著者

尾本 彰 杉崎 利彦 長坂 秀雄

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会誌 (ISSN:00047120)

巻号頁・発行日

vol.28, no.10, pp.950-956, 1986

---

Many integral and separate effect experiments have been carried out cooperatively by the Japanese BWR utilities and vendors. Through these results, various counter-current-flow limitation phenomena occurring inside the BWR core, steam and mist cooling effect, multibundle effect etc. have been identified effectively to cool down the core during LOCA transients.<BR>Based on these findings and with other aids, SAFER code, which can better estimate the thermal-hydraulics of the BWR transient by the simple one-dimentional method, has been developed by the BWR vendors to replace with the existing SAFE-REFLOOD-CHASTE code system. <BR>The new code predicts the peak-cladding-temperature for the standard jet-pump BWR LOCA transients to be as high as 500600&deg;C, which is well below the current regulatory limitation. LOCA/ECCS constraints will be reduced for future BWR core managements and ECCS equipments surveillance etc. by the use of new code.

著者

長坂 秀雄 飛松 敏美 田原 美香 横堀 誠一 秋永 誠

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.2, no.3, pp.240-250, 2003-09-25 (Released:2010-03-08)

参考文献数

8

被引用文献数

1 2

---

This paper deals with the system interaction performance of the BWR drywell local cooler (DWC) in combination with containment spray as a Japanese Phase-II accident management (AM). By using almost full height simulation test facility (GIRAFFE-DWC) with volumetric scaling ratio of 1/600 for a typical BWR containment, the system integral tests simulating BWR low pressure vessel failure sequence were accomplished during about 14 hours. In case of DWC application, the containment pressure increase was found milder due to DWC heat removal performance. Initial spray timing was delayed about 3 hours and each spray period was reduced almost by half, which contributed to the containment gas compression. These containment pressure transients were confirmed by analyzing the severe accident analysis code of MELCOR. It was concluded that the application of a BWR DWC to Phase-II AM measure is quite promising from the point of delaying or preventing the containment venting.