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| {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. S. K. Gambhir , Vice President , Techn i cal Services Columbia Generat i ng Station Energy Northwest MD PE04 P. O. Box 968 Rich l and, WA 99352 November 10 , 2010 | | {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 November 10, 2010 Mr. S. K. Gambhir, Vice President, Technical Services Columbia Generating Station Energy Northwest MD PE04 P. O. Box 968 Richland, WA 99352 |
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| ==SUBJECT:== | | ==SUBJECT:== |
| REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION | | REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION - |
| -SAMA REVIEW (TAC NO. ME3121)
| | SAMA REVIEW (TAC NO. ME3121) |
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| ==Dear Mr. Gambhir:== | | ==Dear Mr. Gambhir:== |
| By letter dated January 19, 2010, Energy Northwest submitted an application to the U.S. Nuclear Regulatory Commission (NRC) to renew operating license NPF-21 for Columb i a Generating Station pursuant to Title 10 of the Code of Federal Regulations Part 54. T h e NRC staff is r eviewing the information contained in the license renewal application and the associated Environmenta l Report. The staff has identified, in the enclosure , areas where add i t i onal i nformation i s needed to complete the Severe Accident Mitigation Alternatives (SAMA) review. Further requests for addit i onal information may be issued in the future. I tems i n the enclosure were d i scussed with Mr. Abbas Mostala. A mutually agreeable date for the response is within 60 days from the date of this letter. If you have any questions , please contact me at 301-415-3748 or bye-mail at daniel.doyle@ | | |
| nr c.gov. Docket No. 50-397
| | By letter dated January 19, 2010, Energy Northwest submitted an application to the U.S. |
| | Nuclear Regulatory Commission (NRC) to renew operating license NPF-21 for Columbia Generating Station pursuant to Title 10 of the Code of Federal Regulations Part 54. The NRC staff is reviewing the information contained in the license renewal application and the associated Environmental Report. The staff has identified, in the enclosure , areas where additional information is needed to complete the Severe Accident Mitigation Alternatives (SAMA) review. |
| | Further requests for additional information may be issued in the future . |
| | Items in the enclosure were discussed with Mr. Abbas Mostala. A mutually agreeable date for the response is within 60 days from the date of this letter. If you have any questions, please contact me at 301-415-3748 or bye-mail at daniel.doyle@nrc.gov. |
| | Sincerely, Daniel Doyle, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-397 |
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| ==Enclosure:== | | ==Enclosure:== |
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| As stated cc w/encl: Distr i but i on v i a Listserv Sincerely , Daniel Doyle, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Request for Additional Information Regarding the Analysis of Severe Accident Mitigation Alternatives for the Columbia Generating Station License Renewal Review | | As stated cc w/encl : Distribution via Listserv |
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| | Request for Additional Information Regarding the Analysis of Severe Accident Mitigation Alternatives for the Columbia Generating Station License Renewal Review |
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| ==Background:== | | ==Background:== |
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| The NRC issued a previous request for additional information (RAI) related to the Severe Accident Mitigation Analysis (SAMA) review to Energy Northwest by l etter dated July 1 , 2010 (ADAMS Accession Number ML101760421). | | The NRC issued a previous request for additional information (RAI) related to the Severe Accident Mitigation Analysis (SAMA) review to Energy Northwest by letter dated July 1, 2010 (ADAMS Accession Number ML101760421). Energy Northwest provided a partial response to the RAls by letter dated September 17, 2010 (ADAMS Accession Number ML102660151). |
| Ene r gy Northwest provided a partial r esponse to the RAls by letter dated September 17, 2010 (ADAMS Accession Number ML102660151).
| | The purpose of this request for additional information is to provide clarification on Energy Northwest's partial response (referred to in this document as "the response") dated September 17,2010. |
| The purpose of this request for additional information is to prov i de clarification on Energy Northwest's partial response (referred to in this document as "th e r esponse") dated September 17,2010. RAI 3.d(i)-1 The response states th at the " electronic database used to select and locate cables does not includ e all conduit location s," and that "m ost, but not all" of the multi p l e spurious equipment operations (MSOs) that may need to be modeled have been captured and that, for thos e not captured, the response to RAI 6.j will account for the incompleteness. | | RAI 3.d(i)-1 The response states that the "electronic database used to select and locate cables does not include all conduit locations," and that "most, but not all" of the multiple spurious equipment operations (MSOs) that may need to be modeled have been captured and that, for those not captured, the response to RAI 6.j will account for the incompleteness. The response continues to the conclusion that "model incompleteness is judged to be encompassed by the provided sensitivity analysis," which includes the use of a 95th percentile uncertainty band on the base fire core damage frequency (CDF). (The response to RAI 6.j further cites sensitivity analysis via the 95th percentile approach.) As Columbia estimates a fire CDF using an analysis that goes beyond the typical fire individual plant examination - external events (lPEEE), enhancements to reduce potential conservatisms, as well as enhancements to remove potential non-conservatisms, that might exist in an IPEEE-like estimate of fire CDF should be present. For example, source-target-specific fire scenarios should have been used in lieu of more conservative assumptions of total room burn-up; and hot short probabilities typically of at least 0.3 shou ld have been assumed in lieu of potentially non-conservative lower values. Please describe these enhancements, including those used with regard to compensating for any incompleteness in the cable location database and modeling of MSOs as cited in the response . . |
| The response continues to the conclusion that "model incompleteness is judged to be encompassed by the provided sensitiv ity analysis ," which includes the use of a 95th percentile uncertainty band on the base fir e core damage frequency (CDF). (The response to RAI 6.j further cites sens itivity analysis via th e 95th percentile approach.) As Columbia estimates a fire CDF using an analysis that goes beyond the typical fire individual plant examination | | ENCLOSURE |
| -external events (lPEEE), enhancements to r educe potential conservatisms, as well as enhancements to remove potential conservatisms, that might exist in an IPEEE-like estimate of fire CDF shou ld be present. For example, sou rce-target-specific fire scenarios should have been used in lieu of more conservative assumptions of total room burn-up; and hot short probabilities typically of at least 0.3 shou ld have been assumed in lieu of potentially non-conservative lower values. Please describe the se enhancements, including those used with regard to compensat ing for any incompl eteness in the cable lo cation database and modeling of MSOs as cited in the response .. ENCLOSURE RAI6.j-1 i. The uncertainty analysis presented in response to this RAI did not re-evaluate the Phase 1 SAMAs using the maximum uncertainty benefit (from eliminating all int erna l and external ri sk) from applying the uncertainty factors provided in Table 6.j-1. Specifically , the maximum baseline benefit in the ER is reported to be $1.9M , while applying the Tab l e 6.j-1 uncertainty factors would increase the maximum benefit to $5.6M (NRC staff est imate). Provide an assessment of each Phase 1 SAMA eliminated using Screening Criterion 0 and E to determine whether any Phase 1 SAMAs originally screened should have a Phase 2 cost-benefit evaluation performed. | |
| Provide a Phase 2 cost-benefit evaluation for any SAMA not screened.
| |
| Mr. S. K. Gambhir , Vice President, Technical Services Columbia Generating Station Energy Northwest MD PE04 P. O. Box 968 R i ch l and , WA 99352 November 10, 2010
| |
| | |
| ==SUBJECT:==
| |
| REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION
| |
| -SAM A REVIEW (TAC NO. ME3121)
| |
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| |
|
| ==Dear Mr. Gambhir:==
| | RAI6.j-1 |
| By l etter dated January 19 , 2010, Energy Northwest submitted an application to the U.S. Nuclear Regulatory Commission (NRC) to renew operating license NPF-21 for Co l umbia Generat i ng Stat i on pursuant to Title 10 of the Code of Federal Regulations Part 54. The NRC staff is review i ng the information contained in the license renewal application and the associated Environmental Report. The staff has identified, in the enclosure , areas where additional information is needed to complete the Severe Accident Mitigation Alternatives (SAMA) review. Further requests for additional informat i on may be issued in the future. I tems in the enclosure were discussed with Mr. Abbas Mostala. A mutually agreeable date for the response i s within 60 days from the date of this letter. If you have any quest i ons , please contact me at 301-415-3748 or bye-mail at danie l.doyle@nrc.gov. Docket No. 50-397
| | : i. The uncertainty analysis presented in response to this RAI did not re-evaluate the Phase 1 SAMAs using the maximum uncertainty benefit (from eliminating all internal and external risk) from applying the uncertainty factors provided in Table 6.j-1. Specifically, the maximum baseline benefit in the ER is reported to be $1.9M , while applying the Table 6.j-1 uncertainty factors would increase the maximum benefit to $5.6M (NRC staff estimate). Provide an assessment of each Phase 1 SAMA eliminated using Screening Criterion 0 and E to determine whether any Phase 1 SAMAs originally screened should have a Phase 2 cost-benefit evaluation performed. Provide a Phase 2 cost-benefit evaluation for any SAMA not screened . |
|
| |
|
| ==Enclosure:==
| | ML102870984 OFFICE PM:RPB1 :DLR LADLR BC:RPB1 :DLR PM:RPB1 :DLR NAME DDoyle YEdmonds BPham DDoyle DATE 11/05/10 10/25/10 11/05/10 11/10/10 |
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| As stated cc w/encl: Distribution via Listserv Sincerely , IRA! Daniel Doyle , Project Manager Projects Branch 1 Division of License Renewa l Office of Nuclear Reactor Regulation ADAMS Accession No. ML102870984 OFFICE PM:RPB1 : DLR LADLR BC:RPB1 :DLR PM:RPB1 : DLR NAME DDoyle YEdmonds BPham DDoyle DATE 11/05/10 10/25/10 11/05/1 0 11/10/10 OFFICIAL RECORD COPY Letter to S. Gambhir from D. Doyle dated November 10, 2010
| | Letter to S. Gambhir from D. Doyle dated November 10, 2010 |
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| |
|
| ==SUBJECT:== | | ==SUBJECT:== |
| REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION | | REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION - |
| -SAMA REVIEW (TAC NO. ME3121) DISTRIBUTION:
| | SAMA REVIEW (TAC NO. ME3121) |
| HARD COPY: DLR RF E-MAIL: PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRarb Resource RidsNrrDlrRapb Resource RidsNrrDlrRasb Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource EGettys DDoyle FLyon WWalker , RIV RCohen , RIV LSubin , OGC}} | | DISTRIBUTION: |
| | HARD COPY: |
| | DLR RF E-MAIL: |
| | PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRarb Resource RidsNrrDlrRapb Resource RidsNrrDlrRasb Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource EGettys DDoyle FLyon WWalker, RIV RCohen , RIV LSubin, OGC}} |
Letter Sequence RAI |
|---|
|
Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance, Acceptance
Results
Other: ML100980062, ML101040675, ML101050307, ML101110054, ML101170056, ML101460059, ML103230048, ML103510668, ML110180524, ML111600187, ML11165A023, ML111750188, ML111821975, ML11252B053, ML11291A157, ML11307A393, ML11335A127, ML12044A329, ML12081A275, ML12082A209, ML12181A020
|
MONTHYEARML1009205462010-03-31031 March 2010
Comment (1) of John D. Greenhill on Behalf of Himself Regarding Re-Licensing of Columbia Generating Station
Project stage: Request
ML1009800622010-03-31031 March 2010
Comment (2) of Jerome Delvin Supporting Columbia Generating Stations License Renewal
Project stage: Other
ML1010406752010-04-0202 April 2010
Comment (3) of David V. Taylor, Et. Al., on Behalf of Washington State Legislature, Supporting Energy Northwests License Renewal for Columbia Generating Station to Extend Operating License Through 2043
Project stage: Other
ML1012410372010-04-0606 April 2010
Transcript of Columbia Generating Station License Renewal Process and Environmental Scoping Public Meeting, Evening Session, 04/06/2010, Pages 1-30
Project stage: Meeting
ML1010503072010-04-0606 April 2010
Comment (4) of James O. Luce, on Behalf of Washington State Energy Facility Site Evaluation Council, on Columbia Generating Station License Renewal Application
Project stage: Other
ML1019605472010-04-0606 April 2010
License Renewal, Written Comments of Gene Kinsey from Public Scoping Meeting
Project stage: Meeting
ML1012410022010-04-0606 April 2010
Transcript of Columbia Generating Station License Renewal Process and Environmental Scoping Public Meeting, Afternoon Session, April 06/2010, Pages 1-39
Project stage: Meeting
ML1011100522010-04-0707 April 2010
Comment (5) of Brad Peck, Rick Miller, & Robert E. Koch Supporting Energy Northwests Columbia Generating Station License Renewal Application to the Nuclear Regulatory Commission
Project stage: Request
ML1011604352010-04-0909 April 2010
G20100244/LTR-10-0176/EDATS: SECY-2010-0219 - Ltr., Russell Jim, Storage of Spent Power Reactor Fuel at Columbia Generating Station
Project stage: Request
ML1011100532010-04-0909 April 2010
Comment (6) of Tim Sheldon Supporting Renewal of the Operating License for the Columbia Generating Station
Project stage: Request
ML1011100542010-04-12012 April 2010
Comment (7) of Larry Haler and Brad Klippert on Behalf of the Wa House of Representatives Supporting License Renewal of the Columbia Generating Station Operated by Energy Northwest
Project stage: Other
ML1011700562010-04-12012 April 2010
Comment (8) of Washington State Senate, Supporting License Renewal of Columbia Generating Station Operated by Energy Northwest
Project stage: Other
ML1011804592010-04-19019 April 2010
Comment (9) of Senator Phil Rockefeller, Washington State Adding His Voice to Those Strongly Supporting Relicensing of Columbia Generating Station as an Essential Asset in Washingtons Energy Resources
Project stage: Request
ML1032300482010-04-21021 April 2010
Comment (11) of Various Individuals on Behalf of Energy Northwest Re Environmental Review of Columbia Generating Stations License Renewal
Project stage: Other
ML1012503142010-05-10010 May 2010
Meeting Summary-CGS License Renewal Overview and Environmental Scoping Meetings
Project stage: Meeting
ML1012505192010-05-10010 May 2010
Summary of Public License Renewal Overview and Environmental Scoping Meetings Related to the Review of the Columbia Generating Station License Renewal Application
Project stage: Meeting
ML1014600592010-05-14014 May 2010
Comment (10) of Gary Robertson on Behalf of Washington State, Department of Health, on Environmental Review of Columbia Generating Stations License Renewal
Project stage: Other
ML1017604212010-07-0101 July 2010
Request for Additional Information for the Review of the Columbia Generating Station License Renewal Application - SAMA Review
Project stage: RAI
ML1017506552010-07-0202 July 2010
Request for Additional Information for the Review of the Columbia Generating Station License Renewal Application - Environmental Review
Project stage: RAI
ML1018100912010-07-0808 July 2010
Request for Additional Information Related to the Environmental Site Audit for Columbia Generating Station License Renewal
Project stage: RAI
ML1018802892010-07-15015 July 2010
June 28, 2010, Summary of Telephone Conference Call Held Between NRC and Energy Northwest Concerning Draft Requests for Additional Information Pertaining to the SAMA Review of the Columbia Generating Station License Renewal Application
Project stage: Draft RAI
GO2-10-105, Response to Request for Additional Information License Renewal Application2010-08-0505 August 2010
Response to Request for Additional Information License Renewal Application
Project stage: Response to RAI
ML1023802882010-08-0909 August 2010
Response to Request for Additional Information License Renewal Application, Enclosure B, Terrestrial Ecology Documents
Project stage: Response to RAI
GO2-10-108, Response to Request for Additional Information, License Renewal Application2010-08-0909 August 2010
Response to Request for Additional Information, License Renewal Application
Project stage: Response to RAI
ML1021003032010-08-10010 August 2010
Schedule Revision for the Environmental Review of the Columbia Generating Station License Renewal Application
Project stage: Approval
GO2-10-138, Response to Request for Additional Information on License Renewal Application2010-09-17017 September 2010
Response to Request for Additional Information on License Renewal Application
Project stage: Response to RAI
ML1026302282010-10-0101 October 2010
Summary of Tribal Outreach Informational Meeting Concerning Columbia Generating Station License Renewal and Hanford Low Level Waste
Project stage: Meeting
ML1028709842010-11-10010 November 2010
Request for Additional Information for the Review of the Columbia Generating Station License Renewal Application-Sama Review
Project stage: RAI
ML1035106682010-12-17017 December 2010
E-mail Dtd 12/17/2010, Subj: NRC Ba/Efh Assessment for Columbia Generating Station License Renewal Review
Project stage: Other
GO2-10-178, Response to Request for Additional Information License Renewal Application2010-12-21021 December 2010
Response to Request for Additional Information License Renewal Application
Project stage: Response to RAI
ML1027702322010-12-29029 December 2010
Issuance of Environmental Scoping Summary Report Associated with the Staffs Review of the Application by Energy Northwest for Renewal of the Operating License for Columbia Generating Station
Project stage: Approval
ML1034305262011-01-10010 January 2011
Schedule Revision for the Review of the Columbia Generating Station License Renewal Application
Project stage: Approval
ML1034001632011-01-18018 January 2011
Summary of Site Visit in Support of the Environmental Review of the License Renewal Application for Columbia Generating Station
Project stage: Approval
ML1101805242011-01-18018 January 2011
License Renewal, e-mail Dated 1/18/2011
Project stage: Other
GO2-11-032, Response to Request for Additional Information for the Review of the License Renewal Application2011-01-28028 January 2011
Response to Request for Additional Information for the Review of the License Renewal Application
Project stage: Response to RAI
GO2-11-025, Response to Request for Additional Information on License Renewal Application2011-01-28028 January 2011
Response to Request for Additional Information on License Renewal Application
Project stage: Response to RAI
ML1104005102011-03-0101 March 2011
1/19/11 Summary of Telephone Conference Call Held Between USNRC and Energy Northwest Concerning Requests for Additional Information Pertaining to the SAMA Review of the Columbia Generating Station License Renewal Application
Project stage: RAI
ML1106703792011-03-10010 March 2011
Request for Additional Information for the Review of the Columbia Generating Station License Renewal Application - Severe Accident Mitigation Alternative Review
Project stage: RAI
GO2-11-082, Environmental Authorizations for CGS Operations2011-04-20020 April 2011
Environmental Authorizations for CGS Operations
Project stage: Request
GO2-11-092, Response to Request for Additional Information Related to the Review of the Severe Accident Mitigation Alternative Analysis2011-05-0606 May 2011
Response to Request for Additional Information Related to the Review of the Severe Accident Mitigation Alternative Analysis
Project stage: Response to RAI
ML11157A0362011-06-0505 June 2011
Letter from Heart of America Northwest Public Involvement Lists and Notices, Including Requests to Be Added to Lists and Requests for Hearings on the Draft EIS for Columbia Generating Station
Project stage: Request
ML1116001872011-06-0909 June 2011
E-mail Dtd 6/9/11, Subj: Energy Nw, Columbia Generating Station Public Involvement and Notice List, Request for Hearings Re EIS
Project stage: Other
ML11151A2222011-06-14014 June 2011
Schedule Revision for the Environmental Review of the Columbia Generating Station License Renewal Application
Project stage: Approval
ML1116802212011-06-16016 June 2011
Request for List of Protected Species within the Area Under Evaluation for the Columbia Generating Station License Renewal Application Review
Project stage: Request
ML1117501882011-06-23023 June 2011
Environmental Authorizations for Current CGS Operations
Project stage: Other
ML1118219752011-06-27027 June 2011
E-mail Dtd 6/27/2011, Subj: NRC Ba/Efh Assessment for Columbia Generating Station License Renewal Review
Project stage: Other
ML11165A0232011-08-23023 August 2011
Biological Assessment and Essential Fish Habitat Assessment for License Renewal of Columbia Generating Station
Project stage: Other
ML11214A2372011-08-30030 August 2011
RAI for the Review of the Columbia Generating Station LRA-Severe Accident Mitigation Alternative Review
Project stage: RAI
ML11227A0072011-08-31031 August 2011
NUREG-1437 Supp 47 Dfc Generic Environmental Impact Statement for License Renewal of Nuclear Plants Regarding Columbia Generating Station.
Project stage: Acceptance Review
ML11252B0532011-09-0101 September 2011
Comment (1) of Robert G. Whitlam, on Behalf of Washington Dept of Archaeology & Historic Preservation Columbia Generating Station License Renewal
Project stage: Other
2010-08-10
[Table View] |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 November 10, 2010 Mr. S. K. Gambhir, Vice President, Technical Services Columbia Generating Station Energy Northwest MD PE04 P. O. Box 968 Richland, WA 99352
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION -
SAMA REVIEW (TAC NO. ME3121)
Dear Mr. Gambhir:
By letter dated January 19, 2010, Energy Northwest submitted an application to the U.S.
Nuclear Regulatory Commission (NRC) to renew operating license NPF-21 for Columbia Generating Station pursuant to Title 10 of the Code of Federal Regulations Part 54. The NRC staff is reviewing the information contained in the license renewal application and the associated Environmental Report. The staff has identified, in the enclosure , areas where additional information is needed to complete the Severe Accident Mitigation Alternatives (SAMA) review.
Further requests for additional information may be issued in the future .
Items in the enclosure were discussed with Mr. Abbas Mostala. A mutually agreeable date for the response is within 60 days from the date of this letter. If you have any questions, please contact me at 301-415-3748 or bye-mail at daniel.doyle@nrc.gov.
Sincerely, Daniel Doyle, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-397
Enclosure:
As stated cc w/encl : Distribution via Listserv
Request for Additional Information Regarding the Analysis of Severe Accident Mitigation Alternatives for the Columbia Generating Station License Renewal Review
Background:
The NRC issued a previous request for additional information (RAI) related to the Severe Accident Mitigation Analysis (SAMA) review to Energy Northwest by letter dated July 1, 2010 (ADAMS Accession Number ML101760421). Energy Northwest provided a partial response to the RAls by letter dated September 17, 2010 (ADAMS Accession Number ML102660151).
The purpose of this request for additional information is to provide clarification on Energy Northwest's partial response (referred to in this document as "the response") dated September 17,2010.
RAI 3.d(i)-1 The response states that the "electronic database used to select and locate cables does not include all conduit locations," and that "most, but not all" of the multiple spurious equipment operations (MSOs) that may need to be modeled have been captured and that, for those not captured, the response to RAI 6.j will account for the incompleteness. The response continues to the conclusion that "model incompleteness is judged to be encompassed by the provided sensitivity analysis," which includes the use of a 95th percentile uncertainty band on the base fire core damage frequency (CDF). (The response to RAI 6.j further cites sensitivity analysis via the 95th percentile approach.) As Columbia estimates a fire CDF using an analysis that goes beyond the typical fire individual plant examination - external events (lPEEE), enhancements to reduce potential conservatisms, as well as enhancements to remove potential non-conservatisms, that might exist in an IPEEE-like estimate of fire CDF should be present. For example, source-target-specific fire scenarios should have been used in lieu of more conservative assumptions of total room burn-up; and hot short probabilities typically of at least 0.3 shou ld have been assumed in lieu of potentially non-conservative lower values. Please describe these enhancements, including those used with regard to compensating for any incompleteness in the cable location database and modeling of MSOs as cited in the response . .
ENCLOSURE
RAI6.j-1
- i. The uncertainty analysis presented in response to this RAI did not re-evaluate the Phase 1 SAMAs using the maximum uncertainty benefit (from eliminating all internal and external risk) from applying the uncertainty factors provided in Table 6.j-1. Specifically, the maximum baseline benefit in the ER is reported to be $1.9M , while applying the Table 6.j-1 uncertainty factors would increase the maximum benefit to $5.6M (NRC staff estimate). Provide an assessment of each Phase 1 SAMA eliminated using Screening Criterion 0 and E to determine whether any Phase 1 SAMAs originally screened should have a Phase 2 cost-benefit evaluation performed. Provide a Phase 2 cost-benefit evaluation for any SAMA not screened .
ML102870984 OFFICE PM:RPB1 :DLR LADLR BC:RPB1 :DLR PM:RPB1 :DLR NAME DDoyle YEdmonds BPham DDoyle DATE 11/05/10 10/25/10 11/05/10 11/10/10
Letter to S. Gambhir from D. Doyle dated November 10, 2010
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION -
SAMA REVIEW (TAC NO. ME3121)
DISTRIBUTION:
HARD COPY:
DLR RF E-MAIL:
PUBLIC RidsNrrDlr Resource RidsNrrDlrRpb1 Resource RidsNrrDlrRpb2 Resource RidsNrrDlrRarb Resource RidsNrrDlrRapb Resource RidsNrrDlrRasb Resource RidsNrrDlrRerb Resource RidsNrrDlrRpob Resource EGettys DDoyle FLyon WWalker, RIV RCohen , RIV LSubin, OGC
