ML20042B058
| ML20042B058 | |
| Person / Time | |
|---|---|
| Issue date: | 02/26/1982 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19275K506 | List: |
| References | |
| NUDOCS 8203240508 | |
| Download: ML20042B058 (2) | |
Text
{{#Wiki_filter:_ 3,/)}figh FEB "c 'A2 MEMORANDUM FOR: All Operating Reactors Project Managers (ORB #1-5) g, FROM: Thomas M. Novak, Assistant Director for Y. C Operating Reactors, DL Ph p yi w -{ n,. 1 .. ~ METHODOLOGY AND ASSOCIATED RELOADS 6\\ ~ J, "r
SUBJECT:
SCHEDULE FOR REVIEW 0F TOPICAL REPORTS ON RETRA d 7, ~ / g 's l',, The Utility Group for Regulatory Applications informed the NRC staffMO L that several of their member utilities intend to submit topical reports in 1982 describing their methodology for transient analysis using the RETRAN computer code. These methods would then be applied to support future reloads when necessary. The Reactor Systems Branch is now in the process of organizing and allocating the resources required to complete the review of these topicals and the associated reloads. In order for the Reactor Systems Branch to be able to plan, conduct and complete this work in an efficient and effr;tive manner, they need a forecast of this workload. I request that you call your respective utilities and obtain their assistance in completing the.questi,onnaire contained in Enclosure 1. Since OMB approval was required to conduct tnis survey, a copy of the OMB clearance request is contained in enclosure 2. You may consider this as an example should you need to request OMB clearance for any surveys you are asked to perform in the future. The key to expediting OMB approval appears to be our ability to correlate a survey request to our current Part 50 clearance. Please complete this request within five working days of the date of this memo. You are to give the completed questionnaire to Ed Tourigny. He is located in Room 437 and can be reached on X27545 if you need assistance. This request for information was approved by the Office of Management and Budget under Part 50 clearance number 3150-0011. Your cooperation is appreciated. ) -( h f l OricM s;gnud by: p e l 8203240508 820226 Thomas M. Novak, Assistant Director for "O R FD LTR PDR hent2 4,h
Enclosure:
As stated RAClark ETournigny NRC PDR Y. I I cc: D. Eisenhut B. Sheron PKreutzer Local PDR f b ORBCs J. Carter ORB Rda l R. Mattson J. Long TMNovak Q. Miller T. Speis 'l p , ^, -. 4F9573 omcE ) . 0L ORML .DL .7.. t 0k;9.RBf
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e e.. / UNITED STATES f g NUCLEAR REGULATORY COMMISSION g E WASHINGTON, D. C. 20'>S5 \\.....*',8, FEB 2 61982 t MEMORA'NDUM FOR: All Operating Reactors Project Managers (ORBil-5) FROM: Thomas M. Novak, Assistant Director for Operating Reactors, DL
SUBJECT:
SCHEDULE FOR REVIEW OF TOPICAL REPORTS ON RETRAN METHODOLOGY AND ASSOCIATED RELOADS The Utility Group for Regulatory Applications informed the NRC staff that several of their member utilities intend to submit topical reports in 1982 describing their methodology for transient analysis using the RETRAN computer code. These methods would then be applied to support future reloads when necessary. The Reactor Systems Branch is now in the process of organizing and allocating the _ resources required to complete the review of these topicals and the associated reloads. In order for the Reactor Systems Branch to be able to plan, conduct and complete this work in an efficient and effective manner, they need a forecast of this workload. I request that you call your respective utilities and obtain their assistance in completing the questionnaire contained in Enclosure 1. Since OMB approval was required to conduct this survey, a copy of the OMB clearance request is contained in enclosure 2. You may consider this as an example should you need to request OMB clearance for any surveys you are asked to perform.in the future. The key to expediting OMB approval appears to be our ability to correlate a survey request to our current Part 50 clearance. Please complete this request within five working days of the date of this memo. You are to give the completed questionnaire to Ed Tourigny. He is located in Room 437 and can be reached on X27545 if you need assistance. This request for information was approved by the Office of Management and Budget under Part 50 clearance number 3150-0011. Your cooperation is appreciated. A~/ Thomas M. Novak, Assistant Director for Operating Reactors, DL Enciosure: As stated cc: D. Eisenhut B. Sheron ORBCs J. Carter R. Mattson J. Long J. Miller T. Speis J. Berggren
o. o Telephone Questionnaire Regarding RETRAN Methodology Topical Reports Project Manager: ORB # Utility Station Name(s): Unit (s) -Question 1: Do you expect to submit to NRC topical reports supporting RETRAN Methodology during the calender years 1982 or 1983? Answer 1: Question 2: If so, when*? Answer 2: Question 3: If so, when do you want NRC to complete the review of your topical submittals*? Answer 3: Question 4: Do you expert to use RETRAN to support a reload in 1982 or 19837 Answer 4: Question.5: If so, when*? Answer 5:
- Please specify month and year.
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a. .s ucg ! [' e 7 jo, UNITED STATES {.()) j: lg NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Sd7..OT/ FEB 18 982. 1 MEMORANDUM T0: Valeria Wilson NRR OMB Coordinator FROM: Robert Clark, Chief Operating Reactors B, ranch #3, DL
SUBJECT:
OMB Clearance Request Please make arrangements for DMB to review the enclosed clearance request. An approval by February 28, 1982 would be most helpful. E. G. Tourigny. of my staff is the contact in this matter. Thank you for your cooperation, f '-u>~ Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing A4 Y Qi 2.fisISu M.H.' Williams, Technical Assistant Div.ision of Licensing / e / 5 )}C 9 '0 0 sF
3 OMB CLEARANCE REQUEST Proposed Survey on Schedule for Review of Topical Reports on RETRAN Methodology and Associated Reloads RETRAN is a computer code approach for analyzing the thermal-hydraulic response of Nuclear Steam Supply Systems to hypothetical !.oss of Coolant Accidents and Operational Transients.. It is the NRC staff's understanding that utilities intend to submit topical reports describing their methodology for transient analysis using this computer code. These methods would then be applied to support future reloads when necessary. What the NRC staff needs to know is (A) which utilities will be submitting these topical reports in 1982 and 1983, (B) when do these utilities require corapletion of NRC staff analysis, and (C) will these utilities use RETRAN to support a reload application in 1982.or 1983? The NRC staff needs to know this information so that (1) it can perform its dut'ies in an efficient and effective ~ manner and (2) utility schedules for implementation of this computer code to support reload applications will not be unnecessarily extended out in time awaiting the completion of the NRC review. The RETRAN computer code is applicable to light-water reactor (LWR) systns. The code would be utilized to support nuclear fuel reloads. The code anf reloads would come under the following paragraphs of 10 CFR, Part 50: (1) 50'46 Acceptance criteria for emergency core cooling systems for and LWRs and ECCS Evaluation Models. RETRAN could be used to Appendix demonstrate to the staff that the licensee meets 50.46 and K Appendix K, II.l.a. (2) 50.59 Changes, Tests, and Experiments. Some fuel reloads require changes to the utility's license. RETRAN could be used to support a reload license application. Therefore, this information comes under Part 50 and is being primarily requested to assess the industry's use of this code to meet 10 CFR 50, paragraph 50.46 and Appendix K, II.l.a. In order to obtain this information, each project manager (about 50 total) will conduct a telephone survey asking each nuclear utility (about 50 total) questions A through C above. The telephone inquiry should. require less than 30 minutes on the part of the project manager and the utility. The information would be used by the NRC staff in organizing and allocating NRC resources to complete the review of these topical reports in an efficient, effective, and timely manner. Total cost to NRC is estimated to be about 25 person-hours; total cost to utilities is estimated to be about 25 person-hours. In each case, this was determined by multiplying 50 persons times one half hour. OMB clearance is requested as an add on' to the NRC present Part 50 clearance. E
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k, [ 6 ABSTRACT .s ..r; - c.+..: I RETRAN represents a new computer code approach for analyzing the thermal-hydraulic ( response of Nuclear Steam Supply Systems (NSSS') to hypothetical Loss of Coolant Accidents (LOCA) and Operational Transients. In contrast to the " conservative" approach, RETRAN'provides "best estimate" solutions to hypotheti. cal LOCAs and Operational Transients. RETRAN is a computer code package (eveloped from the'RELAP series of codes, from reference' data, and from extensive analytical and experimental work previously conducted relative to the thermal-hydraulic behavior of light-water reactor systems subjected to postulated accidents and operational transient con'di-tions. The RETRAN computer code is constructed in a semimodular and dynamic dimensioned form where additions to the code can be easily carried out as new and improved models are developed. This report (the first of a four-volume conputer code manual) presents the derivation of the general equations, the constitutive f models and numerical solution schemes that form the bases of the RETRAN computer code. The three companion volumes describe the programming details, the user input and code output, and the verification and qualification performed with RETRAN. E e e \\ l l l ,}}