ML20053C698

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Forwards Response to SER Outstanding Issue 12 Re Transportation Accidents,Per NUREG-0853.Potential Chemical Hazards Eliminated by Utilizing Risk Assessment Methodology
ML20053C698
Person / Time
Site: Clinton Constellation icon.png
Issue date: 05/28/1982
From: Wuller G
ILLINOIS POWER CO.
To: John Miller
Office of Nuclear Reactor Regulation
Shared Package
ML20053C699 List:
References
RTR-NUREG-0853, RTR-NUREG-853 U-0494, U-494, NUDOCS 8206020478
Download: ML20053C698 (2)


Text

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g , h U-0494 ILLIN0/S POWER 00MPANY ygy 730_g2(05 2gy_t 500 SOUTH 27TH STREET, DECATUR, ILLINOIS 62525 May 28, 1982 Mr. James R. Miller, Chief Standardization & Special Projects Branch Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Miller:

Reference:

Clinton SER Outstanding Issue No. 1-

Transportation Accidents (NUREG-0853)

Clinton Power Station Unit 1 Docket No. 50-461 Enclosed is a copy of the Illinois Power Company re-sponse regarding Outstanding Issue #1 of the Clinton Safety Evaluation Report (SER-Section 2.2) on Transporation Accidents.

The response presents analysis demonstrating that toxic chemicals which may be shipped via the ICG Gilman line do not present a significant risk to the safe operation of the l

Clinton Power Station. This report ( Attachment fl) reviews the concerns associated with the shipment of all toxic chemical materials on the ICGRGL and concludes the following:

1. Some chemicals were eliminated from concern on the basis that the maximum control room concentra-i tion would be less than the two-minute exposure limit. This was determined from "HAZCHEM", a computer analysis program that evaluates the habitability of a power plant control room in the event of a toxic chemical release at or near a power plant.

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Mr. James R. Miller May 28, 1982

2. The remaining potential chemical. hazards were eliminated from concern by utilizing risk assessment methodology.

Since none of the toxic chemicals transported via the ICGRGL resulted in accident probabilities of 10-7 or greater per year, none of these accidents need to be considered as design basis-events for CPS.

Also enclosed, as Attachment #2, is a copy of the IP proposed revised response to NRC question 311.6, regarding transportation i of explosive materials via ICGRGL. This response was prepared to address NRC concerns regarding the potential hazards resulting from delayed ignition of a liquid petroleum gas (LPG) cloud formed as the result of a tank rupture near the. CPS.

This response concludes that, from a risk assessement stand-point, the delayed ignition of LPG gas clouds caused by the accidental rupture of a rail tank car need not be considered a design basis event for the CPS.

The general contents of these reports were discussed with Joe Sinisgalli, NRC Siting Analysis Branch reviewer, on May 28, 1982. In summary we request early review of these re-ports so that this issue can be closed out in the supplement to the SER.

Sincerely,

[

G. E. Wuller

' Supervisor - Licensing i Nuclear Station Engineering GEW/TLR/lt

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Mr. J . H. Williams , NRC Clinton Proj ect Manager
Mr. H. H. Livermore, NRC Resident Inspector Mr. A. A. Sinisgalli, NRC Siting Analysis Branch Illinois Dept. of Nuclear Safety I

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