ML19290F018

LER 80-011/03L-0:on 800208,W/RCS at 130 Degrees & 250 Psia, Shutdown Cooling Suction Header Relief Valve Lifted & Failed to Reset.Caused by Valve Being Left at Improper Relief Pressure Due to Error Following Testing

ML19290F018
Person / Time
Site:	Calvert Cliffs
Issue date:	03/07/1980
From:	Davis S, Huseby D BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19290F015	List: ML19290F014 ML19290F018
References
LER-80-011-03L, LER-80-11-3L, NUDOCS 8003170459
Download: ML19290F018 (2)

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• o 2 l At 2040 with the reactor coolant system at 130 degrens and 750 neia o a i shutdown cooling (S'6C) suction header relief (SI-468-RV setooint 315 nsio) I Shutdown cooling was stopped g o 4 llif ted and failed to reset (T.S. 6.9.1.9.d).

o s land isolated from the RCS at 2042. #11B and #12B retctor coolant pumps i o a 1(RCP) and both steam generators remained operational during the event. I o 7 1 #118 RCP was run ror 30 seconds at 2139 per T.S. 3.4.1. The valve was shut I o a 1and SDC rpstarted at 7716 This it nnt a renetitive occurronce. ,

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3 lC 44 7111Ol@ 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l -SI-468-RV l was left set at the improper relief pressure folic .ng a ii li i i surveillance test due to a procedural error. This resulted in the i i,121 I valve lifting and not reseating during the pump venting. t i

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LER NO. 80-11 DOCKET NO. 50-317 EVENT DATE 02/08/80 REPORT DATE 03/07/80 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSE0VENCES:

At 2040 with shutdown cooling in operation while conducting reactor coolant pump venting operations (#11B and #128 reactor conlant pumps were vented and operational) shutdown cooling suction header relief valve (SI-468-RV, setpoint 315 + 8 psig) lifted and failed to fully reseat (T.S. 6.9.1.9.d) . The reactor coolant system was at 1300F and 250 psia with a bubble in the pressurizer. When the relief valve opened pressurizer level decreased from 140 to 90 inches (approximately '

1200 gallons of reactor coolant). The reactor coolant was discharged to the five foot elevation of the Auxiliary Building. The Auxiliary <

Building was immediately vacated as a precautionary measure. Air- .

borne activity did not increase. The shutdown cooling system was stopped and isolated from the reactor coolant system at 2042. While the shutdown cooling system was isolated #11B reactor coolant pump was run for 30 seconds at 2138 to satisfy J.S. 3.4.1. The relief valve was shut by installing a gagging device. The shutdown cooling system was returned to service at 2215. Access was restored to all areas of the Auxiliary Building at 0015 on 2/9/80. This is not a repetitive occurrence.

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

The setpoint of this relief valve was changed from 285 psig to 315 psig on 1/24/78. Subsequently, thic valve was tested on 3/20/79 using a procedure which had not been changed to reflect the new setpoint. The .

valve was left set at 285 psig following tnis testing. The pump venting on 2/8/80 caused pressure spike which caused the relief valve to open.

The valve was not able to reseat since system pressure did not decrease below its blowdown setting. This valve was gagged and later was removed, reset to 315 psig, and returned to service. The test procedure referred to above was revised on 10/10/79 to reflect the 315 psig set-point for RV-468. The setpoint control procedure will be revised to ensure that a copy of all setpoint changes are routed to the surveillance test coordinators so the test procedures can be updated in a timely manner.

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