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| issue date = 04/14/2010
| issue date = 04/14/2010
| title = Follow-Up Questions - EPU Vessels and Integrity Review
| title = Follow-Up Questions - EPU Vessels and Integrity Review
| author name = Guzman R V
| author name = Guzman R
| author affiliation = NRC/NRR/DORL
| author affiliation = NRC/NRR/DORL
| addressee name = Darling T H
| addressee name = Darling T
| addressee affiliation = Constellation Energy Nuclear Group, LLC
| addressee affiliation = Constellation Energy Nuclear Group, LLC
| docket = 05000410
| docket = 05000410
| license number = NPF-069
| license number = NPF-069
| contact person = Guzman R V, NRR/DORL, 415-1030
| contact person = Guzman R, NRR/DORL, 415-1030
| case reference number = TAC ME1476
| case reference number = TAC ME1476
| document type = E-Mail
| document type = E-Mail
Line 18: Line 18:


=Text=
=Text=
{{#Wiki_filter:From:Guzman, RichardSent:Wednesday, April 14, 2010 2:05 PM To:Darling, Theresa H Cc:Dosa, John J
{{#Wiki_filter:From: Guzman, Richard Sent: Wednesday, April 14, 2010 2:05 PM To:
Darling, Theresa H Cc:
Dosa, John J


==Subject:==
==Subject:==
Follow-up Question - EPU Vessels & Internals Integrity
Follow-up Question - EPU Vessels & Internals Integrity
: Theresa, We'd like to discuss the two items below in support of completing the safety evaluation in the  
: Theresa, We'd like to discuss the two items below in support of completing the safety evaluation in the Vessels & Internals Integrity review area:
 
: 1. NMPNS stated in its RAI Response dated February 19, 2010, Attachment 5, RAI Response G1, that they consider their commitment to maintain a RG 1.190 fluence program as adequate.
Vessels & Internals Integrity review area:
The NRC staff considers it appropriate for the licensee to commit to submit a revised relief request for elimination of the circumferential reactor vessel weld inspection a full year before the currently approved fluence is reached.
: 1. NMPNS stated in its RAI Response dated February 19, 2010, Attachment 5, RAI Response  
: 2. The NRC staff notes that the current P-T limits in the Technical Specifications, good up to 22 EFPY (approved in Amendment #240 by the NRC on Jan. 27, 2004), is based on a projected neutron fluence at the 1/4 T location on the limiting baseline material of 3.77E17 neutrons per square centimeter (n/cm2) for neutrons with > 1MeV energy. The proposed EPU will increase the neutron flux and the projected fluence level, and therefore, the staff anticipates that the limiting fluence for which the P-T limits are based upon will be reached before 22 EFPY. The staff requests the licensee to provide the revised EFPY value when the 3.77E17 n/cm2 neutron fluence will be reached at the 1/4 T location on the limiting baseline material with the assumption that proposed EPU is approved and implemented on schedule. If the new value invalidates the period of applicability (in EFPY) of the current TS figure, an updated TS page should be submitted which correctly expresses the period of applicability post-EPU.
 
Anytime Tues - Thurs next week works for us.
G1, that they consider their commitment to maintain a RG 1.190 fluence  
: Thanks, Rich Guzman 301-415-1030 E-mail Properties Mail Envelope Properties (92E0E77F3622DA40B501E8D45083D5D9508499C81C)
 
program as adequate.
 
The NRC staff considers it appropriate for the licensee to commit to  
 
submit a revised relief  
 
request for elimination of the circumferential reactor vessel weld  
 
inspection a full year before the  
 
currently approved fluence is reached.
: 2. The NRC staff notes that the current P-T limits in the Technical Specifications, good up to 22  
 
EFPY (approved in Amendment #240 by the NRC on Jan. 27, 2004), is based  
 
on a projected  
 
neutron fluence at the 1/4 T location on the limiting baseline material  
 
of 3.77E17 neutrons per  
 
square centimeter (n/cm2) for neutrons with > 1MeV energy. The proposed
 
EPU will increase  
 
the neutron flux and the projected fluence level, and therefore, the  
 
staff anticipates that the  
 
limiting fluence for which the P-T limits are based upon will be reached
 
before 22 EFPY. The  
 
staff requests the licensee to provide the revised EFPY value when the  
 
3.77E17 n/cm2 neutron  
 
fluence will be reached at the 1/4 T location on the limiting baseline  
 
material with the assumption  
 
that proposed EPU is approved and implemented on schedule. If the new  
 
value invalidates the  
 
period of applicability (in EFPY) of the current TS figure, an updated  
 
TS page should be  
 
submitted which correctly expresses the period of applicability post-
 
EPU.Anytime Tues - Thurs next week works for us.
Thanks, Rich Guzman
 
301-415-1030 E-mail Properties Mail Envelope Properties (92E0E77F3622DA40B501E8D45083D5D9508499C81C)  


==Subject:==
==Subject:==
Follow-up Question - EPU Vessels & Internals IntegritySent Date:4/14/2010 2:04:41 PM Received Date:4/14/2010 2:04:00 PM From:Guzman, RichardCreated By: Richard.Guzman@nrc.gov
Follow-up Question - EPU Vessels & Internals Integrity Sent Date:
 
4/14/2010 2:04:41 PM Received Date:
Recipients:
4/14/2010 2:04:00 PM From:
Guzman, Richard Created By:
Richard.Guzman@nrc.gov Recipients:
Theresa.Darling@cengllc.com (Darling, Theresa H)
Theresa.Darling@cengllc.com (Darling, Theresa H)
Tracking Status: None John.Dosa@cengllc.com (Dosa, John J)
Tracking Status: None John.Dosa@cengllc.com (Dosa, John J)
Tracking Status: None Post Office:
Tracking Status: None Post Office:
HQCLSTR01.nrc.govFilesSizeDate & TimeMESSAGE43414/14/2010 Options Expiration Date:
HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 4341 4/14/2010 Options Expiration Date:
Priority:olImportanceNormal ReplyRequested:False Return Notification:False Sensitivity: olNormal Recipients received:}}
Priority:
olImportanceNormal ReplyRequested:
False Return Notification:
False Sensitivity:
olNormal Recipients received:}}

Latest revision as of 05:05, 14 January 2025

Follow-Up Questions - EPU Vessels and Integrity Review
ML101300006
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 04/14/2010
From: Richard Guzman
Division of Operating Reactor Licensing
To: Darling T
Constellation Energy Nuclear Group
Guzman R, NRR/DORL, 415-1030
References
TAC ME1476
Download: ML101300006 (1)
v • d • e


Text

From: Guzman, Richard Sent: Wednesday, April 14, 2010 2:05 PM To:

Darling, Theresa H Cc:

Dosa, John J

Subject:

Follow-up Question - EPU Vessels & Internals Integrity

Theresa, We'd like to discuss the two items below in support of completing the safety evaluation in the Vessels & Internals Integrity review area:
1. NMPNS stated in its RAI Response dated February 19, 2010, Attachment 5, RAI Response G1, that they consider their commitment to maintain a RG 1.190 fluence program as adequate.

The NRC staff considers it appropriate for the licensee to commit to submit a revised relief request for elimination of the circumferential reactor vessel weld inspection a full year before the currently approved fluence is reached.

2. The NRC staff notes that the current P-T limits in the Technical Specifications, good up to 22 EFPY (approved in Amendment #240 by the NRC on Jan. 27, 2004), is based on a projected neutron fluence at the 1/4 T location on the limiting baseline material of 3.77E17 neutrons per square centimeter (n/cm2) for neutrons with > 1MeV energy. The proposed EPU will increase the neutron flux and the projected fluence level, and therefore, the staff anticipates that the limiting fluence for which the P-T limits are based upon will be reached before 22 EFPY. The staff requests the licensee to provide the revised EFPY value when the 3.77E17 n/cm2 neutron fluence will be reached at the 1/4 T location on the limiting baseline material with the assumption that proposed EPU is approved and implemented on schedule. If the new value invalidates the period of applicability (in EFPY) of the current TS figure, an updated TS page should be submitted which correctly expresses the period of applicability post-EPU.

Anytime Tues - Thurs next week works for us.

Thanks, Rich Guzman 301-415-1030 E-mail Properties Mail Envelope Properties (92E0E77F3622DA40B501E8D45083D5D9508499C81C)

Subject:

Follow-up Question - EPU Vessels & Internals Integrity Sent Date:

4/14/2010 2:04:41 PM Received Date:

4/14/2010 2:04:00 PM From:

Guzman, Richard Created By:

Richard.Guzman@nrc.gov Recipients:

Theresa.Darling@cengllc.com (Darling, Theresa H)

Tracking Status: None John.Dosa@cengllc.com (Dosa, John J)

Tracking Status: None Post Office:

HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 4341 4/14/2010 Options Expiration Date:

Priority:

olImportanceNormal ReplyRequested:

False Return Notification:

False Sensitivity:

olNormal Recipients received:

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