ML20054E075
| ML20054E075 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 11/20/1981 |
| From: | Murphy D Battelle Memorial Institute, PACIFIC NORTHWEST NATION |
| To: | Houston R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20054E073 | List: |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM NUDOCS 8204260105 | |
| Download: ML20054E075 (2) | |
Text
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Pacific Northwest Laborater:en P.O. Bos *19 l
Michland, Washington t.,.s.A. !!332 l
Telephone 15096 l
November 20, 1981 Tes u.m4 376-5417 R. W. Hounon, Chief Acciden+ Evaluation Branch Divir;on of Systems Integration Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comission Washington, DC 20555
Dear Mr. Houston:
TMI ACTION PLAN:
III.D.3.4 CONTROL ROOM HABITABILITY EVALUATION MILLSTONE NUCLEAR POWER STATION, UNIT NO. 1 NORTHEAST NUCLEAR ENERGY COMPANY (NORTHEAST UTILITIES)
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, 5 and 19. The conclusions are based on the present plant systems but presumes implementation of effective HVAC modifications l
addressed by the licensee and incorporation of the recommendations of l'
this evaluation.
The licensee states that major modifications would be necessary to comply with the requirements promulgated by NRC since the Millstone Unit No. I went into operation.
The preliminary control room HVAC modifications (DWG N0 SK-MP-6981-9) show redundant dampers, dual filtration systems and dual heating / cool'ing units. The modification appears to have the necessary features to comply with GDC-19.
The skin and thyroid doses cannot be calculated until the control room
. modifications are finalized; however, the licensee has committed to meeting NRC guidance.
The Millstone Unit No. I submittal identified chlorine as the only toxic chemical / gas that may impact on the habitability of the control room. Chlorine detection is provided at the Unit No.1 air intake structure. At present, the detection of chlorine results in an alarm in the control room and requires operator action to isolate the ventilation system.
The system is being re-evaluated and automatic isolation of the control room should be incorporated into the final modifications.
8204260 10
... Ro W. Houston Page 2 November 20, 1981 OBaffelle
'The licensee states that only 2 self-contained breathing apparati (SCBA) are in the control room with additional air bottles and air packs throughout the plant. The control room should be supplied with one SCBA for each operator and, to meet single-failure criteria, one extra unit must be supplied for each three units needed. Additionally, smoke detection should be incorporated at the control room air intake structure to augment the detection system within the control room.
Based on the submittal, implementation of the licensee's commitments, and incorporation of the above recommendations, we conclude 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 ma.intained under accident conditions without personnel receiving radiation exposures in excess of 5 rem whole body, or its equivalent to any part of the body, for the duration of the accident. 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.
Respectfully submitted, i W5
~
Dennis W. Murphy Senior Research Scientist Dosimetry Technology Section DWM/jkr cc': HEP Krug, NRC TR Quay, NRC l
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