ML20247Q486
| ML20247Q486 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 06/01/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-17, TXX-89282, NUDOCS 8906060440 | |
| Download: ML20247Q486 (3) | |
Text
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Log # -TXX-89282 File # 10035
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Ref. # 10CFR50.34(b) c.
1UELECTRIC June 1, 1989 NebuS$ansen U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. -20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 and 50-446 UPDATED RESPONSE TO GENERIC LETTER 88-17 REF:
TU Electric letter TXX-89041 from William J. Cahill, Jr.
to the U.S.N.R.C dated February 10, 1989 Gentlemen:
The referenced letter provided the CPSES response to Generic Letter 88-17. At the time of the response, a study was underway to evaluate options regarding the two independent Reactor Coolant System level indications recommended by the Generic Letter.
In the response, TV Electric committed to providing a description of the level instrumentation by June 1,1989, af ter completion of the study.-
The level instrumentation study has been completed. The level indication
. system selected consists of'two independent differential pressure transmitters; one narrow range (30 inch span) and one wide range (150 inch span). The high pressure sensing line for each transmitter is tied into a separate flux thimble guide tube with a tee connection. A standpipe is installed in each' sensing line with a minimum height well above the maximum transmitter range. The water level in the standpipes provides the high
' pressure input to each transmitter. Both the high pressure standpipes and the low pressure' sides are vented to containment atmosphere as is the Reactor Coolant System (RCS). This configuration provides physical independence between the two indicators.
The 30 inch span of the narrow range indicator envelopes the 29 inch inside diameter of the RCS hot legs, and yields higher accuracy and readability due to its smaller span. The 150 inch span of the wide range indicator extends from below the bottom of the RCS hot legs to above the Reactor Vessel (RV) fl ange. This permits tracking of RCS level from the RV flange elevation through reduced inventory operation (three feet below the RV flange) into mid loop operation, where the narrow range indicator will be on scale.
091 8906060440 890601 1
ADOCK0500gj5 FDR 400 North Olive Street LB81 Dallas, Texas 75201
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TXX-89282 June 1,1989 Page 2 of 2-Each level transmitter provides level indication on the RHR portion of. the control board.
Low level alarms are provided in the control room to alert the operator of the potential for excessive RHR pump air entrainment.
Sincerely, J
William J. Cahill, Jr.
BSD/bsd Attachment c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3)
l Attachment to TXX-89232 June 1, 1989 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
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Texas Utilities Electric Company
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Docket Nos. 50-445
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50-446 (Comanche Peak Steam Electric
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Station, Units 1 & 2)
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AFFIDAVIT William J. Cahill, Jr. being duly sworn, hereby deposes and says that he is Executive Vice President, Nuclear of TU Electric, the Applicant herein; that he is duly authorized to sign and file with the Nuclear Regulatory Commission this update to Generic Letter 88-17; that he is familiar with the content thereof; and that the matters set forth therein are true and correct to the best of his knowledge, information and belief.
i William J. CahM1, Jr.
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Executive Vice President, & clear STATE OF TEXAS
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Notary Seal COUNTY OF D Arthu.,)
Subscribed and sworn to before me, a Notary Public in and for
.___on this Jln day of 414 V
, 1989.
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My commission expires:
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