ML19337A152

Submits Interim Actions for Plant Operation,Pending Final Resolution of Atws.Emergency Operation Procedural Review May Include NRC Site Visit Prior to Issuance of OL

ML19337A152
Person / Time
Site:	Cherokee
Issue date:	08/29/1980
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Dail L DUKE POWER CO.
References
NUDOCS 8009090037
Download: ML19337A152 (3)

Text

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NUCLEAR REGULATORY COMMISSION

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AUG 2 91980 Docket Nos.: STN 50-491, STN 50-492 and STN 50-493

. Duke Power Company ATTN: Mr. L. C. Dail, Vice President Design Engineering P. O. Box 33189 Charlotte, North Carolina 28242

SUBJECT:

INTERIM ACTIONS NEEDED FOR PLANT OPERATION PENDING FINAL RESOLUTION OF ANTICIPATED TRANSIENTS WITH FAILURE TO SCRAM (ATWS)

(COM USTION ENGINEERING PWR)

In December 1978 tha Nuclear Regulatory Commission (NRC) staff issued Volume 3 of NUREG-0460 which describes the proposed type of plant modifications the staff believes are necessary to reduce the risk from anticipated transients with failure to scram (ATWS) to an acceptable level. The NRC's Regulatory Requirements Review Comittee completed its review in January 1979, and concurred with the staff's approach described in Volume 3 of NUREG-0460, insofar as it applies to your plant.

The staff has issued requests for the industry to supply generic analyses to confirm the ATWS mitigation capability described in Volume 3 of NUREG-0460. Subsequently, the staff plans to present its recommendations for rulemaking on ATWS to the Comission. The Commission would, by rulemaking, determine the required modifications to resolve ATWS concerns and the required schedule for the implementation of such modificatio-s. Your plant would, of course, be subject to the Comission's decision in this matter.

Based on considerations described in pages 42 through 45, Volume 3 of NUREG-0460, the staff generally concluded that plants with operating licenses can continue to operate without undue risk to the health and safety of the public during the estimated 2 to 5 year period needed to implement the necessary modifications.

However, the staff believes the following steps should be taken as a prudent course prior to the issuance of an operating license in order to further reduce the risk from ATWS events during the interim period before the required plant inodifications as determined by the Comission are completed.

1.

An emergency operating procedure should be developed for an ATWS event, including consideration of scram indicators, rod position indicators, flux monitors, pressurizer level and pressure indicators, pressurizer relief valve and safety valve position indicators, coolant average temperature, containment temperature and pressure indicators, steam generator. level, pressure and flow indicators, and any other alarms 8009090037

o 2-annunciated in the control room including alarms not processed _through the. electrical portion of the reactor scram system. The emergency operating procedure should be sufficiently simplified and unambiguous to permit prompt ATWS recognition.

2.

The emergency operating procedure should describe actions to be taken in the event of an' ATWS including consideration of manually scramming the reactor. by using _the manual scram buttons, and prompt actuation of the auxiliary feedwater system. These actions must be taken immediately following the occurrence of the event. Actions should also include prompt initiation of boration by actuation of the high pressure safety injection system to bring the plart to a safe shutdown condition.

We require that you submit your ATWS imergency operating procedure for our review. Our review may include a visit to your plant to determine the feasibility of implementing your proposed procedures through operator simulation of the steps.. Our evaluation must conclude that an acceptable procedure and operator training are completed prior to the issuance of a full power operating license.

Sincerely, Robert L. Tedesco, Assistant Director for Licensing Division of Licensing cc: See next page

//

, Duke Power;Co.npany ll?

CCS:

'iillia i L. Port.er, Esq.

Associate General _ Counsel P. O. Sox'33139-Duke Power Coapany Charlotte, North Carolina 20242 J. Michael M:Garry, !!!, Esq.-

Debevoise & Liberuan 1200 Seventeenth Street, N.

W.'

Washington, D. C. 20036 Richard P. Wilson, Esq..

Assistant Attorney General S. C. Attorney General's Of fice

.P. O. Box 11549 Colu bia, South Carolina 29211 c

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