to
English translation: to the Condensate Storage tank of the RCIC system
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| 06:32 Jun 7, 2016 |
| English language (monolingual) [Non-PRO] Science - Nuclear Eng/Sci | |||||||
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|  Selected response from: LSanders United States Local time: 00:27 | ||||||
Grading comment
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| SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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| 4 +1 | to the Condensate Storage tank of the RCIC system |
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| Discussion entries: 7 | |
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Answers
1 hr confidence: 
to Explanation: I have no specialist knowledge of nuclear power stations; however, I read this as follows: " ... the contents of the //freshwater source to reactor core isolation// cooling system,// the condensate storage tank (CST),// for reactor water injection// was being depleted." i.e. " ... the contents of the cooling system ... were being depleted." Q. What cooling system? A. "the freshwater source to reactor core isolation cooling system". Q. Where were these contents held? A. in "the condensate storage tank". Q. What was this water used for? A. "for reactor water injection". So, the fresh water was not "going toward" the reactor core isolation cooling system; it was already a component of that cooling system, which stretched from the freshwater source to the reactor core isolation. -------------------------------------------------- Note added at 10 hrs (2016-06-07 16:36:04 GMT) -------------------------------------------------- @Asker I really cannot make sense of your note. The freshwater source supplies the "reactor core isolation cooling system" and can, therefore, be seen as a part of that system. (That's simply equivalent to considering refrigerant fluid to be part of an air conditioning system.) The reactor core isolation is cooled by that system. Your parsing of the sentence fails to identify what was being depleted, which appears to me to be the contents of the cooling system (i.e. the freshwater conducted by that system from the freshwater source to the reactor core isolation). Presumably, the condensate storage tank plays a role in that system; otherwise, why on earth is it mentioned? I hazard a guess that the condensate is, itself, fresh water and can, therefore, be fed into the cooling system, supplementing the main supply. Indeed, that guess can be verified by this reference: https://en.wikipedia.org/wiki/Boiling_water_reactor_safety_s... "Reactor core isolation cooling system (RCIC) "The reactor core isolation cooling system is not an emergency core cooling system proper, but it is included because it fulfills an important-to-safety function which can help to cool the reactor in the event of a loss of normal heat sinking capability; or when all electrical power is lost. It has additional functionality in advanced versions of the BWR. "RCIC is an auxiliary feedwater pump meant for emergency use. It is able to inject cooling water into the reactor at high pressures. It injects approximately 2,000 L/min (600 gpm) into the reactor core. It takes less time to start than the HPCI system, approximately 30 seconds from an initiating signal. It has ample capacity to replace the cooling water boiled off by residual decay heat, and can even keep up with small leaks. "The RCIC system operates on high-pressure steam from the reactor itself, and thus is operable with no electric power other than battery power to operate the control valves. Those turn the RCIC on and off as necessary to maintain correct water levels in the reactor. (If run continuously, the RCIC would overfill the reactor and send water down its own steam supply line.) During a station blackout (where all off-site power is lost and the diesel generators fail) the RCIC system may be "black started" with no AC and manually activated. The RCIC system condenses its steam into the reactor suppression pool. The RCIC can make up this water loss, from either of two sources: a makeup water tank located outside containment, or the wetwell itself." -------------------------------------------------- Note added at 10 hrs (2016-06-07 16:38:50 GMT) -------------------------------------------------- Note the sentence in the above: "The RCIC system condenses its steam into the reactor suppression pool." Which would seem to be where the "condensate storage tank" comes into play. -------------------------------------------------- Note added at 10 hrs (2016-06-07 16:40:46 GMT) -------------------------------------------------- So, the second of my three Qs and As above was actually wrong as the condensate storage tank only supplies part of the contents of the cooling system. |
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Notes to answerer
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12 hrs confidence: peer agreement (net): +1
peer agreement (net): +1to the Condensate Storage tank of the RCIC system Explanation: As far as I understand, the CST is a component within the overall RCIC system. Therefore you could reorganize the sentence to read: "Meanwhile, in Unit 2, the source of freshwater content to the condensate storage tank (CST) of the RCIC system, for reactor water injection, was being depleted." See link for a schematic of the RCIC system: https://nrcoe.inel.gov/resultsdb/publicdocs/SystemStudies/rc... https://nrcoe.inel.gov/resultsdb/publicdocs/SystemStudies/rcic-system-description.pdf |
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