NUREG-0694, Advises That Augmented Natural Circulation Training Should Be Performed.Descriptions of Natural Circulation Tests Should Be Included in Fsar.Detailed Test Procedures Must Be Submitted 60 Days Prior to Scheduled Test Performance

Advises That Augmented Natural Circulation Training Should Be Performed.Descriptions of Natural Circulation Tests Should Be Included in Fsar.Detailed Test Procedures Must Be Submitted 60 Days Prior to Scheduled Test Performance

ML20126M431
Person / Time
Site:	Cherokee
Issue date:	06/12/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Dail L DUKE POWER CO.
References
RTR-NUREG-0694, RTR-NUREG-0737, TASK-1.G.1, TASK-TM NUDOCS 8106180128
Download: ML20126M431 (4)

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-I i e < h WUCLEAR MGULATORY CC0"J:33:CN usm scros. o, c. 2csss

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'+ s Docket Nos.: 50-491/493 Mr. L. C. Dail, Vice President Design Engineering .

Duke Power Company P. O. Box 33189 Charlotte, North Carolina 28242

SUBJECT:

TMI-2 ACTION PLAN ITEM I.G.1 - SPECI AL LOW POW NUREG-0737 " Clarification of TMI Action Plan Requirerents" and NUREG-0694 "TMI- Related Requirements for New Operating Licenses", Item I.G.1, calls for the impleaentation of "a special low power testing program approved by NRC to be conducted.at cower levels no greater than 5 percent for the -

purposes of providing meaningful technical information beyond that obtained .

in the normal startup test program and to provide supplemantal training".

Some PWR applicants have committed to a series of natur3l circulation tasts.

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To date such tests have been performed at the Sequoyah 1, North Anna 2, and Salem 2 facilities. Based on the success of the programs at these plants, the staff has concluded that augmented natural circulation This istraining should to be implemen-be perforned for all future PWR operating licenses.

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ted by including descriptions of natural circulation tests in your FSAR (Chapter 14 - Initial Test Program). If they are not aircady included in your FSAR, tne natural circulation tests and associated training should be included either by modifying existing or adding new test descriptions in accordance -

with Regulatory Guide 1.70, Paragraph 14.2.12. The tests should fulfill the following objectives:

Training Each licensed reactor operator (R0 or SRO uho performs R0 or SR0 duties, respectively) should participate in the initiation, maintenance Operators andto should be able recovery from natural circulation mode.

recognize when natural circulation has stabilized, and should be able to control saturation margin, RCS pressure, and heat removal rate without

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exceeding specified operating limits.

Testing lengtn ine tests shculd demonstrate the following plant characteristics:

j o' fime required to stabilize natural circulation, core flow distribution, ability to establian and maintain natural circulation with and without THIS DOCUMENT CONTAINS 8106180/X M POOR QUAUTY PAGES

JU'l 12 19C?

onsite and offsite power, the ability to uniformly borate and cool dcwn to hot shutdown conditions using natural circulation, and subcooling monitor performance.

If these tests have been performed at a comparable prototype plant, they need be repeated only to the extent necessary to acccmplish the above training cbjectives.

Procedure Validation _

The tests should make maximum practical use of written plant procedures to validate the ccapleteness and accuracy of the procedures.

The natural circulation tests require a source of actual or simulated decay haat. The tests may be performed during initial startup using nuclear heat to situlate decay heat, or may be performed later in the initial fuel cycle when actual decay heat is adequate to permit meaningful testing. If the test objectives are not ccapromised, pump heat during forced circulaticn c:eration could provide an acceptable source of simulated decay heat (e.g., the Loss-cf-Onsite and Offsite A/C Test performed at Mcrth Anna 2).

Applicants who perforn a natural circulation boron-mixing and cooldcun test to demonstrate compliance with Branch Technical Position RSS 5TP 5-1 may use that test to acccmplish some or all of the above training and testing cbjectivas.

This guidance is provided for all PWR OL applicants. pen atory Gui de 1.68 and/or the Standard Review Plan will be revised at a future date to include natural circulation testing and the associated % ning. OL 3;plicants sh:uld subit test descriotions in accordance with Regul: tcry Guf Ge 1.70, Paragraph la.2.12, as part of their FSAR or an amendment t' ereto. Detailed test peccHures should be made available for NRC review 60 days ,.,rior to scheduled test cerfor,ance (see Regulatory Guide 1.68, Appendix B). When required by 10 CFR 60.59, a safety analysis must be prepared and distributed in accorcance with the requirements l

stated therein.

1 Sincerely, i

1, f m G($

Robert L.5/ . Assistant Director 6edesco, l

' Vf for Licensi nc

\ Division of Licensing cc: See next page 1

" . C. 2 ail, ,i.n  % nen t

'J - . . ..

les ;a En;ineering

. . . . x. u. . t. .: 0 Ch -lo::e, North Carolina 25242

'alliam L. ?crter, Esq.

Associate General Counsel

.Y, r :X sv 2u esswao 3;ke Power Comoany Cnarlotte, North Carolina 28242

.'. Michael McGarry, III, Esq.

Debevoise & Lioerman 200 Seventeenth Street, N.W.

aasnington, D. C. 20035 William A. Raney, Jr. .

5:e:ial Duputy Attorney General

- P.G. Box 629 Ea eigh, North Carolina 27602 "ary A: erson Davis, Chairman YaMin River Cc=ittee R:ute 4, Scx 251

o:ksville, Nortn Carolina 27203

'illiam G. Pfefferkorn, Esq.

2124 Wachovia Building Winston-Salem, North Carolina 27101 4

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