ML20153C554
| ML20153C554 | |
| Person / Time | |
|---|---|
| Issue date: | 09/17/1998 |
| From: | Beckner W NRC (Affiliation Not Assigned) |
| To: | Adensam E, Boger B, Zwolinski J NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9809240127 | |
| Download: ML20153C554 (4) | |
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fN Sa caco UNITED STATES j
NUCLEAR REGULATORY COMMISSION o
2 WASHINGTON, D.C. 2066G4001 s;'...../
September 17,1998 NOTE TO:
TO THOSE ON ATTACIFD LIST FROM:
William Beckner, TSB, ADPR, NRR
SUBJECT:
ICE CONDENSER TECHNICAL SPECIFICATIONS On September 17,1995, Mr. Lee Keller of Duke Power Company briefly met with me to provide a status ofindustry efforts to update Technical Specifications related to ice condensers.
The utilities that own ice condenser containments are collaborating with assistance from Wutinghouse in tids effort as described in the attached Preliminary work scope provided by Mr.
Keller at the meeting.
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j ADDRESSEES TO NOTE l
B. Boger, ADPR, NRR MS O-14E04 J. Zwolinski, DRPE, NRR MS O-14E04 E. Adensam, DRPW, NRR MS O-13E64 P. Tam - DRPE, NRR MS O.1.4H25 R. Martin, DRPE, NRR MS O-14B21 3
J. Stang, DRPW, NRR MS O-13D01 R. Hernan, DRPE, NRR MS O 14B21 C. Berlinger, DSSA, NRR MS O-08H07 H. Berkow, DRPE, NRR MS O-14H25 M. Reinhart, ADPR, NRR MS O-13H15 R. Giardina, ADPR, NRR MS O-13H15
\\Public Document Room (' D DR) y
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Ice Condenser Technical Specification Revision Project Preliminary Scope Ice Condenser Plini Group AEP e Duke Power. TVA overview:
The three domestic utilities that own ice condenser containments: American Electric Power (D.C. Cook Units 1&2), Duke Power Company (Catawba Units 1&2 and McGuire Units 1&2) and Tennessee Valley Authority (Sequoya Units l&2 and Watts Bar Unit 1) met formally from August 18 to August 20,1998 in Chattanooga, Tennessee for the purpose ofinformation and technology exchange, and to discuss the statut of ice condenser inspections ongoing at each utility by the Nuclear Regulatory Commission. The utility group discussion centered around the current ice condenser design basis and technical specifications and the need for them to be revised, with clearly defined surveillance methodologies and bases. The original technical specifications were written for a system that was in its infancy with respect to actual run time, and over the past twenty or more years of operation much experience and knowledge have been amassed by the owners. Recent events at the Cook Nuclear plant and at Catawba Nuclear Station and a greater movement toward literal compliance have highlighted the need for these technical specifications to be revisited and clarified. The Technical Specification clarification should include the definitions of critical components of the ice condenser system (such as flow channels).
Project Scoor:
It is proposed to separate this project into three tasks:
- Task 1: Review original and current documentation and analyses and clearly define the design basis of the ice condenser; its functions, interactions with other systems, and safety features. Such a design basis would necessarily incorporate any appropriate operating experience from the owners.
Task 2: Review original and current documentation and revise appropriately the Ice Condenser Technical Specifications to provide the owners adequate and clear surveillance requirements and bases to assure operability. The following ice condenser technical specifications are within the scope of this l
project:
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=> Ice CondenserIce Bed Ice Bed Temperature Monitoring System o
=> Ice Condenser Doors Inlet Door Position Monitoring System
=>
=> Ice Condenser Floor Drains included in the revised Ice Condenser Technica! 'fecification bases, as appropriate, will be any I
documentation that has been generated during the operating life of the system, including, but not limited to:
l Definition of detrimental ice basketf.ce basket ring / cruciform damage as it relates to the
=>
original basket configuration, local and cumulative (e.g., dents, tears, missing screws, loss of galvanizing, required quantity and configuration)
Definition of detrimental ice build-up on doors, floor, flow channels, wall panels and ice o
baskets Definition of " fuzzy frott"(non-maintenance related) and build-up tolerances on doors, flow
=>
channels, wall panels, and other appropriate structures
=> Clear definition of the 15% flow channel ice build-up tolerance and use of the 0.38-inch ice build-up limit, and brw they relate to each other
=> Acceptability of freshly blown ice as well as older, compacted ice e
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=> Allowable sublimation height from ice basket bottom such that impact loads from ice drop after a DB A are still bounded Allowable use of" heavy" ice baskets in certain areas of the ice bed
=>
=> Definition of detrimental and acceptable damage to ice condenser doors (inlet doors, intermediate deck doors, and top deck blankets)
Task 2 will generate a clear statement of the Limiting Conditions for Operation and the Surveillance Requirements for each of the Ice Condenser Technical Specifications listed, including:
=> Definitions of components involved in the surveillances
=> Effect of error tolerance on tooling involved in the surveillances, such as spring scales and load cells
=> A clearly worded basis for each of the Ice Condenser Technical Specifications
=> Clarification and discussion of the intent of each Technical Specification basis Igjd: Provide guidance on repair / replacement methodologies for ice condenser components, including all doors, door frames, top deck blankets, floor, floor drains, vent curtain, instrumentation and wall panels.
Each task will generate a r port as its end result, with the final issue of the project (i.e., all three tasks) documented in a WCAP.
Time frame for completing this work (all three tasks)is EOY 1998. Meetings involving appropriate I
representatives from each utility and Westinghouse should be held on a frequency determined by the Ice Condenser Mini Group once the Project Authorization is completed. It is expected that the revised Ice Condenser Technical Specifications will be resubmitted by the license holders upon completion of this project.
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