ML20090B522

Discusses Licensee 820211 Telcon Requesting Relief from 5% Margin Imposed for Average Power Range Monitor Flux Noise & Core Plate Delta Noise.Proposed Method Acceptable

ML20090B522
Person / Time
Site:	05000000, Cooper
Issue date:	06/08/1982
From:	Speis T Office of Nuclear Reactor Regulation
To:	Novak T Office of Nuclear Reactor Regulation
Shared Package
ML17139C189	List: ML20090A661 ML20090A666 ML20090A681 ML20090A687 ML20090A754 ML20090B244 ML20090B269 ML20090B522 ML20090B617 ML20090B711 ML20090B723 ML20090E718 ML20090G556 ML20090G651 ML20090H476 ML20090H564 ML20091K497 ML20091K517 ML20091K531 ML20091K537 ML20091K546 ML20091K565 ML20091K568 ML20091K579 ML20091K592 ML20091K640 ML20091K652 ML20091K658 ML20091K681 ML20091K683 ML20091K686 ML20091K733 ML20091K752 ML20091K761 ML20091K766 ML20091K782 ML20091K786 ML20091K791 ML20091K800 ML20091K807 ML20091K822 ML20091K892 ML20091K928
References
FOIA-84-105 NUDOCS 8206170023
Download: ML20090B522 (2)

Text

-

/

9.-n -

pa Cec UNITED STATES o

NUCLEAR REGULATORY COMM!sSION y,

g i

{ g, 47 g

WASHINGTON, D. C. 20555 s"

I

\\,+

./

Docket No. ::0-298 IN MEMORANDUM FOR:

Thema N. Novak, Assistant Director for Operating Reactors, DL FROM:

Themis P. Speis, Assistant Director for Reactor Safety, DSI

SUBJECT:

COOPER NUCLEAR STATION SINGLE LOOP OPERATION, NEBRASKA PUBLIC POWER DISTRICT Plant Name:

Cooper Nuclear Station Docket Number:

50-298 NSSS Supplier:

General Electric Responsible Branch: ORB-2 Project Manager; B. L. Siegel Review Status:

Complete TAC Number:

42418 Cooper SER for Single Loop Operation (SLO) with power operation limited to 50%

wc; issued on December 10, 1981.

The following requirements were among the conditions for SLO.

a) APRM flux noise will be measured once per shift and the recirculation pump speed will be reduced if the flux noise e.<.ceeds 5-percent peak to peak.

b) The core plate delta noise be measured once per shift and the recirculation pump speed will be ec:.ced if the noise exceeds 1 psi peak to peak.

The staff requires that the licensee perform daily surveillance on the jet pumps to ensure that the pressure drop for cne jet pump in a loop does not vary from the mean of all jet pumps in that loop by more than 5%.

The above requirements were imposed based on SLO experience of other BWRs especially Browns Ferry-l. But the licensee (Nebraska Public Power District) during a tele-conference on February 11, 1982 has indicated that the operating margins we imposed for ApRM flux noise and core plate delta noise are too stringent and too difficult to conform during SLO. The. licensee requested relief from the 5% margin we specified..The licensee proposed that they will monitor the noises at about 40% of power for a reasonable time period of 1/2 hour to I hour and the cperating margin they get will be increased by a maximum of 50% to get the allowable margin at 50T, power.

p1 L

JOH B GE The noise levels at reoper during SLO may not be same as other BWRs, and it

-may vary during different power and flow conditions. We believe the proposed method to determine the operating margins for the flux nosie and core plate delta. noise during SLO give sufficient conservatism to satisfy our BF-1 concerns

.hence is acceptable. The licensee may be informed accordingly.

Themis P. Speis, Assistant Director for Reactor Safety, DSI cc:

B. Siegel

.D. Vassallo R. Clark C. Berlinger RSB Section Leaders RSB Section B Members G. Thomas

+

.O

.2

.