- 0PGP03-ZO-0022, Post-Trip Review*
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Category 1 Reactor Trip
The cause of the trip has been identified and safety-related equipment functioned properly.
- 0PGP03-ZO-0022, Post-Trip Review*
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Category 2 Reactor Trip
The cause of the trip has been identified.
Some safety-related equipment may not have functioned properly.
The cause of the malfunctioning safety-related equipment has been identified.
- 0PGP03-ZO-0022, Post-Trip Review*
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Category 3 Reactor Trip
The cause of the trip is unknown, or safety-related equipment did not function properly and the cause is indeterminate (cause of malfunction is unknown, thus cannot be corrected).
- 0PGP03-ZO-0022, Post-Trip Review*
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Purpose and Scope
Actions to be taken following reactor trips to ensure full understanding of:
- The cause of the trip
- The plant transient behavior before and after the trip
- The trip’s impact on nuclear safety, power production, and equipment performance
And identify necessary corrective action.
In addition, this procedure prescribes the criteria that must be satisfied prior to restarting the unit.
- 0PGP03-ZO-0022, Post-Trip Review*
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Who is responsible for performing the post-trip review investigation to determine the cause of the trip, evaluating plant response, and determining the category of the trip.
STA
- 0PGP03-ZO-0022, Post-Trip Review*
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Who is responsible for reviewing the Post-Trip Review Report ?
The Plant Operations Review Committee (PORC).
•This review is required prior to unit restart following Category 3 trips.
- 0PGP03-ZO-0022, Post-Trip Review*
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Who is responsible for authorizing restart following a trip ?
Category 1 and 2 - Plant Manager based on Shift Manager recommendation
Category 3 - after reviewing post-trip report and considering the recommendations of the Shift Manager and PORC.
- 0PGP03-ZO-0022, Post-Trip Review*
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Requirements for Restart after Category 3 Trip
- PORC has reviewed Post-Trip Review Report
- Identified corrective actions have been or will be completed when conditions permit (for the cause of the Rx Trip AND any ESF system failures)
- Plant response has been analyzed and was as expected or any issues do not impact safe operation of the plant
- 0PGP03-ZO-0003, Temporary Modifications*
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Types of T-Mods
T-MODS to SSCs within STPEGS Configuration Management Program.
T-MODs used to track temporary leak repairs. (Only required if:)
- P&ID change required (except valve kill / packing injection)
- Procedure change required
- CROE required
- Training required
- 0PGP03-ZO-0003, Temporary Modifications*
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SRO Responsibilities for T-Mods
- Review T-MOD for completeness and compatibility with expected plant conditions.
- Ensure any procedure changes / training required prior to T-MOD start is complete
- Add new T-MODs to shift turnover checklist when needed
- Accepting T-MOD installation / restoration by signature
- 0PGP03-ZO-0003, Temporary Modifications*
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Procedure Group responsibilities for T-Mods
- Review for impact on plant equipment and determine that adequate precautions are included in the T-MOD package.
- Initiate any needed procedure revisions, field changes, or temp procedures. (CR)
- Determine if a CROE is required (with mgmt.)
- Determine required training (with mgmt. and training)
- 0PGP03-ZO-0003, Temporary Modifications*
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Work Start Authority responsibilities for T-Mods
•Maintain the TCC Log current and provide status reports as required.
- 0PGP03-ZO-0003, Temporary Modifications*
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Examples that do NOT require a T-Mod
- The removal of normally installed pipe caps, plugs, or blind flanges downstream of isolation valves
- Temporary alterations to plant SSCs required in the course of performing work tasks under open work control documents
- Providing temporary power for testing of equipment which is NOT in service (including PMT)
- Monitoring and troubleshooting ARE NOT governed by this procedure. This includes the installation of test and/or monitoring or recording instrumentation.
