ML20062B365

Application for Amends to Licenses NPF-76 & NPF-80,changing Tech Spec 3.3.3.6 Re Steamline Pressure post-accident Monitoring Channels Becoming Inoperable

ML20062B365
Person / Time
Site:	South Texas
Issue date:	08/22/1990
From:	Kinsey W HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20062B366	List: ML20062B365 ST-HL-AE-3543, Proposed Tech Specs 3.3.3.6 Re Action Taken in Event of Steamline Pressure post-accident Monitoring Channels Becoming Inoperable
References
ST-HL-AE-3543, NUDOCS 9010240292
Download: ML20062B365 (8)

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August 22h1990 l

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File No.: G9.06, G20.01 1

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' 10C71t50. 90 4

1 E) h 10CFR50.92-

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.U. S. NuclearLRegulatory Commission E!

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Attentioni: : Document Control-Desk '

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. South Texas Project Ele'ctric Generatirig Station Units 1 andJ2'

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Docket Nos. STN $0 498,1STN 50 499 i

0 Proposed Amendment to the Unit 1"and Unit 2 Technical Sneeification'3.3.3~.6 for-Steamline-Pressure InstrumentarionL j

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l; Pursuant!to 10CFR50.90, Houston Lighting & Power Company (H14P)1hereby j

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< amendment vould change Technical Specification (TS)L3.3.3.6 regarding the d

proposes to-amend 11ts Operating / Licenses.NPF-76 and NPF 80.

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The proposed

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ty action ~co:.be taken in<the event of one of the'four steamline pressure post-M (r_.y accident monitoring channels ber.oming inoperable. The-change would eliminate-l J

the requirement to shutdown the plant if one'of<the four channels is di u

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inoperable. The shutdown reqvirements would be retained for,the condition-of'i fewofinoperable channels.

The proposed change will maintain a conservative' 1

design.and reduce the potential for unnecessary unplanned' shutdowns, thereby~

y increasing plant' safety 1and reliability. This proposed change is to the

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Technical: Specifications fo: the South Texas-Project Electric Generating Station (STPEGS) Units 1 and 2.

A similar Technicalv$pecification change vas-n approved and incorporated i;ito Table: 3.10~ 1 of Technical Specification'3.3.3.6.'

o in Amendment Nos 14 and14 to Facility, Operating License-Nos NPF 76 and NPF-80.

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_HIAP has. reviewed the-attached proposed amendmenk pursuant to 10CTR50.92 and. determined that it does,not involve a significant: hazards consideration.

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L The basis =for this' determination;is provided'in the1 attachments.

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-based on'the information contained in this submittal and.in the NRC Final 1l Environmental Statement related;to the operation-of STPEGS' Units l'and 2,1 HIAPE

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M has concluded-that, pursuant.to 10CFR31, there are no significant radiological

.or non radiological. impacts; associated with the proposed action and the b

proposed license. amendment will'not have a significant effect on the quality of the environment.-

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A Subsidiary of Houston Industries incorporated

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9010240292 900822 PDR ADOCK 05000498 PDC 4}3; _

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- HoustIn Lighting & Power Company L South Texas rroject Electric Generating Station.

ST HL AE-3543'

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' File, No. :.- C9.06,, C20.01 Page 2

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.The STPEGS Nuclear' Safety' Review Board h'as reviewed and approved the.'

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proposed changes.

- In accordance with.10CFR50.91(b),. H1AP is. providing the State of Texas-

. ith a' copy of this proposed amendment.

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If you should have any questions concerning this~ matter, please' contact 1 j

Mr. A. W. Harrison at (512)'972 7298 or myself at (512) 972-7921.

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- W. H.-Kinsay_

L Vice Preside Nuclear Generation

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SDP/ amp 1

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,f Attachments:

1..Significant Hazards Evaluation for

-l Eliminating.from' Technical Specification

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3.3.3.6 the Shutdown Requirement for. Loss

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of One of Four-Channels of'Steamline Pressure Instrumentation i

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2. Proposed Technical Specification Change j

'3.3.3.6, Table 3.3 10-

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. Houstra Lighting & Piwer Company--

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Sodth Tesas Project Electric Generating Station p.g, 3

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CC' Regional = Administrator, Region IV Rufus-S. Scott i

Nuclear Regulatory Commission Associate General Counsel-611 Ryan" Plaza: Drive, Suite 1000 Houston Lighting & Power Company Arlington,- TX 76011 P. O. Box 61867 or

. Houston, TX 77208

George Dick,' Project Manager U.S. Nuclear Regulatory Commission INPO Vashington, DC 20555 Records Center

1100 circle 75 Parkway J. I. Tapia Atlanta, GA.30339 3064-Senior Resident Inspector c/o U. S. Nuclear Regulatory _

Dr. Joseph.M. Hendrie Commission-50 Be11 port 14nei P. O. Box 910 Be11 port.. NY _ 11713 Bay City TX 77414-D. K Lacker J. R. Newman, Esquire Lureau of' Radiation Cor. trol-Newman & Holtzinger, P.C.

Texas Department of Health-

~1615-L Street, N.W.

1100 West 49th Street Washington, DC 20036 Austin, TX 7870'4 D.'

E.- Ward /R. P. Verret Central Power 6. Light Company P. O. Box 2121' Corpus Christi, TX 78403 J. C. Lanier Director of Generation City of Austin Electric _ Utility 2721 Barton: Springs Road' Austin,.TX 78704' R.1J. Costello/M. T. Hardt City Public Service Board P. O. Box 1771

-San Antonio, TX 78296 Revised 12/15/89 LA/NRC/

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NUCLEAR RECUIATORY COMMISSION '

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LIn the Matter'

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Houston Lighting & Power

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Docket Nos. 50-4981 Company, et al.,

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South Texas; Project

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.a AFFIDAVIT i

W. H.-Kinsey being duly sworn, hereby deposes and says:that he is'Vice President, _ Nucle,ar Generation.. of Houston Lighting & Power Company; that. he.is' duly authorized to sign and file ^vith the Nuclear Regulatory Commission the e

attached proposed! change'.to the South Texas Project Electric Generating._

Station Technical Specification 3.3.3.6; is-familiar with the'_ content thereof;=

'and that the matters' set forth therein are true1and correct to the best of his:

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-knowledge and. belief.

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W.>H; Kinsey Vice - President.-

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-Nuclear Generation Subscribe'd and sworn to before me..a Notary Public in-.and.for.The

. State of Texas. this.A2dday of-mt, 1990.

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~ SHARON DONAHY-p sm1,me l-mu or:ms Notary Pud 11c in and for ther -

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g State of Texas My Comm. Esc. Act. 6.1991 o

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JtE ATTACHMENT 1 SIGNIFICANT HAZARDS EVALUATION FOR ELIMINATING FRlH THE TECHNICAL SPECIFICATION 3.3.3.6 THE SHUTDOWN REQUIRLtENT FOR LOSS'0F ONE 0F FOUR CHANNELS OF STEAMLINE' PRESSURE INSTRUMENTATION' s

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SIGNIFICANT HAZARDS EVALUATION FOR ELIMINATING FROM THE

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TECHNICAL SPECIFICATION 3.3.3.6 THE SHUTDOWN REQUIREMENT FOR r

1 DSS OF ONE OF FOUR CHANNELS OF STEAMLINE PRESSURE INSTRUMENTATION.

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Background

The Post Accident Monitoring (PAMS) instrumentation involved in the proposed change is steamline pressure. These are Regulatory Cuide 1.97 Rev. 2 category 1 instruments, as shown_in STPECS UFSAR Table 7.5 1.

For this function there are four safety'grado channels that input into the Qualified i

Display Processing System (QDPS). The QDPS post accident monitoring function.

for the subject parameter will remain operabic as long as there is at-least one validiinput._'This provides STPEGS a degree of redundancy _and conservatism when compared to'the requirements of Westinghouse Standard Technical--

Specifications'. Requiring plant shutdown in the ACTION statement with the loss of only_one_ channel-is overly restrictive to plant operation and unnecessarily creates the potential for unplanned plant shutdowns.. HIAP.

believes that eliminating this requirement will result in more reliable and

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Erocosed CHAD &A

.H14P proposes to revise Table 3.3 10 of Technical: Specification q

l 3.3.3.6 to. eliminate the shutdown requirement of ACTION 38 for loss of one of four channels of steamline pressure instrumentation. A similar Technical

' Specification change was approved in Amendment Nos 14 and 4 to Facility Operating License Nos NPF-76 and NPF 80.

A new action statement (ACTION 43).

which considers the additional redundancy existing at STPEGS Units 1 and 2 to measure pressurizer level, was incorporated into Table 3.3-10 of Technical Specification 3.3;3.6.

' Safety Evaluation j

The STPEGS Technical Specifications presently require that the plant be shutdown-if one' channel is inoperable.and cannot be restored in 90 days.

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HL&P believes that imposing a plant shutdown because of.the unavailability of one;of.four channels of post accident monitoring instrumentation is-unjustified in view of the degree of redundancy and the undesirability of j

performing.an unplanned shutdown with its attendant cycles on plant equipment.

j The' Standard Technical Specifications for Westinghouse Pressurized' Water Reac' tors,' NUREG-0452, Revision 5 ~ require a total of two channels for the Steam Line Pressure PAMS. The minimum channels operable requirement is one and with--

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4 one channel. operable the allowed outage time (A0T) is 7 days. With both 4

channels. inoperable, the A0T is 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.

The proposed Technical Specification change provides a 31 day A0T with only two channels operable which is conservative.when compared to the f

Standard Technical Specifications and reflects the design of STPEGS.

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' Attachment 1 4

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y-Safety Evaluation. Cont'd.

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.The proposed 7 day ACT for only oneichannel'. operable and 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> forL

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-no channels operable follows the Standard Technical-specifications. Note that r

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there are no changes to the existing STPEGS ACTIONS for more,than one channel' L

' inoperable. Additionally, the proposed change will'not-require a plant

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shutdown with one channel inoperable-which will have's positive effect on y

- plant reliability. and reduces potential challenges: to safety systems.

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The' proposed change, to use existing action statement (ACTION 43),

j A"r involves no physical changes to the station.. The plant design and l

instrumentation configuration and quality classification are unchanged. The l

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. Proposed change does not in any way affect the requirements of Technical Specifications 3.3.2 governing the ESFAS function associated with this 4

instrumentation.

. Based on the evaluation above, H14P concludes that the change in no l:

way degrades the reliability or design of the post-accident monitoring l:l l instrumentation and further reduces tho' potential for unplanned plant

4 shutdowns and-is consequently an overall improvement in station safety.and reliability.

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yo-Determination of Sirnificar.t Hazards 13 s3'~

Pursuant to 10CTR50.91, this analysis-provides a determination that the proposed change to the-Technical Specifications does not involve any significant hazards consideration as defined.in 10CTR50.92.

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1.. The proposed change does not involve a significant increase in the j

probability or consequences of an ' accident previously evaluated.

1 Eliminating the. shutdown requirement in the ACTION statement for

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loss of one of four channels of post accident monitoring instrumentation does not effect.the probability'of an accident'

. because-monitoring instrumentation 'does not contribute to. accident

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probability. The accident mitigation functio.n of the subject f

instrumentation is_ addressed by other Technical Specifications, q

which.are unaffected by this proposed change. ' Additionally, thrse i

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channels. of Steam 1.ine' Pressure Instrumentation can monitor the.

Steam Generator pressure in a post-accident mode and provides one L

more channel than the redundancy specified in Regulatory Guide 1.97, E

The consequences of an accident are not affected by the proposed a

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The proposed change does not create the possibility of a new or different kind of accident from that previously. evaluated. The proposed change involves no changes to the station or its design bases nor does it impose any new accident scenarios.

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Page 3 Determination of'Sirnificant Marards. Cont'd.

3. cThe proposed change does not involve a significant reduction in a margin of safety. There is no change to the margin of safety since there is no change'to the station or,its: design bases'.

Conclusion Based on the above,-Hi&P concludes that the proposed change. satisfies the significant hazards. considerations standards of 10CFR50.92(c) and a no significant hazards consideration finding is justified.-

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