ML20093C043

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Notifies That Upon Implementation of Mods to Control Bldg Ventilation Sys Program Will Meet Criteria Identified in NUREG-0737 Item III.D.3.4, Control Room Habitability. Mods Include Addition of Redundant Low Leakage Dampers
ML20093C043
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 02/19/1982
From: Murphy D
Battelle Memorial Institute, PACIFIC NORTHWEST NATION
To: Hulman L
Office of Nuclear Reactor Regulation
Shared Package
ML20093C045 List:
References
RTR-NUREG-0660, RTR-NUREG-0737, RTR-NUREG-660, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM NUDOCS 8203020635
Download: ML20093C043 (2)


Text

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QBattelle Pacific Northwest Laboratories P.O. Box 999 Richland, Washington U.S.A. 99352 Telephone (509)

Telex 15 2874 February 19, 1982

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'l L. G. Hulman, Chief 4 -

Accident Evaluation Branch e v4 Division of Systems Integration _

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Office of Nuclear Reactor Regulation Aef 'l

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U.S. Nuclear Regulatory Comission 2' /

Washington, D.C. 20555 Ay:/,', % .'

Dear Mr. Hulman:

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TMI ACTION PLAN: III.D.3.4 CONTROL ROOM HABITABILITY THREE MILE ISLAND NUCLEAR STATION, UNIT-1 NETRUPUL11 AN EDISON COMPANY Based upon PNL review of the infonnation submitted by the licensee in response to NUREG-0660, NUREG-0737, and other NRC Guidance,.the control room meets the requirements of SRP 2.2.1 - 2.2.2, 2.2.3, and 6.4; and therefore meets the requirements of General Design Criteria (GDC) 3, 4, and 19. The conclusions are based on the present plant system and presumes implementation of effective HVAC modifications addressed by the licensee and incorporation of the ,recomendations of this evaluation.

The licensee has comitted to the modification of the existing Control Building Ventilation System (CBVS). The modifications include the addition of redundant low leakage dampers on the outside air intake, exhaust air outlet, and the 306' - 0" elevation of the control building.

Although no values were provided, the licensee has comitted to designing the CBVS to meet the intent of General Design Criterion 19 for maintaining occupancy of the control room.

The licensee has comitted to the installation of a quick-acting toxic gas detector system (including chlorine). The licensee should ensure that the modifications maintain adequate smoke detection for sources internal and external to the control room.

The licensee states that 5 self-contained breathing apparati (SCBA) are available in the control room for 3 to 5 operators under normal 03 operating conditions. If a complement of five persons are required K05 in the control room during a working shift, then an additional SCBA is needed to meet single failure criteria.

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. . L. G. Hulman roary 19,1982 Omme Based on the submittals, implementation of the licensee's modifications, and incorporation of the above recomendations, PNL concludes that the control room habitability systems will provide safe, habitable conditions within the control room under both normal and accident conditions, including loss of coolant accidents, and that occupancy can be maintained under accident conditions. Therefore, upon implementation of the modifications, the program will meet the criteria identified in Item No. III.D.3.4, " Control Room Habitability" of NUREG-0737 and is, therefore, acceptable.

Res cctfully submitted, i

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Dennis W. Murphy Wr }

Senior Research Scientist Dosimetry Technology Section DWM/jkr cc: B.L. Grenier, NRC H.E.P. Krug, NRC T.R. Quay, NRC

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