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Lesson 9. Description of projects Accident presentations Overview of NCSE. Project description. Project description. Project description (2). Project description (3). Structure of an NCSE. Cover sheet. Strict format: see example. Outline of Typical CSE. Introduction

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Lesson 9


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lesson 9
Lesson 9
  • Description of projects
  • Accident presentations
  • Overview of NCSE
cover sheet
Cover sheet
  • Strict format: see example
outline of typical cse
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
introduction
Introduction
  • Why the work is being done
  • Revision history
  • Necessary administrative boilerplate
outline of typical cse1
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
description of process
Description of process
  • Necessary description of the process
    • Overview of the procedural steps
    • Important interactions with preceding and following processes (and any others)
  • Necessary description of the hardware
    • Gloveboxes, canisters, storage racks, etc. (Include pictures)
    • Relative positions, etc.
    • Special materials
  • Different variations allowed in geometry and process (important to criticality)
  • Compare to the Contingency Table to make sure that all of the relevant MAGICMERV normal parameters are mentioned
outline of typical cse2
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
computational methodology
Computational Methodology
  • Non-KENO
    • Indication that relying on ANS-8.1 limits and/or hand calculational techniques
  • KENO
    • Indication that relying on criticality calculations+
      • Basis of criticality control (k-safe)
    • Boilerplate on the codes used
    • Description of the computer used
      • Point to the verification document
    • Summarize validation and point to the Validation appendix
outline of typical cse3
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
discussion of contingencies
Discussion of contingencies
  • Parametric review: Checklist of parameters important to criticality in THIS analysis
    • mass, absorbers, geometry, interaction, concentration, moderation, enrichment, reflection, volume
  • Contingency analysis
    • Definition of normal case vs. parameters
    • Definition of credible accidents vs. parameters
  • Contingency table including controls
outline of typical cse4
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
normal accident analysis
Normal & accident analysis
  • Materials discussion, including assumptions (point to appendix)
  • Normal Model development
    • Normal & accident
    • Simplified through the use of parametric studies
  • Contingency case models as variation on normal model
normal accident analysis 2
Normal & accident analysis (2)
  • JUST DO IT: Calculate the normal case and each of the contingencies you have identified
  • Table of results that stands alone
    • Like Tables in Section 6.4 of ExampleCSE
    • Enough column to differentiate cases (repeat columns from contingency table, if desired)
    • Keff+/-sigma column AND Keff+2sigma column
    • Mark the limiting case with BOLD or larger font (or both)
  • Discuss results in text
analysis phase
Analysis phase
  • Table of results that stands alone
    • Like Tables in Section 6.4 of ExampleCSE
    • Enough column to differentiate cases (repeat columns from contingency table, if desired)
    • Keff+/-sigma column AND Keff+2sigma column
    • Mark the limiting case with BOLD or larger font (or both)
outline of typical cse5
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
postings controls
Postings & controls
  • Description of:
    • Engineered safety features
    • Administrative controls
    • Operator aids
      • Procedural changes
    • Postings
  • Most important and most often referred to
  • Very controlled format
    • Posting
    • Basis
what you control
WHAT you control
  • Limits are set so that criticality cannot occur when operators comply with the limits
  • Examples
    • Mass limit is 350 g 235U (i.e., maximum mass)
    • Mass limit is 200 g 239Pu (i.e., maximum mass)
    • Concentration limit is 1 g 235U/liter (i.e., maximum concentration)
    • Moderation limit is H/U = 4 (i.e., maximum moderation)
    • Volume limit is 4 liters (i.e., maximum volume)
    • Container limit is 4 containers (i.e., maximum number of containers)
    • Spacing limit is 2 feet (i.e., minimum spacing)
    • Stacking limit is 4 high (i.e., maximum number of items in a stack)
how you control
HOW you control
  • Your NCSE will include the following sections:

7.1 Engineered safety features

7.2 Procedural requirements

7.3 Postings

  • Remember our preference
    • Passive control: railroad bridge over highway
    • Active control: lights and gate at railroad crossing
    • Administrative: stop sign at railroad crossing
control selection
Control Selection
  • Passive engineered control examples
    • Mass: container design (i.e., limit container size)
    • Absorption: solid poisons (Raschig rings, boron-Al plates
    • Geometry: container design (slab tanks, pencil tanks, bottle diameter)
    • Interaction: spacers (storage racks, bird cages, carts)
    • Moderation: sealed containers or systems (covers on storage racks to exclude sprinkler water)
    • Reflection: spacers (storage racks, bird cages)
    • Volume: container design
writing controls
Writing Controls
  • Clear
  • Concise
  • Unambiguous
  • Doable
    • Simple and easy to perform
    • Directly controllable by operator
  • Language that an operator will understand
  • Relates to upset/change that needs to be prevented
procedures general
Procedures- General
  • Procedures provide instructions to perform tasks:
    • Administrative
    • Technical
    • Maintenance
    • Emergency
    • Ranked according to safety significance
  • Procedures for fissionable material operations are reviewed by NCS Engineers
    • Should be scheduled
    • Comments should be documented
    • Comment resolution/procedure approval is documented
  • Good “conduct of operations” requires verbatim compliance with procedures (so make sure it is possible!)
postings
Postings
  • Immediate information that the operator would NOT be expected to remember from training
  • Very controlled format in Sect. 7
    • Control
    • Basis: Tied directly to Section 5 (Do not add or subtract)
  • Similarly controlled format in the posting itself:
    • Important words CAPITALIZED and possibly in a stand-out color
    • Few articles (a, an, the)
    • No convoluted IF/THEN syntax (KISS)
postings1
Postings
  • As we discussed before, Section 7 contains the postings and basis for each
  • In addition, Appendix C contains PowerPoint slide examples of the Postings themselves
outline of typical cse6
Outline of Typical CSE
  • Introduction
  • Description of process
  • Computational methodology
  • Discussion of contingencies
  • Normal & accident analysis
  • Postings & controls
  • Summary & conclusions
  • Appendices
summary conclusions
Summary & conclusions
  • Summary
  • Conclusions
appendices
Appendices
  • A. Materials and compositions
  • B. Input and output listings
  • C. Postings
  • D. Comment review sheets
  • E. Validation check sheets (Deleted - no longer required)
  • F. Validation report
  • G. Parametric studies
appendix c postings example
Appendix C: Postings (Example)
  • Nuclear Criticality Safety Limits and Controls
  • NO MORE than 4300 kg Plutonium per 8-liter container.
  • •NO MORE than ONE operator may carry ONE 8-liter container at a time to the drum loading area.
app h parametric studies
App. H: Parametric Studies
  • Stand alone pre-analysis studies in order to refine the normal case (What is normal?)
  • Ideal: Perturbations on limiting case
  • At minimum:
    • PS#1 = Worst case of concrete
    • PS#2 = 12” of water is infinite
    • PS#3 = 6% water for sprinkler is conservative
  • Follow format of AppendixH.doc in public area

34

parametric studies
Parametric studies
  • Arise out of modeling questions
    • Most reactive material makeup
    • Most reactive reflection
    • Most reactive placement of fissile (primary)
    • Most reactive arrangement of other material (including other fissile elements)
    • Acceptability of modeling simplification (e.g., leaving out walls, ceilings, etc.)
  • Sometimes order matters—you want to clear up the most “independent” modeling questions first to use in the others

35

parametric study example
Parametric study example
  • You are analyzing storage of four 10 liter canisters in a 90x90x90 cm glovebox against a wall (Pu-239/water mixture)
  • Assume the “normal” case still has the following ambiguities:
    • H/D range of .8 to 1.2
    • Placement of canisters in glovebox
    • Type of concrete (among 4 SCALE choices)
    • Optimum H/X ratio
  • What parametric studies would you run?
  • In what order?

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