ML20041E627
| ML20041E627 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/04/1982 |
| 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 82-051, 82-51, NUDOCS 8203110191 | |
| Download: ML20041E627 (2) | |
Text
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _.
GPU Nuclear h
g g{
P.O. Box 480 Middletown, Pennsylvania 17057 717-944-7621 Writer's Direct Dial Number:
March 4, 1982 82-051
,g C
DD office of Nuclear Reactor Regulation 4
${
operating Reactors Branch No. 4
' g % o f*
Attn: John F. Stolz, Chief
]
U. S. Nuclear Regulatory Commission p
Washington, D.C.
20555
.s
</
g
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)
As discussed in our previous submittal (November 9,1981, L1L 323), this letter was to submit additional evaluations addressing the correction of variances in the Control Building Ventilation System (CEVS) for the requirements of NUREG 0737.
Ilowever, preliminary calculations that were performed to determine the airborne radiation exposure to control room personnel, although conser-vative, did not reflect realistic meterological conditions. They assumed that the radioiodine plume remained stationary over the air intake tunnel for duration of the accident. We plan, therefore, to conduct further evaluations of airborne radiological exposure consistant with realistic meterological conditions. This evaluation will identify those areas, if any, where changes need to be made to achieve dose and radiological air quality consistent with regulatery guidelines.
In addition to chlorine, carbon dioxide and ammonium hydroxide have been preliminarily identified as being potential onsite habitability hazarda.
This is based on the quantity of each substance stored onsite and its toxicity limit. The storage method and location of each of these gases with respect to the control room along with other factors, will be evaluated further in order to determine the actual onsite hazard to control room habitability.
c* m g
With respect to chlorine, our inventory is stored at the locations listed me below:
oo ruo p
20
- River water chlorination house (TMI-1) 3 U
- Circulating vater chlorination houses (TMI-l&2) gg D
Duc
-o Q
At each of these locations the chlorine supply is contained in concrete
-a c block enclosures. The integrity of these atructures may be sufficient aom No mu GPU Nuclear is a part of the General Pubhc UtMties System J
Mr. John F. Stolz 82-051 to contain the gas after a postulated release, substantially reducing the potential habitability hazard. Our evaluation of a postulated chlorine release will address the adequacy of these structures and their resultant impact on actual habitability hazard to control room personnel.
d The results of our evaluation of airborne radiation exposure, and postulated toxic gas releases (chlorine, carbon dioxide and ammonium hydroxide) to control room person,el will be provided by June 30, 1982.
Sincerely, h D.
I ill Director, TMI-l llDll: CJS : vj f cc:
R. Jacobs L. Barrett
____ _______