TY - JOUR

T1 - Start-up core physics tests of high temperature engineering test reactor (HTTR), (II). First criticality by an annular form fuel loading and its criticality prediction method

AU - Fujimoto, Nozomu

AU - Nakano, Masaaki

AU - Takeuchi, Mitsuo

AU - Fujisaki, Shingo

AU - Yamashita, Kiyonobu

PY - 2000

Y1 - 2000

N2 - The HTTP has achieved the first criticality on 11/10/98. The fuels were loaded into the core from outer region to inner region to obtain characteristic data of annular cores. The annular core is expected to be a core type of future HTGR. Fuel loading schedule was planned based on preliminary calculations by Monte Carlo method. These calculations predicted the first criticality at 16 ± 1 columns. However, the reactor achieved the first criticality at 19 columns. The first criticality was re-predicted by comparing measured and calculated 1/M curves. The calculated 1/M curves were obtained for different critical mass adjusting some parameters such as the amount of impurities, etc. The method is called "1/M sandwich method". This method well predicted the number of fuel columns at the first criticality. The combination of this method with Monte Carlo calculation was a rational method for predicting the first criticality. It was confirmed that Monte Carlo calculation could be used for the evaluation of HTTR with < 1% of error for fully loaded core.

AB - The HTTP has achieved the first criticality on 11/10/98. The fuels were loaded into the core from outer region to inner region to obtain characteristic data of annular cores. The annular core is expected to be a core type of future HTGR. Fuel loading schedule was planned based on preliminary calculations by Monte Carlo method. These calculations predicted the first criticality at 16 ± 1 columns. However, the reactor achieved the first criticality at 19 columns. The first criticality was re-predicted by comparing measured and calculated 1/M curves. The calculated 1/M curves were obtained for different critical mass adjusting some parameters such as the amount of impurities, etc. The method is called "1/M sandwich method". This method well predicted the number of fuel columns at the first criticality. The combination of this method with Monte Carlo calculation was a rational method for predicting the first criticality. It was confirmed that Monte Carlo calculation could be used for the evaluation of HTTR with < 1% of error for fully loaded core.

UR - http://www.scopus.com/inward/record.url?scp=0034583816&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034583816&partnerID=8YFLogxK

U2 - 10.3327/jaesj.42.458

DO - 10.3327/jaesj.42.458

M3 - Article

AN - SCOPUS:0034583816

VL - 42

SP - 458

EP - 464

JO - Nippon Genshiryoku Gakkaishi/Journal of the Atomic Energy Society of Japan

JF - Nippon Genshiryoku Gakkaishi/Journal of the Atomic Energy Society of Japan

SN - 0004-7120

IS - 5

ER -