• Proceedings of the Korean Nuclear Society Conference
• /
• 2002.05a
• /
• pp.260.1-260
• /
• 2002

• Proceedings of the Korean Nuclear Society Conference
• /
• 2004.05a
• /
• pp.320.2-320.2
• /
• 2004

• Nuclear industry
• /
• v.4 no.1 s.17
• /
• pp.70-71
• /
• 1984

지난해 11월 4일 국내 각 신문은 캐나다의 토론토발 연합통신의 기사를 연재, $\ulcorner$캐나다 정부는 캔두(CANDU)형 원자로 압력관의 안전도에 대한 우려가 고조되고 있는 가운데 고위관계자들로 구성된 긴급기술조사단을 구성, 캐나다와 한국을 비롯한 외국에 설치된 모든 캔두형 원자로의 안전여부를 조사하기로 했다$\cdots$$\cdots$$\lrcorner$고 크게 보도하여 물의를 일으킨바 있다. 이에 대하여 당사자인 캐나다 원자력공사는 같은 11월 17일자로 해명서를 발표, $\ulcorner$동기사는 월성원자력 발전소의 안전성을 진단하기 위하여 캐나다로부터 조사반을 파견하는 것으로 되어 있으나 이는 전혀 사실과 다르다. 캐나다 원자력공사는 $\ulcorner$픽커링$\lrcorner$원자력발전소의 사고와 관련하여 캔두원자로 보유국에 그 사고내용을 설명하고 최신 원자로의 안전성을 설득시키기 위하여 관계자를 파견할 계획이었으며 이번 우리들의 방한은 그 목적을 위해서 이루어진 것이다$\lrcorner$라고 말하고 다음과 같이 해명하고 있는데 그 요지는 다음과 같다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.27 no.3
• /
• pp.455-463
• /
• 2003

The aim of this study is to investigate the hydrogen embrittlement of Zr-2.5Nb CANDU pressure tube at room temperature. The transverse tensile and fracture toughness tests were performed at various hydrogen concentrations using transverse tensile specimens and CCT (curved compact tension) specimens. These specimens were directly machined from the pressure tube retaining original curvatures. Based on the results of these tests. the hydrogen embrittlement phenomenon was clearly observed and fracture toughness parameters of Zr-2.5Nb pressure tube materials such as, $K_{J(0.2)}$.$J_{ML}$.dJ/da, were dramatically decreased with the increasement of the hydrogen concentration. From microscopic observation by SEM and TEM, it was also revealed that various shapes dimples, fissures and quasi-cleavage were found at the hydrogen-absorbed materials with hydrides while traditional shape dimples were generally located at the as-received materials Through the comparison of the hydride and fissure lengths with the hydrogen concentration the new evaluation method of hydrogen embrittlement was suggested.

• Proceedings of the KSME Conference
• /
• 2004.04a
• /
• pp.54-59
• /
• 2004

In this paper probabilistic fracture mechanics(PFM) approach is employed to evaluate the integrity of CANDU Zr-2.5Nb pressure tubes. Modified failure assessment diagram(Jr-FAD), plastic collapse, and critical crack length(CCL) approach are used for evaluating failure probability of the tubes. Jr-FAD was extended from the Kr-FAD because fracture of pressure tubes occurs in brittle manner due to hydrogen embrittlement of material by deuterium fluence. For developing the probabilistic integrity evaluation module, AECL procedures and fracture toughness parameters of EPRI were used.