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A non-conservative error was identified in … A non-conservative error was identified in the Proto-Flo input calculation FC06644 for LPSI (Low Pressure Safety Injection) flow post-RAS (recirculation actuation signal). The calculation used an incorrect (non-conservative) input for LPSI pump performance. Also, the associated procedure (EOP/AOP Attachment 11) as written does not provide adequate direction during the Alternate Hot Leg Injection mode of operation. </br>EOP/AOP Attachment 11 (Alternate Hot Leg Injection) used 140 psia as the entry point. The LPSI pumps may not be able to meet minimum flow requirements at this pressure, affecting core cooling and possibly resulting in pump damage. Also the EOP/AOP attachment directs the operator to verify that flow is approximately 400 gpm as indicated on FIC-326. If 400 gpm cannot be achieved the contingency is to open any LPSI loop injection isolation valve. This step would not depressurize the RCS low enough to allow the 400 gpm flow rate to be achieved which would cause insufficient flow. </br>Therefore, it is reasonable to conclude that the referenced procedural guidance may not be able to complete the safety function of providing adequate core cooling during the Alternate Hot Leg Injection mode of operation under a worst case scenario.</br>Therefore, this condition is an unanalyzed condition and reportable under 10CFR50.72(b)(3)(ii)(B).</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
14:00:00, 25 April 2012 +
47,862 +
17:22:00, 25 April 2012 +
14:00:00, 25 April 2012 +
A non-conservative error was identified in … A non-conservative error was identified in the Proto-Flo input calculation FC06644 for LPSI (Low Pressure Safety Injection) flow post-RAS (recirculation actuation signal). The calculation used an incorrect (non-conservative) input for LPSI pump performance. Also, the associated procedure (EOP/AOP Attachment 11) as written does not provide adequate direction during the Alternate Hot Leg Injection mode of operation. </br>EOP/AOP Attachment 11 (Alternate Hot Leg Injection) used 140 psia as the entry point. The LPSI pumps may not be able to meet minimum flow requirements at this pressure, affecting core cooling and possibly resulting in pump damage. Also the EOP/AOP attachment directs the operator to verify that flow is approximately 400 gpm as indicated on FIC-326. If 400 gpm cannot be achieved the contingency is to open any LPSI loop injection isolation valve. This step would not depressurize the RCS low enough to allow the 400 gpm flow rate to be achieved which would cause insufficient flow. </br>Therefore, it is reasonable to conclude that the referenced procedural guidance may not be able to complete the safety function of providing adequate core cooling during the Alternate Hot Leg Injection mode of operation under a worst case scenario.</br>Therefore, this condition is an unanalyzed condition and reportable under 10CFR50.72(b)(3)(ii)(B).</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 25 April 2012 +
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14:00:00, 25 April 2012 +
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