ML20081B784
| ML20081B784 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/02/1984 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM 5211-84-1056, NUDOCS 8403120004 | |
| Download: ML20081B784 (2) | |
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9 GPU Nuclear Corporation g
gf Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057-0191 717 944 7621 TEi.EX 84-2386 Writer's Direct Dial Number:
March 2, 1984 5211-84-2056 l
Office of Nuclear Reactor Regulation Atta: John F. Stolz Operating Reactors Branch No. 4 U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Control Room Habitability (III.D.3.4. NUREG 0737) l Your letter dated December 28, 1983 requested GPUN to reevaluate the res onse s
of NUREG 0737 Item III.D.3.4, which was based on Probabilistic Risk Assessment (PRA) technique, for on-site as well as off-site sources.
NRC agrees with the PRA approach for off-site sources, however, for on-site sources, design basis event protection is required.
In response to the above referenced letter GPUN is planning to use the services of a contractor to reassess the ammonium hydroxide hazard through recalculations using a limited source dose of ammonium hydroxide. GPUN could limit the source dose by providing spill protection or by limiting the total quantity of ammonium hydroxide stored on-site.
In order to elimin-ste chlorine gas as a hazard, GPUN will evaluate the use of alternative biocides in place of chlorine gas for the circulating water treatment system.
Schedule and other considerations may dictate installation of a chlorine detection system as a more viable operation. At the present time, GPUN is also evaluating the need for leak tight dampers for radiation and/or Toxic l
Gas Protection.
I In parrallel with the contractor evaluation, GPUN is funding an effort with Architect / Engineer to provide an estimate and schedule for the engineering, an design and installation of isolation dampers, and Toxic Gas Detection System in the Control Building Ventilation System (CBVS). G?UN will authorize the toxic gas detection systems at a later date if the contractors evaluation concludes that ammonium hydroxide and/or chlorine gas cannot be eliminated as hazards. An accelerated implementation schedule is as follows:
8403120004 840702 DR ADOCK 05000 I O GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation L
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1 A. ' Determine Modification scope April 1984
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- Receivp, NRC Concurrence June 1984
- Award Contracts for detailed Engineering a totan, Mchi'tect Engineer July 1984 J
' Comp 1hte Prelim. Eng.' Design Review Oct.
1984
- 0rder idags Lead Items Dec.
1984 4
. Delivery.Leng Lead Iteqs Aug.
1985
- Issue Eng'incering,packag'e for installation July 1985 m
- Complete Installation
- Dec. 1985 s
- Complete testing %nd turnover to Plant
- Feb. 1986 a
GPUN will revise th.e above implementation pla.1 depenJing on the results of s
. contractors' evaluaticn of toxic, gas hazards.
a-GPUN has already committed in a letter to NRC /tatisd November 9, 1981, to provide an additional self-contained breathing apparatus (SCBA) Unit for every three requide'd.SCBA units placed in the doutrol Room to satisfy the single failure crit cria for breathing air supply equipment.
N Tha.results'of our Fire HazardIAnalyhis and installation modifications under Appendix R will ensure adyquate smohe detection in the Control Room.
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ukill Director, TMI-l HDH:MI:vj f IsN D
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