ML20211Q931

Reviews Tech Spec Change Request 125 Re Surveillance Requirement on DHR Loop Flow Rate During Mode 6.Request Unacceptable.Lower Flow Rate to Replace Value of 2,700 Gpm or Withdrawal of Request Suggested

ML20211Q931
Person / Time
Site:	Crystal River
Issue date:	12/10/1986
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Wilgus W FLORIDA POWER CORP.
References
NUDOCS 8612220196
Download: ML20211Q931 (3)

Text

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i December 10, 1986

Docket No. 50-302 Mr. Walter S. Wilgus

- Vice President, Nuclear Operations Florida Power Corporation ATTN: Manager, Nuclear Licensing and Fuel Management P.O. Box 14042, M.A.C. H-2 St. Petersburg, FL 33733 r l

Dear Mr. Wilgus:

We have completed the review of your Technical Specification Change Request (TSCR) number 125datedNovember9,1984. The request proposed a change to the technical specification (TS) regarding the surveillance requirement on decay heat removal (OHR) loop flow rate during Mode 6. The current TS 4.9.8.1 states that a decay heat removal loop shall be determined to be operating and circulating reactor coolant at a minimum flow rate of 2700 gpm at least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. You stated in your letter that at certain times during Mode 6, the reactor coolant system water level may be lowered below the vessel flange resulting in insufficient net positive suction head to allow the DHR pump to operate at 2700 gpm. Under these conditions, the flow is throttled to approximately 1500 gpm. Therefore, the required DHR loop must be considered not in operation at the reduced flow rate and containment penetrations providing direct access from the containment atmosphere to the outside atmosphere must be closed. This containment penetration isolation could delay required activities within the containment during a refueling. You proposed that TS 4.9.8.1 be modified without specifying a minimum DHR flow rate.

During the staff review of the proposed TS change, several conference calls were held between our staffs. The NRC staff indicated that it is not acceptable to eliminate a minimum required DHR flow rate in the surveillance requirement of TS 4.9.8.1. However, a lower flow rate could be proposed to replace the value of 2700 gpm with supporting analysis which would demonstrate the following:

1) The proposed minimum DHR flow rate will provide sufficient cooling capacity to maintain the reactor coolant system temperature below 140*F; and

2) The proposed minimum DHR flow rate will provide sufficient reactor coolant circulation to minimize a baron dilution incident and to prevent boron stratification.

Your staff has indicated that they do not plan to provide this information.

8612220196 861210 PDR ADOCK 05000302 P PDR

Therefore, we conclude the proposed TS change regarding the surveillance reauirement on DHR loop flow rate during Mode 6 is not acceptable in its present form. We request that you either supply a lower flow rate, with justification, or withdraw the TSCR. If you do not respond within 30 days, we will consider the issue closed and will not consider the request further.

Sincerely,

/S/

John F. Stolz, Director PWR Project Directorate #6 Division of PWR Licensing-R cc: See next page Distribution:

Docket File NRC 1. LPDRs Branch Files Ringram BMozafari HSilver RWeller FMiraglia GFdison ACRS OGC-Bethesda FJordan JPartlow BGrimes

                  . . YA gew             }{ W         h PWR#6         PWR[6      PWR#6          PWPA6     PWR#6 RForafari;eh  HSilver    PWeller        GFdison   JStol7 jg /g/86        13,/ 7 /86 /2//0/86       gv/p/P6  a / c/86 f

I Mr. W. S. Wilgus Crystal River Unit No. 3 Nuclear Florida Power Corporation Generating Plant cc: Mr. R. W. Neiser State Planning and Development Senior Vice President Clearinahouse and General Counsel Office of Planning and Budget Florida Power Corporation Executive Office of the Governor P. O. Box 14042 The Capitol Building St. Petersburg, Florida 33733 Tallahassee, Florida 32301 Mr. P. McKee Mr. F. Alex Griffin, Chairman Nuclear Plant Manager Poard of County Commissioners Florida Power Corporation Citrus County P. O. Box 219 110 North Apopka Avenue Crystal River, Florida 32629 Inverness, Florida 36250 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident inspector I!.S. Nuclear Regulatory Commission 15760 Vest Powerline Street Crystal Piver, Florida 32629 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. Allan Schubert, Manager - Public Health Physicist Department of Health and . Rehabilitative Services 1323 Winewood Blvd. Tallahassee, Florida 32301 Administrator Department of Environmental Regulation Power Plant Siting Section State of Florida 2600 Blair Stone Road Tallahassee, Florida 32301 Attorney Gereral Osrartment of Legal Afft. irs The topitol Tallahassee, Florida 32304}}