ML20086R480

Forwards Response to Suppl 4 to Generic Ltr 88-20 Re Individual Plant Exam of External Events for Severe Accident Vulnerabilities.Preliminary Evaluation of High Winds & Floods Will Be Submitted in Jan 1994

ML20086R480
Person / Time
Site:	Wolf Creek
Issue date:	12/24/1991
From:	Rhodes F WOLF CREEK NUCLEAR OPERATING CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ET-91-0235, ET-91-235, GL-88-20, NUDOCS 9201020078
Download: ML20086R480 (4)

Text

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NUCLEAR OPEFMTING CORPOFMTION F u t st l imoden vge newu,ot t venna a T.on.u.i se,,u.* N ember 24, 1991 ET 91 0235 U. S.11aclear Regulatory Commission ATTN Document Control Desk Mail Station PI-137 Vashington, D. C. 20555 Reference Letter dated June 28, 1991. Generic Letter 88-20 Supplement 4 ' Individual l'1 ant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities

- 10 CFR 50.54(f)'

Subject:

Docist No. 50-4B2 Response to Generic Letter 68-20 Supplement 4 Gentlemen:

The purpose of this letter is to transmit Volf Creek Huclear Operating Corporation's (VCHOC) response to Generic Letter 88-20, Supplement 4:

' Individual Plant Examination of External Events (IPEEE) for Severe Accident Vulnerabilities - 10 CFR 50.54(f)'. The Reference requires the performance of a systematic examination to identify any plant-specific rulnerabilities to severe accidents and report the results to the Comminsion.

Attachment 1 provides the proposed program f or completing u;e Individual Plant Examination for External Events (IPEEE) for Volf Creek Generating Station and the schedule for submitting the results to the Commission.

If you have any questions concerning this matter, please contact me or Mr. S. G. Wideman of my staff.

Very truly yours, sx j f.J f]o '

- 97 / , /f p Forrest T. Rhodes Vice President

' Engineering & Technical services FTR/aem Attachment cci A. T. Howell (HRC), w/a R. D, Martin (NRC), w/a G. A. Pick (NRC), w/a /

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Forrest 7. Rhodes, of lawful age, being first duly sworn upon oath says that he is Vice President Engineering and Technical Services of Wolf Creek 11uclear Operating Corporations that he has read the foregoing document and knows the content thereof that he has exeruted that same for and on behalf of said Corporation with full power and authority to do son and that the facts therein stated are true and <:orrect to the best of his knowledge, information and belief.

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By '/Wj' Forrest T. Rhodes l

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Vice President Engineering & Technical Services SUBSCRIBED and sworn to bef ore me this J3 day of d< s. . 1991.

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Attachment to ET 91-0235 Page 1 of 2 Response to Generic Letter 88-20 Suppicment 4 ,

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' Individual Plant Examination of Eaternal Events (IPEKE) for Severe Accident Vulnerabilities - 10 CFR 50.54(f)'

Generic Letter 88 20 Supplement 4, requests licensees to describe their proposed programs for completing the Individual Plant Examinations of External Events (IPEEEs) by Dec.1ber 24, 1991. As stated in NRC SECY 91-102, the procedures for the seismic walkdown portion of this program are

'one of the most important ingredients in the seismic IPEEE'. Because of similarities between the USI A.46. 'Sej smic Qualification of Equipnent in Operating Plants', at,d seismic IPEEE programs. Wolf Creek Nuclear Operating Corporation (WCNOC) intends to train seismic IPEEE walkdown personnel at training courses currently being developed by the Seismic Qualification Utility Group (SQUG). However, the anticipated Supplemental Safety Evaluation Rouart (SSER) on tho SQUG's Generic Implem'sntation Procedure (GIP) for resolution of USI A-46 has not been made a'allable in sufficient time to permit fina11tation and scheduling of the SQUG training courses.

VCNOC intends on conducting the seismic IPEEE program as described below.

Upon receipt and review of the SSER, WCNOC may modify its progtam and/or schedule for conducting the seismic IP2EE depeading on the content of the SSER and resolution of open issues.

Request Identify the methods and approach selected for performing the IPEEE.

Response

VCNOC will perform a seismic Level 1 PRA plus containment performance analysis for Wolf Creek Generating St* tion (WCGS) to meet the evaluation requirements for seismic events. The selas..ic PRA vill use current methods and plant information. The seismic enhancements identified in Apper; dix 1 of Generic Letter 88-20, Supplement 4 will be considered as part of the WCGS l seisg'ic PRA.

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VCNOC will perform a fire FRA to meet the evaluation requirements for internal fires.

VCNOC will use a screening type approach shown in Figure 1 of Generic better l

88-20. Supplement 4 to evaluate the impact of high winds, external floods, r and transportation and nearby facility accidents on WCGS.

l Request Describe the method to be used if it h&a not been previously submitted for staff review (the description r.ay be by reference).

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Attachment to ET 91-0235

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. Response The above methods have been described in Generic 1.etter 88 20. Supplement 4, as acceptable to the NRC Staff.

Request Identify the mil.estones and schedule for performing the IPEEE, and submitting the results to the NRC.  ;

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Response

January, 1994 Preliminary evaluation completed for high i winds, floods, and Transportation and Nearby Facility Accidente June, 1994 Preliminary analysis completed for internal fire event 6 L

January, 1995 Preliminary analysis completed for seismic  !

f events i- ,

September, 199$- IPECE report submitted to NRC L The WCHOC personnel who are currently developing the Individual Plant >

E Examiation (IPE) f or WCGS are the same individuals who will perform the  ;

analyses for the IPEEE. Therefore, the initiation of the IPEEE work will be delayed until. completion and submittal of the IPE report. The WCGS IPEEE submittal schedule is based on the IPE submittal date (September 1992) plus .

3 years. This schedule allows WCNOC to utilize the experience and knowledge gained in developing the IPE and maximize the amount of the WCGS IPEEE werk that will be performed by WCN00 personnel.

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