ML19274D329

LER 78-040/03L-0 on 781221:during Main Steam Line Low Pressure Isolation Surveillance,Pressure Switch PS-2-261-30C Tripped Below Tech Spec Min.Caused by Instrument Drift.Pressure Switch Recalibrated

ML19274D329
Person / Time
Site:	Quad Cities
Issue date:	01/05/1979
From:	Hoeller J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19274D326	List: ML19274D325 ML19274D329
References
LER-78-040-03L, LER-78-40-3L, NUDOCS 7901230182
Download: ML19274D329 (1)

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74 76 REPORT DATE So 7 8 63 COCKET NUVBEH 68 09 EVENT DATE EVENT DESCRIPTION AND PRC3ASLE CONSEQUENCES h '

o 2 l While conducting the Main Steam Line Low Pressure Isolation Surveillance. nrncedorn I O 1 l QlS 20-1, pressure switch PS-2-261-30C tripped at 844 psi. This was 6 psi under I 0 4 the Technical Specification Limiting Condition for Operation of greater than or l l

o s equal to 850 psi. The remaining 3 pressure switches were found to be in proper l lO lc l I calibration. The primary containment isolation system would have performed its ntended function of clos'ing the Group i valves at > 850 psi in the RUll mode if l l0 l7l l _

required. l o a SYSTEM CAUSE CAUSE COYP. VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUBCODE l0l91 lS l0 l @ y @ lE l@ l l lH S lT lR lU l@ lSl@ d @

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l The cause of this occurrence was instrument drift. The pressure swi tch was recalibratell m T~l I to within Technical Specification limits and its functional capability satisfactorily I

, , g retested. These switches are checked for proper calibrat. ion on a routine monthly l basis. The instrument is a Barksdale model B2T-A1255 pressure switch. l

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