ML20161A408
| ML20161A408 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/09/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL |
| References | |
| Download: ML20161A408 (3) | |
Text
From:
Schiller, Alina Sent:
Tuesday, June 9, 2020 5:13 PM To:
Vogtle PEmails
Subject:
6/11/20 Vogtle Units 3 and 4 Public Meeting, LAR-20-003, TS 3.3.13 for MCR VES Instrumentation Applicability Change and Include Undervoltage Actuation June 11, 2020 Vogtle Units 3 and 4 Public Meeting LAR 20-003, TS 3.3.13 for MCR VES Instrumentation Applicability Change and Include Undervoltage Actuation - Discussion points
- 1. The third bullet under Section 1.B on Page 3 of Enclosure 1 says, in part, that De-energization of Main Control Room air supply radiation monitor sample pumps occurs on an extended undervoltage to Class 1E 24-hour battery chargers coincident with Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization actuation signal. Is the de-energization of Main Control Room air supply radiation monitor sample pumps independent from, (not coincident with), Main Control Room Isolation, Air Supply Initiation, and Electrical Load De-energization actuation signal?
- 2. It says, in part, on Page 4 of Enclosure 1 that When MCR Isolation AND Class 1E 24-hour battery charger undervoltage signals from the PMS are both present for greater than 600 seconds, then a hardware output signal is sent to deenergize. Why is the proposed 600 seconds delay not reflected in the changed logic diagram shown on Page 2 of ?
- 3. On Page 11 of Enclosure 1, the licensee proposed to change Class 1E battery chargers to Class 1E 24-hour battery chargers. Why is this proposed change not reflected on the changed logic diagram on Page 2 of Enclosure 2?
- 4. The licensee stated that the existing design that controls the heat loads in the zones containing safety-related equipment within auxiliary building rooms outside the Main Control Room Envelope to be less than the limits used in qualifying the equipment for their required operating times following a Design Basis Accident, thus the requirements of 10 CFR 50.49 remain satisfied. However, the licensee did not identify the impact the proposed change had on temperature, pressure, humidity, or radiation in the zones containing safety-related equipment within auxiliary building rooms. Please confirm whether the temperatures, pressures, humidity, and radiation remain bounded by the existing environmental qualification for the zones containing safety-related equipment within auxiliary building rooms that are impacted by the proposed change.
- 5. The licensee stated that the proposed changes acknowledge the existing design for maintaining I&C room temperature below equipment qualification limits and maintaining the assumed heat load for MCR habitability during an extended loss of AC event, thus GDC 4 remains satisfied. However, the licensee did not state whether structures, systems, and components important to safety are designed to accommodate the effects of and compatible with the environmental conditions associated with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents due to the proposed changes. Please confirm whether SSCs important to safety are designed to accommodate the effects of and compatible with the environmental conditions associated
with normal operation, maintenance, testing, and postulated accidents, including loss-of-coolant accidents due to the proposed changes.
Hearing Identifier:
Vogtle_COL_Docs_Public Email Number:
572 Mail Envelope Properties (BL0PR0901MB43247569919A502B45AFD0D396820)
Subject:
6/11/20 Vogtle Units 3 and 4 Public Meeting, LAR-20-003, TS 3.3.13 for MCR VES Instrumentation Applicability Change and Include Undervoltage Actuation Sent Date:
6/9/2020 5:12:45 PM Received Date:
6/9/2020 5:12:47 PM From:
Schiller, Alina Created By:
Alina.Schiller@nrc.gov Recipients:
"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>
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