ML18102B381
| ML18102B381 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 06/06/1997 |
| From: | Eric Simpson Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LR-N97357, NUDOCS 9706120127 | |
| Download: ML18102B381 (5) | |
Text
Public Service
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- I i Electric and Gas I Company E. C. Simpson Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609-339-1700 Senior Vice President - Nuclear Engineering JUN 6 1991 LR-N97357 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 CABLE RACEWAY FIRE WRAP RESOLUTION PLAN SALEM GENERATING STATION UNIT NOS. 1 AND 2 DOCKET NOS. 50-272 AND 50-311 Ladies and Gentlemen:
On May 19, 1997, Public Service Electric and Gas (PSE&G) provided in letter LR-N97320 an outline of PSE&G's plan to address fire barrier issues.
In recent discussions, the NRC requested.
additional details concerning the scope and schedule of the plan to address the fire barrier issues*.
PSE&G has a project plan to address the fire barrier issue.
Until this plan is implemented, the existing plant fire protection features, and th~ compensatory measures detailed in our May 19, 1997 letter provide an adequate level of protection to comply with the overall fire protection program requirements.
The plan will be implemented in three phases.
Phase 1 of the plan includes a safe shutdown cable re-analysis, Phase 2 is design development, and Phase 3 is design change implementation.
The three phases of the plan are not sequential, but rather, elements of each phase will overlap.
A dedicated team, to be assembled in June 1997, will be responsible for developing the details and implementing this plan.
The team will be led by PSE&G employees, with support from industry experts.
The specification for this outside support is being developed and will be issued in July 1997.
Three different fire wrap materials (i.e., Kaowool, FS-195 and 3M E-50) protect approximately 20,000 linear feet of cable raceways in 28 distinct large fire areas at Salem Units 1 and 2.
Because of maintenance considerations, PSE&G will evaluate the 9706120127 970606 PDR ADOCK 05000272 F
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approximately 500 feet of installed Kaowool with the intent of eliminating the material.
The remaining two materials (FS-195 and E-50) will be reviewed and upgraded as necessary to protect cables that are identified as required to support safe shutdown; however, the safe shutdown cable re-analysis is intended to minimize the number of cables required.for post-fire safe shutdown.
OVERALL SCHEDULE The overall schedule for resolving the cable fire barrier wrap issue is prior to restart from the third refueling outage after restart of each Salem unit.
Based on the current 18 month fuel cycle, this is scheduled for approximately four and one half years from each unit's startup from the current outage.
As explained below, the critical elements are the completion of the safe shutdown cable re-analysis and electrical division outages needed to support the installation of possible design changes.
PSE&G has three trains of vital electrical power at Salem.
During a refueling outage, a vital electrical train is removed from service for maintenance activities.
During this window, modifications to cables powered from that electrical train will be scheduled.
We expect that cables powered from each train could require outage modifications.
Therefore, three refueling outages are required to implement identified modifications.
Phase 1, Engineering Scoping and Evaluation The key element of Phase 1 will be a safe shutdown cable re-analysis.
This phase will also include activities required to identify, document and evaluate the installed fire barrier configurations, installation details and supporting fire test and ampacity derating data.
The safe shutdown cable re-analysis will initially focus on Unit 2, and will envelope much of the analysis needed to complete Unit
- 1.
The safe shutdown cable re-analysis is expected to be completed 18 months from the unit's restart.
The 18 month schedule for Unit 2 is based on using the current safe shutdown analysis as a framework, and four to five weeks of analysis for each of the unit's 14 fire areas.
The Unit 1 analysis will be based on the Unit 2 analysis, and is expected to be completed within 18 months of the Unit 1 restart.
The fire areas at Salem are large and contain multiple trains of equipment to support post-fire safe shutdown.
PSE&G will review the current safe 95-4933
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shutdown analysis to validate the assumptions used in protecting cables and functions.
The re-analysis will include a detailed review of cables in each fire area.
The Individual Plant Evaluation for External Events (IPEEE) will be considered when prioritizing the review of each fire area.
The cable review will be performed on a circuit by circuit basis to identify if an existing cable is required to support safe shutdown, or whether a cable could be re-routed or deleted.
Other Phase 1 activities will be performed in parallel to the cable re-analysis.
Specifically, this will include: 1) a review of drawings, installation documents and walkdowns of installed fire barriers to gather as built data; 2) an assessment of installation details with respect to the installed configurations to confirm that installation details are representative of the installed configurations; and 3) a review of the installation details with respect to applicable testing to confirm that the representative testing is available to support an installed fire barrier.
As specific cables requiring protection are identified by the cable re-analysis, a preliminary resolution strategy will be selected, and the other Phase 1 activities will be completed.
Phase 2 activities for that cable raceway will then begin.
Phase 1 is expected to reduce the number of cables required to support safe shutdown; however, the number of wrapped cable trays containing safe shutdown cables may not be significantly affected.
Identifying the minimum number of cables required to achieve safe shutdown will allow PSE&G to consider various resolution strategies in Phase 2.
Phase 2, Design Change Package Preparation and Resolution of Issues Phase 2 will begin as the re-analysis in Phase 1 identifies a preliminary resolution strategy for specific cable raceways required to support safe shutdown.
The detailed design work to determine if an identified resolution strategy is practicable will be performed in Phase 2.
PSE&G expects that Phase 2 activities will begin about 10 to 12 weeks into the plan, and will continue through to the end of the plan.
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- The expected barrier performance and other factors will be considered in selecting a resolution strategy for each cable raceway.
Among the strategies that will be considered include, re-routing cable, upgrading existing wrap, eliminating wrap, installing a new wrap material, manual actions, exemption requests, or other regulatory relief.
Design change packages will be developed for modifications that are required to support safe shutdown.
For some of these modifications, the design details (e.g., fire tests, ampacity derating factors, seismic supports and loading calculations) may need to be developed.
These design details may impact the preliminary resolution strategy, and Phase 1 activities may be re-visited.
Phase 3, Design Change Implementation PSE&G plans to install necessary design changes over three refueling outage cycles for Unit 2 and Unit 1.
The implementation of the design changes will be divided into outage and non-outage work.
Those changes that can be performed at power will be implemented in accordance with the existing maintenance scheduling program.
A fire risk assessment will be used to prioritize the implementation of non-outage design changes.
Some changes will require a plant outage to install.
The outage work will be scheduled to coincide with electrical division outages, as necessary.
PSE&G intends to provide periodic updates on the progress of the plan.
If you have any questions please contact us.
95-4933
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- Dot!ument Control Desk LR-N97357 5
C Mr. Hubert J. Miller, Administrator - Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. L. N. Olshan, Licensing Project Manager -
Salem U. S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Mail Stop 14E21 Rockville, MD 20852 Mr. C. Marschall -
Salem (X24)
USNRC Senior Resident Inspector Mr. K. Tosch, Manager, IV Bureau of Nuclear Engineering 33 Arctic Parkway CN 415 Trenton, NJ 08625