ML20129J434
| ML20129J434 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 10/30/1996 |
| From: | Link B WISCONSIN ELECTRIC POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-96-06, GL-96-6, VPNPD-96-090, VPNPD-96-90, NUDOCS 9611060256 | |
| Download: ML20129J434 (2) | |
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Wisconsin Electnc POWER COMPANY 231 W Michigott PO Box 2046. Milwoukee.WI 53201 2046 (414)221-2345 VPNPD-96-090 October 30,1996 Document Control Desk US NUCLEAR REGULATORY COMMISSION Mail Station PI-137 Washington, DC' 20555 Ladies and Gentlemen:
DOCKETS 50-266 AND 50-301
~ OENERIC LETTER 96-06 ASSURANCE OF EOUIPMENT OPERABILITY AND CONTAINMENT INTEGRITY DURING DESIGN BASIS ACCIDENT CONDITIONS P0lNT BEACH NUCLEAR PLANT. UNITS 1 AND 2 l
Generic Letter 96-06 requests licensees to perform evaluations and take actions if necessary to ensure that containment cooling water systems and other water-filled piping sections inside containment remain operable during design basis accident (DBA) conditions. This letter identified concerns for potential waterhammer and two-phase flow in containment cooling systems under certain postulated post-DBA conditions. Also identified was a concern for overpressurization ofisolated fluid systems due to containment heatup post-accident.
Herein, we provide the required 30-day response which indicates that: (1) the requested actions have been or will be completed; (2) the requested information has been or will be submitted; and (3) the requested information will be submitted within the 120-day requested time period. Dese three actions are discussed below:
(1) The requested actions have been or will be completed.
With respect to waterhammer and two-phase flow conditions in containment cooling systems, the requested actions have been completed. We have determined that the PBNP containment fan cooler (CFC)/ service water systems are susceptible to waterhammer and two-phase flow conditions during postulated accident conditions. We have assessed the system's operability with respect to NUREG/CR-5220,10 CFR 50 Appendix B, the Technical Specifications, and Generic letter 91-18. We have reported the results in letters to the NRC; VPNPD-96-065 dated September 9,1996 and VPNPD-96-080 dated September 30, 1996. These evaluations conclude that the systems are presently operable; however, long-term corrective j
actions are planned to restore the systems to full compliance with the original design basis. Permanent corrective actions are being evaluated and a schedule for final corrective actions is presented in the above submittals: Hese letters also constitute our submittal for a " written summary report" within 120 days of the date of the Generic Letter.
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4 Document Control Desk October 30,1996 i
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With respect to thermally-induced overpressurization of water-filled piping sections inside containment, the l
requested actions will be completed. We have previously evaluated PBNP systems and determined that six (6) water-filled piping sections in each containment are potentially susceptible to thermally-induced overpressurization. The results of these evaluations and subsequent corrective actions will be provided with our 120-day response. Any identified operability concerns will be addressed commensurate with the t
guidance of GL 91-18.
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(2)
The requested infonnation will be submitted.
l As stated above, the requested information (a " written summary report") related to waterhammer and two-i l
phase flow conditions has been submitted previously to the NRC. The requested information related to thermally-induced overpressurization will be submitted. This submittal will describe our plans for long-term corrective action.
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i (3)
The requested information will be submitted within the 120-day requested time period.
l As stated above, the requested information related to waterhammer and two-phase flow conditions has been submitted previousiy to the NRC. The results ofthe evaluations and other requestedinformation related to thermally-induced overpressurization will be submitted within the 120-day requested time period.
t We would be pleased to answer any questions regarding the above information.
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Sincerely, l
l Bob ink Vice President Nuclear Power GDA Subscribed and sworn to before me this 3Y day of Sc4/c r 1996 ts u M1 a{)Public, State of Wisconsin My Commission expires p/R hc00
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l cc:
NRC Resident Inspector, NRC Regional Administrator-Region Ill
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