Term
MS
Describe what SRVs are on each MS line. |
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Definition
-A steam line: A & E.
-B steam line: G & B.
-C steam line: H & C.
-D steam line: D & F.
All good heavy dogs eat big chewy frogs. |
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Term
MS
Describe the purpose of the flow restrictor. |
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Definition
-Protect fuel barrier by limiting steam flow to 200% of rated in case of a main steam line rupture outside primary containment.
-Also provides a means of measuring flow. |
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Term
MS
Describe the power supplies to the MSIVs. |
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Definition
-Inboard MSIVs: Y-70/D-11.
-Outboard MSIVs: Y-80/D-21. |
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Term
MS
Describe which line HPCI is aligned to. |
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Definition
| B steam line inside drywell. |
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Term
MS
Describe which line RCIC is aligned to. |
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Definition
| C steam line inside drywell. |
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Term
MS
Describe the blowout panels. |
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Definition
-Assures Rx building integrity.
-Designed to fail out from the steam chase to the turbine building floor.
-D/P of .25psi. |
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Term
MS
Describe which lines the steam jet air ejectors and recombiner steam are aligned to. |
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Definition
| Tap off of the A & B steam lines. |
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Term
MS
Describe the group I isolation signals. |
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Definition
-Rx low low water level: -47".
-Hi MS flow: 135-140%.
-Hi steam chase temp: 195-200F.
-Low MSL pressure: 840# when in run. |
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Term
MS
Describe what closes on a group I isolation. |
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Definition
-MSIVs.
-MSL drain valves.
-RWCU sample valves. |
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Term
MS
Describe which line the Rx head vent is aligned to. |
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Definition
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Term
MS
Describe the equalizing headers. |
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Definition
-Equalizing header in drywell and steam chase to equalize pressure around MSIVs.
-Equalizing line supplies turbine bypass valve header, turbine steam seal system regulator, and condenser deaerating system.
-Equalizing line in hotside to allow testing of turbine stop valves at full power. |
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Term
MS
Describe operation of MS drain valves. |
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Definition
| Valve open/closed signal is seal in. |
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Term
MS
Describe the Main Steam Line Leakage alarm. |
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Definition
| If main steam line flow exceeds turbine first stage flow by 400,000lbs/hr or more after 30 second time delay. |
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Term
MS
Describe the steam chase high temperature alarm setpoint. |
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Definition
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Term
MS
Describe radiation detection for MS. |
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Definition
-MSLs monitored for radioactivity by chambers just downstream of outboard MSIVs.
-Provide annunciation for upscale (6Rem) and downscale.
-Trip the MVP on upscale alarm. |
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Term
MS
Describe MSIV cycling time. |
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Definition
-Between 3 to 9.9 seconds to close (air and spring).
-Between 45 to 60 seconds excercise time (spring only).
-During a LOCA MSIV springs may not be enough to shut valves due to drywell pressurization. |
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