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Reset

English translation: return to normal or default state

21:34 Sep 5, 2016
English language (monolingual) [PRO]
Science - Nuclear Eng/Sci
English term or phrase: Reset
The operators reset the reactor core isolation cooling (RCIC) system turbine steam stop valve in the MCR and restarted the RCIC system, but it shut down immediately after the restart.
Masoud Kakoli
Iran
Local time: 13:12
Selected answer:return to normal or default state
Explanation:
The normal state of a switch in the mains unit of domestic electrical supply is 'ON' so that current flows in the circuit controlled by that switch. If excess current is drawn in that circuit, the switch trips (i.e. it is turned off) and must be manually reset to its normal 'ON' position.

The normal state, however, is not always the default state. A new mobile phone, for example, comes with factory settings. This is its default state. The purchaser then customises it by installing apps, adding details of accounts, choosing a screensaver etc. This is the normal state of the phone but it can be reset to the default state at any time.

I don't know whether the valve in your example is normally on or off, but resetting it puts it back in its normal state.
Selected response from:

Piyush Ojha
United Kingdom
Local time: 09:42
Grading comment
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
5 +3return to normal or default state
Piyush Ojha
Summary of reference entries provided
RCIC Valve Controls
Erzsébet Czopyk

Discussion entries: 5





  

Answers


1 hr   confidence: Answerer confidence 5/5 peer agreement (net): +3
reset
return to normal or default state


Explanation:
The normal state of a switch in the mains unit of domestic electrical supply is 'ON' so that current flows in the circuit controlled by that switch. If excess current is drawn in that circuit, the switch trips (i.e. it is turned off) and must be manually reset to its normal 'ON' position.

The normal state, however, is not always the default state. A new mobile phone, for example, comes with factory settings. This is its default state. The purchaser then customises it by installing apps, adding details of accounts, choosing a screensaver etc. This is the normal state of the phone but it can be reset to the default state at any time.

I don't know whether the valve in your example is normally on or off, but resetting it puts it back in its normal state.

Piyush Ojha
United Kingdom
Local time: 09:42
Native speaker of: Native in EnglishEnglish, Native in HindiHindi
PRO pts in category: 8

Peer comments on this answer (and responses from the answerer)
agree  Yvonne Gallagher: yes, the simple standard meaning of reset..
10 hrs
  -> Thanks, Gallagy.

agree  Erzsébet Czopyk: C
13 hrs
  -> Thank you, EC.

agree  Yasutomo Kanazawa
16 hrs
  -> Thank you, Yasumoto.
Login to enter a peer comment (or grade)




Reference comments


11 hrs
Reference: RCIC Valve Controls

Reference information:
http://www.nrc.gov/docs/ML1125/ML11258A311.pdf
The purpose of the Reactor Core Isolation Cooling (RCIC) System is to provide makeup water to the reactor vessel for core cooling. RCIC performs this function when the main steam lines are isolated or the condensate and feedwater system is not available. The RCIC system is capable of maintaining vessel inventory 15 minutes after reactor shutdown. The RCIC system is lined up such that it can initiate with a complete loss of AC power. All valves required to support initiation are either DC powered or open in the standby lineup.

The RCIC System (Figure 2.7-1) utilizes a steam turbine driven pump for delivering water to the reactor vessel. Steam from main steam line "A", upstream of the main steam isolation valve (MSIV) drives the RCIC turbine. The steam from the RCIC turbine exhausts to the suppression pool.

The RCIC System can be manually initiated by the operator or it initiates automatically at Level 2 (-38"). The steam to turbine valve will close at Rev 09/11 2.7-3 USNRC HRTD Level 8 (+56.5"). The system can cycle between Level 2 and Level 8 without operator action.

2.7.3.11 RCIC Valve Controls
The major RCIC System valves respond to automatic inputs from the RCIC initiation,
automatic isolation or turbine trip circuits. In addition they may be remotely operated from the control room or remote shutdown panel.
Except for the inboard steam line isolation valve, power for valve operations is from 125 VDC. The inboard steam line isolation valve uses emergency 480 VAC bus power and is normally open. This allows the RCIC system to operate if all AC power is lost to the station.

2.7.4.4 Automatic Isolation
The steam supply line to the RCIC turbine is part of the nuclear system process barrier.
The Nuclear Steam Supply Shutoff System provides automatic isolation signals to
isolate the RCIC System. The isolation of the RCIC System when a leak is detected
minimizes the release of radioactive material.

Erzsébet Czopyk
Hungary
Native speaker of: Native in HungarianHungarian
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