ML17347A143

Advises That Util Will Equip Temporary Filtration Sys W/ Electric Heater for Purpose of Humidity Control to Provide Addl Assurance That Sys Will Perform at Required Levels of Efficiency,Per NUREG-0737,Item III.D.3.4

ML17347A143
Person / Time
Site:	Turkey Point
Issue date:	11/14/1986
From:	Woody C FLORIDA POWER & LIGHT CO.
To:	Mcdonald D Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-3.D.3.4, TASK-TM L-86-464, NUDOCS 8611180215
Download: ML17347A143 (8)

Text

REQULAT INFORMATION DISTRIBUTION YSTEM <RIDB)

ACCESSION NBR 8611180215 DOC. DATE: 86/ii/14 NOTARIZED: NO DOCKET 0 FAC IL: 50-250 Turkey Point Plant> Unit 3I Florida Powev and Light C 05000250 5O-251 Tuv keg Point Planti Unit 4i Flov ida Powev'nd Light C 05000251 AUTH. NAME AUTHOR AFF ILXATION WOODY~ C. O. Flov ide Power Zc Light Co.

REC IP. NAME REC I P X ENT AFFILIATION MCDONALD D. Q PNR Pv object Div ectorate 2

SUBJECT:

Advises that util will equip temporary Filtv ation sos w/

electv ic heater Fov puv pose oF humiditg control to pv ovide addi assuv'ance that sos wi I I pev'Fov'm at v equiv'ed levels oF eFFiciencg> per NUREQ-0737. Item III. D. 3. 4.

DISTRIBUTION CODE: *003D COPIES RECEIVED: LTR Q ENCL J SIZE: cR Ltr 82-33)

TITLE: OR/Licensing Submit ta1: Sup p1 1 to NUREQ-0737(Qeneri c NOTES:

REC IP XENT COPIES RECIPIENT COPIES ID CODE/NAl'IE LTTR ENCL ID CODE/NAI'lE LTTR ENCL Pl>JR-A ADTS 1 PNR-A EB PNR-A EICSB 2 2 PNR-A FOB 1 1 PNR-A PD2 LA 1 1 PNR-A PD2 PD 7 7 McDONALD> D 1 PNR-A PSB 1 1 PNR-A RBB 1 INTERNAL: ADM/LFMB 0 IE/DEPER/EPB 3 3 NRR BNR ADTB 1 NRR PAULSON,.N: 1 1 NRR PIJR-B ADTB 1 NRR/DBRO EMRIT NRR/ IB 1 NRR/DSRO/RBXB 1 1 I E 1 1 RQN2 EXTERNAL: LPDR 1 1 NRC PDR 1 1 NBIC 1 TOTAL NUMBER OF COP IEB REQUIRED: LTTR 31 ENCL 30

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. O. Box 14000, JUNO BEACH, F L 33408 FLORIDA POWER & LIGHT COMPANY NOVEMBER 14 1986 L-86-464 Office of Nuclear Reactor Regulation Attention: Mr. D. G. McDonald, Project, Manager PWR Project Directorate N2 Division of PWR Licensing - A U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Mr. McDonald:

Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-25 I Proposed License Amendment Control Room Ventilation By letter dated August 25, 1986 (L-86-332) Florida Power 8 Light Company (FPL) requested a one-time Technical Specification change to support implementation of modifications required to resolve NUREG-0737, Item ill.D.3.4 "Control Room Habitability." Justification for the Technical Specification change was supported by a No Significant Hazards Evaluation (NSHE) which took credit, in part, for the installation and use of a temporary filtration system to service the control room during the modification period.

Because of questions raised during an engineering review of vendor information regarding capability of the temporary filtration sytem to remove iodine above 70% humidity, FPL intends to equip the system with an electric heater for the purpose of humidity control to provide additional assurance that the temporary filtration system as discussed in the NSHE will perform at the required levels of efficiency under Turkey Point site environmental conditions. The electric heater, which will be installed at the fresh air intake to the temporary filter unit (See the attached figure), will ensure that the iodine removal efficiency of the downstream charcoal adsorber will be maintained at acceptable levels during periods of high humidity. The electric heater will be designed for automatic operation with a relative humidity sensing device and control circuit set to energize the heater when the air relative humidity exceeds 70 percent.

Under normal conditions, power to the electric heater will be supplied from an existing non-vital plant bus. However, to ensure operability of the heater under loss of offsite power conditions, a dedicated, non-safety grade portable diesel generator will be available to serve as a backup source of power which will start automatically on low voltage to the bus feeding the heater. This backup diesel generator will be capable of continuous operation for up to 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> without refueling. Under accident conditions, operation of the backup diesel generator and the temporary system heater for 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> is sufficient to ensure acceptable performance of the charcoal adsorber to maintain the control room operators exposure dose to within GDC-I9.limits.

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Mr. D. G. McDonald, Project Manager L-86-464 Page two The addition of this electric heater and its associated diesel generator power supply will enhance the performance of the charcoal adsorber during periods of high humidity. Operability of these components and their associated actuation and control circuitry will be demonstrated by appropriate functional testing prior to use. Therefore, this design enhancement will not alter the conclusions of the NSHE provided in our August 25, I 986 submittal.

If you have any questions, please call us.

Very truly yours,

. O. Woody roup Vice President Nuclear Energy COW/TCG/gp Attachment cc: Dr. J. Nelson Grace, Regional Administrator, Region II Mr. Alan Schubert, Manager Office of Radiation Control Department of Health Bc Rehabilitative Services I 3 I 7 Winewood Blvd.

Tallahassee, FL 3230 I Harold F. Reis, Esquire, Newman and Holtzinger TCG6/005/2

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TEMPORARY FILTER NIT S"o HT P FLEXIBLE DUCT I I O.A. I I I I- - 4 NOTE L- 6 NOTE 2 BACKlP FILTER UNIT HTR P C LEGEND NOTES MOV -MOTOR OPERATED VALVE L NON- VITAL POWER FEED BACKED-UP O.A. -OUTSIDE AIR SY POR TABlE DIESEL GENERATOR.

P -PRE-f ILTER H -HEPA FILTER 2. VI TAL POWER FEED.

C -CHARCOAL ADSORBER H TR -ELEC TRI C HEATER