ML18142A694
| ML18142A694 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/15/1978 |
| From: | White L Rochester Gas & Electric Corp |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18142A694 (4) | |
Text
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
DISTRIBUTION FOR INCOMING MATERIAL 50-244 REC:
ZIEMANN D NRC ORG:
WHITE L D DQCDATE: 06/15/78 ROCHESTER GAS 5 ELEC DATE RCVD: 06/20/78 DOCTYPE:
LETTER NOTARIZED:
NO COPIES RECEIVED
SUBJECT:
LTR 1
ENCL 0
RESPONSE
TO NRC LTR DTD 09/02/77... FURNISHING INFO RE WATER HAMMER IN WESTINGHQUSE AND COMUBSTION ENGINEERING PRESSURIZED WATER REACTORS AND PLANS TO STUDY THE ADDITION OF "J" TUBES IN SUBJECT FACILITY"S STFAM GENERATOR FEED R INGS.
PLANT NAME:RE GINNA UNIT 1 REVIEWER INITIAL:
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'5A'IC ROCHESTER GAS AND ELECTRIC CORPORATION 89 EAST AVENUE, ROCHESTER, N.Y. 14649 LEON D. WHITE, JR.
VICE RRESIDEMT TELEP5IONE AREA CODE 7IS 546-2700 june 15, 1978 Director of Nuclear Reactor Regulation ATTN: Mr. D. Ziemann, Chief Operating Reactors Branch 42 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Subject:
Steam Generator water hammer prevention R. E. Ginna Nuclear Power Plant, Unit No.
Docket No. 50-244
Dear Mr. Ziemann:
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~ Cl5 IC This letter is in response to Mr. Schwencer's letter, dated September 2, 1977, regarding water hammer in Westinghouse and Combustion Engineering pressurized water reactors.
It also refers our letter of January 3, 1978 in which we stated our plans to study addition of "j" tubes in the Ginna steam generator feed rings.
to the Based on our review, it has been determined that the installation of "J" tubes willfurther reduce the probability of steam generator water hammers and we, therefore, are proceeding with plans to install "J" tubes during the 1979 refueling and maintenance outage.
Installation of "j" tubes willnot affect the integrity of the steam generator tubes.
A number of other factors also limit the likelihood of steam generator water hammers and the intensity of any postulated water hammers.
These have been outlined in our previous letters on this subject and include the limiting of auxiliary feedwater flow under normal conditions to less than 150 gpm, the short length of feedwater piping between the steam generator and the loop seal, and the automatic start of auxiliary feedwater on loss of all feedwater, loss of offsite power, low-low level in any one steam genera-tor, and safety injection.
The design of the "J" tubes including all design bases willbe reviewed pursuant to 10 CPR Section 50.59 when the design criteria are prepared.
It is our intention to design the modification such that all existing safety analyses are not affected.
Very truly yours,
", 7S f720 f55 L. D. Whit, Jr.
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