ML18139B365
| ML18139B365 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 05/29/1981 |
| From: | Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 300, NUDOCS 8106030375 | |
| Download: ML18139B365 (21) | |
Text
- ,
f' VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND,VIRGJ:NIA 23261 May 29, 1981 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Gentlemen:
Serial No. 300 NO/RCC:ms Docket Nos. 50-280 50-281 License Nos. DPR-32 DPR-37 AUXILIARY VENTILATION SYSTEM MODIFICATION SURRY POWER STATION - UNITS 1 AND 2 As indicated in our letter Serial No. 045A/020177 of June 6, 1978 this letter is to inform you that our latest construction schedule indicates that Surry Unit 1, which is presently in a steam generator outage, is due to be loaded with fuel on or about June 1, 1981 and made critical by July 1, 1981.
Over 85 percent of the modification work required for upgrading the auxiliary venti-lation system to its final design would be completed by the Unit 1 start-up date.
To complete the modification and upgrading, approximately two addition-al months of work is required with both units at power.
Included is work necessitated by the requirements of Increased Range of Radiation Monitoring (NUREG-0578 and 0737).
Final testing and balancing, tentatively scheduled during the Unit 2 refueling outage in the Fall of 1981, will have to be completed to permit the implementation of the new technical specifications which were transmitted to you in October 1980 (letter Serial No. 862).
The scope of work and the estimated extent of its completion by the Unit 1 start-up date is shown on Attachment I to this letter.
The item descrip-tions of work have been grouped into eight broad categories which constitute the eight objectives of the auxiliary ventilation system modification.
The "Remarks" column highlights the safety aspects of, and manual actions required for, the incomplete items of work.
It must be pointed out that the entire modification is being performed under conditions equal to or more stringent than the original station design conditions.
Also, all major equip-ment necessary for the upgrading of the system (i.e., new fans, new filter train-and dampers) have been installed.
Control and instrumentation equipment for the automatic initiation of the system will not be totally functional and will require some operator manual actions.
In addition, instrumentation to verify the performance of the filter trains is installed and operable.
For each item or group of items of work, the ventilation system is aligned in a manner compatible with station operating conditions.
Each ventilation system
~
alignment is illustrated diagrammatically and. displayed in the control room, f\\d>:~*O showing the mode of ventilation system operation and the work being performed Y'~ '1C" during that particular alignment (See Attachment II).
8106 08 (J 375
VIRGINIA ELECTRIC AND POWER COMPANY TO Testing and balancing are the final steps of the auxiliary ventilation system modification.
It is a design feature of the system that final balancing has to start with the purge system operational; therefore, either Unit 1 or 2 must be in a shutdown mode.
This postpones the completion of the balancing and testing and, therefore, of the implementation of the Technical Specifications until after the refueling outage 'of Unit 2 presently scheduled for the fall of 1981.
To improve this schedule, we are presently investigating the feasi-bility of performing balancing in two phases; the first phase to coincide with the present outage of Unit 1 and the second phase to start immediately after completion of the modification work.
If you have any questions or require additional information please contact us.
cc:
Mr. James P. O'Reilly, Director Office of Inspection and Enforcement Region II Very truly yours,
- zJ /1 l1L4
- _jJ.
~ B. R. Sylvia
} Manager - Nuclear Operations and Maintenance 2
ATTACHMENT I Auxiliary Ventilation System Objectives System Diagram
-,~
A.
ATTACHMENT I Filtering ECCS Leakage Following a LOCA Without Exceeding Filter Capacity (1) Install a two-position damper in the exhaust duct of each charging pump cubicle to automatically open and exhaust air when the pump operates and close when pump stops.
(2) Disconnect the exhaust ducts of nonsafety-related equipment cubicles from the charging pump exhaust system and connect them to the Auxiliary Building general area exhaust system.
The above two changes will reduce the flow rate of the ECCS equipment area exhaust air to the capacity of one filter train (36,000 cfm).
(3) Install perforated plste air distribution and straightening subplenums in the inlet and outlet plenums.of the two safety-related filter housings to provide uniform air flow through the filter elements, (4) Seismically support the safeguards and charging pump exhaust ducts to qualify the entire ECCS leakage collection and filtration system as a safety-grade system.
(5) Adjust the supply air rate to the Auxiliary Building to match the exhaust rate reduced in item (1), above, B,
Limiting ECCS Equipment Area Temperature Following a LOCA Install the two safety-related, high-head fans (l-VS-F-58A and B), sized to draw 36,000 cfm from~CCS equipment areas through the safety-related filters following a LOCA, C,
Design Features for Periodic Verification of Filter Performance For each one of the two safety-related filter trains, install 18 charcoal canisters in parallel with the main adsorber tray banks.
The canisters will be filled with the same adsorbent as the main adsorber trays and will be removable from the outlet plenum for laboratory analysis, Proposed Status as of Unit 1 Start-up 30% installed Complete Complete 30% installed on Safeguards Exhaust 30% installed on Charging Pump Exhaust Not started Complete Complete At LacllWta!llL.I.
Page! of _i Remarks balancing dampers are opened and closed in where motor operated Existing manually cubicles dampers have not been installed.
None Air distribution to be calibrated and fine tuned during final testing and balancing, None Adjustment to be performed during final testing and balancing.
None Residence time through canisters to be REDUCED to match adsorber bed residence time during final testing and balancing.
D, E,
Controlling the Release of Filtered ECCS Leakage in Wake of Unit 2 Containment (1) Install a new stack on the roof of the personnel hatch of Unit 2 containment and divert the discharges of the exhaust fans from the old stack to the new
- stack, (2) Install a new sampling point and flow element for continuous radiation and flow rate monitoring of releases through the new stack, (3)
Provide automatic power interruption to nonsafety-related exhaust fans which potentially bypass the safety-related filters (4)
Provide automatic power interruption to nonsafety-related supply fans which potentially pressurize ECCS equipment areas.
Redundancy of Safety-Related Components (1)
The 36,000 cfm capacity of each filter train equals the maximum design exhaust flow rate from ECCS equipment.areas, (2) The capacity of each high-head fan (l-VS-F-58A and B) is 100 percent.
(3) Install parallel dampers for each of the safeguards and charging pump exhaust systems to provide redundant flow paths to the filters following a LOCA.
(4) Install dampers in series for the other exhaust systems to provide redundant closure following a LOCA, F,
Upgrading Purge E~haust System to Safety Classification Install seismic supports for Units 1 and 2 purge exhaust ducts between the contain-ment purge exhaust isolation valves and the safety-related filters.
G, Filtering Frequently Contaminated Exhaust Air (1) Install a nonsafety-related filter for the treatment of the Auxiliary Building general area exhaust system, (2) Replace all defective diversion dampers with heavy-duty dampers having speci-fied and tested leakage characteristics.
Attachment I Page 1 of i Proposed Status as of Unit 1 Start-up Complete except new nonsafety-related fan (1-VS-F-59) dis-charges to old stack, Complete Incomplete for Auxiliary Building fans Complete for Building.
Not Auxiliary Building Complete Complete Complete Complete 30% Complete Complete Complete Safeguards started in Remarks Fan l-VS-F-59 may be manually tripped from Unit 2 Switchgear Room in the Service Bldg, None Manually interruptible from control room None Manually interruptible from control room None None None None None None None I
H, 3
Restoring Original Design Air Flow Rates of the Auxiliary Building and Purge Exhaust Systems (1) Install a nonsafety-related* high-head fan Cl-VS-F-59), sized to draw the design flow rate of the auxiliary building general area exhaust system through
. the nonsafety-related filter, (2) Install automatic capacity control for fans l-VS-F-58A and B to draw any of the other exhaust systems, including the purge, through the safety-related filters, each at its respective design flow rate, (3) All existing fans will be used only to draw the exhaust systems when bypassing the filters. Remove purge exhaust fans (l-VS-F-5A) and B), since purge air is rarely released without filtration.
Proposed Status as of Unit 1 Start-up Complete Installed Complete Attachment I Pagel of i Remarks None Manual control from control room during construction, Automatic con-trol following final testing and balancing, None
I
_____ _J 5
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ATTACHMENT II Summary of Abbreviations (Page 1)
Outline of Sequential System Modifications (Pages 2 thru 13)
F D
SG RC C
G MOD AOD DMP TD Temp lA Temp lB Temp 2A FJ F
FL BJ
SUMMARY
OF ABBREVIATIONS OUTLINE OF SEQUENTIAL SYSTEM MODIFICATIONS Fuel Building Decon Building Safe Guards Building (Recir. Spray and LHSI Pump House)
Reactor Containment 1 and 2 Central Area Exhaust System (Charging Pump Cubicles)
General Area Exhaust System Motor Operated Damper Air Operated Damper Manual Damper Temporary Duct Attachment II Page 1 of 13 Temporary Damper installed in conjunction with Steam Generator Replacement Project Temporary Damper installed in conjunction with Steam Generator Replacement Project Temporary Damper installed in conjunction with Steam Generator Replacement Project Flanged Joint Fan Filter Blind Joint
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- OTHER MODIFICATIONS NOT SHOWN
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OTHEH MOCI~lCATIONS NOT SHmiN I.Reinforce North Sect. of inlet
& outlet hdr.
2.Modify inlet vane cont. of F-.58A&B
).Modify electric
& pnewnatic con-trols of F,D, SGl and SG2 systems F-9 11 FLANGED JOINT-CLOSED J(
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F*9 Attachment II Page i of 13
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Attachment II Page 1 of 13,
D OTHER MC1DIFJ CA-TIONS N01 SllOWl, I Pf?CX.E.DURE STEP4.-i I 1' 1 *
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OTHER MCi!JlFJ CA-
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PRCcEDURE STEP4.5-.
- OTHER MODIFICATIONS NOT SIIO,!N l.Change Speed*of Fans 1-VS-HV-lA&B 2.Install new e3....,,_,.
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~CORR t0 RAWN BY D. BRECKEN
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PROCEDURE 5TEP4.6
- OTHER MODIFICATIONS NCYf SHO~N 1---..... ~~~
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D Attachment II Page _2-of l.'.!.
OTHER MODIFICATIONS Nar s11mm l.Change temporary control of ADD-109A,B to permanent control PROCEDURE STEP 4.7
- 2.Balance G with,
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OTHER MODIFICA-TIONS NOT SHOWN Attachment II PRCX:EDURE 5TEP4.8..
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.... ----...i!~--~--,i~~ s:3*2 l.Pennanent power for AOD-110 G-F-40(1)
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. I Attaclunent II Page 11.of: 131 OTHER HODlr'ICATIONS NOT SHOWN I.Install controls of AOD-112 PRCCEDURE 5TEf>4.9 G--r
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FLANGED JOINT-OPEN FOR CONSTRUCTION ONLY OUTLINE OF SEOU°ENTIAL SYST t-ODIFICATONS DRAWN BY D. BRECKEN
Attachment II Page 12 c,f :13
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G-J II OTHER NODIFICA-TIONS NOT SHOWN I.Remove old stack flow & radiation monitor nozzle.
FLANGED JOINT-CLOSED J(
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DW 12846.13-BKS-5310
~CORR f\\O DRAWN BY 0. BRECKEN I
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Attachment II Page 13* ~f :l~
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PROCEDURE 5TEP4:11. -'
G--r
>~~~~~~~oiiiiiif~--..... ~~-..--,llt-,--.t ~£:t22.Connect purge F-40(1 A00*110 FL* F-~
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flow element to flow indicator on VNT e
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FOR CONSTRUCTION ONLY OUTL.INE OF 5EOJENTIAL 5YST tvODIFICATONS DRAWN BY D. BRECKEN