Letter Sequence Draft RAI |
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MONTHYEARML0704601592007-02-15015 February 2007
Draft RAI Re. RTS and ESFAS Instrumentation Amendment
Project stage: Draft RAI
ML0716505082007-06-18018 June 2007
Request for Additional Information Proposed Amendment on Bypass Test Capability of Certain Instrumentation
Project stage: RAI
ML0722002602007-07-25025 July 2007
Response to Request for Additional Information Regarding Technical Specification Change to Reactor Trip System Instrumentation and Engineered Safety Feature Actuation System Instrumentation
Project stage: Response to RAI
ML0729006352007-10-0909 October 2007
Partial Withdrawal Regarding Technical Specification Change to Reactor Trip System (RTS) Instrumentation and Engineered Safety Feature Actuation System (ESFAS) Instrumentation
Project stage: Other
ML0735204032007-12-17017 December 2007
Technical Specifications, Issuance of Amendment RTS and ESFAS Bypass Testing Capability
Project stage: Approval
ML0732312272007-12-17017 December 2007
License Amendment, Issuance of Amendment RTS and ESFAS Bypass Testing Capability
Project stage: Approval
2007-02-15
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[Table view] |
Text
From: Peter TamTo:Keith Steinmetz; Michael Scarpello; Sue SimpsonDate: 02/15/2007 7:23:54 AM
Subject:
D.C. Cook - Draft RAI re. RTS and ESFAS Instrumentation Amendment (TACMD3159 & MD3160)Keith:
By application dated 9/15/06, you requested an amendment to revise the D. C. Cook TSs toallow reactor trip system (RTS) and engineered safety feature actuation system (ESFAS) instrumentation to be tested in bypass. The staff has performed a review of the application, and has determined that insufficient information was provided as described below.The most notable omission was the lack of information on the changes to the RTS and ESFASsystems to include the bypass capability. Page 5 of the submittal, titled Technical Analysis, states that: "Hardware changes necessary to be made to the NIS and Foxboro analog/digital protection system to facilitate testing in bypass will be implemented in accordance with 10 CFR 50.59." Standard Review Plan, Chapter 7, states that the review should include an evaluation of the protection system design against the requirements of ANSI/IEEE Std 279, or Reg. Guide 1.153, which endorses IEEE Std. 603, depending upon the applicant/licensees commitment regarding design criteria. The RTS review should address all topics identified as applicable by Table 7-1. Major design considerations that should be emphasized in the review of the RTS are: Design basis Single failure criterion Quality of components and modules Independence Defense-in-depth and diversity System testing and inoperable surveillance Use of digital systemsSame requirements are also applicable to ESFAS instrumentation. The application does notprovide information showing how the bypass system capability meets all of the above guidance. Also, the application does not state that you have done the failure mode and effects analysis todetermine if the failure of bypass system will not have any impact on accident analyses, or would not create new potential accidents. The current DC Cook licensing basis does not include any mass addition transients or accidents. As such, a change in the ESFAS or RTS system that creates the possibility for an inadvertent injection of water into the reactor coolant system (such as the inadvertent start of a charging pump), would require the licensing basis to include mass addition transients in the DC Cook licensing basis. If the licensing basis did notinclude these transients, neither the licensee nor the NRC could conclude that the proposed change poses no safety concern. There was no discussion on the brand and type of system, or the method used for the qualification of this system.Please call me to set up a conference call to discuss the above with our reviewer Hukam Garg. This e-mail aims solely to prepare you and others for the proposed conference call. It does notformally request for additional information, and it does not convey a formal NRC staff position.CC:Hukam Garg; John Nakoski; William BennettMail Envelope Properties(45D450DA.478 : 12 : 35330)
Subject:
D.C. Cook - Draft RAI re. RTS and ESFAS Instrumentation Amendment(TAC MD3159 & MD3160)
Creation Date02/15/2007 7:23:54 AMFrom: Peter TamCreated By:PST@nrc.govRecipientsActionDate & Timeaep.comTransferred02/15/2007 7:24:37
AM kasteinmetz (Keith Steinmetz) mkscarpello (Michael Scarpello) sdsimpson (Sue Simpson)nrc.gov OWGWPO01.HQGWDO01Delivered02/15/2007 7:24:04
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AM HCG CC (Hukam Garg)Opened02/15/2007 8:37:12
AMnrc.gov TWGWPO01.HQGWDO01Delivered02/15/2007 7:24:05
AM JAN1 CC (John Nakoski)Opened02/15/2007 7:33:20
AMPost Office DeliveredRouteaep.com OWGWPO01.HQGWDO0102/15/2007 7:24:04 AMnrc.gov OWGWPO02.HQGWDO0102/15/2007 7:24:04 AMnrc.gov TWGWPO01.HQGWDO0102/15/2007 7:24:05 AMnrc.govFilesSizeDate & Time MESSAGE527602/15/2007 7:23:54 AMOptions Auto Delete:
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