ML20199H894

Discusses Responses to GL 96-06, Assurance of Equipment Operability & Containment Integrity During Design Basis Accident Controls, for Plant,Units 1 & 2

ML20199H894
Person / Time
Site:	Hatch
Issue date:	01/21/1999
From:	Olshan L NRC (Affiliation Not Assigned)
To:	Sumner H SOUTHERN NUCLEAR OPERATING CO.
References
GL-96-06, GL-96-6, TAC-M96819, TAC-M96820, NUDOCS 9901250368
Download: ML20199H894 (4)

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UNITED STATES j

j NUCLEAR REGULATORY COMMISSION l

' 4' WASHINGTON, D.C. 20555-0001 k,

January 21, 1999 Mr. H. L. Sumner, Jr.

Vice President - Nuclear Hatch Project Southern Nuclear Operating Company, Inc.

P.O. Box 1295 Birmingham, Alabama 35201-1295

SUBJECT:

GENERIC LETTEH pl ) 96-06 RESPONSES FOR THE EDWIN 1. HATCH NUCLEAR PLANT, UNITS i.^ND 2 (TAC NOS. M96819 AND M96820)

Dear Mr. Sumner:

Your January 27 and October 20,1997, submittals provide responses to 6L 96-06, " Assurance j

of Equipment OperabiCty and Containment Integrity During Design Basis Accident Controls," for Edwin 1. Hatch Nuclear Plant, Units 1 and 2. The staff has completed its review on the issue of thermally induced pressurization of piping runs penetrating the containment. The two-phase flow issues are still under staff review. The staff's evaluation of these issues will be sent to you in a separate letter.

In your submittal of January 27,1997, you identified four penetratior.s in Unit 1 and five l

penetrations in Unit 2 that are potentially vulnerable to a water solid velume that may be j

subjected to an increase in pressure due to heating of the trapped fluid. The affected four lines for Unit 1 are: Residual Heat Removal (RHR) Shutdown Cooling Suction Lines; Drywell Floor

' Drain Sump Discharge Lines; Drywell Equipment Drain Sump Discharge Lines; and Demineratized Water Lines to the Drywell. The lines involved for Unit 2 are those listed for Unit 1 plus one Drywell Chemical Drain Sump Line. You determined the affected penetrations 1

are operable based on an evaluation demonstrating acceptable piping plastic deformation and potential leakage through packing, bonnet gaskets, and/or valve seating surfaces, and you l

informed the NRC staff in your submittal of January 27,1997, that all susceptible systems are opmble and capable of performing their intended safety function. For long-term corrective action, you committed to revise operating procedures to include draining of each Demineralized Water Une penetrating the containment in each unit, and the Unit 2 Chemical Drain Sump Line, following each outage in which the lines are used.

l la the October 20,1997, submittal, you informed the staff that the design modifications to the j

l remaining three lines had been installed on Unit 2 during the refueling outage in March 1997, and modifications on Unit 1 were scheduled for installation during the fall refueling outage, which was then, in progress. The modification to the Drywell Floor Drain Sump and Drywell Equipment Drain Sump Discharge Lines consisted of installing a pressure relief valve in the section of isolated piping. The relief valves and piping were designed to meet the design-basis 8

requirements stated in the Updated Final Safety Analysis Report. Modification to the RHR Shutdown Cooling Suction Lines consisted of installing a bypass line from the section of isolated piping to upstream piping. The bypass line contains a check valve. The bypass piping and valves were also designed to meet the design-basis requirements.

l 9901250368 990121 V

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H. L Sumner, Jr. January 21, 1999 l

The staff finds tM' your corrective action provides an acceptable resolution for the issue of thermally induct d pressurization of piping runs penetrating the containment.

Sincerely, i

ORIGINAL SIGNED BY:

Leonard N. Olshan, Senior Project Manager Project Directorate ll-2 Division of Reactor Projects - 1/II Office of Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366 cc: See next page Dif1@l!tipfn Docket File HBerkow ACRS PUBLIC LBerry LPlisco, Ril

' PD 11-2 Rdg.

LOlshan PSkinner, Ril JZwolinski OGC l TO receive a copy of this document, Indicate in the box: "C" = Copy without attachment / enclosure

! 'E' = Copy with attachment / enclosure "N" = No copy _

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4. L. Sumner, Jr. l The staff finds that your corrective action provides an acceptable resolution for the issue of thermally induced pressurization of piping runs penetrating the containment.

Sincerely, s O, l

9' hey;AL g

Leonard N. Olshan, Senior Project Manager.

i Project Directorate ll-2 l

Divie8:.- of Reactor Projects - 1/II Office f Nuclear Reactor Regulation Docket Nos. 50-321 and 50-366

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no Edwin 1. Hatch Nuclear Plant

- cc:

Mr. Ernvid L Blake, Jr.

Charles A. Patrizia, Esquire -

-Shaw, Pittmar. Potts Paul, Hastings, Janofsky & Walker-

and Trowbridt,4 10th Floor 2300 N Street, Nh' 1299 Pennsylvania Avenue

. Washington, DC 20037 Washington, DC 20004-9500 1

Mr. D. M.' Crowe Chairman

&tunager, Licensing Appling County Commissioners jouthern Nuclear Operating County Courthouse Company, Inc.

Baxley, Georgia 31513 P. O. Box 1295 Birmingham, Alabama 35201-1295 Mr. J. D. Woodard Executive Vice President Resident inspector Southern Nuclear Operating C

Plant Hatch Company, Inc.

11030 Hatch Parkway N.

P. O. Box 1295 Baxley, Georgia 31531 Birmingham, Alabama 35201-1295

- Regional Administrator, Region ll Mr. P. W. Wells U.S. Nuclear Regulatory Commission General Manager, Edwin 1. Hatch Atlanta Federal Center

' Nuclear Plant 61 Forsyth Street, SW, Suite 23T85

. Southern Nuclear Operating L,

. Atlanta, Georgia 30303 Company, Inc.

U.S. Highway 1 North Mr.' Charles H. Badger -

P. O. Box 2010 -

O# ice of Planning and Budget Baxley, Georgia 31515 Room 610 -

270 Washington Street, SW.

Mr. R. D. Barker

Atlanta, Georgia 30334 Program Manager Fossil & Nuclear Operations Harold Rebels, Director.

Oglethorpe Power Corporation e

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~ Department of Natural Resources 2100 East Exchange Place i.

205 Butler Street, SE., Suite 1252 P. O. Box 1349 L

Atianta, Georgia 30334 Tucker, Georgia 30085-1349 Steven M. Jackson Senior Engineer-Power Supply -

Municipal Electric Authority' of Georgia l

1470 Riveredge Parkway, NW Atlanta, Georgia 30328-4684 n

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