ML19259B493

LER 79-004/03L-0 on 790120:plant Stack Process Radiation Monitoring Sys Failed.Caused by Sample Line Freezing

ML19259B493
Person / Time
Site:	Pilgrim
Issue date:	02/12/1979
From:	Mathis C BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19259B492	List: ML19259B491 ML19259B493
References
LER-79-004-03L, LER-79-4-3L, NUDOCS 7902260410
Download: ML19259B493 (1)

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] I EVEN i 7 T!D0ATEl 7 l 9 lh 0 l 2 HEPORT 14 7's l 1 DA2T El 7 l 9 l@ '40 EVENT DFSCRIPTION AND PROHACLE CONSEQUENCES h lo l2l l On January 29, 1979 at 1220 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.6421e-4 months <br />. the Plant Stact: Precessm"utdiati nn unnitoritw I System failed as ir.dicated by "Ai/Lo Suc tion Flow to Stack Gas Sample Pomp" an-  ;

nunciation i.n the Control Room. Repairs were instituted immediately and when af ter j one hour repairs hel not been completed, a controlled shutdown was initiated as j r

l o I61 L_equired by T.S. and terminated when the sample system was returned to service.

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0 8 l l SYSTEM CAUSE CAUSE COVP. VALVE CCOE CODC SU8 CODE COYPONENT CODE SU8 CODE SUSCODE l0l9l lM lC l@ lC lh lZ lh l II Nl Sl Tl Rl Ulh l R lh W h 7 8 9 10 11 12 13 18 IJ 20

- SEQUENTI AL OCCURRENCE REPORT REVISION LER RO EVENT YEAR R EPORT NO. CODE TYPE NO.

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21 101al itI l-l 01 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHVENT NPR D.4 PRIVE COYP. CCYPONENT TAKEN ACitON ONFLANT YETHOD HOURS SUBMITTED FORMSUB. SUPP LI E R MANUFACTURER IB 33 l@lJ4 F @ lZ Jb l@ l36 Z l h J_/

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A0 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l Investigation revealed the sanole line was frozen. The sannle line was fraed with i i heat and system returned to normal. Heat tape has been annlied to rho m ~,1n linn to prevent future occurrences.

1 3 l l li l 41 1 I 7 8 9 80 STA S  % POW 8iR OTHER STATUS DISCO RY DISCOVERY DESCRIPTION I1 l 5 l [E__jh l 1 l 0 l O lhl N.A. l W hl Onor,rinn,1 Frone l ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 7

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44 l l 45 N.A. l 80 PERSONNEL EXPowHES NUMBER TYPE DE SCRIPTION LLL7J l i I l@lzl@l N.A. l PERSONNE L INJU 1ES 80 NUMBE R D E SCRIP it ON 7

i a 8 9 l0 0l0l@[ 11 17 y,g, gg LOSS OF CH DAMAGE ro FACILITY TYPE D E SC HIP 110N 7

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[N_ N.A. l llllllllI llllf 7 R 9 10 68 69 80 g NAME OF PHEPAHEH a es . his pgang;617-756-7900