Oak RidgeSNS Experimental Facilities

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SNS MPS Review

Target-MPS Review

WBS 1.6.8

Ron Battle

Target Controls, Target Systems

Experimental Facilities Division

September 11, 2001

Oak RidgeSNS Experimental Facilities

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Target control system will output to MPS

• The Target I&C systems include the following:– Target Protection System (TPS)—safety class– Nuclear Facility Safety Significant (NFSS) system—safety

significant– Target control system—non-safety PLCs and IOCs– Target Moderator controls are separate PLCs

• Target control system PLCs will have contact outputs to the MPS to trip the beam to protect target equipment

• The TPS parameters will be isolated inputs to the Target control system. These parameters will also trip the beam through the MPS

• The NFSS has some parameters that are inputs to the MPS through the target control PLC.

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Target Protection System functions

• The TPS cuts the proton beam off when either the mercury cooling water system or the PMCS flow fails to prevent mercury overheating or boiling.

• The TPS is a safety class, dual redundant, analog system.

• The TPS trips the proton beam on low mercury flow or high mercury temperature. This tripping mechanism is independent of all others.– Flow is determined from pump differential pressure and

from a flow tube in the mercury return flow– Mercury temperature is measured at the outlet of the heat

exchanger.

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Target control overview

• The Target control system has two PLCs with distributed I/O that control the Target systems utilities, Target mercury loop, and supervisory control of the hydraulic shutter drives.– MPS instruments that are redundant will input to separate

I/O modules but not to separate PLCs

• The Ring Injection Dump control design is by Target Systems, but control will be from the Ring control system. There are no direct links from Target controls to the Ring Injection Dump controls.

• The Target control system has an output to the MPS PLC

• One Target System IOC contains a FPS card that with input trips from the Target control system

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Target Systems MPS trip parameters

• Light water loop 1 to mercury heat exchanger– Low inlet flow to heat exchanger– Low outlet flow from heat exchanger– High exit water temperature, redundant– Both water pumps tripped– Low level in the gas/liquid separator tank

• LWS 2 water to Target shroud, proton beam window, & PBW box.– Low inlet flow to shroud, PBW, or PBW box– Low outlet flow from shroud or combined PBW & PBW box.– High exit water temperature from shroud, PBW, or PBW

box.– Both water pumps tripped– Low level in the gas/liquid separator tank

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Target Systems MPS trip parameters, con’t

• LWS3, Moderators / shutters / inserts cooling loop– Low inlet flow to ambient & cryogenic moderators– Low inlet flow to upstream & downstream cryogenic

moderators– Low flow in the combined return line– High exit temperature from combined ambient & cryogenic

moderators– High exit temperature from combined upstream &

downstream cryogenic moderators– Both water pumps tripped– Low level in the gas/liquid separator tank

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Moderator MPS trip parameters

• Moderator control system is separate from Target control system, but it will connect to EPICS

• Moderator control system outputs to MPS– Hydrogen differential pressure (flow), redundant– Hydrogen temperature high, redundant

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Target Systems MPS trip parameters, con’t

• D2O cooling loop to the reflector plugs (cooling still being analyzed, but the following trips may be implemented)– Both water pumps tripped– Combined return flow– Low level in the gas/liquid separator tank

– Further analysis required for the four inner reflector flows and temperatures

• Other utility MPS trips (all redundant)– High pressure in target plug inflatable seal vacuum– High pressure in vessel when operating in vacuum mode– High pressure in vessel when operating in helium mode– High O2 or H2 concentration in vessel when in helium mode– Detection of leaks into the core vessel drain– Moderator H2 line helium buffer pressure high or low

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Ring Injection Dump MPS trip parameters,

• Injection dump utilities– Low inlet flow to beam stop– Low inlet flow to vacuum window– Low outlet flow from combined beam stop & vacuum

window– High exit water temperature from beam stop– High exit water temperature from vacuum window– Both water pumps tripped– Low level in the gas/liquid separator tank

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Target Systems MPS trip parameters, con’t

• Mercury loop MPS trip parameters– Low return mercury flow– Low bulk 1, bulk2, or window flow– Mercury pump differential pressure– Mercury pump reservoir level– Trip of the mercury pump– Detection of leak into the Target interstitial region– High mercury temperature, redundant

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Target control system QA

• The Target control system & instrumentation—MPS and non-safety—are being designed and fabricated to QA level 2.

• Safety class and safety significant are being designed to QA level 1.

• The Target utilities instrument specifications, installation details, and wiring diagrams will be completed in January 2002.

• Software design for the Ring Injection Dump will begin in January 2002.