05000324/LER-1981-023, Forwards LER 81-023/03L-0

Forwards LER 81-023/03L-0

ML20003D762
Person / Time
Site:	Brunswick
Issue date:	03/25/1981
From:	Dietz C CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003D763	List: 05000324/LER-1981-023, Forwards LER 81-023/03L-0 05000324/LER-1981-023-03, /03L-0:on 810224,primary Containment Atmospheric Monitor Oxygen Analyzer 2-CAC-ATH-1259-2 Indicated Torus Oxygen Concentration of 15%.Caused by Analyzer Failing to Calibr,Due to Failure of Analyzer Electromagnetic Unit
References
NUDOCS 8103310544
Download: ML20003D762 (2)

LER-1981-023, Forwards LER 81-023/03L-0

Event date:
Report date:
3241981023R00 - NRC Website

text

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Carolma Power & Light Company n

Brunswick Steam Electric Plant P. O. Box 10429 Southport, NC 28461 March 25, 1981 FILE: B09-13516 SERIAL: BSEP/81-9647 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II, Suite 3100 101 Marietta Street N.W.

Atlanta, GA 30303 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET No. 50-324 LICENSE NO. DPR-62 LICENSEE EVENT REPORT 2-81-23

Dear Mr. O'Reilly:

In accordance with Section 6.9.1.9b of the Technical Specifications for Bruns-wick Steam Electric Plant, Unit No. 2, the enclosed Licensee Event Report is submitted. This report fulfills the requirement for a written report within thirty (30) days of a reportable occurrence and is in accordance with the format set forth in NLTdG-0161, July 1977.

Very truly yours, I

C. R. Dietz, General Manager Brunswick Steam Electric Plant RMP/ mew-

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LER ATTACICiENT - RO #2-81-23 Facility: BSEP (' nit No. 2 Event Date: 2-24-81 This event occurred due to a failure in the 1259 monitor oxygen analyzer elec-tromagnetic unit which prevented an accurate response to changes in sample ficw oxygen concentration. A visual examination of the analyzer electromagnetic unit suspension assembly showed that the cest body balls had beccee dislodged frca the electromagnetic unit photomultiplier tube assembly causing the erroneous oxygen concentration indication due to changes in light reflection in the suspension assembly. A definite cause for the dislodged test body balls could not be found. Two possible causes for dislodging test body balls are:

1) The slight negative pressure surge experienced in the electromagnetic unit when the monitor sample points are changed.

2) The electremagnetic unit is =cchanically shocked when installed in the moni-tor.

In both cases it is possible for the unit to experience a partial weakening of the test body ball suspension apparatus that could lead to an eventual failure of the analyzer electromagnetic unit.

The monitors containing this type unit are calibrated on a bi-weekly basis.

This calibration and normal instrument surveillance will detect any f ailures as they occur. Due to a history of past events, a plant modification has been developed which will implement the replacement of these type conitors with others of a more reliable design during the next scheduled unit outage, following the receipt of the replacement monitors.

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