ML20044B678
| ML20044B678 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 12/07/1992 |
| From: | Mattia M NRC OFFICE OF ADMINISTRATION (ADM) |
| To: | Mattson R SCIENTECH, INC. |
| References | |
| CON-FIN-L-1933, CON-NRC-04-91-068, CON-NRC-4-91-68 NUDOCS 9303010338 | |
| Download: ML20044B678 (9) | |
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WASHINGTON, D. C. 20555
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DEC 071991 Scientech, Inc.
ATTN:
Roger J. Mattson 11821 Parklawn Drive Rockville, MD 20852
Dear Mr. Mattson:
Subject:
Contract No. NRC-04-91-068, Task Order No. 12 Entitled, Individual Plant Examination (IPE) Reviews, Internal Events - Back-End Only (Browns Ferry Unit 2)"
In accordance with Section G.9 entitled, " Task Order Procedures" of the subject contract, this letter definitizes Task Order No.12.
The effort shall be performed in accordance with the enclosed Statement of Work.
Task Order No. 12 shall be in effect from December 2, 1992 through May 31, 1993, with a total cost ceiling of $15,853.00. The amount of $14,394.00 represents the total estimated reimbursable costs, the amount of $119.00 represents the facilities capital cost of money, and the amount of $1,340.00 represents the fixed fee.
The obligated amount of this task order is $15,853.00.
Accounting Data for Task Order No.12 is as follows:
APPN No.:
31X0200.360 B&R No.:
36019202300 FIN No.:
L1933 OBLIGATED AMOUNT:
$15,853.00 RES IDENTIFIERS:
RES-C93-015 and RES-C93-028 The following individuals are considered to be essential to the successful performance of work hereunder: James Meyer and Michael Stamatelatos.
The contractor agrees that such personnel shall not be removed from the effort under the task order without compliance with Contract Clause H.1, Key Personnel.
Issuance of this task order does not amend any terms or conditions of the subject contract.
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9303010338 921207
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g PDR CONTR j-NRC-04-91-068 PDR
4' NRC-04-91-068 Task Order No. 12 Page 2 Your contacts during the course of this task order are:
Technical Matters:
John Flack Project Officer (301) 492-3979 Contractual Matters:
Anita Hughes Contract Administrator (301) 492-8353
'I Please indicate your acceptance of this Task Order No. 12 by having an official, authorized to bind your organization, execute three copies of this document in the space provided and returra two copies to the Contract
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Administrator.
You should retain the third copy for your records.
i If you have any questions regarding this matter, please contact Anita Hughes, Contract Administrator, on (301) 492-8353.
Sincerely, i
Ma y Jo fiatiha, Contracting Officer Contract Administration Branch No. 2 Division of Contracts and Property Management Office of Administration
Enclosure:
As stated ACCEPTE[E:
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W Mr n Eccefrh, D! rector TITLE: Cean n f.a._
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< ~y Contract NRC-04-91-068 Scientech
.i STATEMENT OF WORK Task Order - 12 l
TITLE: Individual Plant Examination (IPE)' Reviews, Internal Events Back-end Only (Browns Ferry Unit 2)
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DOCKET NUMBER:
E NRC PROJECT MANAGER:
John H. Flack, RES (301-492-3979)
NRC TEAM LEADER FOR BROWNS FERRY UNIT 2:
Ed Chow, RES (301-492-3984) i
. TECHNICAL MONITOR:
John H. Flack, RES (301-492-3979)
PERIOD OF PERFORMANCE:
December 2, 1992 through May 31, 1993 BACKGROUND On November 23, 1988, the NRC issued Generic' Letter 88-20, f
" Individual Plant Examination," which stated.that licensees of.
existing plants should perform a systematic avamination' (IPE)..to identify ~any plant-specific vulnerabilities to severe l accidents,.
and to report the results to the Commis'sion.
The purpose of the IPE is to have each utility. (1) develop an overall. appreciation
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of severe accident behavior; (2) understand the. most likely severe accident sequences at its plant; (3): gain a quantitative understanding of the overall probability of core. damage and~
radioactive' material' releases; and (4) reduce the overall' probability of core damage and radioactive, releases by modifying procedures and hardware to prevent or mitigate' severe accidents.
All IPE submittals will be reviewed by the NRC Stp,Tf to determine if licensees met-the intent of Generic Letter 88-20'.
-I OBJECTIVE The purpose of this contract is to solicit contractor support in
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order to enhance the NRC review of licensees' IPE'submittals.
This' contract includes-the examination and evaluation of the Browns Ferry Unit 2 IPE submittal, specifically with regard to the "back-end" analysis.
The contractor review will be of
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linited scope and consist of a " submittal only" review.
The
" submittal only" review and gathering of associated insights will 1
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r help the NRC staff determine whether the licensee's IPE process met the intent of Generic Letter 88-20, or whether a more detailed review is warranted.
By identifying the IFEs strengths and weaknesses, extracting' important' insights and findings, and providing a comparison to staff reviewed and accepted PSAs (e.g. NUREG-1150, PSAs identified in NUREG-1335 Appendix B), it is expected that the NRC will be in a better position to expeditiously evaluate the licensee's IPE process.
To provide support under this contract, the contractor will search for obvious errors, omissions and inconsistencies in the IPE submittal as described in the work requirements listed below.
WORK REOUIREMENTS AND' SCHEDULE The contractor will perform a " submittal only" review of the Browns-Ferry Unit 2 "back-end" IPE analysis.
[The review is to include only the Level II analysis.
Review of Level III (consequence analysis) is beyond the scope of this contract.]
The contractor shall provide the qualified specialists and the necessary facilities, materials, and services.to carry out such a review.
The contractor will utilize NRC review guidance documents for detail and reference as well as other interin guidance provided by the NRC Technical Monitor.
The contractor is not expected to make a plant / site visit in order to perform this review.
Subtask 1.
Review and Identification of IPE Insichts Perform a back-end " submittal only" review of each IPE submittal and identify important IPE insights by completing the NRC IPE Data Summary Sheets.
(The sheets identify the information that will be entered into the IPE insights and findings data base.)
During the review, focus on the areas described below under " Work Requirement."
The contractor will note any: (1) inconsistencies between methodology employed in the-IPE submittals and other PSA studies, (2) inconsistencies between the submittal's IPE findings and findings stemming from other PSAs (See NUREGm1335, Appendix B).
The contractor will respond explicitly to ea'ch work requirement by noting important review findings including any IPE strengths and weaknesses.
The contractor will also list under each listed work requirement, any questions (back to the licensee) associated with the lack of appropriate information or need for further clarification.
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y Work Reauirement 1.1.
Perform a General Review of the Licensee's IPE Back-End Analvtic Process:
Check the following:
1.1.1 The IPE submittal is essentially complete with' respect to the level of detail requested in NUREG-1335.
1.1.2 IPE employed methodology is clearly described and justified for selection.
Approach is consistent with Generic Letter 88-20 Appendix 1.
1.1.3 The IPE employed a viable process to confirm that the containment and containment systems represent the as-built, as-operated plant.
1.1.4 IPE back-end had been appropriately peer-reviewed to help assure the analytic techniques were correctly applied.
Work Recuirement 1.2.
Review of the containment analysis / characterization.
Check the following:
1.2.1 The IPE analysis appropriately treated front-end and back-end dependencies, i.e.,
plant damage states considered reactor systeg/ containment system availability, system mission times, inventory depletion, dual usage (spray vs. injection) 1.2.2 Classes of sequences with significant probability (those that meet the G.L. 88-20/NUREG-1335 screening criteria) were evaluated further using simplistic, but.
realistic, containment event trees.
1.2.3 The focus of the IPE's containment analysis was on failure modes and timing.
Containment failure modes are consistent with those identified in.* Table 2.2 of NUREG-1335.
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1.2.4 The IPE process assessed and identified contributors to containment isolation failure.
1.2.5 System / human response were integrated with the phenomenological aspects of accident progression into the containment event trees.
Allowances for recovery actions were made to allow for accident management actions.
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1.2.6 The IPE submittal appropriately documented radionuclide release characterization for accident sequences exceeding the Generic Letter 88-20 (or NUREG-1335) screening criteria.
Work Reauirement 1.3.
Review the cuantitative nature of the accident orocression and containment performance analysis Check the following 1.3.1 The licensee employed a reasonable process to understand and quantify severe accident progression.
The process lead to a determination of important conditional containment failure probabilities, and considered phenomenological uncertainties, either qualitative or quantitative.
1.3.2 Dominant contributors to containment failure are t
consistent with insights from other PSAs of similar design.
1.3.3 The IPE appropriately characterized containment performance for each of the CET end-states by assessing containment loading (either calculated or referenced).
1.3.4 The containment analysis considered the impact of severe accident environments on equipment behavior.
Work Recuirement 1.4.
Review the IPE annroach to reducina the probability of core damaae or fission product release.
Check the following:
1.4.1 The IPE analysis appears to support the licensee's definition of vulnerability, and that the definition provides a means by which the identification of potential vulnerabilities (as so defined) and plant modifications (or safety enhancements) is made possible.
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1.4.2 The identification of plant improvements and proposed modifications are reasonably expected to enhance plant safety.
Work Recuirement 1.5 Review Licensee's Response to Containment Performance Improvement Recommendations check that the licensee appropriately responded to recommendations stemming from the Containment Performance Improvement (CPI) Program, i.e.,
that the licensee's assessment, 4
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findings, conclusions and actions (as appropriate) considered the following as a function of containment type:
BWRs (MARK I,II,III) o harden vent, o
alternative water supply for drywell spray / vessel injection, enhanced reactor pressure vessel depressurization o
system reliability, implementation of Revision 4 of the BWR Owners o
Group EPGs.
improved hydrogen igniter power. supply (Mark III).
o Additional for BWR (MARK III) o evaluation of vulnerability to interrupted power supply to hydrogen igniters and need for improvement, PWR Ice Condenser Containments o
evaluation of vulnerability to interrupted power supply to hydrogen igniters and need for improvement, PWR Dry Containments o
evaluation of containment and equipment vulnerabilities to hydrogen combustion (local and global) and need for improvement.
This would include consideration of' gaseous pathways between the cavity and the upper containment volume to confirm adequate communication to promote natural circulation and recombination of combustible gases t
in the reactor' cavity.
Work Reauirement 2.0 Comolete data sheets.
Complete the NRC data summary sheets and note any' Sack of information as appropriate.
Subtask 2.
Prepare Technical Evaluation Report Prepare a report with the outline provided below.
I.
Introduction Provide a brief overview of the IPE review, the scope and depth as appropriate.
Place emphasis on review areas identified as being important and rationale for importance, i.e.,
found to be important in other PSAs of similar design.
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4 Discuss any important or unique plant characteristics.
Note plants with similar features and any important insights stemming from other relevant PSA studies.
II.
Contractor Review Findings Explicitly address each work requirement element listed under subtask 1, " Review and Identification of IPE Insights."
Discuss any strength or weakness so identified and significance with respect to the overall IPE effort.
Identify any additional information (in the form of questions back to the licensee) which would be important to the review effort.
Indicate why the information-is important for closure.
III. Overall Evaluation and Conclusion Summarize the'" submittal only" review conclusions based on the information submitted and significance of IPE strengths add weaknesses.
IV.
IPE Evaluation and Data Summary Sheets l
Attach the IPE Data Summary Sheets.
REPORT REOUIREMENTS Technical Reports The contractor will submit to the NRC technical monitor two copies of the Technical Evaluation Report (TER) six weeks after the initiation of this contract.
Copies will include one hard copy and one 3.5" computer diskette version'(Wordperfect 5.1 or other IBM PC compatible software acceptable to the NRC IPE Team Leader).
The TER shall summarize all findings, results, and-conclusions in the areas examined in the format described under Task 2.
If the contractor finds that the licensee's IPE is obviously deficient in any of the areas examined,'the technical monitor should be notified in advance.
Deficient.or weak areas should be clearly documented in the technical evaluation report.
In addition, if the contractor finds that there are specific areas that need additional in-depth review, the Team Leader should be notified of the areas, and provided with the rationale for subsequent review.
The contractor should allow for a one day of effort to provide NRC with quick-turn-around reviews of licensee's comments or responses to the TER and/or questions.
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TECHNICAL PROGRESS REPORT-The contractor shall provide monthly progress reports in accordance with Subsection F.3 of. the basic contract.
TRAVEL One, one person trip to NRC Headquarters to present and discuss review findings 3
and conclusions.
PERSONNEL QUALIFICATIONS
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It shall be the responsibility of the contractor to assign technical staff, employees, and subcontractors who have the required educational background,_
t experience, or combination th'ereof, to meet both the technical and regulatory
't objectives of the work specified in this 50W. The NRC will rely on representation made by the contractor concerning the qualifications of the personnel proposed for assignment to this task order including assurance that all information contained in the technical and cost proposals, including-r resumes and conflict of interest disclosures, is accurate and truthful.
NRC FURNISHED MATERIAL
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Licensee's IPE~ submittal TECHNICAL DIRECTION i
The NRC Project Manager is:
John H. Flack Severe Accident Issues Branch Division of Safety Issue Resolution U.S. NRC, Mail Stop NL/S 324 Washington, DC 20555 i
Telephone No. (301) FTS 492-3979 t
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