ML19257D796

Forwards Response to IE Bulletin 79-06C, Nuclear Incident at TMI - Suppl. Reactor Coolant Pumps Will Be Tripped After high-head Safety Injection Pump Operation Verified & Coolant Pressure Decreased

ML19257D796
Person / Time
Site:	Sequoyah
Issue date:	01/31/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	Rubenstein L Office of Nuclear Reactor Regulation
References
IEB-79-06C, IEB-79-6C, NUDOCS 8002060490
Download: ML19257D796 (2)

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TENNESSEE VALLEY AUTHORITY CH ATTANCOG A. TEN N ESSEE 3740t 400 Chestnut Street Tower II January 31, 1980 Director of Nuclear Reactor Regulation Attention: Mr. L. S. Rubenstein, Acting Chief Light Water Reactors Branch No. 4 Division of Project Management U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Rubenstein:

In the Matter of the Application of ) Docket Nos. 50-327 Tennessee Valley Authority ) 50-328 Enclosed for your information is TVA's position with respect to the short-term actions in item 1 of OIE Bulletin 79-06C.

Very truly yours, TENNESSEE VALLEY AUTHORITY

!"w{3 l'\ i f. 'g -;

L.'M. Mills, Manager Nuclear Regulation and Safety Enclosure

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OIE BULLETIN 79-06C RESPONSE 11EM 1 Short-Term Actions

1. In the interim, until the design change required by the long-term action of this bulletin has been incorporated, institute the follow-ing actions at your facilities.

A. Upon reactor trip and initiation of HPI caused by low reactor coolant system pressure, immediately trip all operating RCP's.

B. Provide two licensed operators in the control room at all times during operation to accomplish this action and other immediate and followup actions required during such an occurrence. For facilities with dual control rooms, a total of three licensed operators in the dual sontrol room at all times meets the requirements of this bulletin.

Response to Part A TVA is committed to trip the reactor coolant pumps at Sequoyah Nuclear Plant only af ter high head safety injecticn pump operation has been verified and the reactor coolant pressure has decreased below 1300 psig. This commitment is implemented in Sequoyah Nuclear Plant Emergency Operating Instruction (E01) 1, 2, and 3. TVA's position is based on the recommendations that Westinghouse Electric Corporation has transmitted to us and the inductry through the PWR Owners Group.

Response to Part B The licensed shif t crew in TVA plants consists of the following:

(1) a shift supervisor who has an SRO license and who has overall responsibility for the plant when higher level "in-line" management personnel are not present, (2) an assistant shift supervisor (with an Sa0 license) for each unit who has supervisory responsibility for all normal, abnormal, and emergency activities on his assigned unit, and (3) a unit opera?.or (with an R0 licnese) for each unit. Additionally, TVA is committed to one more licensed reactor operator (RO) than the aumber of licensed units.

The assistant shif t sunervisor's normal work station is in the control room, but F oeriodically makes inspections of plant equipment. He will immedi_;ely go to the control rocm during emergency situations.

TVA believes that each shift is adequately manned and fully capable of taking all necessary action during any transient event; the addition of another licensed operator and the requirement that this operator '

remain in the control room at all times is not warranted.

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