ML19275A445
| ML19275A445 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 09/12/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| TASK-05-13, TASK-5-13, TASK-RR NUDOCS 7910040415 | |
| Download: ML19275A445 (3) | |
Text
u ppArco fs
[o UNITED sTATds g
.y h e 3 g NUCLEAR REGULATORY COMMISSION r,, g Wg/
E WASHINGTON, D. C. 20555 QCM September 12, 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-RE:
STEAM GENERATOR WATER HAMMER - HADDAM NECK In response to our letter of September 2,1977, regarding steam generator water hammer at Haddam Neck you indicated that, based on your operating experience, modifications were not necessary to further reduce the proba-bility or consequences of steam generator water hammer at your facility.
Although your operating history does not show that such water hammer has occurred in your present piping arrangement, we require further assurance that steam generator water hammer will not occur in the future and that surveillance procedures would be adequate to detect water hammer or damage from water hammer if it were to occur.
Your response to the enclosed request for additional infonnation, together with previously supplied infonnation, will provide a bases for a detennination regarding the need for modifications to your feedwater system to prevent steam generator water hammer.
Your response is needed within 60 days so that we may maintain our schedule for evaluating the potential for water
~
hammer at your facility.
Si ncerely,
@w Dennis L. Zieman., Chief Operating Reactors Branch #2 Division of Operating Reactors
Enclosure:
Request for Additional Infomation 1095 284 cc w/ enclosure:
See next page t9100409/5+
s Mr. M. G. Counsil September 12, 1979 cc w/ enclosure:
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 O
e
!095 285 e
REQUEST FOR ADDITIONAL INFORMATION h
I ON STEAM GENERATOR WATER HAMMER HADDAM NECK DOCKET N0. 50-213 1.
Provide infonnation that demonstrates that the feedwater system and steam generator water level at your facility have been subjected to those transient conditions that are conducive to water hamer, i.e., the addition of cold feedwater or auxiliary feedwater to steam-filled feedwater piping and feedring.
See NUREG 0291 Page 4 that was forwarded to you on September 2,.377.
Include the following:
o 1.1 Describe the expected behavior of steam generator water level as a result of reactor trip from power levels greater than 30*; of full power.
Include actual plant measurements of steam generator ievel and other available related data such as feedwater flow and auxiliary feedwat-r flow.
1.2 Provide the number and causes of loss of fredwater events during the operational history of the plant.
You may refer to material submitted previously.
1.3 Provide the number and causes of loss of off-site power events during tre operational history of the plant.
2.
If administrative controls have been adopted to limit the flow of auxiliary feedwater for the purpose of reducing the probability of water hamer, show when they were adopted and give the answers to items 1.1,1.2 and 1.3 for before and after such controls were established.
1.0 5
286 3.
If administrative cont:ols have been adopted to limit the flow of auxiliary feedwater for the purpose of reducing the probability of water hamer, show that an adequate water inventory and f. low will be maintained to accomodate all postulated transient and accident conditions.
4.
If auxiliary feedwater flow in your facility is not at present initiated automatically for normal and accident events, present your evaluation of whether automating the actuation of auxiliary feedwater might increase the probability of inducing steam generator water hammer.
One of the signals that would automatically initiate the flow of auxiliary feedwater would be the steam generator low water level.
This set point should be above the top of the m:in feedwater sparger to reduce the probability of steam generator water hammer.
5.
Describe the means that will be used to monitor for the occurrence of steam generator water hammer and possible damage from such an event.
Include all instrumentation that will be employed.
Dcscribe the inspections that will be perfcmed and give the frecuency of such inspections.
5.
Describe the reporting procedures nat will be. used to cocument and repcrt water hammer and damage to piping and Diping support systems.
Ocr re: orts were recuested in our letter tc you dated September 2, 1977.