Drain Holes for Criticality Safety Control Guidance for the Analyst

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Drain and overflow holes are integral to the nuclear criticality safety basis of many processes and provide different functions in achieving their safety goal. In most cases, unverified engineering judgement was used to conclude that the holes were adequate to accomplish their mission. Such judgement may adequately serve some configurations but is inadequate in other applications. It was determined that the exact function of every hole for both normal and upset process conditions must be understood and clearly documented. Y-12 has embarked on an effort to document engineering analyses of drain and overflow holes. This effort is essential to demonstrating ... continued below

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5 Pages

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LeTellier, m.s. & Smallwood, d.j. November 30, 1998.

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Description

Drain and overflow holes are integral to the nuclear criticality safety basis of many processes and provide different functions in achieving their safety goal. In most cases, unverified engineering judgement was used to conclude that the holes were adequate to accomplish their mission. Such judgement may adequately serve some configurations but is inadequate in other applications. It was determined that the exact function of every hole for both normal and upset process conditions must be understood and clearly documented. Y-12 has embarked on an effort to document engineering analyses of drain and overflow holes. This effort is essential to demonstrating that the holes are capable performing their intended safety function. The Y-12 EUO approach is based on criticality safety function and engineering analysis. The main components of the policies regarding drain holes are: C The criticality safety requirements are written in terms of function (e.g., depth in pan filter must always be less than 5 cm). C Engineering justifications are being written to show existing drains meet required function. Sometimes, detailed analysis of inflows and outflows is required. In some other cases, physical functional tests are performed. C Drains are documented on controlled drawings to ensure configuration control. A program of periodic inspections (usually annual) is in place for each required drain.

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5 Pages

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  • Sixth International Conference on Nuclear Criticality Safety, 9/20-24/1999, Versailles, France

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  • Other: DE00006063
  • Report No.: Y/DD-868 Abstract
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6063
  • Archival Resource Key: ark:/67531/metadc696959

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 30, 1998

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • May 6, 2016, 11:16 p.m.

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LeTellier, m.s. & Smallwood, d.j. Drain Holes for Criticality Safety Control Guidance for the Analyst, article, November 30, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc696959/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.