ML23109A079
| ML23109A079 | |
| Person / Time | |
|---|---|
| Issue date: | 04/13/2023 |
| From: | NRC/OCIO |
| To: | |
| Shared Package | |
| ML23109A075 | List: |
| References | |
| NRC-2022-000160 | |
| Download: ML23109A079 (1) | |
Text
aDuke Duke Power r,Power... Oconcr Nuclear Site P. O. Box 1439 Sen eca, SC 29679 (864 ) 885-300 0
March 31, 1999
U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555
Subject:
Oconee Nuclear Station
- Docket Nos. 50-269, - 270, -287 Oconee IPEEE Analysis - Response to Request for Addi t ional Informati on dated January 5,
1999.
By letter dated November 30, 1990, Duke Energy Corporation (Duke) submitted to the. NRC the IPE Submittal Report and. a three volume Oconee PRA Report, presenting the information on severe accident risk associated with Oco ne e.
Subsequently, on April 1, 1 993, the NRC issued th~ NRC's
- evaluation report on the internal.events portion of the above IPE submittal. As required by NRC GL 88-20, Supplement 4*, Duke submitted to -the NRC on December 21, 1995, the Oconee IPEEE Report. The seismic portion of the IPEEE report was supplemented by an additional Duke submitta l (Oconee Nuclear Station Supplemental IPEEE Report) on.December 18, 1997. The information contained in the following attachments provides Duke's response to the NRC's Request For Additional Information concerning the Oc onee IPEEE analysis dated J~nuary 5, 1999. Attachment 1 is ti *tled "Duke Energ y Corporation, Oconee Nuclear Stati o n, IPEEE Responses to.NRC *RAI, March 1999".
Attachment 2 is titled "Appendix A, Oconee IPEEE, Fire.. ~/v/;
Walkdown Information". Attachment 3 is titled "IPEEE Fire Protection Walkdown Checklist, Oconee Zones ~5, '67, 89, 98".
U. S. Nuc.lear Regulatory Commission March 31, 1999 Page Two
If there are any additional questions, please contact Reene' Gambrell at (864) 885-3364.
Very truly yours,
~~~~~ w. R. Mccollum,~
Site Vice President Oconee Nuclear Site
RVG
Attachme _nts U. S. Nuclear Regulatory Commission March 31, 1999 Page Three
XC: D. E. LaBarge, ONRR Project Manager
L.A. Reyes Regional Administrator, ' Region II
M. A. Scott Senior Resident Inspecto~
V. R. Autry, DHEC ATTACHMENT 1
DUKE ENERGY CORPORATION
OCONEE NUCLEAR STATION
Responses to NRC RAI
March 1999 DUKE ENERGY CORPORATION
OCONEE NUCLEAR STATION
Responses to NRC RAI
March 1999 TAB LE OF CONTENTS
Section Page
]. INTRODUCTION 1
- 2. FIRES 2 2.1 Summary of the Approach to the Fire Analysis 2 2.2 Responses To RAJ Questions 8 Question 1 8 Question 2: 16 Question 3: 23 Question 4: 26 Question 5: 30 Question 6: 34
- 3. SEISMIC 39 Question 1: 39 Question 2: 47 Question 3: 52
- 4. HIGH WINDS, FLOODING, AND OT_HER EXTERNAL EVENTS 56 Question : 56
- 5. REFERENCES 57
Appendix.A Fire Walkdown Data For Selected Zones
ii
- 1. I NTRO DUCT ION
By letter of Novem ber 30, 1990, Duk e E ne rgy Corporation (Duke) submitted to the NRC the IPE Submittal Report and a three-volume Oconee PRA Report, presenting the information on severe accident ri sk (including th at fro m exte rnal events) assoc iated with Oconee. Subsequently on April 1, 1993, the NRC issued the NRC's evaluation report on the internal events portion of the above IPE submittal.. As required by NRC GL 88-20, Supplement 4, Duke submitted to the NRC on December 21, 1995 the Oconee IP EEE Report. The seis mic portion of the IPEEE report was suppl emen ted by an additional Duke submittal (Oconee Nuclear Station Supplemental IPEEE Report) on December 18, 1997.
This report presents the Duke responses to the January 5, 1999 NRC request for addi~iona l information concerning the Oconee IPEEE analysis.
Section 2 contains the res ponse s to the question s involving fire s. The re sponses to the questions dealing with seismic events are presented in Section 3. Section 4 deals with the res ponse s for high wind, flood, and other external events.
During the development of the responses to the fire RAis, a follow-up plant walkdown was performed to collect additional infonnation and support the additional analysis requested. The scope of thi s walkdowri was limited to the plant areas and issues discussed in the se responses.
4. HIGH WINDS, FL OODING, AND OTHER E.XTERNAL EVENTS
QUES T ION :
As noted in NUREG-1407, Section 2.4, the latest probable maximum precipitation (PMP) criteria published by the National Weather Service calls for higher rainfall intensities over shorter intervals and smaller areas than have previously been considered; this could result in higher site flooding leve ls and greater. roof ponding levels. Please assess the effect s of applying these new PMP criteria to Oconee. Add itional information is give n in Generic letter 89-22.
Response :
An updated flood study for the Oconee site, wh ich includes the Keowee darn and reservoir, was performed in 1995 [Ref. 15]. This study used the crite ria conta ined in the hydromete ro logical reports l isted fo Generic Letter 89-22. The resu lts of this study were comparab le to the results of the previou s study referenced in the Oconee IPEEE report.
Both studies demonstrated that the Keowee reservoir could accommodate the reservoir flood ing tqat cou ld resu lt from a PMP.
56
- 5. REFERENCES
Sugnet, W.R., et al., "Oconee PRA, A Probabilistic Risk Assessment of Oconee Unit 3", Duke Power Company and the Electric Power Research Institute Report NSAC-60, June _1984.
2 Oconee Nuclear Power Station, Unit 3, Probabilistic Risk Assessment. Duke Power Company, Rev ision I, 199 1.
3 Oconee Nuclear Station /PE Submit/al Report. Duke Power Company, December 1990.
4 Procedural and Submit/al Guidance for the Individual Plant Examination of External Events (/PEE£) for Severe Accident Vulnerabilities. U.S. Nuclear Regulatory Commission Report NUREG-1407, June 1991.
5 Oconee LPI operating procedure (indicates breakers for LPI valve s are tagged out during power operation).
6 Berry, D.L. and E.E. Minor. Nuclear Power Plant Fire Protection-Fire Hazards Analysis (Subsystems Study Task 4). U.S. Nuc lear Regulatory Commission Report NUREG/CR-0654, September 1979.
7 Oconee Nuclear Station /PEE£ Submittal Report. Duke Power Company, December. 1995.
8 Houghton, J.R. Special Study: Fire Events - Feedback of U.S. Operating Experience. U.S. Nuclear Regulatory Commission Report AEOD/S97-03, June 1997.
- 9 MCM-1354.00-00-0029, Cable Application Fault Tests, Duke Power Company -
McGuire Nuclear Station, August 1976
10 USNRC, NUREG/CR-0098, Development of Cr iteria for Seismic Review of Selected Nuclear Power Plants, 1978.
11 EPRI NP-6041-SL, Rev. 0 and Rev. l, A Methodology of Assessment of Nuclear Power Plant Seismic Margin, October 1988 and August 1991.
12 Hannaman, G.W., et al., Human Cognitive Reliability Modetfor PRA Analysis, Electric Power Research In~titute Report RP-2847-1 (Interim Report), December 1984. -
57 13 Parry, G.W., et al., An Approach to the Analysis of Operator Actions in Probabilistic Risk Assessment, Electric Power Research Institute Report TR-
- 100259, June 1992.
14 Moieni, P., et al., Modeling of Recovery Actions in PRAs, Report APG#lS (NUS-5272) for Electric Power Research Institute (Draft), April 1991.
15 FERC Project Number 2503, Determination for the Probable Maximum Flood for the Keo wee De.velopment of the Keowee-Toxaway Project, Duke Power Company, March 29, 1995.
58