ML20150F067
| ML20150F067 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/29/1979 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904040163 | |
| Download: ML20150F067 (12) | |
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"' '#w"A"As"u'e!8" C o n.an at som March 29, 19H Mr. Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C. 20 S 5
Subject:
Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Dear Mr. ReL* t In our letter of Msrcia 21, 1979, we stated that it was our intent to submit, prior to March 30, 1979, the specific details concerning the modification to the CR #3 RC flow sensing system.
Attached please find forty (40) copies of our submittal describing the proposed modification to the RC flow sensing system that will satisfy the requirments of Condition 2.C.(7) of the CR #3 Operating License and your letter of March 12, 1979.
Please contact this of fice if you have any questions concerning the attached submittal.
Very truly yours,
FLORIDA POW R CORPORATION O
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W.P. Stewart WPSemhM10 D5 Attachment O
cc: File: 3-0-3-a-3 7so404D/O General Office 3201 Thirty fourtn street soutn. P.O. Box 14042. St. Petersburg, Florica 33733 e 813--866 5151
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s STATE OF FLORIDA COUNTY OF PINELLAS W.P. Stewart states that he is the Director, Power Production, of Florida Power Corporation; that he is authorized on the part of said company to sign and file with the Nuclear Regulatory Commission the information attached hereto; and that all such statements made and matters set forth therein are true and correct to the best of his knowledge, information and belief.
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W.P. Stewart Subscribed and sworn to before me, a Notary Public in and for the State and County above named, this 29th day of March,1979.
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2 sal / K Notary Publi(
Notary Public, State of Florida at Large, My Commission Expires: July 25, 1980 (Notary 1 D12)
REACTOR COOLANT FLOW REDUNDANT INSTRUMENT SENSING LINES Florida Power Corporation is in the process of preparing a design to implement the redundant flow instrument sensing lines to the Reactor Coolant System discussed in your letter of March 12, 1979. A sumary of the design is described below.
The present sensing lines tap into the flow meter pipe assembly with one inch pipe and two-one inch manual isolation valves. There is a short section of one inch pipe leaving the one inch isolation valves. The one inch pipe to one half inch tubing reduction occurs at the end of this short section of one inch pipe.
The new design begins at the point where the reduction begins. The one inch pipe will be cut just above the present point of reduction and a one inch by one inch by one inch tee will be welded in place. A short one inch section of pipe will be welded to the tee and then the one inch to one half inch reduction will be placed for each of the two connections from the tee.
This modification applies to both the high and low pressure connections.
Just downstream of each of the new reduction points, a one half inch manual shutoff valve will be installed. The present tubing run will be attached to one of these manual. shutoff valves and the new redundant sensing lines will be connected to the other new manual shutoff valve. This modification will be performed on both the high pressure and low pressure sensing lines. An additional one half inch tee, manual shutoff valve, short section of tubing and a cap are required in each of the new sensing lines near the new manual shutoff valves to permit the system to be vented when initially filling the system. Likewise, at the new transmitter locations, each new sensing line will require a tee, manual shutoff valve, shcrt section of tubing and a cap to permit these sensing lines to be filled or drained.
The new redundant one half inch sensing lines will be stainless steel material and seismically mounted at a distance from the existing sensing lines along the entire route to the new transmitter locations. The I,
1 distance between the sensing lines is such that any one comon occurrence 1
or event will not cause damage to the other sensing lines. The new redundant sensing lines and valves will meet the seismic and separation requirements of the Reactor Protection System.
The new location of the transmitters is about 50 to 75 feet away fran the i !
present location. The electrical circuits to these redundant transmitters will be seismically installed and the channel identities maintained in accordance with the requirements of the present Reactor Protection System.
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The attached figures one (1) through eight (8) show the proposed locations of transmitters, valves, and instrument sensing line routing. Figures one (1) and five (5) show the overall separation of redundant transmitter groups. The details of these instrument stations are shown on figures two (2), three (3), six (6), and seven (7). Figures four (4) and eight (8) show the piping taps from the flow measurement sensor through the two 1" isolation valves, the reduction from 1" pipe to 1/2" tubing, and the instrument sensing line isolation valves. All of these manual isolation i
Page 2 valves remain open during operation.- The normally closed valves shown on figures four (4) and eight (8) are for the initial filling of the sensing lines as are the' drain valves located at the low points near the transmitters shown on figures two (2), three (3), six (6), and seven (7).
Florida Power Corporation will perfom this modification as described herein during the first refueling outage scheduled to begin April 23, 1979.
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