1 / 25

CRDR 1-2-0460 TCS# 92-1756

This text discusses various equipment calibration issues, including wear on potentiometers and failures in transmitters and positioners. It also suggests methods to improve air quality and provides recommendations for equipment maintenance.

bgunther
Download Presentation

CRDR 1-2-0460 TCS# 92-1756

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CRDR 1-2-0460 TCS# 92-1756 A Feedflow recorder in the control room was being calibrated when it was noted that at about 85% indication the pen hunted and oscillated. This was found to be a result of excessive wear on the feedback potentiometer. This wear was caused by the signal (flow) oscillation during normal operation. This oscillation accelerated the wear of the potentiometer. Evaluation of other recorders identified 5 recorders that operate under similar conditions. A step was added to the PM for these recorders to look for points of hunting

  2. II. EER 90-SF-038 A. An unrecognized phenomenon with the Foxboro 2AX+T4 card was discovered. Small output pulses were observed. This phenomenon is a characteristic of this type card This is not an indication of a potential problem or fault. The pulses occur under the following conditions, setpoint at zero and the controller’s low limit at zero. This creates a condition where the controller will go into and come out of limiting as it attempts to respond to the process changes. This can create the output pulses.

  3. III. QIR 85-06 Fire Detector EQID was not adequately verified. No Two Minute Drill, Self Check-Peer Check Incorrect fire detector was heated Deluge system was actuated Main transformer was sprayed down. No damage to the system.

  4. IV. QIR 85-10 Shift change was taking place. The oncomming technician was told the location of the switch. The technician did not verify the FULL instrument number. No Two Minute Drill, Self Check-Peer Check Lead Lifted, Control Room Alarm.

  5. V. SOER 88-01 Instrument air system failures were responsible for 73 reactor trips and 163 LERs over the four year period of 1984-1987 This brings up the need for clean dry air. Areas to control: 1. Dew Point 2. Particulate 3. Oil content D. The following methods should be used to improve air quality: 1. Dryer maintenance 2. Low point blowdowns 3. Preventive maintenance

  6. VI. CRDR1-2-0021 TCS# 92-0744 Fisher model 3570 positioners are mounted on top of piston actuators. The feedback spring for the positioner is connected to the stem of the actuator. For some installation applications an extenstion rod is used to connect the spring to the stem. The vendor literature provides guidance on what size extension rod is to be used for the installation.

  7. VII. TCS 93-0118 Rosemount transmitters have had failures resulting from loss of fill oil. • Indications • Zero shift of the instrument (As Found out of tolerance) • Sluggish Response • Normal response 20% in less than .5 seconds • Sluggish response 20% in more than 5 seconds. • Based on experience as technician, you believe that the transmitter is not operating properly. • Actions • Contact I&C Engineering (Royce Manor) • Write PVAR

  8. VIII. TCS#92-2171 CRDR 9-1-0083 When using a Controllatron and the Utrasonic Couplant, it was found that the couplant had dried out. When used for long peroids of time or on hot systems, Molykote 41 is found to be a good alternative to the couplant.

  9. Determine whether ERFDADS is talking to QSPDS QSPDS CM 2883135 was generated due to a U3 B ERFDADS point not responding during an ST. The fact the data link was down during the ST performance was discovered 15 days later at the expense of approximately 3 to 5 man-hours for discovery. Reperformance of the ST is required to obtain the data at the expense of additional man-hours - guesstimated to be approximately 4 man-hours. In the interest of "Communicate, communicate, communicate", as delineated under "Standards" by "Personal Accountabilitesand Responsibilities" within the Palo Verde "Standards & Expectations Preventing Events" handbook on page 18, I suggest…

  10. Determine whether ERFDADS is talking to QSPDS Continued • 1) Provide training to I&C personnel on how to determine from an ERFDADS terminal whether the QSPDS data link is good or not. • Process involves (screenshots included as Attached Media): • - Go to "TOP MENU" • - Click on "SYSTEM FUNCTION DISPLAYS" • - Click on "SYSTEM HEALTH" • - Click on "EXT. INT. HEALTH" (in lower left corner of "SYSTEM HEALTH" screen) • - If QSPDS-ERFDADS data link is good, then "GENERAL COMM ERROR" indicates "NO". • - If QSPDS-ERFDADS data link is bad, then "GENERAL COMM ERROR" indicates "YES". • - If "YES" is indicated, contact OCS.

  11. Determine whether ERFDADS is talking to QSPDS Continued 2) Determine whether process above should be added to procedures that utilize the QSPDS-ERFDADS data link - perhaps as a prerequisite to testing, or instructions as a Contingency.

  12. How to tell if ERFDADS – QSPDS link is working - Go to "TOP MENU" - Click on "SYSTEM FUNCTION DISPLAYS" - Click on "SYSTEM HEALTH" - Click on "EXT. INT. HEALTH" (in lower left corner of "SYSTEM HEALTH" screen) - If QSPDS-ERFDADS data link is good, then "GENERAL COMM ERROR" indicates "NO". - If QSPDS-ERFDADS data link is bad, then "GENERAL COMM ERROR" indicates "YES". - If "YES" is indicated, contact OCS.

  13. Ex: 36MT-9RC01 2.2.7 requirements to cycle M/A push buttons during calibration. Step 4.5.2.4 Cycle A/M push button 10 times to clean contacts.

  14. X. CRAI: 3190915 SOER 97-1 DISCUSS SOER 97-1, POTENTIAL LOSS OF HIGH PRESSURE INJECTION AND CHARGING CAPABILITY FROM GAS INTRUSION EXECUTIVE SUMMARY: This Significant Operating Experience Report (SOER) informs industry personnel of the potential to gas bind pumps providing safety injection or boron injection functions. Several gas intrusion events resulted from level instrument failures in tanks that provide a water source for these systems.

  15. X. CRAI: 3190915 SOER 97-1 DISCUSS SOER 97-1, POTENTIAL LOSS OF HIGH PRESSURE INJECTION AND CHARGING CAPABILITY FROM GAS INTRUSION EXECUTIVE SUMMARY: The SOER also describes additional design, operating, and maintenance issues, other than level transmitter failures, that have resulted in more than 20 actual or potential gas intrusion events since 1982. The primary causes of gas binding in pumps are (1) design deficiencies, (2) operating deficiencies, and (3) maintenance deficiencies.

  16. Recommendations from SOER 97-1 1. Evaluate Instrumentation for the potential of common mode failures that could result in gas binding of the high pressure injection pumps or charging pumps & eliminate single failure vulnerabilities. 2. Identify the possible gas intrusion pathways in the high pressure injection, charging, and reactor coolant makeup systems.

  17. Recommendations from SOER 97-1 3. Verify that applicable station operating procedures, test procedures, and maintenance procedures provide guidance regarding activities that could contribute to gas intrusion into the high pressure injection pumps or charging pumps. 4.Provide initial and continuing training for station personnel who design, operate, or maintain systems and components that are susceptible to, or may cause, gas intrusion (classroom and/or simulator training). This training includes gas intrusion events such as those described in SOER 97-1.

More Related