ML20003B797

LER 81-007/03L-0:on 810122,temp Switch TS 2-261-18D Failed to Trip.Caused by Fill Matl Leakage Due to Broken Capillary Tube Close to Sensing Bulb.Broken Switch Replaced W/New Calibr Switch

ML20003B797
Person / Time
Site:	Dresden
Issue date:	02/18/1981
From:	Speroff R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17193A743	List: ML17193A742 ML20003B797
References
LER-81-007-03L, LER-81-7-3L, NUDOCS 8102250569
Download: ML20003B797 (1)

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7 4 SQ SI DoCEET NUMsEm 68 69 EVENT QATE EVENT OGSCRIPTION AND PRO 8ABLE CONSECUENCES h la#2l l During Un'it 2 refueling outage, while conducting steam line area temoerature switch l l m-l l calibration surveillance, temperature switch TS 2-261-18D failed to trio. Tech.  !

10141l Spec. Table 3.2.1 requirement is a trip setting of less than or eoual to 200 F. Thisl

' t o i s t lis of minimum safety significance because remaining switches were operable and would i I o t e I thave cerformed their intended safety function. This is the first occurrence of its l loI7l Ikind. I total l I 50 7 8 9 SYSTEM e CAust CAuSE COMs. v4Lv E CCOE CODE suSCCOE CCM.*0NENT CCOE sV8 CODE sueCOCE lo19l l c II l@ (E_jh l B lh lI IN lS lT lR lU lh IS l@ lZ l@ 13 19 20 7 8 9 10 11 12 is

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liio,l Component failure was due to a broken capillary tube close to the sensing bulb, thus; ii {2 l l allowing the fill material to leak out. Corrective action was to replace the brokeng g g ; switch with a new calibrated switch. All steam line area temperature switches shall i i,63i l continue to be tested during each refueling outage. 1 i

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