ML19221A066
| ML19221A066 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/24/1979 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905190060 | |
| Download: ML19221A066 (3) | |
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MEMORANDUM TOR:
Victor Stello FROM:
fiRR Techni cal Review Group
SUBJECT:
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' ' SYSTEMS ANALYSES OF FIL LifJG AfiD GPERATl0f4
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We have ' reviewed the preliminary procedure of filling OTSG "B" solid with water and the conceptual transition of placing OTSG
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"S" in operation while the steam.ing OTSG
'A" would be converted to water solid operation.
Enclosed is our evaluation.
r7 YVM NRC Technical Review Group
Enclosure:
Uater Solid Filling ano Operatien of OTSG "B" cc w/ enclosure:
R. Mattson NRC Technical Group (4)
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WATER SOLID FILL I NG AND CPE ? Ail 0N OF STEAM GENE:J TO R B
P r e s c ri t leakage rates of the O TSG "B' tubes provides an oppartuni ty
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to. fill the D TSC. '.'B" wa t e r s o l i d.
Ve have reviewed draft procedures
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for this operation to see that p r ecaut ions woult' be taken to avoid water hammer in the steam line and any other adverse e f fect s.
We have not ident i fied any signi ficant risk with operation of OISC "B" in a wa t e r-s ol id mode.
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Ve support the procedure which suggest that p;ecautions be follo ed when filling the secondary side of OTSG 'B' slowly in order to avoid water hammer.
- a The steam line to'the isolation valves and the turbine bypass line to the turbine bypass control valve will be filled with water.
To avoid potential wate; oc =,e r, we recommend that the emergency steam generator feed pump be. secured.
The OTSG "B" cooling will be brought line by cracking open the turbine bypass valve.
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Once the steam generator "B" side ' filling process has been completed t rans ition will? take' place'to' fill steam generator "A" side water
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The l iceris ee has in formed us that during this transition, e
t he OTSG "B" fl ow rate will start and gradually increase while simultaneously the operating OTSG 'A" side wil? be controlled (by throtti.ing turbine valves) to decrease cooling.
Once the OT5G 'B'
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has taken 'p the full load,. O'TSG "A" will be isolated and filled u
water. solid by.the_ sane procedure foll owed wi th OTSG "B".
Ve agree
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with the above described concept, however, details of valve line up and checks for proper filling indications will be revie,ed as part of the s t a f f '~s revies of the operating procedure for entering this mode of operation.
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