ML19317D551
| ML19317D551 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 10/04/1976 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7912060798 | |
| Download: ML19317D551 (2) | |
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OCT 4 E76 DISTRIBUTION DocketFiles(3)
NRC PDRs LOCAL PRDR Dockets 14os.
0-ORB #1 Reading 50-270 ASchwencer and 50-287 DNeighbors SMSheppard TBAbernathy JRBuchanan Duke Power Company ATTN: Mr. William O. Parker,Jr.
OELD Vice President OI&E(3)
Steam Production ACRS(16)
VSTello Post Office Box 2178 DEisenhut 422 South Church Street KRGoller Charlotte, North Carolina 28242 TJCarter Gentlemen:
By letter dated August 6,1976, you submitted an evaluation titled
" Evaluation of the Post-LOCA Boric Acid Concentration Control System for Oconee Reactors." This evaluation provided a description of the boron dilution system and discussed the need for flow instrumentation and an assessment of the functional performance of the system.
You concluded that flow indication is not necessary.
We have reviewed your submittal and our review of the modifications to the drain line indicates that the resulting system has sufficient redundancy to be. single failure proof, and, therefore is acceptable.
We have concluded, however, that our previous position, as stated in our February 17, 1976, letter should be maintained, i.e., that a positive indication that flow exists in the drain network from the hot leg is required to assure that boron dilution flow can be main-tained. The flow indication requirement applies to Oconee Units 1, 2 and 3.
It is requested that you commit, by letter to us M thin 14 days to install instrumentation for positive flow indication in each of the three Oconee Units at the following refueling outages; Unit 1, Cycle 4, Unit 2, Cycle 3 and Unit 3. Cycle 3.
It is understood from your August 6,1976 letter that you will perform functional tests on the boron dilution system being installed on Oconee 3 during the impending refueling outage as you did for Ltits 1 & 2.
Sincerely,
.pngnal signed by A. Schwencer, Chief Operating Reactors Branch #1 t
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2-October 4,1976 cc: tir. William L. Porter Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, florth Carolina 28242 Mr. Troy B. Conner Conner & Knotts 1747 Pennsylvania Avenue,fl. W.
Washington, D. C.
20006 Oconee Public Library 201 South Spring Street Walhalla, South Carolina 29691 i
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