03L-0:on 800904,during Full Power Operation, Control Element Assembly 21 Dropped to Full Insertion. Caused by Faulty 15-volt Power Supply.Power Supply Replaced & Redundant Supplies Are Being Installed

ML17266A276
Person / Time
Site:	Saint Lucie
Issue date:	09/30/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A220	List: ML17209A219 ML17266A276
References
LER-80-049-03L, LER-80-49-3L, NUDOCS 8010100322
Download: ML17266A276 (3)

Text

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1 3 64 = 4 OQCKsT NVAI34R EVENT OESCAIPTION ANO PROEASLE CONSEOUENCES QO Ourin full ower o eration CEA 21 dro ed to full insertion. 'Action was taken in accordance with T.S.3. 1.3. le. Reactor ower was reduced to 70Ã.

The ower su Ol uni't for CEA 21 had failed. The ower su 1 was re laced

~o 5 and CEA 21 was alioned with its rou hei ht. Similar occurrences were re orted as LER's 335-76-37, 78-21, 79-6, 80-2, 80-23; 80-45, 80-48.

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~lo The of A dro ed due to a fa i 1 ed 1 BV ower. su 1 SU-UN 1-30A-BU) . The CBA was restored to operable condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and normal operation was resumed. The power supply was a newer type which appears to have a high

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REPORTABLE OCCURRENCE 335-80-39 LICENSEE EVENT REPORT PAGE 2 SUPPLEMENTARY INFORMATION During the last'efueling, power supplies to the CEDM's were replaced with a new modified unit. To date these new power supplies have experienced a high failure rate. The old version of the power supplies have since been modified by the vendor. In an effort to reduce the number of power supply failures and resulting dropped rods the newer power supplies have been replaced with the older modified units. A program is also in progress to install redundant power supplies to minimize rod drops.

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