ML16130A150

TMI Fhar Volume 1 (005) Chapter 2

ML16130A150
Person / Time
Site:	Three Mile Island
Issue date:	04/11/2016
From:	Exelon Generation Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML16127A520	List: ML16127A469 ML16127A471 ML16127A474 ML16127A476 ML16127A477 ML16127A479 ML16127A480 ML16127A481 ML16127A483 ML16127A484 ML16127A485 ML16127A486 ML16127A491 ML16127A492 ML16127A493 ML16127A494 ML16127A495 ML16127A496 ML16127A498 ML16127A499 ML16127A500 ML16127A501 ML16127A502 ML16127A503 ML16127A504 ML16127A506 ML16127A507 ML16127A508 ML16127A510 ML16127A511 ML16127A512 ML16127A513 ML16127A514 ML16127A516 ML16127A517 ML16127A518 ML16127A519 ML16127A521 ML16130A150 ML16130A151 ML16130A152 ML16130A153 ML16130A154 ML16130A155 ML16130A156 ML16130A157 ML16130A158 ML16130A159 ML16130A161 ML16130A162 ... further results
References
TMI-16-035
Download: ML16130A150 (20)

Text

2-1fhar2.tmi/Rev.272.0METHODOLOGY-FIRE HAZARDS ANALYSIS AND APPENDIX R EVALUATION2.1IntroductionA major task within the Fire Protection Evaluation program is the Plant Fire HazardsAnalysis Update. This task consists of assessing a postulated fire at any locationwithin TMI-1 based upon the plants updated combustible inventory, comparing thiswith the construction features of the fire area or fire zone boundaries and determiningthe adequacy of the installed fire protection and detection systems available for thatfire area or fire zone.In addition, the objective of the Appendix R Section III.G evaluation is to evaluatewhether a single fire within a fire area or fire zone might jeopardize the capability of theplant to bring the reactor to hot and subsequently cold shutdown. Where a single firemight jeopardize safe reactor shutdown, a modification or compensating feature isprovided to retain safe shutdown capability. This evaluation includes a review of theeffect of fire spread through non-fire rated boundaries.The Plant Fire Hazards Analysis Update includes review of all the modifications in theplant to update the combustible inventory (including characterization, quantity andlocation of combustibles per Appendix R,Section III.K.1-8) and analysis and effectsevaluation, which considers the adequacy of fire protection features that have beeninstalled.This revision addresses requirements of Section III.G., III.J., III.L., and III.O. ofAppendix R, and considers later guidance documents issued by the NRC, includingGeneric Letter 86-10.The Appendix R review was conducted in three stages. During the first stage an in-depth analysis was performed to identify the systems and components required forsafe shutdown and to define the redundancy of equipment. The second stage was todetermine the components and their cables, which required attention with respect tothe Appendix R requirements, and evaluate the need for protection from damagecaused by a fire in a specific plant area. A 100% electrical associated circuit reviewwas made to clear the concern over the effect of associated circuit failure on theshutdown capability. Specific fire protection modifications or compensating featureswere developed and implemented in the third stage to provide protection inaccordance with Appendix R. All three stages involved both an information collectionprocess and the actual evaluation process.

2-1fhar2.tmi/Rev.272.0METHODOLOGY-FIRE HAZARDS ANALYSIS AND APPENDIX R EVALUATION2.1IntroductionA major task within the Fire Protection Evaluation program is the Plant Fire HazardsAnalysis Update. This task consists of assessing a postulated fire at any locationwithin TMI-1 based upon the plants updated combustible inventory, comparing thiswith the construction features of the fire area or fire zone boundaries and determiningthe adequacy of the installed fire protection and detection systems available for thatfire area or fire zone.In addition, the objective of the Appendix R Section III.G evaluation is to evaluatewhether a single fire within a fire area or fire zone might jeopardize the capability of theplant to bring the reactor to hot and subsequently cold shutdown. Where a single firemight jeopardize safe reactor shutdown, a modification or compensating feature isprovided to retain safe shutdown capability. This evaluation includes a review of theeffect of fire spread through non-fire rated boundaries.The Plant Fire Hazards Analysis Update includes review of all the modifications in theplant to update the combustible inventory (including characterization, quantity andlocation of combustibles per Appendix R,Section III.K.1-8) and analysis and effectsevaluation, which considers the adequacy of fire protection features that have beeninstalled.This revision addresses requirements of Section III.G., III.J., III.L., and III.O. ofAppendix R, and considers later guidance documents issued by the NRC, includingGeneric Letter 86-10.The Appendix R review was conducted in three stages. During the first stage an in-depth analysis was performed to identify the systems and components required forsafe shutdown and to define the redundancy of equipment. The second stage was todetermine the components and their cables, which required attention with respect tothe Appendix R requirements, and evaluate the need for protection from damagecaused by a fire in a specific plant area. A 100% electrical associated circuit reviewwas made to clear the concern over the effect of associated circuit failure on theshutdown capability. Specific fire protection modifications or compensating featureswere developed and implemented in the third stage to provide protection inaccordance with Appendix R. All three stages involved both an information collectionprocess and the actual evaluation process.