安全使用年限

1
safety service life
... 名义已使用年限 nominal serviced life 安全使用年限 safety service life 标准使用年限 guideline life ...
2
safe service life
safe service life ==> 安全使用年限 safe shutdown ==> 安全停机,安全停堆［状态］,反应堆处于足够次临界深度，并以可控速率排出堆芯余热，安全壳的密封得到保证，...

1
为了保证既有桥的安全运营和尽可能延长其安全使用年限，应对既有桥进行检测、评估。
In order to making the existing bridge safety operation and extending its safe serving time, the bridge detection and evaluation should be done.
2
达到报废年限后需继续使用的，必须经机动车安全技术检验机构检验合格。
It must pass the motor vehicle safety inspection to be used after reaching retirement life.
3
为确保地铁结构不渗不漏，满足运营安全和结构使用年限要求，做好地铁结构永久防水至关重要。
The permanent waterproof measures of Beijing Metro are very important to ensure no seepage and leakage axed to satisfy transportation safety and structure operational life requirements.

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