ML20091D656

Revised Application for Amend to License NPF-87 Re Boron Dilution Mitigation Sys.Util Proposes That TS Rev Have Six Month Validity After Criticality Following Second Outage to Research Issues & Resolution & Propose Solution

ML20091D656
Person / Time
Site:	Comanche Peak
Issue date:	04/06/1992
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20091D659	List: ML20091D656 ML20091D666
References
TXX-92169, NUDOCS 9204100333
Download: ML20091D656 (3)

Text

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",",,,,J" ",",,",,;lll Log # TXX-92169 lll"lllll" *:ll':lll Fi1e # 916 (3/4,3)

Ref. # 10CFR50,92 +

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7UELECTR/C April 6, 1992  !

Williari j, Cabill, Jr.

Umq Deriresiden U. S. Nuclear Regulatory Commission Attn: Document Control Oest Washington DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET N05. 50-445 AND 50-446 BORON DILUTION MITIGATION SYSTEH ADDITIONAL INFORMA110N RELATED TO LAR 92-001 REF: TV Electric letter from William J. Cahill, Jr.

to the NRC dated February 28, 1992 Gentlemen:

j, The_ referenced letter requested an amendment to the CPSES Unit 1 Operating l License (NPF-87) to revise the Technical Specifications as they relate to l

the Boron Dilution Hitigation System. On March 23, 1992, a meetina was held in Rockville, Maryland, to discuss this proposed amendment. The meeting was

( attended by representatives from the NRC Staff TU Electric and the l2 Westinghouse . El ect ri c Corpora t ion.

l As a result of that meeting, TV Electric was requested to provide additional information. The NRC did not feel that it was appropriate to approve this amendment as a permanent change due to the potential generic imnlication to certain other Westirghouse units; however, the NRC did recognize that temporary relief was necessary for CPSES until the issue could be researched l further and an acceptable long-term solution could be identified.

'Therefore, TU Electric was requested to provide a letter which proposed a time limitation for the revised Technical Specification (including proposed mark-up of the current Technical Specification (NUREG-1399) pages) and a discussion of the_ compensatory actions that TV Electric would take during this time period. This letter hereby provides the requested information.

TV Electric proposes th'at the Technical Specification revision proposed by the referenced letter remain in effect for Unit I until six months after criticality folloving the second refueling outage and for Unit 2 until six months following ititial criticality. These durations are expected to allow sufficient _ time _to-research the issues involved, verify the conclusion during testino f silowing core ( relicad, prcpose a permanent re*,olution and for the NRC to review and approve the permanent resolution. A modification to the-Technical 5pr iffrations (NUREG-13991 mark-up submitted in the reference letter is included in Attachment 2 'to address these time limits, I

i i-9204100333 920406 1 PDR ADOCK 05000445 L. p. ppg 400 N. Obve Stnet LB. 81 Dallas,Tenas 75201 Od3

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TXX-92169 Page 2 of 3 This mark-up splits the applicable action statement to address the Source Range and the Boron Dilution Flux Doubling se;>arately and a footnote is used to denote the effective date for the Boron Dilution Flus Doubling requirement.

The following compensatnry action is proposed for the duration of this temporary revision of t rie Technical Speci f ic at ion:

1) Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of entry into MODES 3, 4. or 5 from MODES 1, 2. or 6, (and once per every 14 days thereafter while in MODES 3, 4, or 5).

TV Electric will verify (unless startup is in progress) that either valve CS 845; or valves CS-8560, FCV-IllB, CS-8439, CS-8441, and _

CS-8453 are closed and secured in position; or

2) Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of entering MODE 5, 1U Electric will ensure that only one Reactor Makeup Water Pump (dilution source) is aligned to the supply header. Following entry into MODES 3 4, or 5 from MODES 1, 2 or 6, each crew of the Control Room Staff will receive a briefing to discuss the type of reactivity changes that could occur during a dilution event ;

the indications of a dilution e ent; and the actions required to stop a dilution, commence immediate boration and establish tra required shutdown margin, For extended shutdowns, this briefing will be repeated for e6th crew prior to resumption of control room duties following an off duty period which exceeds 7 days. During time periods when this option is used, the source range will be monitored for indication of unexplained increasing counts and inadvertent buron dilution every Ji f teen (15) minutes.

Since this letter merely limits the duration of the Technical Specifications proposed in the referenced letter, the safety assessment and no significant hazard determination provided in the referenced letter remain valid. .

If there are any questions on this letter, please contact Jimmy Seawright at (214) 812-4375.

Sincerely,

,/ ~

William J, Cahill, Jr.

DRW/grp

Attachment:

Marted up Technical Specification Pages tHUPEk 13f~)

c - Mr. R. D. Ma rt in , Peoion IV Resident I n s p, tore , CMER (21 Mr. T. A Bernmen, NPR l

-TXX 92169 Page 3 of UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Hatter of )

)

Texas Utilities Electric Company ) Docket Hos. 50-445

) and 50 446 (Comanche Peak Steam Electric )

Station, Unit 1 & 2) ) __

AfflDAVIT William J, Cahill, Jr. being d .y sworn, hereby deposes and says that he is Group Vice President, Nuclea of TV Electric, the lead Applicant herein:

that he is duiy authorized ',o sign and file with the Nuclear Regulatory

. Commission this response t > the Boron Dilution Mitigation System Additional Information Reluted to License Amendment Request 92-001 for the captioned facility: that he is famil.ar with the content thereof; and that the matters set forth.therein-are true and correct to the best of his knowledg*

information and belief.

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f. .g ; l

_ l'am'J.Jr.Cahi[t W lli Group Vice Pres

/'

, Nuclfar ent _

STATE OF TEXAS )

)

COUNTY OF $

Subscribed and sworn to before me, on this 6th day of

, d Anril , 1992. ,

I -

' Notary [P ablic V

_ _ . . .