ML20203M225
| ML20203M225 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 07/21/2020 |
| From: | NRC |
| To: | NRC/NRR/DNRL |
| References | |
| Download: ML20203M225 (6) | |
Text
From:
Schiller, Alina Sent:
Tuesday, July 21, 2020 10:33 AM To:
Vogtle PEmails
Subject:
Draft supplement for CMT Boron Concentration LAR Attachments:
LAR-20-004_Supplement_PSM.pdf Topic for 7/23/2020 public meeting with SNC Alina Schiller Project Manager Office of Nuclear Reactor Regulation Vogtle Project Office O-13 C10 301-415-8177
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Subject:
Draft supplement for CMT Boron Concentration LAR Sent Date:
7/21/2020 10:32:46 AM Received Date:
7/21/2020 10:32:52 AM From:
Schiller, Alina Created By:
Alina.Schiller@nrc.gov Recipients:
"Vogtle PEmails" <Vogtle.PEmails@nrc.gov>
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BL0PR0901MB2994.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 191 7/21/2020 10:32:52 AM LAR-20-004_Supplement_PSM.pdf 646768 Options Priority:
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Southern Nuclear Operating Company ND-20-XXXX Vogtle Electric Generating Plant (VEGP) Units 3 and 4 Supplement to Request for License Amendment:
Core Makeup Tank Boron Concentration Requirements (LAR-20-004S1)
(This Enclosure consists of 2 pages, including this cover page)
DRAFT rating Plant (VEGP) Units 3 and 4 P) Units lement to Request for License Amendme uest for License Amendme e Makeup Tank Boron Concentration Re e Makeup Tank Boron Conce (LAR-20 20-004S1 00
)
ND-20-XXXX Supplement to Request for License Amendment: Core Makeup Tank Boron Concentration Requirements (LAR-20-004S1)
Page 2 of 2 During the NRCs audit (ML20133K106) of the technical information supporting LAR-20-004, the need for clarifications was identified for the submittal based on the procedural information which supports the request. The monitoring and trending of the CMT temperature and response to unexpected changes of temperature is described and clarified in the technical evaluation and licensing basis markups provided in this supplement. This supplement does not impact the scope or conclusions of the Technical Evaluation, Significant Hazards Consideration Determination, or Environmental Considerations of the original submittal.
Page 9 of 17 of ND-20-0507 Enclosure 1 states Therefore, the CMT top high temperature alarm can indicate to the operators that there may be in-leakage and to initiate by procedure steps to identify if the CMT boron concentration remains within the required limits. In addition to responses to a high temperature alarm, it is also consistent with site procedures to monitor and trend the CMT top temperature and respond to an abnormal temperature rise before reaching the alarm setpoint. Data is recorded at least daily for SR 3.5.2.1 to confirm that safety analysis initial assumptions are met regarding CMT temperature. This data can also be used to determine whether Reactor Coolant System (RCS) water is entering a CMT. The capability is also provided to monitor and trend this data in real time using the plant computer.
Consistent with the results of the analysis of a temperature rise in the CMT, increases in CMT temperature of 5 to 10 °F within 24 to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> are consistent with a potential leak and are investigated to determine the cause of the temperature rise. Potential causes such as rise in containment temperature are considered and other indicators in the CMT (such as the temperature trend of other sensors in the CMT) are reviewed.
UFSAR Subsection 6.3.2.2.1 is revised to include language which reflects this practice as part of this supplement (see Enclosure 5 which supplements Enclosure 2 from ND-20-0507).
DRAFT R-2 nformatio nformat e and respon e and r hnical evaluation a hnical e oes not impact the scope oes not imp ideration ideration Determination, or Determ e CMT top high temperature alarm e CMT top high temperature ala and to initiate by procedure s and to initiate by procedure steps to teps to in the required limits.
in the In addition to on to sistent with site procedures to monitor and sistent with site procedures to monitor and bnormal te norma mperature rise before reaching th ure rise SR 3.5.2.1 to confirm that safety analysis in 3.5.2.1 to confirm tha ature. This data can also be used to det is data can als ter is entering a CMT.
a CMT. The capability is also Th using the plant computer.
using the plant computer.
nalysis of a temperature rise in the CMT, in ysis of a temperature rise in the CM 24 to 72 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> are consistent with a pot hours are consistent with a po cause of the temperature rise. Potential ca he temperature rise. Potential ca are considered and other indicators in t d and other indicators in r sensors in the CMT) are reviewed.
MT) are revie 6.3.2.2.1 is revised to include language whic 6.3.2.2.1 is revised to include la ee Enclosure 5 ee Enclosure 5 which supplements Enclosu which supplement
Southern Nuclear Operating Company ND-20-XXXX Vogtle Electric Generating Plant (VEGP) Units 3 and 4 Supplement to Proposed Changes to Licensing Basis Documents (LAR-20-004S1)
Insertions Denoted by Blue Underline and Deletions by Red Strikethrough Omitted text is identified by three asterisks ( * * * )
(This Enclosure consists of 2 pages, including this cover page)
DRAFT rating Plant (VEGP) Units 3 and 4 P) Units ent to ent to Proposed Changes to Licensing B Proposed Changes to (LAR-20 20-004S1 00
)
sertions Denoted by rtions Denoted by Blue Blue Underline and Underline and R
Omitted text is Omitted text is identified by identified by
ND-20-XXXX Supplement to Proposed Changes to Licensing Basis Documents (LAR-20-004S1)
Page 2 of 2 Revise UFSAR Subsection 6.3.2.2.1, Core Makeup Tanks, as shown below:
[* * *]
Core makeup tank level and inlet and outlet line temperatures are monitored by indicators and alarms. The operator can take action as required to meet the technical specification requirements for core makeup tank operability. Core makeup tank temperature is monitored and trended to investigate potential leaks prior to alarm setpoints.
DRAFT red by indicators a red by i ecification requirements ecification monitored and trended to monitored and T