ML20024B785
| ML20024B785 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 07/06/1983 |
| From: | Garrity J Maine Yankee |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| JHG-83-167, MN-83-140, NUDOCS 8307110378 | |
| Download: ML20024B785 (2) | |
Text
.-
p MAME '"9HARHEE Aloml0 Pol'HRCOMPARU*
,uaugr,?li?u?g%
k (207) 623-3521
_e July 6, 1983 M-83-140 JHG-83-167 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention: Mr. Robert A. Clark, Chief Operating Reactors Branch No. 3 Division of Licensing
Reference:
(a) License No. DPR-36 (Docket No. 50-309)
(b) USNRC Letter to MYAPCo dated April 24, 1980 (c) USNRC Letter to MYAPCo dated March 1,1983
Subject:
Technical Specifications for Pressurizer Heaters
Dear Sir:
In Reference (c), the staff requested that Maine Yankee review the need for a more complete technical specification that includes the pressurizer heater capacity. We have reviewed the staff's concerns and have concluded that a revision to the technical specifications is not necessary. Our reasoning follows.
The reactor coolant system (RCS) temperature and pressure relationship and the heatup/cooldown rates are required to be maintained in accordance with technical specifications. Reactor coolant system pressure can be maintained by utilizing either a main or an auxiliary charging pump, the pressurizer heaters or any combination thereof. The main charging pumps double as high pressure safety injection pumps with technical specification operability requirements.
There are two banks of proportional heaters, each having 150 kW of heater capacity powered from the 480 volt emergency buses. The remaining banks of heaters are on/off control type and are used as backups. They are powered by the six remaining 480 volt buses. If needed, the operators can energize non-emergency buses from the emergency buses and energize additional pressurizar heaters as necessary to maintain pressure. Therefore, we have concluded that adequate heater capacity capable of being powered from emergency buses would always be available.
Eo\\
e307110378 830706 j
1142L-SEN DR ADDCK 05000 0 0
~
+
MAINE YON 3'CE ATOMIC POWER COMPANY
~
se s
o' United States Nuclear Regulatory Commission ~'
July 5, 1983 Attention: Mr. Rccert A. Clark, Chief Page Two M.
o This ability to power heaters from the emergency buses as necessary, coupled with the option of using main or auxiliary charging pumps provides the necessary assurance that pressure can be maintained and controlled by the operators.
' We trust this information.is responsive to your concern. Please feel free to contact us if you have additional questions.
Very.truly yours, MAINE YANKEE ATOMIC POWER C0 WANY John H. Garrity, Senior Director Nuclear Engineering and Licensing JHG:pjp cc: Dr. Thomas E. Murley Mr. Paul D. Swetland s
9 ll42L-SEN
_...