ML20211L987

Forwards Rev 31 to Technical Requirements Manual. All Changes Applicable to Plants Have Been Reviewed Under Util 10CFR50.59 Process & Found Not to Include Any USQs

ML20211L987
Person / Time
Site:	Comanche Peak
Issue date:	09/03/1999
From:	Terry C TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20211L991	List: ML20211L987 ML20211M004
References
TXX-99210, NUDOCS 9909090022
Download: ML20211L987 (5)

Text

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Comenche Peak Senior Vice President & Principal Nuclear Officer 1 Steem Electric Station P.O. Box 1002 -

Glen Rose,TX 76043 --

' Tel:254 897 8920 - .

Fax:254 897 6652 :

Ittrryl@txu.com -

' Log'# LTXX-99210 ,

File # 10010 916 (TRM)1

- Ref. # : 10CFR50.36 September 3,1999 t

U. S. Nuclear Regulatory Commission

'Atta: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 TRANSMITTAL OF TECHNICAL REQUIREMENTS MANUAL (TRM) REVISION 31 Gentlemen:"

TXU Electric herewith submits Revision 31 (enclosed) of the CPSES Technical

- Requirements Manual (TRM). Enclosed is the following document:

Technical Requirements Manual I signed original Revision 31 and 10 copies

,. The Attachment contains a description of the changes for Revision 31. All changes

-applicable to CPSES Units 1 and 2 have been reviewed under the TXU Electric 10CFR50.59 process and found not to include any "unreviewed safety questions."

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TXX-99210 Page 2 of 2

- TRM Revision 31, dated August 5,1999, became effective at 12:01 AM CST on August 5,1999.

This communication contains no new licensing basis commitments regarding CPSES 1 Units 1 and 2. If you have any questions, please contact Carl Corbin at (254) 897-0121.

Sincerely, C. L. Terry By:

D. R. Woodlan Docket Licensing Manager CBC/cbc Attachment Enclosure c- E. W. Merschoff, Region IV J. I. Tapia, Region IV D. H. Jaffe, NRR Resident Inspectors, CPSES

, . Attachment to TXX-99210 CPSES - TECHNICAL REQUIREMENTS MANUAL REVISION - 31 DETAILED DESCRIPTION Prefix Page Page 1 (as amended) Group Description 13.3- 24 2 This request proposes to revise the surveillance requirements TRS 13.3.33 entitled " Turbine Overspeed Protection" in the Comanche Peak Steam Electric Station Unit I and Unit 2. TRS 13.3.33.2 is revised to require cycling of each high and low pressure turbine stop and control valve once every 12 wecks (currently 6 weeks) using the manual test or the automatic turbine tester. Also, Surveillance TRS 13.3.33.3 is revised to require direct observation of the movement of the above turbine valves through one complete cycle once every 12 weeks (currently 6 weeks).

Revision The surveillano requirement TRS 13.3.33.2 currently requires cycling each high and low pressure stop ar.d control valve once per 6 weeks using the manual test or the Automatic Turbine Tester. TRS 13.3.33.3 currently requires the direct observation of the movement of the above turbine valves through one complete cycle once per 6 weeks. The surveillance testing requires moving each turbine valve through one complete cycle and is typically performed by a control room operator with an observer at the valve.

The test verifies freedom of movement of the valve components and is beneficial in detecting problems with valve operation and identification of gross outward appearance of valve condition. .he surveillance requirement ensures that all turbine steam inlet valves are capable of closing to protect the turbine from excessive over speed which could generate potentially damaging missiles. To minimize the effects while assuring proper protection against overspeed, TU Electric has received from Siemens a recommendation to decrease the valve testing frequency to 12 weeks. This decrease in testing frequency contains provisions for additional monitoring of the stop valves and that no degradation is observed. This recommendation was based on a quantitative evaluation performed by Seimens on the probability of failure of the overspeed trip and protection system as a function of the turbine stop and control valve test interval. CPSES will install the additional monitoring sensors before each test.

Based upon the ACPSI Report ER-504, and the updated stop and control valve failure probability, it is concluded that the implementation of this TRM surveillance revision will not increase the probability or consequences of an accident previously analyzed. The revision of the se:veillance results in a net improvement in plant safety by reducing the likelihood of plant trips and stress and wear on plant components.

Change Request Number TR 1 . 1 Related SER SSER -

SEIUSSER 1mpact N 1

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m Enclosure to TXX-99210 l

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COMANCHE PEAK STEAM ELECTRIC STATION UNITS 1 & 2 TECHNICAL REQUIREMENTS MANUAL (TRM) INFORMATION ONLY INSTRUCTION SHEET (Page 1 of 1)

The following instructional information and checklist is being furnished to help insert Revision 31 TRM pages into the Comanche Peak Steam Electric Station TRM.

Insert Remove Section 13.3 13.3 24 13.3 24 List of Effective Paaes EPL-1 through EPL 7 EPL 1 through EPL 7 l

Note: Please complete the entry for insertion of Revision 31 on the " Record of Changes" form located at the beginning of the TRM.

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