Emergency Operating Procedures (EOPs) [1] provide prioritized response strategies that guide the operator in management of emergency transients. A desirable attribute of EOPs is optimal recovery from the transient. To achieve this, it is necessary to develop more realistic criteria rather than criteria based on traditional licensing analysis methods. One such application is evaluating measured core makeup flow during the recirculation phase of a Loss of Coolant Accident (LOCA) with adverse containment environment. During the recirculation phase of a LOCA, the adequacy of the internal recirculated water flow (from the containment sump) is confirmed by individual loop measured injection flows satisfying EOP criteria. Of particular concern is the flow split in the loop emergency cooling injection lines and the potentially large instrument uncertainty associated with measuring low flow rates. In the event one of the injection lines spills to containment (and possibly without a line spilling), traditional analysis methods based criteria would suggest adequate makeup flow may not be confirmed, and consequently the EOPs would prescribe external recirculation, which is not the preferred mode. In the present paper the EOP criteria for post LOCA core cooling flow is developed — using better estimate methods. Several (significantly) less restrictive analysis assumptions were identified and a new/materially different approach from that used in the past was taken. As result a more robust flow criterion was obtained — simpler and permitting about 0.019 m3/s [300 gpm] less flow.
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ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4948-4
PROCEEDINGS PAPER
Better Estimate Analysis for Use in Emergency Operating Procedure During a Loss of Coolant Accident Available to Purchase
Daniel M. Speyer,
Daniel M. Speyer
The Cooper Union for the Advancement of Science and Art, New York, NY
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Jong E. Chang,
Jong E. Chang
Entergy Nuclear, White Plains, NY
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Ardesar Irani
Ardesar Irani
Entergy Nuclear, White Plains, NY
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Daniel M. Speyer
The Cooper Union for the Advancement of Science and Art, New York, NY
Jong E. Chang
Entergy Nuclear, White Plains, NY
Ardesar Irani
Entergy Nuclear, White Plains, NY
Paper No:
FEDSM-ICNMM2010-31283, pp. 1545-1552; 8 pages
Published Online:
March 1, 2011
Citation
Speyer, DM, Chang, JE, & Irani, A. "Better Estimate Analysis for Use in Emergency Operating Procedure During a Loss of Coolant Accident." Proceedings of the ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C. Montreal, Quebec, Canada. August 1–5, 2010. pp. 1545-1552. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-31283
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