ML19208D438

LER 79-079/03L-0:on 790831,operator Noticed Drywell Oxygen/Hydrogen Monitor Had Low Flow Condition & Indicated Abnormally.Caused by Frozen Air Dryer.Dryer de-energized & Allowed to Thaw.Dryer Inspected W/No Problem

ML19208D438
Person / Time
Site:	Brunswick
Issue date:	09/25/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208D437	List: ML19208D436 ML19208D438
References
LER-79-079-03L, LER-79-79-3L, NUDOCS 7909280427
Download: ML19208D438 (2)

Text

NPC FORM 3G6 U. i NUCLE AR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l

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(PLEASE PRINT OR TYPE AL! REQUIRED INFORMATION) o i IN lC la le lp 12 l@lo o - o o o lo o l- lo lo l@l 411l 1 1l1l@l l l@

F 8 9 LICENSEE CODE 14 15 LICENSE NUMHE*4 25 26 LICENSE TYPE Ju b 7 C A T 58 CON T o 1

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1. 8 60 61 DOCK ET NUMBER 68 63 EVENT DATE 14 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lDuring normal plant operation, the operator noticed that the drwell oxygen / hydrogen j O 3 Imonitor, CPC-1263, had a low flow condition and was not indicating normally. Drywell l o 4 l oxygen concentration was maintained less than 47. by the CAC-1259 instrument. l

[ o l s j l Technical Specifications 3.6.6.4, 6.9.1.9b l 0 6 l 0 7 l O s ! I 7 8 9 80 SYST E M CAUSE CAUSE C O*.* P. VALyg CODE CODE SUBCODE COYPONENT CODE SU8 CODE SUBCODE ITTsl 1 8 IS lr l@ U@ l xl@ l IJA11l al D j al Yl@ g@ g @

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,,_ SEQUENTI AL OCCU R R E N CE REFORT REVISION LER EVENT YEAR REPORT NO. CODE TYPE NO.

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J2 TAKEN A T ON ON PLANT A T1 HOURS 22 S B ITT D FOH UB. SU PLIE MAN FACTURER x lgZ]g JJ 34 l35 Z lg lJuZ@ 3/

0l 0[ 0l 40 gg 41 42 Y lg l A g lH[0 4l1lg 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 i O [ An investigation found that the air dryer had frozen, blocking the sample air flow.

I1 Iil lThe dryer was deenergized and allowed to thaw, and a dry nitrogen purge was used to [

j, j7j l blow out the moisture and dry the coils. The dryer was inspected by a contract heat- l lij3; ing and air-conditioning company and no problem could be found with the dryer. The l g l system was returned to service and monitored for several days with no problems noted; l 7 8 9 (LON'l) 80

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STNS  % POWE R OTHER STATUS IS O RY DISCOVERY DESCRIPTION i s y@ l 0l 9l 3lgl NA l lAlgl Operator Surveillance l ACTIVITY CONTENT RELEASED CF RELE ASE AVOUNT OF ACTIVITY LOCATION OF R2 LEASE LL11] LzJ @ LzJ@l n i Im go i

1 8 9 10 11 44 45 PE RSONNE L EXPOSURES NUMBE R TYPE DESCRIPTION i 7 lo o l o l@L Z J@l NA

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PE RSONNE L iN;UdiES

' " 8 NUMBER DESCRIPTION i a l 1 8 9 l o l o l o 11l@l 12 NA po LOSS OF OR DAVAGE TO FACILITY Li Ltj l z l@l NA TvPE D E SC "'"' N 7909280LI De -

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7 8 9 10 80 ts DESCRIPTION vl e 12101 NSUE @l u i I i ii iIi15 1 8 9 10 68 09 80 %

NAME OF PREPARERA. C. To111 son, Jr. pnnyg WWMM 2

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LER CONTINUATION -- RO# 2-79-079 Facility: BSEP Unit No. 2 Event Date: 8-31-79 therefore, this is considereil an isolated event and no further action is required.

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