ML20008F103
| ML20008F103 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/27/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| References | |
| TASK-06-07.B, TASK-6-7.B, TASK-RR LSO5-81-02-055, LSO5-81-2-55, NUDOCS 8103120269 | |
| Download: ML20008F103 (3) | |
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Dear Mr. Kay:
C'I 4 SUBJEET: SEP TOPIC VI-7.B., ESF SWITCH 0VER REQUEST FOR ADDITIONAL INFORMATION The enclosed request for additional information has been prepared as part of our evaluation of the ESF Switchover from Injection to Recirculation Modes at Yankee Rowe.
Because this concern is a part of a SEP Topic, response within 30 days is requested so that we maintain the present SEP review schedule.
Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing
Enclosure:
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FEE : 7 1931 Docket No. 50-29 L505-81-02-055 Mr. James A. Kay Senior Engineer - Licensing Yankee Atomic Electric Company 1671 Worcester Street Framingham, Mass. 01701
Dear Mr. Kay:
SUBJECT:
SEP TOPIC VI-7.B., ESF SWITCHOVER (YANKEE R0WE)
REQUEST FOR ADDITIONAL INFORMATION The enclosed request for additional information has been prepared as part of our evaluation of the ESF Switchuver from Injection to Recirculation Modes at Yankee Rowe.
Because this concern is a part of a SEP Topic, response within 30 days is requested so that we maintain the present SEP review schedule.
Sincerely, Dennis M, Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing
Enclosure:
As stated cc w/ enclosure:
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Mr. Janes A. Key cc Mr. James E. Tribble, President Yankee Atomic Electric Cocpany 26 Research Drive Westborough, Massachusetts 01581 Greenfield Community College 1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor One Ashburton Place Boston, Massachusetts 02108 Director, Criteria and Standards Division Office of Radiation Programs
'(ANR-460)
U. S. Environmental Protection Agency Washington, D. C.
20460 U. S. Environnental Protection Agency Region I Office ATTN: EIS COORDINATOR JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Yankee Rowe Nuclear Power Station c/o U.S. NRC Post Office Box 28 Monroe Bridge, Massachusetts 01350
REQUEST FOR ADDITIONAL INFORMATION ON SEP TOPIC VI-7.3 By text, P&ID, and electrical schematics; describe the design provisions and procedures used in your plant to satisfy the requirements of Branch Technical Position ICSB-20. The information provided should include, but need not be limited to, the following:
(1) Describe the procedures used to switchover from the injection to the recirculation mode of emergency core cooling (ECC).
(2) For each instrument,, indicator, logic device and alarm that is used by the operator to perform a manual function or that is used to initiate an automatic function in the switchover sequences descrioe how that device is qualified and installed (e.g.
independence and separation of circuits) as Class 1E equipment.
(3) Describe the level sensing system that is used to indicate or detect the level in the tank that supplies injection coolant. This description should include sensor and data column location, freeze protection, freeze protection power supply and those items specified in (2) above.
. (4) If injection pumps are not automatically tripped on low level, quantify the level at which the operator must secure these pumps and the time remaining beyond this level (assuming all pumps are running) at which loss
.of NPSH occurs.
(5) Describe the paths of the minimum flow lines from each ECCS pump discharge to the line end.
This description should identify all valv,es in these lines, the signals that control each valve, the power sources for each valve, and the qualification of each valve.
x (6) For each minimum flow line that returns to a point other than the pump intake point, provide a single failure analysis and quantify the
.offsite dose rate, dose, and dose assumptions obtaining from all single failures that do not isolate these lines during the recirculation phase of ECC.
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