ML19207A868
| ML19207A868 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 07/24/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Cousil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-08-01.A, TASK-RR NUDOCS 7908220529 | |
| Download: ML19207A868 (3) | |
Text
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g NUCLEAR REGULATORY COMMISSION 3
2l WASHINGTON, D. C. 20555 k. ** #
8 July 24,1979
+
Docket No. 50-213 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Company Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
We are continuing our review of your July 21, 1977 submittal related to the generic issue of onsite power systems and have found that additional infonnation is needed to continue our review. To maintain our review schedule we request your reply within 45 days of the date of this letter.
- incerely, O%
Dennis L. Ziemann, ef Operating Reactors ranch #2 Division of Operating Reactors
Enclosure:
Request for Additional Information cc w/ enclosure:
See next page
'i d.L $ 5 i 79082205#7
~
Mr. W. G. Counsil July 24,1979 cc Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Superintendent Haddam Neck Plant RFD #1 Post Office Box 127E
. East Hampton, Connecticut 06424 Mr. James R. Himmelwright
, Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Russell Library 119 Broad Street Middletown, Connecticut 06457
'ea11!38
ENCLOSURE Rf 00EST FOR ADDITIONAL INFORMATION MDDAM NECK DEGRADZG GRID' VOLTAGE 1.
Our position (i.e., of our letter of June 3,1977) is that the voltage monitors shall be designed to satisfy the requirements of IEEE Std. 279-1971, " Criteria for Protection Systems for Nuclear Power Generating Station." State your compliance with this position and include sufri-
'cient description for us to verify compliance of your design.
2.
CYAPCo letter dated July 21, 1977, states that the second level of voltage protection will only initiate the disconnection of the offsite power source when:
1.
the voltage level is below the setpoint of 3871 volts; 2.
the time delay of 9 + 1 seconds has timed out; and 3.
an accident signal is present.
It was 51so stated that operator action would be required to protect certain ESF loads (from degraded voltage) when an accident signal is not present.
Our position (1.d. of our letter of June 3,1977) is that the voltage monitors shall automatically initiatt the disconnection of offsite power sources whenever the voltage set point.and time delay -
limits have been exceeded.
We request that you propose a design description and schedule for installation of a modification to conform to our position and eliminate the need for operator action.
3.
Clarify the discrepancy in the two statements in your proposed Technical Specifications change regarding equipment capability-that of operating without damage at 3660 volts for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and that of the second level voltage protection set point of 3871 volts for 9 seconds.
'/81159