ST-HL-AE-2692, Forwards Unreviewed Safety Question Evaluation 88-085 Re Initial Startup Test 24, Loss of Offsite Power Test. Procedure Changed to Allow Reactor Trip to Be Initiated as Result of Loss of Offsite Power

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Forwards Unreviewed Safety Question Evaluation 88-085 Re Initial Startup Test 24, Loss of Offsite Power Test. Procedure Changed to Allow Reactor Trip to Be Initiated as Result of Loss of Offsite Power
ML20195G692
Person / Time
Site: South Texas STP Nuclear Operating Company icon.png
Issue date: 06/20/1988
From: Mcburnett M
HOUSTON LIGHTING & POWER CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
ST-HL-AE-2692, NUDOCS 8806280102
Download: ML20195G692 (4)


Text

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The Light a:esarra p >' P.O. Box 1700 llouston, Texas 77001 (713) 228 9211 flouston Lighting & Power . . . . . - ..

June 20, 1988 ST-HL-AE-2692 File No.: G20.01 10CFR50.59 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Generating Station Unit 1 Docket No. STN 50-498 Revision to FSAR Section 14.2:

Initial Startup Test #24, "Loss of Offsite Power (LOOP) Test" Pursuant to license condition 2.C(4) of Facility Operating License No.

NPF-76, Houston Lighting & Power Company (HL&P) submits the attached description of a change in the South Texas Projec Electric Generating Station (STPEGS) Initial Test Program. The description addresses a change in the method of Initial Startup Test #24, "Less of Offsite Power (LOOP) Test."

By letter dated November 20, 1987, HL&P provide.' a description of the LOOP test to be performed as part of the Initial Startup Test Program. The description states that the reactor is to be manually tripped prior to initiation of loss of offsite power. The procedure has been changed to allow reactor trip to be initiated as a result of the loss of offsite power. The change enables the test to be conducted under conditions similar to those of an actual event.

There are no unreviewed safety questions associated with this change.

The change will be incorporated in a future FSAR amendment.

, If you should have any questions on this matter, please contact me at l (512) 972-8530.

6806200102 880620 kk bl- t%f h PDR ADOCK 0F0004(78 M. A. McBurnett P PDR Manager Operations Support Licensing PLW/nl

Attachment:

Unreviewed Safety Question Evaluation 88-085.

Ir.itial Startup Test #24, "Loss of Offsite Power (LOOP) Test" 0[0 t\

A Subsidiary of liouston Industries Incorporated NL.88.160.02

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flouston Lighting & l'ower Company 3,

ST-HL-AE-2692 File No.:G20.01 Page 2 CCI Regional Administrator,-Region IV Rufus S. Scott Nuclear. Regulatory Commission Associated General Counsel 611 Ryan Plaza Drive, Suite 1000 ~ Houston Lighting & Power Company Arlington, TX 76011 P. O. Box 1700 Houston, TX 77001 George Dick' U. S. Nuclear Regulatory Commission INP3 Washington, DC 20555 Records Center 1100 Circle 75 Parkway Jack E. Bess Atlanta, Ga. 30339-3064 Resident Inspector / Operations c/o U. S. Nuclear Regulatory Commission Dr. Joseph H. Hendrie P.'O. Box.910 50 Be11 port Lane Bay City, TX 77414 Be11 port, NY- 11713 Don L. Garrison Resident Inspector / Construction c/o U. S. Nuclear Regulatory Commission P. O. Box 910 Bay City, TX 77414

'J. R. Newman, Esquire Newman & Holtzinger, P.C.

'1615 L Street, N.W.

Washington, DC 20036 R. L. Range /R. P. Verret Central Power & Light Company P. O. Box 2121 Corpus Christi, TX 78403 R.' John Miner (2 copies)

Chief Operating Officer L City of Austin Electric Utility 721 Barton Springs Road Austin, TX 78704 R. J. Costello/M. T. Hardt City _Public Service Board P. O. Box 1771 San Antonio, TX 78296 i

Revised 06/1J/88 NL.DIST

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~ llouston Lighting & Power Company L ST-HL-AE-2692 File No G20.01 10CFR50.59 Unreviewed Safety Question Evaluation #88-085 Subj ect : Initial Startup Test #24, "Loss of Offsite Power (LOOP) Test"

Description:

By letter dated November 20, 1987, Houston Lighting & Power Company provided a description of the LOOP test to be performed as part of the Initial Startup Test Program. The description states that the. reactor is to be manually tripped prior to initiation of loss of offsite power. The procedure has been changed to allow reactor trip to be initiated as a result of the loss of offsite power. The change enables the test to be conducted under conditions similar to those of an actual event.

Safety Evaluation:

1) Does the subject of this evaluation increase the probability of occurrence or the consequences of an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report?

Loss of offsite power is addressed in STPEGS FSAR Section 15.2.6.

This accident analysis assumes that reactor trip occurs as a result of the loss of offsite power. Conducting the test by initiating loss of offsite power first, and having reactor trip follow, as prescribed by the revised test description is consistent with the assumptions of FSAR accident analysis. Therefore, a reactor trip initiated as a result of the loss of offsite power does not increase the probability of occurrence or the consequences or an accident or malfunction of equipment important to safety previously evaluated in the safety analysis report.

2) Does the subject of this evaluation create the possibility for an accident or malfunction of a different type than any evaluated l

previously in the safety analysis report?

I FSAR Section 15.2.0 accident analysis assumes the reactor trip occurs as a result of loss of offsite power. Therefore, the change to this procedure does not create the possibility for an accident or malfunction of a different type than any evaluated previously in the j safety analysis report.

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Ilouston I_ighting & Power Company ST-HL-AE-2692 File No. G20.01 Li- 10CFR50.59 JUnreviewed Safety-Question Evaluation #88-085 (cont'd)

3) Does the subject of this evaluation re' uce d the margin.of ~ safety as defined in the basis for any technical specification?

This change results in a test procedure that is within the bounds'-of FSAR. Chapter 15 accident analysis. There is no impact on the Technical Specifications. Therefore, the margin of safety as defined in the basis for any technical specification is not reduced.~

Based on the above, there is no unreviewed safety question.

Approved: 5/24/88 t

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NL.88.160.02