ML19263E234

LER 79-028/03L-0 on 790508:N2 Line Low Temp Alarm Received & Frost Found on Inerting line.A0-2-1601 & Inerting Line Failed Leak Rate Test.Caused by Failure of Temp Recorder at N2 Vaporizer

ML19263E234
Person / Time
Site:	Dresden
Issue date:	05/25/1979
From:	Parcell COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A897	List: ML17173A896 ML19263E234
References
LER-79-028-03L, LER-79-28-3L, NUDOCS 7906050353
Download: ML19263E234 (1)

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8 -- 60 61 COCKET NUVSER 68 63 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 012 l h'hile inerting primary containment, '12 line low temp alarm was received and frost found) 3 3 [on inerting line. The Operator immediately stopped inerting. Local leak rate test was[

lperforned on inerting line and A0-2-1601-22 had unmeasurable leakage. Since inboard l g 4 3igi  ; isolation valves incurred no damage, primary containment integrity was maintgined.  ;

g is ;Similar events: 50-237/75-48, 50-237/1974-32, 33, 34 & 50-249/1975-6.

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SEQUENTt AL OCCUAAENCE REPCRT REVIS!ON LEA Ro EVENT YEAR REPORT NO. CCCE TYPE N O.

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41 lNlg lNl@ P l 3 l 4 l 0 lg 32 M 36 37 40 42 43 44 47 CAusE DESCRIPTION AND CCRRECTIVE ACTICNS h a l The temperature recorder at N2 vaporizer failed and continuous 1v read 21?- den. F. J lhn :nerting was stopped, enough N2 had entered the inertina line to danace the 1601- 1 i, [22 valve seat. The valve was blind flanced and crimarv boundarv was succeufully -  !

3 ) local leak rate tested. Temperature recorder aas renaired and 1601-22 will be ,

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• replaced. L:o further corrective action planned. I a 3 80 STA S %PCnER OTHER STATUS SCO PY DISCOVERY CESCRIPT'ON iI5 W@ l 0 l 2 l 2 l@l NA l l A f@l N2 Line Lcw Temp Alarm l ACTIVITY TE"AT RELEASED OF PELEASE AMOUNT CF ACTIVITY LCCATION OF RELE ASE sn i glzlgi u i NA i 7

8 9 to 11 44 45 8J PERSONNEL E.vPCSL AES NUMRER TYPE C E SCaip TIC N 4 i 7 4 9 1010l01@lzl@l il 12 13 NA 80 l

PE R SCNNE L IN;LRIE S NUY8ER DESCR,PTIC*. 4 I L. / s U i

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N AP.*E O F P R E P A R E R PHONE 5~2