ML20044F932

Forwards Response to NRC 930316 Ltr Re Util Response to GL 90-06 Commitments Covering Testing of PORV Control Air Sys Valves & GIs 70 & 94 TS Upgrades.Proposed TS Change Will Be Submitted Re Operation of PORV & Block Valves

ML20044F932
Person / Time
Site:	North Anna
Issue date:	05/21/1993
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-GTECI-070, REF-GTECI-094, REF-GTECI-NI, TASK-070, TASK-094, TASK-70, TASK-94, TASK-OR 93-177, GL-90-06, GL-90-6, NUDOCS 9306010215
Download: ML20044F932 (6)

Text

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. VIRGINIA ELECTRIC AND PowzR COMPANY -

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RICHMOND. VIRGINIA 23201 May 21, 1993  !

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U.S. Nuclear Regulatory Commission Serial No.- 93-177 Attarnon: Document Control Desk NL&P/JBL: <R1 Washington, D.C. 20555 Docket Nos. 50-338 '

50-339  :

License Nos. NPF-4  :

NPF-7  :

a Gentlemen: 1 VIRGINIA ELECTRIC AND POWER COMPANY l NORTH ANNA POWER STATION UNITS 1 AND 2  !

RESPONSE TO NRC LETTER D ATED MARCH 16. 1993 i REVIEW OF GENERIC LETTER 90-06 COMMITMENTS i i

. . 'I' We have received your letter dated March 16,1993 regarding our response to Generic ,

Letter 90-06 for North Anna Power Station. The attachment to this letter provides the.

requested information. .

-t if you have any questions or require additionalinformation, please contact us.

Very truly yours, 1

\', 1

. . tewart 1

i Senior Vice President - Nuclear i Attachment 1 I

cc: U.S. Nuclear Regulatory Commission Region 11 .

101 Marietta Street, N.W. i Suite 2900 1 Atlanta, Georgia 30323  ;

Mr. D. R. Taylor  !

NRC Resident inspector j North Anna Power Station j

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93o6o10215 93o521 ~

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PDR ADOCK-05o00338 'l-l P PDR-

COMMONWEALTH OF VIRGINIA )

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COUNTY OF HENRICO )

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by W. L. Stewart who is Senior Vice President -

Nuclear, of Virginia Electric and Power Company. He is duly authorized to execute and file the foregoing document in behalf of that Company, and the statements in the document are true to the best of his knowledge and belief.

Acknowledged before me this [/Eday of ( du .193$_.

My Commission Expires: ( (iv 3/ ,19 %.

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fkB Y, Nuff  ;

Notary Public P

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(SEAL)

ATTACHMENT '

RESPONSE TO NRC LETTER DATED MARCH 16, 1993 l

REVIEW OF GENERIC LETTER 90-06 COMMITMENTS ,

Your letter of March 16,1993 requested that we resubmit our response to two specific areas of concern for Generic Letter 90-06, " Resolution of Generic issue 70, ' Power-Operated Relief Valve and Block Valve Reliability,' and Generic issue 94, ' Additional Low-Temperature Overpressure Protection for Ught-Water Reactors,' Pursuant to 10 CFR 50.54(f)."

Testina of PORV Control Air System Valves You requested that we commit to testing the control air system valves for the power-operated relief valves for North Anna Units 1 and 2 to assure the capability of the safety backup supply.

Resconse The power-operated relief valves (PORVs) for ]rth Anna Units 1 and 2 can receive either air from the instrument air system, nitr sen from the primary plant gas supply system, or nitrogen from the nitrogen reserve tanks. The nitrogen reserve tanks provide the safety backup supply for the PORVs. The active valves in the nitrogen reserve subsystem are given in Table 1 for North Anna Unit 1 and in Table 2 for North Anna Unit 2. These valves are not classified as /.SME Code Class 1, 2, or 3 components. r The PORV control air system valves listed in Tables 1 and 2 will be tested to assure the capability of the safety backup supply. The valves will be tested by exercising the PORVs with the instrument air system and the primary plant gas supply system isolated and the lines upstream of the isolation check valves vented. This test will

, demonstrate that the valves listed in Tables 1 and 2 will perform their safety functions. t Also, the control air system relief valves listed in the tables will be individually setpoint '

tested to the requirements of the ANSI /ASME Operating and Maintenance (OM)

Standard, Part 1 Requirements for Inservice Performance Testing of Nuclear Power Plant Pressure Relief Devices.

The PORV exercise test with the normal air and nitrogen supplies isolated will be performed every reactor refueling beginning with the first refueling outage for North Anna Power Station that starts after September 1,1993.

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Generic issues 70 and 94 Technical Soecifications Uoarades You requested that, since the North Anna facility is no longer pursuing the MERITS Technical Specifications change, we submit proposed Technical Specifications upgrades consistent with the guidance provided in Generic Letter 90-06 for resolution ,

of Generic issues 70 and 94. ,

Resoonse +

A proposed Technical Specifications change request will be submitted for North Anna Units 1 and 2. This change will, to the extent practical, be consistent with the guidance  ;

provided in Generic Letter 90-06 for operation of the PORVs and block valves in  !

Modes 1,2, and 3 and for low-temperature overpressure protection in Modes 5 and 6. l The proposed Technical Specifications change request will be submitted to the NRC <-

for review and approval no later than March 31,1994.

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Table 1 North Anna Unit 1 Active Valves in the PORV Nitrogen Supply System Required ,

Valve Valve Number Position Descriotion 1-GN-229 Closed These check valves isolate the 1-GN-225 nitrogen reserve system from the normal Si nitrogen system 1-GN-226 Open These check valves open to 1-GN-230 supply the PORVs with normal Si system and reserve nitrogen 1-GN-PCV-125A-1 Partially These pressure control valves 1-GN-PCV-125A-2 Open regulate the flow of nitrogen 1-GN-PCV-125A-3 to the PORVs 1-GN-PCV-125B-1 1-GN-PCV-125B-2 1-GN-PCV-125B-3 1

1-GN-RV-108A-1 Open These relief valves protect 1-GN-RV-108A-2 the nitrogen supply system 1-GN-RV-108A-3 from overpressure events 1-GN-RV-1088-1 1-GN RV-108B-2 1-GN-RV-108B-3 1-IA-2152 Closed These check valves isolate the 1-IA-2153 - nitrogen reserve system from 1-IA-2154 the instrument air system '

1-IA-2155 1-RC-SOV-1455C-1 Open These solenoid valves control 1-RC-SOV-1455C-2 the supply of nitrogen to the 1-RC-SOV-1455C-3 PORV operator 1-RO-SOV-1456-1 1-RC-SOV-1456-2 1-RC-SOV-1456-3 9

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t Table 2 i North Anna Unit 2 ,

Active Valves in the PORV Nitrogen Supply System ,

Required i

- Valve i Valve Number Position Descriotion i i

2-GN-101 Closed These check valves isolate the 2-GN-102 nitrogen reserve system from the  :

normal Si nitrogen system - .

2-GN-115 Open These check valves open to _

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2-GN-116 supply the PORVs with normal SI system and reserve nitrogen ,

2-GN-PCV-225A-1 Partially These pressure control valves 2-GN-PCV-225A-2 Open regulate the flow of nitrogen l 2-GN-PCV-225A-3 to the PORVs -;

2-GN-PCV-225B-1  ::

2-GN-PCV-225B-2 i 2-GN-PCV-2258-3 ,;

2-GN-RV-208A-1 Opon These relief valves protect .;

2-GN-RV-208A-2 the nitrogen supply system -

2-GN-RV-208A-3 from overpressure events j 2-GN-RV-2088-1  !

2-GN-RV-2088-2 .

2-GN-RV-2088-3 ,

2-IA-2130 Closed These check valves isolate the 't 2-IA-2131 - nitrogen reserve system from j 2-IA-2132 the instrument air system 1 2-IA-2133 j 2-RC-SOV-2455C-1 Open These solenoid valves control '

2-RC-SOV-2455C-2 the supply of nitrogen to the 2-RC-SOV-2455C-3 PORV operator  !

2-RC-SOV-2456-1 ,

2-RC-SOV-2456-2  !

2-RC-SOV-2456-3 i 1

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