ML18096B028
| ML18096B028 | |
| Person / Time | |
|---|---|
| Site: | Salem, Hope Creek  |
| Issue date: | 10/01/1992 |
| From: | Labruna S Public Service Enterprise Group |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLR-N92099, NUDOCS 9210090320 | |
| Download: ML18096B028 (4) | |
Text
Public Service Electric and Gas Company Stanley LaBruna Public Service Electric and Gas Company P.O. Box 236, Hancocks Bridge, NJ 08038 609-339-1200 Vice President - Nuclear Operations OCT 0 1 1992 NLR-N92099 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 Gentlemen:
EVALUATION OF ADDITIONAL HAZARDOUS CHEMICAL POSTULATED ACCIDENTS AND THEIR IMPACT ON CONTROL ROOM HABITABILITY SALEM AND HOPE CREEK GENERATING STATIONS DOCKET NOS. 50-272, 50-311, 50-354 Public Service Electric and Gas (PSE&G) has completed the safety evaluations of the additional chemicals, hydrazine anq sodium hydroxide, in accordance with our transmittal dated December 30, 1991 (NLR-N91216).
The updates of the Salem and Hope Creek UFSAR's, for the additional hazardous chemicals including ammonium hydroxide,_have been approved and will be incorporated in the next scheduled revision update.
Other potentially hazardous chemicals were identified as being stored and delivered to the site.
However, upon further consideration of the potential hazards and the criteria of Regulatory Guide 1.78, only hydrazine and sodium hydroxide were determined to constitute a potential control room habitability concern.
The safety evaluation and its supporting analysis conclude that a postulated accident to the hydrazine storage tank,
- sodium hydroxide storage tanks, and sodium hydroxide delivery tanker, will not impact control room habitability at Salem and Hope Creek.
The criteria of Regulatory Guide 1.78 and Standard Review Plan sections 2.2.3 and 6.4 was used in the evaluations.
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Document Control Desk NLR-N92099 2
OCT 01 1992 provides a discussion of the control room habitability evaluations for hydrazine and sodium hydroxide.
Should you have any questions in regard to this transmittal, please contact us.
Sincerely, Attachment
Document Control Desk NLR-N92099 3
C Mr. T. T. Martin, Administrator - Region I
- u. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Mr. J. c. Stone, Licensing Project Manager U. s. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852 Ms. A. Keller
- u. s. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852 Mr. T. P. Johnson (S09)
USNRC Senior Resident Inspector Mr. K. Tosch, Chief NJ Department of Environmental Protection Division of Environmental Quality Bureau of Nuclear Engineering CN 415 Trenton, NJ 08625 OCT 0 1 1992
Document Control Desk NLR-N92099 ATTACHMENT 1 Hydrazine is a potentially hazardous chemical which is stored in a 300 gallon tank on elevation 120 feet of the Salem Unit 1 Turbine Building at a concentration of 35 wt.%.
Hydrazine is added to the Condensate System for control of residual oxygen and is described in UFSAR Section 10.3.5.1.
In accordance with Regulatory Guide 1.78, the tank was postulated to fail and the total contents released onto the Turbine Building floor.
Calculation of airborne concentrations for control room habitability evaluations were performed by the computer code "CHARM".
"CHARM" has been validated and verified in accordance with PSE&G software qualification procedures. Assuming worst case conditions, the stored. hydrazine was considered to be at equilibrium temperature with the maximum ambient temperature of the Turbine Building (115 degrees F).
The normal boiling point of the hydrazine solution is 228 degrees F therefore, flashing was not considered.
The spilled hydrazine was assumed to evaporate to the Turbine Building atmosphere and be exhausted vertically to the environment by the Turbine Building upblast roof ventilators.
The released hydrazine contaminated air is dispersed by the atmosphere and assumed to be directed by the wind toward a control room ventilation intake.
Evaluation results in a maximum concentration of hydrazine in the Salem and Hope Creek control rooms that is less than the most stringent limit found in authoritative literature.
Sodium hydroxide is stored in different container quantities at various locations throughout Salem and Hope Creek.
- However, because of sodium hydroxide's physical properties, the storage amount was not a significant factor for the evaluation.
Evaluation of sodium hydroxide physical properties at its maximum stored concentration of 50 wt.% indicated that it would not form a gas under any worst case accident conditions.
Upon a postulated release of 50 wt.% sodium hydroxide solution, some fumes may form locally at the release area however, its physical<
properties preclude the formation of a gaseous plume that would be exhausted to the environment and disperse to the control room.
The boiling point of 50 wt.% sodium hydroxide is 284 degrees F and when subjected to high temperatures, only water evaporates leaving behind a solid residue.
Therefore, a postulated release of sodium hydroxide from either a storage tank or delivery tanker, was qualitatively determined not to impact control room habitability because there is no credible mechanism for toxic gas formation and dispersal to the control room.