ML19221A424
| ML19221A424 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/24/1979 |
| From: | Capodanno G GENERAL PUBLIC UTILITIES CORP. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19221A425 | List: |
| References | |
| TSG-095, TSG-95, NUDOCS 7905230006 | |
| Download: ML19221A424 (2) | |
Text
'
W 24 E Inter-Office Memorandum
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Ca:
April 24, 1979
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TMI-2 MODIFICATION CRITERLA FOR USE OF b
d S c ect STEAM GENERATORS FOR LONG TERM COOLDOW 7
(REV.3) j W.
R.
COBEAN (B&R)
Loceon
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To
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R.
RODGERS (CAI) w 4
Attached are revised criteria for use in designing plant modifications to use the "A" and "B" steam generators as high pressure water to water hea t exchangers for decay heat removal.
The following significant changes' have been made from Revision 2:
a.
The "short term" low pressure criteria have been deleted for both steam generators due to lack of schedule advantage over the long term high pressure design approach.
b.
The "A" steam generator criteria includes sketches for a feed to river water exchanger and for a feed to closed cooling water heat exchanger.
The feed to river water scheme is preferred if a suitable heat exchanger is located.
Electrical reqqirements have been specified.
These include physical and c.
electrical separation between A and B stea= generator cooldo'-n syste=s, capt.bility to operate from an one-site uiesel generator set and non-class lE classification.
- d. Instrumentation and control requirements have been expanded.
New require-ments include separation, radia~ tion moni toring on the closed cooling water outlet of the heat exchanger as well as the outlet of the steam generator, and provisions for future control roca controls and indicators.
/dditional requirements have been added regarding control of system Icakage, e.
control at low feedwater flows and system makeup requirements.
In order to minimize the impact of the installation of these systems on plant operation, it is necessary that tie ins for both the "A" and "B" generators be made at the same time.
Tie in to the "A" generator feedwater system will require steaming with emergency feedwater during the interval that normal feedwater is disabled.
A similar situation applies for cutting the cross connert between the "A" and "3" f eed trains at the 6.\\ and 6B feedwater heaters.
Per a =eeting this date (4/23/79) between B6R, GAI, GPU Pullman-Rellogg j
and Catalytic, it was agreea that the tie in spools for both the "A" and "B" generators were to receive top priority for f abrication and installat on
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GPU Serwce Corporahon is a subsd.ary cf General Putmc UMhes Corocrancn
W.
R.
Cobean TMI-2 Modification Criteria for Use of R.
Rodgers Steam Generators for Long Term Cooldown (Rev.3)
Page 2 Also per discussion between the writer and W. R.
Cobean, it has been agreed that B6R will engineer the el?ctrical work for a "A" generator scheme and will provide tie in points for CAI to use the in-plant condensate polishers (should it be decided to use the polishers).
I AN f
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(pr G.
Capodanno A j
GC: keg CC:
R.
F. Wilson D.
K.
Croneberger D.
G.
Slear T. Novak (8) - NRC L. Harding R.
W. Keaten T. G. Brought,on G.
R. Troffer R. Karren (6) - Met-Ed J. McMillan - 36W R.
E. Allen - GPU, Reading L. L. Haman - GAI Modification Criteria File s
162 185
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