ML19221A602
| ML19221A602 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/24/1979 |
| From: | Novak T Office of Nuclear Reactor Regulation |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905230298 | |
| Download: ML19221A602 (3) | |
Text
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NUCLEAR REGULATORY COMMISSION WASHINGTON, o. C. 2055s
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- MEMORANDUM FOR:
Victor Stello FROM:
NRR Technical Review Group
SUBJECT:
SYSTEMS ANALYSES OF FILLING AND OPEPATION OF OTSG "B" WATER SOLID t!e have reviewed the preliminary procedure of fillino OTSG "B" i
solid with water and the conceotual transition of placing OTSG j
"B" in ope r ation while the steaming OTSG "A" would b'e converted to water solid operation.
Enclosed is cur evaluation.
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M NRC Technical Review Group Inclosure:
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'la t e r Solid Filling and i
Operation of OTSG "B" c: w/ enclosure:
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ita t t s on liRC Technical Group (4) t 165 275 7905230298
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UATER SOLID FILL ING AND OPERATION OF STEAM GENERATOR 'B '
Present leakage rates of the OTSG "B" tubes provides an opportunity to fill the OTSG "B" water solid.
Ve have reviewed draft procedures for this operation to see that precautions would be taken to avoid wa t e r hamme r in the steam line and any other adverse effects.
We have not identified any significant risk with operation of OTSG "B"
in a water solid mode.
Ve support the procedure which suggest that precautions be followed when filling the secondary side of OTSG "B" slywly in order to avoid water hammer.
The steam line to the isolation valves and the turbine bypass line to the turbine bypass cont rol valve will be filled with water.
To avoid ootential water hammer, we recommend that the emergency steam generator feed pump be secured.
The OTSG "B' cooling will be brought on line by cracking open the turbine bypass valvr.
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On;e the steam generator 'B" side filling process has been completed transition will take place to fill steam generator "A" side water solid.
The licensee has informed us that during this transition, e
the OTSG "B' flow rate will start and gradually increase while sinultaneously the operating OTSG "A" side will be controlled (by throttling turbine salves) to decrease cooling.
Once the OTSG "B"
has taken up the full inad, OTSG ' A" will be isolated and filled water solid by the sa e pro-edure f o l l o..e d w i t h O TSG " B".
We agree 165 276 0
4 with the above described concept, however, details of valve line up and cl.cks for proper filling indications will be reviewed as part of the staff's review of the operating procedure for entering this mode of operation.
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165 277
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