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On September 10, 2004 at 1730 hours, one s … On September 10, 2004 at 1730 hours, one steam supply isolation valve (TV-1MS-105B) to the steam-driven Auxiliary Feedwater System Pump (FW-P-2) unexpectedly opened at Beaver Valley Power Station Unit No. 1, causing this pump to commence feeding all three steam generators. FW-P-2 functioned as designed with steam being supplied to the pump's steam-drive turbine. Neither of the other two Auxiliary Feedwater System motor-driven pumps were actuated at Beaver Valley Power Station Unit No. 1. This initially caused Steam Generator Water Level Deviations alarms on all three steam generators. The steam generator levels returned to their normal operating levels via the automatic level control system. After determining that there was no demand for this Auxiliary Feedwater System pump to be operating, the control room crew attempted to close TV-1MS-105B from the control room, without success. The upstream motor-operated isolation valve (MOV-1MS-105) to TV-1MS-105B was then closed to stop steam flow to FW-P-2, terminating the auxiliary feedwater flow to the steam generators. </br>No maintenance or tests were ongoing with the Auxiliary Feedwater System at the time. Subsequent investigation determined that this event occurred due to a failure of an instrument card within the Solid State Protection System which caused TV-1MS-105B to inappropriately open. Therefore this actuation was not initiated by a valid actuation signal.</br>This event is reportable pursuant to 10 CFR 50.73(a)(2)(iv)(A) since it involved an actuation of a PWR auxiliary feedwater water system train as per 10 CFR 50.73(a)(2)(iv)(B)(6). This pump start was not part of a pre-planned sequence and did not occur with this system properly removed from service.</br>However, pursuant to 10 CFR 50.73(a)(1), this event is being reported via this telephone notification instead of submitting a written Licensee Event Report since the automatic actuation of the Auxiliary Feedwater System pump was not generated by a valid actuation.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.
21:30:00, 10 September 2004 +
14:40:00, 14 October 2004 +
21:30:00, 10 September 2004 +
On September 10, 2004 at 1730 hours, one s … On September 10, 2004 at 1730 hours, one steam supply isolation valve (TV-1MS-105B) to the steam-driven Auxiliary Feedwater System Pump (FW-P-2) unexpectedly opened at Beaver Valley Power Station Unit No. 1, causing this pump to commence feeding all three steam generators. FW-P-2 functioned as designed with steam being supplied to the pump's steam-drive turbine. Neither of the other two Auxiliary Feedwater System motor-driven pumps were actuated at Beaver Valley Power Station Unit No. 1. This initially caused Steam Generator Water Level Deviations alarms on all three steam generators. The steam generator levels returned to their normal operating levels via the automatic level control system. After determining that there was no demand for this Auxiliary Feedwater System pump to be operating, the control room crew attempted to close TV-1MS-105B from the control room, without success. The upstream motor-operated isolation valve (MOV-1MS-105) to TV-1MS-105B was then closed to stop steam flow to FW-P-2, terminating the auxiliary feedwater flow to the steam generators. </br>No maintenance or tests were ongoing with the Auxiliary Feedwater System at the time. Subsequent investigation determined that this event occurred due to a failure of an instrument card within the Solid State Protection System which caused TV-1MS-105B to inappropriately open. Therefore this actuation was not initiated by a valid actuation signal.</br>This event is reportable pursuant to 10 CFR 50.73(a)(2)(iv)(A) since it involved an actuation of a PWR auxiliary feedwater water system train as per 10 CFR 50.73(a)(2)(iv)(B)(6). This pump start was not part of a pre-planned sequence and did not occur with this system properly removed from service.</br>However, pursuant to 10 CFR 50.73(a)(1), this event is being reported via this telephone notification instead of submitting a written Licensee Event Report since the automatic actuation of the Auxiliary Feedwater System pump was not generated by a valid actuation.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector.
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100 +
00:00:00, 14 October 2004 +
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02:22:32, 2 March 2018 +
14:40:00, 14 October 2004 +
true +
false +
33.715 d (809.17 hours, 4.816 weeks, 1.108 months) +
21:30:00, 10 September 2004 +
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