ML20100H932
| ML20100H932 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/30/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8412100156 | |
| Download: ML20100H932 (2) | |
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DuxE power COMPANY j
P.O. DOX 33 tem)
CHAmLorFTE. N.O. 28942
~ HAL B. TUCKER Teteriums (704) 073-4838 ma ramassent November 30, 1984
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1 Mr. Harold R. Denton, Director i
Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Ms. E. G. Adensam, Chief Licensing. Branch No. 4 Re: Catawba Nuclear Station Docket Nos. 50-413 and 50-414'
Dear Mr. Denton:
i The following information is provided to assist the Staff in the Fire Protection review of the Catawba Nuclear Station.
Cold Shutdown Analysis confirms that cold shutdown can be achieved within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> following the subject event, under guidelines established by the Standard Review Plan, Section 9.5-1.C.5.C.
Damage Control Procedures and Operations Procedures have been developed to support this capability.
i T-Hot Indication in the SSF A concern has been raised that the instrumentation provided to the operator in
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the SSF should include indications of the Reactor Coolant System hot leg temperatures. These indications were determined to be unnecessary based on the following technical arguments.
The SSF instrumentation includes indications of the core exit fluid temperature as measured by the core exit thermocouples. These thermocouples essentially j
provide an early indication of the hot leg fluid temperature. Core exit thermocouples also provide the most direct and prompt indication of the status of core decay heat removal. Thermocouple performance has been proven during i
operation at the McGuire Nuclear Station, a sister plant to Catawba.
Should control and operation of the unit from the SSF be required, the reactor
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coolant pumps would not be in operation and core' cooling would be via natural circulation. The relatively low flow rates and long transport times of natural circulation cause the hot leg temperature to lag the core exit temperature. For this reason, the core exit thermocouples are used as the best indication of core cooling. ' Core exit thermocouple usage is extensive in both the Safety Parameter Display System (SPDS) and the station emergency procedures. Hot leg temperatures are not required to successfully control and operate the unit from the SSF.
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.Mr. Har:1d R. Dent:.a. Dir=t r November 30.-1984 Page Two Very truly yours, Ad Hal B. Tucker
.ROS: sib cc: Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 NRC Resident inspector Catawba Nuclear Station Mr. Robert Guild, Esq.
P. O. Box 12097 Charleston, South Carolina 29205 4
Palmetto Alliance 21351s Devine Street Columbia, South Carolina 29205 Mr. Jesse L. Riley Carolina Environmental Study Group
- 54 Henley Place Charlotte, North Carolina 28207 I
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