ML18139B028

Forwards Response to IE Bulletin 80-24, Prevention of Damage Due to Water Leakage Inside Containment (Oct 17,1980 Indian Point 2 Event). No Leakage in Closed Sys at North Anna 1 & 2.Summary of Leakage at Surry 1 & 2 Encl

ML18139B028
Person / Time
Site:	Surry, North Anna
Issue date:	01/05/1981
From:	Sylvia B VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
950, IEB-80-24, NUDOCS 8101290396
Download: ML18139B028 (9)

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VIRGINIA ELECTRIC AND POWER RJ:CBMOND, VXBGJ:N IA 23261

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4 tJ January 5, 1981 Mr. james P. O'Reilly, Director Serial No. 950 Office*of Inspection and Enforcement NO/RMT:ms U.S. Nuclear Regulatory Commission Docket Nos. 50-338.

Region II 101 Marietta Street; N. W., Suite 310 ~

Atlanta, .Georgia . 30303 ~.

Nos. NPF-4 NPF-7 DPR-32 DPR-37

Dear Mr. O'Reilly:

This is in response to your letter of November 21, 1980 *which forwarded IE Bulletin No. 80-24, "Prevention of-Damage Due to Water Leakage Inside Contain-ment (October 17, _1980 Indian Point 2 Event)". The information requ::i.red by the Bulletin for North Anna Power Station Unit Nos. 1 and 2 and Surry. Power Station Unit Nos. 1 and.2 is attached.

• Very truly yours,.

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B. R. '~lrla Manager "- Nuclear

• Operations and Maintenance Enclosure (3) cc: Director, . NRC, Office of Inspection and Enforcement Washington, D. C. 20555

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COMMONWEALTH OF VIRGINIA .)

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CITY OF RICHMOND )

Before me, a Notary Public, in and for the City and Commonwealth aforesaid, . today personally appeared B. R. Sylvia, who being duly sworn, made oath and said (1) that he is Manager-Nuclear Operations and Maintenance, of the Virginia Electric and Power Company, (2) that he is duly authorized to execute and file the foregoing response in behalf of that Company, and (3) that the statements in the response are true to the best of his knowledge and belief.

Given under my .hand and notarial seal this 5+"'- day o f ~ ,

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Enclosure 1 RESPONSE TO I.E. BULLETIN 80-24 NORTH ANNA UNITS 1 AND 2

1. North Anna Power Station, Units 1 and 2, has no open cooling water systems supplying loads inside the containment which operate during rou-tine operations. The service water system does supply cooling water to the recirculation spray heat exchangers during Containment Depressuriza-tion Actuation (CDA), and it is capable of supplying cooling water to the containment air recirculation fan cooling coils, but such operation is blocked by administrative control. The reactor vessel is located at such an elevation as to provide numerous diversified indications of flooding prior to reaching a level where the vessel would be exposed to external water. (Ref. Fig. 1).

2. Not applicable since there are no open cooling water systems supplying loads inside the containment.

3. Two closed systems supply cooling water to equipment inside the contain-ment, which are the chilled water system and the component cooling water system. There- has been no history* of leakage from the chilled water system, and only minor leakage has been detected from the component cooling system.

Approximately four manhours were expended in preparation of this report.

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• RESPONSE TO IEB-80-24 e

PREVENTION OF DAMAGE DUE TO WATER LEAKAGE INSIDE CONTAINMENT (OCT. 17, 1980 INDIAN POINT 2 EVENT)

Enclosure Page 1 2

HIGHLIGHTS: At Surry, there are no open service water cooled systems within the containment during normal plant operations. The Rx vessel is located at such an elevation as to provide numerous diversified indications of flooding prior to reaching a level where the vessel would be exposed to external water.

SPECIFIC RESPONSE:

1) The service water to the recirculating spray system heat exchangers is the only open cooling water system present inside containment.

a) During normal operation, this system is isolated and drained. This system is automatically unisolated to perform its necessary function.

b) River Water - Chemistry; Typtical pH 7.6 Cl 3500 PPM, Na+ 2400 PPM.

c) Material of piping and coolers: H/X -* 90/10 CuNi 1.5-2.0% Fe Tubes - 90/10 CuNi 1.1-1.5% Fe Piping Stainless Steel RS Carbon Steel - SW NOTE.: The H/X flanged strong-backs use a welded diaphragm for leak~tightness design.

(d) History and type of repairs to coolers and piping systems (Attach-ment 1).

(e) The individual line to and from the containment can be remotely iso-lated from the Control Room and can be manually isolated in the Safeguard's Building, which is external to the containment. In addition, the system valving allows for remote and/or manual isola-tion of two supplying lines should one of the single isolation valves fail. Two operable H/X's remain in service. There is only the one isolated valve on the discharge side of the RS H/X; however, because of this elevation and the normal vacuum on the discharge tunnel, this is adequate for isolation.

2) This section is not applicable due to the fact that there is only an open system during a LOCA condition.

(a) Monthly surveillance to evaluate containment sump level and pumping system are available. Continuous safe operation will be evaluated in the event either the detection or removal systems become inoperable.

3. Summary of experience of cooling water system leakage into containments (January, 1980 -- June, 1980). (Attachment 2).

.. / e Enclosure 2 Page 2 ESTIMATED MANPOWER:

Estimated manpower hours expended in review and preparation of this report:

18 manhours.

ENCLOSURE 2 Page 1 ATTACHMENT i u MR SYS MARKNO

SUMMARY

WKPERF RETSERVDT 1 805281835 SW MOV MOV-SW-106A .,Clean Inspect+Test(Alleyway) Cleaned Inspected+Tested 06/07/78 09/07/7'8 2 903071246 SW Valve MOV-SW-203B Remove And Test Before Cieaning Remove Valve Tested Reinstalled 05/08/79 2 903071247 SW Valve MOV-SW-203A *Remove Ane Test Before Cleaning Tested VAlve 05/08/79 2 903071248 SW Pump MOV-SW-203B Disconnect For Mech+Reconnect Reconnected Test Sat 04/02/79 2 903071249 SW Valve MOV-SW-203A Disconnect For Mech+ Reconnect Connected And Tested sat 04/02/79 1 903090522 SW Pump Coupling Broken Void 06/06/79 2 907090930 SW Valve 2-SW-209 Steam Broken Instailed New Valve 01/07/80 2 907091540 SW Piping 2-SW-207 Repair Drain Line Installed New Valve 09/13/79 2 907130828 SW Valve 2-SW-206 Excessive Leakage On PT 16.4 Repaired Valve 01/26/80 2 907130829 SW Valve 2-SW-208 Excessive Leakage On PT 16.4* Repaired Valve 01/26/80 2 907281400 SW Instr Alarm SW Faulty Alarm SW Repaired 07/30/79

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2 003051240 SW Piping '24-WS-128-10 Expansion Joint Defotmed Void 04/30/80 2 003051412 SW Piping 24-WS-135-10 Remove Expansion Joint Replaced Seats Tested At 45 PSI 07/17/80 2 003051413 SW Piping 24-WS-130-10 Remove Expansion Joint Replaced Seats And Restud At 45 PSI 07/17/80 2 003051414 SW Piping 24-WS-128-10 Remove Expansion Joint Replaced Seats Tested At 45 PSI 07/02/80 2 003051415 SW Piping 24-WS-134-10 Remove Expansion Joint Adjusted Seats Tested At 45 PSI 07/02/80 1 003051416 SW Piping 24-WS-126-10 Remove Expansion Joint Replaced Seats Tested Sat 45 PSI 06/26/80 2 003261004 SW MOV. MOV-SW-205C Packing Leaks 07/28/80 2 004181500 SW Valve MOV-SW-203A Remove And Test For Leakage Replaced Seats+Expansion Joint 05/07/80 2 004181501 SW Valve MOV-203A Remove And Test For Leakage Adjust Limit Switches 05/09/80 2 004301429 SW MOV MOV-SW-203C Disconnect Motor For Mechanics Complete 06/25/80 2 004301906 SW Valve 2-SW-206 Leaks Thru On PT 16.4 Lapped Disc+Seats 05/06/80 2 004301908 SW Aux 2-SW-208 Leak Thru On PT 16,4 Lapped Disc+Seats

• 05/06/80 2 005100948 SW MOV MOV-SW-204D Leaks Thru Mov Clean Dry And Back In Service 05/13/80 2 005101106 SW MOV MOV-SW-205C Leaks Thru 07/28/80 2 005280950 SW Piping 24-WS-135-10 Install New Joint 2 006100900 SW Valve MOV-SW-205A Leaks Through Adjusted Seats Test Sat At 45 PSI Sat 06/26/80 2 006241849 SW Piping 2-SW-67 Bolt Missing Replaced Bolt 06/25/80 2 006241852 SW Valve 2-SW-68 Stem Bent Straightened Stem 06/25/80 2 007301415 SW Valve MOV-SW-205C Cracks In Joints 2 007301416 SW Valve MOV-SW-205D Cracks In Joints 1 009191425, SW HOV Mov-sw..:103A Overhaul 1 009191426 SW MOV MOV-SW-103B Overhaul l 009191427 SW HOV MOV-SW-103C Remove Blank Off Water Supply e 1 2

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009191428 009261135 009261230 011100315 SW SW SW SW MOV Valve Valve Valve Mov.;.sw-103D 2-SW-113 l-SW-113 2-SW-208 Remove Blank Off Water.Supply Check Valve Upstream Of 2-SW-11 Replace Check Valve Water Leak Around Stem Repaired Check Valve Repacked 9/26/80 11/11/80 2 80305,1307 SW Piping 2-SW-176-21B Hole In Pipe Or Leaking joint

ENCLOSURE 2 Page 2 ATTACHMENT 1 2 002061300 SW MOV MOV-SW-205A Does Not Clc;,se Tightly Completed As Per Emp-P-MOV-45 02/19/80 2 002061301 SW MOV MOV-SW-204A Does Not Close Tightly Completed As Per Emp-P-MOV-45 02/19/80 2 020164291 SW PUMP 2-SW-5B Low Disch Press Cleaned Nozzle Inlet Pipe+Nozzle 10/28/77 2 803090838 SW MOV MOV-SW-203A Reseat Cleaned+ Adjusted 03/29/78 2 803090840 SW MOV MOY-SW-203B Reseat Cleaned+ Adjusted 03/29/78 2 803201115 sw* MOV MOV-SW-203A Disconnect For Mech Maintenance Disc Recon Tested 03/29/78 2 803201116 SW MOV MOV-SW-203B Disconnect For,,Mech .Madlntenance :* Disc Reworked LS Gear BX Set+Test 03/29/78 1 805281801 SW MOV MOV-SW-105D Clean I~~pect+Test Cleaned Inspected+Tested 06/05/78 1 805281803 SW MOV MOV-SW-105C Clean Inspect+Test Cleaned Inspected+Tested 06/05/78 1 805281806 SW MOV MOV-SW-105B Clean Inspect+Test Cleaned Inspected+Tested 06/05/78 1 805281807 SW MOV MOV.:.sw-,104D Clean Inspect+Test Cleaned Inspected+Tested 06/05/78 1 805281809 SW MOV* H* 1.MOV-SW-103A Clean Inspect+Test Cleaned Checked.1HCC i 06/15/78 1 805281810 SW MOV MOV-SW-l04C Clean Inspect+Test Cleaned Inspected+Tested 06/05/78 1 805281813 SW MOV

• MOV-SW-104B Clean Inspect+Test Cleaned Inspected+Tested 06/05/78 1 805281816 SW HOV HOV-SW-104A Clean Inspect+Test Cleaned Inspected+Tested 06/05/78 1 805281818 SW MOV HOV-SW-104A Clean Inspect+Test Cleaned+checked MCC 06/15/78 l 805281819 SW HOV HOV-SW-104A Clean Inspect+Test Cleaned+Checked MCC 06/15/78 1 805281820 SW HOV MOV-SW-103C .Clean Inspect+Test Cleaned+checked MCC 00/15/80 e

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ENCLOSURE 2 ATTACHMENT 2 u MR SYS MARKNO

SUMMARY

WKPERF RETSERVDT 2 003050545 cc Valve 2-cc-218 Packing Leak 2 005030959 cc Valve RV-cc-212B Leaks By Dissassembied+Lapped Vlv Seat+Disc 06/23/80 2 006180445 cc Valve 2-cc-242 Check Valve Leaks Tightened Plate Bolts 07/02/80 2 007251340 cc Valve 2-cc-129 Le~k Packing Tightened Packing Gland 07/26/80 1 010121320 - cc Piping l-cc-829 Pipe.To Fe 118 Is Broken Off 2 001171300 cc Valve 2-cc-58 Excessive Leakage On PT 16,3B Completed 02/19/80 2 001171301 cc Valve TV-cc-205B Excessive Leakage On PT 16,3B Completed 02/18/80 2 001171302 cc Valve 2-cc-242 Excessive Leakage On PT 16,3B Repaired 02/17 /80 2 001171303 cc Valve TV-cc-210A Excessive Leakage On PT 16.38 Repaired 02/1'1./80 2 001171304 cc Valve TV-cc-205C Excessive Leakage On PT 16.3B Completed 02/19/80 2 0011-71305 cc Valve 2'-cc-93 Repair Pipe Cap Threads On Valve Repaired Pipe Threads 01/28/80 2 001171306 cc Valve 2-cc-59 Excessive Leaksge On PT 16,JB Completed 02/19/80 1 906201000 cc Piping 1-RH-E-lA Replace cc Outlet Flange Gasket Tightened Flange 06/22/79 e 1 912291545 cc Piping l-cc-100-151 Pine Whole Weld Leak Resoldered Flange 01/04/80 e