Browse wiki
Jump to navigation
Jump to search
On 4/20/09 at 0153 hours, while in Mode 3 … On 4/20/09 at 0153 hours, while in Mode 3 performing a plant cooldown for a refueling outage, a control room operator noted that the 'B' train steam supply (TV-1MS-105B) to the steam driven auxiliary feedwater pump, FW-P-2, was open. This caused the steam driven auxiliary feedwater pump to start and inject auxiliary feedwater into the steam generators. This was an unexpected condition. The start of the FW-P-2 auxiliary turbine driven feedwater pump is reportable under 10CFR50.72(b)(3)(iv)(A).</br>At 0209, TV-1MS-105B was closed. The steam driven auxiliary feedwater pump was declared inoperable and Technical Specification action statements were entered. Technical Specification 3.7.5 Condition B requires the pump to be restored to operable status within 72 hours or be in Mode 4 within the following 18 hours.</br>Mode 4 was entered on 4/20/09 at 0347 hours. The steam drive auxiliary feedwater pump is not required to be operable in Mode 4. Technical Specification 3.7.5 Condition B was exited on 4/20/09 at 0347.</br>Investigation is in progress to determine the cause of TV-1MS-105B opening.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE ON 5/13/09 AT 1021 EDT TO RETRACT ORIGINAL EVENT AND REPORT AS INVALID ACTUATION FROM MATTY TO HUFFMAN * * *</br>This notification retracts 10 CFR 50.72 Event Notification No. 45001 since the actuation that was reported has subsequently been determined to be invalid.</br>On April 20, 2009, Beaver Valley Power Station Unit 1 (BVPS-1) was in Mode 3 and being shutdown in preparation for a refueling outage. At 0153 hours, one steam supply isolation valve (TV-1 MS-105B) to the steam-driven Auxiliary Feedwater System Pump (FW-P-2) unexpectedly opened at BVPS-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-driven turbine. This actuation was reported in NRC Event Notification No. 45001.</br>This start of the steam-driven Auxiliary Feedwater Pump was not valid. There was no adverse Steam Generator water levels, no Safety Injection signal, and no Reactor Coolant Pump undervoltage condition which could have caused an Auxiliary Feedwater Pump start. No maintenance or tests were ongoing with the Auxiliary Feedwater System at the time. After observing that there was no demand for this Auxiliary Feedwater System pump to be operating, the control room crew closed the steam supply isolation valve from the control room at 0209 hours, terminating operation of this auxiliary feedwater pump.</br>A follow-up problem solving team investigation did not identify any deficiencies within the solid state protection system. The most likely cause involved a degraded control room benchboard switch for TV-1 MS-105B. The physical degradation of the control switch would have allowed for the unplanned opening of the steam supply to the Auxiliary Feedwater Pump. This benchboard switch has been replaced and satisfactorily tested.</br>This event is being retracted since the Auxiliary Feedwater Pump actuation was not valid and therefore not reportable pursuant to 10 CFR 50.72(b)(3)(iv)(A) as previously reported.</br>This event is, however, reportable pursuant to 10 CFR 50.73(a)(2)(iv)(A) since it involved an actuation of a PWR Auxiliary Feedwater system train as listed per 10 CFR 50.73(a)(2)(iv)(B)(6). 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 has notified the NRC Resident Inspector. R1DO (Holody) notified.sident Inspector. R1DO (Holody) notified.
05:53:00, 20 April 2009 +
45,001 +
05:09:00, 20 April 2009 +
05:53:00, 20 April 2009 +
On 4/20/09 at 0153 hours, while in Mode 3 … On 4/20/09 at 0153 hours, while in Mode 3 performing a plant cooldown for a refueling outage, a control room operator noted that the 'B' train steam supply (TV-1MS-105B) to the steam driven auxiliary feedwater pump, FW-P-2, was open. This caused the steam driven auxiliary feedwater pump to start and inject auxiliary feedwater into the steam generators. This was an unexpected condition. The start of the FW-P-2 auxiliary turbine driven feedwater pump is reportable under 10CFR50.72(b)(3)(iv)(A).</br>At 0209, TV-1MS-105B was closed. The steam driven auxiliary feedwater pump was declared inoperable and Technical Specification action statements were entered. Technical Specification 3.7.5 Condition B requires the pump to be restored to operable status within 72 hours or be in Mode 4 within the following 18 hours.</br>Mode 4 was entered on 4/20/09 at 0347 hours. The steam drive auxiliary feedwater pump is not required to be operable in Mode 4. Technical Specification 3.7.5 Condition B was exited on 4/20/09 at 0347.</br>Investigation is in progress to determine the cause of TV-1MS-105B opening.</br>The licensee notified the NRC Resident Inspector.</br>* * * UPDATE ON 5/13/09 AT 1021 EDT TO RETRACT ORIGINAL EVENT AND REPORT AS INVALID ACTUATION FROM MATTY TO HUFFMAN * * *</br>This notification retracts 10 CFR 50.72 Event Notification No. 45001 since the actuation that was reported has subsequently been determined to be invalid.</br>On April 20, 2009, Beaver Valley Power Station Unit 1 (BVPS-1) was in Mode 3 and being shutdown in preparation for a refueling outage. At 0153 hours, one steam supply isolation valve (TV-1 MS-105B) to the steam-driven Auxiliary Feedwater System Pump (FW-P-2) unexpectedly opened at BVPS-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-driven turbine. This actuation was reported in NRC Event Notification No. 45001.</br>This start of the steam-driven Auxiliary Feedwater Pump was not valid. There was no adverse Steam Generator water levels, no Safety Injection signal, and no Reactor Coolant Pump undervoltage condition which could have caused an Auxiliary Feedwater Pump start. No maintenance or tests were ongoing with the Auxiliary Feedwater System at the time. After observing that there was no demand for this Auxiliary Feedwater System pump to be operating, the control room crew closed the steam supply isolation valve from the control room at 0209 hours, terminating operation of this auxiliary feedwater pump.</br>A follow-up problem solving team investigation did not identify any deficiencies within the solid state protection system. The most likely cause involved a degraded control room benchboard switch for TV-1 MS-105B. The physical degradation of the control switch would have allowed for the unplanned opening of the steam supply to the Auxiliary Feedwater Pump. This benchboard switch has been replaced and satisfactorily tested.</br>This event is being retracted since the Auxiliary Feedwater Pump actuation was not valid and therefore not reportable pursuant to 10 CFR 50.72(b)(3)(iv)(A) as previously reported.</br>This event is, however, reportable pursuant to 10 CFR 50.73(a)(2)(iv)(A) since it involved an actuation of a PWR Auxiliary Feedwater system train as listed per 10 CFR 50.73(a)(2)(iv)(B)(6). 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 has notified the NRC Resident Inspector. R1DO (Holody) notified.sident Inspector. R1DO (Holody) notified.
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
0.00177 d (0.0425 hours, 2.529762e-4 weeks, 5.82165e-5 months) +, 8.333333e-4 d (0.02 hours, 1.190476e-4 weeks, 2.7396e-5 months) +, 2.083333e-4 d (0.005 hours, 2.97619e-5 weeks, 6.849e-6 months) +, 0.00402 d (0.0964 hours, 5.737434e-4 weeks, 1.320335e-4 months) + and 0.00242 d (0.0581 hours, 3.455688e-4 weeks, 7.95245e-5 months) +
00:00:00, 14 May 2009 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
02:12:05, 2 March 2018 +
05:09:00, 20 April 2009 +
false +
false +
-0.0304 d (-0.73 hours, -0.00435 weeks, -9.99954e-4 months) +
05:53:00, 20 April 2009 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.