loss	freq(1/yr)
(A) Maintenance
  - long			 60	0.5
  - medium		  5	  1
  - short (adjustment)	0.5	 12
------------------------------------
                    subtotal    41.0 days
(B) Malfunctions
  - laser exchange		 4	0.2
  - DGS system error	 4	0.5
  - AEL malfunction		 4	1.0
  - FCL accident		 4	1.0
  - suspension break	50	0.2
  - DAS PC exchange		 1	0.5
  - local sensor error	 1	0.5
------------------------------------
                    subtotal    21.8 days

------------------------------------
                       total    62.8 days (=17.2%)

長期メンテナンスの内訳は以下です:
 昇温(15d)+真空リーク(0.1d)+作業(10d)+真空(4.9d)+冷却(30d)=60d

干渉計休止時間の内訳は以下の通りです(頻度×ロス)。

IFO unlock	1/day	20 min
laser down	1/year	1 hour
MC unlock		2/year	30 min
OMC adjust	2/year	30 min
big earthquake	1/week	2 hour
others		1/week	2 hour
------------------------------------
              total    0.91 hours/day (=3.80%)

(1-0.172)x(1-0.0380)=0.7964