ML19210D040
| ML19210D040 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck, Millstone File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 11/15/1979 |
| From: | Counsil W NORTHEAST UTILITIES |
| To: | Reid R, Ziemann D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19210D041 | List: |
| References | |
| TASK-07-03, TASK-08-02, TASK-7-3, TASK-8-2, TASK-RR TAC-12672, NUDOCS 7911200463 | |
| Download: ML19210D040 (2) | |
Text
,,
s NOtttHEAST trrILrrIES 5
Pj Cf.'l" ',:""'" "C--,
ggs *EcoNNECTICUT 06101 ro
- 'T:::::L?."'W:'"~
(m swsen L
L J :*7'.' R':2: = : =
November 15, 1979 Docket Nos. 50-213 50-245 50-336 Director of Nuclear Reactor Regulation Attn:
Mr. D. L. Ziemann, Chief Operating Reactors Branch #2 Mr. R. Reid, Chief Operating Reactors Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
References:
(1)
W. Gammill letter to All Power Reactor Licensees dated August 8, 1979.
(2)
D. C. Switzer letter to A. Schwencer dated September 30, 1976.
(3)
D. C. Switzer letter to A. Schwencer dated July 21, 1977.
(4)
W. G. Counsil letter to D. L. Ziemann and R. Reid dated September 27, 1979.
Gentlemen:
Haddam Neck Plant Millstone Nuclear Power Station, Unit Nos.1 and 2 Adequacy of Station Electric Distribution System Voltages In Reference (1), both Connecticut Yankee Atomic Power Company (CYAPCO) and Northeast Nuclear Energy Company (NNECO) were requested to review the adequacy of the offsite power supplies for the Haddam Neck Plant and Millstone Nuclear Power Station, respectively.
In Reference (4), CYAPCO and NNECO informed the NRC Staff that additional time would be required to formulate the responses requested by Reference (1) and that a response to Reference (1) would be submitted on or about November 15, 1979.
CYAPC0 hereby submits Attachment 1 in response to the Reference (1) requests.
NNECO hereby submits Attachments 2 and 3 for Millstone Unit Nos. 1 and 2, respectively, in response to the Reference (1) requests.
CYAPC0 has determined that the offsite power system and onsite distribution system are of sufficient capacity and capability to automatically start as well as operate all required safety loads within the conditions specified in7(l 2)h Reference (1).
1 79112 00 gf }
i
. The onsite distribution system supplied from the of fsite circuits has been tested. The results of these tests are presented in Table 1 of Attachment 1.
CYAPCO has reviewed the electric power systems of the naddam Neck Plant and has determined that violation of CDC-17 does not exist with regard to the simultaneous or consequential loss of both required circuits to the of fsite network.
NNECO has determined that the offsite power system and onsite distribution system for both Millstone Unit No.1 and Millstone Unit No. 2 are of suf ficient capacity and capability to automatically start as well as operate all required safety loads within the conditions specified in Reference (1). The onsite distribution system supplied from the offsite circuits has been tested for both units. The results of the tests are presented in Table 1 of Attachment 2 for Millstone Unit No. 1, and in Table 1 of Attachment 3 for Millstone Unit No. 2.
NNECO has reviewed the electric power systems of both Millstone Unit Nos.1 and 2 and has determined that no violation of GDC-17 exists in the design of either unit with regard to the simultaneous or consequential loss of both required circuits for each unit to the offsite network.
CYAPC0 and NNECO trust this information is responsive to the Reference (1) requests.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY NORTIIEAST NUCLEAR ENERGY COMPANY
}
a W. G. Counsil Vice President Attachments
'36?
220