ML20117L164
| ML20117L164 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/06/1996 |
| From: | Ohanlon J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 96-375, NUDOCS 9609130007 | |
| Download: ML20117L164 (4) | |
Text
s VINGINIA ELECTHIC AND POWl;R COMI ANY nIcunoxI),VIHOINIA 23261 September 6,1996 United States Nuclear Regulatory Commission Serial No.96-375 Attention: Document Control Desk NL&OS/ETS R3 Washington, D. C. 20555 Docket Nos.
50-338 50-339 License Nos.
NPF-4 NPF-7 4
Gentlemen:
VIRGINIA ELECTRIC AND POWER COMPANY RORTH ANNA POWER STATION UNITS 1 AND 2 CORRECTIVE ACTIONS UPDATE FOR NOTICE OF VIOLATIONS This letter provides an update on actions we've taken to improve our performance in response to the violations received during the current SALP period. These additional enhancements are summarized in the attachment to this letter. No new commitments are intended as a result of this letter, if you have any questions or require additional information, please contact us.
Very truly yours, p
James P. O'Hanlon Senior Vice President - Nuclear Attachment cc:
Document Control Desk United States Nuclear Regulatory Commission M C/
Washington, D.C. 20555 Mr. R. D. McWhorter Senior Resident inspector North Anna Power Station
.96o9130007 960906 PDR ADOCK 05000338 G
PERFORMANCE ENHANCEMENTS FOR VIOLATIONS IDENTIFIED DURING THE CURRENT SALP PERIOD IR 95-04-02: Engineering Evaluatten - Heatup and Cooldown of Pressurizer The overcooling event was reevaluated by engineering and Westinghouse and determined to have no detrimental effect on the fracture toughness of the pressurizer. However, to precluCe further thermal stress of the pressurizer due to overcooling, Unit 1 and 2 pro:edures were revised to add a precaution and limitation for the operator at the controls to periodically monitor pressurizer level and maintain level at or below initial level to minimize cooldown during the Safety injection Functional Testing.
It should be noted that there have been no subsequent heatup/cooldown events during these tests since the procedural precautions have been added.
The generic implications of heatup and cooldown transients are being evaluated by the Westinghouse Owners Group (WOG). The WOG is currently collecting data on pressurizer heatup and cooldown rates at three test plants. As part of this study, these plants are using Westinghouse operating strategies developed to mitigate these transients. Following issuance, the WCAP will be reviewed for applicability and possible operational / procedural enhancements.
W O G is currently scheduled to publish a WCAP on this subject in the late summer of 1996.
IR 95-11-02: Ultrasonic Examination of ISI Steam Generator Welds i
To prevent reoccurrence of the use of incorrect calibration blocks, Non Destructive Examination (NDE) procedures for Units 1 and 2 were enhanced to specify that during the examination the back surface reflection should be observed to ensure that the calibrated sweep is adequate to encompass the component thickness. In addition, previous steam generator NDE examinations were reviewed. Five sets of examinations that were reviewed were identified as having UT test equipment that was calibrated for a material thickness that may have been less than the actual material on the upper head to shell welds. These five sets were reexamined during the 1996 Unit 1 refueling outage. These reexaminations did not reveal any unacceptable conditions or indications.
IR 95-15-02: Design Change Review As a method to discuss the MOV mis-wiring event, a Human Performance (Stop Work) Focus Day was conducted to provide all station employees a discussion on quality and to convey station management's expectations on personnel performance.
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In addition, the Root Cause Evaluation (RCE) of this event included the following corrective actions: 1)providing additional training to personnel on the use and capability of Document Management Information System (DMIS), 2) and enhancing the ease of use of DMIS. The following enhancements were made to DIMS: An icon has been created that navigates the user directly to a new more user-friendly document search panel. An additional selection panel was created l
that works in conjunction with the new search panel and " flags" the document if a pending change exists. When attempting to retrieve a document that has a pending change, the change information must be reviewed prior to allowing the user to continue with the document retrieval. As changes occur, information is deleted from the pending changes panel as appropriate.
IR 95-20-02: Air Lock Outer Door Rendered inoperable by Open Test Connection Even though the cause of the violation was attributed to an inadequate procedure, a Root Cause Evaluation was subsequently initiated by the Human Performance Enhancement System Coordinator to assess this event. As a result, several recommendations were implemented to enhance human performance. The Operations standard " Briefs" was updated to describe the methodology by which off-shift personnel are controlled. A copy of the standard was provided to each Shift Supervisor, the Operations Maintenance Advisor, 1
Supervisor Shift Operations and Supervisor Operations Support to review with personnel under their supervision. The revised standard was also placed in Operations Required Reading.
The Superintendent Operations reviewed the event, proper command and control protocol and the importance of supervisory oversight during LORP sessions.
IR 96-03-02: Reinstallation of Interfering Equipment Following Design Changes A field inspection was performed by engineering on the loop flow transmitter tubing in each of the three loop rooms and a second inspection was performed by an engineering mechanics stress analyst. The original instrument tubing support configuration was confirmed to be adequate. However, for certain tubing runs additional supports and/or modification of existing supports were identified as desirable for providing greater confidence in the seismic integrity of the tubing. Applicable repairs and restoration of the seismic integrity of the loop flow transmitter tubing were completed in accordance with the design change program.
Enhancements to the work procedures were made to ensure safety related seismic supports and hangers are tracked during design changes or maintenance.
To better control the removal and re-installation of hangers, supports, restraints, etc. that interfere with design change activities, the existing
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- procedures were enhanced. The implementing procedures include steps to require verification of proper re-assembly of interferences. In addition, a control j
form has been developed and is now included in work packages to control the j
removal and re-installation of hangers, supports, restraints, etc. that interfere with maintenance activities.
Engineering personnel performed plant walkdowns to identify discrepancies with 3
hangers, restraints, supports, anchors, etc. As a result of these walkdowns, several discrepancies were identified. These discrepancies are being corrected 4
by the maintenance work processes.
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[fL96-03-03: Mode Changes with inoperable Eauipment l
Although the mode change with an inoperable heat trace circuit was attributed to i
personnel error, a Root Cause Evaluation was conducted and the following l
enhancements have been or are being considered for implementation.
Alarm Response procedures for local annunciators have been put in 3-ring binders and stored in a magnetic tray, attached to the associated cabinets.
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Operations personnel were coached to perform a detailed review of Technical l-Specifications to ensure all limiting conditions of operation are identified and appropriately tracked.
5 The safety related work order review process is being revised to specify what is expected of each department reviewing the open safety related work orders and j
that independent reviews will be completed to ensure accuracy, i
j The Operations Shift Supervisor, Operations Maintenance Advisor or individuals i-delegated by the Superintendent Operations are the individuals responsible for reviewing and approving corrective maintenance work requests.
These individuals are responsible for identifying Technical Specification Limiting Conditions for Operation, and ensuring unit conditions are appropriate to perform l
maintenance activities.
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