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 lllllh (PLEASE PRINT OR TYPE AL! REQUIRED INFORMATION)

6 o-o o o lo o l- lo lo l@l 411l 1 1l1l@lll@IN lC la le lp 12 l@lo o i F 8 9 LICENSEE CODE 14 15 LICENSE NUMHE*4 25 26 LICENSE TYPE Ju b 7 C A T 58 CON T 3[gC l L l@

015 0 l - l o l 3 l 2 l4 l@l 0 l8 13 l1 l7 l9 lg 0 l 9 l 2 l 5 l 7 9lg" " o 1#8 60 61 DOCK ET NUMBER 68 63 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lDuring normal plant operation, the operator noticed that the drwell oxygen / hydrogen j Imonitor, CPC-1263, had a low flow condition and was not indicating normally. Drywell l O 3l oxygen concentration was maintained less than 47. by the CAC-1259 instrument.

lo 4[ o l s j l Technical Specifications 3.6.6.4, 6.9.1.9b l0 6l0 7lO s !I 80 7 8 9 SYST E M CAUSE CAUSE C O*.* P.VALyg CODE CODE SUBCODE COYPONENT CODE SU8 CODE SUBCODE ITTsl IS lr l@ U@ l xl@ l A11l al D j al Yl@ g@ g @

1 8 9 10 11 12 IJ 18 19 2Q ,,_SEQUENTI AL OCCU R R E N CE REFORT REVISION LER EVENT YEAR REPORT NO.

CODE TYPE NO.O17 Rg'ROl7 9l_j 0l 7l 9ll ,,,, -l0l3lL [_l@_ 21 22 2J 24 26 21 28 2')30 31 J2 TAKEN A T ON ON PLANT A T1 HOURS 22 S B ITT D FOH UB.SU PLIE MAN FACTURER x lgZ]gl35 Z lglJuZ@0l 0[ 0lgg Y lgl A glH[0 4l1lg 34 3/40 41 42 43 44 47 JJ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27

[ An investigation found that the air dryer had frozen, blocking the sample air flow.

i O 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 lg l system was returned to service and monitored for several days with no problems noted; l 7 8 9 (LON'l)80 STNS^% POWE R OTHER STATUS IS O RY DISCOVERY DESCRIPTION y@ l 0l 9l 3lgl NA llAlgl Operator Surveillance li s ACTIVITY CONTENT RELEASED CF RELE ASE AVOUNT OF ACTIVITY LOCATION OF R2 LEASE LL11] LzJ @ LzJ@l n i Im i 1 8 9 10 11 44 45 go PE RSONNE L EXPOSURES NUMBE R TYPE DESCRIPTION lo o l o l@L Z J@l NA i 7'" 8 'PE RSONNE L iN;UdiES NUMBER DESCRIPTION l o l o l o l@l NA li a 1 8 9 11 12 po LOSS OF OR DAVAGE TO FACILITY 7909280LI De TvPE D E SC "'"' N

-Li Ltj l z l@l NA l_7 8 9 10 80 ts DESCRIPTION vle 12101 NSUE @l u i I i i i iIi15 1 8 9 10 68 09 80 %NAME OF PREPARERA. C. To111 son, Jr.

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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.s-M--J w