ML15198A343
| ML15198A343 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/22/2015 |
| From: | Craft W Dominion, Dominion Nuclear Connecticut |
| To: | Richard Guzman Plant Licensing Branch 1 |
| Guzman R | |
| References | |
| Download: ML15198A343 (14) | |
Text
P S b itt l T l f
Pre-Submittal Teleconference for LOCA Analyses Supporting Millstone Power Station, Unit 2 Upgrade to AREVA Standard CE14 pg HTP Fuel Assembly June 22, 2015 Ju e
, 0 5
Agenda 1)
Background on fuel product upgrade at Millstone Power Station Unit 2 (MPS2) 2)
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d 2)
Licensing overview for fuel product upgrade 3)
License Amendments for LOCA Analyses
- Small Break Loss of Coolant Accident (SBLOCA)
- Small Break Loss of Coolant Accident (SBLOCA)
- Large Break Loss of Coolant Accident (LBLOCA) 4)
Licensing timeline/schedule
)
ce s g t e
e/sc edu e 5)
Future Dominion/NRC interactions Pg. 2
Background on Fuel Product Upgrade
- Kickoff meeting with NRC was July 17, 2013 (ADAMS ML13207A259)
- Goal is to implement the change for Cycle 25 (Spring 2017)
- Upgrade fuel product is called the AREVA Standard CE14 pg p
HTP Fuel Assembly
- Upgrades to the current MPS2 fuel product:
pg p
- M5 cladding
- Advanced fuel rod geometry
- Zircaloy-4 MONOBLOC'guide tubes Pg. 3 Zircaloy 4 MONOBLOC guide tubes
Licensing Overview
- Dominion identified 2 required submittals:
Dominion identified 2 required submittals:
- M5 LAR and Exemption Request
- Exemption Request approved on May 12, 2015
- Amendment approved on May 18, 2015
- LAR to add RLBLOCA topical report to MPS2 TS 6.9.1.8 (list of analytical methods used to determine COLR limits)
- Statement made to NRC in a Dominion letter dated Statement made to NRC in a Dominion letter dated November 1, 2012 regarding SBLOCA:
- A reanalysis of the SBLOCA event will be submitted within one year of NRC approval of Supplement 1 to the AREVA SBLOCA methodology NRC approval of Supplement 1 to the AREVA SBLOCA methodology
- NRC reiterated in Sleicher-Rouse Closure Evaluation dated July 18, 2013
SBLOCA Analysis
- Analysis completed using EMF-2328(P)(A) including
- Analysis completed using EMF-2328(P)(A) including Supplement 1 Analysis conforms to draft NRC safety evaluation
- Analysis conforms to draft NRC safety evaluation
- Change to TS 6.9.1.8 will add Supplement 1 to Reference 5
- LAR will omit revision number and vendor names to avoid confusion
- Dominion plans to submit LAR in July 2015 (more schedule discussion later)
- Dominion seeks NRC feedback on referencing the draft SE Pg. 5
SBLOCA Analysis Analysis of Record (AOR) presented in the LAR was performed for fuel product with M5 cladding
- Assessment performed for full core of the fuel product with Zr-4 cladding to develop PCT for comparison to the AOR (fuel product with M5 cladding)
- PCT difference will be maintained as a 10 CFR 50.46 estimate until fuel product p
with Zr-4 cladding is non-limiting
- Addressing the fuel product with Zr-4 cladding explicitly supports implementation of the LAR with SBLOCA EM Supplement 1 soon after NRC approval o t e w t S OC Supp e e t soo a te N C app ova
- No need to wait for fuel product with M5 cladding introduction in 2017
- Dominion prefers this approach as the AOR represents the M5 clad fuel fi ti th t ill b d f li ith 50 46 configuration that will be used for compliance with 50.46c
- Dominion seeks NRC feedback on this approach Pg. 6
SBLOCA Analysis
- RODEX used to develop fuel rod inputs for SBLOCA analysis
- Change to TS 6.9.1.8 will add Supplement 1 to Reference 16 g
pp
- LAR will remove the revision number and omit vendor names to avoid confusion Pg. 7
LBLOCA Analysis Analysis completed using EMF-2103(P) Revision 3 Analysis completed using EMF 2103(P) Revision 3
- Analysis is in progress and is being performed in accordance with the submitted EM as modified by the AREVA RAI responses
- AREVA engineering products for MPS2 will be completed after affirmation from NRC that RAI responses from January 2015 are acceptable A
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- LAR will be submitted after review of the draft NRC SE to ensure conformance
- Analysis does not apply to the fuel product with Zr-4 cladding. Implementation of the LAR will be requested for the Spring 2017 refueling outage with first use of the the LAR will be requested for the Spring 2017 refueling outage with first use of the fuel product with M5 cladding
- Fuel product with Zr-4 cladding will be addressed for mixed cores Fuel product with Zr-4 cladding will be addressed for mixed cores
- Dominion seeks NRC feedback on referencing the draft SE in the LAR Pg. 8
Licensing timeline/schedule Need LOCA Analysis LARs approved by October 2016 Supports M5 Cladding for Cycle 25 (Spring 2017)
SBLOCA schedule has delayed 10 months from the initial project schedule presented in July 2013 l
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- Planned submittal date still allows for 12 month NRC review of the LAR LBLOCA schedule has delayed at least 6 months from the initial project schedule presented in July 2013 project schedule presented in July 2013
- Planned submittal date still allows for 12 month NRC review of the LAR with minimal schedule float Pg. 9
SBLOCA Licensing timeline/schedule Pg. 10
LBLOCA Licensing timeline/schedule Pg. 11
Future Dominion/NRC Interactions
- Implementation of the fuel product upgrade at MPS2 for Cycle 25 in Spring 2017 relies on the schedule presented
- LAR with LBLOCA analysis to be submitted in September 2015 with reference to draft SE September 2015 with reference to draft SE
- Schedule depends on NRC agreement with AREVA RAI responses
- Potential re-work of AREVA engineering products for MPS2 Pg. 12
Discussion Pg. 13
Acronym List AOR Analysis of Record AOR Analysis of Record CFR Code of Federal Regulations COLR Core Operating Limits Report EM Evaluation Model EM Evaluation Model HTP High Thermal Performance LAR License Amendment Request LBLOCA Large Break Loss of Coolant Accident LBLOCA Large Break Loss of Coolant Accident LOCA Loss of Coolant Accident MPS2 Millstone Power Station, Unit 2 RAI Request for Additional Information RAI Request for Additional Information RLBLOCA Realistic Large Break Loss of Coolant Accident SBLOCA Small Break Loss of Coolant Accident SE Safety Evaluation SE Safety Evaluation TS Technical Specifications Pg. 14