ML20217N224
| ML20217N224 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/22/1997 |
| From: | Meekhoff D NORTHEAST NUCLEAR ENERGY CO. |
| To: | |
| Shared Package | |
| ML20217N155 | List: |
| References | |
| 1-OM-7.1, NUDOCS 9708260069 | |
| Download: ML20217N224 (8) | |
Text
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9 1-OM-7.1, Rev. 0 l , Page 1 of 8 Millstone Unit One O OPERATIONS MANUAL SECTION 7.1 "ALAIGIS AND INDICATIONS" Sponsor: D. J. Meekhoff //22[97 Effective Date TABLE OF CONTENTS PAGE NUMBER 1.0 PURPOSE 2 2.0 GENERAL 2 3.0 PARAMETERINDICATION ACCURACY 2 4.0 ALARM RESPONSE - CONTROL ROOM 3 5.0 ALARM RESPONSE DURING TESTING 4 6.0 ALARM RESPONSE - LOCAL PANELIEQUIPMENT 5 7.0 NUISANCE ALARMS 6 t 8.0 NUISANCE ALARMS - PROCESS COMPUTER 6 9.0 SINGLE INPUT FAILURES OF MULTI-INPUT ANNUNCIATORS 7 10.0 CONTROL ROOM PANEL LABELING (including Annunciators) 7 Approved By:
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1.0 - . PURPOSE 1.1 Define management expectations concerning proper response to, and control of, plant alarms and indications.
2.0 GENERAL 2.1- Alarms are waming features designed to advise personnel of a situation that is not within normal parameters.
2.1.1 Most alarms are in the form of annunciators in the Control Room (CR) or on local panels at various locations throughout the plant.
2.1.2 Local alarms mounted on equipment (such as continuous air monitors) not associated with annunciator panels are outside the scope of this Section.
~ 2.1.3 All Control Operators on shift shall remain aware of plant status, including the reason for any annunciators in alarm status.
2.2 Respond to annunciators and audible process computer alarms in accordance with i this OM Section.
2.2.1 Alam1 response requirements as described in this Section are not required for anticipated alarms that occur as a result of a planned evolution (i.e., SP performance, plant startup/ shutdown, etc.).
2.3 Identify malfunction 1ng or out of service alarms.
2.4 - All personnel performing actions in the field that may actuate an alarm in the CR should notify the CR before performing the action (s).
3,0 PARAMETERINDICATION ACCURACY
- 3.1 Operators shall believe installed Unit instrumentation to be correct unless proven faulty by direct comparison with other instruments monitoring the same variable, or by instrument functional testing or calibration. Ignoring an unusual reading because the operator suspects the instrument is faulty may cause abnormal conditions to go
- undetected, in general, when unexpected readings are observed, Operators shall check other indications where possible.
3.2 . Operators shall respond conservatively to instrument indications when credibility of the
.( . indication is in doubt.
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k 1-oM 7.1. Rw. 0 Page 3 of 8 3.3 - Operators shall be alert and attentive to control board indications and alarms. While computer trend groups provide useful data, they should not be used to replace frequent monitoring of control board indications. Control board indications shall be monitored frequently, with prompt actions taken as specified in the applicable procedure (OP, ARP, EOP, ONP) to determine the cause of and correction for abnormalities.
3.4 If there is doubt concerning the accuracy or appropriateness of a display, Operators shall immediately notify the Shift Manager / Unit Supervisor.
3.4.1 Shift Management should initiate an investigation of any device displaying unusual or abnormal information and take appropriate compensatory i actions.
3.4.2 When malfunctioning or inaccurate indications are discovered, these indicators shall be identified. A Trouble Report shall be initiated to effect repairs. For indications important to safe and reliable operation, high-priority action shall be initiated to compensate for malfunctioning or inaccurate indications by using alternate instruments or installing approved temporary instruments.
t 3.4.3 When recording a value from a fluctuating instrument (either analog or digital ) for required surveillances, total fluctuation should be evaluated to arrive at an average value. The value shall be determined objectively, without regard to acceptability of the results.
3.5 When un .sual plant conditions are evaluated, review all relevant parameter L Indications so that operating actions are not based solely on one indication.
4.0 . ALARM RESPONSE - CONTROL ROOM 4.1 Respond to alarming annunciators in the following manner:
4.1.1. Scan annunciator panels for flashing windows.
4.1.2. If multip!c windows are flashing, note (in writing if necessary) the
- Illuminated windows before acknowledging the alarms.
4.1.3. Each annunciator that alarms in the Control Room shall be announced by the Control Operator and acknowledged by the US. If applicable, the value of the parameter alarming and its trend should also be reported.
-4.1.4. Communicate ownership of the alarm as necessary to promote efficient N alarm response and acknowledge the annunciator to silence the audible warning.
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('" ') 4.1.5.- The Control Operator will use the Annunciator Response Procedures (ARPs) to determine the necessary corrective actions.
4.1.6. For confirmed emergency alarms, the ARP directs the operator to the 1 appropriate EOP or ONP (during these situations, based on training and knowledge, the operator may have entered the procedure directly). The EOP or ONP are then nsed to direct corrective actions.
This requirement does not apply to the following:
. Expected alarms from surveillance testing or normal system evolutions.
. Recurring common alarms of which the US is already aware and agrees do not need to be announced repeatedly. g
. Multiple alarms that occur during a plant transient will be acknowledged and responded to as determined by the applicable procedures, when plant conditions permit.
4.1.7. Log significant annunciators and actions in the Shift Managers log.
\J' 4.1.8. Announce alarms that indicate a significant equipment failure or entry into a transient procedure.
4.1.9. All reasonable action shall be taken to clear abrming conditions in a timely manner. The number of concurrent evolution = affecting control board indications shall be limited so the operators' ability to detect and respond to abnormal conditions is not compromised.
4.2 During transient conditions, the Operator should not divert his attention from primary control functions to research alarm response unless plant conditions permit or obtaining such information aids the Operator's response. The primary responsibility of Control Operator is to monitor plant parameters. Secondary activities such as preparation of tagging orders, review of procedures, required reading, and review of maintenance work activities shall be limited to as not to interfere with this monitoring.
5.0 ALARM RESPONSE DURING TESTING 5.1 The rosponsible Control Room Operator shall know when alarms will actuate due to testing.
['; 5.2 Both the responsible Operator and the test performer shall jointly and independently v
verify that the respective alarming annunciators to be acknowledged / reset are associated with the respective test.
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1-oM-7.1. RIv. 0 Page 5 of 8 5.3' Control Room Operators should enforce the following requirements:
5.3.1, The test performer should not impair the Operator's communication pathway (i.e., test performer wears headset over one ear only, etc.).
5.3.2. Non-Operations personnel performing tests in the Control Room shall:
- a. Discuss expected annunciator response and request permission for the acknowledgment / reset of CR annunciators prior to the commencement of the respective test.
- b. Receive verbal concurrence from the responsible Operator prior to any respective test manipulations resulting in an RPS ' actuation (i.e., causing a half scram),
- c. Communicate impending alarms immediately prior to (preferred) or coincident with (acceptable) annunciator alarm receipt associated with the respective surveillance tests, d .- Receive concurrence from the responsible Operator prior to the acknowledgment / reset of any CR annunciator, v e. Inform the responsible Operator of alarming annunciators not associated with the respective test. Testing shall not continue until authorized by the responsible Operator,
- f. Inform the responsible Operator of any annunciators not associated with the respective test which clear during associated resets.
- 6.0 ALARM RESPONSE - LOCAL PANEL / EQUIPMENT 6.1 An Operator'who responds at the local panel should take action in accordance with the appropriate ARP or by following instructions from the CR.
6.1.1 Unless the CR instructs otherwise, the Operator shall remain at the local panel / equipment until the alarm has cleared.
1.2 ' The Operator.who acknowledges the local alarm shall notify the CR Operator which local alarm actuated and the response taken. /
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V 6.3 The responsible CR Operator may grant permission for the acknowledgment / reset of local panet/ equipment annunciators to non-Operations personnel. The CR Operator shall ensure that non-Operations personnel are aware of the following requirements as appropriate.
6.3.1 Non-Operations personnel acknowledging / resetting local panet/ equipment annunciators shall:
- a. Discuss expected annunciator response with and request permission for the acknowledgment / reset of local panel / equipment annunciators from the responsible CR Operator before starting the respective evolution. The applicable Plant Equipment Operator should be included in this discussion.
- b. Inform the responsible CR Operator of alarming annunciators not associated with the respective evolution. The evolution shall not continue until authorized by the responsible CR Operator,
- c. Inform the responsible CR Operator of any annunciators not associated with the respective evolution that clear during associated resets.
7.0 NUISANCE ALARMS 7.1 Occasionally alarms sctuate repeatedly (nuisance alarms) for conditions known and understood by Operators.
7.2 Nuisance alarms are an Operator distraction.
7.2.1 Efforts should be taken to reduce or eliminate nuisance alarms.
7.2.2 The first and preferred remedial action is to eliminate the source of the alarm signal by operational or maintenance actions.
7.3 If operational or maintenance correction actions are ineffective-short term, consider bypassing the annunciator in accordance with WC-10, 8.0 NUISANCE ALARMS - PROCESS COMPUTER 8.1 For audible Process Computer nuisance alarms where operational or maintenance corrective actions are ineffective, contact Computer Services to disable printing of computer point for duration of signal.
) 8.1.1 Obtain the Shift Manager's permission prior to deleting the alarm.
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, Page 7 of 6 g 9.0 SINGLE INPUT FAILURES OF MULTI INPUT ANNUNCIATORS NOTE: Some annunciator alarms actuate by multiple inputs. For example, an annunciator may alarm if any one of its inputs exceeds the alarm setpoint. If one of the inputs fails or alarms continuously, the other inputs will be masked.
9.1 If an alarm input fails, the Operator should: ,
9.1.1. Initiate a TR and other actions as necessary.
. 9.1.2. Initiate action to disable the input signal (i.e., Jumper Bypass, Clearance)if it appears the problem may NOT be corrected near term (nominally 24 hrs.).
9.2 If an alarm input actuates repeatedly (nuisance alarm), and becomes an Operator distraction, Shift Management should:
9.2.1. Consider disabling the annunciator (i.e. Jumper Bypass).
NOTE: Disabling the annunciator masks the other unaffected inputs.
g 9.2.2. Take action to compensate for the other masked inputs as necessary (i.e.,
increased monitoring).
10.0 CONTROL ROOM PANEL LABELING (INCLUDING ANNUNCIATORS) 10.1 The Regulatory Guide 1.97 Type "A" instrumentation are those control panci instruments qualified for the post accident harsh environments. The purpose of identifying these instruments is for operator information. If during an accident / abnormal situation a control panel instrument is believed to be giving erroneous information, then the operator can locate and utilize a Reg. Guide 1.97 identified (green bordered) instrument for more reliable / qualified information of that parameter.
As is our normal practice we will continue to operate with sound judgement and belief in all of our normal and functioning instrumentation in the plant and take action according to our approved procedures as plant conditions indicate.
10.2 Annunciator window colors shall be as follows:
10.2.1 Red annunciators denote a Reactor Scram Signal, Setpoint Information and g Extreme Conseanence Status L!ghts.
10.2.2 Blue annunciators denote a System Group Isolation Related Annunciator.
10.2.3 Orange annunciators denote a Significant Condition or Abnormal Event.
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10.2.4 Vialet annunciators denote Plant and offsite Radiation Alarms.
10.2.5 Grenn annunciators doncte those that are in the alarm state at normal, 100% operation.
10.2.6 Annunciators that indicate both a Scram and an Isolation Function will illuminate as a dual color, with Red on the right and Blue on the left.
10.2.7 Annunciator windows with yellow and black diagonal boarders alert the operators to entry conditions for Emergency Operating Procedures.
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