ML20041C371

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Provides Status of SIL 299 & SIL Suppl 1 Re Water Level Instrumentation
ML20041C371
Person / Time
Site: Browns Ferry  Tennessee Valley Authority icon.png
Issue date: 02/24/1982
From: Mills L
TENNESSEE VALLEY AUTHORITY
To: Harold Denton
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.2, TASK-TM GL-84-23, TAC-45116, TAC-45117, TAC-45118, NUDOCS 8203010228
Download: ML20041C371 (2)


Text

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, TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENN L_3SEE 374C1 400 Chestnut Street Tower II y '

February 24, 1982 d D Y Mr. Harold R. Denton, Director - b Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission h skQp Ta Washington, DC 20555 '

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Dear Mr. Denton:

In the Matter of the ) Docket Nos. 50-259 Tennessee Valley Authority ) 50-260 50-296 We were recently informed by the BWR Owners' Group of an NRC request for information concerning water level instrumentation. We understand that there is concern regarding the extent that the recommendations of Ceneral Electric SIL 299 and SIL supplement 1 have been addressed and implemented at each operating BWR plant.

The purpose of this letter is to provide the status of these SIL's at Browns Ferry Nuclear Plant.

Upon receipt of SIL 299, we performed a plant-specific review of our water level instrumentation and have taken the following actions on the SIL 299 recommendations.

1. Review of Level Trip Setpoints A design change request was initiated to raise the level trip setpoint from 378 inches to 407 inches above vessel zero for initiation of LPCI, core spray, diesel generators, and ADS permissive. This change is presently scheduled during the i first level switch calibrations following issuance of the approved final design package. We expect to complete this work by the end of 1982.
2. Provide Operators With Guidance We have modified our Emergency Operating Instructions (E0Is) to give the operator guidance for conditions that could cause water level inaccuracies. In addition, we are actively participating in the development of the symptomatic emergency procedure guidelines (EPGs) which also address the concerns of SIL 299 3 Modify Scale Readings in the Control Room We have modified the water level scales in the control room to make the operator aware of drywell temperature effects.

00l hlf9 B203010228 820224 An Equal Opportunity Employer r

PDR ADOCK 05000259 P _ _

PDR, _ __ __ _, __

Mr. Harold R. Denton February 24, 1982 We have also taken the following actions in regard to SIL 299 supplement 1.

1. We have reviewed and implemented as necessary the recommendations for SIL 299 as described above.
2. We have preliminarily reviewed the differential vertical lengths and have not identified any adverse safety concerns.

We are continuing to review this concern.

Very truly yours, TENNESSEE VALLEY AUTHORITY s .

L. . Mil s, ag r Nuclear Regulation and Safety Subscri'oed gwornto forej me this . day of Ats , 1982.

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cc: U.S. Nuclear Regulatory Commission Region II ATTN: James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 4

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