ML22089A022
| ML22089A022 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/29/2022 |
| From: | Mahesh Chawla NRC/NRR/DORL/LPL4 |
| To: | Elwood T AmerenUE |
| References | |
| L-2021-LLA-0197 | |
| Download: ML22089A022 (7) | |
Text
From: Chawla, Mahesh Sent: Tuesday, March 29, 2022 5:51 PM To: 'Elwood, Thomas B' Cc: Kleeh, Edmund; Morton, Wendell; Brown, Adrienne; Dixon-Herrity, Jennifer; Sun, Summer; Russell, Andrea; Circle, Jeff; Wu, De; Tetter, Keith; Hsu, Kaihwa; Li, Ming; Roggenbrodt, William; Scully, Derek; Pulvirenti, April; Khan, Nadim; Li, Chang
Subject:
Callaway Plant, Unit 1 - LAR to Adopt TSTF-505 and TSTF-439 - Follow up clarifications for the audit questions - EPID L-2021-LLA-0197 Attachments: Callaway TSTF 505 -Electrical Follow-up Audit Questions.docx; Follow-up Clarifications for Callaway_Table.docx
Dear Mr. Elwood,
By application dated October 21, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21294A393), as supplemented by letter da ted November 24, 2021 (ADAMS Accession No. ML21328A182), Union Electric Company, dba Ameren Missouri (the licensee), submitted a license amendment request (LAR) for Callaway Plant, Unit No. 1 (Callaway). The proposed amendment would modify the Callaway Technical Specifications (TSs) to implement risk-informed completion times and the Risk-Informed Completion Time Program in accordance with Technical Specifications Task Force (TSTF) Traveler TSTF-505, Provide Risk-Informed Extended Completion Times - RITSTF [Risk-Informed TSTF] Initiative 4b, Revision 2. In support of the adoption of TSTF-505, the licensee also would adopt TSTF-439, Revision 2, Eliminate Second Completion Times Limiting Time from Discovery of Failure to Meet an LCO
[Limiting Condition for Operation], which involves the elimination of second completion times currently specified in the TSs. In addition, the proposed amendment would remove obsolete one-time completion times contained in the Callaway TSs.
On February 18, 2022 (ADAMS Accession No. ML22048A002), the U.S. Nuclear Regulatory Commission (NRC) staff issued an audit plan that conveyed intent to conduct a regulatory audit to support its review of the subject license amendment. On March 7, 2022 (ADAMS Accession No. ML22061A004), NRC issued audit questions for the regulatory audit. The regulatory audit virtual meeting was conducted from March 22 through March 24, 2022. During the audit meeting, the NRC staff from the electrical branch discussed 11 audit questions with the licensee. After the discussion it was deemed necessary by the NRC staff to provide further clarification on some of the audit questions in order to remove any ambiguity in the write up provided in the submittal. The purpose of the following update is to provide NRC staffs understanding of the as-built electrical distribution at Callaway as shown on the drawings. The NRC staff would like the licensee to provide update in the supplemented information on the docket.
In case of any further clarification is needed on the updated audit questions, you can contact me. Thanks
Sincerely, Mahesh Chawla, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ph: 301-415-8371 Docket No. 50-483
OFFICEDORL/LPL4 /PM DORL/LPL4/BC JDixon-NAMEMChawla Herrity 03/29 DATE03/28/22 /22
Hearing Identifier: NRR_DRMA Email Number: 1577
Mail Envelope Properties (SA1PR09MB841570E47E62EB322AB94475F11E9)
Subject:
Callaway Plant, Unit 1 - LAR to Adopt TSTF-505 and TSTF-439 - Follow up clarifications for the audit questions - EPID L-2021-LLA-0197 Sent Date: 3/29/2022 5:51:25 PM Received Date: 3/29/2022 5:51:26 PM From: Chawla, Mahesh
Created By: Mahesh.Chawla@nrc.gov
Recipients:
"Kleeh, Edmund" <Edmund.Kleeh@nrc.gov>
Tracking Status: None "Morton, Wendell" <Wendell.Morton@nrc.gov>
Tracking Status: None "Brown, Adrienne" <Adrienne.Driver@nrc.gov>
Tracking Status: None "Dixon-Herrity, Jennifer" <Jennifer.Dixon-Herrity@nrc.gov>
Tracking Status: None "Sun, Summer" <Summer.Sun@nrc.gov>
Tracking Status: None "Russell, Andrea" <Andrea.Russell@nrc.gov>
Tracking Status: None "Circle, Jeff" <Jeff.Circle@nrc.gov>
Tracking Status: None "Wu, De" <De.Wu@nrc.gov>
Tracking Status: None "Tetter, Keith" <Keith.Tetter@nrc.gov>
Tracking Status: None "Hsu, Kaihwa" <Kaihwa.Hsu@nrc.gov>
Tracking Status: None "Li, Ming" <Ming.Li@nrc.gov>
Tracking Status: None "Roggenbrodt, William" <William.Roggenbrodt@nrc.gov>
Tracking Status: None "Scully, Derek" <Derek.Scully@nrc.gov>
Tracking Status: None "Pulvirenti, April" <April.Pulvirenti@nrc.gov>
Tracking Status: None "Khan, Nadim" <Nadim.Khan@nrc.gov>
Tracking Status: None "Li, Chang" <Chang.Li@nrc.gov>
Tracking Status: None
"'Elwood, Thomas B'" <TElwood@ameren.com>
Tracking Status: None
Post Office: SA1PR09MB8415.namprd09.prod.outlook.com
Files Size Date & Time MESSAGE 2631 3/29/2022 5:51:26 PM Callaway TSTF 505 -Electrical Follow-up Audit Questions.docx 31261 Follow-up Clarifications for Callaway_Table.docx 39330
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CALLAWAY TSTF 505 - ELECTRICAL FOLLOW-UP AUDIT QUESTIONS
- 1. LCO 3.8.4, Condition A - Clarify in Columns 3 and 6 of LAR Table E1-1 that subsystems refers to Train A and Train B as stated on page B 3.8.4-1 and LCO 3.8.4.
- 2. LCO 3.8.1, Condition B - Clarify in Columns 3 and 6 of LAR Table E1-1 the two onsite standby power sources are for Train A and Train B as stated on pages B 3.8.1-1 and B 3.8.1-3 and page LCO 3.8.1.
- 3. Closed - With agreement that the Design Success Criteria for TS 3.8.1.D should be corrected to one offsite circuit OR one of two EDGs.
- 4. LAR Table E1-1 for TS 3.8.1.F
- a. Closed - no supplement needed
- b. Clarify in Columns 3 and 6 of LAR table E1-1 that Train A and Train B, each have an LSELS as stated on page B 3.8.1 -4 and LCO 3.8.1.
- 5. Closed - no supplement needed
- 6. LCO 3.8.7, Condition A - Clarify in Columns 3 and 6 of LAR Table E1-1 that there are two inverters per Train A and Train B as stated on pages B 3.8.7-1 and B 3.8.7-3 and LCO 3.8.7. No supplement needed for remainder of items in original question.
- 7. LCO 3.8.9, Condition A - Clarify in Columns 3 and 6 of LAR Table E1-1 that subsystems refers to Train A and Train B as stated on page B 3.8.9-1 and LCO 3.8.9.
- 8. LCO 3.8.9, Condition B - Clarify in Columns 3 and 6 of LAR Table E1-1 that subsystems refers to Train A and Train B as stated on pages B 3.8.9-1 and B 3.8.9-9 and LCO 3.8.9 and that there are two vital AC buses per train.
- 9. LCO 3.8.9, Condition C - Clarify in Columns 3 and 6 of LAR table E1-1 that subsystems refers to Train A and Train B as stated on page B 3.8.9-1 and LCO 3.8.9.
- 10. Closed - no supplement needed
- 11. Closed - licensee response added to the supplement
- 12. New audit question - LCO 3.8.1, Condition A - Clarify in Columns 3 and 6 of LAR Table E1-1 the two offsite power circuits for preferred offsite source connection are for Train A and Train B as stated on pages B 3.8.1-1 and B 3.8.1-3 and page LCO 3.8.1.
EEEB Follow-up Questions (Proposed Changes Highlighted in Red)
EEEB LCO Column 3 of Table Column 6 of Revise Question E1-1 Table E-1 1 3.8.4 Two DC electrical power One of two DC Condition A subsystems (Trains A electrical power and B) each consisting subsystems available of two DC batteries, two (Train A or B) battery chargers, one swing battery charger, and all the associated control equipment and interconnecting cabling 2 3.8.1 Two EDGs (one each 1 One of 2 EDGs ((for LCO 3.8.1, Condition B for Trains A and B) Train A or B) capable Condition D capable of supplying of supplying onsite 1E accordingly onsite 1E AC Electrical AC Electrical Power including the OR Power Distribution Distribution System connector about System either offsite circuit or EDG 4 3.8.1 One Load Shedder and One of two LSELS for Condition F Emergency Load available.Train A or B Sequencer (LSELS) each per for 4.16kV Class 1E AC Busfor Trains A and B 6 3.8.7 Two normal inverters At least one of tTwo Condition A and one swing inverter inverters trains for each train (A and B) available.
One train of inverters consists of either (two normal or one normal and one swing inverter) for Train A or B.
7 3.8.9 Two AC electrical power One of two AC Condition A distribution subsystems electrical power (Trains A and B) with distribution associated buses and subsystems (Train A or load centers energized B) to their proper voltages
8 3.8.9 Two AC vital bus One of two AC vital bus Condition B subsystems (Trains A and distribution subsystems B with two vital buses (Train A or Train B) with each) with associated two vital buses each buses energized to their proper voltage, each from its associated normal source inverter or swing inverter, via inverted DC voltage or the alternate AC source (i.e., bypass constant voltage transformer
9 3.8.9 Two DC electrical power One of two DC electrical Condition C distribution subsystems power distribution (Trains A and B) with subsystems (Train A or associated buses B) energized to their proper voltage from either the associated battery or charger.
New 3.8.1 Two qualified circuits One qualified circuit LCO 3.8.1, Condition A between the offsite between the offsite Conditions C and transmission network and transmission network and D accordingly the onsite 1E AC Electrical the onsite 1E AC Power Distribution System. Electrical Power (one for Train A and the Distribution System.
other one for Train B) (for Train A or B)