ML16006A367
| ML16006A367 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/22/2015 |
| From: | Lashley P First Energy Services |
| To: | Blake Purnell Plant Licensing Branch III |
| References | |
| Download: ML16006A367 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Lashley, Phil H. <phlashley@firstenergycorp.com>
Sent:
Tuesday, December 22, 2015 8:37 AM To:
Purnell, Blake Cc:
Haskell, Russell
Subject:
[External_Sender] RE: Davis-Besse EDG LAR The 4070V (3990+2%) value is required by the permissive relays to close the EDG output breaker and energize the bus. This voltage is taken at the EDG bus and not the 4160kV unit substation bus. The EDG Transient Response Analysis assumes 3990V is the voltage when the EDG output breaker closes. Assumption 4.1.3 shown on page 1 of Appendix 5 in the attachment of the October 14, 2015 RAI response letter provides clarification on the use of the value of 3990V and states that the tolerance of the EDG breaker closure permissive relay is not discussed in the calculation because its impact on the voltage and frequency response during transient loading is insignificant. As such, a more restrictive value of 4070V (3990+2%) is used to ensure the EDG breaker has the appropriate voltage to close and energize the bus in less than or equal to 10 seconds. The analysis demonstrates that with an initial EDG voltage of 3990V (at breaker closure) and with the EDG automatic voltage regulator set at 4088V, the EDG will provide sufficient voltage during the starting transient to ensure the ability to start and run required loads.
Upon closure of the EDG output breaker, the EDG voltage regulator will then regulate the output voltage of the EDG to a specified value of 4088V. To satisfy safety guide 9 criteria, a minimum steady state value of 4088V is required.
Stated in terms of the specific surveillance requirements:
The EDG voltage of 4031VAC in Technical Specification Surveillance Requirements 3.8.1.8 (a) and 3.8.1.14 (a) are being revised from 4031VAC to 4070VAC as part of this License Amendment Request. The revised TS SR voltage value (3990VAC +2%) bounds the minimum voltage required to satisfy the voltage permissive relay and close the EDG output breaker in 10 seconds or less.
Also, the steady-state voltage of 3744VAC, specified in Technical Specification Surveillance Requirements 3.8.1.2, 3.8.1.8.b, 3.8.1.11.c.3, 3.8.1.14.b, and 3.8.1.15.c.3, is being revised from 3744VAC to 4088VAC as part of this License Amendment Request. The revised TSSR voltage value (EDG Voltage Regulator Setpoint of 4088VAC) results in transient voltage and frequency values that satisfy the requirements established in Safety Guide 9.
Respectfully, Phil H. Lashley Fleet Licensing Supervisor Cell: (330) 696-7208 Office: (330) 315-6808 Mail Stop: A-WAC-B1 From: Purnell, Blake [1]
Sent: Friday, December 18, 2015 10:07 AM
2 To: Lashley, Phil H.
Cc: Lentz, Thomas A. (Licensing)
Subject:
- Phil, Our understanding of the statements made by your staff is as follows:
The minimum BUS VOLTAGE of 4070V provides assurance that Safety Guide 9 criteria is satisfied. This corresponds to approximately 4088V at the EDG terminals. The detailed analyses that demonstrates this parameter is proprietary and not available.
Please confirm: The MPR analyses assumed 4088V at the EDG terminals and NOT at the 4160V bus.
- Thanks, Blake Purnell Project Manager NRR/DORL/LPL3-2 ph: 301-415-1380 The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
Hearing Identifier:
NRR_PMDA Email Number:
2576 Mail Envelope Properties (CY1PR0501MB154727CE8EDF052984DB01F1BDE50)
Subject:
[External_Sender] RE: Davis-Besse EDG LAR Sent Date:
12/22/2015 8:37:14 AM Received Date:
12/22/2015 8:38:52 AM From:
Lashley, Phil H.
Created By:
phlashley@firstenergycorp.com Recipients:
"Haskell, Russell" <Russell.Haskell@nrc.gov>
Tracking Status: None "Purnell, Blake" <Blake.Purnell@nrc.gov>
Tracking Status: None Post Office:
CY1PR0501MB1547.namprd05.prod.outlook.com Files Size Date & Time MESSAGE 3703 12/22/2015 8:38:52 AM Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
1 NRR-PMDAPEm Resource From:
Lashley, Phil H. <phlashley@firstenergycorp.com>
Sent:
Tuesday, December 22, 2015 8:37 AM To:
Purnell, Blake Cc:
Haskell, Russell
Subject:
[External_Sender] RE: Davis-Besse EDG LAR The 4070V (3990+2%) value is required by the permissive relays to close the EDG output breaker and energize the bus. This voltage is taken at the EDG bus and not the 4160kV unit substation bus. The EDG Transient Response Analysis assumes 3990V is the voltage when the EDG output breaker closes. Assumption 4.1.3 shown on page 1 of Appendix 5 in the attachment of the October 14, 2015 RAI response letter provides clarification on the use of the value of 3990V and states that the tolerance of the EDG breaker closure permissive relay is not discussed in the calculation because its impact on the voltage and frequency response during transient loading is insignificant. As such, a more restrictive value of 4070V (3990+2%) is used to ensure the EDG breaker has the appropriate voltage to close and energize the bus in less than or equal to 10 seconds. The analysis demonstrates that with an initial EDG voltage of 3990V (at breaker closure) and with the EDG automatic voltage regulator set at 4088V, the EDG will provide sufficient voltage during the starting transient to ensure the ability to start and run required loads.
Upon closure of the EDG output breaker, the EDG voltage regulator will then regulate the output voltage of the EDG to a specified value of 4088V. To satisfy safety guide 9 criteria, a minimum steady state value of 4088V is required.
Stated in terms of the specific surveillance requirements:
The EDG voltage of 4031VAC in Technical Specification Surveillance Requirements 3.8.1.8 (a) and 3.8.1.14 (a) are being revised from 4031VAC to 4070VAC as part of this License Amendment Request. The revised TS SR voltage value (3990VAC +2%) bounds the minimum voltage required to satisfy the voltage permissive relay and close the EDG output breaker in 10 seconds or less.
Also, the steady-state voltage of 3744VAC, specified in Technical Specification Surveillance Requirements 3.8.1.2, 3.8.1.8.b, 3.8.1.11.c.3, 3.8.1.14.b, and 3.8.1.15.c.3, is being revised from 3744VAC to 4088VAC as part of this License Amendment Request. The revised TSSR voltage value (EDG Voltage Regulator Setpoint of 4088VAC) results in transient voltage and frequency values that satisfy the requirements established in Safety Guide 9.
Respectfully, Phil H. Lashley Fleet Licensing Supervisor Cell: (330) 696-7208 Office: (330) 315-6808 Mail Stop: A-WAC-B1 From: Purnell, Blake [2]
Sent: Friday, December 18, 2015 10:07 AM
2 To: Lashley, Phil H.
Cc: Lentz, Thomas A. (Licensing)
Subject:
- Phil, Our understanding of the statements made by your staff is as follows:
The minimum BUS VOLTAGE of 4070V provides assurance that Safety Guide 9 criteria is satisfied. This corresponds to approximately 4088V at the EDG terminals. The detailed analyses that demonstrates this parameter is proprietary and not available.
Please confirm: The MPR analyses assumed 4088V at the EDG terminals and NOT at the 4160V bus.
- Thanks, Blake Purnell Project Manager NRR/DORL/LPL3-2 ph: 301-415-1380 The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
Hearing Identifier:
NRR_PMDA Email Number:
2576 Mail Envelope Properties (CY1PR0501MB154727CE8EDF052984DB01F1BDE50)
Subject:
[External_Sender] RE: Davis-Besse EDG LAR Sent Date:
12/22/2015 8:37:14 AM Received Date:
12/22/2015 8:38:52 AM From:
Lashley, Phil H.
Created By:
phlashley@firstenergycorp.com Recipients:
"Haskell, Russell" <Russell.Haskell@nrc.gov>
Tracking Status: None "Purnell, Blake" <Blake.Purnell@nrc.gov>
Tracking Status: None Post Office:
CY1PR0501MB1547.namprd05.prod.outlook.com Files Size Date & Time MESSAGE 3703 12/22/2015 8:38:52 AM Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received: