ML20055J397

Requests Addl Info Re Steam Generator Tube Rupture Operator Action Times for Plant.Response Requested within 30 Days of Receipt of Ltr

ML20055J397
Person / Time
Site:	Wolf Creek
Issue date:	07/24/1990
From:	Pickett D Office of Nuclear Reactor Regulation
To:	Withers B WOLF CREEK NUCLEAR OPERATING CORP.
References
TAC-57363, NUDOCS 9008020207
Download: ML20055J397 (3)

Text

! July 24, 1990 Docket No. 50 482 Mr. Bart D. Withers President and Chief Executive Officer 1 Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, Kansas 66839

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION CONCERNING STEAM GENERATOR TUBE RUPTURE OPERATOR ACTION TIMES FOR THE WOLF CREEK  :

GENERATINGSTATION(TACNO.57363)

The staff is continuing its review of the steam generator tube rupture analysis that was submitted in accordance with license condition 2.C.(11) of the Wolf Creek operating license. Specifically, the staff is reviewing the operator i response times provided in your letter of February 4,1987. In order to ,

continue its review, the staff requests the additional information identified '

in the enclosure. I This iequest for information affects fewer than 10 respondents; therefore, OMB  !

cleararce is not required under P.L. 96 511. He request that you respond to  !

the enclosure within 90 days following receipt of this letter. I Sincerely, 1

OriolnalSignedBy:

Douglas V. Pickett, Project Manager Project Directorate IV.2 Division of Reacte Projects . III, IV, Y and Special Projects ,

Office of Nuclear Reactor Regulation

Enclosure:

DISTRIBUTION Request for Information (Docket M W 1

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L DATE : 7/QG00

7/29/90 7M90  :  :  :

OFFICIAL RECOR0 40PY Document Name: REQUEST ADDITIONAL INFO

a Mr. E.'.rt D. Withers

• CC' Jay Silberg, Esq. .

Mr. Gary Boyer Plant Manager Shaw, Pittman. Potts & Trowbridge Wolf Creek Nuclear Operating Corporation 1800 M Street, NW P. O. Box 411 Washington, D.C. 20036 Eurlington, Kansas 66839 Pr. Chris R. Rogers P.E. Regional Administrator, Region IV Manager. Electric Department U.S. Nuclear Regulatory Comission Public Service Comission 611 Ryan Plaza Drive, Suite 1000 P. O. Box 3f0 Arlington, Texas 76011 Jeff erson City, Missouri 65102 Mr. Otto Haynard, Manager Regional Administrator, Region III Regulatory Services U.S. Nuclear Regulatory Comission Wolf Creek Nuclear Operating Corporation 799 Roosevelt Road P. O. Cox 411 Clen Ellyn, Illinois 60137 Burlington, Kansas 66839 Senior Resident Inspector U. S. Nuclear Regulatory Comission P. O. Box 311 Burlington, Kansas 66839 Mr. Robert Elliot, Chief Engineer Utilities Division Kansas Corporation Comission 4th Floor - State Office Building Topeka, Kansas 66612-1571 l

Office of the Governor State of Kansas q Topeka, Kansas 66612 Attorney General 1st Floor - The Statehouse Topeka, Kansas 66612 Chairman, Coffey County Comission Coffey County Courthouse Burlington, Kansas 06839 Mr. Gerald Allen Public Health Physicist 4 Bureau of Air Quality & Radiation Control i

Division of Environment Kansas Department of health end Environnent Forbes Field Building 321 Topeka, Kansas 6f620

I 4

ENCLOSURE 1 RE0l'EST FOR ADDITIONAL INFOR!!ATION i

OPERATOR ACTION TIMES DURING A STEAM GENERATOR

. TUBE RUPTURE EVENT i

WOLF CREEK litICLEAR POWER PLANT -

(TAC NO. 57303)

The staff has determined that the operator ressonse times provided by the {

licensee in its February 4,1987 response to tie staff's request for information of November IP 1986 are inappropriate for the purposes of the staff's review.  ;

Specifically, the staff understands that the licensee has estimat_ed these times '

rather than demonstrated them. i In its letter to the Westinghouse Owners Group dated March 30,1987, the staff i reouired "...camonstration runs... to show that the accident can be mitigeted t within a period of time compatible with overfill prevention, using design basis assumptions regarding available equipment and to demonstrate that the operator action times assumed in the analysis are realistic." The licensee has provided an analysis that uses "best-guess averages" for operator response times for critical tasks, such as identifying the steam generator tube rupture through recognition of increesing, uacontrolled level or high radiation.

The licensee should provide further information that demonstrates that the o>erator response times assuned in the Wolf Creek analysis are realistic; t1at is, are representative of the current o)erator population at the plant, and that the maximum response times fall wit 11n the sounds of the analysis.

This information should address both control room actions and actions performed outside the control room such as manual steam generator liquid saepling.

T The licensee should provide response times for the following operator actions:

o identify ruptured steam generator.

o Isolete ruptured steam generator.

l o Initiate cooldown of reactor coolant system.

l o Complete cooldown of reactor coolant system.

l o Initiate depressurization of reactor coolant system, o Complete depressurization of reactor coolant system.

o Initiate safety injection, o Terminate safety injection, o Equalize pressure.

Assuming design basis conditions, the licensee should provide demonstrated operator action times for (1) the worst case dose scenario and (2) the worst case overfill scenario.

l

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