ML20210B028
| ML20210B028 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Catawba, McGuire, 05000000 |
| Issue date: | 02/02/1987 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 8702090060 | |
| Download: ML20210B028 (2) | |
Text
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. P DUKE POWER GOMPANY P.O. BOK 33189 CHAML& RTE, N.C. 98949 HALB."ICGKER m,m
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(704) 373-4531 February 2, 1987 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555
Subject:
McGuire Nuclear Station, Units 1 and 2 Docket Nos. 50-369 and 50-370 Catawba Nuclear Station, Units 1 and 2 Docket Nos. 50-413 and 50-414 Discretionary Enforcement Action Gentlemen:
This letter constitutes written followup of a request for temporary waiver of Technical Specification requirements which was made (and subsequently granted) via telecons between Duke Power Company (Duke) personnel and members of the NRC Staff on January 30, 1987. The temporary waiver for McGuire involved an extension until 2320 hours0.0269 days <br />0.644 hours <br />0.00384 weeks <br />8.8276e-4 months <br /> on January 30, 1987 for the time allowed under the ACTION statement of Technical Specification 3.0.3.
The temporary waiver for Catawba involved an extension until 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> for Unit I and 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br /> for Unit 2 on January 31, 1987 for the time required to be in Mode 4, Hot Shutdown, under the ACTION statement j
requirement of Technical Specification 3.0.3.
All four units were under the requirements of Technical Specification 3.0.3 and had declared Unusual Events at this time. Without the granting of the relief request, all four units would have had to have been placed in Mode 5, Cold Shutdown, within the following 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
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On January 14, 1987, Duke received notification from Mr. Virgil Brownlee, NRC/ Region II, that TVA had identified a problem with respect to their Containment 1
Air Return Fans. The TVA fans are located in pits without any drainage capability.
As such, should the pits fill up with water during a LOCA, the fans would fail.
On January 16, 1987, both McGuire and Catawba were notified of this problem and were directed to determine if the same condition existed at their plants. During this investigation, on January 30, 1987, McGuire personnel discovered that curbs had been removed from around the Containment Air Return Fan pits. These curbs are intended to preclude water from entering into the pits during a LOCA from the containment spray headers. Both McGuire units entered into ACTION statement 3.0.3 at 1420 hours0.0164 days <br />0.394 hours <br />0.00235 weeks <br />5.4031e-4 months <br /> that same day. McGuire Unit I was at 99% power and Unit 2 was at 57%
power at the time.
i Catawba personnel were made aware of the findings at McGuire and initiated an investigation. It was determined that both Catawba units also had no curbs around their fan pits. Both units at Catawba entered ACTION statement 3.0.3 at 1610 hours0.0186 days <br />0.447 hours <br />0.00266 weeks <br />6.12605e-4 months <br /> on January 30, 1987. Catawba Unit I was at 10p% power and Unit 2 was in Mode 3 at the time.
8702090060 870202" 0
gDR ADOCK 05000369 1 l i
U. S. Nuclocr Rrgulntary Commissien February 2, 1987 Page Two McGuire was able to replace the curbs and declare the fans operable for Unit 2 by 0020 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> and for Unit 1 by 0154 hours0.00178 days <br />0.0428 hours <br />2.546296e-4 weeks <br />5.8597e-5 months <br /> on January 31, 1987.
Catawba was able to install the curbs and declare the Unit I fans operable at 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br /> on January 31, 1987. The Unit 2 fans were declared operable at 1625 hours0.0188 days <br />0.451 hours <br />0.00269 weeks <br />6.183125e-4 months <br /> the same day.
Due to the low probability of the occurrence of a LOCA during the short period of time when the fans were technically inoperable, the health and safety of the public were not endangered. A detailed safety analysis of these events will be provided in the Licensee Event Reports for both McGuire and Catawba.
Very truly yours, 4
Hal B. Tucker RWO/08/sbn xc:
Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Dr. K. Jabbour Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Mr. Darl Hood Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 NRC Resident Inspector Catawba Nuclear Station Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station