ML19261A561

LER 79-003/01X-0 on 790120:22A Radiological Control Program Lower Seal Temp Alarm & 2 Gal Per Minute Increase in RCS Leak Rate Resulted in Manually Tripping of Reactor.Cause of Event Will Be Discussed in Followup Rept

ML19261A561
Person / Time
Site:	Calvert Cliffs
Issue date:	01/22/1979
From:	Carroll J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-79-003-01X, LER-79-3-1X, NUDOCS 7901260203
Download: ML19261A561 (2)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 I Durina nomal coeration 22A RCP lower seal tercerature alam was received at I o 3 l0129. An approx. 2 gom increase in RCS leak rate was also evidenced by decreas- I o 4 lino VCT level. The reactor was manually tripoed at 0143 when increasina lower i o s I seal temperature exceeded 1950 F. An insoection of 22A RCP revealed a cracked I o s l weld on oumos lower seal oressure sensino line. Althouah the crack was isolable. I o 7 l due to increased bleedoff flow and fluctuatino seal oressure the decision was I o a Imade to replace seal assembly. Accordinaly, RCS cooldown was becun at 2015. (CONT) I 80 7 8 9 E CODE SUSC E COMPONENT CODE SL8 CODE S E 7

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PROMPT REPORT FOR:

LER 79-03 DOCKET N0. 50-318 EVENT DATE 01/20/79 REPORT DATE 01/22/79 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSE0VENCES: (CONTINUED)

LERs 77-15 (U-)) and 79-1 (U-2) describe similar events.

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