ML15286A184
| ML15286A184 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 10/13/2015 |
| From: | John Klos Plant Licensing Branch IV |
| To: | Elwood T AmerenUE |
| References | |
| Download: ML15286A184 (3) | |
Text
1 NRR-PMDAPEm Resource From:
Klos, John Sent:
Tuesday, October 13, 2015 11:04 AM To:
'Telwood@ameren.com' Cc:
Klos, John; 'SMaglio@ameren.com'; Krepel, Scott
Subject:
Request for Additional Information: Callaway Amendment Revision of TS 2.1.1.1 and 5.6.5 DNBR Safety Limit Importance:
High Mr. Elwood, By letter dated May, 8, 2015, Agencywide Documents and Access and Management System (ADAMS)
Accession Number ML15132A137 Ameren Missouri submitted a license amendment request for Callaway Unit 1 to change Technical Specification (TS) 2.1.1.1 and 5.6.5 to adopt NRC-approved Westinghouse Electric Company LLC topical report WCAP-14565-P-A, Addendum 2-P-A.
The Nuclear Regulatory Commission staff has reviewed the submittal and determined that a request for additional information (RAI) is needed to complete its review. The draft question was sent via electronic transmission on October 6, 2015 but no clarification call was requested by the licensee. The following RAI is now submitted to licensee and a response is requested in 30 days from the date of this email by Thursday November 12, 2015. The RAI is as follows; 10 CFR 50.36(c) requires licensees to include safety limits in the TS, defined as limits upon important process variables that are found to be necessary to reasonably protect the integrity of certain of the physical barriers that guard against the uncontrolled release of radioactivity. The Departure from Nucleate Boiling Ration (DNBR) limit is one such safety limit, since it protects the integrity of the fuel cladding.
The proposed change to TS 2.1.1.1 would only specify the 95/95 DNBR limit associated with the WRB-2 correlation.
However, the license amendment request is requesting approval of two additional alternative DNB correlations, each of which has its own unique DNBR limit.
Please explain why the DNBR limits associated with the ABB-NV and Westinghouse Low Pressure Departure from Nucleate Boiling correlations are not being included in TS 2.1.1.1.
If you have any questions, please contact John Klos per the contact information below.
John Klos DORL Callaway Project Manager U.S. NRC, Office of Nuclear Reactor Regulation, Division of Operating Reactor Licensing NRC/NRR/DORL/LPL4-1, O8H4, Washington, DC 20555-0001
2 301.415.5136, 301.415.3313 (fax)
MS O8H4, John.Klos@NRC.gov
Hearing Identifier:
NRR_PMDA Email Number:
2448 Mail Envelope Properties (98337a27b37a43c9859ef830c1a3e278)
Subject:
Request for Additional Information: Callaway Amendment Revision of TS 2.1.1.1 and 5.6.5 DNBR Safety Limit Sent Date:
10/13/2015 11:03:59 AM Received Date:
10/13/2015 11:04:04 AM From:
Klos, John Created By:
John.Klos@nrc.gov Recipients:
"Klos, John" <John.Klos@nrc.gov>
Tracking Status: None
"'SMaglio@ameren.com'" <SMaglio@ameren.com>
Tracking Status: None "Krepel, Scott" <Scott.Krepel@nrc.gov>
Tracking Status: None
"'Telwood@ameren.com'" <Telwood@ameren.com>
Tracking Status: None Post Office:
HQPWMSMRS02.nrc.gov Files Size Date & Time MESSAGE 2129 10/13/2015 11:04:04 AM Options Priority:
High Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
1 NRR-PMDAPEm Resource From:
Klos, John Sent:
Tuesday, October 13, 2015 11:04 AM To:
'Telwood@ameren.com' Cc:
Klos, John; 'SMaglio@ameren.com'; Krepel, Scott
Subject:
Request for Additional Information: Callaway Amendment Revision of TS 2.1.1.1 and 5.6.5 DNBR Safety Limit Importance:
High Mr. Elwood, By letter dated May, 8, 2015, Agencywide Documents and Access and Management System (ADAMS)
Accession Number ML15132A137 Ameren Missouri submitted a license amendment request for Callaway Unit 1 to change Technical Specification (TS) 2.1.1.1 and 5.6.5 to adopt NRC-approved Westinghouse Electric Company LLC topical report WCAP-14565-P-A, Addendum 2-P-A.
The Nuclear Regulatory Commission staff has reviewed the submittal and determined that a request for additional information (RAI) is needed to complete its review. The draft question was sent via electronic transmission on October 6, 2015 but no clarification call was requested by the licensee. The following RAI is now submitted to licensee and a response is requested in 30 days from the date of this email by Thursday November 12, 2015. The RAI is as follows; 10 CFR 50.36(c) requires licensees to include safety limits in the TS, defined as limits upon important process variables that are found to be necessary to reasonably protect the integrity of certain of the physical barriers that guard against the uncontrolled release of radioactivity. The Departure from Nucleate Boiling Ration (DNBR) limit is one such safety limit, since it protects the integrity of the fuel cladding.
The proposed change to TS 2.1.1.1 would only specify the 95/95 DNBR limit associated with the WRB-2 correlation.
However, the license amendment request is requesting approval of two additional alternative DNB correlations, each of which has its own unique DNBR limit.
Please explain why the DNBR limits associated with the ABB-NV and Westinghouse Low Pressure Departure from Nucleate Boiling correlations are not being included in TS 2.1.1.1.
If you have any questions, please contact John Klos per the contact information below.
John Klos DORL Callaway Project Manager U.S. NRC, Office of Nuclear Reactor Regulation, Division of Operating Reactor Licensing NRC/NRR/DORL/LPL4-1, O8H4, Washington, DC 20555-0001
2 301.415.5136, 301.415.3313 (fax)
MS O8H4, John.Klos@NRC.gov
Hearing Identifier:
NRR_PMDA Email Number:
2448 Mail Envelope Properties (98337a27b37a43c9859ef830c1a3e278)
Subject:
Request for Additional Information: Callaway Amendment Revision of TS 2.1.1.1 and 5.6.5 DNBR Safety Limit Sent Date:
10/13/2015 11:03:59 AM Received Date:
10/13/2015 11:04:04 AM From:
Klos, John Created By:
John.Klos@nrc.gov Recipients:
"Klos, John" <John.Klos@nrc.gov>
Tracking Status: None
"'SMaglio@ameren.com'" <SMaglio@ameren.com>
Tracking Status: None "Krepel, Scott" <Scott.Krepel@nrc.gov>
Tracking Status: None
"'Telwood@ameren.com'" <Telwood@ameren.com>
Tracking Status: None Post Office:
HQPWMSMRS02.nrc.gov Files Size Date & Time MESSAGE 2129 10/13/2015 11:04:04 AM Options Priority:
High Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received: