ML20028G167
| ML20028G167 | |
| Person / Time | |
|---|---|
| Site: | Clinch River |
| Issue date: | 02/04/1983 |
| From: | Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT |
| To: | Grace J Office of Nuclear Reactor Regulation |
| References | |
| HQ:S:83:208, NUDOCS 8302070477 | |
| Download: ML20028G167 (2) | |
Text
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~ O Department of Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:83:208 FEB 0 41983 Dr. J. Nelson Grace, Director CRBR Program Office
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Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Dr. Grace:
ADDITIONAL INFORMATION ON MITIGATION OF WATERHAMMER IN THE STEAM GENERATOR SYSTEM - CLINCH RIVER BREEDER REACTOR PLANT Enclosed is an amended Preliminary Safety Analysis Report (PSAR) page 5.5-12 that provider additional information concerning the considera-tions for waterhammei in the steam generator system. The enclosed page will be incorporated into the next amendment to the PSAR.
Questions regarding the enclosure may be addressed to Mr. D. Robinson (FTS 626-6098) of the Project Office Oak Ridge staff.
Sincerely, 9
John R. Longenecker Acting Director, Office of Breeder Demonstration Projects Office of Nuclear Energy Enclosure cc: Service List Standard Distribution Licensing Distribution l-Qoel 8302070477 830204
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PDRADOCK05000g A
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ENCLOSURE I
Functionally, the drum receives a saturated water / steam mixture f rom the evaporators and subcooled feedwater and produces saturated steam of low moisture content for the superheater and subcooled water of low steam content
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for the recirculation pump. The water / steam mixture from the evaporators enters the drum through the water / steam nozzles and flows into an annular volume along the sides of the inner drum wall created by a girth baf fle extending along the side of the drum for the length of the cylinder.
Centrif ugal steam separators mounted along the length of the drum draw from this annular volume, separate the mixture into phases, and direct the steam upward and the water downward into the inner volume of the drum.
The main feedwater enters the drum inrough a single nozzle which feeds two distribution pipes through a "Y" connection inside the drum.
The feedwater is distributed along the length of the drum by rows of orifice holes in the two pipes which are located along each side of the drum beneath the steam separators. The auxiliary feedwater enters through a separate nozzle and is distributed along the length of the drum by two rows of spray nozzles in a single distribution pipe located above the water level in the drum. To preclude waterhammer due to injection of highly subcooled water interf acing with saturated steam within a closed volume, the spray line is vented by the nozzles plus 18 7/32" OD hol es.
These vents ensure that the feed line will remain f ull of water at the temperature of the steam drum inventory.A Feedwater mixes wIth the water from
( the separators and is drawn downward and out through the water out,let nozzles by the recircul ation pump.
The steam passes upward through chevron type l
dryers In the upper portion of the drum and out through the steam outlet nozzles to the superheater. The dryers remove all but the last f ractional percent of the moisture from the steam and drain this moisture back to mix with the resident drum water.
Drum drain piping, located along either sido of the drum in the region where the water from the separators enters the drum
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Inner volume, draws water of high impurity concentration f rom the drum.
5.5.2.4 Overoressure Protection Location of Pressure ReIIef Devices Safety / power rel lef valves are located in the steam generation system to:
1.
Prevent a sustained pressure rise of more than 10 percent above system design pressure at the design temperature wIthin the pressure boundary of the system protected by the valve under any pressure transients anticipated; and 2.
Provide stern generator module blowdown capabil Ity.
InstalIation of the valves wIII comply with the requirements as spectfled in Section 3.9.2.5.
Saf ety/ power rel ief val ves are installed on the outlet l ines f rom each evaporator to provide venting capability and a portion of the j
required safety /rel lef capabil ity.
Saf ety valves are installed on the steam i
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/ds (eg., s.A rehda Mddr MI"& ke# ** Add ~~~0 (Q *, be accepMe.
5.5-12 Amend. 72 Oct. 1982