U-601927, Provides Updated Info Re Shipments of Hazardous Matls Transportation on Gilman Line of Il Central Railroad,Per Commitment in Updated SAR to Perform Survey Every Three Years

Provides Updated Info Re Shipments of Hazardous Matls Transportation on Gilman Line of Il Central Railroad,Per Commitment in Updated SAR to Perform Survey Every Three Years

ML20092B905
Person / Time
Site:	Clinton
Issue date:	02/06/1992
From:	Spangenberg F ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
U-601927, NUDOCS 9202110175
Download: ML20092B905 (3)

Text

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- , . ' CWel e4 cowfd !M:vi e O D:n Lib ChNan Il tifH lt?il7 M h4t:1 ILLINOIS U. colm POWER uo.92m2 e te i 1A.l?O j rebruary 0, 1"?

U, S. Nuclear Regulatory Conantesion Document Control Desk Washington, D.C. 20$55

Subject:

Clinton Power Station Evaluation of potential 1ransriort a V on A,tridgnu

Dear Sir:

The Clinton power Statton Undated Safety Analyh,is Report (USAR),

Section 2.2.3, contains the commitment that I'linois Power will perform a survey every three years of all shipments of hazardous materials transportation on the Cilman Line of the Illinois Central Railroad. This survey will provide assurance that the existing transportation patterns have not changed significantly enough to have railroad transportation accidents considered a design basis accident.. In addition, the USAR specificu that if the original acceptance limits of a toxic material have been exceeded, Illinois Power will provide, within six months, sensors that will isolate the control room heating, ventilating, and air conditioning system should the identified chemicals present a potential toxic environment. This letter fulfills the USAR colnmitment.

This update evaluaus the risks of flammable and toxic hazards associated with railroad transportation past Clinton Power Station (CPS).

The " rail traffic" of concern is on the Illinois Central Railroad Gilman Line which passes approximately 0.75 miles north of the Clinton Power Sta,lon. At 1111 noir Pover's request, the Illinois Central Railroad completed a survey of rail traffic on the Cilman Line by reviewing their shipping records for the calendar year 1991. llazardous materials are identified on the shipping record by a 49 series Standard Transportation Commodity Code (STCC) number. This code series includes flammable and toxic materials. Since Title 49 of the Code of Federal Regulations requires that hazardous materials must be identified on all shipping records, this survey of hazardous materials is deemed to be totally inclusive.

The Illinois Central Railroad survey indicated that the only hazardous materials shipped past the Clinton Power Station in 1991 were 104 carloads of phosphoric acid and eight carloads of anhydrous ammonia, as noted in the attachment to this letter. There were no shipments of flammable material on the Climan Line in 1991. The total number of hazardous material shipments on the Cilman Line increased slightly since the 1988 hazardous material survey was performed . The C11 man Line is used only for local traffic carrying primarily grain and relatively insignificant amount s of hazardous material . Illinoir Power believes there will be no significant increase in hazardous material traffic.

9202110175 920206 PDR R

ADOCK 05000461 PDR b3f l

Page 2 of 2 d

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L Af ter identifying the hazardous materials transported on the Cilman  !

Line in 1991, Illinois Power completed an assessnent of the risks these i materials asight pose to the safe operation of CPS. Rc6ulatory Guide 1.78,  !

Revision 0, "Asstunptions for Evaluating the liabitability of a Nuclear Power  ;

plant Control Room During a Postulated llazardous Chemical Release," '

.,- specifies a control room habitability evaluation be conducted for each i hazardous material shipped by rail with a frequency of 30 or more earloads l

Per year. Since only eight earloads of anhydrous ammonia passed by CPS, a control room habitability analysis was not required, llowever, additional evaluation was required for the 104 carloads of phosphoric acid listed on l the attachment.

As part of the evaluation of phosphoric acid, a review of Regulatory '

Guide 1,78 indicated that Itquids with a vapor precsure of less than 10 i torr may be eliminated from further consideration as a risk to plant  !

operation. Based on information provided by the consignee of the phosphoric acid, it was determined that. the 104 cars contained undiluted phosphoric acid consisting cf 706 phosphorus pentoxide. This material is i used to manufacture fertilizer. The vapor presst,rc of a 1006 concentration of phosphoric acid is less than 10 torr at 100 degreen Fahrenheit, Additional evaluation of the risk to plant safety from phosphoric acid therefore is not required.

The results of this assessment demonstrate that the risks associated 4

with railroad transportation hazards remain acceptably low and that installation of chemical sensors necessary to protect the main control room environriient is not necessary.

If you have any questions or require additional information, please  ;

contact ILS. i Sinceroly yours, ,

t-

, . CAAt JC % '

F, A. Spa genber Manager. Licens1:g, g and Ill So ety l JSP/alh t.ctachment f

cc: NRC Clinton Licensing Project Manager NRC Resident Inspector Regional Administrator, Region III, USNRC Illinois Dopartment of Nuclear Safety 4

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HAZARDOUS MATERIAL i fjjlPPED ON Tile G11RAN LINE IN 1991 l i

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$1Q.Q tB1rX1AL CARLOADE i i

I 4930247 Phosphoric Aci' 104  ;

I 4904210 Anhydrous Ananonia 8 l

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