ML20079L303

RO 83-08:on 830205,during Surveillance Testing,Control Element Assembly 26 Reed Switch Position Indicator Erratically Indicated Position & Declared Inoperable.Cause Unknown.Indicator Stacks Replaced

ML20079L303
Person / Time
Site:	Calvert Cliffs
Issue date:	02/08/1983
From:	Russell L BALTIMORE GAS & ELECTRIC CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-83-08, RO-83-8, NUDOCS 8302230227
Download: ML20079L303 (1)

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B ALTIMORE G AS AND ELECTRIC COMPANY P.O doX 1475 S A L T I M O s c. M A R Y L A N D 21203 1

eiucLE AR Poware osPARTMENT OakvsNT CLsFFS NGCLf 485 Postm Planet LVlSY. 844RYLA800 204 97 j

1 February 8. 1983 LI 4

' Mr. Ronald C. Eavnes, Director Docket No. $C-3L7 U. S. Nuclear Regulatory Commission License No. CPR 53 Region 1

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631 ParIr. Avenue lting of Prussia, PA 19406 ~~2

SUBJECT:

LEE 83-08 (U-1)

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Dear Mr. Haynes:

'a This report is to confirm our verbal notification to Mr. Ralph Architzal of your office of the loss of two CEA reed switch posi-tion indicator channels (T.S. 3.1.3.3) at Calvert Cliffs Unit One as required by Technical Specification 6.9.1.8 (Prompt notifica-tion v1 It written follow-up). The event and cause description ara

. as fo1L2ws.

At 0850 on February 5. 1983 durin's Surveillance Testing, with the Unit at 100% power CIA #26 reed switch position indication errat-ically indicated CEA position between 63" and 146" withdrawn and was declared inoperable. Reed switch position indication for l CEA #28 had previously been declared inopersole. At 0945 with two CEA read position indicator channels inoperable, action was taken to place the Reactor in Mode 3 as par Technical Specification 3.0.3.

The failed CEA read switch pas.ition indicator stacks have been replaced. All CEA pulse counting position indicator channels re-mained operable throughout the event.

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A nore complete description as to the cause of the CEA road switch position indicator channela and a description of correctivu action will be contained in che t'ollow-up ceport. -

j Very truly yours.

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L. B. Russell Plant Superintendent cc: J. A. Tiernan 3. M. UcL;1d66 Diroccor, Office of .%aage ant  ?.. E. Areniccel inforsation & Program Control [. . 3. 138'3811 X. A. Junge W. S. Gibson 8302230227 830208 PDR ADOCK 05000 p&

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