ML19210D264

LER 79-090/03L-0:on 791027,shift in Output Occurred in Atmospheric Monitor 1-CAC-1263-3.Caused by Intermittent Failings of Magnetic Amplifier.Amplifier Replaced & Monitor Returned to Svc

ML19210D264
Person / Time
Site:	Brunswick
Issue date:	11/21/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210D261	List: ML19210D260 ML19210D264
References
LER-79-090-03L, LER-79-90-3L, NUDOCS 7911260210
Download: ML19210D264 (2)

Text

NRC FORM 366 ,

U. S NUCLEAR REGULATORY COMMISSION (7 77),. p ,

LICENSEE EVENT REPORT l (PLEASE PRINT OR TYPE ALL REOUIRED INFORMATIONI CONTROL BLOCK: l i

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0 1 8 3 lNlC l 3 l E l P l 141 l@l LICE %EE CODE 15 0 l 0 l - l 0 lL60CENSE l 0 l 0 -w l 0 l 0 26l@l264 l 1LICENSE l 0 NUMBER l 1 l,1 l 1 l@l l TYPE J0 57 CAT 58 CON'T 7

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60 61 OOCKET NUMBER 66 69 EVENT OATE 74 75 l l l REPORT DATE l l 80 lh EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l During normal operation, the operator noticed that the containment O 3 l atmospheric monitor 1-CAC-1263-2 had an unexplained shif t in its output. I O 4 I I O 5 l l 0 6 l l O 7 l l ,

O 8 I Technical Specifications 3.3.5.3. 6.9.1.9.b. I SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SUBCODE SU8 CODE g

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_ SEQUENTIAL OCCURRENCE REPORT REVISION LER RO E REPORT NO. CODE TYPE NO.

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_ 21 l 7VENT l9 YEAR 22 l-l 23 1019 l Ol 24 26 l/

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[--j 31 W32 KN A O ONP NT MET HOURS SB 4 FOR 8. SUP LIE MANUFACTURER lAl@lCl@

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41 40 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h 1 O [ An investigation determined that the mannetic amolifier was failine intermittent 1v. I Ii l11 I The amplifier was replaced and the monitor was returned to service. Since air I

, 2 l dryers were installed on these instruments two years ago, the problems with the I gl magnetic amplifiers have been significantly reduced. Due to the problems being l gl experienced with these containment monitors, Engineering is evaluating other i 7 s 9 80 SA 5  % POWER OTH ER STATUS 015 O RY DISCOVERY OESCRIPTION 1 5 (_E_jh l 0 l 9 l 1 l@l NA l l A lhl Operator Surveillance l A TIVITY CO TENT

• RELEASED CF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 6

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PERSONNEL EXPOAURES NUUSER ln %hI g1 l

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.ERSONsE L l~2u'llES NUYSER DESCRIPTION @ 1 p 0i 117 fit 1 8101 7 9 01 Ol@l 11 12 NA l 80 LOSS OF OR DAMAGE TO FACILITV O TYPE OESCRIPTION U d (_Jjhl 7 d 9 to NA 7911260 2 / ol 80 ISSUE DESCRIPT.ON

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68 69 80 E NAME OF PREPARER A. C. To111 son, Jr.

PHONE: 919-457-9521

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LER CONTINUATION - RO# 1-79-90 -

Facility: BSEP Unit No. 1 Event Date: 10-27-79 instrumentation to replace that now in use.

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