ML17018A193
| ML17018A193 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/09/2016 |
| From: | Distel D Exelon Corp |
| To: | Tekia Govan Japan Lessons-Learned Division |
| References | |
| Download: ML17018A193 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Distel, David J:(GenCo-Nuc) <David.Distel@exeloncorp.com>
Sent:
Friday, December 09, 2016 8:48 AM To:
Govan, Tekia Cc:
Wehrman, Robert:(GenCo-Nuc); Markle, Craig S:(GenCo-Nuc); Lyter, Jay W:(GenCo-Nuc); Joe Bellini; Behrend, Chuck L.:(GenCo-Nuc); Budock, George P:(GenCo-Nuc)
Subject:
[External_Sender] Limerick Flood MSA Question Tekia - As a follow up to the December 8, 2016 NRC Flood MSA Audit review call for Limerick Station, Exelon is providing the following additional information to address the Limerick Flood MSA timeline:
Summary of Limerick FLEX Electrical Strategy Following the load shed, Division 1 station battery lasts approximately 7.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />, and the Limerick FLEX timelines were based on setup being complete with the battery charger reenergized by hour 7.0 to have margin. Limerick also assumed no actions were started for FLEX setup for the 1st hour post event. This allowed the crew to diagnosis the event and declare the ELAP.
This leaves 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to setup the FLEX generators, run cables and do in plant alignments (in plant work not affected by LIP) to energize the battery chargers.
Both the primary and alternate FLEX electrical strategies were reviewed and the alternate strategy was selected, since this had the longer setup timeline. From the FLEX timeline, validated per the NEI requirements, the alternate electrical strategy required 3.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> to set up the generator and cables to re-energize the station battery chargers.
This leaves a margin of 2.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />. (6 hrs - 3.5 hrs (setup time))= margin The MSA flood submittal concluded that approximately an hour delay could be incurred due to LIP flood impacting FLEX setup activities in the south yard area of the plant. This provides at least 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> of margin to successfully setup electrical generators and perform tie-ins even with the hour lost due to the LIP event.
This review also placed the LIP rain/flood event at the worst time, right when the operators were ready to begin equipment deployment activities in the south yard area and had to stop all outdoor work for an hour until the LIP passed.
Please let me know if any additional information is needed.
Thanks.
Dave Distel This Email message and any attachment may contain information that is proprietary, legally privileged, confidential and/or subject to copyright belonging to Exelon Corporation or its affiliates ("Exelon"). This Email is intended solely for the use of the person(s) to which it is addressed. If you are not an intended recipient, or the employee or agent responsible for delivery of this Email to the intended recipient(s), you are hereby notified that any dissemination, distribution or copying of this Email is strictly prohibited. If you have received this message in error, please immediately notify the sender and permanently delete this Email and any copies.
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Hearing Identifier:
NRR_PMDA Email Number:
3273 Mail Envelope Properties (4BCCAD574B0D614096E6221C12ED97D8B4A3446E)
Subject:
[External_Sender] Limerick Flood MSA Question Sent Date:
12/9/2016 8:47:42 AM Received Date:
12/9/2016 8:47:46 AM From:
Distel, David J:(GenCo-Nuc)
Created By:
David.Distel@exeloncorp.com Recipients:
"Wehrman, Robert:(GenCo-Nuc)" <Robert.Wehrman@exeloncorp.com>
Tracking Status: None "Markle, Craig S:(GenCo-Nuc)" <craig.markle@exeloncorp.com>
Tracking Status: None "Lyter, Jay W:(GenCo-Nuc)" <jay.lyter@exeloncorp.com>
Tracking Status: None "Joe Bellini" <joe.bellini@aterrasolutions.com>
Tracking Status: None "Behrend, Chuck L.:(GenCo-Nuc)" <chuck.behrend@exeloncorp.com>
Tracking Status: None "Budock, George P:(GenCo-Nuc)" <George.Budock@exeloncorp.com>
Tracking Status: None "Govan, Tekia" <Tekia.Govan@nrc.gov>
Tracking Status: None Post Office:
exchm-omf-24.exelonds.com Files Size Date & Time MESSAGE 2835 12/9/2016 8:47:46 AM Options Priority:
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