ML17275A570

Lists Steps to Be Taken Prior to OL Issuance to Further Reduce Risk from ATWS Events During Interim Period Before Plant Mods Determined by Commission Are Completed.Atws Emergency Operating Procedure Must Be Submitted for Review

ML17275A570
Person / Time
Site:	Columbia
Issue date:	08/29/1980
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Strand N WASHINGTON PUBLIC POWER SUPPLY SYSTEM
References
NUDOCS 8009090103
Download: ML17275A570 (6)

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JYoungblood NSIC DLynch TIC Washington public Power Supply System MRushbrook ATTN:

Mr; Neil 0. Strand PCheck Managing Director LRubenstein 3000 George Washington Way ASchwencer P. 0.

Box 968 JMiller Richland, Washington 99352 RVollmer DRoss

Dear Mr. Strand:

RMattson JKnight

SUBJECT:

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

(GENERAL ELECTRIC BWR)

Docket No.:

50-397 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, in addition to our licensing requirement for a recirculation pump trip to mitigate the short-term consequences of ATWS events, 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 modifications as determined by the Commission are completed.

In December 1978, the 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 Committee 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 Cotmission.

The Commission would, by rulemaking, determine the required modifications to resolve ATWS concerns and the required schedule for the implementation of such modifications.

Your plant would of

course, be subject to the Commission's decision in this matter.

80I70 /&g OFFICE SURNAME DATEI NRC FORM 318 (9 76) NRCM'0240 AUD:GOVERNMENT, PRINTING OFFICE: 1979'289'369 P

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An emergency operating procedure should be developed for an ASS event, including consideration of scram indfcators, rod position indicators, average power range flux monitors, (APRN), reactor vessel level and pressure indicators, relief valve and isolation valve indicators, and containment temperature, pressure and radiation indicators.

The emergency operating procedure should be sufficiently simple and unambiguous to permit prompt operator recognition of an ATNS event.

2.

The emergency operating procedure should describe actions to be taken fn the event of an ATMS including consideration of manually scrammfng the reactor by using the manual scram buttons followed by changing the operation mode switch to the shutdown position, stripping the feeder breakers on the reactor protection system po>ger distribution buses, scramming individual control rods from the back of the control room panel, tripping breakers from plant auxiliary power source feeding the reactor protection system, and valving out and bleeding off instrument air to scram solenoid valves.

These actions must be taken fmnedfately after detection of an ATMS eveht.

Actions should also include prompt initiation of the residual heat removal system fn the suppression pool cooling mode to reduce the severity of the containment conditions; and actuation of the standby liquid control system if a scram cannot be made to occur.

Early operator action as described above, in conjunction with a recirculation pump trip, would provide sfgniffcant protection for some ATMS events, namely those which occur {1) as a result of comon mode failure in the electrical portion of the scram system and some portions of the drfve system, and (2) at low power levels where the existing standby liquid control system capability is sufficient to limit the pool temperature rise to an acceptable level.

Me require that you submit your A'NS emergency operating procedure for our review.

Our review may fnclude a visit to your plant to determfne 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.

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See next page Sincerely, Original sIgned by Robert.L. Tedesoo Rober t L. Tedesco, Assistant Director f'r Licensing Division of Licensing DL:LB OFFICE SURNAME GATE)

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Washington Public Power Supply System ccs:

Joseph B. Knotts, Jr.,

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Debevoise

& Liberman 1200 Seventeenth

Street, N.

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Washington,, D. C. 20036

," Richard g. guigley, Esq.

~ Washington Public Power Supply System P. 0.

Box 968 Richland', Washington 99352

.~'" Nicholas Lewis, Chairman Energy Facility Site Evaluation Council 820 East Fifth Avenue Olympia, Washington 98504 Mr. 0. K. Earle Licensing Engineer P. 0.

Box 968 Richland, Washington 99352

.',~ Resident inspector/'HPPSS-2 NPS

,;", c/o U.S. Nuclear Regulatory Coomfssion

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Box 69 Richland, Washington 99352 I

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