ML15259A584
| ML15259A584 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/15/2015 |
| From: | Weber T Arizona Public Service Co |
| To: | Balwant Singal Plant Licensing Branch IV |
| References | |
| TAC MF6603, TAC MF6604, TAC MF6605 | |
| Download: ML15259A584 (23) | |
Text
1 NRR-PMDAPEm Resource From:
Thomas.N.Weber@aps.com Sent:
Tuesday, September 15, 2015 10:04 PM To:
Singal, Balwant Cc:
Watford, Margaret; Klos, John
Subject:
[External_Sender] Degraded Voltage Public Meeting Next Tuesday (Sept 22, 2015)
Attachments:
NRC PSM for DVR Sept 22 rev C.pptx
- Balwant, I understand that Maggie and John are both in training this week, so you are helping out in preparation for our public meeting next week on our degraded voltage License Amendment Request that we are preparing in response to our commitment last year. I have a few things for you as noted below:
- 1. I have attached the slides we intend to use for the public meeting. I believe you are going to add them to the public meeting notice.
- 2. I am bringing my laptop to use for the presentation, but we will need a projector and cables to connect to the laptop. I am assuming the conference room that we are in has an overhead screen that we will be able to use to show the slide. I also understand the conference room is in Three White Flint.
- 3. I sent a list to Maggie of the people that we are bringing to the public meeting so that she could get them pre-badged. We are now bringing one extra person who I did not previously identify. His name is Kyle Wiedeman.
Can you add him to the list so that he will be pre-badged?
- a. The names of the people that I previously provided are: Thomas Weber, George Andrews, Dennis Bence, Bradley Berles, Kent Bjornn, Robert Doyle, Arthur Amorosa
- 4. We have a drop-in already set up with Mike Markley and Maggie on Monday, September 21 at 9:00 am. The following four people from our group will be coming on the drop-in:
- a. Thomas Weber, George Andrews, Bradley Berles, Dennis Bence
- 5. Our Regulatory Affairs Vice President signed the RAI response for our exigent LAR today. You should have received an email from our administrative person, Anissa Fogel. We now are using the Electronic Information Exchange (EIE) process for submittal of correspondence so the RAI response for our exigent LAR is now in ADAMS and has the following ID-- ML15258A848. Let me know if there are any questions on this.
- 6. We will call in to the bridge line that Maggie set up for our weekly call tomorrow morning. If you can call in that would be great.
Do not hesitate to contact me if you have any comments or questions.
- thanks, TN Weber Department Leader Regulatory Affairs PVNGS 623-393-5764 (office) 602-615-2131 (cell)
Hearing Identifier:
NRR_PMDA Email Number:
2388 Mail Envelope Properties (EB0C94E90ED2EF409E17260ECE38B14E06AB611E)
Subject:
[External_Sender] Degraded Voltage Public Meeting Next Tuesday (Sept 22, 2015)
Sent Date:
9/15/2015 10:04:28 PM Received Date:
9/15/2015 10:04:46 PM From:
Thomas.N.Weber@aps.com Created By:
Thomas.N.Weber@aps.com Recipients:
"Watford, Margaret" <Margaret.Watford@nrc.gov>
Tracking Status: None "Klos, John" <John.Klos@nrc.gov>
Tracking Status: None "Singal, Balwant" <Balwant.Singal@nrc.gov>
Tracking Status: None Post Office:
ntm211.apsc.com Files Size Date & Time MESSAGE 2237 9/15/2015 10:04:46 PM NRC PSM for DVR Sept 22 rev C.pptx 1945041 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
License Amendment Request D
d d V lt R l Ti D l Degraded Voltage Relay Time Delay NRC Pre submittal Meeting NRC Pre-submittal Meeting September 22, 2015
Agenda
- Overview Thomas Weber
- Palo Verde Switchyard Dennis Bence
- Regulatory Summary Thomas Weber
- Design Change Robert Doyle
- Schedule/Closing Comments George Andrews 2
Purpose
- Commitment to NRC from 2014 NRC Focused Inspection Focused Inspection
- Provide Description of Conceptual Design f
D d d V lt R l Ti for new Degraded Voltage Relay Time Delay
- More Consistent with Industry Norms 3
Palo Verde Switchyard Palo Verde Switchyard Palo Verde Switchyard Palo Verde Switchyard Dennis Bence Unit Operations Manager
5
Transmission Network 6
7
Regulatory Summary Regulatory Summary Regulatory Summary Regulatory Summary Thomas N. Weber Department Leader Regulatory Affairs
Regulatory Timeline LER 93-011 Voluntary LER in Dec of 1993 Switchyard voltages could result in plant voltages less than 90% of nominal E t bli h d ti t
t
d i
d C diti Three License Amendments Established prevention strategy and revised Condition, Required Actions and Completion Times for TS Condition 3.8.1G Degraded voltage protection scheme unresolved item (URI) with two aspects:
CDBI unresolved item (URI) with two aspects:
voltage calculations and time delay NRC Focused Inspection in fall of 2014 ends with APS making CDBI URI Closure with APS making Commitment for LAR Pre-Submittal meeting with NRC Sept 22, 2015 1990-2000 2000-2013 2014-Present p
9
Current Licensing Requirements
- TS 3.3.7 Diesel Generator Loss of Voltage g
- SR 3.3.7.3 Channel Calibration
- Degraded Voltage Function 3697 to 3786 Volts
- 3697 to 3786 Volts
- Time delay 28.6 to 35 seconds
- Loss of Voltage Function 2929 5 V l i h i d l 10 3 12 6 d
- 2929.5 Volts with time delay 10.3 to 12.6 seconds
- 0 Volts with time delay 2.0 to 2.4 seconds 10
Current Licensing Requirements
- TS 3.8.1G
- TS Requirement from Amendment #123
- Implemented Prevention Strategy for Operator A ti ithi 1 h Action within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />
- Not in NUREG 1432, Improved Standard Technical Specifications Technical Specifications 11
Design Changes Design Changes Design Changes Design Changes Robert Doyle y
Senior Electrical Design Engineer
Proposed Change Modification Overview
- New DVR with shorter time delay (5 to 9 sec.)
- Actuates 2nd time delay, if no SIAS signal
- If SIAS signal present:
DVR i
- DVR times out
- Sends loss of power signal, ESF loads sequence onto EDG
- Accident analysis not affected
- If no SIAS signal present, longer time delay permits RCP start without concern for permits RCP start without concern for inadvertent transfer of class bus to EDG 13
Proposed Change (continued)
Modification Overview
- Current time delay allowable value (28.6 to 35 sec ) established anal tical limit as not sed sec.) established - analytical limit was not used explicitly
- Time delays:
Sh t
h t t d t
ti d
i
- Short enough to prevent damage or protective device trip due to exposure to voltage substantially below the rated value
- Long enough to avoid spurious trips from faults or other g
g p
p very short term transients
- Analytical limit reverse engineered from current TS value and verified to support criteria
- Trip setpoint calculated using current standard setpoint methodology (DVR voltage and time delays) 14
Proposed Change (continued)
- Technical Specification Changes Revised DVR Voltage allowable values
- Revised DVR Voltage allowable values
- 3706 Volts to 3773 Volts
- Two DVR Time Delays y
- Changed upper value to address relay capabilities Changed upper value to address relay capabilities
- No change to Loss of Voltage Relays 15
Proposed Change (continued)
- Technical Specification Changes
- Relocate 3.8.1G to TRM
- Makes PVNGS TS consistent with Standard TS 16
Path Forward Path Forward Path Forward Path Forward George Andrews g
Director Regulatory Affairs and Environmental
Schedule
- Target LAR submittal by Dec. 18, 2015
- Requesting 12-18 month NRC review q
g
- Two Sets of TS Pages during transition
- Prior to DVR Modification
- After DVR Modification
- Installation After NRC approval
- Implementation Plan being developed 18
Summary LAR addresses change to the degraded voltage relay time delay for DBA g
y y
conditions LAR changes PVNGS licensing bases from LAR changes PVNGS licensing bases from prevention strategy to mitigation strategy gy APS commitment to add new shorter time delay for coincident DBA to be consistent delay for coincident DBA to be consistent with industry norms 19
- Questions?
20
We SAFELY and efficiently generate electricity for the long term 21