PMID- 32704166
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20201023
LR  - 20210723
IS  - 2045-2322 (Electronic)
IS  - 2045-2322 (Linking)
VI  - 10
IP  - 1
DP  - 2020 Jul 23
TI  - Structural health monitoring of metal-to-glass-ceramics penetration during 
      thermal cycling aging using femto-laser inscribed FBG sensors.
PG  - 12330
LID - 10.1038/s41598-020-69282-7 [doi]
LID - 12330
AB  - Maintaining the mechanical strength and hermetic reliability of 
      metal-to-glass-ceramics electrical penetration assembly (MTGC-EPA) is a key 
      concern for ensuring the pressure boundaries of nuclear power plants. The 
      transient temperature change caused by power adjusting or accidents in High 
      Temperature Reactor Pebble-bed Modules may affect the structural health of 
      sealing glass-ceramics, even leading to radiation leakage. To evaluate whether 
      the function could survive temperature variations during the service life, 
      thermal cycling aging experiments were imposed to MTGC-EPA. A grating 
      length-mismatched sensing method to monitor the residual strain, an important 
      factor of glass-ceramics structural health, was demonstrated in real-time by 
      femto-laser inscribed fiber Bragg grating (FBG) sensor during the curing process 
      and thermal cycling aging. Scanning electron microscope (SEM) and leakage rate 
      tests were carried out to obtain the comparisons of microstructure and 
      hermeticity before and after the thermal cycling. The residual strain showed a 
      slight growth trend with thermal cycles repetition and it persisted a high value 
      (~ 4,000 muepsilon) reflected by both Bragg wavelength shift and spectrum shape. The 
      grating length mismatched single FBG embedded in glass-ceramics was feasible to 
      demodulate the temperature and strain simultaneously, and the embedded FBG method 
      achieved the structural health monitoring of MTGC-EPA during thermal cycling 
      aging with good accuracy and reliability. Combining with the results of SEM and 
      leakage rate detecting, the structural health of MTGC-EPA was demonstrated to be 
      capable to endure the severe thermal conditions in nuclear reactors.
FAU - Fan, Zhichun
AU  - Fan Z
AD  - Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced 
      Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation 
      Center for Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 
      100084, China.
FAU - Diao, Xingzhong
AU  - Diao X
AD  - Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced 
      Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation 
      Center for Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 
      100084, China.
FAU - Hu, Kangjia
AU  - Hu K
AD  - Institute of Nuclear and New Energy Technology, Beijing Key Laboratory of Fine 
      Ceramics, Tsinghua University, Beijing, 100084, China.
FAU - Zhang, Yong
AU  - Zhang Y
AD  - Institute of Nuclear and New Energy Technology, Beijing Key Laboratory of Fine 
      Ceramics, Tsinghua University, Beijing, 100084, China.
FAU - Huang, Zhiyong
AU  - Huang Z
AD  - Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced 
      Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation 
      Center for Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 
      100084, China.
FAU - Kang, Yanbo
AU  - Kang Y
AD  - Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced 
      Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation 
      Center for Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 
      100084, China.
FAU - Yan, He
AU  - Yan H
AD  - Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced 
      Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation 
      Center for Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 
      100084, China. yanhe@tsinghua.edu.cn.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20200723
PL  - England
TA  - Sci Rep
JT  - Scientific reports
JID - 101563288
SB  - IM
PMC - PMC7378200
COIS- The authors declare no competing interests.
EDAT- 2020/07/25 06:00
MHDA- 2020/07/25 06:01
PMCR- 2020/07/23
CRDT- 2020/07/25 06:00
PHST- 2019/09/03 00:00 [received]
PHST- 2020/07/06 00:00 [accepted]
PHST- 2020/07/25 06:00 [entrez]
PHST- 2020/07/25 06:00 [pubmed]
PHST- 2020/07/25 06:01 [medline]
PHST- 2020/07/23 00:00 [pmc-release]
AID - 10.1038/s41598-020-69282-7 [pii]
AID - 69282 [pii]
AID - 10.1038/s41598-020-69282-7 [doi]
PST - epublish
SO  - Sci Rep. 2020 Jul 23;10(1):12330. doi: 10.1038/s41598-020-69282-7.