ML20203M225

COL Docs - Draft Supplement for Cmt Boron Concentration LAR

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

Hearing Identifier: Vogtle_COL_Docs_Public Email Number: 580 Mail Envelope Properties (BL0PR0901MB2994C4C58E9E6DD9045F783496780)

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>

Tracking Status: None Post Office: 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: Normal Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Southern Nuclear Operating Company ND-20-XXXX T

Enclosure 4 RAF Vogtle Electric Generating Core Supplement rating Plant (VEGP) lement to Request P) Units 3 and 4 Amendment:

uest for License Amendme Concentration Requirements e Makeup Tank Boron Conce (LAR-20-004S1)

(LAR-20 20--004S1 00 )

Re D

(This Enclosure consists of 2 pages, including this cover page)

ND-20-XXXX Supplement to Request for License Amendment: Core Makeup Tank Boron Concentration Requirements (LAR-20-004S1)

During the NRCs audit (ML20133K106) of the technical information supporting LAR-20-004, R -2 the need for clarifications was identified for the submittal based on the procedural information nformat nformatio which supports the request. The monitoring and trending of the CMT temperature rresponse to e and respon unexpected changes of temperature is described and clarified in the technicalhnical evaluation e and a

licensing basis markups provided in this supplement. This supplement does oes not impact imp the scope or conclusions of the Technical Evaluation, Significant Hazards Consideration ideration Determination, Determ or Environmental Considerations of the original submittal.

Page 9 of 17 of ND-20-0507 Enclosure 1 states Therefore, the e CMT top high temperature alaalarm identify if the CMT boron concentration remains within assumptions are met regarding CMT temperature.

T can indicate to the operators that there may be in-leakage and to initiate by procedure steps responses to a high temperature alarm, it is also consistent trend the CMT top temperature and respond to an abnormalnorma temperature bnormal ature. This steps to in the required limits. In addition on to sistent with site procedures to monitor and ure rise before reaching the temperature alarm setpoint. Data is recorded at least daily for SR 3.5.2.1 to confirm tha is data can also als be used to det in determine th that safety analysis initial R

whether Reactor Coolant System (RCS) water ter is entering a CMT. The Th capability is also provided to monitor and trend this data in real time using the plant computer.

Consistent with the results of the analysis ysis of a temperature rise in the CMT, nalysis CM increases in 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 po potential leak and are pot investigated to determine the cause of the he temperature rise. Potential ca causes such as rise in AF containment temperature are considered d and other indicators in thet CMT (such as the temperature trend of otherr sensors in the CMT)

MT) are reviewed.

revie UFSAR Subsection 6.3.2.2.1 is revised to include la which reflects this practice as part of language whic this supplement (see ee Enclosure 5 which supplement Enclosure 2 from ND-20-0507).

supplements Enclosu D

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Southern Nuclear Operating Company ND-20-XXXX T

Enclosure 5 RAF Vogtle Electric Generating Supplement Insertions rating Plant (VEGP)

(LAR-20-004S1)

(LAR-20 20--004S1 00 )

P) Units 3 and 4 ent to Proposed Changes to Licensing B Basis Documents rtions Denoted by Blue Underline and Deletions by Red Strikethrough sertions Omitted text is identified by three asterisks ( * * * )

D (This Enclosure consists of 2 pages, including this cover page)

ND-20-XXXX Supplement to Proposed Changes to Licensing Basis Documents (LAR-20-004S1)

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 monitoredred by iindicators and a

alarms. The operator can take action as required to meet the technical specification ecification requirements for core makeup tank operability. Core makeup tank temperature is monitored and trended to investigate potential leaks prior to alarm setpoints.

T RAF D

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