PWRRM October 2007

pwrrm@retaqs.com

6 participants
4 discussions

Actual vs. Predicted ECP values
by John.F.Helfenberger＠dom.com 18 Oct '07

18 Oct '07

What do the other sites typically have for pcm differences in ECP actual vs. predicted? Kewaunee recently had a MOL startup and we were about 175 pcm out from predicted, which is well within our procedural acceptance criteria of +/-400 pcm. On the previous 2 startups at BOL, we were within 25 pcm of predicted. What are typical values seen by other plants? John Helfenberger, Lead Reactor Engineer Kewaunee Power Station Phone: 920-388-8294 Dominion Tie-line: 8-691-8294 Pager: 920-704-4471 ----------------------------------------- CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and/or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.

2 1

Paul V. Gurney/NAESCO is out of the office.
by paul_gurney＠fpl.com 17 Oct '07

17 Oct '07

I will be out of the office starting 10/15/2007 and will not return until 10/22/2007.

1 0

Rod Insertion Limits vs. Shutdown Margin
by BRYSON, DAMON V 03 Oct '07

03 Oct '07

This question is for the Westinghouse crowd. We at VC Summer have recently found some inconsistencies between our Rod Insertion Limit (RIL) Lo-Lo alarm and our RIL in the Core Operating Limits Report (COLR). For all control banks besides the lead bank, the installed RIL alarm setpoint is at 213 steps, while our COLR limit is 230 steps. The COLR limit is consistent with our reload shutdown margin analysis, which assumes all rods except the lead bank at 230 steps (the all rods out position). As far as we can tell, our alarm has always been set to 213 for all previous cycles. In previous cycles the COLR only listed the lead bank limit, but no limits for other banks. We placed that limit in the COLR based on our analysis assumptions. Do other plants use similar setpoints? I know many plants have repositioning strategies that require rod motion during the cycle, but our plant does not. I also haven't found any mention of the RIL alarm in the Westinghouse reload design process checklists. My control room operators want some justification for this discrepancy, since I just taught them in our last requal session that the purpose of the RIL alarm is to verify you have shutdown margin. Thanks for any help you can give... Damon Bryson dbryson(a)scana.com 803-345-4814

2 1

RE: [Pwrrm] Rod Insertion Limits vs. Shutdown Margin
by ALDAY, CLINT L 02 Oct '07

02 Oct '07

Waterford (CE NSSS) has the alarms set same as COLR limits, and if the COLR changes we change the alarm. Clint Alday -----Original Message----- From: pwrrm-bounces(a)retaqs.com [mailto:pwrrm-bounces@retaqs.com] On Behalf Of BRYSON, DAMON V Sent: Tuesday, October 02, 2007 4:23 PM To: PWR Reactivity Management Subject: [Pwrrm] Rod Insertion Limits vs. Shutdown Margin This question is for the Westinghouse crowd. We at VC Summer have recently found some inconsistencies between our Rod Insertion Limit (RIL) Lo-Lo alarm and our RIL in the Core Operating Limits Report (COLR). For all control banks besides the lead bank, the installed RIL alarm setpoint is at 213 steps, while our COLR limit is 230 steps. The COLR limit is consistent with our reload shutdown margin analysis, which assumes all rods except the lead bank at 230 steps (the all rods out position). As far as we can tell, our alarm has always been set to 213 for all previous cycles. In previous cycles the COLR only listed the lead bank limit, but no limits for other banks. We placed that limit in the COLR based on our analysis assumptions. Do other plants use similar setpoints? I know many plants have repositioning strategies that require rod motion during the cycle, but our plant does not. I also haven't found any mention of the RIL alarm in the Westinghouse reload design process checklists. My control room operators want some justification for this discrepancy, since I just taught them in our last requal session that the purpose of the RIL alarm is to verify you have shutdown margin. Thanks for any help you can give... Damon Bryson dbryson(a)scana.com 803-345-4814

1 0

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

PWRRM October 2007