ML20211C457
| ML20211C457 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/16/1999 |
| From: | Jaffe D NRC (Affiliation Not Assigned) |
| To: | Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| TAC-MA83608, NUDOCS 9908260007 | |
| Download: ML20211C457 (3) | |
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i August 16, 1999 Mr. C. Lance Terry TU Electric Senior Vice President
& Principal Nuclear Officer Attn: Regulatory Affairs Department P. O. Box 1002 Glen Rose, TX 76043
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES), UNITS 1 AND 2 -
INDIVIDUAL PLANT EXAMINATION OF EXTERNAL EVENTS (TAC NO. MA83608)
Dear Mr. Terry:
On July 8,1999, the NRC staff issued the individual plant examination of external events for CPSES, which included a Safety Evaluation and a contractor's Technical Evaluation Report (TER). In the process of reproducing the July 8,1999, letter and enclosures, page 13 of the contractor's TER was omitted. Enclosed is the subject page.
Sincerely, ORIGINAL SIGNED BY David H. Jaffe, Senior Project Manager, Section 1 Project Directorate IV & Decommissioning Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-445 and 50-446
Enclosure:
Page 13 of the TER cc w/ encl: See next page DISTRIBUTION OGC Docket File f ACRS A. Rubin, RES PUBLIC E. Chow,RES C. Woods, RES PDIV-1 Reading D. Coe, NRR K.Brockman,RIV To receive a copy of Inis document, indicate "c" in the box PDIV-1/th M PDIV-1/SC C.
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Senior Resident inspector Office of the Governor U.S. Nuclear Regulatory Commission ATTN: John Howard, Director P. O. Box 2159 Environmental and Natural Glen Rose, TX 76403-2159 Resources Policy P. O. Box 12428 l
Regional Administrator, Region IV Austin, TX 78711 1
U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arthur C. Tate, Director Arlington,TX 76011 Division of Compliance & Inspection Bureau of Radiation Control Mrs. Juanita Ellis, President Texas Department of Health Citizens Association for Sound Energy 1100 West 49th Street 1426 South Polk Austin, TX 78756-3189 Dallas, TX 75224 Jim Calloway Mr. Roger D. Walker Public Utility Commission of Texas Regulatory Affairs Manager Electric Industry Analysis TU Electric P. O. Box 13326 P. O. Box 1002 Austin, TX 78711 3326 Glen Rose,TX 76043 George L. Edgar, Esq.
l Morgan, Lewis & Bockius 1800 M Street, N.W.
Washington, DC 20036-5869 Honorable Dale McPherson County Judge P. O. Box 851 Glen Rose, TX 76043 l
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Review Findings The Comanche Peak seismic IPEEE submittal provides a brief description of evaluations performed for outliers. Outliers were evaluated using the relevant seismic qualification documentation to insure that the observed critical or suspected details were adequately addressed. Other anomalies, such as potential seismic interaction issues, were also noted in the walkdowns, and similar actions were taken to evaluate their impact.
Although only a few anomalies were identified, the submittal's description suggests that these outliers were appropriately evaluated against design-basis criteria, consistent with the guidelines of NUREG-1407.
2.1.9 Relay Chatter Evaluation The Comanche Peak seismic IPEEE did not implement a relay chatter evaluation.
For a reduced-scope plant, a relay chatter evaluation is not requested in NUREG-1407, unless the plant also falls under the USI A-46 program. CPSES is not a USI A-46 plant. Hence, the lack of a relay chatter evaluation in the Comanche Peak seismic IPEEE is considered justified.
2.1.10 SoilFailure Analysis The Comanche Peak seismic IPEEE does not implement an analysis of potential soil failures and their related impacts.
No analysis of potential soil failures is requested by NUREG-1407 as part of the seismic IPEEE for a reduced-scope plant. Furthermore, Comanche Peak is predominantly a rock site. Thus, the lack of a soils failure analysis in the Comanche Peak seismic IPEEE is considered justified.
2.1.11 Containment Performance Analysis A containment safeguards equipment list was developed for the Comanche Peak seismic IPEEE. The list of selected components pertains to items needed to prevent early failure of containment functions. The seismic containment performance analysis involved a walkdown of containment-related systems, to identify any anchorage or potential spatial interaction problems. The treatment of containment safeguard systems was similar to that for SSEL items. Containment penetrations were evaluated in the IPE; no specific evaluation of penetrations for seismic failure modes was conducted in the IPEEE. The IPEEE submittal notes that the IPE also showed that containment fan coolers are not required for containment success, and hence, they were not credited (nor evaluated)in the seismic IPEEE. (Success of the containment cooling function was addressed only through evaluation of the containment spray system.)
The two containment safeguard systems that were evaluated in the seismic IPEEE include the containment spray system and the containment isolation system. Success criteria for these systems were determined from a review of system notebooks prepared for the IPE; then, the plant logic diagrams were consulted to identify the components required for containment success. The resulting containment systems equipment list was comprised of a significant number of components.
The containment performance assessment in the Comanche Peak seismic IPEEE isjudged to be a meaningful examination of potential containment vulnerabilities.
Energy Research, Inc.
13 ERl/NRC 95-509