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MONTHYEARML19319C2211976-12-15015 December 1976
Notifies of Results of NRC 761006-08 Site Visit.Requires Mod of Reactor Coolant Flow Parameters to Meet Single Failure Criterion to Preclude Loss of Reactor Coolant Flow/Axial Power Protection.Response Required in 15 Days
Project stage: Other
ML19319C2281977-01-0505 January 1977
Responds to NRC Re Reactor Coolant Flow Monitoring.Requests Addl 45 Days to Submit Design Mod & Installation Schedule
Project stage: Other
ML19319B9721977-02-25025 February 1977
Notifies That Resolution of Reactor Coolant Flow Monitoring Will Be Scheduled After Meeting W/Nrc to Clarify Scope of Problem
Project stage: Meeting
ML19276F6731979-03-15015 March 1979
Requests to Be Notified of Util Intentions Re Mod to Reactor Coolant Sys Flow Indication.Nrc Feels Installation of Redundant Set of Sensing Lines for Each Reactor Coolant Loop Is Acceptable
Project stage: Other
ML19274E8011979-04-17017 April 1979
Ack Re Reactor Coolant Sys Flow Instrumentation. Review Is in Progress & Expected to Be Complete by 790503
Project stage: Other
ML19263E7681979-05-11011 May 1979
Responds to Re Proposed Mods to Reactor Coolant Flow Sensing Sys.Forwards Safety Evaluation Mods.Mods Must Be Implemented Prior to Restart from Current Refueling Outage
Project stage: Approval
ML19263E7701979-05-11011 May 1979
Safety Evaluation Supporting Mod of Design of Redundant Instrument Sensing Lines for Reactor Coolant Flow
Project stage: Approval
ML19326E0071980-07-21021 July 1980
Informs That Util Modifying Current RCS Flow Indication Scheme in Manner Similar to NRC Acceptable Method.Effort Will Be Completed Prior to Startup Following Current Refueling Outage
Project stage: Other
ML19330B9821980-08-0404 August 1980
Forwards Addl Info Re Reactor Coolant Loop Flow Indicators, Per 800730 Discussion.Notes Error in 800721 Response. Correct Min Separation for New Sensing Lines Should Be 3 Ft
Project stage: Other
ML19344D9191980-08-18018 August 1980
Requests Info by 800825 Re High Energy Line Break Effects on Flow Sensing Lines Inside Secondary Shielding & on Flow Transmitters.Request Prompted by Questions Arising from Review of 800804 Submittal Re RCS Sensing Lines
Project stage: Approval
ML19344E3531980-08-25025 August 1980
Responds to NRC Requesting Discussion of High Energy Line Break Effects on Flow Sensing Lines Inside Secondary Shielding & Flow Transmitter for Redundant RCS Flow Sensing Lines
Project stage: Other
1979-04-17
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Text
muco Docket No. 50-346
% EDISON License No. NPF-3 A.Can0 P CAoAE Serial No. 646 (ylJ**'
A191253-5221 August 25, 1980 Director of Nuclear Reactor Regulation Attention:
Mr. Robert W. Reid, Chief Operating Reactors Branch No. 4 Division of Operating Reactors United States Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Reid:
This is in response to your letter of August 18, 1980 requesting a discussion of the high energy line break effects on: a) the flow sensing lines inside the secondary shielding, and b) the flow transmitters for the redundant Reactor Coolant System (RCS) flow sensing lines at Davis-Besse Nuclear Power Station, Unit 1.
We have reviewed the pipe routing for these flow sensing lines and transmitters in light af high energy pipe breaks.
Excluding the RCS, it has been determined that sufficient separation exists between the flow sensing lines and flow transmitters and all high energy piping systems. For breaks in the RCS, operability of these flow sensing lines. and the transmitters is not required since RCS flow is not needed to be input to the Reactor Protection System for this condition.
The flow sensing lines have been routed at the opposite side of the stexn gen-erator from the main steam and feedwater piping inside the secondary shield.
This provides sufficient separation.
Outside the steam generator compartments where the transmitters are located, a concrete floor slab exists between the closest high energy pipe and the transmitters. There are no other high energy piping systems in this area.
Yours very truly, f
7~
RPC:SCJ: sic l
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/D THE TCLECO EDISCN CCMPANY ECISCN PLAZA 300 MACISCN AVENUE TCLECO. CHIO 43552 8008280477
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