ML20206G482

Informs That NRC Reviewed Re GL 96-06, Assurance of Equipment Operability & Containment Integrity During Design Basis Accident Conditions & Accepts Resolution for Issue of Thermally Induced Pressurization

ML20206G482
Person / Time
Site:	Duane Arnold
Issue date:	05/04/1999
From:	Mozafari B NRC (Affiliation Not Assigned)
To:	Protsch E IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
References
GL-96-06, GL-96-6, TAC-M96808, NUDOCS 9905100028
Download: ML20206G482 (4)

Text

',

-: - i' . Mr. Pr&sid:nt Eliot Protsch May 4, 1999 9- IES Utilitics Inc. __

' 200 First Str&2t, SE J

? . P.O. Box 351

Cedar Rapids, IA 52406-0351

SUBJECT:

GENERIC LETTER 96-06 RESPONSE REGARDING THERMALLY INDUCED PRESSURIZATION FOR THE DUANE ARNOLD ENERGY CENTER (TAC NO. M96808)

- Dear Mr. Protschi The NRC staff has reviewed the letter submitted on January 28,1997, by lES Utilities, Inc. (the licensee) regarding Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design Basis Accident Conditions." The licensee's January 28, 1997, submittal provides its response to the generic letter for the Duane Arnold Enargy Center, in its response of January 28,1997, the licensee identified four penetrations which were vulnerable to a water solid volume that would be subjected to an increase in pressure due to heating of trapped fluid.'The four identified penetrations are: a residual heat removal (RHR) shutdown cooling line, a condensate domineralized water supply line, a drain line from the drywell equipment sump, and a drain line from the drywell floor drain sump. In the January 28, 1997, letter, the licensee stated that the potential for thermally induced pressurization of these

. lines was eliminated by the following actions: one of these penetrations was modified to add a bypass line with a check valve, one of the penetrations is maintained in the drained condition, ,

and two of the penetrations were modified to install expansion chambers. The licensee stated that these actions were completed during Refueling Outage 14. ' The licensee determined in its evaluation that no other piping segments penetrating containment are susceptible to thermally induced pressurization.

The NRC staff finds that the licensee's corrective actions provide an acceptable resolution for the issue of thermally induced pressurization of piping runs penetrcting the containment.

If you have any questions regarding this issue, please contact me at 301-415-2020.

Sincerely Original signed by:

Brende ! Mozafari, Project Manager, Section 1 Project Directorate 111 Division of Licensing Project Management jO'I922 Office of Nuclear Reactor Regulation Docket No. 50-331' g"*} g gj g cc: See next page ' 1 DISTRIBUTION - . D Docket File PUBLIC GHammer PD3-1 Reading - GGrant, Rlli JZwolinski/SBlack^

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DATE 4 /M99 6/S/99 4/ 03 /99' > '

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May 4, 1999 i is Inc.

E L "f 200 First Strett, SE P.O. Box 351

_ Cedar Rapids, IA 52406-0351

SUBJECT:

GENERIC LETTER 96-06 RESPONSE REGARDING THERMALLY INDUCED PRESSURIZATION FOR THE DUANE ARNOLD ENERGY CENTER (TAC NO. M96008)

Dear Mr. Protsch:

The NRC staff has reviewed the letter submitted on January 28,1997, by IES Utilities, Inc. (the licensee) regarding Generic Letter (GL) 96-06, " Assurance of Equipment Operability and Containment Integrity During Design Basis Accident Conditions.' The licensee's January 28, 1997, submittal provides its response to the generic letter for the Duane Arnold Energy Center.

In its response of January 28,1997, the licensee identified four penetrations which were vulnerable to a water solid volume that would be subjected to an increase in pressure due to heating of trapped fluid. The four identified penetrations are: a residual heat removal (RHR) shutdown cooling line, a condensate domineralized water supply line, a drain line from the drywell equipment sump, and a drain line from the drywell floor drain sump. In the January 28, 1997, letter, the . licensee stated that the potential for thermally induced pressurization of these lines was eliminated by the following actions: one of these penetrations was modified to add a '

bypass line with a check valve, one of the penetrations is maintained in the drained condition, and two of the penetrations were modified to install expansion chambers. The licensee stated that these actions were completed during Refueling Outage 14. The licensee determined in its evaluation that no other piping segments penetrating containment are susceptible to thermally induced pressurization.

The NRC staff finds that the licensee's corrective actions provide an acceptable resolution for the issue of thermal'y induced pressurization of piping runs penetrating the containment.

If you have any questions regarding this issue, please contact me at 301-415-2020. 3 Sincerely Original signed by-Brenda L. Mozefari, Project Manager, Section 1 i Project Directorate Ill j Division of Licensing Project Management  ;

Office of Nuclear Reactor Regulation Docket No. 50-331 cc: See next page DISTRIBUTION l Docket File PUBLIC GHammer  !

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MI.Niot Protsch WASHINGTON D.c. 20046 0001 May 4, 1999 l

President IES Utilities Inc.

200 First Street, SE Il P.O. Box 351 l Cedar Rapids, IA 52406-0351

SUBJECT:

GENERIC LETTER 96-06 RESPONSE REGARDING THERMALLY INDUCED I PRESSURIZATION FOR THE DUANE ARNOLD ENERGY CENTER l (TAC NO. M96808) 1 Dear Mr. Protsch- I i

The NRC staff has reviewed the letter submitted on January 28,1997, by lES Utilities, Inc. (the ,

licensee) regarding Generic Letter (GL) 96-06, " Assurance of Equipment Operability and j Containment Integrity During Design Basis Accident Conditions." The licensee's January 28, 4 1997, submittal provides its response to the generic letter for the Duane Arnold Energy Center.  !

l In its response of January 28,1997, the licensee identified four penetrations which were i vulnerable to a water solid volume that would be subjected to an increase in pressure due to  ;

heating of trapped fluid. The four identified penetrations are: a residual heat removal (RHR) shutdown cooling line, a condensate domineralized water supply line, a drain line from the drywell equipment sump, and a drain line from the drywell floor drain sump. In the January 28,  ;

1997, letter, the licensee stated that the potential for thermally induced pressurization of these i lines was eliminated by the following actions: one of these penetrations was modified to add a  !

bypass line with a check valve, one of the penetrations is maintained in the drained condition,  ;

and two of the penetrations were modified to install expansion chambers. The licensee stated 4

- that these actions were completed during Refueling Outage 14. The licensee determined in its evaluation that no other piping segments penetrating containment are susceptible to thermally l Induced pressurization. I The NRC staff finds that the licensee's corrective actions provide an acceptable resolution for j the issue of thermally induced pressurization of piping runs penetrating the containment. l If you have any questions regarding this issue, please contact me at 301-415-2020.

Sincerely a

i Brenda L. Mozafari, Project Manage , Section 1 j Project Directorate ill l Division of Licensing Project Management  !

Office of Nuclear Reactor Regulation  :

l Docket No. 50-331 cc: See next page  :

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• l j ' Mr. Eliot Protsch IES Utilities Inc.

Duane Arnold Energy Center cc:

Jack Newman, Esquire Al Gutterman, Esquire

- Morgan, Lewis,- & Bockius 1800 M Street, NtN.

- Washington, DC 20036-5869 Chairman, Linn County Board of Supervisors i Cedar Rapids,lA 52406 l l

IES Utilities Inc.  !

ATTN: Gary Van Middlesworth Plant Superintendent, Nuclear 3277 DAEC Road Palo,IA 52324 1

John F. Franz, Jr.

Vice President, Nuclear Duane Arnold Energy Center 3277 DAEC Road Palo,IA 52324 Ken Peveler l Manager of Regulatory Performance l

Duane Arnold Energy Center '

- 3277 DAEC Road Palo,IA 52324 U.S. Nuclear Regulatory Commission Resident inspector's Office Rural Route #1 Palo,IA 52324 Regional Administrator, Rlll U.S. Nuclear Regulatury Commission 801 Warrenville Road Lisle, IL 60532-4531 Parween Baig -

l Utilities Division lowa Department of Commerce Lucas Office Building,5th floor Des Moines,IA 50319 l

l

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