ML20073K176

Notifies That Licensee Response to NUREG-0737,Item III.D.3.4, Control Room Habitability, Meets Requirements of SRP & GDC 4 & 19

ML20073K176
Person / Time
Site:	Monticello
Issue date:	03/25/1983
From:	Murphy D Battelle Memorial Institute, PACIFIC NORTHWEST NATION
To:	Hulman L Office of Nuclear Reactor Regulation
Shared Package
ML112991056	List: ML20073K176
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM NUDOCS 8304200011
Download: ML20073K176 (2)

Text

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OBallelle Paciht Northwest Laboratones P.O. Uca 999 Rkh!and. mshington U.S.A. 99332 Telephone 45C9s T*x is-mn 376-5417 March 25, 1982

. L. G. Hulman, Chief Accident Evaluation Branch Division of Systems Integrat. ion Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Hulman:

FIN NO. B2323 TMI ACTION PLAN: III.D.3.4 CONTROL ROOM HABITABILITY EVALUATION M0flTICELLO NUCLEAR GENERATING PLANT NORTHERN STATES POWER COMPANY DOCKET NO. 50-263 Based upon Pill review of the information 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) 4 and 19.

The conclusions are based on the present plant system and presumes imple-mentation of effective modifications addressed by the licensee and incorporation of the recommendations of this evaluation.

The licensee study concluded that ammonia, hydrochloric acid and hydrogen sulfide represent the primary off-site threat, and chlorine represents the only on-site hazard to control room habitability. Section 7.0 RECOMMENDATIONS of the study indicates the need to monitor these chemicals and to provide control room isolation such that isolation time will allow at least two minutes until the Short Term Exposure Limit (STEL) values are reached. This indicates that control room personnel would need to don Self-Contained Breathing Apparati (SCBA) in order to maintain the control room. SCBA units should be available for each person required in the control room and, to meet single failure criteria, one additional unit is needed for every three SCBA's needed.

The DBA-radiation doses were based on HVAC system changes and modifications.

The calculated values were within the GDC-19 guidelines. The monitoring for airborne radiation in the outside make-up air should be performed to enable the operators to make necessary decisions concerning HVAC operation modes.

Therefore, based on the submittal, and implementation of the proposecimodi-fications, and incorporation of the above recommendations, we conclude that i the control room habitability system is adequate to provide safe, habitable 8304200011 830406 DR ADDCK 05000263 PDR

L.G. Hulman OBattelle March 25, 1982 Page 2 conditions within the control room under both normal and accident conditions, including less-of-coolant accidents, and that occupancy can be maintained

• under accident conditions. Therefore, the applicant's proposed program meets the criteria identified in Item No. III.D.3.4, " Control Room Habit-

. ability" of NUREG-0737 and is, therefore, acceptable.

Respectfully submitted, (v','

p.

Dennis W. Murphy, Ph.D Senior Research Scientist Dosimetry Technology Section DWM/1sb cc: H.E.P. Krug, NRC T.R. Quay, NRC 1

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