ML20205T558

Annual Operating Rept for 1986,consisting of Summary of Procedure Changes & Special Tests

ML20205T558
Person / Time
Site:	North Anna
Issue date:	04/01/1987
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8704070321
Download: ML20205T558 (7)

Text

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VINGINIA ELucTHIC AND POWER COMi%NY Hicuxoxu,Vinoisir etter,I W.L. STEWART Vacs Pmastommt xectain o,. na== April 1, 1987 United States Nuclear Regulatory Commission Serial No.87-117 Attention: Document Control Desk N0/JHL:jmj Washington, D.C. 20555 Docket Nos. 50-338 50-339 License Nos. NPF-4 NPF-7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY j NORTH ANNA POWER STATION UNITS 1 AND 2 SUB9tARY OF PROCEDURE CHANGES AND TESTS PURSUANT TO 10 CFR 50.59 Enclosed is a summary of procedure changes and special tests carried out in 1986 pursuant to 10 CFR 50.59 for North Anna Units 1 and 2, including a summary of the safety evaluation of each.

Very truly yours, I

ke %s W. L. Stewart Attachments 870407 O[$ob330 g

PDR A PDR i

cc: U. S. Nuclear Regulatory Cocutission 101 Marietta Street, N.W.

Suite 2900 Atlanta, GA 30323 ,

1 Mr. J. L. Caldwell NRC Senior Resident Inspector North Anna Power Station l

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PROCEDURES REQUIRING A SAFETY EVALUATION DURING 1986 EMP-C-BY-2.1: Battery Cell Charging In Groups of 15 or Less SNSOC approved safety evaluation: 4/23/86

Description:

The purpose of this procedure was to allow the capability of charging battery cells in groups of 15 or less.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created.

The margin of safety as described in the bases section of any part of the technical specifications was not reduced. The procedure was to allow the new station batteries to receive a freshening charge in accordance with the vendor manual. The battery cells vers to receive a freshening charge in groups of 15 or less in order to obtain battery operability.

SPECIAL TESTS COMPLETED IN 1986 NORTH ANNA POWER STATION 1-ST-1: Steam Generator Moisture Carryover Test SNSOC approved test: 7/24/86 ; 11/13/86 SNSOC approved test results: Unit 1 - 7/24/86 ; 11/13/86 ; 11/26/86 Unit 2 - 7/24/86 ; 11/26/86

Description:

This test measured the effectiveness of the steam generators by quantifying the amount of moisture that is carried with the steam into the turbines.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was

. not increased since review has shown no interface with systems involved with reactor safety. The possibility of a different' type of accident or malfunction than was previously evaluated in the safety analysis report was not created since plant operation is not affected by adding Sodium-24 (half life 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br />) and taking recondary samples for analysis. The margin of safety as described in the bases section of any part of the technical specifications was not reduced since review has shown no interface with systems involved with reactor i safety and plant operation is not affected by adding Sodium-24 and taking secondary samples for analysis.

1 1-ST-67: Control Room Bottled Air Special Test 1

i SNSOC approved test: 1/31/86 SNSOC approved test results: 4/10/86 i

Description:

The test verified that the control room bottled air system can deliver 340 cfm to the control room and maintain the control room at an average positive

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pressure greater than or equal to 0.05 inches of water for one hour.

2 Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased since a review of the UFSAR indicated that the accident analyses remained bounding for this test. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created since a review of the UFSAR indicated that the accident analyses remained bounding for this test. The margin of safety as described in l the bases section of any pert of the technical specifications was not reduced.

l The requirements of Techniaal Specification 4.7.7.2b were met.

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1-ST-69: Determination of the EDG Load Limiter 3000kw Setpoint SNSOC approved test: 12/4/86 SNSOC approved test results: 12/18/86 ; 1/15/87

Description:

This test identified the point at which the load limiter on a diesel generator should be set in order to limit the electrical output of the diesel to less than or equal to 3000kw. This test was performed on one Unit I diesel and one Unit 2 diesel in December of 1986.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created.

The margin of safety as described in the bases section of any part of the technical specifications was not reduced. The ability of the diesel generators to perform as described in the UFSAR was not affected. The test only marked a spot on the limiter. A physical stop was not installed.

1-ST-70/2-ST-51: Tavg Reduction at Core Uprated Power SNSOC approved test: 11/13/86 ; 12/4/86 SNSOC approved test results: Unit 1 & 2: 12/4/86

Description:

This test reduced RCS Tavg by 10*F, and monitored the effects of the change.

The test was performed to gather data to be used in evaluating the feasibility of permanently reducing Tavg in order to reduce stress corrosion cracking problems in the steam generators.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased. The test conditions created only incremental changes in the values of parameters previously known to be significant in determining core response to known accidents. The predicted values of parameters are within the range of existing safety analysis values. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created since the test involved no system changes and the predicted values of parameters are within the range of the existing safety analysis. The margin of safety as described in the bases section of any part of the technical specifications was not reduced. The analyses demonstrated that the calculated results met the acceptance criteria described in the UFSAR.

1-ST-71: Control Room HVAC Test SNSOC approved test: 12/4/86 SNSOC approved test results: 12/4/86

Description:

This test was performed to collect flow balance data on the control room ventilation system.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased. The ability of the control room ventilation system to perform as required in the event of a safety injection signal was not affected. The operation of the system was not affected by obtaining flow data. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created. System operation was performed in accordance with the UFSAR. The margin of safety as described in the bases section of any part of the technical specifications was not reduced.

The ability of the control room ventilation system to perform as required in the event of a safety injection signal was not affected. The operation of the system was not affected by obtaining flow data. System operation was performed in accordance with the UFSAR.

2-ST-48: Large Bore Snubber Accumulator System Troubleshooting SNSOC approved test: 2/25/86

, SNSOC approved test results: 4/10/86 (twice)

Description:

This test was performed to document the inspection of the reservoirs and associated piping of large bore snubbers. The snubbers inspected were in the "B" and "C" steam generator cubicles on Unit 2.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created.

The test van used to observe the reservoirs of certain large bore snubbers.

The system was returned to its original condition following the test. The margin of safety as described in the bases section of any part of the technical specifications was not reduced. The test did not affect technical specification operability.

A 2-ST-49: 2H Diesel Extended Run SNSOC approved test: 3/20/86 SNSOC approved test results: 2/26/87

Description:

This test was performed on the 2H Emergency Diesel Generator. Its purpose was to monitor the diesels performance during a run over an extended period of time (approximately 130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br />). The test also provided instructions for determining the setpoint for the load limiter which corresponds to a load of 3000kw. The test was performed in March, 1986.

Description of the Safety Evaluation:

The probability of occurrence or the consequences of a malfunction of equipment important to safety and previously evaluated in the safety analysis report was not increased. The diesel generator remained fully capable of performing its function during undervoltage conditions, station blackout or safety injection initiation. The possibility of a different type of accident or malfunction than was previously evaluated in the safety analysis report was not created.

Adequate offsite power supplies remained available and the diesel generator was still capable of performing its intended function during the test. The margin of safety as described in the bases section of any part of the technical specifications was not reduced. The diesel generator remained operable during the test.