ML11179A025: Difference between revisions
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| issue date = 06/23/2011 | | issue date = 06/23/2011 | ||
| title = Request for Additional Information Regarding Relief Request RR-04-11, Implementation of a Risk-Informed Inservice Inspection Program Based on ASME Code Case N-716 for the Fourth 10-Year Inspection Interval | | title = Request for Additional Information Regarding Relief Request RR-04-11, Implementation of a Risk-Informed Inservice Inspection Program Based on ASME Code Case N-716 for the Fourth 10-Year Inspection Interval | ||
| author name = Price J | | author name = Price J | ||
| author affiliation = Dominion, Dominion Nuclear Connecticut, Inc | | author affiliation = Dominion, Dominion Nuclear Connecticut, Inc | ||
| addressee name = | | addressee name = | ||
| Line 14: | Line 14: | ||
| page count = 4 | | page count = 4 | ||
| project = TAC:ME5962 | | project = TAC:ME5962 | ||
| stage = | | stage = Request | ||
}} | }} | ||
=Text= | =Text= | ||
{{#Wiki_filter: | {{#Wiki_filter:Dominion Nuclear Connecticut, Inc. | ||
Document Control Desk Washington, DC 20555 | 5000 Dominion Boulevard, Glen Allen, Virginia 23060 Ž#ODominion Web Address: www.dom.com June 23, 2011 U. S. Nuclear Regulatory Commission Serial No. 11-347 Attention: Document Control Desk NSSL/WDC RO Washington, DC 20555 Docket No. 50-336 License No. DPR-65 DOMINION NUCLEAR CONNECTICUT. INC. | ||
INC.MILLSTONE POWER STATION UNIT 2 REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 FOR THE FOURTH 10-YEAR INSPECTION INTERVAL (TAC NO. ME5962)Dominion Nuclear Connecticut, Inc. (DNC) submitted Relief Request RR-04-11 for Millstone Power Station Unit 2 (MPS2) in a letter dated March 30, 2011. DNC requested authorization to implement a risk-informed inservice inspection (ISI)program based on American Society of Mechanical Engineers (ASME) Code Case N-716 for the fourth 10-year ISI interval. | MILLSTONE POWER STATION UNIT 2 REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 FOR THE FOURTH 10-YEAR INSPECTION INTERVAL (TAC NO. ME5962) | ||
In a letter dated June 14, 2011, the NRC transmitted a request for additional information (RAI) related to Relief Request RR-04-1 1. DNC agreed to respond to the RAI by July 8, 2011.Attachment 1 provides DNC's response to the NRC RAI.If you have any questions regarding this submittal, please contact Wanda Craft at (804) 273-4687.Sincerely, J.Vi,ýident -Nuclear Engineering 0(4 -7 Serial No. 11-347 Docket No. 50-336 RAI Response for RR-04-11 Page 2 of 2 | Dominion Nuclear Connecticut, Inc. (DNC) submitted Relief Request RR-04-11 for Millstone Power Station Unit 2 (MPS2) in a letter dated March 30, 2011. DNC requested authorization to implement a risk-informed inservice inspection (ISI) program based on American Society of Mechanical Engineers (ASME) Code Case N-716 for the fourth 10-year ISI interval. In a letter dated June 14, 2011, the NRC transmitted a request for additional information (RAI) related to Relief Request RR-04-1 1. DNC agreed to respond to the RAI by July 8, 2011. | ||
Attachment 1 provides DNC's response to the NRC RAI. | |||
If you have any questions regarding this submittal, please contact Wanda Craft at (804) 273-4687. | |||
Sincerely, J. | |||
Vi, ýident - Nuclear Engineering 0(4 -7 | |||
Serial No. 11-347 Docket No. 50-336 RAI Response for RR-04-11 Page 2 of 2 | |||
==Attachment:== | ==Attachment:== | ||
: 1. Response to Request for Additional Information Regarding Relief Request RR-04-1 1, Implementation of a Risk-Informed Inservice Inspection Program Based on ASME Code Case N-716 Commitments made in this letter: 1. None cc: U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 C. J. Sanders Project Manager -Millstone Power Station U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08-B3 Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station Serial No. 11-347 Docket No. 50-336 ATTACHMENT 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 DOMINION NUCLEAR CONNECTICUT, INC.MILLSTONE POWER STATION UNIT 2 Serial No. 11-347 Docket No. 50-336 RAI Response for RR-04-1 1 Attachment 1, Page 1 of 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 Dominion Nuclear Connecticut, Inc. (DNC) submitted Relief Request RR-04-11 for Millstone Power Station Unit 2 (MPS2) in a letter dated March 30, 2011. DNC requested authorization to implement a risk-informed inservice inspection (ISI) program based on American Society of Mechanical Engineers (ASME) Code Case N-716 for the fourth 10-year ISI interval. | : 1. Response to Request for Additional Information Regarding Relief Request RR-04-1 1, Implementation of a Risk-Informed Inservice Inspection Program Based on ASME Code Case N-716 Commitments made in this letter: | ||
In a letter dated June 14, 2011, the NRC transmitted a request for additional information (RAI) related to Relief Request RR-04-1 1. This attachment provides DNC's response to the NRC RAI.Question | : 1. None cc: U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 C. J. Sanders Project Manager - Millstone Power Station U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08-B3 Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station | ||
Quality Gap Analysis: MPS2," of the licensee's March 30, 2011, submittal indicates that multi-unit flood areas and scenarios were not modeled for the MPS2 internal flooding PRA (item IFPP-A3).Please provide an explanation for why multi-unit flood areas and scenarios are not relevant for MPS2, and discuss implications to the ISI program risk assessment for any shared systems not modeled in the flooding PRA.DNC Response Multi-unit flood areas and scenarios are not relevant for MPS2 because MPS2 and MPS3 are physically separated and do not share any buildings pertinent to the internal flooding PRA. The only fluid systems that connect Units 2 and 3 are the instrument air crosstie, which has no implications associated with flooding, and the condensate polishing system, which has insufficient capacity to affect either unit in a flooding scenario. | |||
There are no multi-unit flooding scenarios that have implications to the ISI program risk assessment.}} | Serial No. 11-347 Docket No. 50-336 ATTACHMENT 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 DOMINION NUCLEAR CONNECTICUT, INC. | ||
MILLSTONE POWER STATION UNIT 2 | |||
Serial No. 11-347 Docket No. 50-336 RAI Response for RR-04-1 1 Attachment 1, Page 1 of 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 Dominion Nuclear Connecticut, Inc. (DNC) submitted Relief Request RR-04-11 for Millstone Power Station Unit 2 (MPS2) in a letter dated March 30, 2011. DNC requested authorization to implement a risk-informed inservice inspection (ISI) program based on American Society of Mechanical Engineers (ASME) Code Case N-716 for the fourth 10-year ISI interval. In a letter dated June 14, 2011, the NRC transmitted a request for additional information (RAI) related to Relief Request RR-04-1 1. This attachment provides DNC's response to the NRC RAI. | |||
Question 1 , Table 1.1, "PRA [probabilistic risk assessment] Quality Gap Analysis: | |||
MPS2," of the licensee's March 30, 2011, submittal indicates that multi-unit flood areas and scenarios were not modeled for the MPS2 internal flooding PRA (item IFPP-A3). | |||
Please provide an explanation for why multi-unit flood areas and scenarios are not relevant for MPS2, and discuss implications to the ISI program risk assessment for any shared systems not modeled in the flooding PRA. | |||
DNC Response Multi-unit flood areas and scenarios are not relevant for MPS2 because MPS2 and MPS3 are physically separated and do not share any buildings pertinent to the internal flooding PRA. The only fluid systems that connect Units 2 and 3 are the instrument air crosstie, which has no implications associated with flooding, and the condensate polishing system, which has insufficient capacity to affect either unit in a flooding scenario. There are no multi-unit flooding scenarios that have implications to the ISI program risk assessment.}} | |||
Latest revision as of 19:05, 12 November 2019
| ML11179A025 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/23/2011 |
| From: | Price J Dominion, Dominion Nuclear Connecticut |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 11-347, RR-04-11, TAC ME5962 | |
| Download: ML11179A025 (4) | |
Text
Dominion Nuclear Connecticut, Inc.
5000 Dominion Boulevard, Glen Allen, Virginia 23060 Ž#ODominion Web Address: www.dom.com June 23, 2011 U. S. Nuclear Regulatory Commission Serial No.11-347 Attention: Document Control Desk NSSL/WDC RO Washington, DC 20555 Docket No. 50-336 License No. DPR-65 DOMINION NUCLEAR CONNECTICUT. INC.
MILLSTONE POWER STATION UNIT 2 REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 FOR THE FOURTH 10-YEAR INSPECTION INTERVAL (TAC NO. ME5962)
Dominion Nuclear Connecticut, Inc. (DNC) submitted Relief Request RR-04-11 for Millstone Power Station Unit 2 (MPS2) in a letter dated March 30, 2011. DNC requested authorization to implement a risk-informed inservice inspection (ISI) program based on American Society of Mechanical Engineers (ASME) Code Case N-716 for the fourth 10-year ISI interval. In a letter dated June 14, 2011, the NRC transmitted a request for additional information (RAI) related to Relief Request RR-04-1 1. DNC agreed to respond to the RAI by July 8, 2011.
Attachment 1 provides DNC's response to the NRC RAI.
If you have any questions regarding this submittal, please contact Wanda Craft at (804) 273-4687.
Sincerely, J.
Vi, ýident - Nuclear Engineering 0(4 -7
Serial No.11-347 Docket No. 50-336 RAI Response for RR-04-11 Page 2 of 2
Attachment:
- 1. Response to Request for Additional Information Regarding Relief Request RR-04-1 1, Implementation of a Risk-Informed Inservice Inspection Program Based on ASME Code Case N-716 Commitments made in this letter:
- 1. None cc: U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1415 C. J. Sanders Project Manager - Millstone Power Station U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 08-B3 Rockville, MD 20852-2738 NRC Senior Resident Inspector Millstone Power Station
Serial No.11-347 Docket No. 50-336 ATTACHMENT 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 DOMINION NUCLEAR CONNECTICUT, INC.
MILLSTONE POWER STATION UNIT 2
Serial No.11-347 Docket No. 50-336 RAI Response for RR-04-1 1 Attachment 1, Page 1 of 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST RR-04-11, IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM BASED ON ASME CODE CASE N-716 Dominion Nuclear Connecticut, Inc. (DNC) submitted Relief Request RR-04-11 for Millstone Power Station Unit 2 (MPS2) in a letter dated March 30, 2011. DNC requested authorization to implement a risk-informed inservice inspection (ISI) program based on American Society of Mechanical Engineers (ASME) Code Case N-716 for the fourth 10-year ISI interval. In a letter dated June 14, 2011, the NRC transmitted a request for additional information (RAI) related to Relief Request RR-04-1 1. This attachment provides DNC's response to the NRC RAI.
Question 1 , Table 1.1, "PRA [probabilistic risk assessment] Quality Gap Analysis:
MPS2," of the licensee's March 30, 2011, submittal indicates that multi-unit flood areas and scenarios were not modeled for the MPS2 internal flooding PRA (item IFPP-A3).
Please provide an explanation for why multi-unit flood areas and scenarios are not relevant for MPS2, and discuss implications to the ISI program risk assessment for any shared systems not modeled in the flooding PRA.
DNC Response Multi-unit flood areas and scenarios are not relevant for MPS2 because MPS2 and MPS3 are physically separated and do not share any buildings pertinent to the internal flooding PRA. The only fluid systems that connect Units 2 and 3 are the instrument air crosstie, which has no implications associated with flooding, and the condensate polishing system, which has insufficient capacity to affect either unit in a flooding scenario. There are no multi-unit flooding scenarios that have implications to the ISI program risk assessment.